:root{--navbar-height:50px;--color-primary:#2563EB;--color-primary-dark:#1D4ED8;--color-primary-light:#3B82F6;--color-secondary:#7C3AED;--color-tertiary:#F59E0B;--color-bg:#F8FAFC;--color-surface:#FFFFFF;--color-border:#E2E8F0;--color-border-light:#F1F5F9;--color-text:#0F172A;--color-text-secondary:#475569;--color-text-muted:#94A3B8;--color-java:#F97316;--color-go:#06B6D4;--color-mysql:#EAB308;--color-redis:#DC2626;--color-docker:#2563EB;--color-linux:#22C55E;--color-python:#3B82F6;--color-k8s:#6366F1;--color-git:#F97316;--space-1:0.25rem;--space-2:0.5rem;--space-3:0.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--radius-sm:0.375rem;--radius-md:0.5rem;--radius-lg:0.75rem;--radius-xl:1rem;--shadow-sm:0 1px 2px rgba(15, 23, 42, 0.04);--shadow-md:0 4px 6px -1px rgba(15, 23, 42, 0.06);--shadow-lg:0 10px 15px -3px rgba(15, 23, 42, 0.08);--transition-fast:150ms cubic-bezier(0.4, 0, 0.2, 1);--transition-normal:300ms cubic-bezier(0.4, 0, 0.2, 1)}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:noto sans sc,-apple-system,BlinkMacSystemFont,segoe ui,sans-serif;color:var(--color-text);background:var(--color-bg);line-height:1.6;-webkit-font-smoothing:antialiased;padding-top:var(--navbar-height,60px)}a{text-decoration:none;color:inherit}ul,ol{list-style:none}img{max-width:100%;display:block}.container{max-width:1200px;margin:0 auto;padding:0 var(--space-6)}.navbar{background:linear-gradient(to bottom,#EFF6FF 0%,#DBEAFE 100%);position:fixed;top:0;left:0;right:0;z-index:100;backdrop-filter:blur(8px);transition:transform .3s ease;padding-top:env(safe-area-inset-top,0px)}.navbar.navbar-hidden{transform:translateY(-100%)}.navbar-inner{max-width:1200px;margin:0 auto;padding:var(--space-2)var(--space-6);display:flex;align-items:center;justify-content:space-between;gap:var(--space-8)}.navbar-logo{font-size:1.125rem;font-weight:700;color:var(--color-text);display:flex;align-items:center;gap:var(--space-3)}.navbar-logo .logo-img{height:40px;width:auto}.navbar-links{display:flex;align-items:center;gap:var(--space-1)}.navbar-link{padding:var(--space-2)var(--space-4);border-radius:var(--radius-md);font-size:.9rem;font-weight:500;color:var(--color-text-secondary);transition:all var(--transition-fast);cursor:pointer;border:none;background:0 0}.navbar-link:hover{color:var(--color-primary);background:rgba(37,99,235,8%)}.navbar-link.active{color:var(--color-primary);background:rgba(37,99,235,.12)}.dropdown{position:relative}.dropdown-btn{padding:var(--space-2)var(--space-4);border-radius:var(--radius-md);font-size:.9rem;font-weight:500;color:var(--color-text-secondary);background:0 0;border:none;cursor:pointer;transition:all var(--transition-fast);display:flex;align-items:center;gap:var(--space-1)}.dropdown-btn:hover{color:var(--color-primary);background:rgba(37,99,235,8%)}.dropdown-btn .arrow{font-size:.7rem;transition:transform var(--transition-fast)}.dropdown-btn.active .arrow{transform:rotate(180deg)}.mega-menu{position:fixed;top:64px;left:50%;transform:translateX(-50%)translateY(-8px);width:90vw;max-width:1400px;max-height:85vh;overflow-y:auto;background:var(--color-surface);border-radius:var(--radius-xl);border:1px solid var(--color-border);box-shadow:var(--shadow-xl);padding:var(--space-5);z-index:9999;display:flex;gap:var(--space-5);align-items:flex-start;visibility:hidden;opacity:0;pointer-events:none;transition:visibility 0s .18s,opacity .18s ease,transform .18s ease}.mega-menu.open{visibility:visible;opacity:1;pointer-events:auto;transform:translateX(-50%)translateY(0);transition:visibility 0s 0s,opacity .18s ease,transform .18s ease}.mega-menu-category{min-width:0}.mega-menu-columns{display:flex;gap:0}.mega-menu-column{width:180px;flex-shrink:0}.mega-menu-column-title{font-size:.75rem;font-weight:700;color:var(--color-primary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--space-2);padding-bottom:var(--space-1);border-bottom:2px solid var(--color-primary-light)}.mega-menu-item{display:flex;align-items:center;gap:var(--space-2);padding:4px var(--space-2);border-radius:var(--radius-sm);text-decoration:none;transition:background var(--transition-fast)}.mega-menu-item:hover{background:var(--color-border-light)}.mega-menu-item-icon{width:24px;height:24px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:.75rem;flex-shrink:0}.mega-menu-item-icon i.iconfont{font-size:12px;color:#fff}.mega-menu-item-name{font-size:.8rem;color:var(--color-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mobile-subject-panel{position:fixed;top:0;left:0;right:0;bottom:0;background:var(--color-bg);z-index:1000;flex-direction:column;overflow:hidden;transform:translateY(100%);opacity:0;visibility:hidden;transition:transform .3s ease,opacity .3s ease,visibility 0s .3s}.mobile-subject-panel.open{display:flex;transform:translateY(0);opacity:1;visibility:visible;transition:transform .3s ease,opacity .3s ease}.mobile-panel-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-4)var(--space-5);background:var(--color-surface);border-bottom:1px solid var(--color-border);flex-shrink:0}.mobile-panel-title{font-size:1.1rem;font-weight:700;color:var(--color-text)}.mobile-panel-close{width:32px;height:32px;border-radius:50%;border:none;background:var(--color-border-light);color:var(--color-text);font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center}.mobile-panel-close:hover{background:var(--color-border)}.mobile-panel-search{padding:var(--space-3)var(--space-5);background:var(--color-surface);border-bottom:1px solid var(--color-border);flex-shrink:0}.mobile-search-input{width:100%;padding:var(--space-2)var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:.95rem;background:var(--color-bg);color:var(--color-text);outline:none}.mobile-search-input:focus{border-color:var(--color-primary)}.mobile-panel-body{flex:1;overflow-y:auto;padding:var(--space-4)var(--space-5)}.mobile-category-group{margin-bottom:var(--space-4)}.mobile-category-group.hidden{display:none}.mobile-category-title{font-size:.85rem;font-weight:700;color:var(--color-primary);margin-bottom:var(--space-2);padding-left:var(--space-1)}.mobile-subject-item{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2);border-radius:var(--radius-md);text-decoration:none;transition:background var(--transition-fast)}.mobile-subject-item:hover{background:var(--color-border-light)}.mobile-subject-item.hidden{display:none}.mobile-subject-icon{width:36px;height:36px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}.mobile-subject-icon i.iconfont{font-size:18px;color:#fff}.mobile-subject-name{font-size:.95rem;color:var(--color-text);font-weight:500}@keyframes slideUp{from{transform:translateY(100%);opacity:0}to{transform:translateY(0);opacity:1}}.navbar-mobile-toggle{display:none;background:0 0;border:none;font-size:1.5rem;cursor:pointer;color:var(--color-text);padding:var(--space-2)}.hero{padding:var(--space-8)0;background:linear-gradient(to bottom,#DBEAFE 0%,#DBEAFE 80px,var(--color-bg) 240px);position:relative}.hero-inner{display:grid;grid-template-columns:1fr 340px;gap:var(--space-10);align-items:center}.hero-text{flex-shrink:0}.hero-qr-group{display:flex;gap:var(--space-4);align-items:flex-start;justify-content:center}.hero-qr{display:flex;flex-direction:column;align-items:center;gap:var(--space-1);padding:var(--space-3);background:var(--color-surface);border-radius:var(--radius-lg);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);width:150px;transition:box-shadow var(--transition-fast)}.hero-qr:hover{box-shadow:var(--shadow-md)}.hero-qr-badge{font-size:.7rem;font-weight:600;padding:2px 8px;border-radius:20px;white-space:nowrap}.hero-qr-badge--green{background:#dcfce7;color:#16a34a}.hero-qr-badge--blue{background:#dbeafe;color:#2563eb}.hero-qr-title{font-size:.85rem;font-weight:700;color:var(--color-text);text-align:center;line-height:1.3}.hero-qr-image{width:100px;height:100px;border-radius:var(--radius-sm);overflow:hidden;background:var(--color-border-light);display:flex;align-items:center;justify-content:center}.hero-qr-image img{width:100%;height:100%;object-fit:cover}.hero-qr-desc{font-size:.72rem;color:var(--color-text-muted);line-height:1.5;text-align:center;white-space:nowrap}.phone-fixed-wrapper{position:fixed;top:335px;right:24px;z-index:90;width:240px}.phone-fixed-wrapper .hero-app-preview{display:flex;justify-content:center;align-items:flex-start;padding:0}.phone-fixed-wrapper .phone-mockup{position:relative;width:240px;overflow:visible;filter:drop-shadow(0 30px 50px -15px rgba(37,99,235,.3))drop-shadow(0 10px 20px -5px rgba(0,0,0,.1))}.hero-title{font-size:clamp(2rem,4vw,2.5rem);font-weight:800;color:var(--color-text);margin-bottom:var(--space-4);line-height:1.2;letter-spacing:-.02em}.hero-title .highlight{color:var(--color-primary)}.hero-subtitle{font-size:1rem;color:var(--color-text-secondary);max-width:480px;margin-bottom:var(--space-6);line-height:1.7}.hero-app-preview{display:flex;justify-content:center;align-items:flex-start;padding:var(--space-2)0;position:sticky;top:100px}.phone-mockup{position:relative;width:240px;overflow:visible;filter:drop-shadow(0 30px 50px -15px rgba(37,99,235,.3))drop-shadow(0 10px 20px -5px rgba(0,0,0,.1))}.phone-body{position:relative;width:100%;aspect-ratio:9/19.5;background:linear-gradient(145deg,#2a2a3e 