/* ═══════════════════════════════════════════════════════════════
   phat-am.css — Phát Âm & Khẩu Ngữ (S63 v2)
   Dark-first. Light mode: earthy palette (terracotta/petrol/blush/slate)
   ═══════════════════════════════════════════════════════════════ */

/* ── Earthy palette tokens (light mode) ─────────────────────── */
:root {
  --pa-terracotta: #B85C38;
  --pa-petrol:     #2E6B7A;
  --pa-blush:      #D4917A;
  --pa-slate:      #5A7070;
  --pa-cream:      #FAF7F2;
  --pa-sand:       #EDE8DF;
  --pa-ink:        #2C3830;
  --pa-ink2:       #4A5E58;
}

/* ── Layout ─────────────────────────────────────────────────── */
body {
  margin: 0; padding: 0;
  background: var(--ytt-bg-0, #0f0f12);
  color: var(--ytt-text-1, #f5f6fa);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100vh;
}
html[data-theme="light"] body {
  background: var(--pa-cream);
  color: var(--pa-ink);
}

/* ── Header & Tabs ───────────────────────────────────────────── */
.pa-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--ytt-bg-0, #0f0f12);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 10px 16px 0;
}
/* Hàng progress + help button căn hàng ngang */
.pa-header-bottom {
  display: flex; align-items: center; gap: 8px;
}
html[data-theme="light"] .pa-header {
  background: var(--pa-cream);
  border-bottom: 1px solid var(--pa-blush);
}

.pa-tabs { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.pa-tabs::-webkit-scrollbar { display: none; }

.pa-tab-btn {
  flex-shrink: 0; background: none; border: none;
  border-bottom: 2px solid transparent;
  color: var(--ytt-text-2, #a4b0be);
  padding: 8px 14px; font-size: 0.85rem; cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  display: flex; align-items: center; gap: 6px;
}
.pa-tab-btn.active {
  color: var(--ytt-accent, #d4af37);
  border-bottom-color: var(--ytt-accent, #d4af37);
  font-weight: 600;
}
html[data-theme="light"] .pa-tab-btn { color: var(--pa-ink2); }
html[data-theme="light"] .pa-tab-btn.active {
  color: var(--pa-terracotta);
  border-bottom-color: var(--pa-terracotta);
}
html[data-theme="light"] .pa-tab-btn:hover:not(.active) { color: var(--pa-ink); }
.pa-tab-btn:hover:not(.active) { color: var(--ytt-text-1, #f5f6fa); }

.pa-tab-soon { opacity: 0.6; cursor: default; }
.pa-soon-badge {
  font-size: 0.68rem; background: rgba(255,165,0,0.15);
  color: #ffb347; border-radius: 10px; padding: 1px 7px;
}
html[data-theme="light"] .pa-soon-badge {
  background: rgba(184,92,56,0.12); color: var(--pa-terracotta);
}

.pa-progress-bar {
  font-size: 0.75rem; color: var(--ytt-text-2, #a4b0be);
  padding: 6px 2px 8px; flex: 1;
}
html[data-theme="light"] .pa-progress-bar { color: var(--pa-slate); }

/* ── Help button ─────────────────────────────────────────────── */
.pa-help-btn {
  background: none; border: 1.5px solid rgba(212,175,55,0.3);
  border-radius: 50%; width: 28px; height: 28px;
  cursor: pointer; color: rgba(212,175,55,0.7); font-size: 0.85rem;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: all 0.18s; margin-bottom: 6px;
}
.pa-help-btn:hover { border-color: #d4af37; color: #d4af37; }
html[data-theme="light"] .pa-help-btn { border-color: rgba(196,98,45,0.3); color: rgba(196,98,45,0.7); }
html[data-theme="light"] .pa-help-btn:hover { border-color: #C4622D; color: #C4622D; }

/* ── Section ─────────────────────────────────────────────────── */
.pa-section { padding: 14px 16px 32px; }

