:root{--bg: #f7f8fa;--surface: #ffffff;--ink: #1a1d24;--ink-secondary: #5a6072;--ink-tertiary: #9096a6;--line: #e4e7ee;--accent: #2563eb;--accent-ink: #ffffff;--danger: #dc2626;--ok: #059669;--radius: 12px;--shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);--font-sans: "PingFang SC", "HarmonyOS Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:var(--font-sans);background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;line-height:1.6}.shell{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100%;gap:8px;padding:24px}.shell-title{font-size:20px;font-weight:600;margin:0}.shell-note{color:var(--ink-secondary);font-size:14px;margin:0}.page{max-width:960px;margin:0 auto;padding:24px 20px 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