@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap";:root{--font-sans:"Inter", system-ui, -apple-system, sans-serif;--font-heading:"Outfit", sans-serif;--bg-deep:#09090b;--bg-surface:#18181b;--bg-card:#18181ba6;--bg-card-hover:#27272ad9;--border-color:#ffffff14;--border-hover:#7c3aed66;--text-primary:#f4f4f5;--text-secondary:#a1a1aa;--text-muted:#71717a;--color-primary:#7c3aed;--color-primary-light:#a78bfa;--color-secondary:#0891b2;--color-success:#10b981;--color-danger:#ef4444;--color-warning:#f59e0b;--grad-primary:linear-gradient(135deg, #7c3aed 0%, #6366f1 100%);--grad-accent:linear-gradient(135deg, #0891b2 0%, #3b82f6 100%);--grad-success:linear-gradient(135deg, #10b981 0%, #059669 100%);--grad-danger:linear-gradient(135deg, #ef4444 0%, #b91c1c 100%);--shadow-sm:0 1px 2px 0 #00000080;--shadow-md:0 8px 24px -4px #0006;--shadow-lg:0 16px 40px -8px #0009;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--transition:all .2s cubic-bezier(.4, 0, .2, 1)}.light-theme{--bg-deep:#fafafa;--bg-surface:#fff;--bg-card:#ffffffbf;--bg-card-hover:#f4f4f5e6;--border-color:#00000014;--border-hover:#6d28d966;--text-primary:#09090b;--text-secondary:#71717a;--text-muted:#a1a1aa;--color-primary:#6d28d9;--color-primary-light:#7c3aed;--color-secondary:#0369a1;--color-success:#059669;--color-danger:#dc2626;--color-warning:#d97706;--grad-primary:linear-gradient(135deg, #6d28d9 0%, #4f46e5 100%);--grad-accent:linear-gradient(135deg, #0369a1 0%, #2563eb 100%);--grad-success:linear-gradient(135deg, #059669 0%, #047857 100%);--grad-danger:linear-gradient(135deg, #dc2626 0%, #991b1b 100%);--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 12px -2px #00000014;--shadow-lg:0 12px 28px -6px #0000001f}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-deep);color:var(--text-primary);background-image:radial-gradient(at 0 0,#8b5cf60d 0,#0000 50%),radial-gradient(at 50% 100%,#06b6d408 0,#0000 50%);min-height:100vh;line-height:1.5;transition:background-color .2s,color .2s;overflow-x:hidden}#root{flex-direction:column;width:100%;min-height:100vh;display:flex}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-deep)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--color-primary)}.app-container{min-height:100vh;display:flex;position:relative}@media (width<=768px){.app-container{flex-direction:column}}.sidebar{background:var(--bg-surface);border-right:1px solid var(--border-color);z-index:10;flex-direction:column;flex-shrink:0;width:260px;height:100vh;padding:24px 16px;transition:background-color .2s,border-color .2s;display:flex;position:sticky;top:0}@media (width<=768px){.sidebar{border-right:none;border-bottom:1px solid var(--border-color);width:100%;height:auto;padding:16px;position:relative}}.logo-container{align-items:center;gap:12px;margin-bottom:32px;padding-left:8px;display:flex}.logo-text{font-family:var(--font-heading);background:var(--grad-accent);-webkit-text-fill-color:transparent;letter-spacing:-.5px;-webkit-background-clip:text;font-size:22px;font-weight:800}.logo-icon{background:var(--grad-primary);color:#fff;border-radius:8px;place-items:center;width:32px;height:32px;display:grid;box-shadow:0 4px 12px #8b5cf640}.nav-list{flex-direction:column;flex-grow:1;gap:8px;list-style:none;display:flex}@media (width<=768px){.nav-list{flex-direction:row;padding-bottom:8px;overflow-x:auto}}.nav-item-btn{border-radius:var(--radius-sm);width:100%;color:var(--text-secondary);font-family:var(--font-sans);cursor:pointer;text-align:left;transition:var(--transition);background:0 0;border:1px solid #0000;align-items:center;gap:12px;padding:10px 14px;font-size:14px;font-weight:500;display:flex}.nav-item-btn:hover{color:var(--text-primary);background:#7c3aed0a}.nav-item-btn.active{color:var(--text-primary);border-left:3px solid