@import "https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;600;700;800&display=swap";
@import "https://cdn.jsdelivr.net/npm/katex@0.16.21/dist/katex.min.css";
:root{--bg-primary:#0a0e1a;--bg-secondary:#111827;--bg-card:#111827cc;--bg-card-hover:#1f2937e6;--bg-glass:#a855f714;--accent-primary:#a855f7;--accent-secondary:#22d3ee;--accent-glow:#a855f766;--success:#10b981;--warning:#facc15;--stellar-gold:#facc15;--error:#ef4444;--text-primary:#f9fafb;--text-secondary:#9ca3af;--text-muted:#6b7280;--border:#a855f733;--border-subtle:#ffffff0f;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--shadow-glow:0 0 20px #a855f726;--sidebar-width:240px;--transition:.2s cubic-bezier(.4,0,.2,1)}[data-theme=light]{--bg-primary:#f5f7fb;--bg-secondary:#fff;--bg-card:#ffffffe6;--bg-card-hover:#f3f4f6f2;--bg-glass:#8b5cf60f;--bg-elevated:#f0f1f5;--accent-primary:#7c3aed;--accent-secondary:#0891b2;--accent-glow:#7c3aed40;--success:#059669;--warning:#d97706;--error:#dc2626;--text-primary:#111827;--text-secondary:#4b5563;--text-muted:#9ca3af;--text-main:#111827;--border:#7c3aed2e;--border-subtle:#00000014;--shadow-glow:0 0 16px #7c3aed1a}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px}body{background:var(--bg-primary);color:var(--text-primary);min-height:100vh;font-family:Noto Sans KR,system-ui,-apple-system,sans-serif;line-height:1.6;transition:background .3s,color .3s;overflow-x:hidden}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit;background:0 0;border:none;font-family:inherit}input,select,textarea{color:inherit;background:0 0;border:none;outline:none;font-family:inherit}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:3px}.app-layout{min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border-subtle);z-index:100;transition:transform var(--transition);flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0}.sidebar-logo{border-bottom:1px solid var(--border-subtle);align-items:center;gap:12px;padding:24px 20px;display:flex}.sidebar-logo .logo-icon{background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));border-radius:var(--radius-sm);justify-content:center;align-items:center;width:36px;height:36px;font-size:18px;display:flex}.sidebar-logo h1{background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:16px;font-weight:700}.sidebar-profile{border-bottom:1px solid var(--border-subtle);background:linear-gradient(#a855f708 0%,#0000 100%);align-items:center;gap:12px;padding:24px 20px;display:flex}.sidebar-avatar{background:linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));border-radius:var(--radius-md);flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;font-size:20px;animation:3s ease-in-out infinite avatar-pulse;display:flex;box-shadow:0 0 12px #a855f759}@keyframes avatar-pulse{0%,to{transform:scale(1);box-shadow:0 0 12px #a855f759}50%{transform:scale(1.05);box-shadow:0 0 18px #22d3ee80}}.sidebar-user-info{flex-direction:column;gap:2px;display:flex;overflow:hidden}.sidebar-user-name{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;align-items:center;gap:4px;font-size:15px;font-weight:700;display:flex;overflow:hidden}.sidebar-user-meta{color:var(--text-muted);letter-spacing:.2px;white-space:nowrap;font-size:11px;font-weight:500}.sidebar .search-bar{margin:0;position:relative}.sidebar .search-bar input{border:1px solid var(--border-subtle);border-radius:var(--radius-md);width:100%;color:var(--text-primary);transition:all var(--transition);background:#ffffff05;padding:10px 14px 10px 38px;font-size:13px}.sidebar .search-bar input:focus{border-color:var(--accent-primary);background:#ffffff0a;box-shadow:0 0 12px #a855f71f}.sidebar .search-bar svg{width:16px;height:16px;color:var(--text-muted);position:absolute;top:50%;left:12px;transform:translateY(-50%)}.sidebar-nav{flex-direction:column;flex:1;gap:6px;padding:12px 8px;display:flex}.nav-item{border-radius:var(--radius-md);color:var(--text-secondary);transition:all var(--transition);align-items:center;gap:12px;padding:12px 14px;font-size:14px;font-weight:600;display:flex;position:relative;overflow:hidden}.nav-item:before{content:"";background:var(--accent-primary);opacity:0;width:3px;height:70%;transition:opacity var(--transition);border-radius:0 4px 4px 0;position:absolute;top:15%;left:0}.nav-item:hover{color:var(--text-primary);background:#ffffff08;transform:translate(2px)}.nav-item.active{color:#fff;background:linear-gradient(90deg,#a855f71a 