@import "https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap";.support-page{max-width:1100px;margin:0 auto;padding:32px 24px 80px;animation:.4s fadeIn}.support-hero{text-align:center;margin-bottom:40px}.support-hero-icon{filter:drop-shadow(0 0 20px #00e5ff66);margin-bottom:12px;font-size:3rem;display:block}.support-hero h1{background:linear-gradient(135deg,#00e5ff,#7c3aed);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:10px;font-size:2.2rem;font-weight:800}.support-hero p{color:var(--text-secondary);max-width:520px;margin:0 auto;font-size:1.05rem}.support-cards{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-bottom:40px;display:grid}.support-card{background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-primary);border-radius:14px;align-items:center;gap:16px;padding:20px;text-decoration:none;transition:all .2s;display:flex}.support-card:hover{border-color:var(--accent-cyan);transform:translateY(-2px);box-shadow:0 8px 24px #00e5ff1f}.support-card.primary{background:linear-gradient(135deg,#00e5ff0f,#7c3aed0f);border-color:#00e5ff4d}.support-card-icon{background:#ffffff0d;border-radius:12px;justify-content:center;align-items:center;min-width:48px;height:48px;font-size:1.8rem;display:flex}.support-card-body h3{margin-bottom:3px;font-size:.95rem;font-weight:700}.support-card-body p{color:var(--accent-cyan);margin-bottom:6px;font-family:JetBrains Mono,monospace;font-size:.83rem}.support-card-badge{color:var(--text-secondary);background:#ffffff12;border-radius:20px;padding:2px 8px;font-size:.72rem}.support-card-badge.green{color:#10b981;background:#10b98126}.support-card-arrow{color:var(--accent-cyan);opacity:.6;margin-left:auto;font-size:1.2rem}.support-grid{grid-template-columns:1fr 1fr;gap:28px;margin-bottom:32px;display:grid}@media (width<=768px){.support-grid{grid-template-columns:1fr}}.support-faq h2,.support-form-wrap h2{color:var(--text-primary);margin-bottom:16px;font-size:1.2rem;font-weight:700}.faq-list{flex-direction:column;gap:8px;display:flex}.faq-item{background:var(--bg-secondary);border:1px solid var(--border-color);cursor:pointer;border-radius:10px;transition:border-color .2s;overflow:hidden}.faq-item.open{border-color:var(--accent-cyan)}.faq-question{justify-content:space-between;align-items:center;gap:12px;padding:14px 16px;font-size:.88rem;font-weight:500;display:flex}.faq-chevron{color:var(--accent-cyan);flex-shrink:0;font-size:.7rem}.faq-answer{color:var(--text-secondary);border-top:1px solid var(--border-color);padding:12px 16px 14px;font-size:.84rem;line-height:1.6;animation:.2s fadeIn}.support-form-wrap{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:14px;padding:24px}.support-form{flex-direction:column;gap:14px;display:flex}.form-row{grid-template-columns:1fr 1fr;gap:12px;display:grid}@media (width<=500px){.form-row{grid-template-columns:1fr}}.support-form .form-group{flex-direction:column;gap:6px;display:flex}.support-form label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em;font-size:.8rem;font-weight:600}.support-form input,.support-form select,.support-form textarea{border:1px solid var(--border-color);color:var(--text-primary);background:#ffffff0a;border-radius:8px;outline:none;padding:10px 12px;font-family:Outfit,sans-serif;font-size:.88rem;transition:border-color .2s}.support-form input:focus,.support-form select:focus,.support-form textarea:focus{border-color:var(--accent-cyan);box-shadow:0 0 0 3px #00e5ff14}.support-form select option{background:#0f1020}.support-form-note{color:var(--text-secondary);text-align:center;opacity:.7;margin-top:4px;font-size:.76rem}.support-success{text-align:center;padding:32px 16px}.support-success-icon{margin-bottom:16px;font-size:3rem}.support-success h3{margin-bottom:8px;font-size:1.2rem;font-weight:700}.support-success p{color:var(--text-secondary);font-size:.9rem}.support-success .btn{margin-top:20px}.support-banner{color:var(--text-secondary);background:linear-gradient(135deg,#00e5ff14,#7c3aed14);border:1px solid #00e5ff33;border-radius:12px;align-items:flex-start;gap:12px;padding:16px 20px;font-size:.87rem;line-height:1.5;display:flex}.support-banner span:first-child{flex-shrink:0;margin-top:2px;font-size:1.2rem}.support-banner a{color:var(--accent-cyan);font-weight:600;text-decoration:none}.support-banner a:hover{text-decoration:underline}:root{--bg-primary:#070810;--bg-secondary:#101220b8;--bg-tertiary:#181c30e0;--bg-card:#101220b8;--bg-input:#ffffff0a;--bg-sidebar:#0a0c16a6;--bg-header:#070810eb;--code-bg:#07080d;--accent-purple:#7c4dff;--accent-purple-glow:#7c4dff61;--accent-cyan:#00e5ff;--accent-cyan-glow:#00e5ff59;--accent-emerald:#00e676;--accent-amber:#ffea00;--accent-rose:#ff1744;--accent-orange:#ff6d00;--text-primary:#f0f2ff;--text-secondary:#9aa0c0;--text-muted:#555a78;--border-glass:#ffffff12;--border-focus:#00e5ff80;--border-card:#ffffff12;--shadow-neon:0 8px 32px #00000073;--overlay-bg:#04050af7;--font-main:"Outfit", -apple-system, sans-serif;--font-code:"JetBrains Mono", monospace;--sidebar-width:260px;--header-height:66px;--radius-lg:16px;--radius-md:12px;--radius-sm:8px;--transition:all .28s 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4px 20px #0f172a12, 0 1px 4px #0f172a0d;--overlay-bg:#f0f4fffa;--ai-root-bg:transparent;--ai-sidebar-bg:#fff;--ai-sidebar-border:#0f172a17;--ai-topbar-bg:#ffffffeb;--ai-topbar-border:#0f172a17;--ai-input-area-bg:#ffffffeb;--ai-bubble-bot-bg:#f8fafc;--ai-bubble-bot-border:#0f172a17;--ai-bubble-user-bg:linear-gradient(135deg, #6d28d921, #4f46e514);--ai-bubble-user-border:#6d28d940;--ai-bubble-user-color:#0f172a;--ai-code-bg:#1e293b;--ai-code-border:#0f172a26;--ai-code-header-bg:#0f172a14;--ai-code-color:#bfdbfe;--ai-input-bg:#0f172a0a;--ai-input-border:#0f172a1f;--ai-chip-bg:#0f172a08;--ai-chip-border:#0f172a17;--ai-model-card-bg:#4f46e50d;--ai-model-card-border:#4f46e52e;--ai-overlay-bg:#0f172a59;--ai-btn-bg:#0f172a0a;--ai-btn-border:#0f172a1a;--ai-action-bg:#0f172a0a;--ai-action-border:#0f172a17;--ai-stat-border:#0f172a17;--ai-stat-bg:#0f172a08;--ai-divider:#0f172a14}[data-theme=light] .background-glow{background:radial-gradient(60% 50% at 15% 10%,#7c3aed0d 0%,#0000 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.btn-accent:hover{filter:brightness(1.08);color:#fff}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-main);background:var(--bg-primary);color:var(--text-primary);height:100vh;transition:background .35s,color .35s;overflow-x:hidden}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#7c4dff40;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--accent-purple)}a{color:inherit;text-decoration:none}.background-glow{z-index:-1;pointer-events:none;background:radial-gradient(60% 50% at 15% 10%,#7c4dff1a 0%,#0000 60%),radial-gradient(50% 50% at 85% 85%,#00e5ff12 0%,#0000 60%),radial-gradient(40% 40%,#00e67608 0%,#0000 70%);position:fixed;inset:0}.app-container{grid-template-columns:var(--sidebar-width) 1fr;grid-template-rows:var(--header-height) 1fr;height:100vh;display:grid}header{background:var(--bg-header);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border-glass);z-index:200;box-shadow:0 1px 0 var(--border-glass);grid-column:1/-1;justify-content:space-between;align-items:center;gap:14px;padding:0 20px;display:flex}.logo{letter-spacing:-.5px;white-space:nowrap;background:linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));-webkit-text-fill-color:transparent;-webkit-background-clip:text;flex-shrink:0;align-items:center;gap:10px;font-size:1.45rem;font-weight:900;display:flex}.header-right{flex-shrink:0;align-items:center;gap:10px;display:flex}.trial-timer-pill{color:var(--accent-amber);white-space:nowrap;background:#ffea0014;border:1px solid #ffea0040;border-radius:50px;align-items:center;gap:7px;padding:5px 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var(--border-glass);border-radius:var(--radius-md);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);z-index:1000;max-height:300px;display:none;position:absolute;top:calc(100% + 8px);left:0;right:0;overflow-y:auto;box-shadow:0 20px 60px #0006}.search-results-dropdown.visible{display:block}.search-result-item{cursor:pointer;transition:var(--transition);border-bottom:1px solid var(--border-glass);align-items:center;gap:12px;padding:11px 16px;display:flex}.search-result-item:last-child{border-bottom:none}.search-result-item:hover{background:var(--accent-purple-glow)}.search-result-title{font-size:.88rem;font-weight:600}.search-result-category{color:var(--text-muted);font-size:.75rem}.progress-pill{background:var(--bg-input);border:1px solid var(--border-glass);color:var(--text-secondary);border-radius:50px;align-items:center;gap:5px;padding:5px 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16px;font-size:.88rem;font-weight:500}.lang-option:hover{background:var(--accent-purple-glow);color:var(--accent-purple)}.lang-option.active{color:var(--accent-cyan)}.theme-toggle-btn{background:var(--bg-input);border:1px solid var(--border-glass);cursor:pointer;transition:var(--transition);color:var(--text-primary);border-radius:50px;padding:6px 12px;font-size:1rem}.theme-toggle-btn:hover{background:#ffffff14}.user-avatar-pill{cursor:pointer;-webkit-user-select:none;user-select:none;background:linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:34px;height:34px;font-size:.88rem;font-weight:800;display:flex;position:relative}.user-dropdown{background:var(--bg-card);border:1px solid var(--border-glass);border-radius:var(--radius-md);z-index:1000;min-width:200px;padding:10px 0;display:none;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 12px 40px #0006}.user-avatar-pill.open .user-dropdown{display:block}.user-info{padding:8px 16px}.user-info strong{font-size:.9rem;display:block}.user-info small{color:var(--text-muted);font-size:.78rem}.user-dd-item{cursor:pointer;transition:var(--transition);color:var(--text-secondary);padding:9px 16px;font-size:.88rem}.user-dd-item:hover{background:var(--accent-purple-glow);color:var(--accent-rose)}aside{background:var(--bg-sidebar);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-right:1px solid var(--border-glass);flex-direction:column;justify-content:space-between;padding:20px 12px;display:flex;overflow-y:auto}.nav-menu{flex-direction:column;gap:3px;display:flex}.nav-section-title{text-transform:uppercase;color:var(--text-muted);letter-spacing:1.2px;margin:12px 