:root{--brand-gradient: linear-gradient(135deg, #8b5cf6 0%, #d946ef 100%);--brand-gradient-hover: linear-gradient(135deg, #7c3aed 0%, #c084fc 100%);--color-new: #3b82f6;--color-new-bg: rgba(59, 130, 246, .15);--color-new-border: rgba(59, 130, 246, .3);--color-learn: #ef4444;--color-learn-bg: rgba(239, 68, 68, .15);--color-learn-border: rgba(239, 68, 68, .3);--color-due: #10b981;--color-due-bg: rgba(16, 185, 129, .15);--color-due-border: rgba(16, 185, 129, .3);--color-streak: #f59e0b;--color-streak-bg: rgba(245, 158, 11, .12);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .05);--shadow-md: 0 8px 24px rgba(0, 0, 0, .1);--shadow-lg: 0 16px 40px rgba(0, 0, 0, .2);--shadow-inset: inset 0 2px 4px rgba(255, 255, 255, .05);--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--radius-xl: 30px;--transition-fast: .15s ease;--transition-normal: .3s cubic-bezier(.4, 0, .2, 1);--transition-slow: .5s cubic-bezier(.4, 0, .2, 1)}body.dark-theme{--bg-color: #080b11;--surface-color: rgba(15, 22, 36, .7);--surface-solid: #0f1624;--surface-hover: rgba(26, 36, 56, .85);--border-color: rgba(255, 255, 255, .07);--border-focus: rgba(139, 92, 246, .5);--text-primary: #f3f4f6;--text-secondary: #9ca3af;--text-muted: #6b7280;--glass-bg: rgba(15, 22, 36, .5);--glass-border: rgba(255, 255, 255, .06);--kbd-bg: #1e293b;--kbd-color: #94a3b8;--mesh-opacity: .15}body.light-theme{--bg-color: #f6f8fc;--surface-color: rgba(255, 255, 255, .75);--surface-solid: #ffffff;--surface-hover: rgba(241, 245, 249, .9);--border-color: rgba(0, 0, 0, .08);--border-focus: rgba(139, 92, 246, .5);--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--glass-bg: rgba(255, 255, 255, .6);--glass-border: rgba(0, 0, 0, .05);--kbd-bg: #e2e8f0;--kbd-color: #475569;--mesh-opacity: .07}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Plus Jakarta Sans,system-ui,-apple-system,sans-serif;background-color:var(--bg-color);color:var(--text-primary);min-height:100vh;overflow-x:hidden;transition:background-color var(--transition-normal),color var(--transition-normal);position:relative}h1,h2,h3,h4{font-family:Outfit,system-ui,-apple-system,sans-serif;font-weight:700;letter-spacing:-.02em}a{text-decoration:none}.bg-mesh{position:fixed;width:600px;height:600px;border-radius:50%;filter:blur(100px);pointer-events:none;z-index:-1;opacity:var(--mesh-opacity);transition:opacity var(--transition-normal)}.bg-mesh-1{background:radial-gradient(circle,#8b5cf6,#8b5cf600 70%);top:-200px;left:-200px;animation:meshFloat1 25s infinite alternate ease-in-out}.bg-mesh-2{background:radial-gradient(circle,#ec4899,#ec489900 70%);bottom:-200px;right:-200px;animation:meshFloat2 25s infinite alternate ease-in-out}@keyframes meshFloat1{0%{transform:translate(0) scale(1)}to{transform:translate(100px,80px) scale(1.1)}}@keyframes meshFloat2{0%{transform:translate(0) scale(1.1)}to{transform:translate(-100px,-80px) scale(.9)}}.app-container{max-width:1200px;margin:0 auto;padding:0 24px 48px;display:flex;flex-direction:column;min-height:100vh}.app-header{display:flex;align-items:center;justify-content:space-between;padding:24px 0;border-bottom:1px solid var(--border-color);margin-bottom:32px}.brand{display:flex;align-items:center;gap:12px}.brand-logo{display:flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:var(--radius-md);background:var(--brand-gradient);color:#fff;box-shadow:0 4px 12px #8b5cf64d}.brand h1{font-size:24px;background:var(--brand-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.app-nav{display:flex;background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--glass-border);padding:4px;border-radius:var(--radius-lg);gap:4px}.nav-btn{background:transparent;border:none;color:var(--text-secondary);font-family:Plus Jakarta Sans,sans-serif;font-weight:600;font-size:14px;padding:10px 20px;border-radius:var(--radius-md);cursor:pointer;display:flex;align-items:center;gap:8px;transition:all var(--transition-fast)}.nav-btn