@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&family=Noto+Serif+SC:wght@400;700&family=Inter:ital,wght@0,400;0,500;1,400&display=swap');

:root {
  /* 朱砂 Cinnabar — used sparingly: CTAs, pinyin, tone marks */
  --primary: #C0392B;
  /* 靛青 Indigo — main dark backgrounds: topbar, hero, footer */
  --primary-dark: #1C2A44;
  /* 松石绿 Jade turquoise — secondary accent throughout UI */
  --jade: #2E7A6E;
  --jade-muted: rgba(46,122,110,.1);
  /* 石青 Stone blue — HSK labels, secondary links */
  --stone: #2D5A8E;
  --gold: #D4AF37;
  --gold-light: #F5D97A;
  --rice: #FDF6E3;
  --ivory: #FFF8E7;
  --ink: #1A0A00;
  --muted: #6B4423;
  --gold-border: rgba(212,175,55,0.25);
}

*{box-sizing:border-box;margin:0;padding:0}

body{font-family:'Noto Sans SC',sans-serif;background:var(--rice);color:var(--ink);line-height:1.65}

/* ── TOPBAR ── */
.topbar{background:var(--primary-dark);border-bottom:1px solid var(--gold-border);position:sticky;top:0;z-index:100;height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 2rem}
.topbar-logo{font-family:'Noto Serif SC',serif;font-size:1.5rem;font-weight:700;color:var(--gold);text-decoration:none;letter-spacing:.05em;display:flex;align-items:center;gap:.5rem}
.topbar-logo span{font-size:1rem;opacity:.85}
.topbar-nav{display:flex;gap:1.75rem}
.topbar-nav a{color:rgba(212,175,55,.75);text-decoration:none;font-weight:500;font-size:.95rem;transition:color .2s;position:relative;padding-bottom:2px}
.topbar-nav a:hover,.topbar-nav a.active{color:var(--gold)}
.topbar-nav a.active::after{content:'';position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--gold);border-radius:1px}
.lang-switcher{display:flex;gap:.2rem}
.lang-btn{background:none;border:none;color:rgba(212,175,55,.55);font-weight:700;font-size:.8rem;padding:.25rem .5rem;border-radius:4px;cursor:pointer;transition:all .2s}
.lang-btn:hover,.lang-btn.active{background:var(--gold);color:var(--ink)}
.mobile-menu-btn{display:none;background:none;border:none;color:var(--gold);font-size:1.5rem;cursor:pointer}

/* ── HERO ── */
.hero{background:var(--primary-dark);position:relative;overflow:hidden;padding:6rem 2rem;text-align:center}
.hero::before{content:'';position:absolute;inset:0;background-image:radial-gradient(circle at 15% 50%,rgba(212,175,55,.07) 2px,transparent 2px),radial-gradient(circle at 85% 20%,rgba(212,175,55,.07) 2px,transparent 2px),radial-gradient(circle at 50% 80%,rgba(212,175,55,.05) 1px,transparent 1px);background-size:70px 70px,90px 90px,50px 50px}
.hero::after{content:'龍';position:absolute;right:-2rem;top:50%;transform:translateY(-50%);font-family:'Noto Serif SC',serif;font-size:20rem;color:rgba(212,175,55,.04);line-height:1;pointer-events:none}
.hero-content{position:relative;max-width:820px;margin:0 auto}
.hero-eyebrow{color:rgba(212,175,55,.55);font-family:'Noto Serif SC',serif;letter-spacing:.4em;font-size:.9rem;text-transform:uppercase;margin-bottom:1.25rem}
.hero-title{font-family:'Noto Serif SC',serif;font-size:clamp(4.5rem,14vw,9rem);font-weight:700;color:var(--gold);line-height:1;margin-bottom:1.5rem;text-shadow:0 0 60px rgba(212,175,55,.2)}
.hero-subtitle{color:rgba(212,175,55,.8);font-size:1.35rem;margin-bottom:2.75rem;max-width:600px;margin-left:auto;margin-right:auto}
.hero-stats{display:flex;justify-content:center;gap:3.5rem;margin-top:3.5rem;flex-wrap:wrap}
.hero-stat-value{display:block;font-size:2.25rem;font-weight:700;color:var(--gold)}
.hero-stat-label{color:rgba(212,175,55,.55);font-size:.8rem;margin-top:.2rem}

