:root{--bg: #F4F1EB;--bg-card: #FFFFFF;--bg-card-hover: #FAFAF8;--bg-sidebar: #0B1622;--bg-sidebar-hover: #13202F;--bg-sidebar-active: #1A2B3D;--primary: #00796B;--primary-light: #E0F2F1;--primary-lighter: #F0FAF9;--primary-dark: #004D40;--primary-glow: rgba(0, 121, 107, .15);--accent: #FF8F00;--accent-light: #FFF3E0;--accent-glow: rgba(255, 143, 0, .12);--indigo: #3949AB;--indigo-light: #E8EAF6;--danger: #C62828;--danger-light: #FFEBEE;--success: #2E7D32;--success-light: #E8F5E9;--text: #1A1A2E;--text-secondary: #6B7280;--text-muted: #9CA3AF;--text-on-dark: #D4D4D8;--text-on-dark-bright: #F4F4F5;--border: #E5E2DB;--border-light: #F0EDE7;--shadow-xs: 0 1px 2px rgba(0, 0, 0, .04);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 30px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 50px rgba(0, 0, 0, .12);--radius-sm: 8px;--radius: 12px;--radius-lg: 16px;--radius-xl: 20px;--sidebar-w: 260px;--font: "Rubik", -apple-system, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--transition: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .35s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;overflow:hidden}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}input,select{font-family:inherit}ul,ol{list-style:none}.app-layout{display:flex;height:100vh;overflow:hidden}.main-content{flex:1;overflow-y:auto;overflow-x:hidden;padding:32px 40px;margin-right:var(--sidebar-w);background:var(--bg);scroll-behavior:smooth}.main-content::-webkit-scrollbar{width:6px}.main-content::-webkit-scrollbar-track{background:transparent}.main-content::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.main-content::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.sidebar{position:fixed;right:0;top:0;bottom:0;width:var(--sidebar-w);background:var(--bg-sidebar);background-image:repeating-linear-gradient(-45deg,transparent,transparent 20px,rgba(255,255,255,.008) 20px,rgba(255,255,255,.008) 40px);display:flex;flex-direction:column;z-index:100;border-left:1px solid rgba(255,255,255,.06)}.sidebar-logo{padding:28px 24px 24px;display:flex;align-items:center;gap:14px;border-bottom:1px solid rgba(255,255,255,.06)}.logo-icon{width:42px;height:42px;background:linear-gradient(135deg,var(--primary),#26A69A);border-radius:10px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.3rem;color:#fff;flex-shrink:0;box-shadow:0 4px 12px #00796b4d}.logo-text{font-size:1.1rem;font-weight:700;color:var(--text-on-dark-bright);letter-spacing:-.02em}.sidebar-nav{padding:16px 12px;display:flex;flex-direction:column;gap:4px}.sidebar-link{display:flex;align-items:center;gap:12px;padding:10px 14px;border-radius:var(--radius-sm);color:var(--text-on-dark);font-size:.9rem;font-weight:500;transition:var(--transition)}.sidebar-link:hover{background:var(--bg-sidebar-hover);color:var(--text-on-dark-bright)}.sidebar-link.active{background:var(--bg-sidebar-active);color:#fff}.sidebar-link.active:before{content:"";position:absolute;right:0;width:3px;height:24px;background:var(--primary);border-radius:0 3px 3px 0}.sidebar-link svg{width:20px;height:20px;opacity:.7;flex-shrink:0}.sidebar-link.active svg,.sidebar-link:hover svg{opacity:1}.sidebar-divider{margin:8px 20px;border-top:1px solid rgba(255,255,255,.06)}.sidebar-section-title{padding:12px 24px 8px;font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:#ffffff4d}.sidebar-courses{padding:0 12px;display:flex;flex-direction:column;gap:2px;flex:1;overflow-y:auto}.sidebar-course-link{display:flex;align-items:center;gap:10px;padding:8px 14px;border-radius:var(--radius-sm);color:var(--text-on-dark);font-size:.85rem;transition:var(--transition)}.sidebar-course-link:hover{background:var(--bg-sidebar-hover);color:var(--text-on-dark-bright)}.sidebar-course-link.active{background:var(--bg-sidebar-active);color:#fff}.sidebar-course-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.page-header{margin-bottom:32px}.page-header h1{font-size:1.75rem;font-weight:800;color:var(--text);letter-spacing:-.02em;line-height:1.2}.page-header .subtitle{font-size:.95rem;color:var(--text-secondary);margin-top:6px}.breadcrumb{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--text-secondary);margin-bottom:8px}.breadcrumb a{color:var(--primary);font-weight:500;transition:var(--transition)}.breadcrumb a:hover{color:var(--primary-dark)}.breadcrumb .sep{opacity:.4}.card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:24px;transition:var(--transition)}.card:hover{box-shadow:var(--shadow-md);border-color:var(--border-light)}.card-clickable{cursor:pointer}.card-clickable:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.stats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-bottom:32px}.stat-card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:20px;display:flex;flex-direction:column}.stat-card .stat-label{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-secondary);margin-bottom:6px}.stat-card .stat-value{font-size:1.75rem;font-weight:800;font-family:var(--font-mono);color:var(--text);letter-spacing:-.03em}.stat-card .stat-value span{font-size:.9rem;font-weight:500;color:var(--text-secondary);font-family:var(--font);margin-right:4px}.dashboard-grid{display:grid;grid-template-columns:1fr 340px;gap:24px}.dashboard-welcome{margin-bottom:24px}.dashboard-welcome h1{font-size:1.5rem;font-weight:700}.dashboard-welcome .date{font-size:.95rem;color:var(--text-secondary);margin-top:4px}.start-date-section{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:20px;margin-bottom:24px}.start-date-section h3{font-size:.95rem;font-weight:700;margin-bottom:16px}.start-date-row{display:flex;align-items:center;gap:12px;margin-bottom:10px}.start-date-row label{font-size:.85rem;font-weight:500;min-width:100px}.start-date-row input[type=date]{padding:6px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.85rem;background:var(--bg);direction:ltr}.start-date-row input[type=date]:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow)}.calendar{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:24px}.calendar-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.calendar-header h3{font-size:1.05rem;font-weight:700}.calendar-nav-btn{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:var(--transition);font-size:1rem}.calendar-nav-btn:hover{background:var(--primary-light);color:var(--primary)}.calendar-weekdays{display:grid;grid-template-columns:repeat(7,1fr);gap:2px;margin-bottom:8px;direction:ltr}.calendar-weekdays div{text-align:center;font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);padding:4px}.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:2px;direction:ltr}.calendar-cell{aspect-ratio:1;display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:8px;font-size:.85rem;font-weight:500;color:var(--text);position:relative;transition:var(--transition);cursor:default;gap:3px}.calendar-cell.empty{color:transparent;pointer-events:none}.calendar-cell.today{background:var(--primary-light);color:var(--primary-dark);font-weight:700}.calendar-cell.has-study{cursor:pointer;font-weight:600}.calendar-cell.has-study:hover{background:var(--primary-lighter);transform:scale(1.08)}.calendar-cell.other-month{opacity:.3}.calendar-dots{display:flex;gap:3px}.calendar-dot{width:5px;height:5px;border-radius:50%}.today-tasks{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:24px;max-height:600px;overflow-y:auto}.today-tasks h3{font-size:.95rem;font-weight:700;margin-bottom:16px}.today-task-course{margin-bottom:20px}.today-task-course-name{font-size:.8rem;font-weight:600;color:var(--primary);margin-bottom:8px;display:flex;align-items:center;gap:8px}.today-task-day{font-size:.85rem;color:var(--text);padding:10px 14px;background:var(--primary-lighter);border-radius:var(--radius-sm);border-right:3px solid var(--primary);cursor:pointer;transition:var(--transition)}.today-task-day:hover{background:var(--primary-light)}.today-task-day .day-title{font-weight:600;margin-bottom:2px}.today-task-day .day-meta{font-size:.75rem;color:var(--text-secondary)}.no-tasks-msg{color:var(--text-muted);font-size:.85rem;text-align:center;padding:32px 16px}.courses-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px}.course-card{background:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border);padding:28px;cursor:pointer;transition:var(--transition);position:relative;overflow:hidden}.course-card:before{content:"";position:absolute;top:0;right:0;left:0;height:4px}.course-card.color-0:before{background:linear-gradient(90deg,var(--primary),#26A69A)}.course-card.color-1:before{background:linear-gradient(90deg,var(--indigo),#5C6BC0)}.course-card.color-2:before{background:linear-gradient(90deg,var(--accent),#FFB74D)}.course-card.color-3:before{background:linear-gradient(90deg,#c62828,#ef5350)}.course-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--border-light)}.course-card-header{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:20px}.course-card-name{font-size:1.2rem;font-weight:700;line-height:1.3;letter-spacing:-.01em}.course-card-progress-ring{flex-shrink:0}.progress-ring-circle-bg{stroke:var(--border-light)}.progress-ring-circle{transition:stroke-dashoffset .6s cubic-bezier(.4,0,.2,1);transform:rotate(-90deg);transform-origin:50% 