.pa-section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px; gap: 12px;
}
.pa-section-title {
  margin: 0; font-size: 0.88rem; font-weight: 600;
  color: var(--ytt-text-2, #a4b0be);
  display: flex; align-items: center; gap: 8px;
}
html[data-theme="light"] .pa-section-title { color: var(--pa-ink2); }

.pa-hanzi { color: var(--ytt-accent, #d4af37); font-size: 1rem; }
html[data-theme="light"] .pa-hanzi { color: var(--pa-terracotta); }

.pa-count {
  font-size: 0.72rem; background: rgba(255,255,255,0.07);
  border-radius: 10px; padding: 1px 8px; font-weight: 400;
}
html[data-theme="light"] .pa-count {
  background: rgba(46,107,122,0.1); color: var(--pa-petrol);
}

/* ── Group headers within grid ───────────────────────────────── */
.pa-group-wrap { margin-bottom: 4px; }

.pa-group-cells {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 7px;
  padding: 4px 0 8px;
}
.pa-group-cells > .pa-cell { flex: 0 0 82px; }

.pa-group-header {
  margin: 14px 0 6px;
  padding: 10px 16px 12px;
  background: rgba(255,255,255,0.04);
  border-radius: 8px;
  border-top: 2px solid rgba(212,175,55,0.3);
  display: flex; flex-direction: column; align-items: center;
  text-align: center; gap: 3px;
}
.pa-group-header:first-child { margin-top: 0; }
html[data-theme="light"] .pa-group-header {
  background: rgba(46,107,122,0.06);
  border-top-color: var(--pa-petrol);
}

.pa-group-name {
  font-size: 0.88rem; font-weight: 700;
  color: var(--ytt-accent, #d4af37);
  letter-spacing: 0.01em;
}
html[data-theme="light"] .pa-group-name { color: var(--pa-petrol); }

.pa-group-desc {
  font-size: 0.74rem; color: var(--ytt-text-2, #a4b0be);
  line-height: 1.45; max-width: 560px;
}
html[data-theme="light"] .pa-group-desc { color: var(--pa-ink2); }

/* ── Pinyin Grid ─────────────────────────────────────────────── */
.pa-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 7px;
}
/* Shengmu grid là container cho .pa-group-wrap, không phải flex-grid */
#pa-shengmu-grid { display: block; }

.pa-grid > .pa-cell       { flex: 0 0 82px; }
.pa-grid-tones > .pa-cell { flex: 0 0 110px; }

.pa-cell {
  background: rgba(255,255,255,0.055);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 8px; padding: 10px 6px 8px;
  cursor: pointer; text-align: center;
  transition: background 0.18s, transform 0.15s, box-shadow 0.18s;
  position: relative; min-height: 64px;
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 2px;
}
.pa-cell:hover {
  background: rgba(255,255,255,0.10);
  transform: scale(1.04);
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
.pa-cell:active { transform: scale(0.97); }
.pa-cell.played {
  border-color: rgba(212,175,55,0.35);
  background: rgba(212,175,55,0.07);
}

html[data-theme="light"] .pa-cell {
  background: #fff;
  border: 1px solid var(--pa-sand);
  box-shadow: 0 1px 3px rgba(44,56,48,0.06);
}
html[data-theme="light"] .pa-cell:hover {
  background: rgba(212,180,160,0.15);
  border-color: var(--pa-blush);
  box-shadow: 0 3px 10px rgba(184,92,56,0.12);
  transform: scale(1.04);
}
html[data-theme="light"] .pa-cell.played {
  border-color: var(--pa-terracotta);
  background: rgba(184,92,56,0.07);
}

.pa-cell-py {
  font-size: 1.25rem; font-weight: 800;
  color: var(--ytt-text-1, #f5f6fa); letter-spacing: 0.01em;
  text-align: center;
}
html[data-theme="light"] .pa-cell-py { color: #1a1f1d; font-size: 1.45rem; }

