/* =========================================================
   LỘ TRÌNH 90 NGÀY — Design system
   ========================================================= */
:root {
  --bg: #0b1220;
  --bg-2: #101a2e;
  --panel: #18233b;
  --panel-2: #22304d;
  --panel-solid: #18233b;
  --border: #31415f;
  --border-2: #475a7d;
  --text: #eef2fb;
  --muted: #b4bfd6;
  --dim: #8793ad;

  --accent: #9b8cff;
  --accent-2: #45d4f5;
  --grad: linear-gradient(135deg, #9b8cff 0%, #6aa8ff 50%, #45d4f5 100%);
  --grad-soft: linear-gradient(135deg, rgba(155, 140, 255, .22), rgba(69, 212, 245, .14));

  --ok: #4ade80;
  --ok-bg: rgba(74, 222, 128, 0.16);
  --bad: #fb7185;
  --bad-bg: rgba(251, 113, 133, 0.16);
  --warn: #fbbf24;
  --warn-bg: rgba(251, 191, 36, 0.16);

  --pc: var(--accent);
  --radius: 20px;
  --radius-sm: 12px;
  --shadow: 0 16px 40px -18px rgba(0, 0, 0, 0.5);
  --font: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* =========================================================
   LIGHT THEME DESIGN SYSTEM (Sáng sủa, sạch sẽ, bảo vệ mắt)
   ========================================================= */
:root[data-theme="light"],
html[data-theme="light"] {
  --bg: #f4f6fc;
  --bg-2: #ffffff;
  --panel: #ffffff;
  --panel-2: #f8fafc;
  --panel-solid: #ffffff;
  --border: #e2e8f0;
  --border-2: #cbd5e1;
  --text: #0f172a;
  --muted: #475569;
  --dim: #64748b;

  --accent: #4f46e5;
  --accent-2: #0284c7;
  --grad: linear-gradient(135deg, #4f46e5 0%, #2563eb 50%, #0284c7 100%);
  --grad-soft: linear-gradient(135deg, rgba(79, 70, 229, .10), rgba(2, 132, 199, .06));

  --ok: #059669;
  --ok-bg: rgba(5, 150, 105, 0.10);
  --bad: #e11d48;
  --bad-bg: rgba(225, 29, 72, 0.10);
  --warn: #d97706;
  --warn-bg: rgba(217, 119, 6, 0.10);

  --shadow: 0 10px 30px -10px rgba(15, 23, 42, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.04);
}

[data-theme="light"] body::before {
  background-image: radial-gradient(rgba(100, 116, 139, .16) 1px, transparent 1px);
  mask-image: none;
  opacity: 0.7;
}
[data-theme="light"] .bg-blobs span {
  opacity: .12;
  filter: blur(120px);
}
[data-theme="light"] .sidebar {
  background: rgba(255, 255, 255, 0.94);
  border-right: 1px solid #e2e8f0;
  box-shadow: 4px 0 24px rgba(15, 23, 42, 0.03);
}
[data-theme="light"] .topbar {
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid #e2e8f0;
}
[data-theme="light"] .tabs {
  background: rgba(255, 255, 255, 0.96);
  border-color: #e2e8f0;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}
[data-theme="light"] .tab {
  color: #475569;
}
[data-theme="light"] .tab:hover {
  background: #f1f5f9;
  color: #0f172a;
}
[data-theme="light"] .tab.active {
  background: #eef2ff;
  color: #4338ca;
  box-shadow: inset 0 0 0 1px #c7d2fe;
}
[data-theme="light"] .hero {
  background: linear-gradient(135deg, #eef2ff 0%, #e0f2fe 55%, #fdf2f8 100%);
  border-color: #cbd5e1;
  box-shadow: 0 10px 30px -10px rgba(79, 70, 229, 0.1);
}
[data-theme="light"] .hero h1 {
  color: #0f172a;
}
[data-theme="light"] .ring-bg {
  stroke: #e2e8f0;
}
[data-theme="light"] .bar {
  background: #e2e8f0;
}
[data-theme="light"] .chip {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #334155;
}
[data-theme="light"] .say {
  background: #e0f2fe;
  color: #0284c7;
  border-color: #bae6fd;
}
[data-theme="light"] .say:hover {
  background: #bae6fd;
}
[data-theme="light"] .face.front {
  background: linear-gradient(145deg, #ffffff 30%, #f0f4ff 100%);
  color: #0f172a;
  border: 1.5px solid #c7d2fe;
  box-shadow: 0 20px 40px -15px rgba(79, 70, 229, 0.16);
}
[data-theme="light"] .face.back {
  background: linear-gradient(145deg, #ffffff 30%, #f0fdf4 100%);
  color: #0f172a;
  border: 1.5px solid #bbf7d0;
  box-shadow: 0 20px 40px -15px rgba(5, 150, 105, 0.16);
}
[data-theme="light"] .lesson-body table {
  border-color: #e2e8f0;
}
[data-theme="light"] .lesson-body th {
  background: #f1f5f9;
  color: #0f172a;
  border-color: #cbd5e1;
}
[data-theme="light"] .lesson-body td {
  border-color: #e2e8f0;
  color: #1e293b;
}
[data-theme="light"] .lesson-body tr:nth-child(even) td {
  background: #f8fafc;
}
[data-theme="light"] .rule-box {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: #0f172a;
}
[data-theme="light"] .rule-box.formula {
  background: #f1f5f9;
  color: #0f172a;
  border-color: #cbd5e1;
}
[data-theme="light"] .box-bad, [data-theme="light"] .callout.warn {
  background: #fff1f2;
  border-color: #fecdd3;
  color: #9f1239;
}
[data-theme="light"] .box-ok, [data-theme="light"] .callout.tip {
  background: #f0fdf4;
  border-color: #bbf7d0;
  color: #166534;
}
[data-theme="light"] .callout.note {
  background: #f0f9ff;
  border-color: #bae6fd;
  color: #0369a1;
}
[data-theme="light"] .vrow {
  background: #ffffff;
  border-color: #e2e8f0;
}
[data-theme="light"] .vrow:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}
[data-theme="light"] .srs-box {
  background: #ffffff;
  border-color: #e2e8f0;
}
[data-theme="light"] .ex-item {
  background: #f8fafc;
  border-color: #e2e8f0;
}
[data-theme="light"] .choice-btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #1e293b;
}
[data-theme="light"] .choice-btn:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
}
[data-theme="light"] .blank {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}
[data-theme="light"] .token {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #1e293b;
}
[data-theme="light"] .dropzone {
  background: #f1f5f9;
  border-color: #cbd5e1;
}
[data-theme="light"] .btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #1e293b;
}
[data-theme="light"] .btn:hover {
  background: #f1f5f9;
}
[data-theme="light"] .btn-primary {
  background: var(--grad);
  border-color: transparent;
  color: #ffffff;
}
[data-theme="light"] .btn-primary:hover {
  background: var(--grad);
  filter: brightness(1.05);
}
[data-theme="light"] .btn-ok {
  background: var(--ok-bg);
  border-color: rgba(5, 150, 105, .4);
  color: var(--ok);
}
[data-theme="light"] .btn-bad {
  background: var(--bad-bg);
  border-color: rgba(225, 29, 72, .4);
  color: var(--bad);
}
[data-theme="light"] .chip-pc {
  background: #eef2ff;
  border-color: #c7d2fe;
  color: var(--accent);
}
[data-theme="light"] .btn-ghost {
  background: transparent;
  color: var(--muted);
}
[data-theme="light"] .toast {
  background: #ffffff;
  color: #0f172a;
  border-color: #cbd5e1;
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.14);
}
[data-theme="light"] .day {
  background: #ffffff;
  border-color: #e2e8f0;
}
[data-theme="light"] .day.done {
  background: linear-gradient(135deg, #f0fdf4, #ffffff);
  border-color: #86efac;
}
[data-theme="light"] .wcard {
  background: #ffffff;
  border-color: #e2e8f0;
  box-shadow: 0 2px 8px rgba(0,0,0,.03);
}
[data-theme="light"] .stat {
  background: #ffffff;
  border-color: #e2e8f0;
}
[data-theme="light"] .task-list li a, [data-theme="light"] .task-list li > span {
  background: #f8fafc;
  border-color: #e2e8f0;
  color: #1e293b;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image: radial-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 75%);
}
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
input, textarea, select { font: inherit; color: inherit; }
::selection { background: rgba(139, 123, 255, .45); }
.ic { width: 1.15em; height: 1.15em; flex-shrink: 0; vertical-align: -0.2em; }
.hidden { display: none !important; }
.muted { color: var(--muted); }

/* ---------- Background ---------- */
.bg-blobs { position: fixed; inset: 0; z-index: -2; overflow: hidden; pointer-events: none; }
.bg-blobs span { position: absolute; border-radius: 50%; filter: blur(110px); opacity: .18; animation: float 24s ease-in-out infinite; }
.bg-blobs span:nth-child(1) { width: 560px; height: 560px; background: #6d5dfc; top: -200px; left: 12%; }
.bg-blobs span:nth-child(2) { width: 480px; height: 480px; background: #0ea5c6; bottom: -200px; right: -100px; animation-delay: -8s; }
.bg-blobs span:nth-child(3) { width: 400px; height: 400px; background: #c026d3; top: 42%; left: 48%; opacity: .16; animation-delay: -16s; }
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(50px, -40px) scale(1.08); }
  66% { transform: translate(-40px, 40px) scale(.94); }
}

/* ---------- Layout ---------- */
.overlay { display: none; }
.layout {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  min-height: 100vh;
  width: 100%;
}
.sidebar {
  grid-column: 1;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 22px 14px 30px;
  border-right: 1px solid var(--border);
  background: var(--bg-2);
  backdrop-filter: blur(20px);
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,.1) transparent;
}
.main {
  grid-column: 2;
  min-width: 0;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 36px clamp(16px, 4vw, 52px) 90px;
}
.main.enter { animation: fadeUp .5s var(--ease); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }

.topbar { display: none; }
.brand { display: flex; align-items: center; gap: 12px; padding: 6px 10px 22px; }
.logo {
  display: grid; place-items: center; width: 42px; height: 42px; border-radius: 13px;
  background: var(--grad); color: #fff; font-weight: 800; font-size: 17px; letter-spacing: -.5px;
  box-shadow: 0 8px 24px -6px rgba(139, 123, 255, .7);
}
.brand-t b { display: block; font-size: 15.5px; letter-spacing: -.2px; }
.brand-t small { color: var(--muted); font-size: 12px; }

.nav { display: grid; gap: 4px; margin-bottom: 18px; }
.nav-link {
  display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 12px;
  color: var(--muted); font-weight: 500; font-size: 14.5px; transition: all .2s;
}
.nav-link:hover { background: var(--panel); color: var(--text); }
.nav-link.active { background: var(--grad-soft); color: var(--text); box-shadow: inset 0 0 0 1px rgba(139, 123, 255, .3); }
.badge {
  margin-left: auto; min-width: 22px; height: 22px; padding: 0 7px; border-radius: 99px;
  background: var(--bad); color: #fff; font-size: 11.5px; font-weight: 700; display: grid; place-items: center;
  animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(251,113,133,.5); } 50% { box-shadow: 0 0 0 6px rgba(251,113,133,0); } }

