@import"https://fonts.googleapis.com/css2?family=Sora:wght@400;600;700;800&family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500;9..40,600;9..40,700&family=JetBrains+Mono:wght@400;500;700&display=swap";:root{--font-display: "Sora", sans-serif;--font-body: "DM Sans", sans-serif;--font-mono: "JetBrains Mono", monospace;--bg: #0A0A0C;--bg-elevated: #141416;--bg-elevated-2: #1C1C20;--border: #252528;--border-hover: #3A3A40;--text-primary: #EDEDEF;--text-secondary: #8B8B92;--text-tertiary: #5C5C64;--accent: #F59E0B;--accent-hover: #FBBF24;--accent-muted: rgba(245, 158, 11, .12);--accent-secondary: #EA580C;--accent-secondary-hover: #FB923C;--terminal-bg: #0D0D0F;--terminal-border: #1E1E22;--terminal-green: #F59E0B;--terminal-green-dim: rgba(245, 158, 11, .15);--terminal-text: #C8C8CC;--nav-blur: rgba(10, 10, 12, .8);--glow: rgba(245, 158, 11, .07);--glow-strong: rgba(245, 158, 11, .15);--radius: 12px;--radius-lg: 20px;--radius-terminal: 10px;--sidebar-width: 260px}[data-theme=light]{--bg: #F2F2F5;--bg-elevated: #FFFFFF;--bg-elevated-2: #F8F8FA;--border: #D4D4D9;--border-hover: #B0B0B8;--text-primary: #1C1C1F;--text-secondary: #6C6C74;--text-tertiary: #9C9CA4;--accent: #D97706;--accent-hover: #F59E0B;--accent-muted: rgba(217, 119, 6, .1);--accent-secondary: #EA580C;--accent-secondary-hover: #FB923C;--terminal-bg: #1A1A1E;--terminal-border: #2C2C32;--terminal-green: #D97706;--terminal-green-dim: rgba(217, 119, 6, .12);--terminal-text: #D4D4D8;--nav-blur: rgba(242, 242, 245, .85);--glow: rgba(217, 119, 6, .06);--glow-strong: rgba(217, 119, 6, .12)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-family:var(--font-body);color:var(--text-primary);background:var(--bg);scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{min-height:100vh;overflow-x:hidden;line-height:1.6}::selection{background:var(--accent);color:var(--bg)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--border-hover)}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}img{max-width:100%;display:block}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}.text-secondary{color:var(--text-secondary)}.btn{padding:10px 20px;border-radius:8px;font-family:var(--font-body);font-weight:600;font-size:14px;transition:all .25s ease;text-decoration:none;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}.btn-ghost{color:var(--text-secondary);background:transparent;border:1px solid var(--border)}.btn-ghost:hover{color:var(--text-primary);border-color:var(--border-hover);background:var(--bg-elevated)}.btn-primary{color:#0a0a0c;background:var(--accent);font-weight:700;box-shadow:0 0 20px var(--glow-strong)}.btn-primary:hover{background:var(--accent-hover);box-shadow:0 4px 24px var(--glow-strong)}.navbar{position:fixed;top:0;left:0;right:0;z-index:100;padding:16px 0;background:var(--nav-blur);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border);animation:navIn .6s ease-out both}@keyframes navIn{0%{opacity:0;transform:translateY(-16px)}to{opacity:1;transform:translateY(0)}}.navbar-inner{display:flex;align-items:center;justify-content:space-between}.logo{display:flex;align-items:center;transition:opacity .2s}.logo:hover{opacity:.85}.nav-actions{display:flex;align-items:center;gap:8px}.app-layout{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-width);flex-shrink:0;height:100vh;position:sticky;top:0;background:var(--bg-elevated);border-right:1px solid var(--border);display:flex;flex-direction:column;z-index:90}.sidebar-inner{display:flex;flex-direction:column;height:100%;padding:24px 12px;gap:4px}.sidebar-logo{display:flex;align-items:center;padding:0 8px 20px;border-bottom:1px solid var(--border);margin-bottom:12px}.sidebar-nav{display:flex;flex-direction:column;gap:2px;flex:1}.sidebar-link{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:8px;font-size:14px;font-weight:500;color:var(--text-secondary);transition:all .2s}.sidebar-link:hover{background:var(--bg-elevated-2);color:var(--text-primary)}.sidebar-link.active{background:var(--accent-muted);color:var(--accent);font-weight:600}.sidebar-footer{padding-top:12px;border-top:1px solid var(--border);margin-top:4px}.sidebar-logout{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:8px;font-size:14px;font-weight:500;color:var(--text-secondary);width:100%;text-align:left;transition:all .2s}.sidebar-logout:hover{background:#ef44441a;color:#ef4444}.dashboard-main{flex:1;min-height:100vh}.dashboard-main:has(.welcome-page){display:flex;align-items:center;justify-content:center}.courses-page{padding:40px;max-width:1200px}.courses-header{margin-bottom:32px}.courses-title{font-family:var(--font-display);font-weight:800;font-size:32px;letter-spacing:-.03em;margin-bottom:8px}.courses-subtitle{color:var(--text-secondary);font-size:16px}.welcome-page{text-align:center;padding:40px 24px}.welcome-page h1{font-family:var(--font-display);font-weight:800;font-size:36px;letter-spacing:-.03em;margin-bottom:8px}.welcome-page p{font-size:16px}.admin-page{padding:40px;max-width:960px}.admin-title{font-family:var(--font-display);font-weight:800;font-size:32px;letter-spacing:-.03em;margin-bottom:8px}.admin-subtitle{color:var(--text-secondary);font-size:16px}.hero{position:relative;min-height:100vh;display:flex;align-items:center;padding:120px 0 80px;overflow:hidden}.hero-glow{position:absolute;top:-20%;right:-10%;width:600px;height:600px;background:radial-gradient(circle,var(--glow-strong) 0%,transparent 70%);pointer-events:none}.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;position:relative;z-index:1}@keyframes fadeUp{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(40px)}to{opacity:1;transform:translate(0)}}.hero-content{animation:fadeUp .8s ease-out .15s both}.hero-badge{display:inline-flex;align-items:center;gap:8px;font-weight:500;font-size:13px;color:var(--accent);background:var(--accent-muted);padding:6px 14px;border-radius:100px;margin-bottom:24px;animation:fadeUp .5s ease-out .3s both}.badge-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}.hero-title{font-family:var(--font-display);font-weight:800;font-size:clamp(36px,6vw,68px);line-height:1.1;letter-spacing:-.04em;margin-bottom:20px;animation:fadeUp .6s ease-out .35s both}.hero-highlight{background:linear-gradient(135deg,var(--accent) 0%,var(--accent-secondary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:18px;line-height:1.7;color:var(--text-secondary);max-width:480px;margin-bottom:36px;animation:fadeUp .6s ease-out .45s both}.hero-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;animation:fadeUp .6s ease-out .55s both}.btn-action{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:10px;font-weight:600;font-size:15px;transition:all .3s cubic-bezier(.22,1,.36,1);text-decoration:none}.btn-action-primary{color:#0a0a0c;background:var(--accent);box-shadow:0 0 0 1px var(--accent),0 4px 24px var(--glow-strong)}.btn-action-primary:hover{background:var(--accent-hover);transform:translateY(-3px) scale(1.02);box-shadow:0 8px 32px var(--glow-strong)}.btn-action-primary svg{transition:transform .3s ease}.btn-action-primary:hover svg{transform:translate(4px)}.btn-action-secondary{color:var(--text-primary);background:var(--bg-elevated);border:1px solid var(--border)}.btn-action-secondary:hover{border-color:var(--border-hover);background:var(--bg-elevated-2);transform:translateY(-3px);box-shadow:0 4px 20px #00000026}.hero-visual{animation:slideIn 1s ease-out .2s both}.terminal-wrapper{position:relative}.terminal-wrapper:before{content:"";position:absolute;inset:-2px;border-radius:calc(var(--radius-terminal) + 4px);background:linear-gradient(135deg,var(--accent),var(--accent-secondary));opacity:.15;z-index:-1}.terminal{background:var(--terminal-bg);border:1px solid