0%,#1a1a2e 40%,#16213e 100%);border-radius:36px;padding:8px;box-shadow:inset 0 1px rgba(255,255,255,8%),inset 0 -1px rgba(0,0,0,.4),0 0 0 1px rgba(255,255,255,6%);overflow:visible}.phone-screen{width:100%;height:100%;border-radius:28px;overflow:hidden;position:relative;background:#000;box-shadow:inset 1px 1px 3px rgba(255,255,255,6%),inset -1px -1px 2px rgba(0,0,0,.3);image-rendering:-webkit-optimize-contrast;image-rendering:crisp-edges}.phone-screen img{width:100%;height:100%;object-fit:cover;display:block;transform:scale(1.02);image-rendering:auto;-webkit-font-smoothing:antialiased}.phone-island{position:absolute;top:10px;left:50%;transform:translateX(-50%);width:100px;height:28px;background:#000;border-radius:20px;z-index:10;display:flex;align-items:center;justify-content:center;gap:6px;box-shadow:inset 0 1px 2px rgba(255,255,255,.1)}.phone-island-camera{width:10px;height:10px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#2d4a7a,#1a1a2e);border:1px solid rgba(255,255,255,.1)}.phone-island-sensor{width:6px;height:6px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#2a3a5a,#111)}.phone-screen img{width:100%;height:100%;object-fit:cover;display:block}.phone-home-indicator{position:absolute;bottom:8px;left:50%;transform:translateX(-50%);width:100px;height:4px;background:rgba(255,255,255,.8);border-radius:2px;z-index:10}.phone-btn-volume{position:absolute;left:-3px;top:90px;width:3px;height:40px;background:linear-gradient(to right,#2a2a3e,#1a1a2e);border-radius:2px 0 0 2px;box-shadow:inset -1px 0 1px rgba(255,255,255,.1)}.phone-btn-volume::after{content:'';position:absolute;left:0;top:50px;width:3px;height:20px;background:linear-gradient(to right,#2a2a3e,#1a1a2e);border-radius:2px 0 0 2px;box-shadow:inset -1px 0 1px rgba(255,255,255,.1)}.phone-btn-power{position:absolute;right:-3px;top:80px;width:3px;height:35px;background:linear-gradient(to left,#2a2a3e,#1a1a2e);border-radius:0 2px 2px 0;box-shadow:inset 1px 0 1px rgba(255,255,255,.1)}.phone-btn-silent{position:absolute;left:-2px;top:60px;width:2px;height:20px;background:#1a1a2e;border-radius:2px 0 0 2px}.section{padding:var(--space-10)0}.section+.section{padding-top:0}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-5)}.section-title{font-size:1.25rem;font-weight:700;color:var(--color-text);display:flex;align-items:center;gap:var(--space-2)}.section-title::before{content:'';width:4px;height:1.25rem;background:var(--color-primary);border-radius:2px}.section-desc{font-size:.875rem;color:var(--color-text-muted);margin-top:var(--space-1)}.section-link{font-size:.875rem;color:var(--color-primary);font-weight:600;display:flex;align-items:center;gap:var(--space-1);transition:all var(--transition-fast)}.section-link:hover{gap:var(--space-2)}.list{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:var(--space-5);padding:var(--space-2)0}.icon-large{width:56px;height:56px;border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;font-size:1.75rem;flex-shrink:0;margin-right:var(--space-5)}.icon-large i.iconfont{font-size:28px;color:#fff}.info{flex:1;min-width:0}.name{font-size:1.1rem;font-weight:700;color:var(--color-text);margin-bottom:var(--space-1)}.desc{font-size:.875rem;color:var(--color-text-muted);line-height:1.5}.stats{display:flex;gap:var(--space-6);margin-left:var(--space-6);flex-shrink:0}.stat{text-align:center}.stat-num{font-size:1.25rem;font-weight:800;color:var(--color-primary);display:block}.stat-label{font-size:.75rem;color:var(--color-text-muted)}.arrow{width:22px;height:22px;border-radius:50%;background:var(--color-border-light);display:flex;align-items:center;justify-content:center;margin-left:var(--space-4);color:var(--color-text-muted);transition:all var(--transition-fast)}.list-item:hover .arrow{background:var(--color-primary);color:#fff;transform:translateX(4px)}.list-item{display:flex;flex-direction:column;padding:var(--space-5);gap:var(--space-4);border-radius:var(--radius-lg);border:1px solid var(--color-border);background:var(--color-surface);transition:all var(--transition-fast);box-shadow:var(--shadow-xs)}.list-item:hover{border-color:var(--color-primary-light);box-shadow:var(--shadow-md);transform:translateY(-2px)}.list-item-top{display:flex;gap:var(--space-4);align-items:flex-start}.list-item-top .icon-large{flex-shrink:0;margin-right:0}.list-item-info{flex:1;min-width:0}.list-item-info .name{margin-bottom:var(--space-1);font-size:1.1rem}.list-item-info .desc{font-size:.85rem;line-height:1.6;color:var(--color-text-muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.list-item-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:var(--space-4)}.list-item-bottom .stats{display:flex;gap:var(--space-6);flex:1;justify-content:center}.list-item-bottom .arrow{flex-shrink:0;margin-left:var(--space-4)}@media(min-width:768px){.list-item{padding:var(--space-6)}.list-item-info .desc{-webkit-line-clamp:1}.list-item-bottom .stats{gap:var(--space-8)}}.error-page{min-height:calc(100vh - 200px);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-8)var(--space-5);text-align:center}.error-page .error-code{font-size:8rem;font-weight:800;line-height:1;background:linear-gradient(135deg,#3b82f6,#2563eb);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--space-4)}.error-page .error-title{font-size:1.75rem;font-weight:700;color:var(--color-text);margin-bottom:var(--space-3)}.error-page .error-desc{font-size:1rem;color:var(--color-text-muted);max-width:400px;margin:0 auto var(--space-6);line-height:1.6}.error-page .error-actions{display:flex;gap:var(--space-4);flex-wrap:wrap;justify-content:center}.error-page .btn{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-3)var(--space-6);border-radius:var(--radius-lg);font-size:1rem;font-weight:600;text-decoration:none;transition:all var(--transition-fast)}.error-page .btn-primary{background:var(--color-primary);color:#fff}.error-page .btn-primary:hover{background:var(--color-primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-md)}.error-page .btn-outline{background:0 0;color:var(--color-text);border:2px solid var(--color-border)}.error-page .btn-outline:hover{border-color:var(--color-primary);color:var(--color-primary)}.error-page .error-illustration{margin-bottom:var(--space-6)}.error-page .error-illustration svg{width:200px;height:auto}.error-page .error-illustration svg rect,.error-page .error-illustration svg text,.error-page .error-illustration svg path,.error-page .error-illustration svg circle{transition:all .3s ease}.error-page:hover .error-illustration svg rect:first-of-type{fill:#cbd5e1}.qr-float{position:fixed;right:24px;top:120px;z-index:100;background:var(--color-surface);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);padding:var(--space-4);text-align:center;width:180px;border:1px solid var(--color-border);transition:all var(--transition-normal)}.qr-float:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.qr-float-title{font-size:.9rem;font-weight:600;color:var(--color-text);margin-bottom:var(--space-2)}.qr-float-qr{width:120px;height:120px;background:var(--color-border-light);border-radius:var(--radius-md);display:inline-flex;align-items:center;justify-content:center;font-size:4rem;margin-bottom:var(--space-2)}.qr-float-close{position:absolute;top:8px;right:8px;width:20px;height:20px;border-radius:50%;border:none;background:var(--color-border-light);color:var(--color-text-muted);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:.8rem;transition:all var(--transition-fast)}.qr-float-close:hover{background:var(--color-border);color:var(--color-text)}.qr-float.hidden{display:none}@media(max-width:1024px){.qr-float{display:none}}.footer{background:var(--color-text);color:#fff;padding:var(--space-12)0 var(--space-6);margin-top:var(--space-12)}.footer-inner{max-width:1200px;margin:0 auto;padding:0 var(--space-6)}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:var(--space-8);margin-bottom:var(--space-8)}.footer-brand{font-size:1.1rem;font-weight:700;margin-bottom:var(--space-3)}.footer-desc{font-size:.85rem;color:rgba(255,255,255,.6);line-height:1.6}.footer-title{font-size:.85rem;font-weight:600;margin-bottom:var(--space-4);opacity:.8}.footer-links li{margin-bottom:var(--space-2)}.footer-links a{font-size:.85rem;color:rgba(255,255,255,.6);transition:color var(--transition-fast)}.footer-links a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:var(--space-6);display:flex;align-items:center;justify-content:space-between;font-size:.8rem;color:rgba(255,255,255,.5);flex-wrap:wrap;gap:var(--space-4)}.qr-modal{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(15,23,42,.7);z-index:1000;align-items:center;justify-content:center}.qr-modal.active{display:flex}.qr-modal-inner{background:#fff;border-radius:var(--radius-xl);padding:var(--space-8);text-align:center;max-width:340px;width:90%}.qr-modal-title{font-size:1.25rem;font-weight:700;margin-bottom:var(--space-4);color:var(--color-text)}.qr-modal-code{width:180px;height:180px;background:var(--color-border-light);border-radius:var(--radius-lg);display:inline-flex;align-items:center;justify-content:center;font-size:5rem;margin-bottom:var(--space-4)}.qr-modal-desc{font-size:.9rem;color:var(--color-text-secondary);margin-bottom:var(--space-6)}.qr-modal-btn{background:var(--color-primary);color:#fff;border:none;padding:var(--space-3)var(--space-8);border-radius:var(--radius-md);font-weight:600;cursor:pointer;width:100%}@media(max-width:1024px){.phone-fixed-wrapper{display:none}}@media(max-width:768px){:root{--navbar-height:64px}body{padding-top:calc(var(--navbar-height) + env(safe-area-inset-top,0px))}.hero-inner{grid-template-columns:1fr;gap:var(--space-6)}.hero-qr-group{max-width:100%;justify-content:center}.hero-qr{width:140px}.hero-qr-image{width:90px;height:90px}.navbar-links{display:none}.navbar-links.open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:var(--color-surface);border-bottom:1px solid var(--color-border);padding:var(--space-4);gap:var(--space-2)}.mega-menu{display:none!important}.navbar-mobile-toggle{display:block}.footer-grid{grid-template-columns:1fr 1fr 1fr;gap:var(--space-4)}.footer-grid>div:first-child{grid-column:1/-1}}@media(max-width:480px){.container{padding:0 var(--space-4)}.footer-grid{grid-template-columns:1fr 1fr 1fr;gap:var(--space-3)}.footer-grid>div:first-child{grid-column:1/-1}.arrow{display:none}.hero-qr-group{flex-direction:row;align-items:flex-start;justify-content:center}}:root{--color-text-primary:var(--color-text);--color-white:var(--color-surface);--color-primary-bg:#EFF6FF;--color-accent-orange:#F59E0B;--color-accent-purple:#7C3AED;--color-qr-bg:#1E3A8A;--color-success:#10B981;--space-16:4rem;--shadow-xl:0 20px 25px -5px rgba(0,0,0,0.1)}@keyframes fadeIn{from{opacity:0}to{opacity:1}}.subject-hero-inner{display:flex;align-items:center;gap:var(--space-6)}.subject-hero-icon{width:80px;height:80px;border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;font-size:2.5rem;flex-shrink:0}.subject-hero-icon i.iconfont{font-size:40px;color:#fff}.subject-hero-info{flex:1}.subject-hero-title{font-size:2rem;font-weight:800;color:var(--color-text-primary);margin-bottom:var(--space-2)}.subject-hero-desc{font-size:1.05rem;color:var(--color-text-secondary);line-height:1.7}.subject-hero-stats{display:flex;gap:var(--space-8)}.subject-hero-stat{text-align:center}.subject-hero-stat-num{font-size:1.75rem;font-weight:800;color:var(--color-primary)}.subject-hero-stat-label{font-size:.85rem;color:var(--color-text-secondary)}.tabs-section{padding:var(--space-8)0 0}.tabs{display:flex;gap:var(--space-2);border-bottom:2px solid var(--color-border);padding:0 var(--space-4)}.tab{padding:var(--space-3)var(--space-6);font-size:1rem;font-weight:600;color:var(--color-text-secondary);cursor:pointer;border:none;background:0 0;position:relative;transition:color 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var(--transition-normal);cursor:pointer;display:flex;gap:var(--space-5);align-items:flex-start;margin-bottom:var(--space-4)}.exam-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:transparent}.exam-card-icon{width:56px;height:56px;border-radius:var(--radius-lg);background:linear-gradient(135deg,var(--color-accent-purple) 0%,#A78BFA 100%);display:flex;align-items:center;justify-content:center;font-size:1.5rem;flex-shrink:0;color:#fff}.exam-card-content{flex:1}.exam-card-title{font-size:1.15rem;font-weight:700;color:var(--color-text-primary);margin-bottom:var(--space-2)}.exam-card-desc{font-size:.9rem;color:var(--color-text-secondary);margin-bottom:var(--space-3);line-height:1.6}.exam-card-meta{display:flex;gap:var(--space-5);font-size:.85rem;color:var(--color-text-secondary)}.exam-card-meta 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var(--space-2);border-radius:var(--radius-sm);transition:all var(--transition-fast);text-decoration:none;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-cat-link:hover{color:var(--color-primary);background:var(--color-border-light)}.sidebar-cat-link.active{color:var(--color-primary);background:var(--color-primary-bg);font-weight:600}.sidebar-level-header{display:flex;align-items:center;gap:4px;padding:4px var(--space-2);cursor:pointer;border-radius:var(--radius-sm);transition:all var(--transition-fast);user-select:none}.sidebar-level-header:hover{background:var(--color-border-light)}.sidebar-level-arrow{font-size:.6rem;color:var(--color-text-muted);flex-shrink:0}.sidebar-level-name{font-size:.83rem;font-weight:700;color:var(--color-text)}.sidebar-level-body{padding-left:var(--space-3);margin-top:2px}.sidebar-cat-group{margin-bottom:4px}.sidebar-cat-title{font-size:.7rem;font-weight:600;color:var(--color-text-muted);padding:2px