0%,#22d3ee05 100%);border:1px solid #a855f726;box-shadow:0 4px 20px #a855f714}.nav-item.active:before{opacity:1}.nav-item.active svg{color:var(--accent-secondary);filter:drop-shadow(0 0 4px #22d3ee66)}.nav-item svg{width:18px;height:18px;transition:color var(--transition);flex-shrink:0}.main-content{margin-left:var(--sidebar-width);flex:1;min-height:100vh;padding:24px 32px}.card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);transition:all var(--transition);padding:24px}.card:hover{border-color:var(--border)}.card-glass{background:var(--bg-glass);border:1px solid var(--border);border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);padding:24px}.btn{border-radius:var(--radius-sm);transition:all var(--transition);white-space:nowrap;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:600;display:inline-flex}.btn-primary{background:linear-gradient(135deg,var(--accent-primary),#7c3aed);color:#fff;box-shadow:0 2px 12px #8b5cf64d}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 20px #8b5cf680}.btn-secondary{background:var(--bg-card);border:1px solid var(--border);color:var(--text-primary)}.btn-secondary:hover{border-color:var(--accent-primary);background:var(--bg-glass)}.btn-ghost{color:var(--text-secondary);padding:8px 12px}.btn-ghost:hover{color:var(--text-primary);background:var(--bg-glass)}.btn-icon{border-radius:var(--radius-sm);justify-content:center;align-items:center;width:40px;height:40px;padding:0;display:flex}.btn-sm{padding:6px 14px;font-size:13px}.btn-lg{padding:14px 28px;font-size:16px}.btn-danger{background:var(--error);color:#fff}.btn-success{background:var(--success);color:#fff}.input-group{flex-direction:column;gap:6px;display:flex}.input-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;font-size:13px;font-weight:600}.input{background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-primary);transition:all var(--transition);padding:10px 14px;font-size:14px}.input:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px #8b5cf626}.input::placeholder{color:var(--text-muted)}select.input{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239ca3af' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");background-position:right 12px center;background-repeat:no-repeat;padding-right:32px}select.input option{background:var(--bg-secondary);color:var(--text-primary)}.badge{border-radius:var(--radius-full);align-items:center;gap:4px;padding:3px 10px;font-size:12px;font-weight:600;display:inline-flex}.badge-subject{opacity:.9;border:1px solid}.stat-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;display:grid}.stat-card{align-items:center;gap:16px;display:flex}.stat-icon{border-radius:var(--radius-md);justify-content:center;align-items:center;width:48px;height:48px;font-size:22px;display:flex}.stat-info h3{font-size:24px;font-weight:800;line-height:1.2}.stat-info p{color:var(--text-secondary);font-size:13px}.chip{background:var(--bg-glass);border:1px solid var(--border);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition);align-items:center;gap:6px;padding:6px 12px;font-size:13px;display:inline-flex}.chip:hover{border-color:var(--accent-primary);background:#8b5cf626}.chip.active{border-color:var(--accent-primary);color:var(--accent-primary);background:#8b5cf633}.detail-panel{background:var(--bg-secondary);border-left:1px solid var(--border-subtle);z-index:200;width:420px;padding:24px;transition:transform .3s cubic-bezier(.4,0,.2,1);position:fixed;top:0;bottom:0;right:0;overflow-y:auto;transform:translate(100%)}.detail-panel.open{transform:translate(0)}.detail-panel-overlay{z-index:199;opacity:0;pointer-events:none;transition:opacity var(--transition);background:#00000080;position:fixed;inset:0}.detail-panel-overlay.open{opacity:1;pointer-events:auto}.detail-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.detail-content h2{color:var(--accent-primary);text-transform:uppercase;letter-spacing:1px;margin:24px 0 8px;font-size:13px;font-weight:700}.detail-content p,.detail-content li{color:var(--text-secondary);font-size:14px;line-height:1.8}.detail-content ul{padding-left:20px}.detail-meta{border-top:1px solid var(--border-subtle);color:var(--text-muted);gap:16px;margin-top:16px;padding:12px 0;font-size:13px;display:flex}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:300;background:#0009;justify-content:center;align-items:center;padding:20px;animation:.2s