.pa-cell-ipa {
  font-size: 0.65rem; color: var(--ytt-text-2, #a4b0be);
  font-family: 'Courier New', monospace; text-align: center;
}
html[data-theme="light"] .pa-cell-ipa { color: var(--pa-slate); }

.pa-cell-demo {
  font-size: 0.72rem; font-weight: 600;
  color: rgba(212,175,55,0.8); margin-top: 1px; text-align: center;
}
html[data-theme="light"] .pa-cell-demo { color: var(--pa-terracotta); }

.pa-cell-standalone {
  font-size: 0.7rem; font-weight: 600;
  color: rgba(46,200,180,0.8); margin-top: 1px; text-align: center;
}
html[data-theme="light"] .pa-cell-standalone { color: var(--pa-petrol); }

/* ── Group-based cell colors (dark mode: subtle tints) ─────── */
.pa-cell[data-group="labial"]    { background: rgba(212,120,90,0.10);  border-color: rgba(212,120,90,0.22); }
.pa-cell[data-group="alveolar"]  { background: rgba(200,165,100,0.09); border-color: rgba(200,165,100,0.20); }
.pa-cell[data-group="velar"]     { background: rgba(46,140,160,0.10);  border-color: rgba(46,140,160,0.22); }
.pa-cell[data-group="palatal"]   { background: rgba(190,90,50,0.11);   border-color: rgba(190,90,50,0.24); }
.pa-cell[data-group="retroflex"] { background: rgba(200,70,60,0.10);   border-color: rgba(200,70,60,0.22); }
.pa-cell[data-group="sibilant"]  { background: rgba(90,130,120,0.09);  border-color: rgba(90,130,120,0.20); }

/* ── Group-based cell colors (light mode: earthy, more vibrant) ─ */
html[data-theme="light"] .pa-cell[data-group="labial"]    { background: rgba(212,145,122,0.22); border-color: rgba(184,92,56,0.40); }
html[data-theme="light"] .pa-cell[data-group="alveolar"]  { background: rgba(195,165,120,0.20); border-color: rgba(160,125,80,0.38); }
html[data-theme="light"] .pa-cell[data-group="velar"]     { background: rgba(46,107,122,0.15);  border-color: rgba(46,107,122,0.38); }
html[data-theme="light"] .pa-cell[data-group="palatal"]   { background: rgba(184,80,50,0.14);   border-color: rgba(184,80,50,0.40); }
html[data-theme="light"] .pa-cell[data-group="retroflex"] { background: rgba(185,60,45,0.13);   border-color: rgba(185,60,45,0.38); }
html[data-theme="light"] .pa-cell[data-group="sibilant"]  { background: rgba(90,112,112,0.16);  border-color: rgba(90,112,112,0.38); }

/* Played state override: luôn nổi bật hơn group color — border 2px vàng */
.pa-cell.played,
.pa-cell[data-group].played { border: 2px solid rgba(212,175,55,0.55); }
html[data-theme="light"] .pa-cell.played,
html[data-theme="light"] .pa-cell[data-group].played { border: 2px solid var(--pa-terracotta); }

/* Bẫy người Việt indicator */
.pa-cell[data-trap="1"]::after {
  content: ''; position: absolute; top: 5px; right: 5px;
  width: 6px; height: 6px; border-radius: 50%;
  background: #ef5350; box-shadow: 0 0 4px rgba(239,83,80,0.5);
}

/* Aspirated tag */
.pa-cell-tag {
  font-size: 0.58rem; border-radius: 4px; padding: 0 4px; margin-top: 1px;
  font-weight: 600; letter-spacing: 0.03em;
}
.pa-cell-tag.asp {
  background: rgba(100,180,255,0.15); color: rgba(100,200,255,0.85);
}
.pa-cell-tag.nasal {
  background: rgba(180,130,255,0.12); color: rgba(180,150,255,0.85);
}
html[data-theme="light"] .pa-cell-tag.asp {
  background: rgba(46,107,122,0.12); color: var(--pa-petrol);
}
html[data-theme="light"] .pa-cell-tag.nasal {
  background: rgba(90,112,112,0.1); color: var(--pa-slate);
}