50%}.progress-ring-text{font-family:var(--font-mono);font-weight:700;font-size:11px;fill:var(--text)}.course-card-stats{display:flex;gap:20px}.course-card-stat{display:flex;flex-direction:column}.course-card-stat-value{font-family:var(--font-mono);font-weight:700;font-size:1.1rem;color:var(--text)}.course-card-stat-label{font-size:.7rem;color:var(--text-muted);font-weight:500}.course-card-bar{margin-top:20px;height:6px;background:var(--border-light);border-radius:3px;overflow:hidden}.course-card-bar-fill{height:100%;border-radius:3px;transition:width .6s cubic-bezier(.4,0,.2,1)}.color-0 .course-card-bar-fill{background:linear-gradient(90deg,var(--primary),#26A69A)}.color-1 .course-card-bar-fill{background:linear-gradient(90deg,var(--indigo),#5C6BC0)}.course-detail-stats{display:flex;gap:24px;margin-bottom:32px;flex-wrap:wrap}.course-detail-stat{font-size:.85rem;color:var(--text-secondary)}.course-detail-stat strong{font-family:var(--font-mono);color:var(--text);font-weight:700}.days-timeline{position:relative}.days-timeline:before{content:"";position:absolute;right:19px;top:0;bottom:0;width:2px;background:var(--border)}.day-timeline-item{position:relative;padding-right:48px;padding-bottom:16px}.day-timeline-dot{position:absolute;right:12px;top:18px;width:16px;height:16px;border-radius:50%;border:2px solid var(--border);background:var(--bg);z-index:1;transition:var(--transition)}.day-timeline-item.completed .day-timeline-dot{background:var(--primary);border-color:var(--primary)}.day-timeline-item.completed .day-timeline-dot:after{content:"";position:absolute;top:3px;right:3px;width:6px;height:6px;background:#fff;border-radius:50%}.day-timeline-card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:18px 22px;cursor:pointer;transition:var(--transition);display:flex;align-items:center;justify-content:space-between;gap:16px}.day-timeline-card:hover{border-color:var(--primary);box-shadow:var(--shadow-sm);transform:translate(-4px)}.day-timeline-info{flex:1;min-width:0}.day-timeline-number{font-family:var(--font-mono);font-size:.7rem;font-weight:600;color:var(--primary);margin-bottom:2px}.day-timeline-title{font-size:.95rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.day-timeline-meta{display:flex;gap:12px;margin-top:4px}.day-timeline-meta span{font-size:.75rem;color:var(--text-muted);display:flex;align-items:center;gap:4px}.day-timeline-badges{display:flex;gap:6px;flex-shrink:0}.badge{padding:3px 8px;border-radius:6px;font-size:.65rem;font-weight:600;text-transform:uppercase;letter-spacing:.03em}.badge-quiz{background:var(--accent-light);color:var(--accent)}.badge-podcast{background:var(--indigo-light);color:var(--indigo)}.badge-slides{background:var(--primary-light);color:var(--primary)}.day-timeline-arrow{color:var(--text-muted);font-size:1rem;transition:var(--transition)}.day-timeline-card:hover .day-timeline-arrow{color:var(--primary);transform:translate(-4px)}.day-detail-header{margin-bottom:32px}.day-detail-header h1{font-size:1.5rem;font-weight:800;margin-bottom:4px}.day-detail-meta{display:flex;gap:16px;align-items:center;flex-wrap:wrap}.day-detail-meta span{font-size:.85rem;color:var(--text-secondary);display:flex;align-items:center;gap:4px}.day-detail-progress{height:4px;background:var(--border-light);border-radius:2px;margin-top:16px;overflow:hidden}.day-detail-progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),#26A69A);border-radius:2px;transition:width .4s ease}.day-content-grid{display:grid;grid-template-columns:1fr 340px;gap:24px;align-items:start}.study-blocks{display:flex;flex-direction:column;gap:20px}.study-block{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:22px}.study-block h3{font-size:.95rem;font-weight:700;margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--border-light)}.task-item{display:flex;align-items:flex-start;gap:12px;padding:8px 0;cursor:pointer;transition:var(--transition)}.task-item:hover{opacity:.85}.task-checkbox{-moz-appearance:none;appearance:none;-webkit-appearance:none;width:20px;height:20px;border:2px solid var(--border);border-radius:6px;flex-shrink:0;margin-top:1px;cursor:pointer;transition:var(--transition);position:relative}.task-checkbox:checked{background:var(--primary);border-color:var(--primary)}.task-checkbox:checked:after{content:"";position:absolute;top:3px;right:2px;width:10px;height:6px;border-left:2px solid white;border-bottom:2px solid white;transform:rotate(-45deg)}.task-checkbox:hover{border-color:var(--primary)}.task-text{font-size:.9rem;line-height:1.5;transition:var(--transition)}.task-item.checked .task-text{text-decoration:line-through;opacity:.5}.task-row{display:flex;align-items:center;gap:8px}.task-row .task-item{flex:1;min-width:0}.task-file-link{display:inline-flex;align-items:center;gap:4px;padding:4px 10px;font-size:.75rem;font-weight:600;color:var(--primary);background:transparent;border:1.5px solid