:root{--color-primary: #0070f3;--color-primary-hover: #0060d0;--color-primary-light: rgba(0, 112, 243, .08);--color-bg: #ffffff;--color-bg-secondary: #f8f9fa;--color-bg-icon: #f0f4ff;--color-text: #1a1a1a;--color-text-secondary: #555;--color-text-muted: #888;--color-border: #e5e7eb;--color-border-light: #eee;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--shadow-card: 0 1px 3px rgba(0,0,0,.04);--shadow-card-hover: 0 4px 16px rgba(0,0,0,.08);--transition-fast: .15s ease;--transition-med: .25s ease;--header-height: 56px;--footer-height: 60px;--max-width: 1000px;--font-mono: "Fira Code", "Cascadia Code", ui-monospace, monospace;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--color-primary: #3b9eff;--color-primary-hover: #5aafff;--color-primary-light: rgba(59, 158, 255, .12);--color-bg: #0f1117;--color-bg-secondary: #1a1d27;--color-bg-icon: #1e2536;--color-text: #e4e4e7;--color-text-secondary: #a1a1aa;--color-text-muted: #71717a;--color-border: #2e3039;--color-border-light: #23252e;--shadow-card: 0 1px 3px rgba(0,0,0,.2);--shadow-card-hover: 0 4px 16px rgba(0,0,0,.3)}}[data-theme=dark]{--color-primary: #3b9eff;--color-primary-hover: #5aafff;--color-primary-light: rgba(59, 158, 255, .12);--color-bg: #0f1117;--color-bg-secondary: #1a1d27;--color-bg-icon: #1e2536;--color-text: #e4e4e7;--color-text-secondary: #a1a1aa;--color-text-muted: #71717a;--color-border: #2e3039;--color-border-light: #23252e;--shadow-card: 0 1px 3px rgba(0,0,0,.2);--shadow-card-hover: 0 4px 16px rgba(0,0,0,.3)}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:var(--font-sans);font-size:16px;line-height:1.6;color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}.site-header{border-bottom:1px solid var(--color-border-light);background:var(--color-bg);position:sticky;top:0;z-index:100}.site-nav{max-width:var(--max-width);margin:0 auto;padding:0 1rem;height:var(--header-height);display:flex;align-items:center;gap:1.5rem}.site-brand{font-weight:700;font-size:1.15rem;color:var(--color-text);white-space:nowrap}.nav-tools{display:flex;gap:1rem;flex-wrap:nowrap;flex:1 1 0;min-width:0;overflow:hidden}.nav-tools a{color:var(--color-text-secondary);font-size:.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}.nav-tools a:hover{color:var(--color-primary)}.theme-toggle{background:none;border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:.25rem .35rem;cursor:pointer;color:var(--color-text-secondary);display:flex;align-items:center;flex-shrink:0;transition:color var(--transition-fast),border-color var(--transition-fast)}.theme-toggle:hover{color:var(--color-primary);border-color:var(--color-primary)}.theme-icon{display:none}.theme-toggle[data-mode=light] .theme-icon--light,.theme-toggle[data-mode=dark] .theme-icon--dark{display:block}.theme-toggle[data-mode=system] .theme-icon--system,.theme-toggle:not([data-mode]) .theme-icon--system{display:block}.lang-switcher{flex-shrink:0;position:relative}.lang-trigger{display:flex;align-items:center;gap:.3rem;font-size:.85rem;font-family:var(--font-sans);color:var(--color-text-secondary);background:none;border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:.25rem .55rem;cursor:pointer;white-space:nowrap;line-height:1;transition:color var(--transition-fast),border-color var(--transition-fast)}.lang-trigger:hover,.lang-trigger[aria-expanded=true]{color:var(--color-primary);border-color:var(--color-primary)}.lang-chevron{transition:transform var(--transition-fast);flex-shrink:0}.lang-trigger[aria-expanded=true] .lang-chevron{transform:rotate(180deg)}.lang-menu{position:absolute;top:calc(100% + 6px);right:0;min-width:130px;background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:0 4px 16px #0000001a;overflow:hidden;z-index:200}.lang-option{display:block;padding:.5rem .85rem;font-size:.875rem;color:var(--color-text-secondary);text-decoration:none;transition:background var(--transition-fast),color var(--transition-fast)}.lang-option:hover{background:var(--color-bg-secondary);color:var(--color-primary);text-decoration:none}.lang-option--active{color:var(--color-primary);font-weight:600;background:var(--color-primary-light)}.lang-option--active:hover{background:var(--color-primary-light)}.nav-hamburger{display:none;background:none;border:none;cursor:pointer;padding:.5rem;color:var(--color-text);flex-shrink:0;min-width:44px;min-height:44px;align-items:center;justify-content:center}.nav-drawer{border-top:1px solid var(--color-border-light);padding:.75rem 1rem 1rem;background:var(--color-bg)}.nav-drawer-links{display:flex;flex-direction:column;gap:.25rem}.nav-drawer-links a{display:block;padding:.6rem .75rem;border-radius:var(--radius-sm);color:var(--color-text-secondary);font-size:.95rem;min-height:44px;display:flex;align-items:center}.nav-drawer-links a:hover{background:var(--color-bg-secondary);color:var(--color-primary);text-decoration:none}.nav-overlay{position:fixed;inset:0;top:var(--header-height);background:#0000004d;z-index:99}@media(max-width:640px){.nav-tools{display:none}.nav-hamburger{display:flex}.site-nav{overflow-x:visible}}@media(min-width:641px){.nav-drawer,.nav-overlay{display:none!important}}main{min-height:calc(100vh - var(--header-height) - var(--footer-height))}.site-footer{border-top:1px solid var(--color-border-light);text-align:center;padding:1rem;font-size:.85rem;color:var(--color-text-muted)}.site-footer a{color:var(--color-text-muted)}