:root {
            --bg-color: #060812;
            --card-bg: rgba(15, 20, 38, 0.65);
            --card-hover: rgba(26, 33, 62, 0.85);
            --border-color: rgba(255, 255, 255, 0.08);
            --border-glow: rgba(99, 102, 241, 0.3);
            --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
            --btn-blue: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
            --accent-green: #10b981;
            --accent-purple: #c084fc;
            --accent-amber: #f59e0b;
            --accent-cyan: #22d3ee;
            --surface-elevated: rgba(22, 28, 50, 0.7);
            --glow-indigo: rgba(99, 102, 241, 0.25);
            --glow-pink: rgba(236, 72, 153, 0.2);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            overflow-x: hidden;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        .bg-grid {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background-image:
                radial-gradient(circle at 50% 15%, rgba(99, 102, 241, 0.18) 0%, transparent 45%),
                radial-gradient(circle at 85% 75%, rgba(236, 72, 153, 0.12) 0%, transparent 40%),
                radial-gradient(circle at 20% 60%, rgba(34, 211, 238, 0.06) 0%, transparent 35%),
                linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
            background-size: 100% 100%, 100% 100%, 100% 100%, 50px 50px, 50px 50px;
            z-index: -1;
            pointer-events: none;
        }

        header {
            position: sticky;
            top: 0;
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            background: rgba(6, 8, 18, 0.75);
            border-bottom: 1px solid var(--border-color);
            z-index: 100;
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 2rem;
        }

        .logo-wrapper {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            text-decoration: none;
        }

        .logo-svg {
            width: 38px;
            height: 38px;
            filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
            transition: filter 0.3s ease;
        }

        .logo-wrapper:hover .logo-svg {
            filter: drop-shadow(0 0 18px rgba(99, 102, 241, 0.8));
        }

        .logo-text {
            font-size: 1.6rem;
            font-weight: 800;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -0.5px;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            list-style: none;
        }

        .nav-links a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 0.95rem;
            font-weight: 500;
            transition: all 0.3s ease;
            position: relative;
            padding: 0.25rem 0;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-gradient);
            border-radius: 1px;
            transition: width 0.3s ease;
        }

        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-main);
            text-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        .hero {
            padding: 5rem 0 3rem;
            text-align: center;
            position: relative;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.45rem 1.2rem;
            border-radius: 50px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.12);
            font-size: 0.85rem;
            color: var(--accent-purple);
            margin-bottom: 2rem;
            backdrop-filter: blur(10px);
            box-shadow: 0 0 25px rgba(168, 85, 247, 0.2);
        }

        .badge-dot {
            width: 8px;
            height: 8px;
            background-color: #38bdf8;
            border-radius: 50%;
            box-shadow: 0 0 10px #38bdf8;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% {
                opacity: 0.5;
            }
            50% {
                opacity: 1;
                transform: scale(1.2);
            }
            100% {
                opacity: 0.5;
            }
        }

        .hero h1 {
            font-size: 4rem;
            font-weight: 900;
            line-height: 1.15;
            letter-spacing: -1.5px;
            margin-bottom: 1.5rem;
        }

        .gradient-text {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            font-size: 1.2rem;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 2.5rem;
        }

        .cta-group {
            display: flex;
            justify-content: center;
            gap: 1.2rem;
            margin-bottom: 4rem;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.9rem 2.4rem;
            border-radius: 50px;
            font-size: 1.05rem;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            cursor: pointer;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--btn-blue);
            color: #fff;
            box-shadow: 0 0 30px rgba(59, 130, 246, 0.5);
            border: none;
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 45px rgba(59, 130, 246, 0.8);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-main);
            border: 1px solid var(--border-color);
            backdrop-filter: blur(10px);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.3);
            transform: translateY(-3px);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            max-width: 800px;
            margin: 0 auto 5rem;
            padding: 2rem;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 24px;
            backdrop-filter: blur(16px);
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
        }

        .stat-item h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-main);
        }

        .stat-item p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 0.3rem;
        }

        .product-preview {
            max-width: 1000px;
            margin: 0 auto 6rem;
            padding: 1rem;
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid var(--border-color);
            border-radius: 28px;
            box-shadow: 0 30px 100px rgba(0, 0, 0, 0.7);
        }

        .preview-window {
            width: 100%;
            height: 480px;
            background: #0d1120;
            border-radius: 20px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        .window-header {
            height: 44px;
            background: rgba(0, 0, 0, 0.3);
            padding: 0 1.2rem;
            display: flex;
            align-items: center;
            gap: 8px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
        }