8px 5px;font-size:.68rem;font-weight:800}.nav-item{color:var(--text-secondary);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);align-items:center;gap:10px;padding:10px 13px;font-size:.9rem;font-weight:500;display:flex}.nav-item:hover{color:var(--text-primary);background:#7c4dff0f}.nav-item.active{color:var(--text-primary);background:linear-gradient(135deg,#7c4dff33,#00e5ff0d);border:1px solid #7c4dff47;box-shadow:0 4px 16px #7c4dff1a}.nav-item svg{stroke:currentColor;flex-shrink:0;width:17px;height:17px}.difficulty-filter{flex-wrap:wrap;gap:6px;padding:0 4px;display:flex}.diff-chip{cursor:pointer;transition:var(--transition);border:1px solid var(--border-glass);color:var(--text-muted);border-radius:50px;padding:4px 10px;font-size:.73rem;font-weight:600}.diff-chip.all.active{background:var(--bg-input);color:var(--text-primary)}.diff-chip.beginner.active{color:var(--accent-emerald);background:#00e6761a;border-color:#00e6764d}.diff-chip.intermediate.active{color:var(--accent-amber);background:#ffea001a;border-color:#ffea004d}.diff-chip.advanced.active{color:var(--accent-rose);background:#ff17441a;border-color:#ff17444d}.sidebar-footer{border-top:1px solid var(--border-glass);flex-direction:column;gap:8px;padding:14px 4px;display:flex}.stats-mini{color:var(--text-muted);text-align:center;font-size:.8rem}.stats-mini span{color:var(--accent-cyan);font-weight:700}main{background:var(--bg-primary);padding:22px;overflow-y:auto}.tab-pane{animation:.3s ease-out forwards fadeIn;display:none}.tab-pane.active{gap:20px;display:grid}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.card{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-neon);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);padding:24px;transition:background .3s,border-color .3s}.card:hover{border-color:#7c4dff2e}.btn{font-family:var(--font-main);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);color:var(--text-primary);border:1px solid #0000;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:.92rem;font-weight:600;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--accent-purple), #9063ff);box-shadow:0 4px 14px var(--accent-purple-glow)}.btn-primary:hover{filter:brightness(1.1);transform:translateY(-2px)}.btn-secondary{background:var(--bg-input);border-color:var(--border-glass)}.btn-secondary:hover{background:#ffffff14}[data-theme=light] .btn-secondary{color:var(--text-primary);background:#0000000a;border-color:#0000001a}.btn-accent{background:linear-gradient(135deg, var(--accent-cyan), #00b0ff);color:#05060e;box-shadow:0 4px 14px var(--accent-cyan-glow)}.btn-accent:hover{filter:brightness(1.08);transform:translateY(-2px)}.btn-icon{border-radius:50%;width:40px;height:40px;padding:0}.btn:disabled{opacity:.38;cursor:not-allowed;transform:none!important}.section-header{justify-content:space-between;align-items:center;display:flex}.section-header h2{font-size:1.3rem;font-weight:700}.grid-3col{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;display:grid}.welcome-hero{background:linear-gradient(135deg,#7c4dff24 0%,#00e5ff0d 60%);border:1px solid #7c4dff38;grid-column:1/-1;position:relative;overflow:hidden}[data-theme=light] .welcome-hero{background:linear-gradient(135deg,#6b3de812 0%,#0097b20a 100%)}.welcome-hero:before{content:"";pointer-events:none;background:radial-gradient(circle,#7c4dff1a 0%,#0000 70%);border-radius:50%;width:340px;height:340px;position:absolute;top:-60%;right:-10%}.hero-badge{color:var(--accent-emerald);letter-spacing:.4px;background:#00e6761a;border:1px solid #00e67647;border-radius:50px;align-items:center;gap:6px;margin-bottom:14px;padding:4px 12px;font-size:.78rem;font-weight:700;display:inline-flex}.welcome-hero h1{margin-bottom:10px;font-size:2.4rem;font-weight:900;line-height:1.15}.gradient-text{background:linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));-webkit-text-fill-color:transparent;-webkit-background-clip:text}.welcome-hero p{color:var(--text-secondary);max-width:560px;margin-bottom:22px;font-size:1.02rem;line-height:1.6}.hero-stats{border-top:1px solid var(--border-glass);flex-wrap:wrap;gap:22px;margin-top:28px;padding-top:20px;display:flex}.hero-stat{flex-direction:column;gap:2px;display:flex}.hero-stat span{color:var(--accent-cyan);font-size:1.75rem;font-weight:800}.hero-stat small{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;font-size:.72rem}.topic-card{cursor:pointer;transition:var(--transition);flex-direction:column;gap:10px;padding:20px;display:flex}.topic-card:hover{border-color:#7c4dff59;transform:translateY(-3px);box-shadow:0 14px 40px #00000059}.topic-card-top{justify-content:space-between;align-items:flex-start;display:flex}.topic-icon{border-radius:10px;justify-content:center;align-items:center;width:42px;height:42px;font-size:1.15rem;display:flex}.topic-icon.purple{background:#7c4dff1f;border:1px solid #7c4dff38}.topic-icon.cyan{background:#00e5ff1a;border:1px solid #00e5ff38}.topic-icon.emerald{background:#00e6761a;border:1px solid #00e67638}.topic-icon.amber{background:#ffea0014;border:1px solid #ffea002e}.diff-badge{letter-spacing:.4px;border-radius:50px;padding:3px 9px;font-size:.7rem;font-weight:700}.diff-badge.Beginner{color:var(--accent-emerald);background:#00e6761a;border:1px