:root{
  --navy:#0f172a;
  --blue:#1d4ed8;
  --blue-2:#2563eb;
  --sky:#38bdf8;
  --sky-100:#e0f2fe;
  --orange:#f59e0b;
  --green:#10b981;
  --purple:#8b5cf6;
  --ink:#1e293b;
  --muted:#64748b;
  --surface:#ffffff;
  --bg:#f8fafc;
  --line:#e2e8f0;
  --shadow:0 18px 50px rgba(15,23,42,.10);
  --shadow-lg:0 28px 70px rgba(15,23,42,.18);
  --radius:24px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65}
a{text-decoration:none;color:inherit}
button,a.button{font:inherit}
.container{width:min(1180px,calc(100% - 32px));margin:0 auto}
.topbar{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(14px);border-bottom:1px solid rgba(226,232,240,.9)}
.nav{min-height:82px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand img{display:block;width:248px;max-width:46vw}
.nav-links{display:flex;align-items:center;gap:8px}
.nav-item{position:relative}
.nav-link{border:0;background:transparent;padding:12px 14px;border-radius:12px;font-size:15px;font-weight:800;color:#475569;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.nav-link:hover,.nav-item.open>.nav-link,.nav-link.active{background:#eff6ff;color:var(--blue)}
.caret{font-size:11px;transition:transform .2s}
.nav-item.open .caret{transform:rotate(180deg)}
.dropdown{position:absolute;top:calc(100% + 12px);left:0;min-width:280px;padding:12px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);display:none}
.nav-item.open .dropdown{display:block}
.dropdown a{display:block;padding:11px 12px;border-radius:11px;font-weight:700;color:#475569}
.dropdown a:hover{background:#eff6ff;color:var(--blue)}
.dropdown-title{padding:7px 12px 5px;color:#94a3b8;font-size:12px;font-weight:900;text-transform:uppercase;letter-spacing:.7px}
.dropdown-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.dropdown-grid a{text-align:center;background:#f8fafc}
.mobile-menu{display:none;border:0;width:44px;height:44px;border-radius:12px;background:#eff6ff;color:var(--blue);font-size:22px;cursor:pointer}
.hero{position:relative;overflow:hidden;padding:104px 0 92px;color:#fff;background:
  radial-gradient(circle at 82% 14%,rgba(255,255,255,.18),transparent 24%),
  radial-gradient(circle at 8% 96%,rgba(56,189,248,.16),transparent 30%),
  linear-gradient(135deg,#0f3d75 0%,#1d4ed8 58%,#38bdf8 100%)}
.hero:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);background-size:36px 36px}
.hero-grid{position:relative;display:grid;grid-template-columns:1.08fr .92fr;gap:64px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 15px;border-radius:999px;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.22);font-size:14px;font-weight:800;margin-bottom:18px}
.hero h1{margin:0 0 18px;font-size:clamp(48px,6.3vw,76px);line-height:1.03;letter-spacing:-1.8px}
.hero .tagline{font-size:28px;font-weight:800;margin-bottom:12px}
.hero .lead{max-width:700px;margin:0;font-size:19px;color:rgba(255,255,255,.90)}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 24px;border-radius:999px;font-weight:900;transition:.2s}
.button:hover{transform:translateY(-2px)}
.button-primary{background:var(--orange);color:#fff;box-shadow:0 12px 28px rgba(245,158,11,.35)}
.button-light{background:#fff;color:var(--navy)}
.hero-card{background:#fff;color:var(--ink);border-radius:28px;padding:34px;box-shadow:var(--shadow-lg)}
.hero-card h3{margin:0 0 22px;font-size:26px;color:var(--navy)}
.learning-list{display:grid;gap:14px}
.learning-item{display:flex;gap:14px;align-items:flex-start;padding:16px;border-radius:16px;background:#f8fbff;border:1px solid #e7eef7}
.learning-icon{width:44px;height:44px;flex:0 0 44px;border-radius:13px;display:grid;place-items:center;color:#fff;font-size:21px;font-weight:900}
