:root{--bg:#f4f6fa;--card:#fff;--ink:#1f2733;--sub:#5b6573;--line:#e3e8ef;--brand:#2f6df0;--brand-soft:#eaf1ff;--green:#1f9d57;--green-soft:#e8f7ee;--red:#e23b3b;--red-soft:#fdecec;--amber:#c8821a;--amber-soft:#fdf3e0;--purple:#7c4dff;--purple-soft:#f1ebff;--blue2:#0e9f6e}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:-apple-system,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;font-size:15px}.topbar{position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid var(--line);padding:10px 16px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}.brand{font-weight:700;font-size:16px;white-space:nowrap}.subjects{display:flex;gap:6px;flex:1;flex-wrap:wrap}.subjects button{border:1px solid var(--line);background:#fff;color:var(--sub);border-radius:18px;padding:5px 13px;cursor:pointer;font-size:13.5px}.subjects 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