var(--primary);border-radius:6px;cursor:pointer;white-space:nowrap;flex-shrink:0;transition:var(--transition)}.task-file-link:hover{background:var(--primary);color:#fff}.task-item.checked+.task-file-link{opacity:.4}.resources-panel{display:flex;flex-direction:column;gap:16px;position:sticky;top:20px}.audio-player{background:var(--bg-sidebar);border-radius:var(--radius);padding:18px;color:#fff}.audio-player-label{font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:#ffffff80;margin-bottom:10px}.audio-player audio{width:100%;height:36px;border-radius:8px}.file-list-card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:20px}.file-list-card h4{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);margin-bottom:12px}.file-item{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);margin:0 -10px}.file-item:hover{background:var(--primary-lighter)}.file-icon{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:700;text-transform:uppercase;flex-shrink:0}.file-icon.pdf{background:#ffebee;color:#c62828}.file-icon.mp3{background:var(--indigo-light);color:var(--indigo)}.file-icon.slides{background:var(--primary-light);color:var(--primary)}.file-icon.other{background:var(--bg);color:var(--text-secondary)}.file-name{font-size:.82rem;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}.notes-section{background:var(--accent-light);border-radius:var(--radius);border:1px solid rgba(255,143,0,.15);padding:20px;margin-top:24px}.notes-section h3{font-size:.85rem;font-weight:700;color:var(--accent);margin-bottom:12px}.notes-section li{font-size:.85rem;color:var(--text);padding:4px 16px 4px 0;position:relative;line-height:1.6}.notes-section li:before{content:"";position:absolute;right:0;top:12px;width:6px;height:6px;background:var(--accent);border-radius:50%}.quiz-section{margin-top:32px}.quiz-section h2{font-size:1.15rem;font-weight:700;margin-bottom:20px;display:flex;align-items:center;gap:10px}.quiz-question{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:24px;margin-bottom:16px;transition:var(--transition)}.quiz-question-header{display:flex;align-items:center;gap:12px;margin-bottom:14px}.quiz-question-num{font-family:var(--font-mono);font-size:.7rem;font-weight:700;color:var(--primary);background:var(--primary-light);padding:3px 8px;border-radius:6px}.quiz-question-text{font-size:.95rem;font-weight:500;margin-bottom:16px;line-height:1.7}.katex,.katex-display{direction:ltr;unicode-bidi:isolate}.quiz-options{display:flex;flex-direction:column;gap:8px}.quiz-option{display:flex;align-items:center;gap:12px;padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.88rem;text-align:right;transition:var(--transition);cursor:pointer;background:var(--bg-card);line-height:1.5}.quiz-option:hover:not(.revealed){border-color:var(--primary);background:var(--primary-lighter)}.quiz-option.correct{border-color:var(--success);background:var(--success-light);color:var(--success);font-weight:600}.quiz-option.incorrect{border-color:var(--danger);background:var(--danger-light);color:var(--danger)}.quiz-option.dimmed{opacity:.5}.quiz-option-marker{width:22px;height:22px;border:2px solid var(--border);border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:.7rem;transition:var(--transition)}.quiz-option.correct .quiz-option-marker{border-color:var(--success);background:var(--success);color:#fff}.quiz-option.incorrect .quiz-option-marker{border-color:var(--danger);background:var(--danger);color:#fff}.quiz-hint-toggle{margin-top:10px;font-size:.8rem;color:var(--accent);font-weight:600;cursor:pointer;padding:4px 0}.quiz-hint-toggle:hover{text-decoration:underline}.quiz-hint-text{margin-top:8px;font-size:.85rem;color:var(--text-secondary);padding:10px 14px;background:var(--accent-light);border-radius:var(--radius-sm);border-right:3px solid var(--accent);line-height:1.6}.quiz-score{background:var(--primary-light);border-radius:var(--radius);padding:20px;text-align:center;margin-top:20px}.quiz-score-value{font-family:var(--font-mono);font-size:2rem;font-weight:800;color:var(--primary-dark)}.quiz-score-label{font-size:.85rem;color:var(--primary);margin-top:4px}.pdf-modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;display:flex;align-items:center;justify-content:center;padding:24px;animation:fadeIn .2s ease}.pdf-modal{width:100%;max-width:900px;height:85vh;background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-xl);display:flex;flex-direction:column;animation:slideUp .25s ease}.pdf-modal-header{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--border);background:var(--bg)}.pdf-modal-title{font-size:.9rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pdf-modal-close{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;color:var(--text-secondary);transition:var(--transition)}.pdf-modal-close:hover{background:var(--danger-light);color:var(--danger)}.pdf-modal