/* ── BUTTONS ── */
.btn-gold{background:var(--gold);color:var(--ink);font-weight:700;padding:.9rem 2.75rem;border-radius:.875rem;text-decoration:none;font-size:1.05rem;display:inline-block;transition:all .25s;border:none;cursor:pointer;font-family:'Noto Sans SC',sans-serif}
.btn-gold:hover{background:var(--gold-light);transform:translateY(-3px);box-shadow:0 6px 24px rgba(212,175,55,.35)}
.btn-primary{background:var(--primary);color:#fff;font-weight:700;padding:.75rem 1.75rem;border-radius:.75rem;text-decoration:none;font-size:.95rem;display:inline-block;transition:all .2s;border:none;cursor:pointer;font-family:'Noto Sans SC',sans-serif}
.btn-primary:hover{background:#9b2d22;transform:translateY(-1px)}
.btn-outline{background:none;border:1.5px solid rgba(212,175,55,.4);color:var(--gold);font-weight:600;padding:.65rem 1.5rem;border-radius:.75rem;text-decoration:none;font-size:.9rem;display:inline-block;transition:all .2s;cursor:pointer;font-family:'Noto Sans SC',sans-serif}
.btn-outline:hover{border-color:var(--gold);background:rgba(212,175,55,.08)}

/* ── LAYOUT ── */
.container{max-width:1100px;margin:0 auto;padding:0 1.75rem}
section.section{padding:5rem 0}
.section-title{font-family:'Noto Serif SC',serif;font-size:2.1rem;color:var(--ink);margin-bottom:2.75rem;text-align:center}
.section-title .accent{color:var(--jade)}
.section-subtitle{text-align:center;color:var(--muted);margin-top:-.5rem;margin-bottom:2.75rem}

/* ── CARDS ── */
.card{background:var(--ivory);border:1.5px solid var(--gold-border);border-radius:1.1rem;padding:1.75rem;box-shadow:0 2px 12px rgba(26,10,0,.05);transition:all .3s}
.card-link{text-decoration:none;color:inherit;display:block}
.card-link:hover .card,.card.hoverable:hover{border-color:rgba(46,122,110,.35);box-shadow:0 10px 32px rgba(26,10,0,.1);transform:translateY(-3px)}

/* ── LEVELS GRID ── */
.levels-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:1.75rem}
.level-card-zh{font-family:'Noto Serif SC',serif;font-size:4rem;font-weight:700;color:var(--jade);margin-bottom:.5rem;display:block;transition:transform .3s}
.card-link:hover .level-card-zh{transform:scale(1.12)}
.level-card-title{font-size:1.35rem;font-weight:700;color:var(--ink);margin-bottom:.25rem}
.level-card-hsk{color:var(--stone);font-size:.875rem;font-weight:600;margin-bottom:.75rem}
.level-card-units{color:var(--muted);font-size:.875rem;margin-bottom:1.25rem}
.level-card-cta{color:var(--gold);font-weight:600;font-size:.9rem}

/* ── FEATURES ── */
.features-bg{background:var(--ivory)}
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:1.5rem;text-align:center}
.feature-item{padding:2rem 1.25rem;border-radius:1rem;transition:background .2s}
.feature-item:hover{background:var(--rice)}
.feature-icon{font-size:2.75rem;margin-bottom:.875rem;display:block}
.feature-title{font-weight:700;color:var(--ink);margin-bottom:.5rem;font-size:1rem}
.feature-desc{color:var(--muted);font-size:.875rem;line-height:1.5}

