:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --secondary: #0ea5e9;
            --dark: #0f172a;
            --light: #f8fafc;
            --text: #334155;
            --text-light: #64748b;
            --border: #e2e8f0;
            --success: #10b981;
            --warning: #f59e0b;
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
            --radius: 8px;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            color: var(--text);
            background: var(--light);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
        a:hover { color: var(--primary-dark); }
        
        /* Header */
        header {
            background: #fff;
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--dark);
        }
        .logo-icon {
            width: 36px; height: 36px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 0.9rem;
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 32px;
        }
        nav a {
            color: var(--text);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 4px 0;
            position: relative;
        }
        nav a:hover, nav a.active {
            color: var(--primary);
        }
        nav a.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 1px;
        }
        .header-actions {
            display: flex;
            gap: 12px;
            align-items: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            padding: 10px 20px;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            border: none;
            transition: all 0.2s;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 0 0 1px var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            box-shadow: 0 0 0 1px var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
        }
        .btn-sm { padding: 6px 14px; font-size: 0.85rem; }
        
        /* Mobile Menu */
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 4px;
        }
        .menu-toggle svg {
            width: 24px; height: 24px;
            stroke: var(--text);
        }
        
        /* Hero */
        .hero {
            background: linear-gradient(135deg, var(--dark) 0%, #1e293b 100%);
            color: #fff;
            padding: 100px 24px;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -50%; right: -10%;
            width: 600px; height: 600px;
            background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, transparent 70%);
            border-radius: 50%;
        }
        .hero-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            position: relative;
            z-index: 1;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.1);
            backdrop-filter: blur(10px);
            padding: 6px 16px;
            border-radius: 100px;
            font-size: 0.85rem;
            margin-bottom: 24px;
            border: 1px solid rgba(255,255,255,0.15);
        }
        .hero-badge .dot {
            width: 8px; height: 8px;
            background: var(--success);
            border-radius: 50%;
            animation: pulse 2s infinite;
        }
        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }
        .hero h1 {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .hero h1 span {
            background: linear-gradient(135deg, #60a5fa, #38bdf8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-desc {
            font-size: 1.15rem;
            color: #94a3b8;
            margin-bottom: 32px;
            max-width: 540px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-actions .btn {
            padding: 14px 28px;
            font-size: 1rem;
        }
        .hero-actions .btn-outline {
            color: #fff;
            box-shadow: 0 0 0 1px rgba(255,255,255,0.3);
        }
        .hero-actions .btn-outline:hover {
            background: rgba(255,255,255,0.1);
            color: #fff;
        }
        .hero-meta {
            display: flex;
            gap: 24px;
            margin-top: 40px;
            font-size: 0.85rem;
            color: #64748b;
        }
        .hero-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .hero-visual {
            background: rgba(255,255,255,0.03);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: 16px;
            padding: 32px;
            backdrop-filter: blur(10px);
        }
        .speed-card {
            background: rgba(15,23,42,0.6);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: 12px;
            padding: 20px;
            margin-bottom: 12px;
        }
        .speed-card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
        }
        .speed-label {
            font-size: 0.85rem;
            color: #94a3b8;
        }
        .speed-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
        }
        .speed-bar {
            height: 6px;
            background: rgba(255,255,255,0.1);
            border-radius: 3px;
            overflow: hidden;
        }
        .speed-bar-fill {
            height: 100%;
            border-radius: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            transition: width 1.5s ease-out;
        }
        
        /* Sections */
        .section {
            padding: 80px 24px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .section-header {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 60px;
        }
        .section-label {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(37,99,235,0.08);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 600;
            border-radius: 100px;
            margin-bottom: 16px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .section-title {
            font-size: 2.25rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }
        .section-desc {
            color: var(--text-light);
            font-size: 1.05rem;
            line-height: 1.7;
        }
        
        /* Features */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 32px;
            transition: all 0.3s;
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            transform: scaleX(0);
            transition: transform 0.3s;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .feature-card:hover::before {
            transform: scaleX(1);
        }
        .feature-icon {
            width: 48px; height: 48px;
            background: linear-gradient(135deg, rgba(37,99,235,0.1), rgba(14,165,233,0.1));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--primary);
        }
        .feature-icon svg {
            width: 24px; height: 24px;
        }
        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--dark);
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.6;
        }
        
        /* Test Modes */
        .modes-section {
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .modes-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .mode-card {
            background: var(--light);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 28px;
            text-align: center;
            transition: all 0.3s;
        }
        .mode-card:hover {
            border-color: var(--primary);
            background: #fff;
            box-shadow: var(--shadow);
        }
        .mode-tag {
            display: inline-block;
            padding: 4px 10px;
            background: var(--primary);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 700;
            border-radius: 6px;
            margin-bottom: 14px;
        }
        .mode-card h4 {
            font-size: 1.05rem;
            color: var(--dark);
            margin-bottom: 8px;
        }
        .mode-card p {
            font-size: 0.85rem;
            color: var(--text-light);
            line-height: 1.5;
        }
        
