:root{--bg: #f4f7f6;--card: #fff;--ink: #1d2a2a;--muted: #6b7b7a;--line: #e2e9e7;--brand: #0f766e;--brand-soft: #e6f4f2;--good: #16a34a;--good-soft: #e9f8ee;--bad: #dc2626;--bad-soft: #fdecec;--warn: #d97706;--warn-soft: #fff4dc}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--ink);font-family:Be Vietnam Pro,system-ui,sans-serif;-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}h1,h2,h3{margin:0 0 8px;line-height:1.3}h1{font-size:24px}h2{font-size:19px}h3{font-size:16px;margin-top:14px}p{margin:8px 0;line-height:1.55}.muted{color:var(--muted)}.small{font-size:13.5px}.center{text-align:center}.grow{flex:1;min-width:0}.app{max-width:680px;margin:0 auto;min-height:100vh;padding:0 14px 96px}.top{display:flex;align-items:center;justify-content:space-between;padding:16px 2px 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0}.sent{background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 10px 10px 12px;transition:background .2s}.sent.playing{background:var(--brand-soft);border-color:var(--brand)}.sent-head{display:flex;align-items:center;gap:10px;cursor:pointer}.vi-s{font-size:15px}.en-s{font-size:15px;color:var(--brand);font-weight:600;margin-top:2px}.pill{font-size:11px;padding:2px 8px;border-radius:99px;white-space:nowrap}.pill.good{background:var(--good-soft);color:var(--good)}.pill.bad{background:var(--bad-soft);color:var(--bad)}.vocab{list-style:none;padding:10px 12px;margin:10px 0 0;background:var(--warn-soft);border-radius:12px;font-size:14px;line-height:1.6}.vocab b{color:#92400e}.session{padding-top:6px}.s-top{display:flex;align-items:center;gap:10px;padding:8px 0;position:sticky;top:0;background:var(--bg);z-index:3}.s-title{font-weight:700;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.s-top 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