:root{
  --bg:#fbf7f0; --ink:#1c1a17; --muted:#6b6258; --line:#e7ddcd;
  --red:#c1272d; --gold:#d9a521; --card:#fff; --shadow:0 6px 24px rgba(40,30,10,.08);
  --maxw:1080px; font-family:"Noto Sans","Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);line-height:1.55}
a{color:inherit}
h1,h2{line-height:1.15;letter-spacing:-.01em}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:1rem;
  max-width:var(--maxw);margin:0 auto;padding:1rem 1.25rem}
.brand{display:flex;align-items:center;gap:.5rem;font-weight:800;font-size:1.25rem;text-decoration:none}
.logo{display:grid;place-items:center;width:2rem;height:2rem;background:var(--red);color:#fff;border-radius:.5rem;font-weight:700}
nav{display:flex;gap:1.25rem;flex-wrap:wrap}
nav a{text-decoration:none;color:var(--muted);font-weight:600}
nav a:hover{color:var(--red)}

.hero{max-width:var(--maxw);margin:1rem auto 2rem;padding:0 1.25rem;display:grid;
  grid-template-columns:1.1fr .9fr;gap:2rem;align-items:center}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.75rem;color:var(--red);font-weight:700;margin:0}
.hero h1{font-size:clamp(1.8rem,4vw,3rem);margin:.4rem 0}
.lede{color:var(--muted);font-size:1.1rem;max-width:34ch}
.cta-row{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:1.25rem}
.btn{display:inline-block;padding:.7rem 1.1rem;border-radius:.6rem;font-weight:700;text-decoration:none;border:2px solid transparent;cursor:pointer;font-size:1rem}
.btn.primary{background:var(--red);color:#fff}
.btn.primary:hover{background:#a51f25}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn.ghost:hover{border-color:var(--red);color:var(--red)}
.hero-video{margin:0}
.hero-video video{width:100%;border-radius:1rem;box-shadow:var(--shadow);background:#000;aspect-ratio:16/9}
.hero-video figcaption{color:var(--muted);font-size:.9rem;margin-top:.5rem}

main{max-width:var(--maxw);margin:0 auto;padding:0 1.25rem 4rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:1rem;padding:1.5rem;margin:1.5rem 0;box-shadow:var(--shadow)}
h2{font-size:1.4rem;margin:.2rem 0 1rem}
.sub{color:var(--muted);margin-top:-.4rem}

.today .phrase{display:flex;align-items:center;gap:1rem;margin:.5rem 0}
.hanzi{font-size:3rem;font-weight:700}
.meta{display:flex;flex-direction:column}
.pinyin{font-size:1.3rem;color:var(--red);font-weight:700}
.gloss{color:var(--muted)}
.note{color:var(--muted);font-size:.95rem;border-left:3px solid var(--gold);padding-left:.8rem}

.play{width:2.6rem;height:2.6rem;border-radius:50%;border:none;background:var(--gold);color:#1c1a17;font-size:1rem;cursor:pointer;flex:0 0 auto}
.play:hover{background:#c4920f}
.play.playing{background:var(--red);color:#fff}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:1rem}
.lesson{display:flex;flex-direction:column;gap:.2rem;padding:1rem;border:1px solid var(--line);border-radius:.8rem;text-decoration:none;background:#fff;transition:transform .08s}
.lesson:hover{transform:translateY(-2px);border-color:var(--red)}
.lesson .num{font-size:.8rem;color:var(--muted);font-weight:700}
.lesson .cn{font-size:1.6rem;font-weight:700}
.lesson .en{color:var(--muted)}
.lesson.disabled{opacity:.5;pointer-events:none}

.flash{perspective:1000px;max-width:320px;margin:1rem auto}
.flash-inner{position:relative;width:100%;height:180px;transition:transform .5s;transform-style:preserve-3d;cursor:pointer}
.flash.flipped .flash-inner{transform:rotateY(180deg)}
.flash-front,.flash-back{position:absolute;inset:0;display:grid;place-items:center;border-radius:1rem;backface-visibility:hidden;border:2px solid var(--line);background:#fff}
.flash-front{font-size:3rem;font-weight:700}
.flash-back{transform:rotateY(180deg);font-size:1.4rem;color:var(--red);font-weight:700;text-align:center;padding:1rem}
.flash-controls{display:flex;gap:.75rem;justify-content:center;align-items:center;margin-top:1rem}
.counter{color:var(--muted);font-size:.9rem}

.tone-row{display:grid;grid-template-columns:repeat(4,1fr);gap:.75rem}
.tone{display:flex;flex-direction:column;gap:.2rem;align-items:center;padding:1rem .5rem;border:1px solid var(--line);border-radius:.8rem;background:#fff;cursor:pointer}
.tone:hover{border-color:var(--red)}
.tone .t{font-size:1.5rem;font-weight:700}
.tone .d{color:var(--gold);font-weight:700;font-size:.85rem}
.tone .g{color:var(--muted);font-size:.85rem}
.quiz{margin-top:1.25rem;padding-top:1rem;border-top:1px dashed var(--line)}
.quiz-opts{display:flex;gap:.5rem;flex-wrap:wrap;margin:.5rem 0}
.quiz-opts button{padding:.5rem .9rem;border:1px solid var(--line);border-radius:.5rem;background:#fff;cursor:pointer;font-weight:700}
.quiz-opts button:hover{border-color:var(--red)}
.quiz-result{font-weight:700;min-height:1.4rem}
.quiz-result.ok{color:#2f8f3e}.quiz-result.no{color:var(--red)}

.drill-list{list-style:none;padding:0;display:grid;gap:.6rem}
.drill-list li{display:flex;align-items:center;gap:.8rem;padding:.5rem;border-bottom:1px solid var(--line)}

footer{border-top:1px solid var(--line);background:#fff}
footer p{max-width:var(--maxw);margin:0 auto;padding:1.5rem 1.25rem;color:var(--muted)}

@media(max-width:760px){.hero{grid-template-columns:1fr}.tone-row{grid-template-columns:repeat(2,1fr)}}