iframe{flex:1;width:100%;border:none}.day-nav{display:flex;justify-content:space-between;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}.day-nav-btn{display:flex;align-items:center;gap:8px;padding:10px 18px;border-radius:var(--radius-sm);background:var(--bg-card);border:1px solid var(--border);font-size:.85rem;font-weight:500;color:var(--text);transition:var(--transition)}.day-nav-btn:hover{border-color:var(--primary);color:var(--primary)}.day-nav-btn.disabled{opacity:.3;pointer-events:none}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes slideRight{0%{transform:translate(20px);opacity:0}to{transform:translate(0);opacity:1}}.animate-in{animation:slideRight .3s ease both}.animate-in:nth-child(1){animation-delay:0s}.animate-in:nth-child(2){animation-delay:.04s}.animate-in:nth-child(3){animation-delay:.08s}.animate-in:nth-child(4){animation-delay:.12s}.animate-in:nth-child(5){animation-delay:.16s}.animate-in:nth-child(6){animation-delay:.2s}.animate-in:nth-child(7){animation-delay:.24s}.animate-in:nth-child(8){animation-delay:.28s}.animate-in:nth-child(9){animation-delay:.32s}.animate-in:nth-child(10){animation-delay:.36s}.loading{display:flex;align-items:center;justify-content:center;padding:64px;color:var(--text-muted)}.loading-spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{text-align:center;padding:64px 24px;color:var(--text-muted)}.empty-state-icon{font-size:2.5rem;margin-bottom:12px;opacity:.5}@media(max-width:1024px){.dashboard-grid,.day-content-grid{grid-template-columns:1fr}.resources-panel{position:static}}@media(max-width:768px){.sidebar{display:none}.main-content{margin-right:0;padding:20px}.courses-grid{grid-template-columns:1fr}.stats-row{grid-template-columns:1fr 1fr}}.chat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden;margin:24px 0 32px;display:flex;flex-direction:column}.chat-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 18px;background:linear-gradient(135deg,var(--primary-lighter),var(--bg-card));border-bottom:1px solid var(--border-light)}.chat-title{display:flex;align-items:center;gap:8px;font-weight:600;color:var(--primary-dark)}.chat-dot{width:9px;height:9px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 4px var(--primary-glow)}.chat-sub{font-size:12px;color:var(--text-muted)}.chat-scroll{padding:18px;max-height:460px;min-height:180px;overflow-y:auto;display:flex;flex-direction:column;gap:14px;background:radial-gradient(circle at 100% 0%,var(--primary-glow),transparent 60%),var(--bg-card)}.chat-empty{color:var(--text-secondary);font-size:14px;line-height:1.6}.chat-empty p{margin-bottom:12px}.chat-starters{display:flex;flex-wrap:wrap;gap:8px}.chat-starter{border:1px solid var(--border);background:var(--bg-card-hover);color:var(--text);border-radius:999px;padding:7px 14px;font-size:13px;font-family:var(--font);cursor:pointer;transition:all var(--transition)}.chat-starter:hover{border-color:var(--primary);color:var(--primary-dark);background:var(--primary-lighter)}.chat-msg{display:flex;flex-direction:column;gap:6px;max-width:88%}.chat-msg-user{align-self:flex-end;align-items:flex-end}.chat-msg-assistant{align-self:flex-start;align-items:flex-start}.chat-bubble{padding:11px 15px;border-radius:var(--radius);font-size:14.5px;line-height:1.65;white-space:pre-wrap;word-break:break-word}.chat-msg-user .chat-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:4px}.chat-msg-assistant .chat-bubble{background:var(--bg);color:var(--text);border:1px solid var(--border-light);border-bottom-left-radius:4px}.chat-bubble-warn{background:var(--accent-light)!important;color:var(--primary-dark)}.chat-bubble-degraded{border-color:var(--accent)!important}.chat-md-p{margin:0 0 6px}.chat-md-p:last-child{margin-bottom:0}.chat-md-h{margin:9px 0 4px;font-weight:700;color:var(--primary-dark)}.chat-md-list{margin:4px 0 8px;padding-inline-start:22px;display:flex;flex-direction:column;gap:3px}.chat-md-list li{line-height:1.6}.chat-md-space{height:5px}.chat-bubble code{font-family:var(--font-mono);font-size:.9em;background:#0000000f;padding:1px 5px;border-radius:5px}.chat-sources{display:flex;flex-wrap:wrap;align-items:center;gap:7px;padding:0 2px}.chat-sources-label{font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--text-muted)}.chat-source{display:inline-block;max-width:320px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px;color:var(--indigo);background:var(--indigo-light);border:1px solid transparent;border-radius:var(--radius-sm);padding:4px 9px;text-decoration:none;transition:all var(--transition)}.chat-source:hover{border-color:var(--indigo);background:#fff}.chat-typing{display:flex;gap:5px;align-items:center}.chat-typing