:root{--bg-primary:#0b0d14;--bg-secondary:#111322;--bg-card:#171a2c;--bg-card-hover:#1e2238;--bg-input:#0e1019;--accent:#4cc9f0;--accent-light:#72daf5;--accent-glow:rgba(76,201,240,0.22);--accent-bg:rgba(76,201,240,0.07);--accent2:#4361ee;--accent2-glow:rgba(67,97,238,0.18);--text-primary:#eef0f6;--text-secondary:#8d99b0;--text-muted:#5e6b82;--text-muted-p1:#3e4556;--border:rgba(255,255,255,0.07);--border-accent:rgba(76,201,240,0.25);--topbar-bg:rgba(11,13,20,0.82);--topbar-border:rgba(255,255,255,0.06);--topbar-height:58px;--footer-bg:var(--bg-secondary);--glow-orb-1:rgba(76,201,240,0.07);--glow-orb-2:rgba(67,97,238,0.05);--glow-orb-3:rgba(247,37,133,0.04);--radius:16px;--radius-sm:11px;--radius-xs:7px;--shadow-card:0 8px 32px rgba(0,0,0,0.35);--primary:#4361ee;--secondary:#3f37c9;--accent1:#e63ea2;--accent3:#7209b7;--light:#f8f9fa;--dark:#212529;--success:#2ec4b6;--warning:#ff9f1c;--gradient1:linear-gradient(135deg,#4361ee,#3a0ca3);--gradient2:linear-gradient(135deg,#f72585,#b5179e);--gradient3:linear-gradient(135deg,#4cc9f0,#4895ef);--shadow:0 10px 20px rgba(0,0,0,0.1);--shadow-sm:0 2px 4px rgba(0,0,0,0.06);--shadow-md:0 8px 30px rgba(0,0,0,0.12);--shadow-lg:0 20px 60px rgba(0,0,0,0.15);--shadow-xl:0 40px 80px rgba(0,0,0,0.2);--gradient-primary:linear-gradient(135deg,#2380dd 0%,#5884ed 100%);--chinese-color:#D32F2F;--chinese-light:#EF5350;--chinese-dark:#B71C1C;--math-color:#388E3C;--math-light:#4CAF50;--math-dark:#1B5E20;--english-color:#1976D2;--english-light:#2196F3;--english-dark:#0D47A1;--chemistry:#FF6F00;--physics:#0066FF;--start_sim:rgba(76,201,240,0.15);--subject-card-bg:rgba(23,26,44,0.85);--subject-card-active-bg:rgba(76,201,240,0.12);--search-bg:var(--bg-card);--search-border:var(--border);--suggestion-bg:var(--bg-card);--suggestion-hover:var(--accent-bg);--filter-container-bg:var(--bg-card);--page-link-bg:var(--bg-card);--page-link-border:var(--border);--page-link-active-bg:var(--accent);--page-link-active-border:var(--accent);--page-input-bg:var(--bg-input);--empty-icon-color:var(--text-muted);--footer_col_ul_li_a:#068df6}[data-theme="light"]{--bg-primary:#f4f2ee;--bg-secondary:#ffffff;--bg-card:#ffffff;--bg-card-hover:#f7f6f3;--bg-input:#eeece8;--accent:#3a8fd4;--accent-light:#5da8e2;--accent-glow:rgba(58,143,212,0.14);--accent-bg:rgba(58,143,212,0.06);--accent2:#3451c6;--accent2-glow:rgba(52,81,198,0.10);--text-primary:#1a1c2e;--text-secondary:#4a5568;--text-muted:#94a3b8;--text-muted-p1:#3c3f48;--border:rgba(0,0,0,0.08);--border-accent:rgba(58,143,212,0.22);--topbar-bg:rgba(244,242,238,0.86);--topbar-border:rgba(0,0,0,0.06);--footer-bg:#ffffff;--glow-orb-1:rgba(58,143,212,0.05);--glow-orb-2:rgba(52,81,198,0.04);--glow-orb-3:rgba(247,37,133,0.03);--shadow-card:0 8px 32px rgba(0,0,0,0.08);--start_sim:rgba(58,143,212,0.12);--subject-card-bg:rgba(255,255,255,0.9);--subject-card-active-bg:rgba(58,143,212,0.10);--search-bg:#ffffff;--search-border:rgba(0,0,0,0.1);--suggestion-bg:#ffffff;--suggestion-hover:rgba(58,143,212,0.06);--filter-container-bg:#ffffff;--page-link-bg:#ffffff;--page-link-border:rgba(0,0,0,0.1);--page-link-active-bg:var(--accent);--page-link-active-border:var(--accent);--page-input-bg:#f0eee9;--empty-icon-color:#94a3b8}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;width:100%;max-width:100%}body{background:var(--bg-primary);color:var(--text-primary);font-family:'Rubik','Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;line-height:1.6;min-height:100vh;display:flex;flex-direction:column;font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;transition:background-color .4s ease,color .4s ease}::selection{background:var(--accent);color:#fff}#particles-js{position:fixed;top:0;left:0;width:100%;height:100%;z-index:0;pointer-events:none}.ambient-glow{position:fixed;top:0;left:0;right:0;bottom:0;pointer-events:none;z-index:0;overflow:hidden}.ambient-glow .orb{position:absolute;border-radius:50%;filter:blur(120px);opacity:.5;animation:orbFloat 28s ease-in-out