.nav-phase { margin-top: 14px; }
.nav-phase-t {
  display: flex; align-items: center; gap: 8px; padding: 6px 12px; font-size: 11.5px;
  text-transform: uppercase; letter-spacing: .08em; color: var(--dim); font-weight: 700;
}
.nav-phase-t i { width: 7px; height: 7px; border-radius: 50%; background: var(--pc); box-shadow: 0 0 10px var(--pc); }
.nav-week {
  display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: 11px;
  font-size: 13.5px; color: var(--muted); transition: all .2s;
}
.nav-week:hover { background: var(--panel); color: var(--text); }
.nav-week.active { background: var(--panel-2); color: var(--text); box-shadow: inset 3px 0 0 var(--pc); }
.nw-n {
  width: 24px; height: 24px; border-radius: 8px; display: grid; place-items: center; flex-shrink: 0;
  background: rgba(255,255,255,.06); font-size: 12px; font-weight: 700;
}
.nav-week.done .nw-n { background: var(--pc); color: #fff; }
.nw-t { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nw-p {
  width: 16px; height: 16px; border-radius: 50%; flex-shrink: 0;
  background: conic-gradient(var(--pc) calc(var(--p) * 1%), rgba(255,255,255,.1) 0);
  -webkit-mask: radial-gradient(circle, transparent 4px, #000 4.5px);
          mask: radial-gradient(circle, transparent 4px, #000 4.5px);
}
.side-foot { margin-top: 26px; padding: 12px; font-size: 12px; color: var(--dim); text-align: center; border-top: 1px solid var(--border); }

/* ---------- Typography & atoms ---------- */
h1 { font-size: clamp(28px, 4vw, 46px); line-height: 1.12; letter-spacing: -1.2px; font-weight: 800; }
h2 { font-size: 22px; letter-spacing: -.4px; line-height: 1.3; }
h3 { font-size: 17px; letter-spacing: -.2px; line-height: 1.35; }
.lead { color: var(--muted); font-size: 16.5px; max-width: 640px; }
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 99px;
  background: var(--panel); border: 1px solid var(--border); font-size: 13px; color: var(--muted); font-weight: 500;
}
.section-title { display: flex; align-items: center; gap: 10px; margin: 44px 0 18px; font-size: 24px; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}
.card-title { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; font-size: 18px; }

.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; border-radius: 99px;
  font-size: 12.5px; font-weight: 600; background: rgba(255,255,255,.06); border: 1px solid var(--border); color: var(--muted);
}
.chip-pc { color: var(--pc); background: color-mix(in srgb, var(--pc) 14%, transparent); border-color: color-mix(in srgb, var(--pc) 35%, transparent); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: 12px; font-weight: 600; font-size: 14.5px;
  border: 1px solid var(--border-2); background: var(--panel); transition: all .2s var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); background: var(--panel-2); }
.btn:active { transform: translateY(0) scale(.98); }
.btn-primary { background: var(--grad); color: #fff; border-color: transparent; box-shadow: 0 10px 30px -10px rgba(139,123,255,.8); }
.btn-primary:hover { background: var(--grad); box-shadow: 0 14px 34px -10px rgba(95,168,255,.9); filter: brightness(1.06); }
.btn-ghost { background: transparent; }
.btn-ok { background: var(--ok-bg); color: var(--ok); border-color: rgba(52,211,153,.4); }
.btn-bad { background: var(--bad-bg); color: var(--bad); border-color: rgba(251,113,133,.4); }
.btn-warn { background: var(--warn-bg) !important; color: var(--warn) !important; border-color: rgba(251,191,36,.5) !important; box-shadow: none !important; }
.btn-lg { padding: 14px 24px; font-size: 15.5px; border-radius: 14px; }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 10px; }
.link-btn { color: var(--accent-2); font-size: 13.5px; font-weight: 600; padding: 4px 0; }
.link-btn:hover { text-decoration: underline; }

.bar { height: 7px; border-radius: 99px; background: rgba(255,255,255,.07); overflow: hidden; }
.bar i { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--pc), color-mix(in srgb, var(--pc) 60%, #fff)); transition: width .8s var(--ease); }

.say {
  display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; flex-shrink: 0;
  background: rgba(61,214,245,.1); color: var(--accent-2); border: 1px solid rgba(61,214,245,.25); transition: all .2s;
}
.say:hover { background: rgba(61,214,245,.2); transform: scale(1.08); }
.say-lg { width: 50px; height: 50px; border-radius: 15px; }
.say-lg .ic { width: 22px; height: 22px; }

/* ---------- Ring ---------- */
.ring-wrap { position: relative; display: inline-grid; place-items: center; }
.ring { transform: rotate(-90deg); }
.ring circle { fill: none; }
.ring-bg { stroke: rgba(255,255,255,.08); }
.ring-fg { stroke-linecap: round; transition: stroke-dashoffset 1s var(--ease); }
.ring-txt { position: absolute; font-weight: 800; font-size: 17px; letter-spacing: -.5px; }
.ring-wrap.big .ring-txt { font-size: 34px; }

/* ---------- Hero ---------- */
.hero {
  position: relative; display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center;
  padding: 44px; border-radius: 28px; overflow: hidden;
  background: linear-gradient(135deg, rgba(139,123,255,.16), rgba(61,214,245,.06) 60%, rgba(244,114,182,.08));
  border: 1px solid var(--border-2);
}
.hero::after {
  content: ""; position: absolute; width: 380px; height: 380px; right: -120px; top: -140px; border-radius: 50%;
  background: radial-gradient(circle, rgba(61,214,245,.25), transparent 70%); pointer-events: none;
}
.hero-text { display: grid; gap: 18px; position: relative; z-index: 1; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 6px; }
.hero-ring { text-align: center; position: relative; z-index: 1; }
.hero-ring-label { margin-top: 8px; color: var(--muted); font-size: 13.5px; font-weight: 500; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 20px; }
.stat {
  display: flex; align-items: center; gap: 14px; padding: 18px 20px; border-radius: 18px;
  background: var(--panel); border: 1px solid var(--border); transition: transform .25s var(--ease), border-color .25s;
}
.stat:hover { transform: translateY(-3px); border-color: var(--border-2); }
.stat-ic { width: 44px; height: 44px; border-radius: 13px; display: grid; place-items: center; background: var(--c-bg); color: var(--c); }
.stat-ic .ic { width: 22px; height: 22px; }
.stat b { display: block; font-size: 24px; line-height: 1.1; letter-spacing: -.5px; }
.stat small { color: var(--muted); font-size: 12.5px; }

.grid-2 { display: grid; grid-template-columns: 1.4fr 1fr; gap: 18px; margin-top: 18px; }
.today-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 14px; }
.today-head .crumb { margin-bottom: 4px; }
.task-list { display: grid; gap: 8px; list-style: none; }
.task-list li a, .task-list li > span {
  display: flex; align-items: center; gap: 12px; padding: 11px 14px; border-radius: 12px;
  background: rgba(255,255,255,.03); border: 1px solid var(--border); transition: all .2s; font-size: 14.5px;
}
.task-list li a:hover { border-color: color-mix(in srgb, var(--pc) 50%, transparent); background: color-mix(in srgb, var(--pc) 8%, transparent); transform: translateX(4px); }
.t-min {
  flex-shrink: 0; min-width: 44px; text-align: center; padding: 2px 8px; border-radius: 8px;
  font-size: 12px; font-weight: 700; color: var(--pc); background: color-mix(in srgb, var(--pc) 14%, transparent);
}
.tip-card { position: relative; overflow: hidden; }
.tip-card .quote { font-size: 17px; font-weight: 500; line-height: 1.6; margin: 10px 0 18px; }
.tip-card .quote::before { content: "“"; display: block; font-size: 60px; line-height: .6; color: var(--accent); font-family: Georgia, serif; margin-bottom: 6px; }
.review-cta { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 16px; border-radius: 14px; background: rgba(251,113,133,.08); border: 1px solid rgba(251,113,133,.25); }

/* ---------- Phases ---------- */
.phases { display: grid; gap: 22px; }
.phase {
  display: grid; grid-template-columns: 270px 1fr; gap: 22px; padding: 22px; border-radius: 24px;
  background: var(--panel); border: 1px solid var(--border); position: relative; overflow: hidden;
}
.phase::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--pc); box-shadow: 0 0 24px var(--pc); }
.phase-head { display: grid; gap: 8px; align-content: start; }
.phase-month { font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; color: var(--pc); }
.phase-head h3 { font-size: 21px; }
.phase-head p { color: var(--muted); font-size: 13.5px; }
.phase-weeks { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.wcard {
  display: flex; flex-direction: column; gap: 8px; padding: 16px; border-radius: 16px;
  background: rgba(255,255,255,.03); border: 1px solid var(--border); transition: all .25s var(--ease);
}
.wcard:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--pc) 55%, transparent); background: color-mix(in srgb, var(--pc) 7%, transparent); box-shadow: 0 16px 30px -18px var(--pc); }
.wcard-top { display: flex; justify-content: space-between; font-size: 12px; font-weight: 700; color: var(--pc); }
.wcard h4 { font-size: 14.5px; line-height: 1.35; }
.wcard p { font-size: 12.5px; color: var(--muted); flex: 1; }

/* ---------- Week page ---------- */
.week-head { display: flex; justify-content: space-between; gap: 24px; align-items: center; position: relative; overflow: hidden; }
.week-head::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(600px 200px at 0% 0%, color-mix(in srgb, var(--pc) 18%, transparent), transparent 70%);
}
.week-head > * { position: relative; }
.week-head h1 { font-size: clamp(24px, 3.2vw, 36px); margin: 6px 0 10px; }
.week-head .lead { margin-bottom: 14px; }
.crumb { font-size: 12.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--pc); }
.wk-badge { display: inline-block; padding: 2px 12px; margin-right: 6px; border-radius: 10px; font-size: .6em; vertical-align: middle; background: var(--pc); color: #fff; letter-spacing: 0; }

.tabs {
  position: sticky; top: 12px; z-index: 20; display: flex; gap: 4px; padding: 6px; margin: 20px 0;
  border-radius: 16px; background: rgba(24, 35, 59, 0.92); backdrop-filter: blur(16px);
  border: 1px solid var(--border); overflow-x: auto; scrollbar-width: none;
}
.tab {
  display: flex; align-items: center; gap: 8px; padding: 10px 16px; border-radius: 11px; white-space: nowrap;
  color: var(--muted); font-weight: 600; font-size: 14px; transition: all .2s; flex: 1; justify-content: center;
}
.tab:hover { color: var(--text); background: var(--panel); }
.tab.active { background: color-mix(in srgb, var(--pc) 18%, transparent); color: var(--text); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--pc) 45%, transparent); }
.tab.active .ic { color: var(--pc); }
.week-nav { display: flex; justify-content: space-between; margin-top: 36px; }

