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240px;--header-height: 64px;--footer-height: 48px;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--border-radius: 4px;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;--transition-speed: .2s}[data-theme=dark]{--color-bg: #1a1a1a;--color-bg-secondary: #2d2d2d;--color-bg-tertiary: #3d3d3d;--color-border: #404040;--color-text: #e9ecef;--color-text-muted: #adb5bd;--color-text-inverse: #212529;--color-shadow: rgba(0, 0, 0, .3);--color-overlay: rgba(0, 0, 0, .7);--color-primary: #4a9eff;--color-primary-hover: #6bb1ff;--color-success: #40c463;--color-danger: #f85149;--color-warning: #d29922;--color-info: #58a6ff}body,.layout,.header,.sidebar,.main-content,.footer,.nav-list a,.form-group input,.form-group textarea,.form-group select,button,.btn-primary,.btn-secondary,.btn-danger{transition:background-color var(--transition-speed),color var(--transition-speed),border-color var(--transition-speed)}.theme-toggle{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);background-color:transparent;border:1px solid var(--color-border);border-radius:var(--border-radius);color:var(--color-text);cursor:pointer;font-size:14px;transition:all var(--transition-speed)}.theme-toggle:hover{background-color:var(--color-bg-secondary);border-color:var(--color-primary)}.theme-toggle-icon{font-size:18px;display:flex;align-items:center}[data-theme=dark] .nav-list a:hover{background-color:#ffffff1a}[data-theme=dark] .nav-list a.active{background-color:var(--color-primary);color:var(--color-text-inverse)}[data-theme=dark] input,[data-theme=dark] textarea,[data-theme=dark] select{background-color:var(--color-bg-secondary);color:var(--color-text);border-color:var(--color-border)}[data-theme=dark] input:focus,[data-theme=dark] textarea:focus,[data-theme=dark] select:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #4a9eff33}.header{display:flex;justify-content:space-between;align-items:center}.header-left,.header-right{display:flex;align-items:center;gap:var(--spacing-md)}