infinite;transition:background .5s}.ambient-glow .orb-1{width:550px;height:550px;background:radial-gradient(circle,var(--glow-orb-1),transparent 70%);top:-180px;left:-80px}.ambient-glow .orb-2{width:450px;height:450px;background:radial-gradient(circle,var(--glow-orb-2),transparent 70%);bottom:-120px;right:-60px;animation-delay:-14s}.ambient-glow .orb-3{width:350px;height:350px;background:radial-gradient(circle,var(--glow-orb-3),transparent 70%);top:38%;left:48%;animation-delay:-7s}@keyframes orbFloat{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(35px,-25px) scale(1.06)}66%{transform:translate(-25px,35px) scale(.93)}}.topbar{position:fixed;top:0;left:0;right:0;height:var(--topbar-height);background:var(--topbar-bg);border-bottom:1px solid var(--topbar-border);display:flex;align-items:center;padding:0 22px;z-index:1000;backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px);transition:background-color .4s,border-color .4s}.topbar::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,#4cc9f0,#4361ee,#f72585,#e63ea2,#7209b7,#4cc9f0);background-size:300% 100%;animation:rainbowSlide 6s linear infinite}@keyframes rainbowSlide{0%{background-position:0% 50%}100%{background-position:300% 50%}}.topbar-nav{display:flex;align-items:center;width:100%;height:100%;padding:0;background:transparent;border:none;box-shadow:none}.nav-container{display:flex;align-items:center;width:100%;height:100%}.topbar-nav-left{display:flex;align-items:center;gap:10px;margin-right:10px;flex-shrink:0}.topbar-nav-right{display:flex;align-items:center;gap:8px;flex-shrink:0}.topbar-logo{font-size:1.05rem;font-weight:900;letter-spacing:.4px;color:var(--accent)!important;text-decoration:none!important;display:flex;align-items:center;gap:6px;white-space:nowrap;transition:opacity .2s}.topbar-logo:hover{opacity:.85}.topbar-logo i{font-size:1.15rem}.theme-switcher{display:flex;align-items:center;gap:3px;background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:3px;transition:background-color .4s,border-color .4s}.theme-btn{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border:none;background:transparent;border-radius:7px;cursor:pointer;color:var(--text-muted);transition:all .2s}.theme-btn:hover{background:var(--accent-bg);color:var(--accent)}.theme-btn.active{background:var(--accent);color:#fff;box-shadow:0 2px 8px var(--accent-glow)}.theme-btn svg{width:16px;height:16px}.topbar-nav-toggler{display:none;align-items:center;justify-content:center;width:34px;height:34px;border:1px solid var(--border);background:var(--bg-card);border-radius:8px;color:var(--text-secondary);cursor:pointer;transition:all .2s;flex-shrink:0}.topbar-nav-toggler:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-bg)}.topbar-nav-toggler i{font-size:1.15rem}.mobile-toggler{display:none;align-items:center;justify-content:center;width:38px;height:38px;border:1px solid var(--border);background:var(--bg-card);border-radius:10px;color:var(--text-secondary);cursor:pointer;transition:all .2s}.mobile-toggler:hover{border-color:var(--accent2);color:var(--accent2)}.topbar .navbar-collapse{flex:1;justify-content:center;height:100%}.topbar .navbar-nav{align-items:center;gap:2px;height:100%}.topbar .navbar-nav .nav-link{color:var(--text-secondary);font-size:.94rem;font-weight:700;padding:6px 12px;margin:0;border-radius:var(--radius-xs);white-space:nowrap;display:flex;align-items:center;gap:5px;text-decoration:none;transition:color .2s,background .2s;position:relative}.topbar .navbar-nav .nav-link:hover,.topbar .navbar-nav .nav-link:focus{color:var(--text-primary);background:var(--accent-bg)}.topbar .navbar-nav .nav-link.active{color:var(--accent);background:var(--accent-bg)}.topbar .navbar-nav .nav-link i{font-size:.92rem}.hover-glow{position:relative;overflow:hidden}.hover-glow::after{content:'';position:absolute;inset:0;border-radius:inherit;background:radial-gradient(circle at var(--glow-x,50%) var(--glow-y,50%),var(--accent-glow),transparent 