.grid-plan { display: grid; grid-template-columns: 340px 1fr; gap: 18px; align-items: start; }
.grid-plan > .card { position: sticky; top: 90px; }
.goals { list-style: none; display: grid; gap: 10px; margin-bottom: 18px; }
.goals li { display: flex; gap: 10px; font-size: 14.5px; }
.goals .ic { color: var(--pc); margin-top: 3px; }
.days { display: grid; gap: 14px; }
.day {
  padding: 20px; border-radius: 18px; background: var(--panel); border: 1px solid var(--border);
  transition: all .25s var(--ease);
}
.day:hover { border-color: var(--border-2); }
.day.done { border-color: rgba(52,211,153,.35); background: linear-gradient(135deg, rgba(52,211,153,.07), transparent 60%); }
.day header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.day-n { padding: 4px 11px; border-radius: 9px; font-size: 12px; font-weight: 800; background: color-mix(in srgb, var(--pc) 16%, transparent); color: var(--pc); }
.day.done .day-n { background: var(--ok); color: #fff; }
.day h3 { flex: 1; font-size: 16px; }
.day-min { font-size: 12.5px; color: var(--dim); font-weight: 600; }
.day .task-list { margin-bottom: 14px; }
.day-rest { opacity: .75; border-style: dashed; }
.day-rest p { color: var(--muted); font-size: 14px; margin-top: 6px; }

/* ---------- Lesson content ---------- */
.lesson { margin-bottom: 18px; }
.lesson-head { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.lesson-n {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; flex-shrink: 0;
  background: var(--pc); color: #fff; font-weight: 800; font-size: 17px; box-shadow: 0 8px 20px -8px var(--pc);
}
.lesson-body { display: grid; gap: 14px; font-size: 15.5px; }
.lesson-body p, .lesson-body li { color: var(--text); }
.lesson-body b { color: var(--text); font-weight: 700; }
.lesson-body h4 { font-size: 15.5px; color: var(--pc); margin-top: 6px; }
.lesson-body ul, .lesson-body ol { padding-left: 22px; display: grid; gap: 6px; }
.lesson-body table { width: 100%; border-collapse: separate; border-spacing: 0; border-radius: 14px; overflow: hidden; border: 1px solid var(--border); font-size: 14.5px; }
.lesson-body th { background: color-mix(in srgb, var(--pc) 14%, transparent); text-align: left; padding: 10px 14px; font-weight: 700; color: #fff; font-size: 13.5px; }
.lesson-body td { padding: 9px 14px; border-top: 1px solid var(--border); }
.lesson-body tr:nth-child(even) td { background: rgba(255,255,255,.02); }
.table-wrap { overflow-x: auto; }
.formula {
  padding: 13px 18px; border-radius: 12px; font-weight: 600; font-size: 15px;
  background: rgba(139,123,255,.09); border: 1px solid rgba(139,123,255,.28); border-left: 4px solid var(--accent);
  font-family: ui-monospace, 'SF Mono', Menlo, monospace; letter-spacing: -.2px;
}
.lesson-body ul.ex { list-style: none; padding: 0; gap: 8px; }
.lesson-body ul.ex li {
  display: flex; align-items: center; gap: 12px; padding: 10px 14px; border-radius: 12px;
  background: rgba(255,255,255,.03); border: 1px solid var(--border);
}
.lesson-body ul.ex li .ex-txt { flex: 1; }
.lesson-body ul.ex li i { display: block; color: var(--muted); font-size: 13.5px; font-style: normal; }
.lesson-body ul.ex .say { width: 30px; height: 30px; border-radius: 9px; }
.callout { padding: 14px 18px; border-radius: 14px; font-size: 14.5px; line-height: 1.7; }
.callout b:first-child { display: inline-block; margin-bottom: 2px; }
.callout.warn { background: var(--bad-bg); border: 1px solid rgba(251,113,133,.28); }
.callout.warn b:first-child { color: var(--bad); }
.callout.tip { background: var(--ok-bg); border: 1px solid rgba(52,211,153,.28); }
.callout.tip b:first-child { color: var(--ok); }
.callout.note { background: rgba(61,214,245,.08); border: 1px solid rgba(61,214,245,.25); }
.callout.note b:first-child { color: var(--accent-2); }
.lesson-end { display: flex; justify-content: center; margin-top: 10px; }

/* ---------- Segmented ---------- */
.seg { display: inline-flex; flex-wrap: wrap; gap: 4px; padding: 5px; border-radius: 14px; background: var(--panel); border: 1px solid var(--border); margin-bottom: 18px; }
.seg-btn { padding: 8px 16px; border-radius: 10px; font-size: 14px; font-weight: 600; color: var(--muted); transition: all .2s; }
.seg-btn:hover { color: var(--text); }
.seg-btn.active { background: var(--grad); color: #fff; }

/* ---------- Vocabulary ---------- */
.vtop { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.vgroup { margin-bottom: 18px; }
.vg-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.vg-head h3 { font-size: 18px; }
.vg-head .grow { flex: 1; }
.vgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 12px; }
.vitem {
  display: flex; gap: 12px; padding: 14px; border-radius: 15px;
  background: rgba(255,255,255,.03); border: 1px solid var(--border); transition: all .2s var(--ease);
}
.vitem:hover { border-color: color-mix(in srgb, var(--pc) 45%, transparent); transform: translateY(-2px); }
.vmain { min-width: 0; }
.vword { font-weight: 700; font-size: 16.5px; }
.vpos { font-size: 11.5px; font-weight: 600; color: var(--pc); margin-left: 4px; font-style: italic; }
.vipa { color: var(--accent-2); font-size: 13.5px; font-family: 'Lucida Sans Unicode', 'Arial Unicode MS', var(--font); }
.vmean { font-size: 14.5px; margin-top: 2px; }
.vex { font-size: 13px; color: var(--muted); margin-top: 6px; font-style: italic; cursor: pointer; }
.vex:hover { color: var(--text); }
.vitem.in-srs { box-shadow: inset 3px 0 0 var(--ok); }

/* Flashcards */
.flash-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.select {
  padding: 8px 12px; border-radius: 10px; background: var(--panel-solid); border: 1px solid var(--border-2); color: var(--text);
}
.flash-wrap { perspective: 1400px; max-width: 560px; margin: 0 auto; }
.flash { position: relative; height: 320px; transform-style: preserve-3d; transition: transform .6s var(--ease); cursor: pointer; }
.flash.flipped { transform: rotateY(180deg); }
.face {
  position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px;
  padding: 30px; border-radius: 26px; backface-visibility: hidden; -webkit-backface-visibility: hidden; text-align: center;
  border: 1px solid var(--border-2); box-shadow: var(--shadow);
}
.face.front { background: linear-gradient(145deg, rgba(155,140,255,.22), #1b2740 70%); }
.face.back { background: linear-gradient(145deg, rgba(69,212,245,.2), #1b2740 70%); transform: rotateY(180deg); }
.fw { font-size: 42px; font-weight: 800; letter-spacing: -1px; line-height: 1.1; }
.fipa { font-size: 18px; color: var(--accent-2); }
.fmean { font-size: 28px; font-weight: 700; }
.fex { font-size: 16px; color: var(--muted); font-style: italic; max-width: 420px; }
.flash-ctrl { display: flex; justify-content: center; gap: 14px; margin: 22px 0 16px; }
.flash-ctrl .btn { min-width: 150px; }
.flash-prog { max-width: 560px; margin: 0 auto; }
.kbd-hint { text-align: center; color: var(--dim); font-size: 12.5px; margin-top: 12px; }
kbd { padding: 1px 7px; border-radius: 6px; background: rgba(255,255,255,.08); border: 1px solid var(--border-2); font-size: 11.5px; font-family: inherit; }
.done-box { text-align: center; padding: 40px 20px; display: grid; gap: 14px; justify-items: center; }
.done-box .big-emoji { font-size: 54px; }

.srs-boxes { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; margin-top: 14px; }
.srs-box { text-align: center; padding: 14px 8px; border-radius: 14px; background: rgba(255,255,255,.03); border: 1px solid var(--border); }
.srs-box b { display: block; font-size: 22px; }
.srs-box small { color: var(--muted); font-size: 11.5px; }
.rate-ctrl { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; max-width: 560px; margin: 22px auto 14px; }
.rate-ctrl .btn { flex-direction: column; gap: 0; padding: 12px; }
.rate-ctrl small { font-weight: 500; opacity: .75; font-size: 11.5px; }

/* ---------- Practice sets ---------- */
.set { margin-bottom: 16px; padding: 0; overflow: hidden; }
.set-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 24px; flex-wrap: wrap; }
.set-n { font-size: 12px; font-weight: 800; color: var(--pc); text-transform: uppercase; letter-spacing: .08em; }
.set-head p { color: var(--muted); font-size: 13.5px; margin-top: 2px; }
.set-meta { display: flex; align-items: center; gap: 12px; }
.score-badge { padding: 5px 12px; border-radius: 10px; font-size: 13px; font-weight: 700; }
.score-badge.pass { background: var(--ok-bg); color: var(--ok); }
.score-badge.fail { background: var(--warn-bg); color: var(--warn); }
.set-body { padding: 0 24px 24px; }
.set-body:empty { display: none; }

.test-intro { display: grid; grid-template-columns: auto 1fr auto; gap: 22px; align-items: center; margin-bottom: 18px; }
.test-ic { width: 64px; height: 64px; border-radius: 20px; display: grid; place-items: center; background: var(--grad); color: #fff; }
.test-ic .ic { width: 30px; height: 30px; }

/* ---------- Exercise engine ---------- */
.ex-list { list-style: none; display: grid; gap: 12px; counter-reset: ex; }
.ex-item {
  padding: 18px 20px; border-radius: 16px; background: rgba(255,255,255,.03); border: 1px solid var(--border);
  transition: border-color .3s, background .3s;
}
.ex-item.is-right { border-color: rgba(52,211,153,.45); background: rgba(52,211,153,.05); }
.ex-item.is-wrong { border-color: rgba(251,113,133,.45); background: rgba(251,113,133,.05); }
.ex-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.ex-n { width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; background: rgba(255,255,255,.07); font-size: 12.5px; font-weight: 700; }
.ex-type { font-size: 11.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; color: var(--dim); }
.ex-q { font-size: 16px; line-height: 1.9; }
.ex-q b { color: var(--text); }
.ex-hint { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 8px; margin-top: 12px; }
.opt {
  display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-radius: 12px; text-align: left;
  background: rgba(255,255,255,.04); border: 1px solid var(--border); transition: all .18s; font-size: 15px;
}
.opt:hover:not(:disabled) { border-color: var(--border-2); background: rgba(255,255,255,.07); }
.opt-k { width: 24px; height: 24px; border-radius: 7px; display: grid; place-items: center; flex-shrink: 0; background: rgba(255,255,255,.07); font-size: 12px; font-weight: 700; }
.opt.sel { border-color: var(--accent); background: rgba(139,123,255,.14); }
.opt.sel .opt-k { background: var(--accent); color: #fff; }
.opt.right { border-color: var(--ok); background: var(--ok-bg); }
.opt.right .opt-k { background: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.opt.wrong .opt-k { background: var(--bad); color: #fff; }
.opt:disabled { cursor: default; }