/* ── FOOTER ── */
footer{background:var(--primary-dark);border-top:1px solid var(--gold-border);padding:2.75rem 2rem;margin-top:5rem}
.footer-inner{max-width:1100px;margin:0 auto;display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1.25rem}
.footer-logo{font-family:'Noto Serif SC',serif;font-size:1.35rem;color:var(--gold)}
.footer-nav{display:flex;gap:2rem}
.footer-nav a{color:rgba(212,175,55,.55);text-decoration:none;font-size:.875rem;transition:color .2s}
.footer-nav a:hover{color:var(--gold)}
.footer-copy{color:rgba(212,175,55,.3);font-size:.75rem}

/* ── BREADCRUMBS ── */
.breadcrumbs{display:flex;align-items:center;gap:.5rem;font-size:.85rem;color:var(--muted);margin-bottom:1.75rem;flex-wrap:wrap}
.breadcrumbs a{color:var(--muted);text-decoration:none;transition:color .2s}
.breadcrumbs a:hover{color:var(--jade)}
.breadcrumbs .sep{color:rgba(212,175,55,.35)}
.breadcrumbs .current{color:var(--ink);font-weight:500}

/* ── PROGRESS BAR ── */
.progress-bar{width:100%;height:5px;background:rgba(46,122,110,.12);border-radius:3px;overflow:hidden;margin-top:.875rem}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--gold),var(--gold-light));border-radius:3px;transition:width .6s ease}

/* ── PAGE HEADER ── */
.page-header{padding:3rem 1.75rem 0;max-width:1100px;margin:0 auto}
.page-title{font-family:'Noto Serif SC',serif;font-size:2.5rem;color:var(--ink);margin-bottom:.5rem}
.page-subtitle{color:var(--muted);margin-bottom:.25rem}
.page-zh{font-family:'Noto Serif SC',serif;color:var(--jade);font-size:1.1rem}

/* ── UNIT LIST ── */
.unit-list,.lesson-list{display:flex;flex-direction:column;gap:.875rem}
.unit-item,.lesson-item{display:flex;align-items:center;gap:1.25rem;padding:1.375rem 1.75rem;background:var(--ivory);border:1.5px solid var(--gold-border);border-radius:.875rem;text-decoration:none;color:inherit;transition:all .25s}
.unit-item:hover,.lesson-item:hover{border-color:rgba(46,122,110,.3);box-shadow:0 6px 20px rgba(26,10,0,.09);transform:translateX(4px)}
.unit-num{font-family:'Noto Serif SC',serif;font-size:2.25rem;font-weight:700;color:rgba(46,122,110,.2);width:3rem;flex-shrink:0;line-height:1}
.unit-info{flex:1}
.unit-title{font-weight:700;color:var(--ink);font-size:1.05rem;margin-bottom:.2rem}
.unit-subtitle{color:var(--muted);font-size:.875rem}
.unit-arrow{color:var(--jade);font-size:1.1rem;flex-shrink:0}
.lesson-num{width:34px;height:34px;border-radius:50%;border:1.5px solid rgba(212,175,55,.3);display:flex;align-items:center;justify-content:center;font-size:.875rem;color:var(--muted);flex-shrink:0}
.lesson-num.done{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.lesson-info{flex:1}