70%);opacity:0;transition:opacity .3s;pointer-events:none}.hover-glow:hover::after{opacity:1}.topbar .dropdown-toggle::after{border-top-color:var(--text-muted);margin-left:5px;vertical-align:middle;transition:transform .25s ease,border-color .2s}.topbar .dropdown-toggle:hover::after{border-top-color:var(--accent)}.topbar .dropdown-toggle.show::after{transform:rotate(180deg);border-top-color:var(--accent)}.topbar .dropdown-menu{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:0 8px 32px rgba(0,0,0,.35);backdrop-filter:blur(20px);padding:8px;min-width:220px;margin-top:6px!important;animation:dropdownFadeIn .2s ease}@keyframes dropdownFadeIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}.topbar .dropdown-item{color:var(--text-secondary);font-size:.94rem;font-weight:700;padding:6px 13px;border-radius:var(--radius-xs);transition:all .2s;display:flex;align-items:center;gap:5px}.topbar .dropdown-item:hover,.topbar .dropdown-item:focus{background:var(--accent-bg);color:var(--accent)}.topbar .dropdown-item i{font-size:.84rem;flex-shrink:0;width:18px;text-align:center}.topbar .dropdown-header{color:var(--text-muted);font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.8px;padding:10px 12px 4px}.topbar .dropdown-divider{border-color:var(--border);margin:4px 0}.main-content{flex:1 0 auto;width:100%;margin:0 auto;padding:0;position:relative;z-index:1;padding-top:var(--topbar-height)}.main-container{width:100%;max-width:1400px;box-sizing:border-box;margin:0 auto;padding:0 24px}.messages{position:fixed;top:calc(var(--topbar-height) + 16px);right:20px;z-index:1000;max-width:400px}.alert{padding:15px 20px;border-radius:12px;margin-bottom:15px;box-shadow:var(--shadow-lg);display:flex;align-items:center;animation:slideIn .3s ease,fadeOut .5s ease 3s forwards;backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,0.1)}.alert-success{background:linear-gradient(135deg,rgba(46,196,182,.95),rgba(46,196,182,.8));color:white}.alert-error{background:linear-gradient(135deg,rgba(230,62,162,.95),rgba(230,62,162,.8));color:white}.alert-info{background:linear-gradient(135deg,rgba(76,201,240,.95),rgba(76,201,240,.8));color:white}.alert-warning{background:linear-gradient(135deg,rgba(255,159,28,.95),rgba(255,159,28,.8));color:white}.alert i{margin-right:10px;font-size:1.2rem}@keyframes slideIn{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}@keyframes fadeOut{from{opacity:1}to{opacity:0}}.subject-filter-container{background:var(--filter-container-bg);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;margin-bottom:20px;transition:background-color .4s,border-color .4s,box-shadow .4s}.subject-scroll-wrapper{position:relative;overflow:hidden}.subject-scroll-content{display:flex;gap:12px;overflow-x:auto;scroll-behavior:smooth;padding:8px 4px;-webkit-overflow-scrolling:touch;scrollbar-width:none;align-items:flex-end}.subject-scroll-content::-webkit-scrollbar{display:none}.subject-scroll-content a:hover{transform:translateY(0);box-shadow:0 6px 16px rgb(6,141,246);border-color:rgb(18,197,163);background:rgba(255,255,255,0.06)}.subject-card{flex-shrink:0;width:100px;background:var(--subject-card-bg);border:2px solid var(--border);border-radius:var(--radius-sm);padding:12px 8px 8px;text-align:center;cursor:pointer;transition:all .3s ease;text-decoration:none!important;font-weight:bold;color:var(--text-secondary)!important;position:relative;overflow:hidden}.subject-card::before{content:'';position:absolute;inset:0;border-radius:inherit;background:radial-gradient(circle at var(--glow-x,50%) var(--glow-y,50%),var(--accent-glow),transparent 70%);opacity:0;transition:opacity .3s;pointer-events:none}.subject-card:hover::before{opacity:1}.subject-card:hover{background:var(--bg-card-hover);border-color:var(--accent);transform:translateY(-3px);color:var(--text-primary)!important}.subject-card.active{background:var(--subject-card-active-bg);border-color:var(--accent);box-shadow:0 0 16px