.section{padding:82px 0}
.section.alt{background:#eef5fb}
.section-heading{text-align:center;max-width:820px;margin:0 auto 40px}
.section-heading .kicker{font-size:13px;font-weight:900;text-transform:uppercase;letter-spacing:1px;color:var(--blue);margin-bottom:8px}
.section-heading h2{margin:0 0 12px;font-size:clamp(32px,4vw,46px);line-height:1.15;color:var(--navy)}
.section-heading p{margin:0;color:var(--muted);font-size:17px}
.hsk-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:26px;box-shadow:0 10px 28px rgba(15,23,42,.06);transition:.2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.level-badge{width:66px;height:66px;border-radius:18px;display:grid;place-items:center;color:#fff;font-weight:900;margin-bottom:16px;background:linear-gradient(135deg,var(--blue),var(--sky))}
.card:nth-child(3n+2) .level-badge{background:linear-gradient(135deg,var(--green),#34d399)}
.card:nth-child(3n) .level-badge{background:linear-gradient(135deg,var(--purple),#a78bfa)}
.card h3{margin:8px 0;color:var(--navy)}
.card p{color:var(--muted)}
.text-link{font-weight:900;color:var(--blue)}
.subject-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.subject-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:26px;box-shadow:0 10px 28px rgba(15,23,42,.06);transition:.2s}
.subject-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.subject-icon{width:54px;height:54px;border-radius:16px;display:grid;place-items:center;background:#eff6ff;font-size:28px;margin-bottom:16px}
.resource-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.resource-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;text-align:center}
.resource-icon{font-size:30px;margin-bottom:8px}
.blog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.blog-card{overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:22px}
.blog-cover{height:150px;background:linear-gradient(135deg,#dbeafe,#e0f2fe);display:grid;place-items:center;color:var(--blue);font-size:38px}
.blog-content{padding:22px}
.about-split{display:grid;grid-template-columns:.85fr 1.15fr;gap:30px;align-items:stretch}
.about-visual{min-height:340px;border-radius:24px;background:
  radial-gradient(circle at 30% 30%,rgba(59,130,246,.28),transparent 24%),
  linear-gradient(135deg,#dbeafe,#ede9fe);display:grid;place-items:center;color:var(--blue);font-weight:900;text-align:center;padding:24px}
.about-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:32px}
.cta{padding:72px 0}
.cta-box{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:42px;border-radius:28px;color:#fff;background:linear-gradient(135deg,#0f3d75,#1d4ed8);box-shadow:var(--shadow)}
.page-hero{padding:66px 0;color:#fff;background:linear-gradient(135deg,#0f3d75,#1d4ed8)}
.page-hero h1{margin:0 0 8px;font-size:clamp(40px,5vw,58px)}
.page-hero p{margin:0;color:rgba(255,255,255,.9)}
.lesson-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.badge{display:inline-block;padding:5px 10px;border-radius:999px;background:#eff6ff;color:var(--blue);font-size:13px;font-weight:900}
footer{padding:32px 0;background:#0f2746;color:rgba(255,255,255,.85)}
.footer-grid{display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:28px}
.footer-grid h4{margin:0 0 10px;color:#fff}
.footer-grid a{display:block;color:rgba(255,255,255,.74);margin:6px 0}
.copyright{text-align:center;margin-top:26px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12)}
@media(min-width:901px){.nav-item:hover .dropdown{display:block}}
@media(max-width:1000px){
  .subject-grid{grid-template-columns:repeat(2,1fr)}
  .resource-grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:900px){