/* ── LESSON PAGE ── */
.lesson-page{max-width:800px;margin:0 auto;padding:2.75rem 1.75rem}
.lesson-title{font-family:'Noto Serif SC',serif;font-size:2.1rem;color:var(--ink);margin-bottom:2.5rem}
.lesson-section{margin-bottom:3rem}
.lesson-section-header{display:flex;align-items:baseline;gap:.875rem;margin-bottom:1.25rem;padding-bottom:.75rem;border-bottom:1px solid var(--gold-border)}
.lesson-section-zh{font-family:'Noto Serif SC',serif;font-size:1.35rem;color:var(--jade)}
.lesson-section-title{font-size:1.1rem;font-weight:700;color:var(--ink)}
.video-container{aspect-ratio:16/9;border-radius:.875rem;overflow:hidden;background:#000;box-shadow:0 8px 32px rgba(0,0,0,.25);margin-bottom:1rem}
.video-container iframe{width:100%;height:100%;border:none}
.vocab-list{display:flex;flex-direction:column;gap:.75rem}
.vocab-card{display:flex;align-items:center;gap:1.375rem;padding:1.1rem 1.375rem;background:var(--ivory);border:1.5px solid var(--gold-border);border-radius:.875rem;transition:border-color .2s}
.vocab-card:hover{border-color:rgba(46,122,110,.25)}
.vocab-hanzi{font-family:'Noto Serif SC',serif;font-size:2.5rem;font-weight:700;color:var(--ink);width:4.5rem;text-align:center;flex-shrink:0}
.vocab-info{flex:1}
.vocab-pinyin{color:var(--primary);font-style:italic;font-size:.9rem;margin-bottom:.2rem}
.vocab-translation{color:var(--ink);font-weight:500}
.audio-btn{padding:.3rem .875rem;border-radius:2rem;border:1px solid var(--gold-border);background:none;color:var(--muted);font-size:.8rem;cursor:pointer;transition:all .2s;font-family:'Noto Sans SC',sans-serif}
.audio-btn:hover{border-color:var(--jade);color:var(--jade);background:var(--jade-muted)}
.grammar-note{background:var(--jade-muted);border-left:4px solid var(--jade);border-radius:0 1rem 1rem 0;padding:1.375rem 1.75rem}
.grammar-pattern{font-family:'Noto Sans SC',monospace;font-size:1.15rem;color:var(--jade);font-weight:700;margin-bottom:.5rem}
.grammar-explanation{color:var(--ink);margin-bottom:1.1rem;line-height:1.6}
.grammar-examples{display:flex;flex-direction:column;gap:.6rem}
.grammar-example .zh{font-weight:700;color:var(--ink);font-size:.95rem}
.grammar-example .pinyin{font-style:italic;color:var(--muted);margin-left:.5rem;font-size:.875rem}
.grammar-example .trans{color:var(--muted);margin-left:.5rem;font-size:.875rem}
.dialogue{display:flex;flex-direction:column;gap:1.25rem}
.dialogue-line{display:flex;gap:.875rem;align-items:flex-start}
.dialogue-line.b{flex-direction:row-reverse}
.dialogue-speaker{width:34px;height:34px;border-radius:50%;background:var(--jade);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.875rem;flex-shrink:0;margin-top:.2rem}
.dialogue-bubble{background:var(--ivory);border:1.5px solid var(--gold-border);border-radius:.875rem;padding:1rem 1.25rem;max-width:440px}
.dialogue-line.b .dialogue-bubble{background:var(--jade-muted)}
.dialogue-zh{font-family:'Noto Serif SC',serif;font-size:1.15rem;color:var(--ink);margin-bottom:.25rem;line-height:1.5}
.dialogue-pinyin{color:var(--primary);font-style:italic;font-size:.85rem;margin-bottom:.2rem}
.dialogue-trans{color:var(--muted);font-size:.85rem}
.lesson-nav{display:flex;justify-content:space-between;align-items:center;padding-top:2.5rem;border-top:1px solid var(--gold-border);margin-top:2.5rem;gap:1rem}
.lesson-nav-link{color:var(--muted);text-decoration:none;font-size:.9rem;transition:color .2s;max-width:200px}
.lesson-nav-link:hover{color:var(--jade)}
.lesson-complete-btn{background:var(--primary);color:#fff;font-weight:700;padding:.75rem 1.75rem;border-radius:.75rem;border:none;cursor:pointer;font-size:.95rem;transition:all .2s;font-family:'Noto Sans SC',sans-serif}
.lesson-complete-btn.done{background:var(--gold);color:var(--ink)}
.lesson-complete-btn:hover{transform:translateY(-1px)}