var(--terminal-border);border-radius:var(--radius-terminal);overflow:hidden;font-family:var(--font-mono);font-size:13px;line-height:1.6;box-shadow:0 0 0 1px #ffffff08,0 20px 60px #0006}.terminal-header{display:flex;align-items:center;padding:12px 16px;background:var(--bg-elevated);border-bottom:1px solid var(--terminal-border);gap:12px}.terminal-dots{display:flex;gap:6px;flex-shrink:0}.dot{width:10px;height:10px;border-radius:50%}.dot-red{background:#ff5f56}.dot-yellow{background:#ffbd2e}.dot-green{background:#27c93f}.terminal-title{font-family:var(--font-body);font-size:12px;color:var(--text-tertiary);font-weight:500}.terminal-spacer{flex:1}.terminal-body{padding:16px;min-height:280px;max-height:400px;overflow-y:auto;display:flex;flex-direction:column;gap:2px}.terminal-line{display:flex;align-items:flex-start;gap:8px;flex-wrap:wrap;padding:1px 0}.terminal-line.welcome{margin-bottom:4px}.prompt{color:var(--terminal-green);flex-shrink:0;font-weight:500}.cmd-text{color:var(--terminal-text)}.cmd-welcome{color:var(--text-tertiary);font-style:italic}.welcome-out{color:var(--accent);font-size:12px;padding-bottom:12px;margin-bottom:8px;border-bottom:1px solid var(--terminal-border)}.terminal-line-group{margin-bottom:2px}.output-line{padding-left:4px}.output-arrow{color:var(--text-tertiary);font-size:11px;flex-shrink:0}.output-text{color:var(--text-tertiary);font-size:12px}.cursor{display:inline-block;width:8px;height:16px;background:var(--terminal-green);vertical-align:text-bottom;margin-left:1px;opacity:0;border-radius:1px}.cursor.visible{opacity:1}.current-line-group{margin-top:2px}.footer{padding:64px 0 32px}.footer-border{height:1px;margin-bottom:48px;background:linear-gradient(90deg,transparent,var(--accent),var(--accent-secondary),transparent);opacity:.3}.footer-grid{display:grid;grid-template-columns:1fr 2fr;gap:64px}.footer-logo{display:flex;align-items:center;margin-bottom:16px}.footer-desc{color:var(--text-secondary);font-size:14px;line-height:1.7;max-width:320px}.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.footer-col h4{font-family:var(--font-display);font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--text-tertiary);margin-bottom:16px}.footer-col a{display:block;color:var(--text-secondary);font-size:14px;padding:4px 0;transition:color .2s}.footer-col a:hover{color:var(--accent)}.footer-bottom{margin-top:48px;padding-top:24px;border-top:1px solid var(--border);color:var(--text-tertiary);font-size:13px;text-align:center}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:100px 24px 80px}.auth-wrap{display:flex;flex-direction:column;align-items:flex-start;gap:16px}.auth-back{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:500;color:var(--text-secondary);transition:color .2s}.auth-back:hover{color:var(--accent)}.auth-card{width:100%;max-width:420px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);padding:40px;animation:fadeUp .4s ease-out both}.auth-title{font-family:var(--font-display);font-weight:800;font-size:26px;letter-spacing:-.03em;margin-bottom:8px}.auth-subtitle{font-size:15px;color:var(--text-secondary);margin-bottom:28px}.auth-error{background:#ef44441a;border:1px solid rgba(239,68,68,.25);border-radius:8px;padding:12px 16px;font-size:13px;color:#ef4444;margin-bottom:20px;line-height:1.5}.auth-form{display:flex;flex-direction:column;gap:16px}.field{display:flex;flex-direction:column;gap:6px}.field label{font-size:13px;font-weight:600;color:var(--text-primary)}.field input{font-family:var(--font-body);font-size:14px;color:var(--text-primary);background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:10px 14px;outline:none;transition:border-color .2s,box-shadow .2s}.field input::placeholder{color:var(--text-tertiary)}.field input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-muted)}.auth-btn{padding:12px 20px;border-radius:8px;font-weight:600;font-size:14px;transition:all .25s ease;display:flex;align-items:center;justify-content:center;gap:8px}.auth-btn:disabled{opacity:.6;cursor:not-allowed}.auth-btn-primary{color:#0a0a0c;background:var(--accent);margin-top:4px}.auth-btn-primary:hover:not(:disabled){background:var(--accent-hover);box-shadow:0 4px 20px var(--glow-strong)}.auth-btn-social{color:var(--text-primary);background:var(--bg);border:1px solid var(--border);width:100%}.auth-btn-social:hover:not(:disabled){border-color:var(--border-hover);background:var(--bg-elevated-2)}.auth-btn-ghost{color:var(--text-secondary);background:none;border:1px solid var(--border);width:100%;margin-top:8px}.auth-btn-ghost:hover:not(:disabled){color:var(--text-primary);border-color:var(--border-hover)}.auth-divider{display:flex;align-items:center;gap:16px;margin:24px 0;color:var(--text-tertiary);font-size:12px;font-weight:500;text-transform:uppercase;letter-spacing:.05em}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--border)}.social-btns{display:flex;flex-direction:column;gap:10px}.auth-forgot{background:none;border:none;color:var(--accent);font-size:13px;font-weight:500;cursor:pointer;padding:8px 0 0;display:block;transition:opacity .2s}.auth-forgot:hover{opacity:.8}.auth-switch{margin-top:24px;text-align:center;font-size:14px;color:var(--text-secondary)}.auth-switch a{color:var(--accent);font-weight:600;transition:opacity .2s}.auth-switch a:hover{opacity:.8}.loading-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg)}.loading-spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.mobile-header{display:none;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-elevated);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:80}.mobile-menu-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:8px;color:var(--text-primary);transition:background .2s}.mobile-menu-btn:hover{background:var(--bg-elevated-2)}.mobile-header-title{font-family:var(--font-display);font-weight:700;font-size:16px;letter-spacing:-.02em}.sidebar-overlay{display:none;position:fixed;inset:0;background:#00000080;z-index:85}.main-content{padding:32px;max-width:1200px}.sidebar-user{padding:10px 12px;font-size:12px;color:var(--text-tertiary);word-break:break-all}.dashboard-welcome{margin-bottom:40px}.dashboard-welcome h1{font-family:var(--font-display);font-weight:800;font-size:36px;letter-spacing:-.03em;margin-bottom:4px}.dashboard-empty{text-align:center;padding:80px 20px}.dashboard-empty p{font-size:18px;color:var(--text-secondary)}.dashboard-section-title{font-family:var(--font-display);font-weight:700;font-size:22px;letter-spacing:-.02em;margin-bottom:20px}.courses-grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}.courses-empty{grid-column:1 / -1;text-align:center;padding:80px 20px;color:var(--text-secondary);font-size:18px}.course-card{display:flex;flex-direction:column;text-align:left;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all .25s ease;cursor:pointer}.course-card:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:0 8px 32px var(--glow)}.course-card-img{width:100%;aspect-ratio:16 / 9;overflow:hidden;background:var(--bg-elevated-2)}.course-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}.course-card:hover .course-card-img img{transform:scale(1.03)}.course-card-body{padding:20px;flex:1;display:flex;flex-direction:column;gap:4px}.course-card-category{font-size:12px;font-weight:600;color:var(--accent);text-transform:uppercase;letter-spacing:.06em}.course-card-title{font-family:var(--font-display);font-weight:700;font-size:18px;letter-spacing:-.02em;margin:2px 0;color:var(--text-primary)}.course-card-teacher{font-size:14px;color:var(--text-secondary)}.course-card-desc{font-size:14px;color:var(--text-secondary);margin-top:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.course-detail-cover{width:100%;max-height:400px;overflow:hidden;border-radius:var(--radius);margin:16px 