i{width:16px;height:16px}.nav-btn:hover{color:var(--text-primary);background:#ffffff0d}.nav-btn.active{color:#fff;background:var(--brand-gradient);box-shadow:0 4px 12px #8b5cf640}.header-actions{display:flex;align-items:center;gap:12px}.icon-btn{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--glass-border);color:var(--text-primary);width:42px;height:42px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition-fast)}.icon-btn:hover{background:var(--surface-hover);transform:translateY(-2px)}.icon-btn i{width:20px;height:20px}body.dark-theme .sun-icon,body.light-theme .moon-icon{display:block}body.dark-theme .moon-icon,body.light-theme .sun-icon{display:none}.app-view{display:none;animation:fadeIn .4s ease-out forwards}.app-view.active{display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:Plus Jakarta Sans,sans-serif;font-weight:600;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);padding:12px 24px;font-size:15px;border:1px solid transparent}.btn-sm{padding:8px 16px;font-size:13px;border-radius:var(--radius-sm)}.btn-lg{padding:16px 32px;font-size:17px;border-radius:var(--radius-lg)}.btn-block{width:100%}.btn-primary{background:var(--brand-gradient);color:#fff;box-shadow:0 4px 14px #8b5cf64d}.btn-primary:hover{background:var(--brand-gradient-hover);transform:translateY(-2px);box-shadow:0 6px 20px #8b5cf666}.btn-secondary{background:var(--glass-bg);border:1px solid var(--glass-border);color:var(--text-primary)}.btn-secondary:hover{background:var(--surface-hover);transform:translateY(-2px)}.btn-danger{background:linear-gradient(135deg,#ef4444,#b91c1c);color:#fff;box-shadow:0 4px 12px #ef444433}.btn-danger:hover{background:linear-gradient(135deg,#dc2626,#991b1b);transform:translateY(-2px)}.btn-warning{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;box-shadow:0 4px 12px #f59e0b33}.btn-warning:hover{background:linear-gradient(135deg,#d97706,#b45309);transform:translateY(-2px)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important;box-shadow:none!important}kbd{background:var(--kbd-bg);color:var(--kbd-color);border-radius:4px;padding:2px 6px;font-size:11px;font-family:monospace;box-shadow:0 1px #0003;margin-left:8px;display:inline-block}.kbd-sm{margin-left:0;margin-top:4px}.dashboard-summary{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;margin-bottom:40px}.summary-card{background:var(--surface-color);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:24px;display:flex;align-items:center;gap:20px;box-shadow:var(--shadow-sm);transition:transform var(--transition-normal),border var(--transition-normal)}.summary-card:hover{transform:translateY(-4px);border-color:var(--border-focus)}.summary-icon{width:54px;height:54px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center}.summary-icon i{width:26px;height:26px}.streak-icon{background:var(--color-streak-bg);color:var(--color-streak)}.studied-icon{background:var(--color-due-bg);color:var(--color-due)}.cards-icon{background:var(--color-new-bg);color:var(--color-new)}.summary-info{display:flex;flex-direction:column}.summary-label{font-size:13px;color:var(--text-secondary);font-weight:500}.summary-value{font-family:Outfit,sans-serif;font-size:22px;font-weight:700;margin-top:4px}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.section-header h2{font-size:26px;color:var(--text-primary)}.decks-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}.deck-card{background:var(--surface-color);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:24px;display:flex;flex-direction:column;position:relative;box-shadow:var(--shadow-sm);transition:all 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i{width:36px;height:36px;stroke-width:1.5}.study-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.study-title-group{text-align:center}.study-title-group