fadeIn;display:flex;position:fixed;inset:0}.modal{background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);width:100%;max-width:520px;max-height:90vh;padding:32px;animation:.3s slideUp;overflow-y:auto}.modal-header{justify-content:space-between;align-items:center;margin-bottom:24px;display:flex}.modal-header h2{font-size:20px;font-weight:700}.modal-footer{border-top:1px solid var(--border-subtle);justify-content:flex-end;gap:12px;margin-top:24px;padding-top:16px;display:flex}.onboarding-screen{z-index:1000;background:var(--bg-primary);flex-direction:column;justify-content:center;align-items:center;display:flex;position:fixed;inset:0;overflow:hidden}.onboarding-bg{position:absolute;inset:0;overflow:hidden}.onboarding-bg:before{content:"";background:radial-gradient(circle at 30% 40%,#8b5cf61f 0%,#0000 50%),radial-gradient(circle at 70% 60%,#06b6d414 0%,#0000 50%);width:200%;height:200%;animation:8s ease-in-out infinite bgPulse;position:absolute;top:-50%;left:-50%}.onboarding-content{z-index:1;text-align:center;width:100%;max-width:480px;padding:0 20px;position:relative}.onboarding-content h1{background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin-bottom:8px;font-size:32px;font-weight:800}.onboarding-content p{color:var(--text-secondary);margin-bottom:40px;font-size:15px}.lang-grid{grid-template-columns:1fr 1fr;gap:12px;margin-bottom:32px;display:grid}.lang-card{background:var(--bg-card);border:2px solid var(--border-subtle);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition);text-align:center;padding:20px}.lang-card:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-glow);transform:translateY(-2px)}.lang-card.selected{border-color:var(--accent-primary);background:var(--bg-glass);box-shadow:var(--shadow-glow)}.lang-card .flag{margin-bottom:8px;font-size:32px}.lang-card .lang-name{font-size:16px;font-weight:700}.lang-card .lang-native{color:var(--text-secondary);margin-top:2px;font-size:13px}.profile-form{text-align:left;flex-direction:column;gap:20px;display:flex}.profile-form .input-group{width:100%}.level-selector{gap:8px;display:flex}.level-option{text-align:center;background:var(--bg-card);border:2px solid var(--border-subtle);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition);flex:1;padding:12px;font-size:13px;font-weight:600}.level-option:hover{border-color:var(--accent-primary)}.level-option.selected{border-color:var(--accent-primary);background:var(--bg-glass);color:var(--accent-primary)}.timeline{padding-left:32px;position:relative}.timeline:before{content:"";background:linear-gradient(to bottom,var(--accent-primary),var(--accent-secondary),transparent);width:2px;position:absolute;top:0;bottom:0;left:11px}.timeline-day{margin-bottom:32px}.timeline-date{align-items:center;gap:12px;margin-bottom:16px;display:flex;position:relative}.timeline-date:before{content:"";background:var(--accent-primary);width:12px;height:12px;box-shadow:0 0 10px var(--accent-glow);border-radius:50%;position:absolute;left:-25px}.timeline-date h3{color:var(--text-primary);font-size:15px;font-weight:700}.timeline-date span{color:var(--text-muted);font-size:12px}.timeline-nodes{flex-direction:column;gap:8px;display:flex}.timeline-node{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition);align-items:center;gap:12px;padding:14px 16px;display:flex}.timeline-node:hover{border-color:var(--border);transform:translate(4px)}.timeline-node .node-keyword{font-size:14px;font-weight:600}.timeline-node .node-summary{color:var(--text-secondary);text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:13px;overflow:hidden}.quiz-container{max-width:680px;margin:0 auto}.quiz-progress{background:var(--bg-card);border-radius:3px;height:6px;margin-bottom:24px;overflow:hidden}.quiz-progress-bar{background:linear-gradient(90deg,var(--accent-primary),var(--accent-secondary));border-radius:3px;height:100%;transition:width .5s}.quiz-question{margin-bottom:24px}.quiz-question h3{margin-bottom:20px;font-size:18px;font-weight:600;line-height:1.6}.quiz-question .q-number{color:var(--accent-primary);margin-bottom:8px;font-size:14px;font-weight:700}.quiz-options{flex-direction:column;gap:10px;display:flex}.quiz-option{background:var(--bg-card);border:2px solid var(--border-subtle);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition);padding:14px 