var(--accent-glow);color:var(--accent)!important}.subject-card-body{display:flex;flex-direction:column;align-items:center;gap:4px}.subject-icon{font-size:1.6rem;color:var(--accent);transition:color .3s}.subject-name{font-size:.78rem;margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:85px;transition:color .3s}.subject-card .card-img-top{transition:transform .3s}.subject-card:hover .card-img-top{transform:scale(1.08)}.subject-card:active{transform:scale(.96);transition:transform .1s ease}.scroll-btn{position:absolute;top:50%;transform:translateY(-50%);width:36px;height:36px;border-radius:50%;background:var(--bg-card);border:1px solid var(--border);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:3;opacity:0;visibility:hidden;transition:all .3s;box-shadow:var(--shadow-md)}.scroll-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent)}.scroll-btn.show{opacity:1;visibility:visible}.scroll-btn-left{left:4px}.scroll-btn-right{right:4px}.scroll-hint{position:absolute;bottom:0;left:50%;transform:translateX(-50%);font-size:.72rem;color:var(--text-muted);opacity:0;transition:opacity .3s;pointer-events:none}.scroll-hint.show{opacity:1}.subject-scroll-content.touch-scrolling,.subject-scroll-content.dragging{cursor:grabbing;user-select:none}.subject-scroll-content.touch-active .subject-card{transition:none}.subject-scroll-content.keyboard-focus{outline:2px solid var(--accent);outline-offset:2px}.subject-scroll-wrapper::before,.subject-scroll-wrapper::after{content:'';position:absolute;top:0;bottom:0;width:28px;pointer-events:none;z-index:2;opacity:0;transition:opacity .3s}.subject-scroll-wrapper::before{left:0;background:linear-gradient(90deg,var(--bg-primary),transparent)}.subject-scroll-wrapper::after{right:0;background:linear-gradient(270deg,var(--bg-primary),transparent)}[data-theme="light"] .subject-scroll-wrapper::before{background:linear-gradient(90deg,#f4f2ee,transparent)}[data-theme="light"] .subject-scroll-wrapper::after{background:linear-gradient(270deg,#f4f2ee,transparent)}.subject-scroll-wrapper.scroll-left::before{opacity:1}.subject-scroll-wrapper.scroll-right::after{opacity:1}.subject-scroll-wrapper.scroll-middle::before,.subject-scroll-wrapper.scroll-middle::after{opacity:1}.search-bar-container{transition:background-color .4s}.popular-subjects-searches a:hover{transform:translateY(0);box-shadow:0 6px 16px rgb(136,36,230);border-color:rgb(208,23,214);background:rgba(255,255,255,0.06)}.search-form .input-group{background:var(--search-bg);border:1px solid var(--search-border);border-radius:50px;overflow:hidden;transition:border-color .3s,box-shadow .3s,background-color .4s}.search-form .input-group:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.search-form .input-group-text{background:transparent!important;border:none!important;color:var(--text-muted)!important;transition:color .3s}.search-form .form-control{background:transparent!important;border:none!important;color:var(--text-primary)!important;transition:color .3s}.search-form .form-control::placeholder{color:var(--text-muted)}.search-form .form-control:focus{box-shadow:none!important}.search-suggestions{display:none;position:absolute;top:100%;left:0;right:0;background:var(--suggestion-bg);border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);z-index:100;margin-top:4px;overflow:hidden;backdrop-filter:blur(16px);animation:dropdownFadeIn .2s ease;transition:background-color .4s,border-color .4s}.suggestions-header{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid var(--border)}.suggestions-list{max-height:320px;overflow-y:auto}.suggestion-item{display:flex;align-items:center;gap:12px;padding:10px 14px;color:var(--text-secondary);text-decoration:none;transition:background .15s,color .15s;cursor:pointer}.suggestion-item:hover,.suggestion-item.active{background:var(--suggestion-hover);color:var(--text-primary)}.suggestion-icon{width:32px;height:32px;border-radius:8px;background:var(--accent-bg);display:flex;align-items:center;justify-content:center;color:var(--accent);font-size:.9rem;flex-shrink:0}.suggestion-content{flex:1;min-width:0}.suggestion-title{font-size:.9rem;font-weight:600;display:flex;align-items:center;gap:6px}.suggestion-description{font-size:.78rem;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.suggestion-type{font-size:.65rem;padding:1px 6px;border-radius:4px;font-weight:700}.suggestion-type.simulation{background:rgba(76,201,240,0.15);color:var(--accent)}.suggestion-type.subject{background:rgba(67,97,238,0.15);color:var(--accent2)}.suggestion-type.hot{background:rgba(247,37,133,0.15);color:#f72585}.suggestions-footer{padding:8px 14px;border-top:1px solid var(--border);font-size:.75rem}.highlight{background:var(--accent-glow);color:var(--accent);padding:0 2px;border-radius:2px}.no-suggestions{padding:24px;text-align:center;color:var(--text-muted)}.no-suggestions i{font-size:1.5rem;margin-bottom:8px;display:block}.loading-indicator{position:absolute;right:60px;top:50%;transform:translateY(-50%)}.loading-indicator .spinner{width:18px;height:18px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.simulation-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:24px}.simulation-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:all .3s ease;position:relative}.simulation-card:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgb(228,98,27);border-color:rgb(227,65,219);background:rgba(255,255,255,0.06)}.simulation-card .card-body{padding:14px 16px;flex:1;text-align:center;transition:background-color .4s}.simulation-card .card-title{margin-top:8px;font-size:1.2em;font-weight:700;margin-bottom:6px;color:var(--accent3)!important;transition:color .3s;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.simulation-card .card-title i{color:var(--accent3)}.simulation-card .card-text{color:var(--text-muted)!important;font-size:.85rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color .3s}.difficulty-badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:.82rem;font-weight:700;letter-spacing:.3px;opacity:0.7}.simulation-card .card-footer{padding:10px 16px 14px;border-top:1px solid var(--border);background:transparent;display:flex;justify-content:center;transition:border-color .4s}.simulation-card .card-footer a{width:75%;text-align:center}.start-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;width:100%;padding:8px 16px;background:var(--start_sim)!important;border:1px solid var(--border-accent)!important;color:var(--primary)!important;border-radius:var(--radius-xs)!important;font-weight:700;font-size:.88rem;text-decoration:none!important;transition:all .25s ease}.start-btn:hover{background:var(--math-light)!important;color:#fff!important;border-color:var(--math-light)!important;box-shadow:0 4px 16px var(--accent-glow);transform:translateY(-1px)}.start-btn i{font-size:1rem}.empty-state{text-align:center;padding:60px 20px;color:var(--text-muted)}.empty-state i{font-size:3rem;color:var(--empty-icon-color);margin-bottom:16px;display:block}.empty-state h3{font-weight:700;margin-bottom:8px;color:var(--text-secondary)}.empty-state p{margin-bottom:16px}.pagination-container{margin-top:28px;padding:20px 0;transition:background-color .4s}.pagination-container .pagination{gap:4px}.pagination-container .page-link{align-items:center;justify-content:center;background:var(--page-link-bg);border:1px solid var(--page-link-border);color:var(--text-secondary);border-radius:var(--radius-xs)!important;padding:6px 12px;font-weight:600;font-size:.88rem;transition:all .2s}.pagination-container .page-link:hover{background:var(--accent-bg);border-color:var(--accent);color:var(--accent)}.pagination-container .page-item.active .page-link{background:var(--page-link-active-bg)!important;border-color:var(--page-link-active-border)!important;color:#fff!important;box-shadow:0 2px 8px var(--accent-glow)}.pagination-container .page-item.disabled .page-link{opacity:.4;pointer-events:none}.page-jump-form{display:inline-flex;align-items:center;gap:4px;margin-left:8px;padding:3px 