.blank {
  display: inline-block; min-width: 7em; padding: 3px 10px; margin: 0 4px; border-radius: 9px;
  background: rgba(255,255,255,.06); border: 1px solid var(--border-2); border-bottom: 2px solid var(--accent);
  color: #fff; font-weight: 600; outline: none; transition: all .2s; vertical-align: baseline; line-height: 1.5;
}
.blank:focus { border-color: var(--accent); background: rgba(139,123,255,.12); box-shadow: 0 0 0 4px rgba(139,123,255,.15); }
.blank.right { border-color: var(--ok); background: var(--ok-bg); color: var(--ok); }
.blank.wrong { border-color: var(--bad); background: var(--bad-bg); color: var(--bad); text-decoration: line-through; }
.blank.wide { min-width: 13em; }

.order-line {
  min-height: 54px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 10px; margin: 12px 0 10px;
  border-radius: 12px; border: 1.5px dashed var(--border-2); background: rgba(0,0,0,.15);
}
.order-line:empty::before { content: attr(data-ph); color: var(--dim); font-size: 13.5px; padding-left: 4px; }
.order-line.right { border-color: var(--ok); border-style: solid; }
.order-line.wrong { border-color: var(--bad); border-style: solid; }
.order-bank { display: flex; flex-wrap: wrap; gap: 8px; }
.chip-tok {
  padding: 7px 13px; border-radius: 10px; font-weight: 600; font-size: 15px;
  background: rgba(255,255,255,.07); border: 1px solid var(--border-2); border-bottom-width: 3px; transition: all .15s;
}
.chip-tok:hover:not(:disabled) { transform: translateY(-2px); border-color: var(--accent); }
.chip-tok.ghost { opacity: .18; pointer-events: none; }
.order-line .chip-tok { background: rgba(139,123,255,.15); border-color: rgba(139,123,255,.45); }

.fix-line { display: flex; flex-wrap: wrap; gap: 6px; font-size: 16px; }
.fix-tok { padding: 5px 10px; border-radius: 9px; border: 1px solid transparent; background: rgba(255,255,255,.04); transition: all .15s; font-size: 16px; }
.fix-tok:hover:not(:disabled) { border-color: var(--border-2); }
.fix-tok.sel { border-color: var(--warn); background: var(--warn-bg); color: var(--warn); }
.fix-tok.right { border-color: var(--ok); background: var(--ok-bg); color: var(--ok); }
.fix-tok.wrong { border-color: var(--bad); background: var(--bad-bg); color: var(--bad); text-decoration: line-through; }
.fix-corr { margin-left: 6px; font-weight: 700; color: var(--ok); }
.fix-tok:disabled { cursor: default; }

.vi-flag { display: inline-block; padding: 1px 7px; border-radius: 6px; font-size: 11px; font-weight: 800; background: #da251d; color: #ffde00; vertical-align: 2px; margin-right: 4px; }
.trans-in, .note-area {
  width: 100%; margin-top: 10px; padding: 12px 14px; border-radius: 12px; resize: vertical;
  background: rgba(0,0,0,.2); border: 1px solid var(--border-2); outline: none; font-size: 15px; line-height: 1.6;
}
.trans-in:focus, .note-area:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(139,123,255,.15); }
.trans-in.right { border-color: var(--ok); }
.trans-in.wrong { border-color: var(--bad); }
.listen-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.listen-row .blank { min-width: 14em; font-size: 16px; padding: 8px 12px; }

/* Audio Listen Choice */
.listen-choice-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.listen-play-btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; font-weight: 700;
  font-size: 14px; border: none; cursor: pointer; box-shadow: 0 4px 12px rgba(139,123,255,.3);
  transition: all .2s var(--ease);
}
.listen-play-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(139,123,255,.45); }

/* Matching Pairs */
.match-board { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 12px 0; }
@media (max-width: 640px) { .match-board { grid-template-columns: 1fr; } }
.match-col { display: flex; flex-direction: column; gap: 8px; }
.match-col-title { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; color: var(--muted); margin-bottom: 2px; }
.match-card {
  display: flex; align-items: center; justify-content: space-between; padding: 11px 15px; border-radius: 12px;
  background: rgba(255,255,255,.05); border: 1.5px solid var(--border-2); cursor: pointer;
  transition: all .18s var(--ease); font-size: 14.5px; font-weight: 600; color: var(--fg); user-select: none;
}
.match-card:hover:not(:disabled) { border-color: var(--accent); background: rgba(139,123,255,.1); transform: translateY(-1px); }
.match-card.selected { border-color: var(--accent); background: rgba(139,123,255,.22); box-shadow: 0 0 0 3px rgba(139,123,255,.25); }
.match-card.paired { border-color: rgba(61,214,245,.6); background: rgba(61,214,245,.12); }
.match-card.right { border-color: var(--ok) !important; background: var(--ok-bg) !important; color: var(--ok) !important; }
.match-card.wrong { border-color: var(--bad) !important; background: var(--bad-bg) !important; color: var(--bad) !important; }
.match-badge {
  display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px;
  border-radius: 50%; font-size: 11px; font-weight: 800; background: var(--accent); color: #fff; flex-shrink: 0; margin-left: 8px;
}

/* Dialogue Context */
.dialogue-box {
  background: rgba(0,0,0,.15); border: 1px solid var(--border-2); border-radius: 14px; padding: 14px 16px;
  margin: 10px 0 14px; display: flex; flex-direction: column; gap: 10px;
}
.dialogue-context {
  font-size: 13px; font-weight: 700; color: var(--accent-2); display: flex; align-items: center; gap: 6px;
  padding-bottom: 6px; border-bottom: 1px dashed var(--border-2);
}
.dialogue-msg { display: flex; align-items: flex-start; gap: 10px; }
.dialogue-msg.speaker-b { flex-direction: row-reverse; }
.dialogue-avatar {
  font-size: 11.5px; font-weight: 800; padding: 4px 8px; border-radius: 8px; background: var(--panel-2);
  border: 1px solid var(--border-2); color: var(--muted); flex-shrink: 0;
}
.dialogue-bubble {
  max-width: 80%; padding: 8px 14px; border-radius: 14px; font-size: 14.5px; line-height: 1.5;
  background: rgba(255,255,255,.06); border: 1px solid var(--border-2);
}
.speaker-b .dialogue-bubble { background: rgba(139,123,255,.15); border-color: rgba(139,123,255,.3); }
.dialogue-bubble.target { border: 1.5px dashed var(--accent); background: rgba(139,123,255,.08); font-weight: 600; }

/* Cloze Test */
.cloze-box {
  background: rgba(0,0,0,.15); border: 1px solid var(--border-2); border-radius: 14px; padding: 16px 18px;
  margin: 10px 0 14px; line-height: 2.1; font-size: 15px;
}

.ex-fb:empty { display: none; }
.ex-fb { margin-top: 12px; display: grid; gap: 6px; font-size: 14.5px; animation: fadeUp .35s var(--ease); }
.fb-line { display: flex; align-items: flex-start; gap: 8px; font-weight: 600; }
.fb-line.ok { color: var(--ok); }
.fb-line.bad { color: var(--bad); }
.fb-line.bad b { color: var(--text); }
.fb-line .ic { margin-top: 3px; }
.fb-more { color: var(--muted); font-size: 13.5px; }
.fb-ex { color: var(--text); padding: 8px 12px; border-radius: 10px; background: var(--panel-2); border: 1px solid var(--border); }

.ex-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 18px; flex-wrap: wrap; }
.ex-banner {
  display: flex; align-items: center; gap: 22px; padding: 22px; border-radius: 20px; margin-bottom: 16px;
  border: 1px solid var(--border-2); animation: pop .5s var(--ease);
}
@keyframes pop { from { opacity: 0; transform: scale(.96); } to { opacity: 1; transform: none; } }
.ex-banner.great, .ex-banner.good { background: linear-gradient(135deg, rgba(52,211,153,.16), rgba(61,214,245,.06)); border-color: rgba(52,211,153,.4); }
.ex-banner.ok { background: linear-gradient(135deg, rgba(251,191,36,.14), transparent); border-color: rgba(251,191,36,.4); }
.ex-banner.low { background: linear-gradient(135deg, rgba(251,113,133,.14), transparent); border-color: rgba(251,113,133,.4); }
.score-circle {
  width: 96px; height: 96px; border-radius: 50%; display: grid; place-items: center; align-content: center; flex-shrink: 0;
  background: rgba(0,0,0,.25); border: 3px solid currentColor;
}
.great .score-circle, .good .score-circle { color: var(--ok); }
.ok .score-circle { color: var(--warn); }
.low .score-circle { color: var(--bad); }
.score-circle b { font-size: 22px; line-height: 1; color: #fff; }
.score-circle small { font-size: 13px; font-weight: 700; }
.banner-body { display: grid; gap: 8px; }
.banner-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px; }

/* ---------- Speaking ---------- */
.task { margin-bottom: 18px; display: grid; gap: 14px; }
.task header { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.task header h3 { font-size: 19px; }
.task .prompt { color: var(--text); font-size: 15px; }
.useful b { display: block; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.chip-say { cursor: pointer; color: var(--text); font-weight: 500; font-size: 13.5px; }
.chip-say:hover { border-color: var(--accent-2); color: var(--accent-2); }
.write-tools { display: flex; align-items: center; gap: 10px; margin-top: 8px; flex-wrap: wrap; }
.write-tools .wc { font-size: 12.5px; color: var(--dim); margin-right: auto; }
.mic-on { background: var(--bad-bg) !important; color: var(--bad) !important; border-color: var(--bad) !important; animation: pulse 1.5s infinite; }
.model { padding: 18px; border-radius: 14px; background: rgba(61,214,245,.06); border: 1px solid rgba(61,214,245,.25); display: grid; gap: 12px; animation: fadeUp .35s var(--ease); }
.model-text { font-size: 15px; line-height: 1.8; }
.checklist { display: grid; gap: 8px; }
.checklist b { font-size: 13px; color: var(--muted); }
.check { display: flex; align-items: center; gap: 10px; font-size: 14px; cursor: pointer; user-select: none; }
.check input { appearance: none; width: 20px; height: 20px; border-radius: 6px; border: 1.5px solid var(--border-2); display: grid; place-items: center; transition: all .2s; flex-shrink: 0; cursor: pointer; }
.check input:checked { background: var(--ok); border-color: var(--ok); }
.check input:checked::after { content: "✓"; color: #fff; font-size: 13px; font-weight: 800; }

/* ---------- Method page ---------- */
.method-head { margin-bottom: 26px; display: grid; gap: 14px; }
.data-tools { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------- Toast & confetti ---------- */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 140%); z-index: 100;
  padding: 13px 22px; border-radius: 14px; font-weight: 600; font-size: 14.5px;
  background: #1b2740; border: 1px solid var(--border-2); box-shadow: var(--shadow);
  backdrop-filter: blur(16px); transition: transform .45s var(--ease); max-width: 90vw;
}
.toast.show { transform: translate(-50%, 0); }
.confetti { position: fixed; inset: 0; pointer-events: none; z-index: 200; overflow: hidden; }
.confetti i { position: absolute; top: -20px; width: 9px; height: 15px; border-radius: 2px; animation: fall linear forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(720deg); opacity: .7; } }