/* ── FLASHCARDS ── */
.flashcard-page{max-width:580px;margin:0 auto;padding:2.75rem 1.75rem;text-align:center}
.fc-progress{color:var(--muted);font-size:.9rem;margin-bottom:1.75rem}
.flashcard-wrapper{perspective:1200px;margin-bottom:1.75rem;cursor:pointer;user-select:none}
.flashcard-inner{width:100%;min-height:260px;position:relative;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.4,0,.2,1)}
.flashcard-inner.flipped{transform:rotateY(180deg)}
.flashcard-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--ivory);border:2px solid var(--gold-border);border-radius:1.375rem;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem;box-shadow:0 4px 24px rgba(26,10,0,.09)}
.flashcard-back{transform:rotateY(180deg)}
.fc-hanzi{font-family:'Noto Serif SC',serif;font-size:5.5rem;color:var(--ink);line-height:1;margin-bottom:.875rem}
.fc-pinyin{color:var(--primary);font-style:italic;font-size:1.3rem}
.fc-translation{font-size:1.6rem;font-weight:600;color:var(--ink);margin-bottom:.5rem}
.fc-hint{color:rgba(212,175,55,.5);font-size:.85rem;margin-top:1.25rem}
.fc-back-pinyin{color:var(--primary);font-style:italic;font-size:1rem;margin-bottom:.75rem}
.reveal-btn{width:100%;padding:.9rem;border-radius:.875rem;background:var(--jade);color:#fff;font-weight:700;font-size:1rem;border:none;cursor:pointer;transition:all .2s;margin-bottom:.875rem;font-family:'Noto Sans SC',sans-serif}
.reveal-btn:hover{background:#256858}
.rating-btns{display:none;grid-template-columns:1fr 1fr 1fr;gap:.875rem}
.rating-btns.visible{display:grid}
.rating-btn{padding:.9rem;border-radius:.875rem;font-weight:600;font-size:.9rem;border:none;cursor:pointer;transition:all .2s;font-family:'Noto Sans SC',sans-serif}
.rating-btn:hover{transform:translateY(-2px)}
.rating-btn.missed{background:#fee2e2;color:#b91c1c}
.rating-btn.hard{background:#fef3c7;color:#b45309}
.rating-btn.knew{background:#d1fae5;color:#065f46}
.level-selector{display:flex;gap:.5rem;flex-wrap:wrap;justify-content:center;margin-bottom:2.25rem}
.level-sel-btn{padding:.5rem 1.375rem;border-radius:2rem;font-size:.875rem;font-weight:600;border:1.5px solid var(--gold-border);background:var(--ivory);color:var(--muted);cursor:pointer;transition:all .2s;font-family:'Noto Sans SC',sans-serif}
.level-sel-btn.active{background:var(--jade);color:#fff;border-color:var(--jade)}
.session-complete{background:var(--ivory);border:1.5px solid var(--gold-border);border-radius:1.375rem;padding:3.5rem 2.5rem;text-align:center;display:none}
.session-complete.visible{display:block}
.session-emoji{font-size:3.5rem;margin-bottom:1.25rem;display:block}
.session-title{font-family:'Noto Serif SC',serif;font-size:1.875rem;color:var(--ink);margin-bottom:1.75rem}
.session-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:2.25rem}
.stat-box{padding:1.25rem;background:var(--rice);border-radius:.875rem}
.stat-num{font-size:2.5rem;font-weight:700;display:block;margin-bottom:.25rem}
.stat-label{color:var(--muted);font-size:.8rem}
.stat-box.knew .stat-num{color:#16a34a}
.stat-box.hard .stat-num{color:#d97706}
.stat-box.missed .stat-num{color:#dc2626}