span{width:7px;height:7px;border-radius:50%;background:var(--text-muted);animation:chatBlink 1.2s infinite ease-in-out both}.chat-typing span:nth-child(2){animation-delay:.18s}.chat-typing span:nth-child(3){animation-delay:.36s}@keyframes chatBlink{0%,80%,to{opacity:.25;transform:translateY(0)}40%{opacity:1;transform:translateY(-3px)}}.chat-error{margin:0 18px;padding:8px 12px;font-size:13px;color:var(--danger);background:var(--danger-light);border-radius:var(--radius-sm)}.chat-att-tray{display:flex;flex-wrap:wrap;gap:8px;padding:10px 18px 0}.chat-msg-atts{display:flex;flex-wrap:wrap;gap:6px}.chat-msg-user .chat-msg-atts{justify-content:flex-end}.chat-att{position:relative;display:inline-flex;align-items:center;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-card-hover);overflow:hidden;max-width:220px}.chat-att-thumb{display:block;width:72px;height:72px;object-fit:cover}.chat-att-file{padding:8px 12px;font-size:12.5px;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:200px}.chat-att-x{position:absolute;top:2px;inset-inline-end:2px;width:18px;height:18px;line-height:15px;text-align:center;padding:0;border:none;border-radius:50%;cursor:pointer;background:#0000008c;color:#fff;font-size:14px}.chat-att-x:hover{background:#000c}.chat-att-notes{font-size:12px;color:var(--accent);padding:0 2px}.chat-attach-btn{flex:none;width:42px;border:1px solid var(--border);background:var(--bg);border-radius:var(--radius);font-size:18px;cursor:pointer;color:var(--text-secondary);transition:all var(--transition)}.chat-attach-btn:hover:not(:disabled){border-color:var(--primary);color:var(--primary-dark);background:var(--primary-lighter)}.chat-attach-btn:disabled{opacity:.5;cursor:default}.chat-input-row{display:flex;gap:10px;padding:14px 18px;border-top:1px solid var(--border-light);background:var(--bg-card)}.chat-input{flex:1;border:1px solid var(--border);border-radius:var(--radius);padding:11px 14px;font-size:14.5px;font-family:var(--font);color:var(--text);background:var(--bg);outline:none;transition:border-color var(--transition),box-shadow var(--transition)}.chat-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow)}.chat-input:disabled{opacity:.6}.chat-send{border:none;background:var(--primary);color:#fff;font-weight:600;font-family:var(--font);font-size:14.5px;padding:0 22px;border-radius:var(--radius);cursor:pointer;transition:background var(--transition),transform var(--transition)}.chat-send:hover:not(:disabled){background:var(--primary-dark)}.chat-send:active:not(:disabled){transform:translateY(1px)}.chat-send:disabled{opacity:.5;cursor:default}.library{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);margin-bottom:24px;overflow:hidden}.library-toggle{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 18px;background:none;border:none;cursor:pointer;font:inherit;font-weight:600;color:var(--text);direction:rtl}.library-toggle:hover{background:var(--bg-card-hover)}.library-chevron{color:var(--text-muted);font-size:12px}.library-body{border-top:1px solid var(--border-light);padding:8px 0;max-height:460px;overflow-y:auto;direction:rtl}.library-empty{padding:14px 18px;color:var(--text-secondary)}.library-section+.library-section{border-top:1px solid var(--border-light)}.library-section-head{width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 18px;background:none;border:none;cursor:pointer;font:inherit;color:var(--text);text-align:right}.library-section-head:hover{background:var(--primary-lighter)}.library-count{background:var(--primary-light);color:var(--primary-dark);border-radius:999px;padding:1px 9px;font-size:12px;font-weight:600}.library-files{list-style:none;margin:0;padding:0 8px 8px}.library-files a{display:flex;align-items:center;gap:10px;padding:7px 12px;border-radius:var(--radius-sm);color:var(--text);text-decoration:none;font-size:14px}.library-files a:hover{background:var(--bg-card-hover);color:var(--primary-dark)}.library-ext{flex:0 0 auto;min-width:34px;text-align:center;font-size:10px;font-weight:700;letter-spacing:.03em;color:var(--text-secondary);background:var(--border-light);border-radius:4px;padding:2px 4px}.library-name{flex:1 1 auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.library-meta{flex:0 0 auto;color:var(--text-muted);font-size:12px}.library-scanned{flex:0 0 auto;font-size:11px;color:var(--accent);background:var(--accent-light);border-radius:4px;padding:1px 6px}.recordings .library-body{max-height:none}.rec-body{padding:0}.rec-stats{display:flex;gap:22px;padding:16px 20px 12px;border-bottom:1px solid var(--border-light);direction:rtl}.rec-stat{font-size:13px;color:var(--text-secondary)}.rec-stat strong{display:block;font-size:22px;font-weight:700;color:var(--primary-dark);line-height:1.2}.rec-tabs{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:12px 