:root{--bg: #f4f6f8;--surface: #ffffff;--surface-2: #f9fafb;--border: #e2e6ea;--border-strong: #cdd4da;--text: #1c2430;--text-muted: #5b6672;--text-faint: #8a94a0;--primary: #1f5eff;--primary-hover: #1848c8;--sidebar-bg: #141b2b;--sidebar-text: #c3ccda;--sidebar-active: #1f5eff;--danger: #d64545;--danger-bg: #fdecec;--success: #1f9d55;--success-bg: #e8f6ee;--warn: #b7791f;--warn-bg: #fdf3e2;--radius: 6px;--shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;background:var(--bg);color:var(--text);font-family:var(--font);font-size:14px;line-height:1.45}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{margin:0 0 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