0 24px;background:var(--bg-elevated-2)}.course-detail-cover img{width:100%;height:100%;object-fit:cover}.course-detail-meta{margin-bottom:20px}.course-detail-title{font-family:var(--font-display);font-weight:800;font-size:32px;letter-spacing:-.03em;margin-bottom:12px;color:var(--text-primary)}.course-detail-info-row{display:flex;gap:24px;flex-wrap:wrap}.course-detail-info-item{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--text-secondary)}.course-detail-enroll{margin-bottom:32px}.lesson-list{margin-top:16px}.lesson-list-title{font-family:var(--font-display);font-weight:700;font-size:20px;letter-spacing:-.02em;display:flex;align-items:center;gap:12px}.lesson-list-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.lesson-list-badge{font-family:var(--font-body);font-size:11px;font-weight:600;color:var(--accent);background:var(--accent-muted);padding:3px 10px;border-radius:100px}.unenroll-btn{font-size:13px;color:#ef4444!important;border-color:#ef44444d!important}.unenroll-btn:hover{background:#ef44441a!important;border-color:#ef4444!important}.lesson-card{display:flex;align-items:center;gap:16px;width:100%;text-align:left;padding:12px;border-radius:10px;margin-bottom:8px;background:var(--bg-elevated);border:1px solid var(--border);transition:all .2s;cursor:pointer}.lesson-card:hover{border-color:var(--border-hover);background:var(--bg-elevated-2)}.lesson-card-thumb{width:80px;height:56px;object-fit:cover;border-radius:6px;flex-shrink:0;background:var(--bg-elevated-2)}.lesson-card-body{flex:1;min-width:0}.lesson-card-title{font-family:var(--font-display);font-weight:600;font-size:15px;letter-spacing:-.01em}.lesson-card-desc{font-size:13px;color:var(--text-secondary);margin-top:2px}.lesson-card-arrow{flex-shrink:0;color:var(--text-tertiary)}.lesson-title{font-family:var(--font-display);font-weight:800;font-size:28px;letter-spacing:-.03em;margin:16px 0 8px;color:var(--text-primary)}.lesson-video{position:relative;width:100%;aspect-ratio:16 / 9;border-radius:var(--radius);overflow:hidden;margin-bottom:24px;background:#000;border:1px solid var(--border)}.lesson-video iframe{position:absolute;inset:0;width:100%;height:100%;border:none}.lesson-notes{margin-bottom:32px;padding:24px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius)}.lesson-notes-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.lesson-notes-header h2{font-family:var(--font-display);font-weight:700;font-size:18px;letter-spacing:-.02em;margin:0}.pdf-notes-export{display:none}.lesson-notes-content{font-size:15px;line-height:1.7;color:var(--text-secondary)}.lesson-notes-content h1,.lesson-notes-content h2,.lesson-notes-content h3,.lesson-notes-content h4{font-weight:700;margin:16px 0 8px;color:var(--text-primary);font-family:var(--font-display);letter-spacing:-.02em}.lesson-notes-content h1{font-size:22px}.lesson-notes-content h2{font-size:18px}.lesson-notes-content h3{font-size:16px}.lesson-notes-content p{margin-bottom:8px}.lesson-notes-content ul,.lesson-notes-content ol{padding-left:20px;margin-bottom:8px}.lesson-notes-content li{margin-bottom:4px}.lesson-notes-content code{background:var(--bg);padding:2px 6px;border-radius:4px;font-family:var(--font-mono);font-size:13px;color:var(--accent)}.lesson-notes-content pre{background:var(--bg);padding:16px;border-radius:8px;overflow-x:auto;margin-bottom:12px;border:1px solid var(--border)}.lesson-notes-content pre code{background:none;padding:0}.lesson-notes-content blockquote{border-left:4px solid var(--accent);padding-left:16px;margin:12px 0;color:var(--text-secondary)}.lesson-notes-content strong{font-weight:700;color:var(--text-primary)}.lesson-notes-content em{font-style:italic}.lesson-notes-content a{color:var(--accent);text-decoration:underline}.lesson-notes-content hr{border:none;border-top:1px solid var(--border);margin:20px 