solid #00e67640}.diff-badge.Intermediate{color:var(--accent-amber);background:#ffea001a;border:1px solid #ffea0033}.diff-badge.Advanced{color:var(--accent-rose);background:#ff17441a;border:1px solid #ff174433}.topic-title{margin-top:4px;font-size:1rem;font-weight:700}.topic-summary{color:var(--text-secondary);flex-grow:1;font-size:.82rem;line-height:1.45}.topic-meta{color:var(--text-muted);justify-content:space-between;align-items:center;margin-top:4px;font-size:.78rem;display:flex}.topic-completed{color:var(--accent-emerald);font-weight:600}.roadmap-header{margin-bottom:8px}.roadmap-header h2{font-size:1.5rem;font-weight:800}.roadmap-flow{flex-direction:column;padding:0 16px;display:flex}.roadmap-phase-label{text-transform:uppercase;letter-spacing:1.5px;color:var(--text-muted);margin:20px 0 10px 48px;font-size:.7rem;font-weight:800}.roadmap-nodes-row{flex-wrap:wrap;gap:10px;margin-bottom:4px;padding-left:48px;display:flex;position:relative}.roadmap-nodes-row:before{content:"";background:linear-gradient(#7c4dff66,#00e5ff33);width:2px;position:absolute;top:0;bottom:-26px;left:20px}.roadmap-phase:last-child .roadmap-nodes-row:before{bottom:0}.roadmap-node{background:var(--bg-card);border:1px solid var(--border-glass);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);align-items:center;gap:9px;min-width:155px;max-width:215px;padding:11px 15px;font-size:.86rem;font-weight:600;display:flex}.roadmap-node:hover{background:#7c4dff14;border-color:#7c4dff6b;transform:translate(4px)}.roadmap-node.completed{border-color:#00e67661}.roadmap-node-dot{background:var(--border-glass);width:8px;height:8px;transition:var(--transition);border:2px solid #fff3;border-radius:50%;flex-shrink:0}.roadmap-node.completed .roadmap-node-dot{background:var(--accent-emerald);box-shadow:0 0 8px var(--accent-emerald);border-color:var(--accent-emerald)}.learning-layout{height:calc(100vh - var(--header-height) - 44px);grid-template-columns:285px 1fr;gap:20px;display:grid}.curriculum-list{flex-direction:column;gap:7px;padding-right:4px;display:flex;overflow-y:auto}.curriculum-node{border:1px solid var(--border-glass);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);background:var(--bg-card);padding:12px 15px}.curriculum-node:hover{border-color:#7c4dff40}.curriculum-node.active{background:linear-gradient(135deg,#7c4dff26,#7c4dff08);border-color:#7c4dff6b}.curriculum-node.completed{border-left:3px solid var(--accent-emerald)}.curriculum-node-title{margin-bottom:5px;font-size:.88rem;font-weight:700}.curriculum-node-meta{color:var(--text-muted);justify-content:space-between;font-size:.72rem;display:flex}.learning-content-viewer{flex-direction:column;gap:16px;padding-right:6px;display:flex;overflow-y:auto}.learning-content-viewer h1{font-size:1.85rem;font-weight:800}.learning-content-viewer h2{color:var(--text-primary);margin:16px 0 7px;font-size:1.25rem;font-weight:700}.learning-content-viewer h3{color:var(--text-secondary);margin:12px 0 5px;font-size:1.02rem;font-weight:700}.learning-content-viewer p{color:var(--text-secondary);margin-bottom:8px;line-height:1.65}.learning-content-viewer ul,.learning-content-viewer ol{color:var(--text-secondary);padding-left:20px;line-height:1.7}.learning-content-viewer li{margin-bottom:3px}.learning-content-viewer strong{color:var(--text-primary)}.learning-content-viewer code{color:var(--accent-cyan);font-size:.88em;font-family:var(--font-code);background:#7c4dff1f;border-radius:4px;padding:1px 5px}.complexity-table{border-collapse:collapse;width:100%;margin:12px 0;font-size:.86rem}.complexity-table th,.complexity-table td{text-align:left;border-bottom:1px solid var(--border-glass);padding:10px 14px}.complexity-table th{background:var(--bg-input);color:var(--text-secondary);font-weight:600}.complexity-badge{font-family:var(--font-code);border-radius:4px;padding:3px 8px;font-size:.78rem;font-weight:600;display:inline-block}.complexity-green{color:var(--accent-emerald);background:#00e6761a;border:1px solid #00e67633}.complexity-yellow{color:var(--accent-amber);background:#ffea001a;border:1px solid #ffea0033}.complexity-red{color:var(--accent-rose);background:#ff17441a;border:1px solid #ff174433}code,pre{font-family:var(--font-code)}pre{background:var(--code-bg);border:1px solid var(--border-glass);border-radius:0 0 var(--radius-md) var(--radius-md);color:#d8deff;padding:16px;font-size:.875rem;line-height:1.55;overflow-x:auto}.code-tabs-header{border:1px solid var(--border-glass);border-radius:var(--radius-sm) var(--radius-sm) 0 0;background:#00000040;border-bottom:none;gap:2px;margin-top:16px;padding:4px 8px 0;display:flex}[data-theme=light] .code-tabs-header{background:#00000014}.code-tab-btn{color:var(--text-secondary);font-family:var(--font-main);cursor:pointer;transition:var(--transition);background:0 0;border:none;border-radius:4px 4px 0 0;padding:7px 14px;font-size:.82rem;font-weight:600}.code-tab-btn:hover{color:var(--text-primary)}.code-tab-btn.active{color:var(--accent-cyan);background:var(--code-bg);border-bottom:2px solid var(--accent-cyan)}.lesson-actions{border-top:1px solid