/* Tone cells */
.pa-cell-tone-mark {
  font-size: 1.3rem; font-weight: 700; color: var(--ytt-accent, #d4af37);
}
html[data-theme="light"] .pa-cell-tone-mark { color: var(--pa-terracotta); }

.pa-cell-tone-name {
  font-size: 0.66rem; color: var(--ytt-text-2, #a4b0be);
  text-align: center; line-height: 1.3;
}
html[data-theme="light"] .pa-cell-tone-name { color: var(--pa-ink2); }

/* ── Tooltip ─────────────────────────────────────────────────── */
.pa-tooltip {
  position: fixed; z-index: 9000;
  background: var(--ytt-bg-1, #131318);
  border: 1px solid rgba(212,175,55,0.35);
  border-radius: 10px; padding: 12px 14px; max-width: 280px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  pointer-events: auto; /* Cho phép select text, scroll trong tooltip */
  transition: opacity 0.15s; user-select: text;
}
html[data-theme="light"] .pa-tooltip {
  background: #fff;
  border: 1px solid var(--pa-blush);
  box-shadow: 0 4px 20px rgba(44,56,48,0.15);
}

.pa-tt-py {
  font-size: 1.15rem; font-weight: 700;
  color: var(--ytt-accent, #d4af37); margin-bottom: 5px;
}
html[data-theme="light"] .pa-tt-py { color: var(--pa-terracotta); }

.pa-tt-hint {
  font-size: 0.78rem; color: var(--ytt-text-1, #f5f6fa);
  line-height: 1.55; margin-bottom: 6px; white-space: pre-line;
}
html[data-theme="light"] .pa-tt-hint { color: var(--pa-ink); }

.pa-tt-mnemonic {
  font-size: 0.74rem; font-style: italic;
  color: rgba(212,175,55,0.8);
  background: rgba(212,175,55,0.07);
  border-radius: 5px; padding: 4px 8px; margin-bottom: 6px;
}
html[data-theme="light"] .pa-tt-mnemonic {
  color: var(--pa-terracotta);
  background: rgba(184,92,56,0.08);
}

.pa-tt-trap {
  font-size: 0.74rem; color: #ef5350;
  font-weight: 600; margin-bottom: 5px;
}
.pa-tt-note {
  font-size: 0.72rem; color: rgba(100,200,255,0.8);
  margin-bottom: 5px;
}
html[data-theme="light"] .pa-tt-note { color: var(--pa-petrol); }

.pa-tt-example {
  font-size: 0.76rem; color: var(--ytt-text-2, #a4b0be);
  border-top: 1px solid rgba(255,255,255,0.06); padding-top: 6px;
}
html[data-theme="light"] .pa-tt-example {
  color: var(--pa-ink2); border-top-color: var(--pa-sand);
}
.pa-tt-example .pa-tt-hanzi {
  font-size: 1.05rem; color: var(--ytt-text-1, #f5f6fa); margin-right: 5px;
}
html[data-theme="light"] .pa-tt-example .pa-tt-hanzi { color: var(--pa-ink); }

/* ── Legend ──────────────────────────────────────────────────── */
.pa-trap-legend {
  display: flex; align-items: center; gap: 8px;
  margin-top: 20px; font-size: 0.75rem;
  color: var(--ytt-text-2, #a4b0be);
}
html[data-theme="light"] .pa-trap-legend { color: var(--pa-ink2); }

.pa-trap-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #ef5350; flex-shrink: 0;
}