  .mobile-menu{display:block}
  .brand img{width:220px;max-width:67vw}
  .nav-links{position:absolute;top:82px;left:16px;right:16px;display:none;flex-direction:column;align-items:stretch;gap:4px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:12px;box-shadow:var(--shadow)}
  .nav-links.open{display:flex}
  .nav-item{width:100%}
  .nav-link{width:100%;justify-content:space-between}
  .dropdown{position:static;min-width:0;margin-top:6px;box-shadow:none;background:#f8fafc}
  .hero-grid,.about-split{grid-template-columns:1fr}
  .hsk-grid,.blog-grid,.lesson-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:680px){
  .hero{padding:76px 0}
  .hsk-grid,.subject-grid,.resource-grid,.blog-grid,.lesson-grid,.footer-grid{grid-template-columns:1fr}
  .dropdown-grid{grid-template-columns:repeat(2,1fr)}
  .cta-box{display:grid}
}

/* Danh mục Học liệu tự động theo bài HSK */
.auto-library{max-width:1180px;margin:52px auto 0;font-family:"Times New Roman",Times,serif}
.auto-level{margin-top:42px}
.auto-level>h2{margin:0 0 22px;color:var(--navy);font-size:38px;font-weight:900}
.auto-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.auto-item{display:flex;flex-direction:column;gap:8px;min-height:128px;padding:24px;border:2px solid var(--line);border-radius:20px;background:#fff;box-shadow:0 10px 24px rgba(15,23,42,.07);transition:.2s}
.auto-item:hover{transform:translateY(-5px);border-color:var(--blue);box-shadow:0 16px 32px rgba(15,23,42,.12)}
.auto-item b{color:var(--navy);font-size:26px;font-weight:900}
.auto-item span{color:var(--blue);font-size:18px;font-weight:800;line-height:1.5}
@media(max-width:900px){.auto-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:580px){.auto-grid{grid-template-columns:1fr}.auto-level>h2{font-size:32px}.auto-item b{font-size:24px}.auto-item span{font-size:18px}}
/* ===== Bổ sung liên hệ tuyển sinh ===== */
.contact-strip{background:#0f3d75;color:#fff;font-size:14px}.contact-strip-inner{min-height:42px;display:flex;align-items:center;justify-content:space-between;gap:16px}.contact-main{display:flex;align-items:center;gap:7px;font-weight:700}.contact-main a{font-weight:900}.contact-actions{display:flex;gap:10px}.contact-link{padding:6px 11px;border-radius:999px;background:rgba(255,255,255,.12);font-weight:800}.contact-link.zalo{background:#0ea5e9}.header-cta{background:var(--orange);color:#fff;padding:11px 17px;border-radius:999px;font-weight:900;box-shadow:0 10px 22px rgba(245,158,11,.25)}.consult-section{padding:72px 0}.consult-box{display:flex;align-items:center;justify-content:space-between;gap:30px;padding:38px 42px;border-radius:28px;color:#fff;background:linear-gradient(135deg,#0f3d75,#1d4ed8);box-shadow:var(--shadow)}.consult-kicker{font-size:12px;letter-spacing:1px;font-weight:900;color:#bfdbfe}.consult-box h2{margin:8px 0;font-size:34px}.consult-box p{margin:0;color:rgba(255,255,255,.86)}.consult-contact{display:flex;gap:12px;flex-wrap:wrap}.consult-phone,.consult-zalo{display:inline-flex;align-items:center;justify-content:center;padding:14px 20px;border-radius:999px;font-weight:900}.consult-phone{background:#fff;color:var(--navy)}.consult-zalo{background:#0ea5e9;color:#fff}.floating-contact{position:fixed;right:18px;bottom:20px;z-index:120;display:grid;gap:10px}.floating-btn{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:900;box-shadow:0 12px 28px rgba(15,23,42,.22)}.floating-btn.phone{background:#10b981;font-size:23px}.floating-btn.zalo{background:#0ea5e9;font-size:13px}@media(max-width:900px){.contact-strip-inner{padding:8px 0}.contact-actions{display:none}.header-cta{text-align:center}}@media(max-width:680px){.consult-box{display:grid;padding:30px 24px}.consult-contact{display:grid}.contact-main{font-size:13px}}