var(--border-glass);justify-content:space-between;align-items:center;margin-top:6px;padding-top:18px;display:flex}#platforms-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px;display:grid}.platform-card{background:var(--bg-card);border:1px solid var(--border-glass);border-radius:var(--radius-lg);transition:var(--transition);padding:24px;position:relative;overflow:hidden}.platform-card:hover{transform:translateY(-3px)}.platform-card:before{content:"";height:3px;position:absolute;top:0;left:0;right:0}.platform-card.lc:before{background:linear-gradient(90deg,#ff8f00,#ff6d00)}.platform-card.hr:before{background:linear-gradient(90deg,#00c7c7,#00a3a3)}.platform-card.cf:before{background:linear-gradient(90deg,#1565c0,#0d47a1)}.platform-card.cc:before{background:linear-gradient(90deg,sienna,#8b3a1a)}.platform-card.gfg:before{background:linear-gradient(90deg,#2e7d32,#1b5e20)}.platform-logo{margin-bottom:10px;font-size:2rem}.platform-name{margin-bottom:4px;font-size:1.1rem;font-weight:800}.platform-tagline{color:var(--text-muted);margin-bottom:14px;font-size:.82rem}.platform-tips{flex-direction:column;gap:8px;list-style:none;display:flex}.platform-tip{color:var(--text-secondary);gap:8px;font-size:.84rem;line-height:1.5;display:flex}.platform-tip:before{content:"→";color:var(--accent-purple);flex-shrink:0;font-weight:700}.platform-link{cursor:pointer;transition:var(--transition);border:1px solid var(--border-glass);color:var(--text-secondary);border-radius:50px;align-items:center;gap:6px;margin-top:16px;padding:7px 14px;font-size:.82rem;font-weight:700;text-decoration:none;display:inline-flex}.platform-link:hover{color:var(--accent-purple);border-color:#7c4dff66}.quiz-container{max-width:680px;margin:30px auto}.quiz-result-header{color:var(--accent-cyan);text-align:center;margin-bottom:10px;font-size:1.9rem;font-weight:900}.quiz-progress{color:var(--text-muted);margin-bottom:10px;font-size:.82rem}.quiz-progress-bar{background:var(--border-glass);border-radius:2px;height:4px;margin-bottom:20px;overflow:hidden}.quiz-progress-fill{background:linear-gradient(90deg, var(--accent-purple), var(--accent-cyan));border-radius:2px;height:100%;transition:width .4s}.quiz-question{margin-bottom:18px;font-size:1.15rem;font-weight:600;line-height:1.45}.quiz-options{flex-direction:column;gap:10px;display:flex}.quiz-option{border:1px solid var(--border-glass);border-radius:var(--radius-md);background:var(--bg-input);cursor:pointer;transition:var(--transition);align-items:center;gap:12px;padding:14px 17px;display:flex}.quiz-option:hover{background:#7c4dff0f;border-color:#7c4dff4d}.quiz-option.selected{border-color:var(--accent-purple);background:#7c4dff17}.quiz-option.correct{border-color:var(--accent-emerald)!important;background:#00e67612!important}.quiz-option.wrong{border-color:var(--accent-rose)!important;background:#ff174412!important}.quiz-option-letter{background:#ffffff0d;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:.82rem;font-weight:700;display:inline-flex}.quiz-option.selected .quiz-option-letter{background:var(--accent-purple)}.quiz-explanation{border-radius:var(--radius-md);color:var(--text-secondary);background:#00e5ff0a;border:1px solid #00e5ff26;margin-top:16px;padding:13px 15px;font-size:.88rem;line-height:1.5;animation:.3s ease-out fadeIn}.quiz-explanation strong{color:var(--accent-cyan)}.quiz-score-circle{border:6px solid var(--border-glass);border-top-color:var(--accent-purple);border-radius:50%;flex-direction:column;justify-content:center;align-items:center;width:150px;height:150px;margin:22px auto;display:flex}.quiz-score-val{font-size:2.6rem;font-weight:900}.quiz-score-max{color:var(--text-muted);font-size:.82rem}.quiz-card{text-align:left;margin-bottom:14px}.visualizer-workspace{height:calc(100vh - var(--header-height) - 44px);grid-template-columns:1fr 310px;gap:20px;display:grid}.canvas-container{flex-direction:column;height:100%;display:flex}.canvas-header{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.canvas-header h2{font-size:1.2rem;font-weight:700}.algorithm-selector{background:var(--bg-card);border:1px solid var(--border-glass);color:var(--text-primary);font-family:var(--font-main);border-radius:var(--radius-sm);cursor:pointer;outline:none;padding:7px 13px;font-size:.88rem;font-weight:600}.algorithm-selector:focus{border-color:var(--accent-cyan)}.visualization-viewport{background:var(--code-bg);border:1px solid var(--border-glass);border-radius:var(--radius-lg);flex-grow:1;justify-content:center;align-items:flex-end;padding:40px 20px;display:flex;position:relative;overflow:hidden}.array-container{justify-content:center;align-items:flex-end;gap:4px;width:100%;height:100%;display:flex}.array-bar{background:linear-gradient(180deg, var(--accent-purple), #7c4dff66);border-radius:4px 4px 0 0;justify-content:center;align-items:flex-end;transition:height .18s;display:flex;position:relative}.array-bar-value{color:#fff9;font-size:.7rem;font-weight:700;font-family:var(--font-code);position:absolute;bottom:-20px}.array-bar.compare{background:linear-gradient(180deg, var(--accent-cyan), #00e5ff66);box-shadow:0 0 12px