:root{--primary:#2563eb;--primary-hover:#1d4ed8;--primary-light:#3b82f6;--primary-subtle:#eff6ff;--success:#16a34a;--success-subtle:#f0fdf4;--warning:#d97706;--warning-subtle:#fffbeb;--error:#dc2626;--error-subtle:#fef2f2;--info:#0284c7;--info-subtle:#f0f9ff;--bg:#fff;--bg-secondary:#f8fafc;--bg-tertiary:#f1f5f9;--bg-overlay:rgba(15,23,42,.5);--text:#0f172a;--text-secondary:#475569;--text-tertiary:#94a3b8;--text-inverse:#fff;--text-disabled:#cbd5e1;--border:#e2e8f0;--border-strong:#cbd5e1;--border-focus:#2563eb;--shadow-xs:0 1px 2px 0 rgba(0,0,0,.05);--shadow-sm:0 1px 3px 0 rgba(0,0,0,.1),0 1px 2px -1px rgba(0,0,0,.1);--shadow-md:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -2px rgba(0,0,0,.1);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -4px rgba(0,0,0,.1);--shadow-xl:0 20px 25px -5px rgba(0,0,0,.1),0 8px 10px -6px rgba(0,0,0,.1);--radius-xs:2px;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-2xl:24px;--radius-full:9999px;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-8:32px;--space-10:40px;--space-12:48px;--space-16:64px;--font-sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,sans-serif;--font-mono:"JetBrains Mono","Fira Code","Cascadia Code",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;--text-xs:0.75rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--text-4xl:2.25rem;--leading-tight:1.25;--leading-snug:1.375;--leading-normal:1.5;--leading-relaxed:1.625;--transition-fast:150ms cubic-bezier(0.4,0,0.2,1);--transition-base:200ms cubic-bezier(0.4,0,0.2,1);--transition-slow:300ms cubic-bezier(0.4,0,0.2,1);--z-base:0;--z-raised:10;--z-dropdown:100;--z-sticky:200;--z-modal:300;--z-toast:400;--z-tooltip:500}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;text-size-adjust:100%;-moz-tab-size:2;tab-size:2;scroll-behavior:smooth}body,html{line-height:var(--leading-normal)}body{font-family:var(--font-sans);font-size:var(--text-base);color:var(--text);background-color:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;font-feature-settings:"kern" 1,"liga" 1;min-height:100dvh;overflow-x:hidden}img,svg,video{display:block;max-width:100%}img{height:auto}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer;border:none;background:none}a{color:var(--primary);text-decoration:underline;text-underline-offset:3px;transition:color var(--transition-fast)}a:hover{color:var(--primary-hover)}h1,h2,h3,h4,h5,h6{line-height:var(--leading-tight);font-weight:600;color:var(--text)}p{line-height:var(--leading-relaxed)}code,kbd,pre,samp{font-family:var(--font-mono);font-size:.9em}pre{overflow-x:auto;white-space:pre}hr{border:none;border-top:1px solid var(--border);margin:var(--space-6) 0}ol,ul{padding-left:var(--space-6)}li{line-height:var(--leading-relaxed)}table{border-collapse:collapse;width:100%}td,th{text-align:left;padding:var(--space-2) var(--space-3);border-bottom:1px solid var(--border)}th{font-weight:600;background-color:var(--bg-secondary)}summary{cursor:pointer;-webkit-user-select:none;-moz-user-select:none;user-select:none}[hidden]{display:none!important}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}::-webkit-scrollbar-corner{background:transparent}*{scrollbar-width:thin;scrollbar-color:var(--border-strong) transparent}:focus{outline:none}:focus-visible{outline:2px solid var(--border-focus);outline-offset:2px;border-radius:var(--radius-sm)}a:focus-visible,button:focus-visible{border-radius:var(--radius-sm)}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}@keyframes shimmer{0%{background-position:-200%}to{background-position:200%}}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}@keyframes bounce{0%,80%,to{transform:translateY(0);opacity:.4}40%{transform:translateY(-5px);opacity:1}}@keyframes reasoningExpand{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:fadeIn var(--transition-slow) both}.animate-slide-up{animation:slideUp var(--transition-slow) both}.animate-pulse{animation:pulse 2s ease-in-out infinite}.animate-spin{animation:spin 1s linear infinite}.skeleton{background:linear-gradient(90deg,var(--bg-tertiary) 25%,var(--bg-secondary) 50%,var(--bg-tertiary) 75%);background-size:200% 100%;animation:shimmer 1.5s ease-in-out infinite;border-radius:var(--radius-sm)}@media (min-width:640px){:root{--text-4xl:2.5rem}}@media (min-width:768px){:root{--text-4xl:2.75rem}}@media (min-width:1024px){:root{--text-4xl:3rem}}@media (prefers-reduced-motion:reduce){*,:after,:before{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}@media print{*,:after,:before{background:transparent!important;color:#000!important;box-shadow:none!important;text-shadow:none!important}body{font-size:12pt;line-height:1.5}a,a:visited{text-decoration:underline}a[href]:after{content:" (" attr(href) ")";font-size:.85em;color:#555!important}a[href^="#"]:after,a[href^="javascript:"]:after{content:""}blockquote,figure,h1,h2,h3,pre,table{page-break-inside:avoid;break-inside:avoid}h1,h2,h3{page-break-after:avoid;break-after:avoid}.katex{color:#000!important}.no-print,aside,nav{display:none!important}}