/* ===== Version 3.1: Trang Giới thiệu Cô Mai ===== */
.about-hero-v31{
  padding:72px 0;
  color:#fff;
  background:
    radial-gradient(circle at 86% 12%,rgba(255,255,255,.16),transparent 24%),
    linear-gradient(135deg,#0f3d75,#1d4ed8 62%,#38bdf8);
}
.about-hero-card-v31{
  display:grid;
  grid-template-columns:1.25fr .75fr;
  align-items:center;
  gap:36px;
}
.about-kicker-v31{
  color:#60a5fa;
  font-size:13px;
  font-weight:900;
  letter-spacing:1px;
  text-transform:uppercase;
}
.about-hero-v31 .about-kicker-v31{color:#bfdbfe}
.about-hero-v31 h1{
  margin:8px 0 12px;
  font-size:clamp(42px,6vw,68px);
  line-height:1.05;
}
.about-role-v31{
  margin:0;
  font-size:21px;
  font-weight:800;
}
.about-school-v31{
  margin:5px 0 0;
  color:rgba(255,255,255,.86);
}
.about-slogan-v31{
  display:inline-block;
  margin-top:20px;
  padding:9px 14px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.24);
  background:rgba(255,255,255,.09);
  font-weight:900;
}
.about-contact-v31{
  padding:28px;
  border-radius:24px;
  color:var(--ink);
  background:#fff;
  box-shadow:var(--shadow-lg);
}
.about-phone-label-v31{
  color:var(--muted);
  font-size:13px;
  font-weight:900;
  text-transform:uppercase;
}
.about-phone-v31{
  display:block;
  margin:7px 0 18px;
  color:var(--blue);
  font-size:31px;
  line-height:1.1;
  font-weight:900;
}
.about-contact-actions-v31{
  display:flex;
  gap:10px;
}
.about-contact-actions-v31 a{
  flex:1;
  padding:12px 14px;
  border-radius:999px;
  text-align:center;
  color:#fff;
  background:var(--green);
  font-weight:900;
}
.about-contact-actions-v31 a.zalo{background:#0ea5e9}
.about-content-v31{
  display:grid;
  grid-template-columns:1.25fr .75fr;
  gap:30px;
  align-items:start;
}
.about-story-v31{
  padding:32px;
  border:1px solid var(--line);
  border-radius:24px;
  background:#fff;
}
.about-story-v31 h2{
  margin:8px 0 18px;
  color:var(--navy);
  font-size:34px;
}
.about-story-v31 p{color:#475569}
.about-summary-v31{
  display:grid;
  gap:14px;
}
.about-summary-item-v31{
  display:flex;
  gap:14px;
  align-items:flex-start;
  padding:18px;
  border:1px solid var(--line);
  border-radius:18px;
  background:#fff;
}
.about-summary-item-v31>span{
  width:42px;
  height:42px;
  flex:0 0 42px;
  display:grid;
  place-items:center;
  border-radius:13px;
  background:#eff6ff;
  font-size:22px;
}
.about-summary-item-v31 strong{
  display:block;
  color:var(--navy);
}
.about-summary-item-v31 small{
  display:block;
  color:var(--muted);
  margin-top:2px;
}
.teaching-grid-v31{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}
.teaching-grid-v31 article{
  padding:24px;
  border:1px solid var(--line);
  border-radius:20px;
  background:#fff;
  text-align:center;
}
.teaching-icon-v31{
  font-size:31px;
  margin-bottom:9px;
}
.teaching-grid-v31 h3{
  margin:0 0 6px;
  color:var(--navy);
}
.teaching-grid-v31 p{
  margin:0;
  color:var(--muted);
}
.training-grid-v31{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
}
.training-grid-v31 a{
  padding:25px;
  border:1px solid var(--line);
  border-radius:20px;
  background:#fff;
  box-shadow:0 8px 22px rgba(15,23,42,.05);
  transition:.2s;
}
.training-grid-v31 a:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow);
}
.training-grid-v31 span{font-size:31px}
.training-grid-v31 h3{
  margin:9px 0 5px;
  color:var(--navy);
}
.training-grid-v31 p{
  margin:0;
  color:var(--muted);
}
.why-grid-v31{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:14px;
