:root{--primary: #6C47FF;--primary-dark: #5235D4;--primary-light: #8B6FFF;--accent: #FF6B35;--success: #22C55E;--danger: #EF4444;--warning: #F59E0B;--bg: #0A0A0F;--bg-card: #13131F;--bg-elevated: #1C1C2E;--border: #2A2A3E;--text: #F0F0FF;--text-muted: #8888AA;--text-dim: #5555777;--radius: 16px;--radius-sm: 8px;--shadow: 0 4px 24px rgba(108, 71, 255, .15)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:Space Grotesk,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased}h1,h2,h3{font-family:Sora,sans-serif}a{color:inherit;text-decoration:none}button{cursor:pointer;font-family:inherit;border:none;outline:none}input,select,textarea{font-family:inherit;outline:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:var(--radius-sm);font-size:15px;font-weight:600;transition:all .2s;cursor:pointer;border:none}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-outline{background:transparent;color:var(--text);border:1px solid var(--border)}.btn-outline:hover{border-color:var(--primary);color:var(--primary)}.btn-ghost{background:transparent;color:var(--text-muted)}.btn-ghost:hover{color:var(--text);background:var(--bg-elevated)}.btn-danger{background:var(--danger);color:#fff}.btn-success{background:var(--success);color:#fff}.btn-lg{padding:16px 32px;font-size:16px;border-radius:var(--radius)}.btn-sm{padding:8px 16px;font-size:13px}.btn-full{width:100%}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px}.input-field{width:100%;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 16px;color:var(--text);font-size:15px;transition:border-color .2s}.input-field:focus{border-color:var(--primary)}.input-field::placeholder{color:var(--text-muted)}.badge{display:inline-flex;align-items:center;padding:4px 10px;border-radius:100px;font-size:12px;font-weight:600}.badge-primary{background:#6c47ff33;color:var(--primary-light)}.badge-success{background:#22c55e33;color:var(--success)}.badge-danger{background:#ef444433;color:var(--danger)}.badge-warning{background:#f59e0b33;color:var(--warning)}.badge-muted{background:#8888aa26;color:var(--text-muted)}.loader{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;margin:auto}@keyframes spin{to{transform:rotate(360deg)}}.fade-in{animation:fadeIn .3s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--primary)}.desktop-only{display:flex!important}.mobile-only{display:none!important}@media (max-width: 768px){.desktop-only{display:none!important}.mobile-only{display:flex!important}}@media (max-width: 640px){.grid-2col-r,.grid-3col-r{grid-template-columns:1fr!important}.grid-4col-r{grid-template-columns:repeat(2,1fr)!important}.flex-col-mobile{flex-direction:column!important;align-items:flex-start!important}.header-row-r{flex-direction:column!important;align-items:flex-start!important;gap:12px!important}.container-r{padding:16px 12px!important}.overlay-r{padding:16px!important;align-items:flex-end!important}.paper-card-r{flex-direction:column!important;align-items:flex-start!important;gap:10px!important}.test-card-r{flex-direction:column!important;align-items:flex-start!important;gap:8px!important}.rev-card-r{flex-direction:column!important;align-items:flex-start!important;gap:10px!important}.rev-card-r>[style*=marginRight]{margin-right:0!important}.info-arrow-r{display:none!important}.test-banner-r{flex-wrap:wrap!important;gap:8px!important}}.nav-mobile-menu{position:absolute;top:100%;left:0;right:0;background:var(--bg-card);border-bottom:1px solid var(--border);padding:8px 16px 16px;display:flex;flex-direction:column;gap:4px;z-index:200;box-shadow:0 8px 24px #0006}.nav-mobile-menu .btn{width:100%;justify-content:flex-start;padding:10px 14px;border-radius:8px}.nav-mobile-divider{height:1px;background:var(--border);margin:6px 0}.test-page{height:100vh;height:100dvh;background:var(--bg);display:flex;flex-direction:column;overflow:hidden;overscroll-behavior:none}.test-header{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;background:var(--bg-card);border-bottom:1px solid var(--border);gap:12px;flex-shrink:0}.test-header-info{display:flex;flex-direction:column;min-width:0;flex:1}.test-header-title{font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.test-header-sub{color:var(--text-muted);font-size:12px}.test-body{display:flex;flex:1;min-height:0}.test-navigator{width:220px;flex-shrink:0;border-right:1px solid var(--border);padding:20px 16px;display:flex;flex-direction:column;gap:12px;overflow-y:auto}.test-main{flex:1;min-width:0;min-height:0;display:flex;flex-direction:column;overflow:hidden}.test-q-strip{display:none;overflow-x:auto;padding:10px 14px;gap:6px;border-bottom:1px solid var(--border);background:var(--bg-card);flex-shrink:0;flex-wrap:nowrap;-webkit-overflow-scrolling:touch;scrollbar-width:none}.test-q-strip::-webkit-scrollbar{display:none}.test-question-area{flex:1;min-height:0;padding:32px;display:flex;flex-direction:column;gap:24px;overflow-y:auto;-webkit-overflow-scrolling:touch}.test-nav-bar{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;gap:10px;border-top:1px solid var(--border);background:var(--bg-card);flex-shrink:0}.test-question-text{font-size:18px;line-height:1.7;font-weight:500;word-break:break-word;overflow-wrap:break-word}@media (max-width: 1024px){.test-navigator{display:none}.test-q-strip{display:flex}}@media (max-width: 768px){.test-header{padding:10px 14px;gap:8px}.test-header-title{font-size:13px}.test-question-area{padding:16px;gap:14px}.test-nav-bar{padding:10px 14px}.test-option{padding:12px 14px!important;gap:10px!important;align-items:flex-start!important}.test-question-text{font-size:16px!important;line-height:1.65!important}.test-option-label{width:30px!important;height:30px!important;font-size:13px!important;margin-top:1px;flex-shrink:0!important}}@media (max-width: 480px){.test-header{padding:8px 12px;gap:8px}.test-header-title{font-size:12px}.test-header-sub{display:none}.test-nav-bar{padding:10px 12px}.test-question-area{padding:14px 12px;gap:12px}.test-question-text{font-size:15px!important}.test-option{padding:11px 12px!important;gap:8px!important}.test-option-label{width:28px!important;height:28px!important;font-size:12px!important}}.ps-page{min-height:100vh;background:var(--bg)}.ps-container{max-width:900px;margin:0 auto;padding:32px 24px}.ps-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:24px;gap:16px}.ps-header-left{flex:1;min-width:0}.ps-title{font-weight:800;font-size:22px;word-break:break-word;overflow-wrap:break-word;font-family:Sora,sans-serif}.ps-meta{font-size:13px;color:var(--text-muted);margin-top:6px}.ps-timer{font-family:monospace;font-size:28px;font-weight:800;color:#6c47ff;background:var(--bg-card);padding:10px 18px;border-radius:12px;border:1px solid var(--border);flex-shrink:0}.ps-timer-red{color:#ff4d4f;border-color:#ff4d4f44;background:#ff4d4f11}.ps-progress{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}.ps-dot{width:36px;height:36px;border-radius:9px;border:1px solid;font-size:12px;font-weight:700;cursor:pointer;color:inherit;background:var(--bg-card);transition:all .15s}.ps-dot:hover{border-color:#6c47ff88}.ps-q-card{background:var(--bg-card);border:1px solid var(--border);border-radius:18px;padding:32px;margin-bottom:24px}.ps-q-num{font-size:12px;color:var(--text-muted);font-weight:700;text-transform:uppercase;letter-spacing:.5px;margin-bottom:16px}.ps-q-text{font-size:19px;font-weight:600;line-height:1.7;margin-bottom:28px;word-break:break-word;overflow-wrap:break-word}.ps-options{display:flex;flex-direction:column;gap:12px}.ps-opt{display:flex;align-items:flex-start;gap:14px;padding:16px 20px;background:var(--bg);border:1.5px solid var(--border);border-radius:14px;cursor:pointer;text-align:left;color:inherit;width:100%;transition:all .15s}.ps-opt:hover{border-color:#6c47ff88;background:#6c47ff08}.ps-opt-selected{border-color:#6c47ff!important;background:#6c47ff18!important}.ps-opt-label{width:32px;height:32px;border-radius:9px;background:#6c47ff33;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;flex-shrink:0;margin-top:1px}.ps-opt-selected .ps-opt-label{background:#6c47ff;color:#fff}.ps-opt-text{font-size:16px;flex:1;word-break:break-word;overflow-wrap:break-word;min-width:0;line-height:1.5}.ps-nav{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:4px 0}.ps-nav-count{color:var(--text-muted);font-size:13px;font-weight:600}.ps-result-card{background:var(--bg-card);border:1px solid var(--border);border-radius:20px;padding:40px 32px;max-width:720px;margin:0 auto}.ps-review-q{display:flex;gap:12px;padding:14px;border-radius:12px;border:1px solid;margin-bottom:10px}.ps-review-q-text{font-weight:600;font-size:15px;margin-bottom:6px;word-break:break-word}@media (max-width: 640px){.ps-page{overflow-x:hidden}.ps-container{padding:12px;max-width:100%}.ps-result-card{padding:16px 12px;border-radius:12px}.ps-review-q{padding:10px;gap:8px}.ps-review-q-text{font-size:13px}.ps-page-solving{height:100dvh;min-height:unset;display:flex;flex-direction:column;overflow:hidden}.ps-page-solving>nav{flex-shrink:0}.ps-page-solving .ps-container{flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden;padding:0;max-width:100%}.ps-page-solving .ps-header{flex-shrink:0;padding:10px 14px 8px;margin-bottom:0;gap:8px;border-bottom:1px solid var(--border)}.ps-page-solving .ps-title{font-size:15px}.ps-page-solving .ps-meta{font-size:11px}.ps-page-solving .ps-timer{font-size:18px;padding:5px 10px}.ps-page-solving .ps-progress{flex-shrink:0;flex-wrap:nowrap;overflow-x:auto;padding:8px 12px;gap:6px;margin-bottom:0;border-bottom:1px solid var(--border);background:var(--bg-card)}.ps-page-solving .ps-dot{width:30px;height:30px;font-size:11px;border-radius:7px;flex-shrink:0}.ps-page-solving .ps-q-card{flex:1;min-height:0;overflow-y:auto;border-radius:0;border-left:none;border-right:none;border-top:none;margin-bottom:0;padding:16px 14px}.ps-page-solving .ps-q-num{font-size:11px;margin-bottom:10px}.ps-page-solving .ps-q-text{font-size:16px;line-height:1.6;margin-bottom:16px}.ps-page-solving .ps-options{gap:8px}.ps-page-solving .ps-opt{padding:12px;gap:10px;border-radius:10px}.ps-page-solving .ps-opt-label{width:28px;height:28px;border-radius:7px;font-size:12px}.ps-page-solving .ps-opt-text{font-size:14px}.ps-page-solving .ps-nav{flex-shrink:0;padding:10px 14px;background:var(--bg-card);border-top:1px solid var(--border)}}