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .phase { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid-plan { grid-template-columns: 1fr; }
  .grid-plan > .card { position: static; }
}
@media (max-width: 960px) {
  .layout { display: block; }
  .main { grid-column: auto; width: 100%; max-width: 100%; }
  .topbar {
    display: flex; align-items: center; gap: 12px; position: sticky; top: 0; z-index: 40; padding: 12px 16px;
    background: var(--bg-2); backdrop-filter: blur(16px); border-bottom: 1px solid var(--border);
  }
  .topbar-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
  .topbar .logo { width: 34px; height: 34px; font-size: 14px; border-radius: 10px; }
  .menu-btn { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 11px; background: var(--panel); border: 1px solid var(--border); }
  .menu-btn svg { width: 22px; height: 22px; }
  .sidebar { position: fixed; z-index: 60; left: 0; top: 0; width: 290px; transform: translateX(-100%); transition: transform .35s var(--ease); background: var(--bg-2); }
  .sidebar.open { transform: none; }
  .overlay { display: block; position: fixed; inset: 0; z-index: 50; background: rgba(0,0,0,.55); opacity: 0; pointer-events: none; transition: opacity .3s; }
  .overlay.show { opacity: 1; pointer-events: auto; }
  .tabs { top: 72px; }
  .hero { grid-template-columns: 1fr; padding: 28px; }
  .hero-ring { justify-self: start; display: flex; align-items: center; gap: 16px; }
  .grid-2 { grid-template-columns: 1fr; }
  .phase-weeks { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .main { padding-top: 22px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat { padding: 14px; gap: 10px; }
  .stat b { font-size: 20px; }
  .week-head { flex-direction: column; align-items: flex-start; }
  .tab span { display: none; }
  .tab { padding: 10px 12px; }
  .phase-weeks { grid-template-columns: 1fr; }
  .test-intro { grid-template-columns: 1fr; }
  .ex-banner { flex-direction: column; text-align: center; }
  .banner-actions { justify-content: center; }
  .srs-boxes { grid-template-columns: repeat(3, 1fr); }
  .fw { font-size: 34px; }
  .flash { height: 290px; }
  .card { padding: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------- Day Filter & Collocations ---------- */
.day-filter-pills {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 14px 0 18px;
  padding-bottom: 4px;
}
.day-pill {
  padding: 6px 14px;
  border-radius: 99px;
  font-size: 13px;
  font-weight: 600;
  border: 1.5px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
  transition: all .2s var(--ease);
}
.day-pill:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-1px);
}
.day-pill.active {
  background: var(--pc);
  border-color: var(--pc);
  color: #fff;
  box-shadow: 0 4px 14px -3px var(--pc);
}
.vcolloc {
  font-size: 13px;
  padding: 5px 10px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  margin-top: 6px;
  color: var(--accent);
  line-height: 1.45;
}
.fcolloc {
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  margin-top: 12px;
  color: var(--accent);
  text-align: left;
}
.day-action-row {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
  align-items: center;
}

/* ---------- Theme Switcher ---------- */
.theme-pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 14px;
  border-radius: 99px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  background: var(--panel);
  border: 1px solid var(--border-2);
  color: var(--text);
  transition: all .2s var(--ease);
}
.theme-pill-btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
.theme-ic { font-size: 15px; line-height: 1; }
.topbar .theme-pill-btn { margin-left: auto; }
.sidebar-theme-wrap {
  padding: 0 10px 14px;
  display: flex;
  justify-content: flex-start;
}

/* ---------- Lesson Completion & Action Bar ---------- */
.lesson-action-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}
.lesson-check-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s var(--ease);
  border: 1.5px solid var(--border-2);
  background: var(--panel);
  color: var(--text);
}
.lesson-check-btn:hover {
  transform: translateY(-2px);
  border-color: var(--ok);
}
.lesson-check-btn.done {
  background: var(--ok-bg);
  border-color: var(--ok);
  color: var(--ok);
}
.lesson-status-txt {
  font-size: 13px;
  color: var(--muted);
  font-weight: 500;
}

/* ---------- Word Mastery Button ---------- */
.word-master-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  transition: all .2s;
  white-space: nowrap;
}
.word-master-btn:hover {
  border-color: var(--ok);
  color: var(--ok);
}
.word-master-btn.mastered {
  background: var(--ok-bg);
  border-color: var(--ok);
  color: var(--ok);
}

/* ---------- History & Storage Screen ---------- */
.storage-banner {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 22px;
  border-radius: 20px;
  background: var(--panel);
  border: 1px solid var(--border-2);
  margin-bottom: 24px;
}
.storage-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--ok-bg);
  color: var(--ok);
  display: grid;
  place-items: center;
  font-size: 24px;
  flex-shrink: 0;
}
.storage-content { flex: 1; }
.storage-content h3 { font-size: 18px; margin-bottom: 6px; }
.storage-content p { color: var(--muted); font-size: 14px; line-height: 1.6; }
.storage-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.history-table-wrap {
  overflow-x: auto;
  border-radius: 16px;
  border: 1px solid var(--border);
  margin-top: 14px;
}
.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}
.history-table th {
  padding: 12px 16px;
  background: var(--panel-2);
  color: var(--muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}
.history-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.history-table tr:last-child td {
  border-bottom: none;
}
.history-score-pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 99px;
  font-weight: 700;
  font-size: 12.5px;
}
.history-score-pill.pass {
  background: var(--ok-bg);
  color: var(--ok);
}
.history-score-pill.fail {
  background: var(--bad-bg);
  color: var(--bad);
}

[data-theme="light"] .match-card {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #1e293b;
}
[data-theme="light"] .match-card:hover:not(:disabled) {
  background: #f1f5f9;
  border-color: var(--accent);
}
[data-theme="light"] .match-card.selected {
  background: #ede9fe;
  border-color: #7c3aed;
}
[data-theme="light"] .match-card.paired {
  background: #e0f2fe;
  border-color: #0284c7;
}
[data-theme="light"] .dialogue-box {
  background: #f8fafc;
  border-color: #e2e8f0;
}
[data-theme="light"] .dialogue-bubble {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #1e293b;
}
[data-theme="light"] .speaker-b .dialogue-bubble {
  background: #ede9fe;
  border-color: #c4b5fd;
}
[data-theme="light"] .cloze-box {
  background: #f8fafc;
  border-color: #e2e8f0;
  color: #1e293b;
}



/* =========================================================
   EXTENDED SPEAKING TAB - Dialogues, Listening, Speaking
   ========================================================= */

/* Sub-navigation pills */
.speaking-subnav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

/* Dialogue cards */
.dialogue-card {
  border-left: 4px solid var(--accent);
}

.dialogue-lines {
  background: var(--panel-2);
  border-radius: 12px;
  padding: 16px;
}

.dialogue-line {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.dialogue-line:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.speaker-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  flex-shrink: 0;
}

/* Listening exercise items */
.question-item {
  padding: 16px;
  background: var(--panel-2);
  border-radius: 10px;
  margin-bottom: 12px;
}

.option-label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  background: var(--bg);
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: all 0.2s var(--ease);
}

.option-label:hover {
  background: var(--panel-2);
  border-color: var(--accent);
}

.option-label input[type="radio"]:checked + span {
  color: var(--accent);
  font-weight: 600;
}

.answer-reveal {
  margin-top: 12px;
  padding: 12px;
  background: var(--ok-bg);
  border-radius: 8px;
  border-left: 3px solid var(--ok);
}

/* Speaking task specific */
.speaking-tasks-section .card {
  border-left: 4px solid var(--ok);
}

/* Inline input for fill-blank */
.inline-input {
  display: inline-block;
  width: 120px;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: inherit;
}

.inline-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(139, 123, 255, 0.2);
}

/* Listening section */
.listening-section .card {
  border-left: 4px solid #3b82f6;
}

/* Hidden utility */
.hidden {
  display: none !important;
}

/* Details summary styling */
details summary {
  cursor: pointer;
  font-weight: 600;
  padding: 8px 0;
  color: var(--accent);
}

details summary:hover {
  text-decoration: underline;
}

details[open] summary {
  margin-bottom: 12px;
}

/* Light theme adjustments for new sections */
[data-theme="light"] .dialogue-card {
  border-left-color: #4f46e5;
}

[data-theme="light"] .listening-section .card {
  border-left-color: #2563eb;
}

[data-theme="light"] .speaking-tasks-section .card {
  border-left-color: #059669;
}

[data-theme="light"] .option-label {
  background: #f8fafc;
  border-color: #e2e8f0;
}

[data-theme="light"] .option-label:hover {
  background: #f1f5f9;
  border-color: #4f46e5;
}

[data-theme="light"] .answer-reveal {
  background: rgba(5, 150, 105, 0.1);
  border-left-color: #059669;
}

[data-theme="light"] .inline-input {
  background: #ffffff;
  border-color: #e2e8f0;
  color: #0f172a;
}

[data-theme="light"] .inline-input:focus {
  border-color: #4f46e5;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}


/* ==========================================================================
   Day-First Navigation - Week Overview Grid
   ========================================================================== */

.day-overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  padding: 1rem 0;
}

.day-overview-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.day-overview-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  border-color: var(--accent);
}

.doc-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 999px;
  width: fit-content;
}

.doc-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.doc-info h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}

.doc-info p {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.4;
}

.doc-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

.doc-stats span {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  color: var(--muted);
  background: var(--bg);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.doc-arrow {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  color: var(--accent);
  font-size: 1.25rem;
  margin-top: 0.5rem;
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.day-overview-card:hover .doc-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ==========================================================================
   Day-First Navigation - Day Header
   ========================================================================== */

.day-header {
  background: linear-gradient(135deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 80%, #000) 100%);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  color: #fff;
}

.day-header-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.day-header-content h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.day-header-content p {
  font-size: 0.95rem;
  margin: 0;
  opacity: 0.9;
}

.day-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* ==========================================================================
   Day-First Navigation - Sections
   ========================================================================== */

.section-day {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.section-day > h2 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.section-day > h2 .icon {
  font-size: 1.25rem;
}

/* Task List in Day View */
.task-list-day {
  list-style: none;
  padding: 0;
  margin: 0;
}

.task-list-day li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s var(--ease);
}

.task-list-day li:last-child {
  border-bottom: none;
}

.task-list-day li:hover {
  background: var(--bg);
}

.task-list-day .task-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.task-list-day .task-content {
  flex: 1;
  min-width: 0;
}

.task-list-day .task-content strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.task-list-day .task-content span {
  font-size: 0.85rem;
  color: var(--muted);
}

/* ==========================================================================
   Day-First Navigation - Grammar Cards
   ========================================================================== */

.grammar-list-day {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.grammar-card {
  border-bottom: 1px solid var(--border);
}

.grammar-card:last-child {
  border-bottom: none;
}

.grammar-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  transition: background 0.15s var(--ease);
}

.grammar-head:hover {
  background: var(--bg);
}

.grammar-head .toggle-icon {
  font-size: 1rem;
  color: var(--muted);
  transition: transform 0.2s var(--ease);
}