  max-width:900px;
  margin:0 auto;
}
.why-grid-v31 div{
  padding:17px 19px;
  border:1px solid var(--line);
  border-radius:16px;
  background:#fff;
  color:#334155;
  font-weight:700;
}

@media(max-width:900px){
  .about-hero-card-v31,
  .about-content-v31{
    grid-template-columns:1fr;
  }
  .teaching-grid-v31,
  .training-grid-v31{
    grid-template-columns:repeat(2,1fr);
  }
}
@media(max-width:680px){
  .about-contact-actions-v31,
  .teaching-grid-v31,
  .training-grid-v31,
  .why-grid-v31{
    grid-template-columns:1fr;
    display:grid;
  }
  .about-phone-v31{font-size:26px}
}


/* ===== Version 3.2: HSK 1 - Bài 1 ===== */
.lesson-hero-v32{padding:72px 0;color:#fff;background:linear-gradient(135deg,#0f3d75,#1d4ed8 60%,#38bdf8)}
.lesson-hero-grid-v32{display:grid;grid-template-columns:1.3fr .7fr;gap:36px;align-items:center}
.lesson-badge-v32{display:inline-block;padding:7px 13px;border:1px solid rgba(255,255,255,.25);border-radius:999px;background:rgba(255,255,255,.1);font-weight:900}
.lesson-hero-v32 h1{font-size:clamp(44px,6vw,68px);margin:14px 0 4px;line-height:1.08}
.lesson-title-vi-v32{font-size:25px;font-weight:800;margin:0 0 10px}
.lesson-meta-v32{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.lesson-meta-v32 span{padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.12)}
.lesson-progress-card-v32{padding:26px;border-radius:22px;background:#fff;color:var(--ink);box-shadow:var(--shadow-lg)}
.progress-track-v32{height:12px;background:#e2e8f0;border-radius:999px;overflow:hidden;margin:13px 0 8px}
.progress-bar-v32{height:100%;width:0;background:linear-gradient(90deg,var(--orange),#fbbf24);transition:.3s}
.lesson-small-btn-v32{margin-top:14px;border:0;background:#eff6ff;color:var(--blue);padding:9px 13px;border-radius:999px;font-weight:800;cursor:pointer}
.lesson-sticky-nav-v32{position:sticky;top:82px;z-index:80;background:#fff;border-bottom:1px solid var(--line)}
.lesson-nav-scroll-v32{display:flex;overflow:auto;gap:7px;padding:10px 0}
.lesson-nav-scroll-v32 a{white-space:nowrap;padding:8px 12px;border-radius:999px;font-size:14px;font-weight:800;color:#475569}
.lesson-nav-scroll-v32 a:hover{background:#eff6ff;color:var(--blue)}
.lesson-section-v32{padding:72px 0}
.lesson-alt-v32{background:#eef5fb}
.lesson-heading-v32{display:flex;gap:14px;align-items:center;margin-bottom:28px}
.lesson-heading-v32>span{width:54px;height:54px;display:grid;place-items:center;border-radius:16px;background:var(--blue);color:#fff;font-size:25px;font-weight:900}
.lesson-heading-v32 small{color:var(--blue);font-weight:900;letter-spacing:.8px}
.lesson-heading-v32 h2{margin:3px 0 0;color:var(--navy);font-size:34px}
.objective-grid-v32{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.objective-card-v32{display:flex;gap:13px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:18px}
.objective-card-v32 span{width:34px;height:34px;flex:0 0 34px;display:grid;place-items:center;border-radius:10px;background:#dbeafe;color:var(--blue);font-weight:900}
.objective-card-v32 p{margin:0}
.lesson-search-v32{width:100%;padding:15px 17px;border:1px solid var(--line);border-radius:14px;font-size:16px;margin-bottom:20px}
.vocab-grid-v32{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.vocab-card-v32{padding:22px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:0 8px 24px rgba(15,23,42,.05)}
.vocab-head-v32{display:flex;justify-content:space-between;gap:12px;align-items:start}
.vocab-hanzi-v32{font-size:38px;font-weight:900;color:var(--navy)}
.vocab-type-v32{padding:5px 9px;border-radius:999px;background:#eff6ff;color:var(--blue);font-size:12px;font-weight:800}
