:root{--bg: #ffffff;--panel: #ffffff;--ink: #1c1917;--muted: #78716c;--line: #e5e7eb;--accent: rgb(57, 100, 254);--accent-ink: #ffffff;--danger: #b91c1c;--ok: #166534;--shadow: 0 1px 0 rgba(28, 25, 23, .04);font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;color:var(--ink);background:#fff}*{box-sizing:border-box}body{margin:0;min-height:100vh}#root{min-height:100vh}.app{max-width:720px;margin:0 auto;padding:12px 14px 28px}.nav{display:flex;gap:8px;margin-bottom:14px;padding:6px;background:#fff;border:1px solid var(--line);border-radius:12px}.nav a{flex:1;text-align:center;text-decoration:none;color:var(--muted);padding:8px 10px;border-radius:8px;font-weight:600}.nav a.active{background:var(--accent);color:var(--accent-ink)}.page-header h1{margin:0 0 6px;font-size:1.35rem;letter-spacing:.02em}.page-header p{margin:0 0 14px;color:var(--muted);font-size:.9rem;line-height:1.45}.toolbar{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.btn{border:1px solid 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