/* ── Quiz Start Button ───────────────────────────────────────── */
.pa-quiz-start-btn {
  background: linear-gradient(135deg, rgba(212,175,55,0.15), rgba(212,175,55,0.08));
  border: 1px solid rgba(212,175,55,0.4);
  color: var(--ytt-accent, #d4af37);
  border-radius: 8px; padding: 7px 14px; font-size: 0.82rem;
  cursor: pointer; display: flex; align-items: center; gap: 7px;
  font-weight: 600; transition: background 0.2s; white-space: nowrap;
}
.pa-quiz-start-btn:hover {
  background: linear-gradient(135deg, rgba(212,175,55,0.22), rgba(212,175,55,0.12));
  border-color: rgba(212,175,55,0.7);
}
html[data-theme="light"] .pa-quiz-start-btn {
  background: rgba(184,92,56,0.1); border-color: var(--pa-terracotta);
  color: var(--pa-terracotta);
}
html[data-theme="light"] .pa-quiz-start-btn:hover {
  background: rgba(184,92,56,0.18);
}

/* ── Quiz Overlay ────────────────────────────────────────────── */
.pa-quiz-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.82); z-index: 10000;
  display: flex; align-items: center; justify-content: center; padding: 16px;
}
.pa-quiz-overlay[hidden] { display: none; }

.pa-quiz-card {
  background: var(--ytt-bg-1, #131318);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px; width: 100%; max-width: 440px;
  padding: 24px 20px 20px; position: relative;
}
html[data-theme="light"] .pa-quiz-card {
  background: #fff; border-color: var(--pa-sand);
  box-shadow: 0 8px 32px rgba(44,56,48,0.15);
}

.pa-quiz-close {
  position: absolute; top: 14px; right: 14px;
  background: none; border: none; color: var(--ytt-text-2, #a4b0be);
  font-size: 1.1rem; cursor: pointer; padding: 4px;
}
html[data-theme="light"] .pa-quiz-close { color: var(--pa-ink2); }

.pa-quiz-progress-bar-fill {
  height: 4px; background: var(--ytt-accent, #d4af37);
  border-radius: 2px; transition: width 0.3s ease; margin-bottom: 14px;
}
html[data-theme="light"] .pa-quiz-progress-bar-fill { background: var(--pa-terracotta); }

.pa-quiz-counter {
  font-size: 0.8rem; color: var(--ytt-text-2, #a4b0be); margin-bottom: 16px;
}
html[data-theme="light"] .pa-quiz-counter { color: var(--pa-ink2); }

.pa-quiz-question { text-align: center; margin-bottom: 20px; }

.pa-quiz-play-btn {
  background: linear-gradient(135deg, rgba(212,175,55,0.2), rgba(212,175,55,0.1));
  border: 2px solid rgba(212,175,55,0.5);
  color: var(--ytt-accent, #d4af37);
  border-radius: 50px; padding: 14px 28px;
  font-size: 1rem; font-weight: 700; cursor: pointer; transition: all 0.2s;
}
.pa-quiz-play-btn:hover {
  background: linear-gradient(135deg, rgba(212,175,55,0.3), rgba(212,175,55,0.18));
  transform: scale(1.03);
}
html[data-theme="light"] .pa-quiz-play-btn {
  background: rgba(184,92,56,0.1); border-color: var(--pa-terracotta);
  color: var(--pa-terracotta);
}