/* ── QUIZ ── */
.quiz-page{max-width:560px;margin:0 auto;padding:2.75rem 1.75rem}
.quiz-topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;color:var(--muted);font-size:.9rem}
.quiz-score{color:var(--gold);font-weight:700}
.quiz-question-card{background:var(--ivory);border:1.5px solid var(--gold-border);border-radius:1.375rem;padding:3rem;text-align:center;margin-bottom:1.375rem;box-shadow:0 2px 16px rgba(26,10,0,.07)}
.quiz-hanzi{font-family:'Noto Serif SC',serif;font-size:5.5rem;color:var(--ink);line-height:1;margin-bottom:.875rem}
.quiz-pinyin{color:var(--primary);font-style:italic;font-size:1.1rem}
.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:.875rem}
.quiz-option{padding:1.1rem 1rem;border-radius:.875rem;background:var(--ivory);border:1.5px solid var(--gold-border);font-weight:500;font-size:1rem;color:var(--ink);cursor:pointer;transition:all .2s;text-align:left;font-family:'Noto Sans SC',sans-serif}
.quiz-option:hover:not(:disabled){border-color:var(--jade);color:var(--jade);background:var(--jade-muted)}
.quiz-option.correct{background:#d1fae5!important;border-color:#16a34a!important;color:#065f46!important}
.quiz-option.wrong{background:#fee2e2!important;border-color:#dc2626!important;color:#b91c1c!important;opacity:.75}
.quiz-option.dimmed{opacity:.4}
.quiz-option:disabled{cursor:default}
.quiz-result{background:var(--ivory);border:1.5px solid var(--gold-border);border-radius:1.375rem;padding:3.5rem 2.5rem;text-align:center;display:none}
.quiz-result.visible{display:block}

/* ── ABOUT ── */
.about-page{max-width:780px;margin:0 auto;padding:3rem 1.75rem}
.about-section{background:var(--ivory);border:1.5px solid var(--gold-border);border-radius:1.1rem;padding:2rem;margin-bottom:1.5rem}
.about-zh{font-family:'Noto Serif SC',serif;font-size:1.5rem;color:var(--jade);margin-bottom:.35rem}
.about-title{font-size:1.2rem;font-weight:700;color:var(--ink);margin-bottom:.875rem}
.about-text{color:var(--muted);line-height:1.75}

/* ── RESPONSIVE ── */
@media(max-width:700px){
  .topbar-nav{display:none}
  .hero-stats{gap:1.75rem}
  .hero-title{font-size:4.5rem}
  .session-stats{grid-template-columns:1fr 1fr 1fr}
  .quiz-options{grid-template-columns:1fr}
  .lesson-nav{flex-direction:column;text-align:center}
  .hero::after{display:none}
}

/* ── PINYIN PAGE ── */
.pinyin-page{max-width:860px;margin:0 auto;padding:2.75rem 1.75rem}
.pinyin-section{margin-bottom:3.5rem}
.pinyin-section-header{display:flex;align-items:baseline;gap:.875rem;margin-bottom:1.5rem;padding-bottom:.75rem;border-bottom:1px solid var(--gold-border)}
.pinyin-section-zh{font-family:'Noto Serif SC',serif;font-size:1.5rem;color:var(--jade)}
.pinyin-section-title{font-size:1.1rem;font-weight:700;color:var(--ink)}