h2{font-size:22px}#study-progress-text{font-size:13px;color:var(--text-secondary);font-weight:500;margin-top:4px;display:block}.progress-container{width:100%;height:6px;background:var(--border-color);border-radius:var(--radius-xl);overflow:hidden;margin-bottom:40px}.progress-bar{height:100%;background:var(--brand-gradient);border-radius:var(--radius-xl);transition:width .3s cubic-bezier(.4,0,.2,1)}.card-outer-container{perspective:1200px;width:100%;max-width:680px;height:380px;margin:0 auto 40px}.flashcard{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform 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translateY(10px)}}dialog{opacity:0;transform:scale(.95) translateY(10px);transition-property:opacity,transform,display,overlay;transition-duration:.3s;transition-timing-function:cubic-bezier(.34,1.56,.64,1);transition-behavior:allow-discrete}dialog::backdrop{background-color:#0000;-webkit-backdrop-filter:blur(0px);backdrop-filter:blur(0px);transition:display .3s allow-discrete,overlay .3s allow-discrete,background-color .3s ease-out,backdrop-filter .3s ease-out}dialog[open]::backdrop{background-color:#05080fb3;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}@starting-style{{background-color:#0000;-webkit-backdrop-filter:blur(0px);backdrop-filter:blur(0px)}}@media (prefers-reduced-motion: reduce){dialog{transform:none;transition-duration:.1s}@starting-style{dialog[open]{transform:none}}}.dialog-header{display:flex;align-items:center;justify-content:space-between;padding:24px;border-bottom:1px solid var(--border-color)}.dialog-header h3{font-size:20px}.dialog-close{background:transparent;border:none;color:var(--text-secondary);cursor:pointer;padding:6px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.dialog-close:hover{background:#ffffff14;color:var(--text-primary)}.dialog-body{padding:24px}.dialog-desc{font-size:14px;color:var(--text-secondary);margin-bottom:24px;line-height:1.5}form{padding:24px}.form-group{margin-bottom:20px;display:flex;flex-direction:column;gap:8px}.form-group:last-of-type{margin-bottom:0}label{font-size:13px;font-weight:600;color:var(--text-secondary)}input[type=text],select,textarea{background:var(--bg-color);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:12px 16px;color:var(--text-primary);font-family:Plus Jakarta Sans,sans-serif;font-size:14px;outline:none;transition:border-color var(--transition-fast),box-shadow var(--transition-fast);width:100%}input[type=text]:focus,select:focus,textarea:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #8b5cf626}textarea{resize:vertical}.dialog-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:28px}.data-section{display:flex;flex-direction:column;gap:12px}.section-desc{font-size:12px;color:var(--text-muted)}.divider{height:1px;background:var(--border-color);margin:24px 0}.file-upload-wrapper{position:relative;border:2px dashed var(--border-color);border-radius:var(--radius-md);padding:24px;text-align:center;cursor:pointer;transition:border-color var(--transition-fast)}.file-upload-wrapper:hover{border-color:var(--border-focus)}.file-input{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;cursor:pointer}.file-upload-trigger{display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--text-secondary)}.file-upload-trigger i{width:32px;height:32px}.file-info{margin-top:12px;font-size:13px;color:var(--color-due);text-align:center}.import-actions{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}.deck-option-buttons{display:flex;flex-direction:column;gap:12px;padding:24px}@media (max-width: 768px){.app-header{flex-direction:column;gap:16px;padding:16px 0}.brand{align-self:flex-start}.header-actions{align-self:flex-end;margin-top:-46px}.app-nav{width:100%;justify-content:space-around}.nav-btn{padding:8px 12px;font-size:13px;flex-grow:1;justify-content:center}.browser-layout{grid-template-columns:1fr}.browser-sidebar{position:sticky;top:0;z-index:10}.card-outer-container{height:320px}.card-face{padding:24px}.card-content{font-size:20px}.btn-rate{padding:12px 4px}.rate-label{font-size:13px}.rate-time{font-size:10px}}