var(--accent-cyan-glow)}.array-bar.swap{background:linear-gradient(180deg, var(--accent-rose), #ff174466)}.array-bar.sorted{background:linear-gradient(180deg, var(--accent-emerald), #00e67666)}.array-bar.pivot{background:linear-gradient(180deg, var(--accent-amber), #ffea0066)}.controls-card{flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;margin-top:12px;display:flex}.speed-control{color:var(--text-secondary);align-items:center;gap:7px;font-size:.8rem;display:flex}.speed-control input[type=range]{-webkit-appearance:none;background:var(--border-glass);border-radius:2px;outline:none;width:85px;height:4px}.speed-control input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--accent-purple);cursor:pointer;border-radius:50%;width:13px;height:13px}.visualizer-sidebar{flex-direction:column;gap:16px;height:100%;display:flex;overflow-y:auto}.pseudocode-line{font-family:var(--font-code);color:var(--text-secondary);white-space:pre;border-left:2px solid #0000;border-radius:4px;padding:4px 8px;font-size:.78rem}.pseudocode-line.active{color:var(--text-primary);border-left-color:var(--accent-purple);background:#7c4dff1f}.linear-container{flex-wrap:wrap;justify-content:center;align-items:center;gap:18px;width:100%;height:100%;padding:40px;display:flex}.node-wrapper{align-items:center;animation:.3s ease-out scaleIn;display:flex;position:relative}@keyframes scaleIn{0%{opacity:0;transform:scale(.7)}to{opacity:1;transform:scale(1)}}.struct-node{background:var(--bg-tertiary);border:2px solid var(--accent-purple);width:48px;height:48px;font-weight:700;font-family:var(--font-code);border-radius:50%;justify-content:center;align-items:center;transition:all .25s;display:flex;position:relative;box-shadow:0 4px 12px #0000004d}.struct-node.active{border-color:var(--accent-cyan);box-shadow:0 0 16px var(--accent-cyan-glow);transform:scale(1.1)}.struct-node.success{border-color:var(--accent-emerald);background:#00e6761a}.struct-node.highlight{border-color:var(--accent-amber);transform:scale(1.15)}.struct-node-pointer{color:var(--text-muted);white-space:nowrap;font-size:.65rem;font-weight:600;position:absolute;bottom:-18px}.struct-arrow{background:var(--text-muted);width:26px;height:2px;margin:0 3px;position:relative}.struct-arrow:after{content:"";border-top:5px solid #0000;border-bottom:5px solid #0000;border-left:6px solid var(--text-muted);width:0;height:0;position:absolute;top:-4px;right:0}.struct-arrow.active{background:var(--accent-cyan)}.struct-arrow.active:after{border-left-color:var(--accent-cyan)}.tree-svg-container{pointer-events:none;z-index:1;width:100%;height:100%;position:absolute;top:0;left:0}.tree-nodes-container{z-index:2;width:100%;height:100%;position:absolute;top:0;left:0}.node-container{flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute}.input-group{gap:8px;margin-bottom:10px;display:flex}.text-input{background:var(--bg-input);border:1px solid var(--border-glass);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-main);outline:none;flex-grow:1;padding:8px 12px;font-size:.88rem}.text-input:focus{border-color:var(--border-focus)}.badge-group{flex-wrap:wrap;gap:7px;display:flex}.info-badge{background:var(--bg-input);border:1px solid var(--border-glass);color:var(--text-secondary);border-radius:4px;padding:4px 10px;font-size:.78rem}.info-badge strong{color:var(--text-primary)}.overlay-fullscreen{z-index:2000;background:var(--overlay-bg);justify-content:center;align-items:center;padding:24px;display:flex;position:fixed;inset:0;overflow-y:auto}.auth-glow-bg{pointer-events:none;z-index:-1;background:radial-gradient(60% 50% at 20% 20%,#7c4dff26 0%,#0000 60%),radial-gradient(50% 50% at 80% 80%,#00e5ff1a 0%,#0000 60%);position:fixed;inset:0}.auth-page-container{z-index:2000;background:var(--bg-primary);font-family:var(--font-main);grid-template-columns:1.15fr 1fr;min-height:100vh;display:grid;position:fixed;inset:0;overflow-y:auto}.auth-brand{letter-spacing:-.5px;background:linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;align-items:center;gap:10px;font-size:1.6rem;font-weight:900;display:flex}.auth-side-promo{border-right:1px solid var(--border-glass);background:radial-gradient(circle at 0 0,#7c4dff1f 0%,#0000 50%),radial-gradient(circle at 100% 100%,#00e5ff14 0%,#0000 50%),#0708104d;flex-direction:column;justify-content:space-between;padding:56px;display:flex;position:relative;overflow:hidden}.promo-grid-lines{pointer-events:none;background-image:linear-gradient(var(--border-glass) 1px, transparent 1px), linear-gradient(90deg, var(--border-glass) 1px, transparent 1px);opacity:.45;background-size:40px 40px;position:absolute;inset:0;-webkit-mask-image:radial-gradient(circle at 20% 30%,#000,#0000 70%);mask-image:radial-gradient(circle at 20% 30%,#000,#0000 70%)}.promo-glow-spot{background:var(--accent-purple);filter:blur(140px);opacity:.15;pointer-events:none;border-radius:50%;width:250px;height:250px;position:absolute;top:20%;left:10%}.promo-header{z-index:2;justify-content:space-between;align-items:center;display:flex;position:relative}.promo-edition-badge{text-transform:uppercase;letter-spacing:.05em;background:var(--bg-input);border:1px solid var(--border-glass);color:var(--accent-cyan);border-radius:50px;padding:4px 10px;font-size:.72rem;font-weight:700}.promo-main{z-index:2;margin:auto 