@import"https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap";:root,[data-theme=light]{--bg-deep: #e8eff5;--bg-surface: #ffffff;--bg-glass: rgba(255, 255, 255, .9);--primary: #0ea5e9;--primary-glow: rgba(14, 165, 233, .1);--accent: #f43f5e;--text-main: #0f172a;--text-muted: #64748b;--border: #cbd5e1;--border-light: rgba(203, 213, 225, .6);--diff-easy: #10b981;--diff-medium: #f59e0b;--diff-hard: #f43f5e;--diff-easy-bg: rgba(16, 185, 129, .4);--diff-medium-bg: rgba(245, 158, 11, .4);--diff-hard-bg: rgba(244, 63, 94, .4);--status-success-bg: rgba(16, 185, 129, .4);--status-error-bg: rgba(244, 63, 94, .4);--shadow-sm: 0 2px 4px rgba(15, 23, 42, .05);--shadow-md: 0 4px 6px -1px rgba(15, 23, 42, .08);--shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, .1);--shadow-premium: 0 20px 25px -5px rgba(15, 23, 42, .1), 0 10px 10px -5px rgba(15, 23, 42, .04);--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .4s ease;--transition-spring: .5s cubic-bezier(.34, 1.56, .64, 1)}[data-theme=dark]{--bg-deep: #0c1524;--bg-surface: #1e293b;--bg-glass: rgba(30, 41, 59, .8);--primary: #0ea5e9;--primary-glow: rgba(14, 165, 233, .15);--accent: #f43f5e;--text-main: #f8fafc;--text-muted: #94a3b8;--border: #334155;--border-light: rgba(51, 65, 85, .5);--shadow-sm: 0 2px 4px rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5);--shadow-premium: 0 20px 25px -5px rgba(0, 0, 0, .5)}*{margin:0;padding:0;box-sizing:border-box;font-family:Plus Jakarta 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slideInRight{0%{transform:translate(30px);opacity:0}to{transform:translate(0);opacity:1}}.slide-in-up{animation:slideInUp .4s ease-out}.slide-in-down{animation:slideInDown .4s ease-out}.slide-in-left{animation:slideInLeft .4s ease-out}.slide-in-right{animation:slideInRight .4s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.fade-in{animation:fadeIn .3s ease-out}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.spin{animation:spin 1s linear infinite}@keyframes scaleIn{0%{transform:scale(.8);opacity:0}to{transform:scale(1);opacity:1}}.scale-in{animation:scaleIn .3s var(--transition-spring)}.ripple{position:relative;overflow:hidden}.ripple:after{content:"";position:absolute;width:100%;height:100%;top:0;left:0;pointer-events:none;background-image:radial-gradient(circle,var(--primary) 10%,transparent 10.01%);background-repeat:no-repeat;background-position:50%;transform:scale(10);opacity:0;transition:transform .5s,opacity 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var(--transition-fast)}::-webkit-scrollbar-thumb:hover{background:var(--primary)}::selection{background:var(--primary);color:#fff}.tooltip{position:relative}.tooltip:after{content:attr(data-tooltip);position:absolute;bottom:100%;left:50%;transform:translate(-50%) translateY(-8px);padding:6px 12px;background:var(--text-main);color:#fff;font-size:12px;border-radius:6px;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity var(--transition-fast),transform var(--transition-fast)}.tooltip:hover:after{opacity:1;transform:translate(-50%) translateY(-4px)}.badge-pulse{position:relative}.badge-pulse:before{content:"";position:absolute;inset:-2px;border-radius:inherit;background:var(--accent);animation:pulse 1.5s ease-out infinite;z-index:-1}[data-theme=dark]{--bg-deep: #0c1524;--bg-surface: #1e293b;--bg-glass: rgba(30, 41, 59, .85);--primary-glow: rgba(14, 165, 233, .15);--text-main: #f1f5f9;--text-muted: #94a3b8;--border: #334155;--border-light: rgba(51, 65, 85, .5);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .3);--shadow-premium: 0 20px 25px -5px rgba(0, 0, 0, .3), 0 10px 10px -5px rgba(0, 0, 0, .15)}[data-theme=dark] body{background-image:url(/study-bg-dark.png)}[data-theme=dark] .glass{border-color:#475569;box-shadow:0 4px 6px -1px #0000004d}[data-theme=dark] .skeleton{background:linear-gradient(90deg,#1e293b 25%,#334155,#1e293b 75%)}[data-high-contrast=true]{--bg-glass: var(--bg-surface);--border-light: var(--border);--text-muted: var(--text-main);--primary-glow: transparent;--shadow-sm: none;--shadow-md: none;--shadow-lg: none;--shadow-premium: none;--diff-easy-bg: var(--diff-easy);--diff-medium-bg: var(--diff-medium);--diff-hard-bg: var(--diff-hard);--status-success-bg: var(--diff-easy);--status-error-bg: var(--diff-hard);--border-light: black}[data-high-contrast=true] .glass{background:var(--bg-surface)!important;backdrop-filter:none!important;-webkit-backdrop-filter:none!important;border-width:2px!important;box-shadow:none!important}[data-high-contrast=true] .glass:hover{box-shadow:none!important;border-color:var(--primary)!important}[data-high-contrast=true] body{background-image:none!important;background-color:var(--bg-deep)!important}[data-high-contrast=true] .gradient-text,[data-high-contrast=true] .gradient-text-accent{background:none!important;-webkit-text-fill-color:initial!important;color:var(--primary)!important}[data-high-contrast=true] .btn-primary{background:var(--primary)!important;box-shadow:none!important;border:2px solid black}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg-deep: #0c1524;--bg-surface: #1e293b;--bg-glass: rgba(30, 41, 59, .85);--primary-glow: rgba(14, 165, 233, .15);--text-main: #f1f5f9;--text-muted: #94a3b8;--border: #334155;--border-light: rgba(51, 65, 85, 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