6px}.page-input{width:60px;padding:4px 8px;background:var(--page-input-bg);border:1px solid var(--border);border-radius:var(--radius-xs);color:var(--text-primary);font-size:.85rem;text-align:center;transition:border-color .2s,background-color .4s,color .4s}.page-input:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 2px var(--accent-glow)}.jump-btn{padding:4px 12px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-xs);font-size:.82rem;font-weight:700;cursor:pointer;transition:all .2s}.jump-btn:hover{opacity:.85;transform:translateY(-1px)}.page-info{text-align:center;margin-top:12px;font-size:.82rem;color:var(--text-muted)}#toast-container{z-index:2000}#toast-container .toast{border-radius:var(--radius-sm);backdrop-filter:blur(12px);animation:slideIn .3s ease}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 22px;background:var(--accent);color:white;border:none;border-radius:10px;font-weight:600;cursor:pointer;text-decoration:none;transition:all 0.3s ease;box-shadow:var(--shadow-sm);text-align:center;white-space:nowrap;gap:8px;position:relative;overflow:hidden}.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.2),transparent);transition:left 0.5s ease}.btn:hover::before{left:100%}.site-footer{position:relative;z-index:1;padding:48px 28px 24px;background:#0e1019;border-top:1px solid rgba(255,255,255,0.06);transition:background-color .4s,border-color .4s}[data-theme="light"] .site-footer{background:#151726;border-top-color:rgba(255,255,255,0.05)}.footer-inner{max-width:1200px;margin:0 auto}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px;margin-bottom:36px}.footer-brand .topbar-logo{margin-bottom:4px}.footer-brand p{font-size:.83rem;font-weight:600;color:#8d99b0;line-height:1.5;margin:6px 0 0;max-width:330px}.footer-col h4{font-size:.9rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:#94a3b8;margin:0 0 16px}.footer-col ul{list-style:none;padding:0;margin:0}.footer-col ul li{margin-bottom:8px}.footer-col ul li a{font-size:.86rem;font-weight:700;color:#6b7a90;text-decoration:none;transition:color .2s;display:inline-flex;align-items:center;gap:5px}.footer-col ul li a:hover{color:var(--footer_col_ul_li_a)}.footer-col ul li a i{font-size:.83rem;opacity:.9}[data-theme="light"] .footer-col ul li a{color:#6b7a90}[data-theme="light"] .footer-col ul li a:hover{color:var(--footer_col_ul_li_a)}.footer-bottom{padding-top:22px;border-top:1px solid rgba(255,255,255,0.06);display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:600;color:#5e6b82;gap:12px;flex-wrap:wrap;transition:border-color .4s}.footer-bottom span a{font-size:.8rem;font-weight:700;color:#5e6b82}.footer-socials{display:flex;gap:10px}.footer-socials a{width:34px;height:34px;border-radius:8px;background:rgba(255,255,255,0.05);border:1px solid rgba(255,255,255,0.08);display:flex;align-items:center;justify-content:center;color:#6b7a90;font-size:.9rem;text-decoration:none;transition:all .2s}.footer-socials a:hover{color:var(--accent);border-color:var(--accent);background:var(--accent-bg)}.footer-badge-row{display:flex;align-items:center;gap:12px;margin-top:16px;flex-wrap:wrap}.footer-badge-siteStats{display:flex;align-items:center;font-size:.63rem;gap:6px;margin-top:2px;flex-wrap:wrap}.footer-badge{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:50px;font-size:.7rem;font-weight:600;border:1px solid rgba(255,255,255,0.08);color:#8d99b0;background:rgba(255,255,255,0.04)}.footer-badge-Stats{display:inline-flex;align-items:center;gap:5px;margin:1px;padding:2px 6px;border-radius:50px;font-size:.63rem;font-weight:600;border:1px solid rgba(255,255,255,0.08);color:#8d99b0;background:rgba(255,255,255,0.04)}.footer-badge i{font-size:.72rem}.footer-badge-Stats