18px;font-size:14px}.quiz-option:hover{border-color:var(--accent-primary);background:var(--bg-glass)}.quiz-option.selected{border-color:var(--accent-primary);background:#8b5cf626}.quiz-option.correct{border-color:var(--success);background:#10b9811a}.quiz-option.incorrect{border-color:var(--error);background:#ef44441a}.quiz-score-circle{border:6px solid var(--accent-primary);border-radius:50%;flex-direction:column;justify-content:center;align-items:center;width:160px;height:160px;margin:0 auto 24px;display:flex;position:relative}.quiz-score-circle .score-number{background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:42px;font-weight:800}.quiz-score-circle .score-label{color:var(--text-secondary);font-size:13px}.search-bar{position:relative}.search-bar input{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);transition:all var(--transition);padding:10px 36px 10px 40px;font-size:14px}.search-bar input:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px #8b5cf61a}.search-icon-btn{width:28px;height:28px;color:var(--text-muted);border-radius:var(--radius-sm);transition:all var(--transition);z-index:1;cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;padding:0;display:flex;position:absolute;top:50%;left:6px;transform:translateY(-50%)}.search-icon-btn:hover{color:var(--accent-primary);background:#8b5cf61a}.search-clear-btn{width:22px;height:22px;color:var(--text-muted);transition:all var(--transition);z-index:1;cursor:pointer;background:#ffffff0f;border:none;border-radius:50%;justify-content:center;align-items:center;padding:0;display:flex;position:absolute;top:50%;right:8px;transform:translateY(-50%)}.search-clear-btn:hover{color:var(--text-primary);background:#ffffff1f}.search-results{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-md);z-index:50;max-height:320px;position:absolute;top:calc(100% + 4px);left:0;right:0;overflow-y:auto;box-shadow:0 8px 32px #0006}.search-result-item{cursor:pointer;border-bottom:1px solid var(--border-subtle);transition:background var(--transition);padding:12px 16px}.search-result-item:hover{background:var(--bg-glass)}.search-result-item:last-child{border-bottom:none}.duplicate-alert{border-radius:var(--radius-md);background:#f59e0b1a;border:1px solid #f59e0b4d;align-items:flex-start;gap:12px;margin-bottom:16px;padding:16px;display:flex}.duplicate-alert svg{color:var(--warning);flex-shrink:0;margin-top:2px}.duplicate-alert .alert-text h4{color:var(--warning);margin-bottom:4px;font-size:14px;font-weight:600}.duplicate-alert .alert-text p{color:var(--text-secondary);font-size:13px}.loading-dots{justify-content:center;align-items:center;gap:6px;padding:24px;display:flex}.loading-dots span{background:var(--accent-primary);border-radius:50%;width:8px;height:8px;animation:1.4s ease-in-out infinite dotPulse}.loading-dots span:nth-child(2){animation-delay:.2s}.loading-dots span:nth-child(3){animation-delay:.4s}.spinner{border:3px solid var(--border-subtle);border-top-color:var(--accent-primary);border-radius:50%;width:40px;height:40px;margin:0 auto;animation:.8s linear infinite spin}.mesh-container{border-radius:var(--radius-lg);background:var(--bg-primary);border:1px solid var(--border-subtle);width:100%;height:calc(100vh - 120px);position:relative;overflow:hidden}.mesh-filters{z-index:10;flex-wrap:wrap;gap:8px;display:flex;position:absolute;top:16px;left:16px}.mesh-legend{z-index:10;background:var(--bg-card);border-radius:var(--radius-full);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--border-subtle);flex-wrap:wrap;gap:12px;padding:8px 16px;display:flex;position:absolute;bottom:16px;left:16px}.mesh-legend-item{color:var(--text-secondary);align-items:center;gap:6px;font-size:12px;display:flex}.mesh-legend-dot{border-radius:50%;width:10px;height:10px}.keyword-input-panel{max-width:640px;margin:0 auto}.ai-response{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);margin-top:20px;padding:20px;animation:.4s fadeIn}.ai-response h2{color:var(--accent-primary);align-items:center;gap:8px;margin-bottom:12px;font-size:14px;font-weight:700;display:flex}.ai-response .markdown-content{color:var(--text-secondary);font-size:14px;line-height:1.8}.ai-response .markdown-content h2{color:var(--text-primary);margin-top:20px;font-size:15px}.ai-response .markdown-content ul{padding-left:20px}.ai-response .markdown-content