:root{--bg-main: #060a12;--bg-surface: #0b1322;--bg-card: #101c33;--bg-card-hover: #142340;--bg-elevated: #182a4d;--border-dim: rgba(255, 255, 255, .08);--border-focus: rgba(0, 229, 255, .4);--border-cyan: #00e5ff;--border-active: #00b4d8;--cyan-primary: #00e5ff;--cyan-glow: rgba(0, 229, 255, .25);--teal-accent: #00b4d8;--amber-warning: #ffb703;--amber-glow: rgba(255, 183, 3, .2);--emerald-success: #10b981;--emerald-glow: rgba(16, 185, 129, .2);--coral-error: #f43f5e;--violet-quest: #a855f7;--text-main: #f1f5f9;--text-muted: #94a3b8;--text-subtle: #64748b;--text-cyan: #38bdf8;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", monospace;--font-display: "Outfit", "Inter", sans-serif;--sidebar-width: 270px;--header-height: 70px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-full: 9999px;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .4);--shadow-md: 0 4px 14px rgba(0, 0, 0, .5);--shadow-lg: 0 10px 30px rgba(0, 0, 0, .6);--shadow-glow: 0 0 20px rgba(0, 229, 255, .15)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{background-color:var(--bg-main);color:var(--text-main);font-family:var(--font-sans);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased;min-height:100vh;overflow-x:hidden}body:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background-image:linear-gradient(to right,rgba(0,229,255,.015) 1px,transparent 1px),linear-gradient(to bottom,rgba(0,229,255,.015) 1px,transparent 1px);background-size:40px 40px;pointer-events:none;z-index:0}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.app-container{display:flex;min-height:100vh;position:relative;z-index:1}.main-content{flex:1;margin-left:var(--sidebar-width);padding-top:var(--header-height);padding-bottom:40px;min-width:0;display:flex;flex-direction:column}.page-wrapper{max-width:1380px;width:100%;margin:0 auto;padding:24px 32px}.sidebar{width:var(--sidebar-width);background:var(--bg-surface);border-right:1px solid var(--border-dim);position:fixed;top:0;bottom:0;left:0;z-index:50;display:flex;flex-direction:column;overflow-y:auto}.sidebar-header{height:var(--header-height);display:flex;align-items:center;padding:0 20px;border-bottom:1px solid var(--border-dim);gap:12px}.brand-title{font-family:var(--font-display);font-size:1.15rem;font-weight:800;letter-spacing:-.02em;color:#fff;display:flex;align-items:center;gap:6px}.brand-badge{background:linear-gradient(135deg,#00e5ff33,#00b4d81a);color:var(--cyan-primary);border:1px solid rgba(0,229,255,.3);font-size:.65rem;font-weight:700;padding:2px 6px;border-radius:var(--radius-sm);text-transform:uppercase;letter-spacing:.05em}.sidebar-nav{padding:16px 12px;display:flex;flex-direction:column;gap:4px;flex:1}.nav-section-label{font-size:.7rem;font-weight:700;text-transform:uppercase;color:var(--text-subtle);padding:10px 12px 4px;letter-spacing:.08em}.nav-item{display:flex;align-items:center;gap:12px;padding:9px 14px;border-radius:var(--radius-md);color:var(--text-muted);text-decoration:none;font-weight:500;font-size:.9rem;cursor:pointer;transition:all .15s ease;border:1px solid transparent;background:transparent;width:100%;text-align:left}.nav-item:hover{color:#fff;background:#ffffff0a;border-color:#ffffff0d}.nav-item.active{color:var(--cyan-primary);background:linear-gradient(90deg,#00e5ff1f,#00b4d80a);border-color:#00e5ff40;box-shadow:inset 3px 0 0 var(--cyan-primary);font-weight:600}.nav-icon{width:18px;height:18px;flex-shrink:0}.sidebar-footer{padding:16px;border-top:1px solid var(--border-dim);background:#0003}.top-header{height:var(--header-height);position:fixed;top:0;right:0;left:var(--sidebar-width);background:#0b1322d9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-dim);z-index:40;display:flex;align-items:center;justify-content:space-between;padding:0 32px}.header-left,.header-right{display:flex;align-items:center;gap:16px}.header-stat-chip{display:flex;align-items:center;gap:8px;background:var(--bg-card);border:1px solid var(--border-dim);padding:6px 12px;border-radius:var(--radius-full);font-size:.82rem;font-weight:600}.header-stat-chip.streak{border-color:#ffb7034d;color:var(--amber-warning)}.header-stat-chip.xp{border-color:#00e5ff4d;color:var(--cyan-primary)}.header-stat-chip.level{border-color:#a855f74d;color:var(--violet-quest)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--font-sans);font-weight:600;font-size:.88rem;padding:9px 