:root{--color-bg: #ffffff;--color-surface: #f5f5f5;--color-surface-alt: #eaeaea;--color-text: #1a1a1a;--color-text-muted: #666666;--color-border: #e0e0e0;--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-primary-text: #ffffff;--color-input-bg: #ffffff;--color-input-border: #d1d5db;--color-code-bg: #f3f4f6;--color-success: #16a34a;--color-warning: #d97706;--color-error: #dc2626;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow: 0 1px 3px rgba(0, 0, 0, .1);--shadow-lg: 0 4px 12px rgba(0, 0, 0, .1);--radius: 6px;--radius-lg: 10px}[data-theme=dark]{--color-bg: #0f0f0f;--color-surface: #1a1a1a;--color-surface-alt: #242424;--color-text: #e5e5e5;--color-text-muted: #a0a0a0;--color-border: #333333;--color-primary: #3b82f6;--color-primary-hover: #60a5fa;--color-primary-text: #ffffff;--color-input-bg: #262626;--color-input-border: #404040;--color-code-bg: #1e1e1e;--color-success: #22c55e;--color-warning: #f59e0b;--color-error: #ef4444;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow: 0 1px 3px rgba(0, 0, 0, .4);--shadow-lg: 0 4px 12px rgba(0, 0, 0, .4)}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--color-bg: #0f0f0f;--color-surface: #1a1a1a;--color-surface-alt: #242424;--color-text: #e5e5e5;--color-text-muted: #a0a0a0;--color-border: #333333;--color-primary: #3b82f6;--color-primary-hover: #60a5fa;--color-primary-text: #ffffff;--color-input-bg: #262626;--color-input-border: #404040;--color-code-bg: #1e1e1e;--color-success: #22c55e;--color-warning: #f59e0b;--color-error: #ef4444;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow: 0 1px 3px rgba(0, 0, 0, .4);--shadow-lg: 0 4px 12px rgba(0, 0, 0, .4)}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:var(--color-bg);color:var(--color-text);line-height:1.6;min-height:100vh}h1,h2,h3,h4{line-height:1.3;font-weight:600}h1{font-size:1.75rem}h2{font-size:1.35rem}h3{font-size:1.1rem}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}code{background:var(--color-code-bg);padding:.15em .4em;border-radius:3px;font-size:.9em;font-family:SF Mono,Fira Code,monospace}input,select,textarea,button{font-family:inherit;font-size:inherit}input[type=number],input[type=text],select,textarea{background:var(--color-input-bg);color:var(--color-text);border:1px solid var(--color-input-border);border-radius:var(--radius);padding:.5rem .75rem}input[type=number]:focus,input[type=text]:focus,select:focus,textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 2px #3b82f633}.btn-primary{background:var(--color-primary);color:var(--color-primary-text);border:none;border-radius:var(--radius);padding:.65rem 1.25rem;font-weight:500;cursor:pointer;transition:background .15s;width:100%}.btn-primary:hover:not(:disabled){background:var(--color-primary-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--color-surface-alt);color:var(--color-text);border:1px solid var(--color-border);border-radius:var(--radius);padding:.5rem 1rem;cursor:pointer;transition:background .15s}.btn-secondary:hover:not(:disabled){background:var(--color-border)}.btn-secondary:disabled{opacity:.4;cursor:not-allowed}.btn-text{background:none;border:none;color:var(--color-primary);cursor:pointer;font-size:.85rem}.btn-text:hover{text-decoration:underline}.nav{display:flex;align-items:center;justify-content:space-between;padding:.75rem 1.5rem;background:var(--color-surface);border-bottom:1px solid var(--color-border)}.nav-brand{font-weight:700;font-size:1.1rem;color:var(--color-text)}.nav-brand:hover{text-decoration:none}.nav-links{display:flex;align-items:center;gap:1.25rem}.nav-link{color:var(--color-text-muted);font-size:.9rem;font-weight:500;transition:color .15s}.nav-link:hover{color:var(--color-text);text-decoration:none}.nav-link.active{color:var(--color-primary)}.theme-toggle{background:none;border:1px solid var(--color-border);border-radius:var(--radius);width:34px;height:34px;display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative}.theme-toggle-icon:before{content:"";display:block;width:18px;height:18px;border-radius:50%;background:var(--color-text-muted);transition:clip-path .3s}[data-theme=dark] .theme-toggle-icon:before{clip-path:polygon(0% 0%,100% 0%,100% 100%,0% 100%);border-radius:50%;background:transparent;box-shadow:inset -6px -2px 0 0 var(--color-text-muted)}[data-theme=light] .theme-toggle-icon:before,:root:not([data-theme]) .theme-toggle-icon:before{clip-path:circle(50% at 50% 50%)}