:root{--ink:#173f35;--paper:#f5f2e9;--card:#fffdf8;--line:#dcd7c9;--accent:#ef765f;--gold:#f7d76a;--muted:#63716c;--ok:#2c7a63;--shadow:0 14px 40px rgba(23,63,53,.09);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"PingFang SC",sans-serif;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0;min-height:100vh;padding-bottom:84px;background:radial-gradient(circle at 90% -10%,#ffe7ac 0,transparent 35%),var(--paper)}button,input{font:inherit}.topbar{height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 20px;position:sticky;top:0;z-index:5;background:rgba(245,242,233,.88);backdrop-filter:blur(14px);border-bottom:1px solid rgba(220,215,201,.7)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;letter-spacing:-.02em}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:var(--ink);color:var(--gold);font-family:Georgia,serif;font-size:22px}main{width:min(880px,100%);margin:auto;padding:24px 18px 48px}.bottom-nav{position:fixed;z-index:10;left:50%;bottom:max(12px,env(safe-area-inset-bottom));transform:translateX(-50%);width:min(520px,calc(100% - 24px));display:grid;grid-template-columns:repeat(4,1fr);padding:7px;background:#173f35;border-radius:18px;box-shadow:var(--shadow)}.bottom-nav a{padding:10px 4px;text-align:center;color:#d9e3df;text-decoration:none;font-size:13px;border-radius:12px}.bottom-nav a.active{background:#fff;color:var(--ink);font-weight:750}.hero{padding:8px 2px 20px}.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:800;color:var(--accent)}h1{font-family:Georgia,"Songti SC",serif;font-size:clamp(36px,10vw,64px);line-height:.98;letter-spacing:-.04em;margin:10px 0 16px;max-width:760px}h2{font-size:24px;margin:0 0 12px}h3{margin:0 0 8px}.lead{color:var(--muted);font-size:17px;line-height:1.65;max-width:660px}.grid{display:grid;gap:14px}.grid.two{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:var(--shadow)}.card.compact{padding:16px}.status-row,.split{display:flex;gap:12px;justify-content:space-between;align-items:center}.pill{display:inline-flex;padding:5px 9px;border-radius:999px;font-size:12px;font-weight:750;background:#e6ece8}.pill.preview{background:#fff0c7}.pill.pending{background:#ece9e0;color:#6d6b64}.notice{border-left:5px solid var(--gold);background:#fffbec;padding:14px 16px;border-radius:10px;margin:16px 0;line-height:1.55}.metric{font:700 30px Georgia,serif}.muted{color:var(--muted)}.button,button{border:0;border-radius:12px;padding:11px 14px;background:var(--ink);color:white;font-weight:700;cursor:pointer}.button.secondary,button.secondary{background:var(--gold);color:var(--ink)}button.quiet{background:transparent;color:var(--ink);border:1px solid var(--line)}button:disabled{opacity:.45;cursor:not-allowed}audio{width:100%;margin:12px 0}.transcript{max-height:330px;overflow:auto;border-top:1px solid var(--line);margin-top:14px;padding-top:8px}.segment{padding:11px 10px;border-radius:12px;line-height:1.45}.segment.active{background:#fff1c9}.segment .zh{display:block;color:var(--muted);font-size:14px;margin-top:3px}.controls{display:flex;flex-wrap:wrap;gap:9px;margin:10px 0}.progress-track{height:9px;background:#e6e2d7;border-radius:99px;overflow:hidden}.progress-track span{display:block;height:100%;background:var(--accent);border-radius:99px}.lesson-list{display:grid;gap:10px}.lesson-row{display:grid;grid-template-columns:52px 1fr auto;align-items:center;gap:12px;padding:14px;background:var(--card);border:1px solid var(--line);border-radius:16px}.day-number{width:46px;height:46px;border-radius:14px;background:#e7eee9;display:grid;place-items:center;font-weight:800}.day-number.review{background:#fff0c7}.tabs{display:flex;gap:8px;overflow:auto;margin:16px 0}.tabs button{white-space:nowrap}.tabs button:not(.active){background:#e6e2d7;color:var(--ink)}.quiz label{display:block;margin:8px 0;padding:11px;border:1px solid var(--line);border-radius:11px}.quiz input{margin-right:8px}.result{padding:10px;border-radius:10px;background:#e5f3ec}.settings-row{padding:16px 0;border-bottom:1px solid var(--line)}.loading{text-align:center;padding:80px 0}.fatal{color:#9c2e24;background:#fff0ed;padding:16px;border-radius:12px}@media(min-width:720px){main{padding-top:42px}.topbar{padding-inline:36px}.lesson-row{grid-template-columns:62px 1fr auto}.day-number{width:52px;height:52px}}