.vocab-pinyin-v32{color:var(--blue);font-size:18px;font-weight:800}
.vocab-card-v32 h3{margin:6px 0 13px}
.vocab-example-v32{display:grid;gap:2px;padding:13px;border-radius:14px;background:#f8fafc}
.vocab-example-v32 em{color:var(--blue)}
.vocab-example-v32 span{color:var(--muted)}
.vocab-note-v32{font-size:14px;color:#475569}
.flashcard-stage-v32{display:flex;align-items:center;justify-content:center;gap:18px}
.flashcard-v32{width:min(500px,75vw);height:300px;perspective:1000px;cursor:pointer}
.flashcard-inner-v32{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}
.flashcard-v32.flipped .flashcard-inner-v32{transform:rotateY(180deg)}
.flashcard-front-v32,.flashcard-back-v32{position:absolute;inset:0;backface-visibility:hidden;border-radius:28px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:30px;box-shadow:var(--shadow)}
.flashcard-front-v32{background:linear-gradient(135deg,#1d4ed8,#38bdf8);color:#fff}
.flashcard-front-v32>div{font-size:76px;font-weight:900}
.flashcard-back-v32{background:#fff;border:1px solid var(--line);transform:rotateY(180deg);text-align:center}
.flashcard-back-v32>div{font-size:26px;color:var(--blue);font-weight:900}
.flashcard-back-v32 strong{font-size:25px;margin:10px 0}
.flash-nav-v32{width:48px;height:48px;border:0;border-radius:50%;background:#fff;box-shadow:var(--shadow);font-size:23px;cursor:pointer}
.card-counter-v32{text-align:center;margin-top:15px;font-weight:900;color:var(--muted)}
.pattern-grid-v32{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.pattern-card-v32{padding:25px;background:#fff;border:1px solid var(--line);border-radius:20px}
.pattern-formula-v32{display:inline-block;padding:9px 13px;border-radius:12px;background:#fff7ed;color:#c2410c;font-size:21px;font-weight:900}
.pattern-examples-v32{display:grid;gap:10px;margin-top:14px}
.pattern-examples-v32>div{display:grid;padding:12px;border-radius:13px;background:#f8fafc}
.pattern-examples-v32 em{color:var(--blue)}
.pattern-examples-v32 span{color:var(--muted)}
.pattern-warning-v32{margin-top:14px;padding:12px;border-radius:13px;background:#fff7ed;color:#9a3412}
.dialogue-grid-v32{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.dialogue-card-v32{padding:23px;background:#fff;border:1px solid var(--line);border-radius:20px}
.dialogue-context-v32{color:var(--muted)}
.dialogue-line-v32{display:grid;grid-template-columns:90px 1fr;gap:10px;padding:12px 0;border-top:1px solid var(--line)}
.dialogue-line-v32 div{display:grid}
.dialogue-line-v32 em{color:var(--blue)}
.dialogue-line-v32 span{color:var(--muted)}
.teacher-tip-v32{margin-top:24px;padding:25px;border-radius:20px;background:#fff7ed;border:1px solid #fed7aa}
.pronunciation-grid-v32{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.pron-card-v32{padding:22px;background:#fff;border:1px solid var(--line);border-radius:20px}
.sound-chips-v32{display:flex;gap:8px;flex-wrap:wrap}
.sound-chips-v32 span{min-width:38px;padding:7px 10px;text-align:center;border-radius:10px;background:#eff6ff;color:var(--blue);font-weight:900}
.tone-grid-v32{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:18px}
.tone-grid-v32 div{display:grid;text-align:center;padding:18px;border-radius:17px;background:#fff;border:1px solid var(--line)}
.tone-grid-v32 span{font-size:35px;color:var(--blue);font-weight:900}
.pron-practice-v32{margin-top:18px;padding:22px;border-radius:20px;background:#fff;border:1px solid var(--line)}
.pron-practice-v32 span{display:inline-block;margin:5px;padding:7px 10px;border-radius:9px;background:#f8fafc;font-weight:800}
.quiz-list-v32{display:grid;gap:15px}