18px;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);text-decoration:none}.btn-primary{background:linear-gradient(135deg,#00e5ff,#00b4d8);color:#060a12;box-shadow:0 0 15px #00e5ff4d;border-color:#fff3}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 0 25px #00e5ff73}.btn-secondary{background:var(--bg-card);border:1px solid var(--border-dim);color:var(--text-main)}.btn-secondary:hover{background:var(--bg-card-hover);border-color:#ffffff26;color:#fff}.btn-danger{background:#f43f5e1f;border:1px solid rgba(244,63,94,.3);color:var(--coral-error)}.btn-danger:hover{background:#f43f5e33}.btn-sm{padding:6px 12px;font-size:.8rem;border-radius:var(--radius-sm)}.card{background:var(--bg-card);border:1px solid var(--border-dim);border-radius:var(--radius-lg);padding:22px;position:relative;overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease}.card:hover{border-color:#ffffff1f}.card-cyan-accent{border-top:3px solid var(--cyan-primary)}.card-amber-accent{border-top:3px solid var(--amber-warning)}.card-violet-accent{border-top:3px solid var(--violet-quest)}.card-emerald-accent{border-top:3px solid var(--emerald-success)}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.metric-card{background:var(--bg-card);border:1px solid var(--border-dim);border-radius:var(--radius-lg);padding:20px;display:flex;flex-direction:column;justify-content:space-between}.metric-label{font-size:.78rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);display:flex;align-items:center;justify-content:space-between}.metric-value{font-family:var(--font-display);font-size:2.2rem;font-weight:800;color:#fff;margin:10px 0 4px;letter-spacing:-.02em}.metric-subtitle{font-size:.8rem;color:var(--text-subtle)}.progress-bar-bg{width:100%;height:8px;background:#ffffff14;border-radius:var(--radius-full);overflow:hidden;margin:8px 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ease;font-size:.95rem}.option-card:hover{background:var(--bg-card-hover);border-color:#ffffff26}.option-card.selected{border-color:var(--cyan-primary);background:#00e5ff14;box-shadow:0 0 15px #00e5ff26}.option-card.correct{border-color:var(--emerald-success);background:#10b98126}.option-card.incorrect{border-color:var(--coral-error);background:#f43f5e26}.option-badge{width:32px;height:32px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;background:#ffffff0d;border:1px solid rgba(255,255,255,.1);color:var(--text-muted);flex-shrink:0}.option-card.selected .option-badge{background:var(--cyan-primary);color:#060a12;border-color:var(--cyan-primary)}.data-table{width:100%;border-collapse:collapse;text-align:left}.data-table th{padding:12px 16px;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);border-bottom:1px solid var(--border-dim);background:#0003}.data-table 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rgba(168,85,247,.3);color:var(--violet-quest)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#060a12d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100;display:flex;align-items:center;justify-content:center;padding:20px}.modal-content{background:var(--bg-surface);border:1px solid var(--border-cyan);border-radius:var(--radius-lg);box-shadow:0 0 40px #00e5ff33;max-width:650px;width:100%;max-height:90vh;overflow-y:auto;padding:28px}.toast-container{position:fixed;bottom:24px;right:24px;display:flex;flex-direction:column;gap:10px;z-index:200}.toast-item{background:var(--bg-card);border:1px solid var(--border-cyan);box-shadow:var(--shadow-lg);border-radius:var(--radius-md);padding:14px 20px;display:flex;align-items:center;gap:12px;color:#fff;min-width:300px;animation:slideIn .25s ease-out}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}@media print{body{background:#fff!important;color:#000!important}.sidebar,.top-header,.btn,.no-print{display:none!important}.main-content{margin-left:0!important;padding-top:0!important}.card{border:1px solid #ccc!important;box-shadow:none!important;background:#fff!important;color:#000!important;page-break-inside:avoid}.data-table th{background:#f0f0f0!important;color:#000!important}.data-table td{color:#000!important}}@media(max-width:1024px){.sidebar{width:80px}.sidebar .nav-text,.brand-title span,.nav-section-label,.sidebar-footer{display:none}.sidebar-header{justify-content:center;padding:0}.main-content{margin-left:80px}.top-header{left:80px}.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(1,1fr)}}@media(max-width:768px){.top-header{padding:0 16px}.page-wrapper{padding:16px}.grid-2,.grid-4{grid-template-columns:1fr}}