:root{--bg-dark: #0f172a;--bg-card: #1e293b;--primary: #6366f1;--primary-hover: #4f46e5;--text-main: #f8fafc;--text-dim: #94a3b8;--sidebar-w: 260px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-dark);color:var(--text-main);line-height:1.6;overflow-x:hidden}.landing-wrapper{min-height:100vh}.navbar{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 5%;background:#0f172ae6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);position:sticky;top:0;z-index:1000;border-bottom:1px solid #1e293b}.logo{font-size:1.5rem;font-weight:800;letter-spacing:-1px}.logo span,.highlight{color:var(--primary)}.nav-links{display:flex;list-style:none;gap:2rem;align-items:center}.nav-links a{text-decoration:none;color:var(--text-dim);font-weight:500;transition:.3s}.nav-links a:hover{color:var(--primary)}.login-btn{background:var(--primary);color:#fff;border:none;padding:.6rem 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#334155}.close-modal{position:absolute;top:1.5rem;right:1.5rem;background:#f43f5e;border:none;color:#fff;width:35px;height:35px;border-radius:50%;cursor:pointer;font-size:1.5rem;line-height:1}.html-render{margin-top:2rem;color:var(--text-main);line-height:1.8}.html-render h1,.html-render h2{color:var(--primary);margin:1rem 0}.html-render p{margin-bottom:1rem}.html-render code{background:#0f172a;padding:.2rem .4rem;border-radius:4px;color:#fbbf24}.nav-section-title{font-size:.75rem;color:var(--text-dim);font-weight:700;margin:1.5rem 0 .5rem 1rem;text-transform:uppercase;letter-spacing:1px}.no-courses-info{font-size:.85rem;color:var(--text-dim);padding-left:1rem;font-style:italic}.my-courses-list{display:flex;flex-direction:column;gap:4px}.side-nav a{display:flex;align-items:center;gap:10px;transition:all .2s ease}.side-nav a:hover{background:#6366f10d;padding-left:1.2rem}.sidebar-footer{padding-top:1rem;border-top:1px solid #30363d;margin-top:auto}.user-name-label{font-size:.85rem;color:var(--text-main);margin-bottom:.5rem;font-weight:600;text-align:center}.stat-card:hover{transform:translateY(-5px);border-color:var(--primary)}.stat-card p{color:var(--text-dim);font-size:.9rem;text-transform:uppercase;letter-spacing:1px;margin-bottom:.5rem}.admin-info-box{background:var(--bg-card);padding:2rem;border-radius:16px;border:1px solid #334155}.admin-table-container{-webkit-overflow-scrolling:touch;border:1px solid #334155!important;margin-bottom:2rem!important;width:100%;overflow-x:auto;background:#161b22;border-radius:12px;margin-top:1.5rem}.admin-table{width:100%;border-collapse:collapse;background:#161b22;border-radius:12px;overflow:hidden}.admin-table th,.admin-table td{text-align:left;border-bottom:1px solid #30363d;white-space:nowrap!important;padding:.8rem .5rem!important;font-size:.85rem!important}.admin-table 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#334155;border-radius:8px;color:#fff;padding:10px;font-family:inherit;resize:vertical}.quiz-admin-container .admin-table td{vertical-align:middle}.quiz-options-list{display:flex;flex-direction:column;gap:12px;margin:2rem 0}.quiz-option-btn{text-align:left;padding:1rem 1.5rem;background:#161b22;border:1px solid #30363d;border-radius:12px;color:#fff;cursor:pointer;transition:all .2s}.quiz-option-btn:hover{background:#1c2128;border-color:var(--primary)}.quiz-option-btn.selected{background:#6366f11a;border-color:var(--primary);box-shadow:0 0 0 1px var(--primary)}.quiz-navigation{display:flex;justify-content:space-between;padding-top:1rem;border-top:1px solid #30363d}.quiz-navigation button{padding:.6rem 1.5rem;background:#21262d;border:1px solid #30363d;border-radius:6px;color:#fff;cursor:pointer}.quiz-navigation button:disabled{opacity:.3;cursor:not-allowed}.quiz-question-text{font-size:1.2rem;line-height:1.5;margin-bottom:1.5rem}.timer-badge{background:#1e293b;padding:8px 15px;border-radius:8px;font-weight:700;font-family:monospace;font-size:1.2rem;border:1px solid #334155;color:#4ade80}.timer-badge.urgent{color:#f87171;border-color:#ef4444;animation:pulse 1s infinite}@keyframes pulse{0%{opacity:1}50%{opacity:.5}to{opacity:1}}.review-list{margin-top:1.5rem;display:flex;flex-direction:column;gap:1.5rem}.correct-border{border-left-color:#22c55e}.wrong-border{border-left-color:#ef4444}.review-options{margin-top:1rem;display:flex;flex-direction:column;gap:.5rem}.review-opt{padding:10px;border-radius:4px;background:#2d333b;font-size:.9rem}.opt-correct{background:#22c55e33!important;border:1px solid #22c55e;color:#4ade80}.opt-wrong{background:#ef444433!important;border:1px solid #ef4444;color:#f87171}.stat-card.locked{cursor:not-allowed;border-color:#334155;background:#0f172a;opacity:.8}.quiz-result-tag{margin-top:10px;padding:10px;background:#22c55e1a;border-radius:6px;color:#4ade80;font-size:.9rem}.status-completed{font-size:.75rem;text-transform:uppercase;font-weight:700;color:#22c55e}.stat-card.locked:hover{transform:none}.section-header-flex{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;gap:1rem}.quiz-admin-container .search-input{height:42px}.btn-small{padding:5px 