.quiz-item-v32{padding:22px;background:#fff;border:1px solid var(--line);border-radius:18px}
.quiz-item-v32 h3{font-size:18px;margin:0 0 13px}
.quiz-item-v32 label{display:block;padding:9px 12px;border-radius:10px;margin:5px 0;background:#f8fafc;cursor:pointer}
.quiz-text-v32{width:100%;padding:12px;border:1px solid var(--line);border-radius:10px}
.answer-note-v32{margin-top:10px;padding:0;border-radius:10px}
.answer-note-v32.correct,.answer-note-v32.incorrect{padding:10px 12px}
.answer-note-v32.correct{background:#ecfdf5;color:#047857}
.answer-note-v32.incorrect{background:#fff7ed;color:#c2410c}
.quiz-actions-v32{display:flex;gap:12px;margin-top:22px}
.lesson-outline-btn-v32{border:1px solid var(--blue);background:#fff;color:var(--blue)}
.quiz-result-v32{display:grid;gap:4px;margin-top:18px;padding:20px;border-radius:17px;background:#eff6ff;color:var(--navy)}
.quiz-result-v32 strong{font-size:22px}
.lesson-summary-v32{display:flex;justify-content:space-between;align-items:center;gap:30px;padding:34px;border-radius:25px;background:linear-gradient(135deg,#0f3d75,#1d4ed8);color:#fff}
.summary-numbers-v32{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.summary-numbers-v32 span{display:grid;text-align:center;padding:12px;border-radius:14px;background:rgba(255,255,255,.1)}
.summary-numbers-v32 strong{font-size:25px}
.lesson-launch-card-v32{display:block}
.lesson-card-meta-v32{display:flex;gap:8px;margin:12px 0}
.lesson-card-meta-v32 span{padding:5px 9px;border-radius:999px;background:#eff6ff;color:var(--blue);font-size:13px;font-weight:800}
@media(max-width:900px){
  .lesson-hero-grid-v32,.objective-grid-v32,.vocab-grid-v32,.dialogue-grid-v32,.pronunciation-grid-v32{grid-template-columns:1fr 1fr}
  .pattern-grid-v32{grid-template-columns:1fr}
  .lesson-summary-v32{display:grid}
}
@media(max-width:680px){
  .lesson-hero-grid-v32,.objective-grid-v32,.vocab-grid-v32,.dialogue-grid-v32,.pronunciation-grid-v32,.tone-grid-v32{grid-template-columns:1fr}
  .lesson-sticky-nav-v32{top:82px}
  .lesson-heading-v32 h2{font-size:28px}
  .summary-numbers-v32{grid-template-columns:1fr 1fr}
  .flashcard-v32{width:72vw;height:270px}
  .flashcard-front-v32>div{font-size:58px}
}


/* ===== Version 3.3: Audio Manager ===== */
.lesson-audio-info-v33{padding:18px 0;background:#eff6ff;border-bottom:1px solid #dbeafe}
.audio-info-box-v33{display:flex;align-items:center;gap:15px;padding:15px 18px;border:1px solid #bfdbfe;border-radius:16px;background:#fff}
.audio-info-icon-v33{width:46px;height:46px;flex:0 0 46px;display:grid;place-items:center;border-radius:14px;background:#dbeafe;font-size:23px}
.audio-info-box-v33 strong{display:block;color:var(--navy);font-size:17px}
.audio-info-box-v33 p{margin:2px 0 0;color:var(--muted);font-size:14px}
.audio-btn-v33{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  min-height:34px;
  padding:6px 10px;
  border:1px solid #bfdbfe;
  border-radius:999px;
  background:#eff6ff;
  color:var(--blue);
  font-size:13px;
  font-weight:900;
  cursor:pointer;
  transition:.18s;
}
.audio-btn-v33:hover{transform:translateY(-1px);background:#dbeafe}
.audio-btn-v33.is-playing{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 0 0 4px rgba(37,99,235,.12)}
.audio-btn-v33.is-playing .audio-icon-v33{animation:audioPulseV33 .8s infinite alternate}
@keyframes audioPulseV33{from{transform:scale(.9)}to{transform:scale(1.18)}}
.vocab-pinyin-row-v33,.example-audio-row-v33,.pattern-formula-row-v33,.dialogue-title-row-v33{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}
.example-audio-row-v33{align-items:flex-start}
.dialogue-title-row-v33{align-items:flex-start;margin-bottom:10px}
