@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+SC:wght@400;500;700&display=swap";
:root{--bg-primary:#0b1120;--bg-secondary:#111827;--bg-card:#1a2332;--bg-card-hover:#1e2a3a;--bg-input:#1e293b;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#64748b;--accent-blue:#3b82f6;--accent-blue-light:#60a5fa;--accent-amber:#f59e0b;--accent-amber-light:#fbbf24;--accent-emerald:#10b981;--accent-red:#ef4444;--accent-purple:#a855f7;--border-color:#1e3a5f;--border-card:#253449;--gradient-blue:linear-gradient(135deg, #3b82f6, #1d4ed8);--gradient-amber:linear-gradient(135deg, #f59e0b, #d97706);--gradient-hero:linear-gradient(180deg, #0b1120 0%, #111827 100%);--shadow-card:0 4px 24px #0000004d;--shadow-glow-blue:0 0 20px #3b82f626;--shadow-glow-amber:0 0 20px #f59e0b26;--realm-pham-nhan:#94a3b8;--realm-luyen-khi:#60a5fa;--realm-truc-co:#34d399;--realm-kim-dan:#fbbf24;--realm-nguyen-anh:#a855f7;--realm-hoa-than:#ef4444;--realm-dai-thanh:#f97316;--linh-can-hoa:#ef4444;--linh-can-thuy:#3b82f6;--linh-can-moc:#22c55e;--linh-can-kim:#fbbf24;--linh-can-tho:#a16207;--radius:12px;--radius-sm:8px;--radius-lg:16px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.6}a{color:var(--accent-blue-light);text-decoration:none;transition:color .2s}a:hover{color:var(--accent-amber)}.app-layout{min-height:100vh;display:flex}.sidebar-wrap{z-index:200;width:260px;height:100vh;transition:transform .3s cubic-bezier(.4,0,.2,1);position:fixed;top:0;left:0}.sidebar{background:var(--bg-secondary);border-right:1px solid var(--border-card);z-index:200;flex-direction:column;width:260px;height:100vh;padding:24px 0;transition:transform .3s;display:flex}.sidebar.hidden,.sidebar-wrap.hidden{pointer-events:none;transform:translate(-100%)}.sidebar-toggle{z-index:300;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);color:#e2e8f0;cursor:pointer;background:#0f172ad9;border:1px solid #ffffff26;border-radius:8px;justify-content:center;align-items:center;width:36px;height:36px;font-size:1.1rem;transition:all .2s;display:none;position:fixed;top:8px;left:8px;box-shadow:0 4px 12px #0000004d}.sidebar-toggle.hidden{display:none!important}.sidebar-toggle:hover{background:#3b82f64d;border-color:#3b82f680}.sidebar-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:150;background:#0009;display:none;position:fixed;inset:0}.sidebar-logo{border-bottom:1px solid var(--border-card);margin-bottom:8px;padding:0 24px 24px}.sidebar-logo h1{background:linear-gradient(135deg, var(--accent-blue-light), var(--accent-amber));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:1.2rem;font-weight:800}.sidebar-logo span{color:var(--text-muted);margin-top:2px;font-size:.7rem;display:block}.sidebar-nav{flex:1;padding:8px 12px;overflow-y:auto}.sidebar-nav a{border-radius:var(--radius-sm);color:var(--text-secondary);align-items:center;gap:12px;padding:10px 16px;font-size:.9rem;font-weight:500;transition:all .2s;display:flex}.sidebar-nav a:hover{background:var(--bg-card);color:var(--text-primary)}.sidebar-nav a.active{color:var(--accent-blue-light);background:#3b82f61a;border:1px solid #3b82f633}.sidebar-nav a .nav-icon{text-align:center;width:24px;font-size:1.1rem}.sidebar-user{border-top:1px solid var(--border-card);align-items:center;gap:12px;padding:16px 20px;display:flex}.sidebar-user .user-avatar{background:var(--gradient-blue);border-radius:50%;justify-content:center;align-items:center;width:36px;height:36px;font-size:.85rem;font-weight:700;display:flex}.sidebar-user .user-info{flex:1}.sidebar-user .user-name{font-size:.85rem;font-weight:600}.sidebar-user .user-realm{color:var(--text-muted);font-size:.7rem}.main-content{flex:1;max-width:1200px;margin-left:260px;padding:32px 40px}.card{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius);padding:24px;transition:all .3s}.card:hover{border-color:var(--border-color);box-shadow:var(--shadow-card)}.card-glow-blue:hover{box-shadow:var(--shadow-glow-blue);border-color:#3b82f64d}.card-glow-amber:hover{box-shadow:var(--shadow-glow-amber);border-color:#f59e0b4d}.btn{border-radius:var(--radius-sm);cursor:pointer;border:none;justify-content:center;align-items:center;gap:8px;padding:10px 