i{font-size:.6rem}[data-theme="light"] .footer-badge{border-color:rgba(255,255,255,0.06);color:#8d99b0;background:rgba(255,255,255,0.03)}[data-theme="light"] .footer-badge-Stats{border-color:rgba(255,255,255,0.06);color:#8d99b0;background:rgba(255,255,255,0.03)}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:2px}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:rgba(0,0,0,0.05);border-radius:4px}::-webkit-scrollbar-thumb{background:rgba(0,0,0,0.15);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:rgba(0,0,0,0.25)}[data-theme="light"] ::-webkit-scrollbar-track{background:rgba(0,0,0,0.03)}[data-theme="light"] ::-webkit-scrollbar-thumb{background:rgba(0,0,0,0.12)}@media (max-width:2559px){.main-container{max-width:1600px;padding:0 28px}.footer-inner{max-width:1400px}}@media (max-width:1919px){.main-container{max-width:1200px;padding:0 24px}body{font-size:15px}.footer-inner{max-width:1200px}}@media (max-width:1279px){.main-container{max-width:100%;padding:0 20px}body{font-size:14px}.topbar .navbar-nav .nav-link{padding:5px 9px;font-size:.88rem}.footer-grid{grid-template-columns:1.5fr 1fr 1fr;gap:28px}.footer-grid .footer-col:last-child{display:none}.footer-col-contact{display:none}}@media (max-width:1023px){.main-container{max-width:100%;padding:0 16px}body{font-size:13px}.topbar .navbar-nav .nav-link{padding:5px 8px;font-size:.86rem}.topbar .navbar-nav{gap:0}.topbar-logo{font-size:.95rem}.topbar-logo i{font-size:1.05rem}.theme-btn{width:30px;height:30px}.theme-btn svg{width:14px;height:14px}.footer-grid{grid-template-columns:1.5fr 1fr 1fr;gap:24px}.footer-grid .footer-col:last-child{display:none}.simulation-grid{grid-template-columns:repeat(3,1fr);gap:14px}.subject-card{width:88px}.messages{top:calc(var(--topbar-height) + 12px);right:15px;max-width:350px}}@media (max-width:992px){.topbar-nav-toggler{display:flex}.mobile-toggler{display:flex}.topbar .navbar-collapse{position:absolute;top:100%;left:0;right:0;background:var(--topbar-bg);border-bottom:1px solid var(--border);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);padding:12px 16px;box-shadow:0 8px 32px rgba(0,0,0,.3);z-index:999;max-height:calc(100vh - var(--topbar-height) - 20px);overflow-y:auto;height:auto;justify-content:flex-start}.topbar .navbar-collapse .navbar-nav{height:auto;flex-direction:column;gap:0;width:100%}.topbar .navbar-nav .nav-link{width:100%;padding:10px 12px;border-radius:var(--radius-xs);font-size:.85rem}.topbar .dropdown-menu{background:var(--bg-secondary);border:1px solid var(--border);box-shadow:none;backdrop-filter:none;padding:4px 0 4px 12px;margin-top:0!important;animation:none;min-width:0;border-radius:0}.topbar .dropdown-item{padding:8px 12px;font-size:.82rem}.topbar .dropdown-header{padding:10px 12px 4px}.messages{top:calc(var(--topbar-height) + 10px);right:10px;max-width:320px}.simulation-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}.footer-brand p{font-size:.76rem}.footer-col h4{font-size:.83rem}.footer-col ul li a i{font-size:.73rem}.footer-col ul li a{font-size:.76rem}.footer-bottom-donnie,.footer-bottom-icp{font-size:.76rem}.footer-bottom span a{font-size:.76rem}}@media (max-width:767px){:root{--topbar-height:52px}.main-container{max-width:100%;padding:0 12px}body{font-size:12px;line-height:1.5}.topbar{padding:0 14px}.topbar-logo span{display:none}.ambient-glow .orb-1{width:300px;height:300px}.ambient-glow .orb-2{width:250px;height:250px}.ambient-glow .orb-3{width:200px;height:200px}.theme-switcher{padding:2px;gap:2px}.theme-btn{width:28px;height:28px}.theme-btn svg{width:13px;height:13px}.btn{padding:5px 12px;font-size:.8rem;border-radius:8px;gap:5px}.subject-filter-container{padding:12px 14px;margin-bottom:14px}.subject-card{width:78px;padding:8px 6px 6px}.subject-card .card-img-top{height:44px!important;width:60px!important}.subject-name{font-size:.7rem}.simulation-grid{grid-template-columns:repeat(auto-fill,minmax(155px,1fr));gap:10px}.simulation-card .card-body{padding:10px 12px}.simulation-card .card-title{font-size:.95rem!important}.simulation-card .card-text{font-size:.78rem}.simulation-card .card-footer{padding:8px 12px 10px}.start-btn{padding:6px 12px;font-size:.8rem}.search-suggestions{border-radius:var(--radius-xs)}.suggestion-item{padding:8px 