var(--space-2)1px;text-transform:uppercase;letter-spacing:.03em}@media(max-width:1024px){.tab-content-with-sidebar{flex-direction:column}.article-sidebar{position:fixed!important;top:0!important;left:-280px!important;bottom:0!important;width:280px!important;z-index:10000!important;border-radius:0!important;border-right:1px solid var(--color-border)!important;transition:left .3s ease!important;overflow-y:auto!important;max-height:none!important;background:var(--color-surface)!important}.article-sidebar.sidebar-open{left:0!important}.article-main-content{max-width:100%}}.sidebar-toggle{display:none;align-items:center;justify-content:center;width:44px;height:44px;border:1px solid var(--color-border);border-radius:50%;background:var(--color-surface);color:var(--color-text);cursor:pointer;font-size:1.1rem;flex-shrink:0;transition:all var(--transition-fast);box-shadow:0 2px 8px 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var(--color-border-light);display:flex;align-items:center;gap:var(--space-2)}.article-group-title::before{content:'';width:4px;height:1.35rem;background:var(--color-primary);border-radius:2px;flex-shrink:0}.content-card{background:var(--color-white);border-radius:var(--radius-xl);border:1px solid var(--color-border);overflow:hidden;cursor:pointer;transition:all var(--transition-normal)}.content-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:transparent}.content-card-img{height:70px;display:flex;align-items:flex-end;justify-content:flex-start;font-size:2rem;position:relative;padding:var(--space-4);box-sizing:border-box}.content-card-img::after{content:'';position:absolute;bottom:0;left:0;right:0;height:70%;pointer-events:none}.content-card-badge{position:absolute;top:var(--space-3);right:var(--space-3);padding:2px 10px;border-radius:99px;font-size:.75rem;font-weight:600;z-index:2}.badge-article{background:rgba(0,0,0,.65)!important;color:#fff!important;font-weight:700!important;box-shadow:0 2px 8px rgba(0,0,0,.25)!important;backdrop-filter:blur(8px)!important;letter-spacing:.5px!important}.badge-topic{background:rgba(0,0,0,.65)!important;color:#fff!important;font-weight:700!important;box-shadow:0 2px 8px rgba(0,0,0,.25)!important;backdrop-filter:blur(8px)!important;letter-spacing:.5px!important}.list-item-info .name .badge{display:inline-block;padding:2px 8px;border-radius:4px;font-size:.7rem;font-weight:600;margin-left:8px;vertical-align:middle;line-height:1.3}.badge-top{background:linear-gradient(135deg,#ef4444 0%,#dc2626 100%);color:#fff}.badge-recommend{background:linear-gradient(135deg,#f59e0b 0%,#d97706 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span{display:flex;align-items:center;gap:var(--space-1)}.detail-body{font-size:1.05rem;line-height:1.8;color:var(--color-text-primary)}.detail-body h2{font-size:1.5rem;font-weight:700;margin:var(--space-8)0 var(--space-4);color:var(--color-text-primary)}.detail-body h3{font-size:1.25rem;font-weight:700;margin:var(--space-6)0 var(--space-3);color:var(--color-text-primary)}.detail-body p{margin-bottom:var(--space-4)}.detail-body pre{background:#1f2937;color:#f9fafb;padding:var(--space-5);border-radius:var(--radius-lg);overflow-x:auto;margin:var(--space-4)0;font-size:.9rem;line-height:1.6}.detail-body code{background:var(--color-primary-bg);color:var(--color-primary);padding:2px 6px;border-radius:var(--radius-sm);font-size:.9em}.topic-summary{background:var(--color-white);border-radius:var(--radius-xl);padding:var(--space-8);margin-bottom:var(--space-8);border:1px solid 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var(--transition-fast)}.exercise-card:hover{border-color:var(--color-primary-light);box-shadow:var(--shadow-sm)}.exercise-num{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background:var(--color-primary-bg);color:var(--color-primary);font-weight:700;font-size:.9rem;margin-bottom:var(--space-3)}.exercise-question{font-size:1.05rem;font-weight:600;color:var(--color-text-primary);margin-bottom:var(--space-4);line-height:1.6}.exercise-options{display:flex;flex-direction:column;gap:var(--space-3);margin-bottom:var(--space-4)}.exercise-option{display:flex;align-items:flex-start;gap:var(--space-3);padding:var(--space-3)var(--space-4);border:1px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.exercise-option:hover{border-color:var(--color-primary);background:var(--color-primary-bg)}.exercise-option-label{width:24px;height:24px;border-radius:50%;background:var(--color-bg);display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:600;color:var(--color-text-secondary);flex-shrink:0}.exam-header{background:var(--color-white);border-radius:var(--radius-xl);padding:var(--space-6);margin-bottom:var(--space-6);border:1px solid