/* Tone cards */
.tone-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.tone-card{background:var(--ivory);border:2px solid var(--gold-border);border-radius:1rem;padding:1.5rem 1rem;text-align:center;transition:all .25s}
.tone-card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(26,10,0,.1)}
.tone-card.t1{border-top:4px solid #2D5A8E}
.tone-card.t2{border-top:4px solid #2E7A6E}
.tone-card.t3{border-top:4px solid #D4AF37}
.tone-card.t4{border-top:4px solid #C0392B}
.tone-num{font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;margin-bottom:.5rem;opacity:.6}
.tone-card.t1 .tone-num{color:#2D5A8E}
.tone-card.t2 .tone-num{color:#2E7A6E}
.tone-card.t3 .tone-num{color:#D4AF37}
.tone-card.t4 .tone-num{color:#C0392B}
.tone-mark{font-size:3rem;font-family:'Noto Serif SC',serif;line-height:1.2;margin-bottom:.5rem}
.tone-card.t1 .tone-mark{color:#2D5A8E}
.tone-card.t2 .tone-mark{color:#2E7A6E}
.tone-card.t3 .tone-mark{color:#D4AF37}
.tone-card.t4 .tone-mark{color:#C0392B}
.tone-desc{font-size:.8rem;color:var(--muted);margin-bottom:1rem;line-height:1.4}
.tone-example{font-family:'Noto Serif SC',serif;font-size:1.5rem;color:var(--ink);margin-bottom:.15rem}
.tone-pinyin{font-size:.85rem;color:var(--primary);font-style:italic;margin-bottom:.15rem}
.tone-trans{font-size:.8rem;color:var(--muted)}

/* Initial/Final cards grid */
.py-group{background:var(--ivory);border:1.5px solid var(--gold-border);border-radius:1.1rem;padding:1.5rem 1.5rem 1.25rem;margin-bottom:1.25rem;box-shadow:0 2px 8px rgba(26,10,0,.04)}
.py-group-label{display:flex;align-items:center;gap:.75rem;font-size:.95rem;font-weight:700;color:var(--ink);margin-bottom:1.25rem;padding-bottom:1rem;border-bottom:1px solid var(--gold-border)}
.py-group-label::before{content:'';display:inline-block;width:4px;height:1.1em;background:var(--jade);border-radius:2px;flex-shrink:0}
.py-group-chars{margin-left:auto;font-family:'Noto Serif SC',serif;font-size:1rem;color:var(--jade);opacity:.7;letter-spacing:.05em}
.py-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:1rem}
.py-card{background:#fff;border:1.5px solid var(--gold-border);border-radius:.875rem;padding:1.25rem 1rem;text-align:center;transition:all .2s}
.py-card:hover{border-color:var(--jade);box-shadow:0 6px 20px rgba(26,10,0,.1);transform:translateY(-3px)}
.py-syllable{font-family:'Noto Serif SC',serif;font-size:2rem;font-weight:700;color:var(--ink);margin-bottom:.3rem}
.py-transcription{font-size:.78rem;color:var(--muted);margin-bottom:.6rem;line-height:1.4}
.py-example{font-size:.78rem;color:var(--stone);margin-bottom:.75rem;line-height:1.4}
.py-btn{display:inline-block;padding:.3rem .875rem;border-radius:2rem;border:1px solid var(--gold-border);background:none;color:var(--muted);font-size:.78rem;text-decoration:none;transition:all .2s;font-family:'Noto Sans SC',sans-serif}
.py-btn:hover{border-color:var(--jade);color:var(--jade);background:var(--jade-muted)}

/* Neutral tone block */
.neutral-tone-block{background:var(--jade-muted);border-left:4px solid var(--jade);border-radius:0 1rem 1rem 0;padding:1.375rem 1.75rem}
.neutral-tone-examples{display:flex;flex-direction:column;gap:.5rem;margin-top:.875rem}
.neutral-tone-example{display:flex;align-items:baseline;gap:.5rem}
.nte-zh{font-family:'Noto Serif SC',serif;font-size:1.1rem;color:var(--ink);font-weight:700}
.nte-pinyin{font-style:italic;color:var(--primary);font-size:.875rem}
.nte-trans{color:var(--muted);font-size:.875rem}

@media(max-width:640px){
  .tone-grid{grid-template-columns:repeat(2,1fr)}
  .py-grid{grid-template-columns:repeat(auto-fill,minmax(100px,1fr))}
}