10px;font-size:.75rem;background:var(--primary);border:none;border-radius:4px;color:#fff;cursor:pointer}.btn-small.btn-secondary{background:#475569}.btn-small:disabled{opacity:.5;cursor:not-allowed}.row-highlight-warning{background-color:#eab3081a!important;border-left:4px solid #eab308}.review-item{background:#1e293b;padding:20px;border-radius:12px;margin-bottom:20px;border:2px solid transparent;transition:transform .2s}.correct-border{border-color:#22c55e;background:#22c55e0d}.wrong-border{border-color:#ef4444;background:#ef44440d}.unanswered-border{border-color:#64748b;opacity:.8}.question-number{font-size:.8rem;color:#94a3b8;margin-bottom:5px;text-transform:uppercase;letter-spacing:1px}.question-text{font-size:1.1rem;margin-bottom:15px;line-height:1.4}.review-opt{padding:12px;border-radius:8px;background:#0f172a;margin-bottom:4px;border:1px solid #334155}.student-stats-section{margin-bottom:2rem}.progress-chart{display:flex;align-items:flex-end;gap:20px;height:200px;padding:20px 0;border-bottom:2px solid #334155;margin-top:1rem}.chart-column-wrapper{flex:1;display:flex;flex-direction:column;align-items:center;max-width:60px}.chart-bar{width:100%;border-radius:6px 6px 0 0;position:relative;transition:height 1s ease-out;display:flex;justify-content:center}.chart-bar.pass{background:linear-gradient(to top,#15803d,#22c55e)}.chart-bar.fail{background:linear-gradient(to top,#b91c1c,#ef4444)}.bar-value{position:absolute;top:-25px;font-size:.8rem;font-weight:700;color:#fff}.bar-label{margin-top:10px;font-size:.7rem;color:#94a3b8;white-space:nowrap}.student-stats-section{background:#1e293b;padding:20px;border-radius:12px;margin-bottom:2rem;border:1px solid #334155}.progress-chart{display:flex;align-items:flex-end;gap:25px;height:180px;padding:30px 10px 10px;background:#0f172a;border-radius:8px;margin-top:1rem;border-bottom:2px solid #334155}.chart-column-wrapper{flex:1;display:flex;flex-direction:column;align-items:center;max-width:50px;height:100%;justify-content:flex-end}.chart-bar{width:100%;border-radius:4px 4px 0 0;position:relative;transition:height .8s ease-out;min-height:2px}.chart-bar.pass{background:linear-gradient(to top,#15803d,#22c55e);box-shadow:0 0 10px #22c55e4d}.chart-bar.fail{background:linear-gradient(to top,#991b1b,#ef4444);box-shadow:0 0 10px #ef44444d}.bar-value{position:absolute;top:-25px;left:50%;transform:translate(-50%);font-size:.75rem;font-weight:700;color:#f8fafc}.bar-label{margin-top:10px;font-size:.7rem;color:#94a3b8;text-align:center;white-space:nowrap}.chart-bar:hover{filter:brightness(1.2);cursor:help}.sidebar-user-box{display:flex;align-items:center;gap:12px;padding:15px;background:#ffffff0d;border-radius:12px;margin-bottom:20px}.avatar-circle{width:40px;height:40px;border-radius:50%;object-fit:cover;border:2px solid var(--primary);background-color:#1e293b;display:flex;align-items:center;justify-content:center;font-size:1.2rem}.user-info-text{display:flex;flex-direction:column}.user-name-small{font-weight:600;font-size:.9rem;color:#fff}.quiz-image-wrapper img{cursor:zoom-in;transition:transform .2s}.quiz-image-wrapper img:hover{transform:scale(1.02)}.review-item img{cursor:pointer}.edit-question-box{background:#1c2128;padding:20px;border-radius:12px;border:1px solid var(--primary);margin-top:10px;display:flex;flex-direction:column;gap:15px}.edit-image-input{background:#0f172a!important;border:1px dashed var(--primary)!important;padding:12px!important;color:#4ade80!important;font-family:monospace;font-size:.85rem!important}.edit-image-input::placeholder{color:#475569}.quiz-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.5rem;margin-bottom:1rem}.form-field-group{display:flex;flex-direction:column;gap:5px}.form-field-group label{font-size:.75rem;font-weight:700;color:var(--primary);text-transform:uppercase;margin-bottom:2px}.edit-question-box .quiz-grid{gap:1rem;padding:10px 0}@media(max-width:768px){.dashboard{flex-direction:column!important;display:block!important;width:100vw!important;overflow-x:hidden!important}.sidebar{width:100%!important;height:auto!important;position:relative!important;padding:1rem!important;border-right:none!important;border-bottom:1px solid #30363d!important;left:0!important;margin-left:0!important}.sidebar-logo{margin-bottom:1rem!important;text-align:center}.side-nav{flex-direction:row!important;display:flex!important;overflow-x:auto!important;padding-bottom:10px!important;gap:10px!important;white-space:nowrap!important;width:100%!important}.side-nav a{padding:.5rem 1rem!important;font-size:.85rem!important}.main-content{margin-left:0!important;padding:1rem!important;width:100%!important;min-width:0!important;position:relative!important;left:0!important}.admin-table-container{width:100%!important;max-width:calc(100vw - 2rem)!important;overflow-x:auto!important;display:block!important;margin-left:0!important;margin-right:0!important}.stats-grid,.quiz-grid{grid-template-columns:1fr!important;width:100%!important}.admin-form-section{width:100%!important;padding:1rem!important;margin-left:0!important}.user-name-label,.nav-section-title{display:none!important}}