var(--color-border)}.exam-header-meta{display:flex;gap:var(--space-5);font-size:.9rem;color:var(--color-text-secondary);margin-bottom:var(--space-4);flex-wrap:wrap}.exam-header-meta span{display:flex;align-items:center;gap:var(--space-1)}.exam-progress{height:8px;background:var(--color-bg);border-radius:99px;overflow:hidden}.exam-progress-bar{height:100%;background:linear-gradient(90deg,var(--color-primary),var(--color-accent-purple));border-radius:99px;transition:width 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auto;line-height:1.7}.about-content{padding:var(--space-16)0;background:var(--color-bg)}.about-section{max-width:800px;margin:0 auto var(--space-12);padding:0 var(--space-4)}.about-section-title{font-size:1.5rem;font-weight:700;color:var(--color-text-primary);margin-bottom:var(--space-4)}.about-section-text{font-size:1.05rem;color:var(--color-text-secondary);line-height:1.8}.about-qr-section{text-align:center}.about-qr-section .about-section-desc{font-size:.95rem;color:var(--color-text-secondary);margin-bottom:var(--space-6)}.about-qr-section .hero-qr-group{justify-content:center}.footer{background:var(--color-white);border-top:1px solid var(--color-border);padding:var(--space-12)0 var(--space-6);margin-top:var(--space-16)}.footer-inner{max-width:1200px;margin:0 auto;padding:0 var(--space-4)}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:var(--space-8);margin-bottom:var(--space-8)}.footer-brand{font-size:1.1rem;font-weight:700;color:var(--color-primary);margin-bottom:var(--space-3)}.footer-desc{font-size:.9rem;color:var(--color-text-secondary);line-height:1.7}.footer-title{font-size:.95rem;font-weight:700;color:var(--color-text-primary);margin-bottom:var(--space-4)}.footer-links li{margin-bottom:var(--space-2)}.footer-links a{font-size:.9rem;color:var(--color-text-secondary);transition:color var(--transition-fast)}.footer-links a:hover{color:var(--color-primary)}.footer-bottom{border-top:1px solid var(--color-border);padding-top:var(--space-6);display:flex;align-items:center;justify-content:space-between;font-size:.85rem;color:var(--color-text-secondary);flex-wrap:wrap;gap:var(--space-4)}.qr-modal{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.6);z-index:1000;align-items:center;justify-content:center}.qr-modal.active{display:flex}.qr-modal-inner{background:#fff;border-radius:1rem;padding:2rem;text-align:center;max-width:360px;width:90%}.qr-modal-title{font-size:1.25rem;font-weight:700;margin-bottom:1rem;color:var(--color-text-primary)}.qr-modal-code{width:200px;height:200px;background:var(--color-bg);border-radius:1rem;display:inline-flex;align-items:center;justify-content:center;font-size:5rem;margin-bottom:1rem;border:2px dashed var(--color-border)}.qr-modal-desc{font-size:.95rem;color:var(--color-text-secondary);margin-bottom:1.5rem}.qr-modal-btn{background:var(--color-primary);color:#fff;border:none;padding:.75rem 2rem;border-radius:.5rem;font-weight:600;cursor:pointer;width:100%}@media(max-width:768px){.subject-hero-inner{flex-direction:column;text-align:center}.subject-hero-stats{justify-content:center}.tabs{overflow-x:auto;-webkit-overflow-scrolling:touch}.footer-grid{grid-template-columns:1fr 1fr 1fr;gap:var(--space-4)}.footer-grid>div:first-child{grid-column:1/-1}.exam-card{flex-direction:column}}@media(max-width:480px){.grid{grid-template-columns:1fr}.featured-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr 1fr;gap:var(--space-3)}.footer-grid>div:first-child{grid-column:1/-1}.detail-title{font-size:1.5rem}}@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.detail-body table{width:100%;border-collapse:collapse;margin:var(--space-4)0;font-size:.95rem}.detail-body th,.detail-body td{padding:10px 14px;border:1px solid var(--color-border);text-align:left}.detail-body th{background:var(--color-border-light);font-weight:700}.detail-body tr:nth-child(even){background:var(--color-bg)}.detail-body pre{background:#272822;color:#f8f8f2;border:1px solid #2d2d2d;border-radius:var(--radius-lg);padding:var(--space-5);overflow-x:auto;margin:var(--space-4)0;line-height:1.6;font-size:.9rem}.detail-body pre code{background:0 0!important;padding:0;color:inherit!important;font-size:inherit;border-radius:0}.detail-body code{background:var(--color-primary-bg);color:var(--color-primary);padding:2px 6px;border-radius:var(--radius-sm);font-size:.9em}.katex{font-size:1.1em}.katex-display{margin:var(--space-4)0;overflow-x:auto;overflow-y:hidden;padding:4px 0}.katex .katex-html{display:inline-block}.tab-nav{display:flex;gap:var(--space-2);margin-bottom:var(--space-6);padding-bottom:var(--space-2);overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;scrollbar-width:none}.tab-nav::-webkit-scrollbar{display:none}.tab-item{padding:var(--space-3)var(--space-5);border:2px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);color:var(--color-text-secondary);font-size:.95rem;font-weight:600;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;flex-shrink:0}.tab-item:hover{border-color:var(--color-primary-light);color:var(--color-primary);background:rgba(37,99,235,4%)}.tab-item.active{border-color:var(--color-primary);color:var(--color-primary);background:rgba(37,99,235,8%);box-shadow:0 2px 4px rgba(37,99,235,.12)}.tab-panel{display:none;animation:fadeIn .3s ease}.tab-panel.active{display:block}.tab-panel .list{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1rem;padding:1.5rem 0}.tab-panel .list-item{background:var(--color-white)}.tab-panel .list-item:hover{background:var(--color-primary-bg)}@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.article-detail-layout{display:flex;flex-direction:column;margin-top:var(--space-6)}.article-detail-layout>.article-sidebar{position:fixed;top:0;left:-280px;bottom:0;width:280px;z-index:10000;background:var(--color-surface);border-right:1px solid var(--color-border);overflow-y:auto;transition:left .3s ease;scrollbar-width:thin}.article-detail-layout>.article-sidebar.sidebar-open{left:0}.sidebar-backdrop{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);z-index:9999}.sidebar-backdrop.backdrop-visible{display:block}.article-detail-layout>.article-main-content{max-width:100%;padding:var(--space-5);background:var(--color-surface);border-radius:var(--radius-lg);border:1px solid var(--color-border-light)}@media(min-width:1025px){.sidebar-toggle{display:none!important}.sidebar-backdrop{display:none!important}.article-detail-layout{flex-direction:row;align-items:flex-start;gap:var(--space-6)}.article-detail-layout>.article-sidebar{position:sticky;top:80px;left:auto;bottom:auto;width:220px;max-height:calc(100vh - 120px);overflow-y:auto;padding:var(--space-4);background:var(--color-surface);border:1px solid var(--color-border-light);border-radius:var(--radius-lg);flex-shrink:0;z-index:auto;transition:none}.article-detail-layout>.article-sidebar.sidebar-open{left:auto}.article-detail-layout>.article-main-content{flex:1;min-width:0;max-width:960px;padding:var(--space-8)}}.sidebar-article-link{display:block;padding:6px var(--space-3);border-radius:var(--radius-sm);font-size:.85rem;color:var(--color-text-secondary);text-decoration:none;transition:all var(--transition-fast);margin-bottom:2px;line-height:1.4}.sidebar-article-link:hover{color:var(--color-primary);background:var(--color-primary-bg)}.sidebar-article-link.active{color:var(--color-primary);background:var(--color-primary-bg);font-weight:600;border-left:3px solid var(--color-primary);padding-left:calc(var(--space-3) - 3px)}.article-detail-layout>.article-main-content{flex:1;min-width:0;max-width:960px;background:var(--color-surface);padding:var(--space-8);border-radius:var(--radius-lg);border:1px solid var(--color-border-light)}.article-nav{display:flex;gap:var(--space-4);margin-top:var(--space-10);padding-top:var(--space-6);border-top:2px solid var(--color-border-light)}.article-nav-prev{flex:1;text-align:left}.article-nav-next{flex:1;text-align:right}.article-nav-link{display:block;padding:var(--space-4)var(--space-5);border-radius:var(--radius-lg);border:1px solid var(--color-border);background:var(--color-bg);text-decoration:none;transition:all var(--transition-fast);height:100%}.article-nav-link:hover{border-color:var(--color-primary-light);background:var(--color-primary-bg);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.article-nav-label{display:block;font-size:.8rem;color:var(--color-text-muted);margin-bottom:var(--space-1);font-weight:500}.article-nav-title{display:block;font-size:.95rem;color:var(--color-text);font-weight:600;line-height:1.4}@media(max-width:768px){.article-detail-layout{flex-direction:column}.article-detail-layout>.article-sidebar{position:fixed!important;top:0!important;left:-280px!important;bottom:0!important;width:280px!important;z-index:10000!important;border-radius:0!important;border-right:1px solid var(--color-border)!important;transition:left .3s ease!important;overflow-y:auto!important;max-height:none!important;background:var(--color-surface)!important}.article-detail-layout>.article-sidebar.sidebar-open{left:0!important}.article-detail-layout>.article-main-content{max-width:100%;padding:var(--space-5)}}@media(max-width:768px){.article-nav{flex-direction:column}.article-nav-prev,.article-nav-next{text-align:left}}