24px;font-family:inherit;font-size:.9rem;font-weight:600;transition:all .2s;display:inline-flex}.btn-primary{background:var(--gradient-blue);color:#fff}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 16px #3b82f64d}.btn-amber{background:var(--gradient-amber);color:#1a1a2e}.btn-amber:hover{transform:translateY(-1px);box-shadow:0 4px 16px #f59e0b4d}.btn-outline{border:1px solid var(--border-color);color:var(--text-secondary);background:0 0}.btn-outline:hover{border-color:var(--accent-blue);color:var(--accent-blue-light);background:#3b82f60d}.btn-lg{padding:14px 32px;font-size:1rem}.btn-sm{padding:6px 14px;font-size:.8rem}.progress-bar{background:var(--bg-input);border-radius:100px;width:100%;height:8px;overflow:hidden}.progress-fill{background:var(--gradient-blue);border-radius:100px;height:100%;transition:width .5s}.progress-fill.amber{background:var(--gradient-amber)}.stat-grid{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.stat-item{text-align:center;padding:16px}.stat-value{color:var(--accent-blue-light);font-size:1.5rem;font-weight:800}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-top:4px;font-size:.75rem}.badge{border-radius:100px;align-items:center;gap:4px;padding:4px 12px;font-size:.75rem;font-weight:600;display:inline-flex}.badge-realm{color:var(--accent-blue-light);background:#3b82f61a;border:1px solid #3b82f633}.badge-linh-can{color:#4ade80;background:#22c55e1a;border:1px solid #22c55e33}.quiz-option{background:var(--bg-input);border:1px solid var(--border-card);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);cursor:pointer;text-align:left;padding:14px 20px;font-family:inherit;font-size:.9rem;transition:all .2s;display:block}.quiz-option:hover{border-color:var(--accent-blue);background:#3b82f60d}.quiz-option.correct{border-color:var(--accent-emerald);color:var(--accent-emerald);background:#10b9811a}.quiz-option.wrong{border-color:var(--accent-red);color:var(--accent-red);background:#ef44441a}.quiz-option.selected{border-color:var(--accent-blue);background:#3b82f61a}.exp-popup{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow-glow-amber);z-index:1000;border:1px solid #f59e0b4d;padding:16px 24px;animation:.3s slideIn,.3s 2.7s fadeOut;position:fixed;top:20px;right:20px}.exp-popup .exp-text{color:var(--accent-amber);font-size:1.1rem;font-weight:700}@keyframes slideIn{0%{opacity:0;transform:translate(100px)}to{opacity:1;transform:translate(0)}}@keyframes fadeOut{0%{opacity:1}to{opacity:0}}@media (max-width:768px){.sidebar-toggle{display:flex}.sidebar-overlay{display:block}.sidebar-wrap{transform:translate(-100%)}.sidebar-wrap.open{transform:translate(0)}.main-content{margin-left:0;padding:20px 16px}.page-title{margin-left:44px;font-size:1.1rem}.flex-between{flex-wrap:wrap;gap:8px}.stat-grid{grid-template-columns:repeat(2,1fr)}}@media (max-height:500px){.battle-layout{flex-direction:row!important;height:100vh!important}.battle-game{flex:1!important}.battle-panel{border-top:none!important;border-left:1px solid var(--border-card)!important;width:280px!important;max-height:100vh!important}.battle-panel .quiz-option{padding:6px 10px!important;font-size:.75rem!important}}.page-title{margin-bottom:24px;font-size:1.5rem;font-weight:800}.section-title{color:var(--text-primary);margin-bottom:16px;font-size:1.1rem;font-weight:700}.text-muted{color:var(--text-muted)}.text-amber{color:var(--accent-amber)}.text-blue{color:var(--accent-blue-light)}.text-emerald{color:var(--accent-emerald)}.flex-between{justify-content:space-between;align-items:center;display:flex}.gap-sm{gap:8px}.gap-md{gap:16px}.gap-lg{gap:24px}.mt-sm{margin-top:8px}.mt-md{margin-top:16px}.mt-lg{margin-top:24px}.mb-md{margin-bottom:16px}.quiz-question pre{background:var(--bg-primary);border-radius:var(--radius-md);border:1px solid var(--border-card);margin-top:12px;margin-bottom:12px;padding:12px 16px;font-size:.85rem;line-height:1.5;overflow-x:auto}.quiz-question code{font-family:monospace}.quiz-question code:not(pre code){color:#38bdf8;background:#ffffff1a;border-radius:4px;padding:2px 6px;font-size:.9em}