.grammar-card.expanded .grammar-head .toggle-icon {
  transform: rotate(90deg);
}

.grammar-head h3 {
  flex: 1;
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.grammar-head .grammar-tag {
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  background: var(--accent);
  color: #fff;
  border-radius: 4px;
  text-transform: uppercase;
  font-weight: 600;
}

.grammar-body {
  display: none;
  padding: 0 1.25rem 1.25rem 1.25rem;
  animation: slideDown 0.2s var(--ease);
}

.grammar-card.expanded .grammar-body {
  display: block;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.grammar-explain {
  background: var(--bg);
  border-radius: calc(var(--radius) - 4px);
  padding: 1rem;
  margin-bottom: 1rem;
}

.grammar-explain p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.6;
}

.grammar-examples {
  margin-bottom: 1rem;
}

.grammar-examples h4 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0 0 0.75rem 0;
}

.grammar-examples ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.grammar-examples li {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem;
  background: var(--bg);
  border-radius: calc(var(--radius) - 4px);
  border-left: 3px solid var(--accent);
}

.grammar-examples .en {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
}

.grammar-examples .vi {
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}

.grammar-mistakes {
  background: color-mix(in srgb, var(--bad) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--bad) 30%, transparent);
  border-radius: calc(var(--radius) - 4px);
  padding: 1rem;
}

.grammar-mistakes h4 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--bad);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0 0 0.75rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.grammar-mistakes ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.grammar-mistakes li {
  font-size: 0.85rem;
  color: var(--text);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.grammar-mistakes li::before {
  content: "✗";
  color: var(--bad);
  font-weight: bold;
}

/* ==========================================================================
   Day-First Navigation - Dialogue Cards
   ========================================================================== */

.dialogue-card {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem;
}

.dialogue-card:last-child {
  border-bottom: none;
}

.dialogue-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.dialogue-header h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.dialogue-header .dialogue-context {
  font-size: 0.8rem;
  color: var(--muted);
  background: var(--bg);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
}

.dialogue-lines {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.dialogue-line {
  display: flex;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--bg);
  border-radius: calc(var(--radius) - 4px);
}

.dialogue-line.speaker-a {
  border-left: 3px solid var(--accent);
}

.dialogue-line.speaker-b {
  border-left: 3px solid var(--pc);
  margin-left: 1.5rem;
}

.dialogue-line .speaker {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--accent);
  min-width: 60px;
}

.dialogue-line.speaker-b .speaker {
  color: var(--pc);
}

.dialogue-line .line-content {
  flex: 1;
}

.dialogue-line .line-en {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.dialogue-line .line-vi {
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}

.dialogue-phrases {
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border-radius: calc(var(--radius) - 4px);
  padding: 1rem;
}

.dialogue-phrases h4 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0 0 0.75rem 0;
}

.dialogue-phrases ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.dialogue-phrases li {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--panel);
  padding: 0.5rem 0.75rem;
  border-radius: calc(var(--radius) - 4px);
  font-size: 0.85rem;
}

.dialogue-phrases .phrase-en {
  font-weight: 500;
  color: var(--text);
}

.dialogue-phrases .phrase-vi {
  color: var(--muted);
  font-size: 0.8rem;
}

/* ==========================================================================
   Day-First Navigation - Day Navigation (Prev/Next)
   ========================================================================== */

.day-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem 0;
  margin-top: 1rem;
  border-top: 1px solid var(--border);
}

.day-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s var(--ease);
}

.day-nav a:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: translateY(-1px);
}

.day-nav a.disabled {
  opacity: 0.4;
  pointer-events: none;
}

.day-nav .nav-label {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.day-nav .nav-label small {
  font-size: 0.7rem;
  color: var(--muted);
  font-weight: 400;
}

.day-nav a:hover .nav-label small {
  color: rgba(255, 255, 255, 0.8);
}

/* ==========================================================================
   Day-First Navigation - Exercise Sets
   ========================================================================== */

.exercise-set-day {
  border-bottom: 1px solid var(--border);
}

.exercise-set-day:last-child {
  border-bottom: none;
}

.exercise-set-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--bg);
  cursor: pointer;
  transition: background 0.15s var(--ease);
}

.exercise-set-header:hover {
  background: color-mix(in srgb, var(--bg) 80%, var(--accent));
}

.exercise-set-header h3 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.exercise-set-header .set-count {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
  background: var(--panel);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.exercise-set-header .toggle-icon {
  font-size: 1rem;
  color: var(--muted);
  transition: transform 0.2s var(--ease);
}

.exercise-set-day.expanded .exercise-set-header .toggle-icon {
  transform: rotate(90deg);
}

.exercise-items {
  display: none;
  padding: 1rem 1.25rem;
}

.exercise-set-day.expanded .exercise-items {
  display: block;
}

.exercise-actions {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.exercise-actions button {
  flex: 1;
  padding: 0.6rem 1rem;
  border: none;
  border-radius: calc(var(--radius) - 4px);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s var(--ease);
}

.exercise-actions .btn-check {
  background: var(--accent);
  color: #fff;
}

.exercise-actions .btn-check:hover {
  background: color-mix(in srgb, var(--accent) 85%, #000);
}

.exercise-actions .btn-reset {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
}

.exercise-actions .btn-reset:hover {
  background: var(--bg);
}

/* Exercise Items */
.ex-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 4px);
  padding: 1rem;
  margin-bottom: 1rem;
}

.ex-item:last-child {
  margin-bottom: 0;
}

.ex-item.correct {
  border-color: var(--ok);
  background: color-mix(in srgb, var(--ok) 5%, var(--panel));
}

.ex-item.incorrect {
  border-color: var(--bad);
  background: color-mix(in srgb, var(--bad) 5%, var(--panel));
}

.ex-q {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.ex-q .blank {
  display: inline-block;
  min-width: 80px;
  border-bottom: 2px dashed var(--accent);
  margin: 0 0.25rem;
}

/* Multiple Choice Options */
.ex-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.ex-opt {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 4px);
  cursor: pointer;
  transition: all 0.15s var(--ease);
}

.ex-opt:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 5%, var(--bg));
}

.ex-opt.selected {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--bg));
}

.ex-opt.correct {
  border-color: var(--ok);
  background: color-mix(in srgb, var(--ok) 10%, var(--bg));
}

.ex-opt.incorrect {
  border-color: var(--bad);
  background: color-mix(in srgb, var(--bad) 10%, var(--bg));
}

.ex-opt input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.ex-opt label {
  flex: 1;
  font-size: 0.9rem;
  color: var(--text);
  cursor: pointer;
}

/* Fill-in-the-blank Input */
.ex-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 4px);
  font-size: 0.95rem;
  color: var(--text);
  transition: border-color 0.15s var(--ease);
}

.ex-input:focus {
  outline: none;
  border-color: var(--accent);
}

.ex-input.correct {
  border-color: var(--ok);
  background: color-mix(in srgb, var(--ok) 5%, var(--bg));
}

.ex-input.incorrect {
  border-color: var(--bad);
  background: color-mix(in srgb, var(--bad) 5%, var(--bg));
}

/* Word Order / Drag Words */
.ex-words {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: calc(var(--radius) - 4px);
  min-height: 60px;
}

.ex-word {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 4px);
  font-size: 0.9rem;
  color: var(--text);
  cursor: grab;
  user-select: none;
  transition: all 0.15s var(--ease);
}

.ex-word:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.ex-word.dragging {
  opacity: 0.5;
  cursor: grabbing;
}

.ex-word.placed {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Error Correction */
.ex-error-sentence {
  padding: 1rem;
  background: color-mix(in srgb, var(--bad) 8%, var(--bg));
  border: 1px solid color-mix(in srgb, var(--bad) 20%, transparent);
  border-radius: calc(var(--radius) - 4px);
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.ex-error-sentence .error-word {
  color: var(--bad);
  text-decoration: line-through;
  font-weight: 500;
}

/* ==========================================================================
   Day-First Navigation - Light Theme Overrides
   ========================================================================== */

[data-theme="light"] .day-overview-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .day-header {
  background: linear-gradient(135deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 85%, #000) 100%);
}

[data-theme="light"] .grammar-explain {
  background: #f8f9fa;
}

[data-theme="light"] .grammar-examples li {
  background: #f8f9fa;
}

[data-theme="light"] .dialogue-line {
  background: #f8f9fa;
}

[data-theme="light"] .dialogue-phrases {
  background: color-mix(in srgb, var(--accent) 6%, #fff);
}

[data-theme="light"] .exercise-set-header {
  background: #f8f9fa;
}

[data-theme="light"] .exercise-set-header:hover {
  background: #f0f1f3;
}

[data-theme="light"] .ex-item {
  background: #fff;
}

[data-theme="light"] .ex-opt {
  background: #f8f9fa;
}

[data-theme="light"] .ex-opt:hover {
  background: color-mix(in srgb, var(--accent) 5%, #f8f9fa);
}

[data-theme="light"] .ex-input {
  background: #fff;
}

[data-theme="light"] .ex-words {
  background: #f8f9fa;
}

[data-theme="light"] .ex-word {
  background: #fff;
}

/* ==========================================================================
   Day-First Navigation - Responsive
   ========================================================================== */

@media (max-width: 768px) {
  .day-overview-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .day-overview-card {
    padding: 1rem;
  }

  .day-header {
    padding: 1.25rem;
    margin-bottom: 1rem;
  }

  .day-header-content h1 {
    font-size: 1.25rem;
  }

  .section-day > h2 {
    padding: 0.875rem 1rem;
    font-size: 1rem;
  }

  .task-list-day li {
    padding: 0.875rem 1rem;
  }

  .grammar-head {
    padding: 0.875rem 1rem;
  }

  .grammar-body {
    padding: 0 1rem 1rem 1rem;
  }

  .dialogue-card {
    padding: 1rem;
  }

  .dialogue-line.speaker-b {
    margin-left: 0.75rem;
  }

  .day-nav {
    flex-direction: column;
    gap: 0.75rem;
  }

  .day-nav a {
    width: 100%;
    justify-content: center;
  }

  .exercise-set-header {
    padding: 0.875rem 1rem;
  }

  .exercise-items {
    padding: 0.875rem 1rem;
  }

  .exercise-actions {
    padding: 0.875rem 1rem;
  }

  .ex-options {
    gap: 0.4rem;
  }

  .ex-opt {
    padding: 0.65rem 0.875rem;
  }
}

@media (max-width: 480px) {
  .doc-stats {
    flex-direction: column;
    gap: 0.4rem;
  }

  .doc-stats span {
    width: fit-content;
  }

  .dialogue-line {
    flex-direction: column;
    gap: 0.5rem;
  }

  .dialogue-line .speaker {
    min-width: unset;
  }

  .dialogue-phrases ul {
    flex-direction: column;
  }

  .dialogue-phrases li {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}

/* ==========================================================================
   Sidebar — Day-First Navigation (week groups + collapsible day list)
   ========================================================================== */
.nav-week-group { margin-bottom: 2px; }

