.header{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--header-h);background:var(--bg);border-bottom:1px solid var(--border);display:flex;flex-direction:column}.header-inner{display:flex;align-items:center;gap:16px;height:var(--header-h);padding:0 16px;max-width:1200px;margin:0 auto;width:100%}.header-logo{font-weight:700;font-size:1.125rem;letter-spacing:-.02em;white-space:nowrap;flex-shrink:0}.header-logo:hover{opacity:.8}.header-search{flex:1;max-width:420px;margin:0 auto}.header-actions{flex-shrink:0;display:flex;align-items:center;gap:8px}.header-search-mobile{display:none;padding:0 16px 12px}.theme-toggle{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-sm);color:var(--text-secondary);transition:background .15s,color .15s}.theme-toggle:hover{background:var(--bg-hover);color:var(--text)}@media(max-width:720px){.header{height:auto}.header-search{display:none}.header-search-mobile{display:block}main{padding-top:calc(var(--header-h) + 52px)!important}}:root{--bg: #ffffff;--bg-secondary: #f8f9fa;--bg-card: #ffffff;--bg-hover: #f1f3f5;--text: #111827;--text-secondary: #6b7280;--text-muted: #9ca3af;--border: #e5e7eb;--border-strong: #d1d5db;--accent: #111827;--accent-hover: #374151;--shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-lg: 0 4px 12px rgba(0, 0, 0, .08);--radius: 10px;--radius-sm: 6px;--header-h: 56px;--font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace}[data-theme=dark]{--bg: #0f1115;--bg-secondary: #161a20;--bg-card: #1a1e26;--bg-hover: #242830;--text: #f3f4f6;--text-secondary: #9ca3af;--text-muted: #6b7280;--border: #2a2e36;--border-strong: #3a3f4a;--accent: #f3f4f6;--accent-hover: #e5e7eb;--shadow: 0 1px 3px rgba(0, 0, 0, .3);--shadow-lg: 0 4px 12px rgba(0, 0, 0, .4)}*,*:before,*:after{box-sizing:border-box}html{font-size:16px;-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.5;min-height:100vh;-webkit-font-smoothing:antialiased}#root{min-height:100vh;display:flex;flex-direction:column}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;padding:0}input{font-family:inherit;color:inherit}img,svg{display:block;max-width:100%}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}