20px;border-bottom:1px solid var(--border-light);direction:rtl}.rec-tab{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border:1px solid var(--border);border-radius:999px;background:var(--bg-card);cursor:pointer;font:inherit;font-size:13px;font-weight:500;color:var(--text-secondary);transition:var(--transition)}.rec-tab:hover{border-color:var(--primary);color:var(--primary-dark)}.rec-tab.active{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}.rec-search{flex:1;min-width:160px;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font:inherit;font-size:13px;direction:rtl;background:var(--bg-card);color:var(--text)}.rec-search:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow)}.rec-card{border-bottom:1px solid var(--border-light)}.rec-card.open{background:var(--primary-lighter)}.rec-card-head{width:100%;display:flex;align-items:center;gap:12px;padding:13px 20px;background:none;border:none;cursor:pointer;font:inherit;color:var(--text);text-align:right;direction:rtl}.rec-card-head:hover{background:var(--bg-card-hover)}.rec-num{flex:0 0 auto;width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:var(--primary-light);color:var(--primary-dark);font-size:13px;font-weight:700;font-family:var(--font-mono)}.rec-card-title{flex:1;font-weight:600;font-size:14px;line-height:1.4}.rec-card-meta{display:block;font-size:12px;font-weight:400;color:var(--text-muted);margin-top:2px}.rec-chevron{color:var(--text-muted);font-size:11px}.rec-badge{font-size:10px;font-weight:700;border-radius:999px;padding:3px 9px;text-transform:uppercase;letter-spacing:.03em}.rec-zoom{background:var(--indigo-light);color:var(--indigo)}.rec-panopto{background:var(--accent-light);color:#b45309}.rec-direct{background:var(--border-light);color:var(--text-secondary)}.rec-card-body{padding:4px 20px 22px;direction:rtl}.rec-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:6px 0 18px}.rec-link{display:inline-flex;align-items:center;gap:6px;padding:8px 15px;border-radius:var(--radius-sm);background:var(--primary);color:#fff;text-decoration:none;font-size:13px;font-weight:600;transition:var(--transition)}.rec-link:hover{background:var(--primary-dark)}.rec-link-muted{background:var(--bg-card);color:var(--text-secondary);border:1px solid var(--border);font-weight:500}.rec-link-muted:hover{background:var(--bg-card-hover);color:var(--primary-dark)}.rec-pass{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border:1px dashed var(--border);border-radius:var(--radius-sm);background:var(--bg-card);cursor:pointer;font:inherit;font-size:13px;color:var(--text-secondary)}.rec-pass:hover{border-color:var(--primary);color:var(--primary-dark)}.rec-pass code{font-family:var(--font-mono);color:var(--text);font-weight:600}.rec-intro{font-size:14px;line-height:1.7;color:var(--text-secondary);padding:0 0 14px;border-bottom:1px solid var(--border-light);margin-bottom:4px}.rec-sec{margin-top:18px;font-size:14px;line-height:1.75}.rec-sec h4{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:700;color:var(--primary-dark);margin-bottom:8px}.rec-sec-icon{font-size:15px}.rec-sub{font-size:14px;font-weight:600;margin:14px 0 4px;color:var(--text)}.rec-sec p{margin:6px 0}.rec-sec code,.rec-intro code,.rec-formula code,.rec-digest code,.rec-tips code{background:var(--primary-light);color:var(--primary-dark);border-radius:4px;padding:1px 5px;font-family:var(--font-mono);font-size:12.5px;direction:ltr;unicode-bidi:isolate}.rec-list{margin:6px 0;padding-inline-start:22px}.rec-list li{margin:4px 0}.rec-sec-tips{background:var(--accent-light);border-inline-start:3px solid var(--accent);border-radius:var(--radius-sm);padding:14px 16px}.rec-sec-tips h4{color:#b45309}.rec-tips{list-style:none;margin:0;padding:0}.rec-tips li{position:relative;padding-inline-start:20px;margin:8px 0}.rec-tips li:before{content:"▸";position:absolute;inset-inline-start:0;color:var(--accent);font-weight:700}.rec-sec-formulas{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px}.rec-formulas{display:flex;flex-direction:column;gap:6px}.rec-formula{background:var(--primary-lighter);border:1px solid var(--border-light);border-radius:var(--radius-sm);padding:7px 12px;font-size:13.5px;direction:rtl}.rec-formula code{background:none;padding:0;font-size:13.5px;color:var(--text);direction:ltr;unicode-bidi:isolate}.rec-timeline{list-style:none;margin:0;padding:0}.rec-timeline li{display:flex;gap:12px;align-items:baseline;padding:5px 0;border-bottom:1px dashed var(--border-light)}.rec-timeline li:last-child{border-bottom:none}.rec-at{flex:0 0 auto;min-width:52px;font-family:var(--font-mono);font-size:12px;font-weight:600;color:var(--primary);background:var(--primary-light);border-radius:4px;padding:2px 