12px}.footer-grid{grid-template-rows:2fr;gap:30px;display:flex;align-items:center;justify-content:center}.footer-grid .footer-col:last-child{display:block}.footer-brand{display:none}.footer-col h4{font-size:.82rem}.footer-col ul li a i{font-size:.70rem}.footer-col ul li a{font-size:.73rem}.footer-bottom-donnie{font-size:.73rem}.footer-bottom-icp{display:none}.footer-bottom{flex-direction:column;gap:14px;text-align:center}.footer-bottom span a{font-size:.73rem}.messages{top:calc(var(--topbar-height) + 8px);right:8px;max-width:260px}.alert{padding:8px 12px;font-size:.85rem;border-radius:8px;margin-bottom:10px}.alert i{font-size:.9rem;margin-right:6px}.pagination-container .page-link{padding:4px 8px;font-size:.8rem}.page-jump-form{margin-left:4px;padding:2px 4px}.page-input{width:50px;padding:3px 6px;font-size:.8rem}.jump-btn{padding:3px 8px;font-size:.75rem}}@media (max-width:576px){.topbar-logo span{display:none}.simulation-grid{grid-template-columns:repeat(2,1fr);gap:8px}.subject-card{width:72px}}@media (max-width:359px){:root{--topbar-height:46px;--radius:12px;--radius-sm:9px;--radius-xs:6px}.main-container{padding:0 8px}body{font-size:11px}.topbar{padding:0 10px}.topbar-logo{font-size:.88rem}.topbar-logo i{font-size:.95rem}.theme-btn{width:26px;height:26px}.theme-btn svg{width:12px;height:12px}.btn{padding:4px 10px;font-size:.75rem;border-radius:6px;gap:4px}.simulation-grid{grid-template-columns:1fr;gap:10px}.subject-card{width:66px}.site-footer{padding:28px 14px 18px}.footer-bottom span a{font-size:.63rem}.footer-col h4{font-size:.72rem}.footer-col ul li a i{font-size:.60rem}.footer-col ul li a{font-size:.63rem}.footer-bottom-donnie{font-size:.63rem}}@media (max-height:500px) and (orientation:landscape){:root{--topbar-height:44px}.topbar{padding:0 16px}.topbar::before{height:1px}.topbar-logo{font-size:.88rem}.topbar .navbar-nav .nav-link{padding:4px 8px;font-size:.82rem}.topbar .navbar-nav .nav-link i{font-size:.82rem}.topbar-nav-left{gap:6px}.topbar-nav-right{gap:6px}.ambient-glow{display:none}.topbar .navbar-collapse{max-height:200px}}@media (-webkit-min-device-pixel-ratio:2),(min-resolution:192dpi){body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.topbar{border-bottom-width:.5px}.topbar::before{height:1px}.site-footer{border-top-width:.5px}.ambient-glow .orb{filter:blur(100px)}}@media print{:root{--bg-primary:#fff;--bg-secondary:#fff;--bg-card:#fff;--text-primary:#000;--text-secondary:#333;--text-muted:#666;--border:#ccc;--topbar-bg:#fff;--topbar-border:#ccc}*,*::before,*::after{box-shadow:none!important;text-shadow:none!important;animation:none!important;transition:none!important}body{background:#fff!important;color:#000!important;font-size:12pt}*{print-color-adjust:exact;-webkit-print-color-adjust:exact}#particles-js,.ambient-glow,.theme-switcher,.topbar-nav-toggler,.mobile-toggler,.scroll-btn,.search-bar-container,.pagination-container{display:none!important}.topbar{position:static!important;background:#fff!important;border-bottom:2px solid #000!important;backdrop-filter:none!important;height:auto!important;padding:8px 0!important}.topbar::before{display:none!important}.topbar .navbar-collapse{position:static!important;background:transparent!important;border:none!important;box-shadow:none!important;backdrop-filter:none!important;padding:0!important;max-height:none!important;overflow:visible!important;height:auto!important}.topbar .navbar-nav .nav-link{color:#000!important;font-weight:700}.topbar-logo{color:#000!important}.site-footer{background:#fff!important;border-top:2px solid #000!important}.footer-socials,.footer-badge-row{display:none!important}a{color:#000!important;text-decoration:underline!important}}@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important}}@media (hover:hover){.subject-scroll-content{cursor:grab}.subject-scroll-content:hover .scroll-btn{opacity:.9;visibility:visible}.subject-card:hover{transform:translateY(-4px) scale(1.02);z-index:1}}