:root{--ink: #1c2b3a;--muted: #6b7c8f;--line: #e3e9f0;--bg: #f6f8fb;--brand: #007ee6;--brand-dark: #00589f}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font:14px/1.7 Microsoft YaHei,PingFang SC,Helvetica Neue,Arial,sans-serif}.topbar{display:flex;align-items:center;justify-content:space-between;padding:0 28px;height:56px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.brand{display:flex;align-items:baseline;gap:10px}.logo{color:var(--brand);font-size:20px}.brand-name{font-weight:700;font-size:16px}.brand-sub{color:var(--muted);font-size:12px}.upload-btn{font-size:13px;padding:6px 14px;border:1px solid var(--line);border-radius:6px;cursor:pointer;background:#fff}.upload-btn:hover{border-color:var(--brand);color:var(--brand)}main{max-width:1200px;margin:0 auto;padding:32px 24px 80px}.landing{padding-top:6vh}.dropzone{background:#fff;border:2px dashed #c4d2e2;border-radius:14px;padding:56px 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