7px;text-align:center}.rec-empty{color:var(--text-secondary);font-size:14px;padding:10px 0}.rec-digest{padding:6px 20px 20px;direction:rtl}.rec-digest-group{margin-top:18px}.rec-digest-head{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:600;color:var(--text-secondary);padding-bottom:8px;margin-bottom:8px;border-bottom:1px solid var(--border-light)}.rec-digest-group .rec-tips li{font-size:14px;line-height:1.7}.rec-digest-group code{background:var(--primary-light);color:var(--primary-dark);border-radius:4px;padding:1px 5px;font-family:var(--font-mono);font-size:12.5px}.rec-others{border-top:1px solid var(--border-light)}.rec-others-head{width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 20px;background:none;border:none;cursor:pointer;font:inherit;font-size:13px;color:var(--text-secondary);text-align:right;direction:rtl}.rec-others-head:hover{background:var(--bg-card-hover);color:var(--text)}.rec-others-list{list-style:none;margin:0;padding:0 20px 14px;direction:rtl}.rec-others-list li{display:flex;align-items:center;gap:8px;padding:4px 0}.rec-others-list a{color:var(--text);text-decoration:none;font-size:13px}.rec-others-list a:hover{color:var(--primary-dark);text-decoration:underline}.rec-others-pass{background:var(--border-light);border-radius:4px;padding:1px 6px;font-family:var(--font-mono);font-size:12px;color:var(--text-secondary)}.lecture-page{direction:rtl}.lecture-meta{display:flex;align-items:center;gap:12px;margin-top:8px;font-size:13px;color:var(--text-secondary)}.lecture-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:18px 0}.rec-link-page{background:var(--indigo)}.rec-link-page:hover{background:#2a3690}.lecture-tabs{display:flex;gap:8px;flex-wrap:wrap;border-bottom:2px solid var(--border);margin-bottom:22px}.lecture-tab{position:relative;display:inline-flex;align-items:center;gap:7px;padding:11px 20px;border:none;border-bottom:3px solid transparent;margin-bottom:-2px;background:none;cursor:pointer;font:inherit;font-size:14px;font-weight:600;color:var(--text-secondary);transition:var(--transition)}.lecture-tab:hover{color:var(--primary-dark)}.lecture-tab.active{color:var(--primary-dark);border-bottom-color:var(--primary)}.tab-dot{width:7px;height:7px;border-radius:50%;background:var(--accent)}.lecture-card{padding:24px 26px}.lecture-body{min-height:300px}.lecture-nav{display:flex;justify-content:space-between;gap:12px;margin:28px 0 10px}.ex-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-bottom:14px;margin-bottom:6px;border-bottom:1px solid var(--border-light);font-size:13px;color:var(--text-secondary)}.ex-toggle-all{padding:7px 14px;border:1px solid var(--border);border-radius:999px;background:var(--bg-card);cursor:pointer;font:inherit;font-size:13px;color:var(--text-secondary);transition:var(--transition)}.ex-toggle-all:hover{border-color:var(--primary);color:var(--primary-dark)}.ex-card{padding:18px 0;border-bottom:1px solid var(--border-light)}.ex-card:last-child{border-bottom:none}.ex-head{display:flex;align-items:center;gap:12px;margin-bottom:10px}.ex-num{flex:0 0 auto;width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:var(--indigo-light);color:var(--indigo);font-family:var(--font-mono);font-size:13px;font-weight:700}.ex-title{flex:1;display:flex;align-items:center;gap:10px;font-size:15px;font-weight:600;color:var(--text)}.ex-level{font-size:11px;font-weight:700;border-radius:999px;padding:2px 10px}.ex-easy{background:var(--success-light);color:var(--success)}.ex-medium{background:var(--accent-light);color:#b45309}.ex-hard{background:var(--danger-light);color:var(--danger)}.ex-question{font-size:14px;line-height:1.8;color:var(--text);padding-inline-start:40px}.ex-question p{margin:6px 0}.ex-question code,.ex-solution code{background:var(--primary-light);color:var(--primary-dark);border-radius:4px;padding:1px 5px;font-family:var(--font-mono);font-size:12.5px;direction:ltr;unicode-bidi:isolate}.ex-toggle{margin:12px 0 0;margin-inline-start:40px;padding:7px 16px;border:1px solid var(--primary);border-radius:var(--radius-sm);background:var(--bg-card);color:var(--primary-dark);cursor:pointer;font:inherit;font-size:13px;font-weight:600;transition:var(--transition)}.ex-toggle:hover{background:var(--primary);color:#fff}.ex-solution{margin-top:12px;margin-inline-start:40px;padding:16px 18px;background:var(--primary-lighter);border-inline-start:3px solid var(--primary);border-radius:var(--radius-sm);font-size:14px;line-height:1.85}.ex-solution p{margin:6px 0}.ex-solution .rec-list{margin:6px 0;padding-inline-start:22px}@media(max-width:700px){.ex-question,.ex-toggle,.ex-solution{padding-inline-start:0;margin-inline-start:0}}