0}.lesson-desc{font-size:15px;line-height:1.7;color:var(--text-secondary);margin-bottom:20px}.course-detail-description{font-size:16px;line-height:1.7;color:var(--text-secondary);margin-bottom:32px;max-width:720px}.course-detail-description h1,.course-detail-description h2,.course-detail-description h3,.course-detail-description h4{font-weight:700;margin:16px 0 8px;color:var(--text-primary);font-family:var(--font-display);letter-spacing:-.02em}.course-detail-description h1{font-size:24px}.course-detail-description h2{font-size:20px}.course-detail-description h3{font-size:18px}.course-detail-description p{margin-bottom:8px}.course-detail-description ul,.course-detail-description ol{padding-left:20px;margin-bottom:8px}.course-detail-description li{margin-bottom:4px}.course-detail-description code{background:var(--bg);padding:2px 6px;border-radius:4px;font-family:var(--font-mono);font-size:14px;color:var(--accent)}.course-detail-description pre{background:var(--bg);padding:16px;border-radius:8px;overflow-x:auto;margin-bottom:12px;border:1px solid var(--border)}.course-detail-description pre code{background:none;padding:0}.course-detail-description blockquote{border-left:4px solid var(--accent);padding-left:16px;margin:12px 0;color:var(--text-secondary)}.course-detail-description strong{font-weight:700;color:var(--text-primary)}.course-detail-description em{font-style:italic}.course-detail-description a{color:var(--accent);text-decoration:underline}.course-detail-description hr{border:none;border-top:1px solid var(--border);margin:20px 0}.lesson-nav{display:flex;align-items:center;margin-top:24px;padding-top:24px;border-top:1px solid var(--border)}.quiz-section{margin-bottom:32px}.quiz-section h2{font-family:var(--font-display);font-weight:700;font-size:18px;letter-spacing:-.02em;margin-bottom:16px}.quiz-card{padding:20px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:16px}.quiz-question{font-weight:600;font-size:15px;margin-bottom:12px}.quiz-options{display:flex;flex-direction:column;gap:8px}.quiz-option{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:12px 14px;border-radius:8px;font-size:14px;color:var(--text-primary);background:var(--bg);border:1px solid var(--border);transition:all .2s;cursor:pointer}.quiz-option:hover:not(:disabled){border-color:var(--border-hover);background:var(--bg-elevated-2)}.quiz-option.selected:not(:disabled){border-color:var(--accent);background:var(--accent-muted)}.quiz-option.correct{border-color:#22c55e;background:#22c55e14}.quiz-option.wrong{border-color:#ef4444;background:#ef444414}.quiz-option:disabled{cursor:default;opacity:.85}.quiz-option-letter{display:flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:6px;font-size:12px;font-weight:700;background:var(--bg-elevated-2);flex-shrink:0}.error-state{text-align:center;padding:80px 20px;font-size:18px;color:var(--text-secondary)}.admin-header{display:flex;align-items:center;gap:16px;margin-bottom:20px}.admin-back-btn{flex-shrink:0}.admin-toolbar{margin-bottom:24px}.admin-form{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:24px}.admin-form h3{font-family:var(--font-display);font-weight:700;font-size:18px;letter-spacing:-.02em;margin-bottom:16px}.admin-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.admin-form-full{grid-column:1 / -1}.admin-form-grid .field textarea{font-family:var(--font-body);font-size:14px;color:var(--text-primary);background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:10px 14px;outline:none;resize:vertical}.admin-form-grid .field textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-muted)}.admin-form-preview{background:var(--bg);border:1px solid var(--border);border-radius:8px;overflow:hidden;height:80px;display:flex;align-items:center;justify-content:center}.admin-form-preview