@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap";:root{--primary: #4f46e5;--primary-dark: #4338ca;--primary-light: #6366f1;--secondary: #06b6d4;--success: #10b981;--warning: #f59e0b;--error: #ef4444;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-300: #d1d5db;--gray-400: #9ca3af;--gray-500: #6b7280;--gray-600: #4b5563;--gray-700: #374151;--gray-800: #1f2937;--gray-900: #111827;--bg: #ffffff;--bg-secondary: var(--gray-50);--text: var(--gray-900);--text-secondary: var(--gray-600);--border: var(--gray-200);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow: 0 1px 3px 0 rgb(0 0 0 / .1), 0 1px 2px -1px rgb(0 0 0 / .1);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1)}*{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;font-size:.9375rem;font-weight:600;line-height:1;border-radius:var(--radius-md);border:none;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);white-space:nowrap}.btn-primary{background:var(--primary);color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--primary-dark);box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--gray-100);color:var(--text)}.btn-secondary:hover{background:var(--gray-200)}.btn-lg{padding:1rem 2rem;font-size:1rem}.card{background:var(--bg);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow);border:1px solid var(--border);transition:all .3s cubic-bezier(.4,0,.2,1)}.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.card-compact{padding:1rem}.progress-bar{width:100%;height:8px;background:var(--gray-200);border-radius:999px;overflow:hidden;position:relative}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-light));border-radius:999px;transition:width .6s cubic-bezier(.4,0,.2,1);position:relative;box-shadow:0 0 12px #4f46e566}.badge{display:inline-flex;align-items:center;gap:.375rem;padding:.375rem .75rem;font-size:.8125rem;font-weight:600;border-radius:var(--radius-sm);white-space:nowrap}.badge-primary{background:#eef2ff;color:var(--primary)}.badge-success{background:#d1fae5;color:#065f46}.badge-warning{background:#fef3c7;color:#92400e}.study-card-modern{background:var(--bg);border-radius:var(--radius-xl);padding:3rem 2rem;box-shadow:var(--shadow-xl);border:1px solid var(--border);min-height:320px;display:flex;align-items:center;justify-content:center;text-align:center;transition:all .4s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.study-card-modern:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary),var(--secondary))}.study-card-modern.flipped{background:linear-gradient(135deg,#faf5ff,#f5f3ff)}.rating-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.75rem}@media(min-width:640px){.rating-grid{grid-template-columns:repeat(4,1fr)}}.rating-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1.25rem .75rem;border-radius:var(--radius-md);border:2px solid transparent;font-weight:600;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);min-height:96px}.rating-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.rating-btn:active{transform:translateY(0)}.rating-again{background:linear-gradient(135deg,#fee2e2,#fecaca);color:#991b1b;border-color:#fca5a5}.rating-again:hover{background:linear-gradient(135deg,#fecaca,#fca5a5)}.rating-hard{background:linear-gradient(135deg,#fed7aa,#fdba74);color:#9a3412;border-color:#fb923c}.rating-hard:hover{background:linear-gradient(135deg,#fdba74,#fb923c)}.rating-good{background:linear-gradient(135deg,#d1fae5,#a7f3d0);color:#065f46;border-color:#6ee7b7}.rating-good:hover{background:linear-gradient(135deg,#a7f3d0,#6ee7b7)}.rating-easy{background:linear-gradient(135deg,#dbeafe,#bfdbfe);color:#1e40af;border-color:#93c5fd}.rating-easy:hover{background:linear-gradient(135deg,#bfdbfe,#93c5fd)}.deck-card{background:var(--bg);border-radius:var(--radius-lg);padding:1.25rem;box-shadow:var(--shadow);border:1px solid var(--border);transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;gap:1rem;align-items:flex-start}.deck-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px);border-color:var(--primary-light)}.deck-thumbnail{width:80px;height:80px;border-radius:var(--radius-md);background:var(--gray-100);flex-shrink:0;overflow:hidden;display:flex;align-items:center;justify-content:center}.deck-thumbnail img{width:100%;height:100%;object-fit:cover}.stats-card{background:linear-gradient(135deg,var(--bg) 0%,var(--gray-50) 100%);border-radius:var(--radius-lg);padding:2rem;box-shadow:var(--shadow-md);border:1px solid var(--border)}.stat-value{font-size:2.5rem;font-weight:800;line-height:1;color:var(--primary);letter-spacing:-.025em}.stat-label{font-size:.875rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;margin-top:.5rem}.spinner{width:40px;height:40px;border:3px solid var(--gray-200);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeInUp .5s cubic-bezier(.4,0,.2,1)}.fade-in-delay-1{animation-delay:.1s;opacity:0;animation-fill-mode:forwards}.fade-in-delay-2{animation-delay:.2s;opacity:0;animation-fill-mode:forwards}.fade-in-delay-3{animation-delay:.3s;opacity:0;animation-fill-mode:forwards}.heading-xl{font-size:3rem;font-weight:800;line-height:1.1;letter-spacing:-.025em;color:var(--text)}.heading-lg{font-size:2rem;font-weight:700;line-height:1.2;letter-spacing:-.02em;color:var(--text)}.heading-md{font-size:1.5rem;font-weight:700;line-height:1.3;color:var(--text)}.text-body{font-size:1rem;line-height:1.6;color:var(--text-secondary)}@media(max-width:640px){.heading-xl{font-size:2rem}.heading-lg{font-size:1.5rem}.study-card-modern{padding:2rem 1.5rem;min-height:280px}.deck-thumbnail{width:64px;height:64px}}