:root{--ink:#172019;--muted:#6e786f;--line:#dce3dc;--soft:#f4f7f2;--paper:#fff;--green:#245b3b;--green-2:#e6efe8;--warm:#b56a3c;--danger:#a33d35;--shadow:0 18px 55px rgba(30,53,36,.09)}*{box-sizing:border-box}body{margin:0;background:#f7f8f5;color:var(--ink);font-family:"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif}.topbar{height:72px;padding:0 max(28px,calc((100vw - 1340px)/2));display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:rgba(255,255,255,.92)}.brand{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none;font-family:STSong,SimSun,serif;font-size:20px;font-weight:700}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:50% 50% 50% 8px;background:var(--green);color:white;font-size:16px}.top-actions{display:flex;align-items:center;gap:12px}.session-state{font-size:12px;color:var(--muted)}.shell{max-width:1340px;margin:0 auto;padding:54px 28px 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