:root{--bg-dark: #090B14;--bg-card: rgba(18, 22, 38, .75);--bg-card-hover: rgba(28, 34, 58, .85);--bg-card-subtle: rgba(255, 255, 255, .03);--border-card: rgba(255, 255, 255, .08);--border-card-hover: rgba(129, 140, 248, .35);--text-main: #F1F5F9;--text-muted: #94A3B8;--text-subtle: #64748B;--primary: #6366F1;--primary-light: #818CF8;--primary-glow: rgba(99, 102, 241, .25);--primary-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);--success: #10B981;--success-light: #34D399;--success-bg: rgba(16, 185, 129, .12);--success-border: rgba(16, 185, 129, .3);--warning: #F59E0B;--warning-light: #FBBF24;--warning-bg: rgba(245, 158, 11, .12);--warning-border: rgba(245, 158, 11, .3);--danger: #EF4444;--danger-light: #F87171;--danger-bg: rgba(239, 68, 68, .12);--info: #06B6D4;--info-light: #38BDF8;--info-bg: rgba(6, 182, 212, .12);--font-sans: "Inter", system-ui, -apple-system, sans-serif;--font-heading: "Outfit", var(--font-sans);--font-mono: "JetBrains Mono", monospace;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .4);--shadow-md: 0 8px 24px -4px rgba(0, 0, 0, .5);--shadow-lg: 0 16px 36px -6px rgba(0, 0, 0, .6);--shadow-glow: 0 0 24px rgba(99, 102, 241, .25)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-dark);background-image:radial-gradient(circle at 15% 15%,rgba(79,70,229,.12) 0%,transparent 40%),radial-gradient(circle at 85% 85%,rgba(124,58,237,.1) 0%,transparent 40%),linear-gradient(180deg,#090b14,#0d111e);background-attachment:fixed;color:var(--text-main);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased}.app-container{max-width:1180px;margin:0 auto;padding:24px 20px 80px}.app-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;padding:16px 24px;background:var(--bg-card);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--border-card);border-radius:16px;margin-bottom:24px;box-shadow:var(--shadow-sm)}.brand-section{display:flex;align-items:center;gap:12px}.brand-logo{font-size:2rem;line-height:1}.brand-title{font-family:var(--font-heading);font-size:1.6rem;font-weight:800;background:linear-gradient(135deg,#fff,#a5b4fc);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.5px}.brand-subtitle{font-size:.82rem;color:var(--text-muted)}.header-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;font-size:.8rem;font-weight:600;letter-spacing:.3px}.badge-day{background:#6366f126;color:var(--primary-light);border:1px solid rgba(99,102,241,.3)}.badge-streak{background:#f59e0b26;color:var(--warning-light);border:1px solid rgba(245,158,11,.3)}.badge-backend{cursor:pointer;transition:all .2s ease}.badge-backend.ready{background:var(--success-bg);color:var(--success-light);border:1px solid var(--success-border)}.badge-backend.waking{background:var(--warning-bg);color:var(--warning-light);border:1px solid var(--warning-border);animation:pulse-border 1.5s infinite}.badge-backend.offline{background:var(--danger-bg);color:var(--danger-light);border:1px solid rgba(239,68,68,.3)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:8px 16px;border-radius:10px;font-family:var(--font-sans);font-size:.9rem;font-weight:600;cursor:pointer;border:1px solid transparent;transition:all .2s cubic-bezier(.4,0,.2,1);text-decoration:none}.btn-primary{background:var(--primary-gradient);color:#fff;box-shadow:0 4px 12px var(--primary-glow)}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px #6366f166}.btn-outline{background:var(--bg-card-subtle);border-color:var(--border-card);color:var(--text-main)}.btn-outline:hover{background:#ffffff14;border-color:var(--primary-light);color:#fff}.btn-sm{padding:5px 10px;font-size:.8rem;border-radius:8px}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.wake-banner{background:linear-gradient(135deg,#f59e0b1f,#6366f126);border:1px solid rgba(245,158,11,.35);border-radius:14px;padding:16px 20px;margin-bottom:24px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.wake-info{display:flex;align-items:center;gap:12px}.wake-spinner{width:20px;height:20px;border:2px solid rgba(255,255,255,.2);border-top-color:var(--warning-light);border-radius:50%;animation:spin .8s linear infinite}.quote-card{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-card);border-left:4px solid var(--primary-light);border-radius:14px;padding:20px 