:root{--ink: #17243a;--muted: #667085;--line: #e5e7eb;--paper: #f9fafb;--white: #ffffff;--teal: #0f8f8c;--teal-dark: #0b6567;--amber: #d89126;--red: #bf4436;--blue: #2d5f9a;--shadow: 0 4px 24px rgba(0, 0, 0, .08);font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif;color:var(--ink);background:var(--white)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px}button,input,select{font:inherit}a{color:inherit;text-decoration:none}.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;min-height:72px;padding:0 clamp(18px,4vw,72px);border-bottom:1px solid var(--line);background:var(--white)}.brand{display:flex;gap:12px;align-items:center}.brand-mark{display:flex;justify-content:center;align-items:center;width:44px;height:44px;border-radius:10px;background:#2d5f9a;color:#fff;font-weight:900;font-size:22px;letter-spacing:-1px}.brand strong,.brand em{display:block}.brand 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