0;position:relative}.promo-headline{color:var(--text-primary);letter-spacing:-.02em;margin-bottom:16px;font-size:2.8rem;font-weight:900;line-height:1.15}.promo-subtext{color:var(--text-secondary);max-width:520px;margin-bottom:32px;font-size:1.05rem;line-height:1.6}.promo-stats{grid-template-columns:repeat(3,1fr);gap:16px;max-width:480px;margin-bottom:40px;display:grid}.promo-stat-card{border:1px solid var(--border-glass);border-radius:var(--radius-md);transition:var(--transition);background:#ffffff05;flex-direction:column;gap:4px;padding:16px;display:flex}.promo-stat-card:hover{background:#ffffff0a;border-color:#7c4dff33;transform:translateY(-2px)}.stat-value{color:var(--accent-cyan);font-size:1.8rem;font-weight:800;line-height:1}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em;font-size:.75rem;font-weight:600}.promo-features-list{flex-direction:column;gap:16px;max-width:520px;display:flex}.promo-feature-card{border-radius:var(--radius-md);transition:var(--transition);background:#ffffff03;border:1px solid #0000;gap:16px;padding:16px;display:flex}.promo-feature-card:hover{border-color:var(--border-glass);background:#ffffff05}.feature-icon{background:var(--bg-input);border:1px solid var(--border-glass);border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:42px;height:42px;font-size:1.5rem;display:flex}.feature-card-body h4{color:var(--text-primary);margin:0 0 4px;font-size:.95rem;font-weight:700}.feature-card-body p{color:var(--text-secondary);margin:0;font-size:.82rem;line-height:1.45}.promo-footer{color:var(--text-muted);z-index:2;font-size:.82rem;position:relative}.auth-side-form{justify-content:center;align-items:center;padding:40px;display:flex;position:relative}.auth-card{-webkit-backdrop-filter:blur(24px);background:#10122059;border:1px solid #ffffff14;border-radius:24px;width:100%;max-width:440px;padding:40px;animation:.5s cubic-bezier(.16,1,.3,1) forwards authFadeIn;position:relative;box-shadow:0 30px 80px #00000073}@keyframes authFadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}[data-theme=light] .auth-card{background:#ffffff80;border:1px solid #0000000f;box-shadow:0 20px 50px #0000000f}.auth-brand-mobile{text-align:center;flex-direction:column;align-items:center;margin-bottom:24px;display:none}.auth-brand-mobile .auth-brand{margin-bottom:6px}.auth-brand-mobile .auth-subtitle{margin:0}.trial-promo-badge{border-radius:var(--radius-md);color:var(--accent-emerald);background:linear-gradient(135deg,#00e6761a,#00e5ff0d);border:1px solid #00e67647;justify-content:center;align-items:center;gap:8px;margin-bottom:24px;padding:11px 16px;font-size:.85rem;display:flex;box-shadow:0 4px 12px #00e6760d}.trial-badge-dot{background-color:var(--accent-emerald);width:7px;height:7px;box-shadow:0 0 8px var(--accent-emerald);border-radius:50%;animation:1.8s infinite pulseEmerald}@keyframes pulseEmerald{0%{transform:scale(.95);box-shadow:0 0 #00e676b3}70%{transform:scale(1);box-shadow:0 0 0 6px #00e67600}to{transform:scale(.95);box-shadow:0 0 #00e67600}}.auth-tabs-pill{background:var(--bg-input);border:1px solid var(--border-glass);border-radius:12px;gap:4px;margin-bottom:28px;padding:4px;display:flex;position:relative}.auth-tab-pill-btn{font-family:var(--font-main);cursor:pointer;color:var(--text-secondary);transition:var(--transition);background:0 0;border:none;border-radius:8px;flex:1;padding:10px 16px;font-size:.88rem;font-weight:700}.auth-tab-pill-btn:hover{color:var(--text-primary)}.auth-tab-pill-btn.active{background:var(--bg-primary);color:var(--text-primary);border:1px solid var(--border-glass);box-shadow:0 4px 12px #00000026}[data-theme=light] .auth-tab-pill-btn.active{background:#fff;box-shadow:0 4px 10px #0000000d}.auth-form{flex-direction:column;gap:16px;display:flex}.auth-form-title{color:var(--text-primary);letter-spacing:-.01em;margin:0 0 6px;font-size:1.35rem;font-weight:800}.auth-form-desc{color:var(--text-secondary);margin:0 0 16px;font-size:.85rem;line-height:1.5}.form-group{flex-direction:column;gap:6px;display:flex}.form-group 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.ai-input-wrapper:focus-within{border-color:#4f46e566;box-shadow:0 0 0 3px #4f46e514,0 4px 20px #4f46e50f}[data-theme=light] .ai-input-textarea{color:var(--text-primary)}[data-theme=light] .ai-input-textarea::placeholder,[data-theme=light] .ai-input-char-count{color:var(--text-muted)}[data-theme=light] .ai-input-footer{color:#0f172a4d}[data-theme=light] .ai-chat-messages::-webkit-scrollbar-thumb{background:#0f172a1f}[data-theme=light] .aipage-sidebar::-webkit-scrollbar-thumb{background:#0f172a1a}[data-theme=light] .aipage-sidebar--open{box-shadow:4px 0 30px #0f172a1f}.admin-login-wrapper{background:var(--bg-dark);justify-content:center;align-items:center;height:100vh;display:flex}.admin-login-card{border:1px solid var(--border-glass);text-align:center;background:#141828cc;border-radius:16px;width:100%;max-width:400px;padding:40px;box-shadow:0 10px 40px #00000080}.admin-lock-icon{margin-bottom:20px;font-size:3rem}.admin-input{border:1px solid var(--border-glass);color:#fff;background:#0000004d;border-radius:8px;outline:none;width:100%;margin:15px 