:root{--color-bg: #0d1117;--color-surface: #161b22;--color-border: #30363d;--color-text: #e6edf3;--color-text-muted: #8b949e;--color-accent: #e60012;--color-accent-hover:#c9000f;--sidebar-width: 280px;--header-height: 56px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--color-bg);color:var(--color-text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:15px;line-height:1.5;min-height:100vh}img{display:block;max-width:100%}a{color:inherit}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}