var(--color-primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:#7c3aed14;font-weight:600}@media (width<=768px){.nav-item-btn{white-space:nowrap;padding:8px 14px}}.light-theme .nav-item-btn:hover{background:#6d28d908}.light-theme .nav-item-btn.active{background:#6d28d90f}.theme-toggle-floating{background:var(--bg-surface);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;width:38px;height:38px;transition:var(--transition);box-shadow:var(--shadow-sm);z-index:100;border-radius:50%;place-items:center;display:grid;position:absolute;top:24px;right:24px}.theme-toggle-floating:hover{color:var(--text-primary);border-color:var(--border-hover);transform:scale(1.05)}.user-profile-summary{background:var(--bg-deep);border-radius:var(--radius-md);border:1px solid var(--border-color);transition:var(--transition);align-items:center;gap:12px;margin-top:auto;padding:12px;display:flex}@media (width<=768px){.user-profile-summary{display:none}}.avatar{background:var(--grad-primary);color:#fff;border-radius:50%;place-items:center;width:40px;height:40px;font-weight:700;display:grid}.main-content{box-sizing:border-box;flex-grow:1;width:100%;max-width:1200px;padding:40px;overflow-y:auto}@media (width<=768px){.main-content{padding:20px}}.auth-wrapper{justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex;position:relative}.auth-card{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-lg);width:100%;max-width:440px;box-shadow:var(--shadow-lg);text-align:center;transition:var(--transition);padding:40px}.auth-title{font-family:var(--font-heading);color:var(--text-primary);margin-bottom:8px;font-size:28px;font-weight:700}.auth-subtitle{color:var(--text-secondary);margin-bottom:32px;font-size:14px}.form-group{text-align:left;margin-bottom:20px}.form-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px;font-size:12px;font-weight:600;display:block}.form-input{background:var(--bg-deep);border:1px solid var(--border-color);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);font-family:var(--font-sans);transition:var(--transition);padding:10px 14px;font-size:14px}.form-input:focus{border-color:var(--color-primary);outline:none;box-shadow:0 0 0 2px #7c3aed1a}.btn-primary{background:var(--color-primary);border-radius:var(--radius-sm);color:#fff;width:100%;font-family:var(--font-sans);cursor:pointer;box-shadow:var(--shadow-sm);transition:var(--transition);border:none;justify-content:center;align-items:center;gap:8px;padding:12px;font-size:14px;font-weight:600;display:flex}.btn-primary:hover{background:var(--color-primary-light);box-shadow:var(--shadow-md)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-secondary{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);font-family:var(--font-sans);cursor:pointer;transition:var(--transition);justify-content:center;align-items:center;gap:8px;padding:12px;font-size:14px;font-weight:600;display:flex}.btn-secondary:hover{background:var(--bg-card-hover);border-color:var(--text-muted)}.divider{text-align:center;color:var(--text-muted);align-items:center;margin:24px 0;font-size:13px;display:flex}.divider:before,.divider:after{content:"";border-bottom:1px solid var(--border-color);flex:1}.divider:before{margin-right:12px}.divider:after{margin-left:12px}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;margin-bottom:32px;display:grid}.stat-card{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);transition:var(--transition);align-items:center;gap:16px;padding:20px;display:flex}.stat-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-md)}.stat-icon{border-radius:var(--radius-sm);width:42px;height:42px;color:var(--color-primary);background:#7c3aed14;place-items:center;display:grid}.stat-value{font-family:var(--font-heading);color:var(--text-primary);font-size:26px;font-weight:700;line-height:1.1}.stat-label{color:var(--text-secondary);font-size:13px;font-weight:500}.glass-card{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-md);margin-bottom:32px;padding:28px}@media (width<=768px){.glass-card{padding:20px}}.card-header-flex{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:24px;display:flex}.card-title{font-family:var(--font-heading);font-size:20px;font-weight:600}.custom-table-wrapper{border-radius:var(--radius-sm);border:1px solid var(--border-color);overflow-x:auto}.custom-table{border-collapse:collapse;text-align:left;width:100%;font-size:14px}.custom-table th{background:var(--bg-deep);color:var(--text-secondary);border-bottom:1px solid var(--border-color);text-transform:uppercase;letter-spacing:.05em;padding:10px 14px;font-size:11px;font-weight:600}.custom-table td{border-bottom:1px solid var(--border-color);color:var(--text-primary);vertical-align:middle;padding:12px 14px}.custom-table tr:last-child td{border-bottom:none}.custom-table tr:hover td{background:#7c3aed05}.light-theme .custom-table tr:hover td{background:#6d28d905}.badge{border-radius:9999px;align-items:center;padding:4px 10px;font-size:12px;font-weight:600;display:inline-flex}.badge.badge-success{color:var(--color-success);background:#10b9811a}.badge.badge-primary{color:var(--color-primary-light);background:#7c3aed1a}.badge.badge-cyan{color:var(--color-secondary);background:#06b6d41a}.grid-2{grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:24px;display:grid}.subject-card{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);padding:24px;position:relative;overflow:hidden}.subject-card:before{content:"";background:var(--subject-color,var(--color-primary));width:6px;height:100%;position:absolute;top:0;left:0}.subject-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-md)}.subject-name{font-family:var(--font-heading);color:var(--text-primary);margin-bottom:8px;font-size:18px;font-weight:600}.autocomplete-container{position:relative}.autocomplete-dropdown{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-sm);z-index:100;width:100%;max-height:240px;box-shadow:var(--shadow-lg);position:absolute;top:calc(100% + 4px);left:0;overflow-y:auto}.autocomplete-item{cursor:pointer;transition:var(--transition);border-bottom:1px solid var(--border-color);padding:12px 16px}.autocomplete-item:last-child{border-bottom:none}.autocomplete-item:hover{background:#7c3aed14}.autocomplete-item-name{color:var(--text-primary);font-size:14px;font-weight:500}.autocomplete-item-meta{color:var(--text-secondary);margin-top:2px;font-size:12px}.study-card-outer{perspective:1000px;cursor:pointer;width:100%;max-width:580px;height:320px;margin:0 auto 32px}.study-card-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);position:relative}.study-card-outer.flipped .study-card-inner{transform:rotateY(180deg)}.study-card-front,.study-card-back{backface-visibility:hidden;border-radius:var(--radius-lg);border:1px solid var(--border-color);width:100%;height:100%;box-shadow:var(--shadow-lg);text-align:center;flex-direction:column;justify-content:center;align-items:center;padding:32px;display:flex;position:absolute}.study-card-front{background:var(--bg-surface);color:var(--text-primary)}.study-card-back{background:var(--bg-surface);color:var(--text-primary);transform:rotateY(180deg)}.study-card-text{font-size:24px;font-weight:600;line-height:1.4;font-family:var(--font-heading);color:var(--text-primary)}.study-card-tip{color:var(--text-secondary);text-transform:uppercase;letter-spacing:1px;font-size:12px;position:absolute;bottom:24px}.rating-bar{flex-wrap:wrap;justify-content:center;gap:10px;margin-top:24px;display:flex}.rating-btn{border:1px solid var(--border-color);border-radius:var(--radius-sm);background:var(--bg-surface);color:var(--text-primary);cursor:pointer;transition:var(--transition);padding:8px 