.nav-week-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 11px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--muted);
  background: transparent;
  border: 1px solid transparent;
  text-align: left;
  transition: background .2s var(--ease), color .2s var(--ease);
}
.nav-week-toggle:hover { background: var(--panel); color: var(--text); }
.nav-week-toggle.active { background: var(--panel-2); color: var(--text); box-shadow: inset 3px 0 0 var(--pc); }
.nav-week-toggle.done .nw-n { background: var(--pc); color: #fff; }
.nav-week-toggle .nw-arrow {
  width: 15px; height: 15px; flex-shrink: 0; opacity: .5;
  transition: transform .25s var(--ease);
}
.nav-week-group.expanded .nav-week-toggle .nw-arrow { transform: rotate(180deg); opacity: .9; }

.nav-days {
  display: none;
  flex-direction: column;
  gap: 2px;
  margin: 3px 0 8px 17px;
  padding-left: 11px;
  border-left: 1.5px solid var(--border);
}
.nav-days.show { display: flex; }

.nav-day {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: 9px;
  font-size: 13px;
  color: var(--muted);
  transition: background .18s var(--ease), color .18s var(--ease);
}
.nav-day:hover { background: var(--panel); color: var(--text); }
.nav-day.active { background: color-mix(in srgb, var(--pc) 15%, transparent); color: var(--text); font-weight: 600; }
.nd-check {
  width: 21px; height: 21px; border-radius: 7px; flex-shrink: 0;
  display: grid; place-items: center;
  background: var(--panel-2); border: 1px solid var(--border);
  font-size: 11px; font-weight: 700;
}
.nav-day.done .nd-check { background: var(--ok); border-color: var(--ok); color: #fff; }
.nav-day.active .nd-check { background: var(--pc); border-color: var(--pc); color: #fff; }
.nd-label { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-day-overview { margin-top: 3px; padding-top: 9px; border-top: 1px dashed var(--border); color: var(--dim); font-weight: 600; }
.nav-day-overview .nd-check { background: transparent; border-color: transparent; }

/* Light-theme readability for sidebar badges & progress ring */
[data-theme="light"] .nw-n { background: #eef2ff; color: #4338ca; }
[data-theme="light"] .nd-check { background: #f1f5f9; border-color: #e2e8f0; color: #475569; }
[data-theme="light"] .nw-p { background: conic-gradient(var(--pc) calc(var(--p) * 1%), #e2e8f0 0); }

/* Grammar lesson badge in Day view */
.grammar-badge {
  width: 28px; height: 28px; border-radius: 9px; flex-shrink: 0;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--pc) 16%, transparent);
  color: var(--pc); font-weight: 800; font-size: 13px;
}
.grammar-card.completed .grammar-badge { background: var(--ok); color: #fff; }

/* ==========================================================================
   Vocab Trainer — học từ vựng theo ngày (hình ảnh + trò chơi)
   ========================================================================== */
.vt { display: flex; flex-direction: column; gap: 16px; }
.vt-nav { display: flex; flex-wrap: wrap; gap: 8px; }
.vt-mode-btn {
  padding: 8px 14px; border-radius: 99px; font-size: 13px; font-weight: 600;
  border: 1.5px solid var(--border); background: var(--panel); color: var(--muted);
  cursor: pointer; transition: all .2s var(--ease); white-space: nowrap;
}
.vt-mode-btn:hover { border-color: var(--accent); color: var(--text); transform: translateY(-1px); }
.vt-mode-btn.active { background: var(--pc); border-color: var(--pc); color: #fff; box-shadow: 0 4px 14px -3px var(--pc); }
.vt-mode-btn.vt-srs { margin-left: auto; color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 40%, transparent); }
.vt-body { min-height: 120px; }
.vt-hint { color: var(--muted); font-size: 14px; margin-bottom: 12px; }

/* Image box */
.vt-img { position: relative; border-radius: 16px; overflow: hidden; background: var(--panel-2); border: 1px solid var(--border); }
.vt-img img { display: block; width: 100%; height: 100%; object-fit: cover; }
.vt-img.sm { width: 100%; aspect-ratio: 4 / 3; }
.vt-img.flash { width: 150px; height: 112px; margin: 0 auto 6px; }
.vt-img.quiz { width: 160px; height: 120px; flex-shrink: 0; }
.vt-img-ph { position: absolute; inset: 0; display: grid; place-items: center; align-content: center; gap: 2px; color: var(--muted); font-size: 26px; }
.vt-img-ph small { font-size: 12px; font-weight: 600; }

/* List grid */
.vt-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.vt-wcard { display: flex; flex-direction: column; border: 1px solid var(--border); border-radius: 16px; overflow: hidden; background: var(--panel); transition: border-color .2s, transform .2s; }
.vt-wcard:hover { border-color: color-mix(in srgb, var(--pc) 45%, transparent); transform: translateY(-2px); }
.vt-wcard.is-mastered { box-shadow: inset 0 0 0 1.5px var(--ok); }
.vt-wbody { padding: 12px 14px 14px; display: flex; flex-direction: column; gap: 4px; }
.vt-wtop { display: flex; align-items: center; gap: 8px; }
.vt-word { font-weight: 800; font-size: 17px; }
.vt-pos { font-size: 11.5px; font-style: italic; color: var(--pc); }
.vt-say { width: 30px; height: 30px; border-radius: 9px; margin-left: auto; }
.vt-ipa { color: var(--accent-2); font-size: 13.5px; }
.vt-mean { font-size: 14.5px; font-weight: 500; }
.vt-ex { font-size: 13px; color: var(--muted); font-style: italic; cursor: pointer; }
.vt-ex:hover { color: var(--text); }
.vt-colloc { font-size: 12.5px; padding: 5px 9px; border-radius: 8px; margin-top: 2px; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent); border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent); }
.vt-mem { margin-top: 8px; padding: 7px 12px; border-radius: 10px; font-size: 13px; font-weight: 600;
  border: 1.5px solid var(--border); background: var(--panel); color: var(--muted); cursor: pointer; transition: all .2s; }
.vt-mem:hover { border-color: var(--ok); color: var(--ok); }
.vt-mem.on { background: var(--ok-bg); border-color: var(--ok); color: var(--ok); }

/* Match */
.vt-match { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.vt-match-col { display: flex; flex-direction: column; gap: 8px; }
.vt-mcard { padding: 11px 14px; border-radius: 12px; font-size: 14.5px; font-weight: 600; text-align: left;
  border: 1.5px solid var(--border-2); background: var(--panel); color: var(--text); cursor: pointer; transition: all .15s var(--ease); }
.vt-mcard:hover:not(.locked) { border-color: var(--accent); transform: translateY(-1px); }
.vt-mcard.sel { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 16%, transparent); }
.vt-mcard.ok { border-color: var(--ok); background: var(--ok-bg); color: var(--ok); cursor: default; }
.vt-mcard.bad { border-color: var(--bad); background: var(--bad-bg); color: var(--bad); animation: vtShake .4s; }
.vt-mcard.locked { opacity: .75; pointer-events: none; }
.vt-match-foot { text-align: center; }
@keyframes vtShake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-5px)} 75%{transform:translateX(5px)} }

/* Quiz / Listen */
.vt-quiz, .vt-listen, .vt-spell { display: flex; flex-direction: column; gap: 14px; align-items: center; }
.vt-q-word { display: flex; align-items: center; gap: 10px; font-size: 22px; }
.vt-q-ask { font-size: 15px; color: var(--muted); font-weight: 500; text-align: center; }
.vt-q-mean { font-size: 20px; font-weight: 700; text-align: center; }
.vt-options { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px; width: 100%; }
.vt-opt { padding: 12px 16px; border-radius: 12px; font-size: 15px; font-weight: 500; text-align: left;
  border: 1.5px solid var(--border); background: var(--panel); color: var(--text); cursor: pointer; transition: all .15s; }
.vt-opt:hover:not(.disabled) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 7%, transparent); }
.vt-opt.disabled { cursor: default; }
.vt-opt.ok { border-color: var(--ok); background: var(--ok-bg); color: var(--ok); font-weight: 700; }
.vt-opt.bad { border-color: var(--bad); background: var(--bad-bg); color: var(--bad); }
.vt-play { padding: 10px 20px; border-radius: 12px; font-weight: 700; font-size: 15px; cursor: pointer;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; border: none; box-shadow: 0 4px 12px rgba(0,0,0,.12); }
.vt-play:hover { transform: translateY(-2px); }
.vt-fb { width: 100%; display: flex; flex-direction: column; gap: 10px; align-items: center; }
.vt-fb-line { font-weight: 600; font-size: 15px; text-align: center; }
.vt-fb-line.ok { color: var(--ok); }
.vt-fb-line.bad { color: var(--bad); }

/* Progress + result */
.vt-progress { display: flex; align-items: center; gap: 12px; width: 100%; font-size: 13px; font-weight: 700; color: var(--muted); }
.vt-progress .bar { flex: 1; }
.vt-score { color: var(--warn); }
.vt-result { text-align: center; display: grid; gap: 10px; justify-items: center; padding: 24px 0; }
.vt-result-emoji { font-size: 48px; }

/* Spell */
.vt-spell-clue { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; justify-content: center; }
.vt-boxes { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.vt-box { width: 34px; height: 42px; border-radius: 8px; display: grid; place-items: center; font-size: 19px; font-weight: 800;
  text-transform: lowercase; background: var(--panel-2); border: 1.5px solid var(--border-2); border-bottom-width: 3px; }
.vt-box.filled { cursor: pointer; border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.vt-box.revealed { background: color-mix(in srgb, var(--pc) 16%, transparent); border-color: var(--pc); color: var(--pc); }
.vt-box.ok { border-color: var(--ok); background: var(--ok-bg); color: var(--ok); }
.vt-box.bad { border-color: var(--bad); background: var(--bad-bg); color: var(--bad); }
.vt-sep { width: 14px; display: inline-block; }
.vt-bank { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.vt-tile { width: 38px; height: 44px; border-radius: 10px; font-size: 18px; font-weight: 800; text-transform: lowercase;
  background: var(--panel); border: 1.5px solid var(--border-2); border-bottom-width: 3px; cursor: pointer; transition: all .12s; }
.vt-tile:hover { transform: translateY(-2px); border-color: var(--accent); }
.vt-spell-ctrl { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
@media (max-width: 560px) {
  .vt-match { grid-template-columns: 1fr 1fr; }
  .vt-img.quiz { width: 130px; height: 98px; }
}

/* Emoji illustration tile (ảnh minh hoạ cục bộ, offline) */
.vt-emoji-tile {
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 16%, var(--panel-2)), var(--panel-2));
  border-color: color-mix(in srgb, var(--accent) 20%, var(--border));
}
.vt-emoji { font-size: 54px; line-height: 1; filter: drop-shadow(0 2px 3px rgba(0,0,0,.12)); }
.vt-img.sm .vt-emoji { font-size: 50px; }
.vt-img.flash .vt-emoji { font-size: 66px; }
.vt-img.quiz .vt-emoji { font-size: 58px; }

/* Pictogram cục bộ phủ lên ô emoji (emoji là fallback khi thiếu file ảnh) */
.vt-img { position: relative; }
.vt-photo { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; background: #fff; }
.vt-credit { font-size: 11px; color: var(--dim); text-align: center; margin-top: 6px; }