.pa-quiz-choices {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
}
/* 4 màu nền rõ ràng cho 4 lựa chọn */
.pa-quiz-choice {
  border: none; border-radius: 14px; padding: 18px 12px;
  font-size: 1.15rem; font-weight: 700; letter-spacing: 0.01em;
  color: #fff; cursor: pointer; transition: filter 0.15s, transform 0.1s;
  text-align: center; line-height: 1.3;
}
.pa-quiz-choice:nth-child(1) { background: #b85c38; }
.pa-quiz-choice:nth-child(2) { background: #2e7d8c; }
.pa-quiz-choice:nth-child(3) { background: #7b5c2e; }
.pa-quiz-choice:nth-child(4) { background: #4a7a4a; }
.pa-quiz-choice:hover:not(:disabled) { filter: brightness(1.15); transform: translateY(-1px); }
.pa-quiz-choice:active:not(:disabled) { transform: translateY(0); }
.pa-quiz-choice:disabled { opacity: 0.7; cursor: default; transform: none; }
.pa-quiz-choice.correct { background: #2e7d32 !important; box-shadow: 0 0 0 3px #81c784; }
.pa-quiz-choice.wrong   { background: #c62828 !important; box-shadow: 0 0 0 3px #e57373; }
/* Quiz subtitle (loại câu hỏi) */
.pa-quiz-qtype {
  font-size: 0.78rem; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ytt-text-2, #a4b0be); margin-bottom: 6px; text-align: center;
}
html[data-theme="light"] .pa-quiz-qtype { color: #888; }
html[data-theme="light"] .pa-quiz-choice { color: #fff; }
html[data-theme="light"] .pa-quiz-choice.correct { background: #2e7d32 !important; color: #fff; }
html[data-theme="light"] .pa-quiz-choice.wrong   { background: #c62828 !important; color: #fff; }

.pa-quiz-result { text-align: center; padding: 16px 0 0; }
.pa-quiz-score  { font-size: 2rem; font-weight: 800; color: var(--ytt-accent, #d4af37); }
html[data-theme="light"] .pa-quiz-score { color: var(--pa-terracotta); }

.pa-quiz-msg {
  font-size: 0.9rem; color: var(--ytt-text-1, #f5f6fa); margin: 8px 0 16px;
}
html[data-theme="light"] .pa-quiz-msg { color: var(--pa-ink); }

.pa-quiz-again-btn {
  background: linear-gradient(135deg, rgba(212,175,55,0.2), rgba(212,175,55,0.08));
  border: 1px solid rgba(212,175,55,0.4);
  color: var(--ytt-accent, #d4af37);
  border-radius: 8px; padding: 9px 20px;
  font-size: 0.88rem; font-weight: 600; cursor: pointer; margin-right: 8px;
}
html[data-theme="light"] .pa-quiz-again-btn {
  background: rgba(184,92,56,0.1); border-color: var(--pa-terracotta); color: var(--pa-terracotta);
}

/* ── Coming Soon ─────────────────────────────────────────────── */
.pa-coming-soon {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; padding: 60px 20px; text-align: center;
  color: var(--ytt-text-2, #a4b0be);
}
html[data-theme="light"] .pa-coming-soon { color: var(--pa-ink2); }
.pa-coming-icon { font-size: 3rem; margin-bottom: 14px; }
.pa-coming-soon h3 { color: var(--ytt-text-1, #f5f6fa); margin: 0 0 10px; }
html[data-theme="light"] .pa-coming-soon h3 { color: var(--pa-ink); }
.pa-coming-soon p { font-size: 0.88rem; max-width: 300px; }

/* ── Mobile ──────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .pa-grid { gap: 5px; }
  .pa-grid > .pa-cell       { flex: 0 0 68px; }
  .pa-grid-tones > .pa-cell { flex: 0 0 90px; }
  .pa-group-cells { gap: 5px; }
  .pa-group-cells > .pa-cell { flex: 0 0 68px; }
  .pa-cell { min-height: 50px; padding: 8px 4px 6px; }
  .pa-cell-py { font-size: 0.95rem; }
  .pa-quiz-card { padding: 16px 14px 16px; }
}

/* ═══════════════════════════════════════════════════════════════
   BẢNG GHÉP ÂM NÂNG CAO
   ═══════════════════════════════════════════════════════════════ */

/* Nhóm actions cạnh quiz-btn để đặt advanced-btn sát nhau */
.pa-section-header-actions {
  display: flex; align-items: center; gap: 8px; flex-shrink: 0;
}