0;padding:12px}.admin-input:focus{border-color:var(--accent-cyan)}.admin-btn,.admin-btn-primary{background:var(--accent-cyan);color:#000;cursor:pointer;border:none;border-radius:8px;width:100%;padding:12px;font-weight:700;transition:opacity .2s}.admin-btn:hover,.admin-btn-primary:hover{opacity:.9}.admin-error{color:#ff4d4d;margin-bottom:15px;font-size:.85rem}.admin-dashboard{background:var(--bg-dark);color:#fff;height:100vh;display:flex}.admin-sidebar{border-right:1px solid var(--border-glass);background:#101423e6;flex-direction:column;width:250px;display:flex}.admin-brand{border-bottom:1px solid var(--border-glass);align-items:center;gap:10px;padding:20px;font-size:1.2rem;font-weight:700;display:flex}.admin-badge{background:var(--accent-purple);vertical-align:middle;border-radius:4px;padding:2px 6px;font-size:.65rem}.admin-nav{flex-direction:column;flex:1;gap:5px;padding:20px 10px;display:flex}.admin-nav button{color:var(--text-secondary);text-align:left;cursor:pointer;background:0 0;border:none;border-radius:8px;padding:12px 15px;font-size:.95rem;transition:all .2s}.admin-nav button:hover,.admin-nav button.active{color:var(--accent-cyan);background:#00e5ff1a}.admin-footer{border-top:1px solid var(--border-glass);padding:20px}.admin-logout-btn{border:1px solid var(--border-glass);width:100%;color:var(--text-secondary);cursor:pointer;background:0 0;border-radius:8px;padding:10px}.admin-logout-btn:hover{color:#fff;background:#ffffff0d}.admin-content{flex-direction:column;flex:1;display:flex;overflow:hidden}.admin-header{border-bottom:1px solid var(--border-glass);justify-content:space-between;align-items:center;padding:20px 30px;display:flex}.admin-header h1{margin:0;font-size:1.5rem}.admin-action-toast{background:var(--accent-purple);border-radius:20px;padding:8px 16px;font-size:.85rem;animation:.3s fadeIn}.admin-main{flex:1;padding:30px;overflow-y:auto}.admin-stat-cards{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-bottom:30px;display:grid}.admin-stat-card{border:1px solid var(--border-glass);background:#ffffff08;border-radius:12px;padding:20px}.admin-stat-card.premium{border-top:3px solid var(--accent-purple)}.admin-stat-card.revenue{border-top:3px solid var(--accent-green)}.admin-stat-card.warning{border-top:3px solid #ffca28}.stat-label{color:var(--text-secondary);margin-bottom:10px;font-size:.9rem}.stat-value{font-size:2rem;font-weight:700}.admin-info-panel{background:#00e5ff0d;border:1px solid #00e5ff33;border-radius:12px;padding:20px}.admin-table-container{border:1px solid var(--border-glass);background:#ffffff05;border-radius:12px;overflow:hidden}.admin-table{border-collapse:collapse;width:100%}.admin-table th,.admin-table td{text-align:left;border-bottom:1px solid var(--border-glass);padding:15px 20px}.admin-table th{color:var(--text-secondary);text-transform:uppercase;background:#0003;font-size:.85rem;font-weight:600}.status-badge{border-radius:20px;padding:4px 10px;font-size:.75rem;font-weight:700}.status-badge.paid{color:#00ff80;background:#00ff801a;border:1px solid #00ff804d}.status-badge.free{color:var(--text-secondary);background:#ffffff1a}.admin-btn-small{color:var(--accent-purple);cursor:pointer;background:#7c4dff1a;border:1px solid #7c4dff4d;border-radius:6px;padding:6px 12px;font-size:.8rem;transition:all .2s}.admin-btn-small:hover{background:var(--accent-purple);color:#fff}.admin-broadcast{max-width:740px}.broadcast-card{border:1px solid var(--border-glass);background:#ffffff08;border-radius:12px;padding:30px}.broadcast-desc{color:var(--text-secondary);margin-bottom:20px;font-size:.9rem}.form-group{margin-bottom:20px}.form-group label{color:var(--text-secondary);margin-bottom:8px;font-size:.9rem;display:block}.admin-input[type=text],.admin-input[type=password],.admin-input[type=email],select.admin-input{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-position:right 12px center;background-repeat:no-repeat}select.admin-input option{color:#f1f5f9;background:#1e293b}.admin-textarea{border:1px solid var(--border-glass);color:#fff;resize:vertical;background:#0000004d;border-radius:8px;outline:none;width:100%;padding:12px;font-family:monospace}.admin-textarea:focus{border-color:var(--accent-cyan)}.admin-ai-chat{border:1px solid var(--border-glass);background:#ffffff05;border-radius:12px;flex-direction:column;height:100%;display:flex;overflow:hidden}.chat-window{flex-direction:column;flex:1;gap:15px;padding:20px;display:flex;overflow-y:auto}.chat-bubble{gap:15px;max-width:80%;display:flex}.chat-bubble.ai{align-self:flex-start}.chat-bubble.admin{flex-direction:row-reverse;align-self:flex-end}.chat-avatar{background:#0000004d;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;font-size:1.2rem;display:flex}.chat-content{background:#ffffff0d;border-radius:12px;padding:15px;font-size:.95rem;line-height:1.5}.chat-bubble.admin .chat-content{background:#00e5ff1a;border:1px solid #00e5ff33}.chat-bubble.thinking .chat-content{color:var(--text-secondary);font-style:italic}.chat-input-area{border-top:1px solid var(--border-glass);background:#0003;gap:10px;padding:20px;display:flex}.chat-input-area .admin-input{flex:1;margin:0}.chat-input-area button{width:100px}