14px;font-size:14px;font-weight:600}.rating-btn:hover{border-color:var(--color-primary);background:#7c3aed0d}.light-theme .rating-btn:hover{background:#6d28d90a}.heatmap-container{grid-template-columns:repeat(7,1fr);gap:4px;max-width:200px;display:grid}.heatmap-day{aspect-ratio:1;background:var(--border-color);transition:var(--transition);border-radius:2px}.heatmap-day.level-1{background:#7c3aed40}.heatmap-day.level-2{background:#7c3aed80}.heatmap-day.level-3{background:#7c3aedbf}.heatmap-day.level-4{background:var(--color-primary)}.light-theme .heatmap-day.level-1{background:#6d28d933}.light-theme .heatmap-day.level-2{background:#6d28d973}.light-theme .heatmap-day.level-3{background:#6d28d9b3}.light-theme .heatmap-day.level-4{background:var(--color-primary)}.calendar-grid{border:1px solid var(--border-color);border-radius:var(--radius-md);grid-template-columns:repeat(7,1fr);margin-bottom:16px;display:grid;overflow:hidden}.calendar-day-header{background:var(--bg-deep);text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);text-align:center;border-bottom:1px solid var(--border-color);padding:10px 8px;font-size:11px;font-weight:700}.calendar-cell{background:var(--bg-surface);border-right:1px solid var(--border-color);border-bottom:1px solid var(--border-color);cursor:pointer;min-height:90px;padding:8px 6px;transition:background .15s;overflow:hidden}.calendar-cell:hover{background:var(--bg-card-hover)}.calendar-cell.today{background:#7c3aed0a}.calendar-cell.today .calendar-day-number{background:var(--color-primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:24px;height:24px;font-weight:700;display:flex}.calendar-cell.other-month{background:var(--bg-deep);opacity:.5}.calendar-day-number{color:var(--text-secondary);justify-content:center;align-items:center;width:24px;height:24px;margin-bottom:4px;font-size:13px;font-weight:600;display:flex}.event-pill{cursor:pointer;white-space:nowrap;text-overflow:ellipsis;border-radius:4px;margin-bottom:2px;padding:2px 6px;font-size:11px;font-weight:600;transition:opacity .15s;overflow:hidden}.event-pill:hover{opacity:.8}.event-modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background:#0009;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.event-modal{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-lg);width:100%;max-width:560px;max-height:90vh;box-shadow:var(--shadow-lg);flex-direction:column;display:flex}.event-modal-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:20px 24px;display:flex}.event-modal-body{flex:1;padding:24px;overflow-y:auto}.event-modal-footer{border-top:1px solid var(--border-color);align-items:center;gap:8px;padding:16px 24px;display:flex}@keyframes fadeIn{0%{opacity:0;transform:scale(.97)}to{opacity:1;transform:scale(1)}}.event-modal{animation:.18s fadeIn}.animate-spin{animation:1s linear infinite spin}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.ai-dropzone{border:2px dashed var(--border-color);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);background:var(--bg-deep);-webkit-user-select:none;user-select:none;justify-content:center;align-items:center;min-height:160px;padding:40px 24px;display:flex}.ai-dropzone:hover,.ai-dropzone.dragover{border-color:var(--color-primary);background:#7c3aed0a}.ai-dropzone.has-file{border-color:var(--color-primary);background:#7c3aed08;border-style:solid}.pomodoro-ring-track{stroke:var(--border-color);stroke-width:10px;fill:none}.pomodoro-ring-progress{fill:none;stroke-width:10px;stroke-linecap:round;transition:stroke-dashoffset .8s,stroke .4s}.pomodoro-center{pointer-events:none;flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.pomodoro-time{font-family:var(--font-heading);letter-spacing:-2px;font-size:54px;font-weight:800;line-height:1}.pomodoro-phase-label{letter-spacing:.5px;text-transform:uppercase;margin-top:6px;font-size:14px;font-weight:600}.pomodoro-round-dots{gap:8px;margin-top:12px;display:flex}.pomodoro-dot{background:var(--border-color);border-radius:50%;width:10px;height:10px;transition:background .3s}.pomodoro-dot.done{background:var(--color-primary)}.pomodoro-dot.active{background:currentColor;box-shadow:0 0 0 2px,0 0 0 4px #0000}.pomodoro-controls{align-items:center;gap:16px;margin-top:28px;display:flex}.pomodoro-btn-main{cursor:pointer;background:var(--grad-primary);color:#fff;border:none;border-radius:50%;justify-content:center;align-items:center;width:64px;height:64px;transition:transform .15s,box-shadow .15s;display:flex;box-shadow:0 4px 20px #7c3aed66}.pomodoro-btn-main:hover{transform:scale(1.07);box-shadow:0 6px 26px #7c3aed80}.pomodoro-btn-icon{border:1px solid var(--border-color);background:var(--bg-surface);width:40px;height:40px;color:var(--text-secondary);cursor:pointer;transition:var(--transition);border-radius:50%;justify-content:center;align-items:center;display:flex}.pomodoro-btn-icon:hover{border-color:var(--color-primary-light);color:var(--color-primary-light)}.pomodoro-settings-panel{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);grid-template-columns:1fr 1fr 1fr;gap:16px;margin-top:24px;padding:20px;display:grid}.pomodoro-setting-label{text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);margin-bottom:6px;font-size:11px;font-weight:700}.quiz-option{text-align:left;border-radius:var(--radius-md);border:1px solid var(--border-color);background:var(--bg-surface);width:100%;color:var(--text-primary);cursor:pointer;font-size:14px;font-family:var(--font-sans);transition:var(--transition);align-items:flex-start;gap:12px;padding:14px 18px;line-height:1.5;display:flex}.quiz-option:hover:not(:disabled){border-color:var(--color-primary-light);background:#7c3aed0a}.quiz-option:disabled{cursor:default}.quiz-option.correct{border-color:var(--color-success);color:var(--color-success);background:#10b98114}.quiz-option.wrong{border-color:var(--color-danger);color:var(--color-danger);background:#ef444414}.quiz-option.selected-wrong{border-color:var(--color-danger);color:var(--color-danger);background:#ef44441f;font-weight:600}.quiz-option-letter{background:var(--border-color);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;min-width:26px;height:26px;font-size:12px;font-weight:700;display:flex}.quiz-option.correct .quiz-option-letter{background:var(--color-success);color:#fff}.quiz-option.wrong .quiz-option-letter,.quiz-option.selected-wrong .quiz-option-letter{background:var(--color-danger);color:#fff}.quiz-progress-bar{background:var(--border-color);border-radius:10px;width:100%;height:5px;margin-bottom:24px;overflow:hidden}.quiz-progress-fill{background:var(--grad-primary);border-radius:10px;height:100%;transition:width .4s}.quiz-explanation{border-radius:var(--radius-md);border-left:3px solid var(--color-primary);color:var(--text-secondary);background:#7c3aed0f;margin-top:16px;padding:14px 18px;font-size:13px;line-height:1.6;animation:.25s fadeIn}.quiz-score-ring{font-family:var(--font-heading);font-size:64px;font-weight:800}.quiz-difficulty-btn{border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;transition:var(--transition);font-size:13px;font-weight:600;font-family:var(--font-sans);background:0 0;border-radius:20px;padding:8px 20px}.quiz-difficulty-btn.active-easy{border-color:var(--color-success);color:var(--color-success);background:#10b9811a}.quiz-difficulty-btn.active-medium{border-color:var(--color-warning);color:var(--color-warning);background:#f59e0b1a}.quiz-difficulty-btn.active-hard{border-color:var(--color-danger);color:var(--color-danger);background:#ef44441a}