.dialogue-title-row-v33 h3,.dialogue-title-row-v33 p{margin-top:0}
.audio-btn-card-v33{margin-top:14px}
.pron-audio-chip-v33{
  display:inline-flex !important;
  align-items:center;
  gap:6px;
  padding:6px 8px !important;
}
.pron-audio-chip-v33 .audio-label-v33{display:none}
.pron-audio-chip-v33 .audio-btn-v33{min-height:28px;padding:3px 7px}
@media(max-width:680px){
  .audio-label-v33{display:none}
  .audio-btn-v33{width:34px;height:34px;padding:0;flex:0 0 34px}
  .dialogue-title-row-v33 .audio-label-v33{display:inline}
  .dialogue-title-row-v33 .audio-btn-v33{width:auto;padding:6px 10px}
  .audio-info-box-v33{align-items:flex-start}
}


/* ===== Version 3.3 Font Update =====
   - Tiếng Việt và pinyin: Times New Roman
   - Chữ Hán: font chuyên dụng, ưu tiên font Song/Serif CJK
*/
html,
body,
button,
input,
select,
textarea,
.nav-link,
.header-cta,
.contact-strip,
.button,
.card,
.section-heading,
.lesson-section-v32,
.quiz-question-v32,
footer {
  font-family: "Times New Roman", Times, serif;
}

/* Pinyin và phần phiên âm */
.vocab-pinyin-v32,
.vocab-example-v32 em,
.dialogue-line-v32 em,
.pattern-examples-v32 em,
.flashcard-back-v32 #cardPinyin,
.lesson-meta-v32,
.lesson-objectives-v32,
.pronunciation-box-v32,
.pron-practice-v32,
.about-role-v31,
.about-school-v31 {
  font-family: "Times New Roman", Times, serif;
  font-style: normal;
}

/* Chữ Hán và câu tiếng Trung */
.hanzi,
.vocab-hanzi-v32,
.vocab-example-v32 strong,
.dialogue-line-v32 strong,
.pattern-formula-v32,
.pattern-examples-v32 strong,
.flashcard-front-v32,
#cardHanzi,
.lesson-title-zh-v32,
.pron-audio-chip-v33,
[data-audio-text] {
  font-family:
    "Noto Serif SC",
    "Source Han Serif SC",
    "Songti SC",
    "SimSun",
    "STSong",
    "Microsoft YaHei",
    serif;
}

/* Tăng độ rõ của chữ Hán */
.vocab-hanzi-v32,
.flashcard-front-v32,
#cardHanzi {
  font-weight: 700;
  letter-spacing: .02em;
}

/* Tiêu đề vẫn trang trọng và dễ đọc */
h1,h2,h3,h4,h5,h6 {
  font-family: "Times New Roman", Times, serif;
}

/* Riêng tiêu đề có chữ Hán dùng font Hán */
.lesson-title-zh-v32,
.vocab-hanzi-v32,
.pattern-formula-v32 {
  line-height: 1.35;
}


/* ===== Version 3.3.1 Audio Hotfix ===== */
.audio-btn-v33{
  display:inline-flex !important;
  visibility:visible !important;
  opacity:1 !important;
  position:relative !important;
  z-index:3 !important;
  min-width:86px !important;
  width:auto !important;
  height:36px !important;
  flex:0 0 auto !important;
  padding:7px 12px !important;
  border:1px solid #2563eb !important;
  border-radius:999px !important;
  background:#eff6ff !important;
  color:#1d4ed8 !important;
  font-family:"Times New Roman", Times, serif !important;
  font-size:15px !important;
  font-weight:700 !important;
  line-height:1 !important;
}
.audio-btn-v33:hover{
  background:#dbeafe !important;
}
.audio-btn-v33.is-playing{
  background:#2563eb !important;
  color:#fff !important;
}
.audio-icon-v33,
.audio-label-v33{
  display:inline !important;
  visibility:visible !important;
  opacity:1 !important;
}
.vocab-pinyin-row-v33,
.example-audio-row-v33,
.pattern-formula-row-v33,
.dialogue-title-row-v33{
  display:flex !important;
  align-items:center !important;
  justify-content:space-between !important;
  gap:10px !important;
}
.vocab-pinyin-row-v33 .audio-btn-v33{
  margin-left:auto !important;
}
@media(max-width:680px){
  .audio-btn-v33{
    min-width:76px !important;
    width:auto !important;
    height:34px !important;
    padding:6px 9px !important;
    font-size:14px !important;
  }
  .audio-label-v33{
    display:inline !important;
  }
}