/* Nút "Nâng cao" — viền gold nhạt, nhỏ hơn quiz-btn */
.pa-advanced-btn {
  background: rgba(212,175,55,0.07);
  border: 1px solid rgba(212,175,55,0.32);
  color: rgba(212,175,55,0.75);
  border-radius: 8px; padding: 6px 12px; font-size: 0.80rem;
  cursor: pointer; display: flex; align-items: center; gap: 6px;
  font-weight: 600; transition: all 0.18s; white-space: nowrap;
}
.pa-advanced-btn:hover {
  background: rgba(212,175,55,0.15);
  border-color: rgba(212,175,55,0.6);
  color: var(--ytt-accent, #d4af37);
}
/* Trạng thái active (bảng đang hiển thị) */
.pa-advanced-btn.active {
  background: rgba(212,175,55,0.18);
  border-color: rgba(212,175,55,0.7);
  color: var(--ytt-accent, #d4af37);
}
html[data-theme="light"] .pa-advanced-btn {
  background: rgba(184,92,56,0.07);
  border-color: rgba(184,92,56,0.35);
  color: rgba(184,92,56,0.75);
}
html[data-theme="light"] .pa-advanced-btn:hover,
html[data-theme="light"] .pa-advanced-btn.active {
  background: rgba(184,92,56,0.14);
  border-color: var(--pa-terracotta);
  color: var(--pa-terracotta);
}

/* Section bảng nâng cao */
.pa-adv-section {
  padding: 16px 16px 40px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
html[data-theme="light"] .pa-adv-section {
  border-top-color: var(--pa-sand);
}

/* Tiêu đề section */
.pa-adv-title {
  margin: 0 0 6px;
  font-size: 1rem; font-weight: 700;
  color: var(--ytt-accent, #d4af37);
  display: flex; align-items: center; gap: 8px;
}
html[data-theme="light"] .pa-adv-title { color: var(--pa-petrol); }

.pa-adv-subtitle {
  margin: 0 0 20px;
  font-size: 0.78rem; color: var(--ytt-text-2, #a4b0be);
  line-height: 1.5;
}
html[data-theme="light"] .pa-adv-subtitle { color: var(--pa-ink2); }

/* Wrapper mỗi bảng */
.pa-adv-table-wrap {
  margin-bottom: 28px;
}

/* Tiêu đề mỗi bảng con */
.pa-adv-table-title {
  margin: 0 0 10px;
  font-size: 0.84rem; font-weight: 600;
  color: var(--ytt-text-2, #a4b0be);
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}
html[data-theme="light"] .pa-adv-table-title {
  color: var(--pa-ink2);
  border-bottom-color: var(--pa-sand);
}

/* Scroll container — overflow-x để mobile không bị vỡ layout */
.pa-adv-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.08);
}
html[data-theme="light"] .pa-adv-scroll {
  border-color: var(--pa-sand);
}

/* Table chính */
.pa-adv-table {
  border-collapse: collapse;
  min-width: max-content; /* ngăn bảng co lại trên mobile — dùng scroll thay */
  width: 100%;
  font-size: 0.80rem;
}

/* Header cells — vàng nhạt */
.pa-adv-th {
  background: rgba(212,175,55,0.12);
  color: var(--ytt-accent, #d4af37);
  font-weight: 700; font-size: 0.75rem;
  padding: 6px 8px; text-align: center;
  border: 1px solid rgba(212,175,55,0.15);
  white-space: nowrap;
  position: sticky; top: 0; /* sticky header khi scroll dọc */
}
html[data-theme="light"] .pa-adv-th {
  background: rgba(46,107,122,0.12);
  color: var(--pa-petrol);
  border-color: rgba(46,107,122,0.20);
}

/* Header cột đầu tiên (initial) — khác màu, sticky */
.pa-adv-th-init {
  background: rgba(255,255,255,0.06);
  color: var(--ytt-text-1, #f5f6fa);
  font-size: 0.82rem; letter-spacing: 0.02em;
  position: sticky; left: 0; z-index: 2;
  min-width: 36px;
}
html[data-theme="light"] .pa-adv-th-init {
  background: rgba(90,112,112,0.12);
  color: var(--pa-ink);
}