24px;margin-bottom:24px;position:relative;overflow:hidden}.quote-text{font-size:1.15rem;font-style:italic;color:#e2e8f0;margin-bottom:8px;line-height:1.5}.quote-author{font-size:.88rem;color:var(--primary-light);font-weight:500;text-align:right}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;margin-bottom:24px}.stat-card{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-card);border-radius:14px;padding:18px 20px;transition:all .2s ease}.stat-card:hover{transform:translateY(-2px);border-color:var(--border-card-hover);box-shadow:var(--shadow-sm)}.stat-label{font-size:.82rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px}.stat-value{font-family:var(--font-heading);font-size:1.8rem;font-weight:700;color:#fff}.stat-subtext{font-size:.78rem;color:var(--text-subtle);margin-top:4px}.progress-container{background:var(--bg-card);border:1px solid var(--border-card);border-radius:14px;padding:16px 20px;margin-bottom:24px}.progress-header{display:flex;justify-content:space-between;margin-bottom:8px;font-size:.88rem}.progress-track{width:100%;height:10px;background:#ffffff0f;border-radius:999px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#6366f1,#10b981);border-radius:999px;transition:width .5s ease-out}.section-title{font-family:var(--font-heading);font-size:1.35rem;font-weight:700;color:#fff;margin-bottom:16px;display:flex;align-items:center;justify-content:space-between}.questions-list{display:flex;flex-direction:column;gap:16px;margin-bottom:32px}.question-card{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-card);border-radius:16px;padding:22px 24px;transition:all .2s ease;position:relative}.question-card:hover{border-color:var(--border-card-hover);box-shadow:var(--shadow-sm)}.question-card.solved{border-left:4px solid var(--success);background:linear-gradient(135deg,#10b9810d,#121626cc)}.question-top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:12px;flex-wrap:wrap}.question-title{font-family:var(--font-heading);font-size:1.15rem;font-weight:600;color:#fff;text-decoration:none;display:inline-flex;align-items:center;gap:8px}.question-title:hover{color:var(--primary-light)}.question-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:16px}.tag{font-size:.75rem;padding:3px 8px;border-radius:6px;background:#ffffff0f;color:var(--text-muted)}.tag-easy{background:#10b98126;color:var(--success-light);border:1px solid rgba(16,185,129,.3)}.tag-medium{background:#f59e0b26;color:var(--warning-light);border:1px solid rgba(245,158,11,.3)}.tag-hard{background:#ef444426;color:var(--danger-light);border:1px solid rgba(239,68,68,.3)}.question-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding-top:12px;border-top:1px solid rgba(255,255,255,.05)}.btn-action{font-size:.82rem;padding:6px 12px;border-radius:8px}.btn-action.active-solved{background:var(--success);color:#fff;border-color:var(--success)}.btn-action.active-attempted{background:var(--warning);color:#fff;border-color:var(--warning)}.btn-action.active-revision{background:var(--info);color:#fff;border-color:var(--info)}.sync-section{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-card);border-radius:16px;padding:24px;margin-bottom:32px}.sync-form{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:16px}.form-group label{display:block;font-size:.82rem;color:var(--text-muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:.4px}.form-control{width:100%;background:#0000004d;border:1px solid var(--border-card);border-radius:8px;padding:10px 12px;color:#fff;font-family:var(--font-sans);font-size:.9rem;transition:border-color .2s ease}.form-control:focus{outline:none;border-color:var(--primary-light)}.sessions-table-wrapper{background:var(--bg-card);border:1px solid var(--border-card);border-radius:14px;overflow:hidden;margin-bottom:32px}.sessions-table{width:100%;border-collapse:collapse;font-size:.88rem}.sessions-table th{background:#ffffff05;text-align:left;padding:12px 16px;color:var(--text-muted);font-weight:600;border-bottom:1px solid var(--border-card)}.sessions-table td{padding:12px 16px;border-bottom:1px solid rgba(255,255,255,.04)}.sessions-table tr:hover{background:#ffffff05}@keyframes spin{to{transform:rotate(360deg)}}@keyframes pulse-border{0%,to{border-color:#f59e0b4d}50%{border-color:#f59e0bcc}}@media(max-width:768px){.app-header{flex-direction:column;align-items:flex-start}.header-actions{width:100%;justify-content:flex-start}.question-actions{justify-content:stretch}.question-actions .btn{flex:1 1 calc(50% - 4px)}}