li{margin-bottom:4px}.related-chips{flex-wrap:wrap;gap:8px;margin-top:16px;display:flex}.fab{background:linear-gradient(135deg,var(--accent-primary),#7c3aed);color:#fff;z-index:50;height:56px;transition:all var(--transition);border-radius:28px;justify-content:center;align-items:center;gap:8px;padding:0 24px;font-size:16px;font-weight:700;display:flex;position:fixed;bottom:24px;right:24px;box-shadow:0 4px 24px #8b5cf666}.fab:hover{transform:translateY(-2px);box-shadow:0 6px 32px #8b5cf699}.page-header{margin-bottom:28px}.page-header h1{margin-bottom:4px;font-size:28px;font-weight:800}.page-header p{color:var(--text-secondary);font-size:14px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes dotPulse{0%,80%,to{opacity:.4;transform:scale(.6)}40%{opacity:1;transform:scale(1)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes bgPulse{0%,to{transform:translate(0)rotate(0)}50%{transform:translate(2%,1%)rotate(1deg)}}@keyframes nodeGlow{0%,to{box-shadow:0 0 5px var(--accent-glow)}50%{box-shadow:0 0 20px var(--accent-glow)}}.mobile-header{background:var(--bg-secondary);border-bottom:1px solid var(--border-subtle);z-index:99;justify-content:space-between;align-items:center;height:56px;padding:0 16px;display:none;position:fixed;top:0;left:0;right:0}.mobile-nav{background:var(--bg-secondary);border-top:1px solid var(--border-subtle);z-index:99;justify-content:space-around;align-items:center;height:64px;padding:0 8px;display:none;position:fixed;bottom:0;left:0;right:0}.mobile-nav-item{color:var(--text-muted);transition:color var(--transition);flex-direction:column;align-items:center;gap:2px;padding:8px;font-size:11px;display:flex}.mobile-nav-item.active{color:var(--accent-primary)}.mobile-nav-item svg{width:22px;height:22px}@media (max-width:768px){.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main-content{margin-left:0;padding:72px 16px 80px}.mobile-header,.mobile-nav{display:flex}.stat-grid,.lang-grid{grid-template-columns:1fr 1fr}.detail-panel{width:100%}.mesh-container{height:calc(100vh - 200px)}.fab{bottom:80px}}.landing-page{background:var(--bg-primary);flex-direction:column;min-height:100vh;display:flex;position:relative;overflow:hidden}.landing-hero{text-align:center;z-index:10;flex-direction:column;flex:1;justify-content:center;align-items:center;padding:80px 20px;display:flex;position:relative}.landing-hero h1{background:linear-gradient(135deg,#a855f7,#3b82f6);-webkit-text-fill-color:transparent;opacity:0;-webkit-background-clip:text;margin-bottom:24px;font-size:56px;font-weight:800;line-height:1.2;animation:.8s cubic-bezier(.16,1,.3,1) forwards slideUp}.landing-hero p{color:var(--text-secondary);opacity:0;max-width:600px;margin:0 auto 40px;font-size:20px;line-height:1.6;animation:.8s cubic-bezier(.16,1,.3,1) .2s forwards slideUp}.landing-cta{opacity:0;justify-content:center;gap:16px;animation:.8s cubic-bezier(.16,1,.3,1) .4s forwards slideUp;display:flex}.landing-features{z-index:10;opacity:0;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;width:100%;max-width:1000px;margin:60px auto;padding:0 20px;animation:.8s cubic-bezier(.16,1,.3,1) .6s forwards slideUp;display:grid}.feature-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);text-align:left;transition:all var(--transition);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);padding:32px}.feature-card:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-glow);transform:translateY(-4px)}.feature-icon{background:var(--bg-glass);border-radius:var(--radius-md);width:48px;height:48px;color:var(--accent-primary);justify-content:center;align-items:center;margin-bottom:20px;font-size:24px;display:flex}.feature-card h3{margin-bottom:12px;font-size:20px;font-weight:700}.feature-card p{color:var(--text-secondary);font-size:15px;line-height:1.6}.auth-page{background:var(--bg-primary);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex;position:relative;overflow:hidden}.auth-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);z-index:10;opacity:0;width:100%;max-width:440px;padding:40px;animation:.4s forwards slideUp;box-shadow:0 24px 48px #0003}.auth-header{text-align:center;margin-bottom:32px}.auth-logo{background:linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));border-radius:var(--radius-lg);width:56px;height:56px;box-shadow:var(--shadow-glow);justify-content:center;align-items:center;margin-bottom:16px;font-size:28px;display:inline-flex}.auth-header