/* ==========================================================================
   IPA Chart Styles - Bảng Phiên Âm Quốc Tế
   ========================================================================== */

.ipa-chart-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.ipa-section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
}

.ipa-section-header {
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.ipa-section-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 0.5rem 0;
}

.ipa-section-desc {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0;
}

.ipa-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.ipa-grid-consonants {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.ipa-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.ipa-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  border-color: var(--accent);
}

.ipa-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ipa-symbol {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  font-family: 'Segoe UI', 'Arial Unicode MS', sans-serif;
  line-height: 1;
}

.ipa-speaker {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--accent);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.ipa-speaker svg {
  width: 20px;
  height: 20px;
  stroke: white;
}

.ipa-speaker:hover {
  transform: scale(1.08);
  background: color-mix(in srgb, var(--accent) 85%, black);
}

.ipa-speaker:active {
  transform: scale(0.95);
}

.ipa-card-example {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.ipa-word {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

.ipa-transcription {
  font-size: 0.9rem;
  color: var(--muted);
  font-family: 'Segoe UI', 'Arial Unicode MS', sans-serif;
}

.ipa-badges {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.ipa-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.ipa-badge.voiced {
  background: color-mix(in srgb, #10b981 15%, var(--bg-2));
  color: #10b981;
}

.ipa-badge.unvoiced {
  background: color-mix(in srgb, #f59e0b 15%, var(--bg-2));
  color: #d97706;
}

.ipa-badge.type-long {
  background: color-mix(in srgb, #3b82f6 15%, var(--bg-2));
  color: #3b82f6;
}

.ipa-badge.type-short {
  background: color-mix(in srgb, #8b5cf6 15%, var(--bg-2));
  color: #8b5cf6;
}

.ipa-badge.type-closing {
  background: color-mix(in srgb, #06b6d4 15%, var(--bg-2));
  color: #06b6d4;
}

.ipa-badge.type-centering {
  background: color-mix(in srgb, #ec4899 15%, var(--bg-2));
  color: #ec4899;
}

.ipa-badge.type-plosive {
  background: color-mix(in srgb, #ef4444 15%, var(--bg-2));
  color: #ef4444;
}

.ipa-badge.type-fricative {
  background: color-mix(in srgb, #f97316 15%, var(--bg-2));
  color: #f97316;
}

.ipa-badge.type-affricate {
  background: color-mix(in srgb, #eab308 15%, var(--bg-2));
  color: #ca8a04;
}

.ipa-badge.type-nasal {
  background: color-mix(in srgb, #22c55e 15%, var(--bg-2));
  color: #22c55e;
}

.ipa-badge.type-approximant {
  background: color-mix(in srgb, #6366f1 15%, var(--bg-2));
  color: #6366f1;
}

.ipa-tip {
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.5;
  margin: 0;
  padding-top: 0.5rem;
  border-top: 1px dashed var(--border);
}

/* IPA Guide Section */
.ipa-guide {
  background: var(--panel);
}

.ipa-guide h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--text);
}

.ipa-guide-content {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.ipa-guide-item {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--bg-2);
  border-radius: 10px;
  border: 1px solid var(--border);
}

.ipa-guide-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.ipa-guide-item strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.ipa-guide-item p {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.5;
}

/* Speaker button (reusable) */
.speaker-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, background-color 0.15s ease;
  flex-shrink: 0;
}

.speaker-btn svg {
  width: 18px;
  height: 18px;
  stroke: white;
}

.speaker-btn:hover {
  transform: scale(1.08);
  background: color-mix(in srgb, var(--accent) 85%, black);
}

.speaker-btn:active {
  transform: scale(0.95);
}

/* IPA Chart Responsive */
@media (max-width: 768px) {
  .ipa-section {
    padding: 1rem;
  }

  .ipa-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.75rem;
  }

  .ipa-grid-consonants {
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  }

  .ipa-card {
    padding: 0.875rem;
  }

  .ipa-symbol {
    font-size: 1.5rem;
  }

  .ipa-speaker {
    width: 36px;
    height: 36px;
  }

  .ipa-speaker svg {
    width: 18px;
    height: 18px;
  }

  .ipa-guide-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .ipa-grid {
    grid-template-columns: 1fr 1fr;
  }

  .ipa-grid-consonants {
    grid-template-columns: 1fr 1fr;
  }

  .ipa-section-header h2 {
    font-size: 1.1rem;
  }
}

/* =========================================================
   HỘI THOẠI / NGHE / NÓI (giao diện chung sau chuẩn hoá)
   ========================================================= */
.kx-card { margin-bottom: 18px; display: grid; gap: 14px; }
.kx-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; flex-wrap: wrap; }
.kx-head h3 { margin-top: 8px; font-size: 18px; color: var(--text); }
.kx-head p { margin-top: 2px; }
.kx-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.kx-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.kx-block { padding: 14px 16px; border-radius: 14px; background: var(--panel-2); border: 1px solid var(--border); display: grid; gap: 8px; }
.kx-block > b, .kx-block > summary, .kx-row > b { color: var(--text); font-size: 14px; }
.kx-block > summary { cursor: pointer; font-weight: 700; }
.kx-list { padding-left: 20px; display: grid; gap: 6px; font-size: 14px; line-height: 1.6; }
.kx-steps { padding-left: 22px; display: grid; gap: 4px; font-size: 14px; color: var(--muted); }
.kx-qa { padding-left: 22px; display: grid; gap: 12px; font-size: 14.5px; }
.kx-qa li > .btn { margin-top: 6px; }
.kx-ans { margin-top: 6px; padding: 8px 12px; border-radius: 10px; background: var(--ok-bg); }
.kx-card .say { width: 30px; height: 30px; border-radius: 9px; font-size: 14px; }

/* Hội thoại */
.dlg-lines { display: grid; gap: 10px; padding: 14px; border-radius: 14px; background: var(--panel-2); border: 1px solid var(--border); }
.dlg-line { display: flex; gap: 10px; align-items: flex-start; max-width: 88%; }
.dlg-line.is-b { margin-left: auto; flex-direction: row-reverse; }
.dlg-avatar { width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0; display: grid; place-items: center; font-weight: 800; color: #fff; background: var(--accent); }
.dlg-line.is-b .dlg-avatar { background: var(--ok); }
.dlg-bubble { padding: 10px 14px; border-radius: 14px; background: var(--panel); border: 1px solid var(--border); display: grid; gap: 4px; }
.dlg-line.is-b .dlg-bubble { background: color-mix(in srgb, var(--ok) 8%, var(--panel)); }
.dlg-who { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.dlg-en { font-size: 15.5px; color: var(--text); line-height: 1.55; }
.dlg-vi { font-size: 13.5px; color: var(--muted); font-style: italic; }
.dlg-note { font-size: 12.5px; color: var(--muted); padding: 6px 10px; border-radius: 8px; background: rgba(251,191,36,.12); }
.dlg.hide-vi .dlg-vi { display: none; }

/* Bài nghe */
.lx-audio { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.lx-tip { font-size: 13px; }
.lx-script p { font-size: 14.5px; line-height: 1.7; color: var(--text); }
.lx-set .ex-form { margin-top: 4px; }
.ex-audio { display: flex; gap: 8px; margin: 6px 0 4px; }

/* Bài nói */
.sp-passage { font-size: 16px; line-height: 1.85; color: var(--text); }
.sp-ipa { font-family: ui-monospace, Menlo, monospace; font-size: 13px; color: var(--muted); line-height: 1.8; }
.sp-lines, .sp-turns { padding-left: 22px; display: grid; gap: 12px; }
.sp-lines li, .sp-turns li { padding: 10px 12px; border-radius: 12px; background: var(--panel); border: 1px solid var(--border); }
.sp-lines li.is-you { border-color: var(--ok); }
.sp-en { font-size: 15.5px; color: var(--text); }
.sp-you { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--border); color: var(--text); }
.sp-pron { display: grid; gap: 8px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.sp-pron-item { display: flex; gap: 10px; align-items: flex-start; padding: 8px 10px; border-radius: 10px; background: var(--panel); border: 1px solid var(--border); font-size: 13.5px; }
.sp-scene p { font-size: 14px; line-height: 1.6; }

/* =========================================================
   LỘ TRÌNH 60 UNIT: SIDEBAR GIAI ĐOẠN, THẺ UNIT, KHOÁ, KIỂM TRA
   ========================================================= */
button.nav-phase-t { width: 100%; background: transparent; border: 0; cursor: pointer; text-align: left; border-radius: 10px; }
button.nav-phase-t:hover { background: var(--panel); }
.nav-phase-t small { margin-left: auto; font-size: 10.5px; letter-spacing: 0; text-transform: none; font-weight: 600; color: var(--muted); }
.nav-phase-t .nw-arrow { width: 14px; height: 14px; opacity: .55; transition: transform .25s var(--ease); }
.nav-phase.open .nav-phase-t .nw-arrow { transform: rotate(180deg); }
a.nav-week-toggle { text-decoration: none; }
.nav-unit-planned { opacity: .62; }
.nav-unit-planned .nw-n { font-size: 11px; }
.nav-unit-locked .nw-n { font-size: 11px; background: transparent; }
.nw-tag { font-size: 10.5px; font-weight: 700; color: var(--muted); padding: 2px 7px; border-radius: 99px; border: 1px solid var(--border); flex-shrink: 0; }
.nav-day-test .nd-check { background: transparent; border-color: transparent; }
.nav-day-test { font-weight: 600; }

.phase-weeks { grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); }
.wcard-planned { opacity: .6; border-style: dashed; }
.wcard-planned:hover { opacity: .9; }
.wcard-locked { opacity: .8; }
.wcard-passed { border-color: color-mix(in srgb, var(--ok) 45%, var(--border)); }
.wcard-passed .wcard-top span:last-child { color: var(--ok); }
.phase-targets { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 10px; font-size: 13px; color: var(--muted); }

.unit-test-card { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; border: 1.5px solid color-mix(in srgb, var(--accent) 35%, var(--border)); }
.unit-test-card h3 { margin: 4px 0 6px; }
.unit-test-card.passed { border-color: color-mix(in srgb, var(--ok) 45%, var(--border)); }
.lock-card { display: flex; gap: 20px; align-items: flex-start; padding: 32px; }
.lock-ic { font-size: 46px; line-height: 1; }
.lock-card h1 { margin: 6px 0 10px; font-size: 26px; }

/* Từ / câu bấm để nghe trong bài giảng */
.lesson-body .sp, .grammar-body .sp {
  cursor: pointer; color: var(--accent); font-weight: 600;
  border-bottom: 1px dashed color-mix(in srgb, var(--accent) 55%, transparent);
  transition: background .15s;
  border-radius: 4px; padding: 0 2px;
}
.lesson-body .sp:hover, .grammar-body .sp:hover { background: color-mix(in srgb, var(--accent) 10%, transparent); }
.lesson-body .sp::after, .grammar-body .sp::after { content: " 🔊"; font-size: .75em; opacity: .55; }
.lesson-body .callout.tip ul, .grammar-body .callout.tip ul { color: var(--text); }