:root{--ink:#18333f;--muted:#647982;--accent:#17687b;--line:#dbe4e8;--paper:#fff;--bg:#f3f6f7;--warn:#fff4d8;--error:#a62d33;--radius:8px;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);font-size:15px;line-height:1.5}*{box-sizing:border-box}body{margin:0}header{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:18px 30px;background:var(--paper);border-bottom:1px solid var(--line)}.brand{font-size:21px;font-weight:750;text-decoration:none;color:var(--ink)}.brand span{font-weight:400;font-size:13px;display:block;color:var(--muted)}.account{display:flex;gap:16px;align-items:center;font-size:13px}nav{display:flex;gap:26px;background:white;padding:12px 30px;border-bottom:1px solid var(--line)}nav a{text-decoration:none}main{padding:26px 30px;max-width:1700px;margin:auto;min-height:70vh}h1{font-size:27px;line-height:1.2;margin:0 0 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