h1{margin-bottom:8px;font-size:28px;font-weight:800}.auth-header p{color:var(--text-secondary);font-size:15px}.auth-form{flex-direction:column;gap:20px;display:flex}.auth-divider{text-align:center;color:var(--text-muted);align-items:center;margin:24px 0;font-size:13px;display:flex}.auth-divider:before,.auth-divider:after{content:"";border-bottom:1px solid var(--border-subtle);flex:1}.auth-divider:not(:empty):before{margin-right:16px}.auth-divider:not(:empty):after{margin-left:16px}.btn-social{background:var(--bg-secondary);border:1px solid var(--border-subtle);color:var(--text-primary);justify-content:center;font-weight:500;display:flex}.btn-social:hover{background:var(--bg-glass);border-color:var(--border)}.auth-footer{text-align:center;color:var(--text-secondary);margin-top:32px;font-size:14px}.auth-footer a{color:var(--accent-primary);transition:color var(--transition);font-weight:600}.auth-footer a:hover{color:var(--accent-secondary)}.ambient-orb{filter:blur(80px);opacity:.5;z-index:1;pointer-events:none;border-radius:50%;animation:10s ease-in-out infinite alternate float;position:absolute}.ambient-orb-1{background:#8b5cf64d;width:400px;height:400px;top:-100px;left:-100px}.ambient-orb-2{background:#06b6d433;width:500px;height:500px;animation-delay:-5s;bottom:-150px;right:-100px}@keyframes float{0%{transform:translate(0)}to{transform:translate(30px,50px)}}.math-block{border:1px solid var(--border);border-radius:var(--radius-md);text-align:center;background:linear-gradient(135deg,#8b5cf60f,#06b6d40a);margin:16px 0;padding:16px 20px;overflow-x:auto}.math-block .katex{font-size:1.15em}.math-error{color:var(--warning);font-size:13px;font-style:italic}.katex{color:var(--text-primary)}.katex .katex-html{white-space:nowrap}.structured-content{color:var(--text-secondary);font-size:14px;line-height:1.9}.structured-content p{margin-bottom:10px}.structured-content strong{color:var(--text-primary);font-weight:700}.structured-content em{color:var(--accent-secondary);font-style:italic}.content-section-header{border-left:3px solid var(--accent-primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:linear-gradient(135deg,#8b5cf614,#06b6d40a);align-items:center;gap:8px;margin:24px 0 12px;padding:10px 14px;display:flex}.content-section-header h3{color:var(--text-primary);letter-spacing:.3px;margin:0;font-size:15px;font-weight:700}.section-icon{flex-shrink:0;font-size:16px}.content-list-item{color:var(--text-secondary);padding:6px 0 6px 16px;font-size:14px;line-height:1.7;list-style:none;position:relative}.content-list-item:before{content:"•";color:var(--accent-primary);font-weight:700;position:absolute;left:0}.content-list-numbered:before{content:none}.content-list-numbered .list-number{color:var(--accent-primary);margin-right:4px;font-weight:700}.content-table-wrapper{border-radius:var(--radius-md);border:1px solid var(--border-subtle);margin:16px 0;overflow-x:auto}.content-table{border-collapse:collapse;width:100%;font-size:13px}.content-table th{text-align:left;color:var(--text-primary);border-bottom:2px solid var(--border);white-space:nowrap;background:linear-gradient(135deg,#8b5cf61f,#06b6d414);padding:10px 14px;font-weight:700}.content-table td{border-bottom:1px solid var(--border-subtle);color:var(--text-secondary);padding:8px 14px;line-height:1.6}.content-table tr:last-child td{border-bottom:none}.content-table tr:hover td{background:var(--bg-glass)}.content-divider{background:linear-gradient(90deg, transparent, var(--border), transparent);border:none;height:1px;margin:24px 0}.inline-code{color:var(--accent-primary);background:#8b5cf61f;border-radius:4px;padding:2px 6px;font-family:Fira Code,Consolas,monospace;font-size:13px}.badge-curriculum{color:var(--success);border-radius:var(--radius-full);background:#10b9811a;border:1px solid #10b9814d;margin-left:6px;padding:3px 10px;font-size:11px;font-weight:600}.detail-math-content .content-section-header{margin-top:20px}.detail-math-content .math-block,.detail-math-content .content-table-wrapper{margin:12px 0}.ai-explanation-content{font-size:15px;line-height:1.9}.ai-explanation-content .math-block{margin:12px 0;padding:12px 16px}.ai-explanation-content strong{color:var(--accent-primary)}.detailed-content .content-section-header{margin-top:16px}.detailed-content .content-section-header:first-child{margin-top:0}