img{width:100%;height:100%;object-fit:cover}.admin-form-preview-empty{font-size:12px;color:var(--text-tertiary)}.admin-form-actions{display:flex;gap:8px;margin-top:16px}.admin-course-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}.admin-course-card{display:flex;flex-direction:column;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:border-color .2s}.admin-course-card:hover{border-color:var(--border-hover)}.admin-course-card-img{width:100%;aspect-ratio:16 / 9;overflow:hidden;background:var(--bg-elevated-2)}.admin-course-card-img img{width:100%;height:100%;object-fit:cover}.admin-course-card-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;color:var(--text-tertiary)}.admin-course-card-body{padding:16px;flex:1}.admin-course-card-body .course-card-category{font-size:11px;font-weight:600;color:var(--accent);text-transform:uppercase;letter-spacing:.06em}.admin-course-card-body h3{font-family:var(--font-display);font-weight:700;font-size:16px;letter-spacing:-.02em;margin:4px 0;color:var(--text-primary)}.admin-course-card-actions{display:flex;gap:4px;padding:12px 16px;border-top:1px solid var(--border)}.admin-course-card-actions .btn{flex:1;justify-content:center;font-size:13px;padding:8px}.admin-delete{color:#ef4444!important}.admin-delete:hover{background:#ef44441a!important;border-color:#ef4444!important}.admin-empty-card{grid-column:1 / -1;text-align:center;padding:60px 20px;color:var(--text-secondary)}.admin-empty-card p{font-size:18px;margin-bottom:4px}.admin-empty-card span{font-size:14px}.admin-lesson-list{display:flex;flex-direction:column;gap:6px}.admin-lesson-item{display:flex;align-items:center;gap:12px;padding:10px 12px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:8px;transition:border-color .2s}.admin-lesson-item:hover{border-color:var(--border-hover)}.admin-lesson-order{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:6px;font-size:12px;font-weight:700;background:var(--bg-elevated-2);color:var(--text-tertiary);flex-shrink:0}.admin-lesson-thumb{width:56px;height:40px;object-fit:cover;border-radius:4px;flex-shrink:0;background:var(--bg-elevated-2)}.admin-lesson-info{flex:1;display:flex;flex-direction:column;gap:2px}.admin-lesson-info strong{font-size:14px}.admin-lesson-info .text-secondary{font-size:12px}.admin-lesson-actions{display:flex;gap:4px;flex-shrink:0}.admin-lesson-actions .btn{font-size:13px;padding:6px 12px}@media(max-width:1024px){.hero-grid{gap:48px}}@media(max-width:768px){.container{padding:0 16px}.hero{padding:100px 0 60px;min-height:auto}.hero-grid{grid-template-columns:1fr;gap:40px}.hero-subtitle{font-size:16px;max-width:100%}.hero-visual{animation:fadeUp 1s ease-out .2s both}.hero-glow{width:400px;height:400px;top:-10%;right:-20%}.terminal-body{min-height:220px;max-height:300px;font-size:12px}.footer-grid{grid-template-columns:1fr;gap:40px}.footer-links{grid-template-columns:repeat(3,1fr);gap:24px}.footer{padding:40px 0 24px}.mobile-header{display:flex}.sidebar-overlay.active{display:block}.sidebar{position:fixed;inset:0 auto 0 0;transform:translate(-100%);transition:transform .3s ease;height:100vh;z-index:90}.sidebar.open{transform:translate(0)}.app-layout{flex-direction:column}.dashboard-main:has(.welcome-page){display:block}.main-content{padding:20px 16px}.courses-grid{grid-template-columns:1fr}.course-detail-title{font-size:26px}.admin-form-grid,.admin-course-grid{grid-template-columns:1fr}}@media(max-width:480px){.navbar{padding:12px 0}.btn{padding:8px 14px;font-size:13px}.btn-action{width:100%;justify-content:center;padding:14px 20px;font-size:14px}.hero-title{font-size:30px}.auth-card{padding:28px 20px}.auth-title{font-size:22px}.footer-links{grid-template-columns:repeat(2,1fr)}.footer-desc{max-width:100%}.welcome-page h1{font-size:28px}.admin-page{padding:24px 16px}.admin-title{font-size:26px}.dashboard-welcome h1{font-size:28px}.lesson-title,.course-detail-title{font-size:22px}}