        /* Comparison */
        .compare-table-wrap {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
        }
        .compare-table th {
            background: var(--light);
            padding: 16px;
            text-align: left;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-light);
            text-transform: uppercase;
            letter-spacing: 0.03em;
            border-bottom: 1px solid var(--border);
        }
        .compare-table td {
            padding: 20px 16px;
            border-bottom: 1px solid var(--border);
            font-size: 0.95rem;
        }
        .compare-table tr:last-child td {
            border-bottom: none;
        }
        .compare-table .device {
            font-weight: 600;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .compare-table .badge {
            display: inline-block;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .badge-ssd { background: rgba(16,185,129,0.1); color: var(--success); }
        .badge-hdd { background: rgba(245,158,11,0.1); color: var(--warning); }
        .badge-nvme { background: rgba(37,99,235,0.1); color: var(--primary); }
        .speed-num {
            font-weight: 700;
            color: var(--dark);
            font-size: 1.1rem;
        }
        .speed-unit {
            font-size: 0.8rem;
            color: var(--text-light);
            margin-left: 2px;
        }
        
        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            text-align: center;
            padding: 80px 24px;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
        }
        .cta-inner {
            position: relative;
            z-index: 1;
            max-width: 640px;
            margin: 0 auto;
        }
        .cta-section h2 {
            font-size: 2.25rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            opacity: 0.9;
            margin-bottom: 32px;
        }
        .cta-section .btn {
            background: #fff;
            color: var(--primary);
            font-size: 1rem;
            padding: 14px 32px;
            box-shadow: var(--shadow-lg);
        }
        .cta-section .btn:hover {
            background: var(--light);
            transform: translateY(-2px);
        }
        
        /* Footer */
        footer {
            background: var(--dark);
            color: #94a3b8;
            padding: 60px 24px 30px;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 20px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col li {
            margin-bottom: 10px;
        }
        .footer-col a {
            color: #94a3b8;
            font-size: 0.9rem;
            transition: color 0.2s;
        }
        .footer-col a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
        }
        .footer-bottom a {
            color: #64748b;
        }
        
        /* Breadcrumb */
        .breadcrumb {
            max-width: 1200px;
            margin: 0 auto;
            padding: 16px 24px;
            font-size: 0.85rem;
            color: var(--text-light);
        }
        .breadcrumb a { color: var(--text-light); }
        .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb span { margin: 0 8px; color: var(--border); }
        
        /* Modal */
        .modal-overlay {
            position: fixed;
            inset: 0;
            background: rgba(15,23,42,0.6);
            backdrop-filter: blur(4px);
            z-index: 200;
            display: none;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity 0.3s;
        }
        .modal-overlay.active {
            display: flex;
            opacity: 1;
        }
        .modal {
            background: #fff;
            border-radius: 16px;
            max-width: 520px;
            width: 90%;
            max-height: 90vh;
            overflow-y: auto;
            box-shadow: var(--shadow-lg);
            transform: scale(0.95);
            transition: transform 0.3s;
        }
        .modal-overlay.active .modal {
            transform: scale(1);
        }
        .modal-header {
            padding: 24px 28px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .modal-header h3 {
            font-size: 1.25rem;
            color: var(--dark);
        }
        .modal-close {
            background: none;
            border: none;
            cursor: pointer;
            padding: 4px;
            color: var(--text-light);
            transition: color 0.2s;
        }
        .modal-close:hover { color: var(--dark); }
        .modal-body {
            padding: 20px 28px 28px;
        }
        .qr-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 16px;
        }
        .qr-item {
            text-align: center;
            padding: 20px;
            background: var(--light);
            border-radius: 12px;
            border: 1px solid var(--border);
        }
        .qr-item img {
            width: 140px;
            height: 140px;
            margin: 0 auto 12px;
            border-radius: 8px;
        }
        .qr-item p {
            font-size: 0.85rem;
            color: var(--text);
            font-weight: 500;
        }
        .qr-item span {
            display: block;
            font-size: 0.75rem;
            color: var(--text-light);
            margin-top: 4px;
        }
        .modal-note {
            margin-top: 20px;
            padding: 12px;
            background: rgba(245,158,11,0.08);
            border: 1px solid rgba(245,158,11,0.2);
            border-radius: 8px;
            font-size: 0.8rem;
            color: var(--warning);
        }
        
        /* Back to top */
        .back-to-top {
            position: fixed;
            bottom: 24px;
            right: 24px;
            width: 44px;
            height: 44px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: var(--shadow);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 50;
            color: var(--text);
        }
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        
        /* Responsive */
        @media (max-width: 1024px) {
            .hero-inner { grid-template-columns: 1fr; gap: 40px; }
            .hero h1 { font-size: 2.25rem; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .modes-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .menu-toggle { display: block; }
            nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 16px 24px; }
            nav.active { display: block; }
            nav ul { flex-direction: column; gap: 16px; }
            .hero { padding: 60px 24px; }
            .hero h1 { font-size: 1.875rem; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn { width: 100%; }
            .features-grid { grid-template-columns: 1fr; }
            .modes-grid { grid-template-columns: 1fr; }
            .compare-table-wrap { overflow-x: auto; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
            .section { padding: 60px 24px; }
            .section-title { font-size: 1.75rem; }
        }