/* Cell thông thường — có thể click */
.pa-adv-cell {
  padding: 7px 9px; text-align: center;
  border: 1px solid rgba(255,255,255,0.06);
  color: var(--ytt-text-1, #f5f6fa);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
  min-width: 46px;
  font-size: 0.96rem;  /* tăng từ 0.78 → dễ đọc hơn */
}

/* ── Tone selector buttons ───────────────────────────────── */
.pa-adv-tone-row {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin: 14px 0 6px;
}
.pa-adv-tone-label { font-size: 0.78rem; color: var(--ytt-text-2,#a4b0be); flex-shrink:0; }
.pa-adv-tone-btn {
  padding: 5px 14px; border-radius: 16px;
  border: 1.5px solid rgba(212,175,55,0.3);
  background: rgba(212,175,55,0.06);
  color: rgba(212,175,55,0.7);
  font-size: 0.85rem; font-weight: 600; cursor: pointer;
  transition: all 0.18s;
}
.pa-adv-tone-btn:hover { border-color: rgba(212,175,55,0.6); color: #d4af37; background: rgba(212,175,55,0.14); }
.pa-adv-tone-btn.active { border-color: #d4af37; color: #ffd700; background: rgba(212,175,55,0.2); }
html[data-theme="light"] .pa-adv-tone-btn { border-color: rgba(196,98,45,0.3); color: rgba(196,98,45,0.7); background: rgba(196,98,45,0.05); }
html[data-theme="light"] .pa-adv-tone-btn:hover { border-color: var(--pa-terracotta); color: var(--pa-terracotta); }
html[data-theme="light"] .pa-adv-tone-btn.active { border-color: var(--pa-terracotta); color: var(--pa-terracotta); background: rgba(196,98,45,0.12); }
html[data-theme="light"] .pa-adv-tone-label { color: var(--pa-ink2); }
.pa-adv-cell:hover {
  background: rgba(212,175,55,0.18);
  color: var(--ytt-accent, #d4af37);
  border-color: rgba(212,175,55,0.3);
}
html[data-theme="light"] .pa-adv-cell {
  color: var(--pa-ink);
  border-color: rgba(90,112,112,0.12);
}
html[data-theme="light"] .pa-adv-cell:hover {
  background: rgba(184,92,56,0.12);
  color: var(--pa-terracotta);
  border-color: rgba(184,92,56,0.25);
}

/* Cell rỗng — không có tổ hợp hợp lệ → màu xám, không pointer */
.pa-adv-cell:empty {
  background: rgba(255,255,255,0.025);
  cursor: default;
}
html[data-theme="light"] .pa-adv-cell:empty {
  background: rgba(90,112,112,0.06);
}

/* Hiệu ứng khi đang phát âm */
.pa-adv-cell--playing {
  background: rgba(212,175,55,0.28) !important;
  color: var(--ytt-accent, #d4af37) !important;
}
html[data-theme="light"] .pa-adv-cell--playing {
  background: rgba(184,92,56,0.22) !important;
  color: var(--pa-terracotta) !important;
}

/* Row chẵn/lẻ — xen kẽ màu nền để dễ đọc */
.pa-adv-table tbody tr:nth-child(even) .pa-adv-cell:not(:empty) {
  background: rgba(255,255,255,0.03);
}
html[data-theme="light"] .pa-adv-table tbody tr:nth-child(even) .pa-adv-cell:not(:empty) {
  background: rgba(90,112,112,0.04);
}

/* Mobile: giảm padding và font nhỏ hơn */
@media (max-width: 600px) {
  .pa-adv-section { padding: 12px 10px 28px; }
  .pa-adv-th, .pa-adv-cell { padding: 5px 5px; font-size: 0.72rem; }
  .pa-adv-th-init { min-width: 28px; }
  .pa-section-header-actions { gap: 6px; }
  .pa-advanced-btn { padding: 5px 9px; font-size: 0.76rem; }
}