        .dot-red {
            background: #ff5f56;
        }
        .dot-yellow {
            background: #ffbd2e;
        }
        .dot-green {
            background: #27c93f;
        }

        .window-title {
            margin: 0 auto;
            font-size: 0.85rem;
            color: var(--text-muted);
            letter-spacing: 0.5px;
        }

        .window-content {
            flex: 1;
            display: grid;
            grid-template-columns: 260px 1fr;
            height: calc(100% - 44px);
        }

        .chat-sidebar {
            background: rgba(0, 0, 0, 0.2);
            border-right: 1px solid rgba(255, 255, 255, 0.05);
            padding: 1rem;
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }

        .sidebar-item {
            padding: 0.8rem;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.03);
            font-size: 0.85rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .sidebar-item.active {
            background: rgba(99, 102, 241, 0.15);
            border: 1px solid rgba(99, 102, 241, 0.3);
            color: var(--text-main);
        }

        .chat-main {
            padding: 1.5rem;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            background: radial-gradient(circle at center, rgba(99, 102, 241, 0.05) 0%, transparent 70%);
        }

        .chat-bubbles {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .bubble {
            max-width: 70%;
            padding: 0.8rem 1.2rem;
            border-radius: 16px;
            font-size: 0.9rem;
        }

        .bubble-left {
            background: rgba(255, 255, 255, 0.06);
            align-self: flex-start;
            border-bottom-left-radius: 4px;
        }

        .bubble-right {
            background: var(--btn-blue);
            align-self: flex-end;
            border-bottom-right-radius: 4px;
        }

        .section-title {
            text-align: center;
            margin-bottom: 3.5rem;
        }

        .section-title h2 {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 0.8rem;
        }

        .section-title p {
            color: var(--text-muted);
            font-size: 1.1rem;
        }

        /* ========== 特性卡片 ========== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-bottom: 8rem;
        }

        .feature-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 2.2rem;
            border-radius: 20px;
            backdrop-filter: blur(12px);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at 30% 20%, rgba(99, 102, 241, 0.06) 0%, transparent 55%);
            opacity: 0;
            transition: opacity 0.4s ease;
            pointer-events: none;
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            border-color: var(--border-glow);
            box-shadow: 0 15px 40px rgba(99, 102, 241, 0.15);
            background: var(--card-hover);
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            background: rgba(99, 102, 241, 0.1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: #818cf8;
            position: relative;
            z-index: 1;
        }

        .feature-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            position: relative;
            z-index: 1;
        }

        .feature-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
            position: relative;
            z-index: 1;
        }

        /* ========== 隐私场景创意版块 ========== */
        .scenarios-section {
            margin-bottom: 8rem;
        }

        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }

        .scenario-card {
            background: var(--surface-elevated);
            border: 1px solid var(--border-color);
            border-radius: 18px;
            padding: 2rem 1.5rem;
            text-align: center;
            transition: all 0.35s ease;
            position: relative;
            overflow: hidden;
            cursor: default;
        }

        .scenario-card::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: 18px;
            background: linear-gradient(180deg, transparent 0%, rgba(99, 102, 241, 0.04) 100%);
            pointer-events: none;
            transition: opacity 0.35s ease;
            opacity: 0;
        }

        .scenario-card:hover::after {
            opacity: 1;
        }
        .scenario-card:hover {
            border-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-6px);
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px var(--glow-indigo);
        }

        .scenario-icon-wrap {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            margin: 0 auto 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: all 0.35s ease;
        }

        .scenario-card:hover .scenario-icon-wrap {
            background: rgba(99, 102, 241, 0.12);
            border-color: rgba(99, 102, 241, 0.4);
            box-shadow: 0 0 20px var(--glow-indigo);
        }

        .scenario-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--text-main);
        }

        .scenario-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ========== 对比表格 ========== */
        .comparison-section {
            margin-bottom: 8rem;
        }

        .table-wrapper {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            overflow: hidden;
            backdrop-filter: blur(12px);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        th,
        td {
            padding: 1.2rem 1.8rem;
            border-bottom: 1px solid var(--border-color);
        }

        th {
            background: rgba(0, 0, 0, 0.4);
            font-size: 1rem;
            color: var(--text-main);
        }

        td {
            font-size: 0.95rem;
            color: var(--text-muted);
        }

        tr:last-child td {
            border-bottom: none;
        }

        .check-icon {
            color: var(--accent-green);
            font-weight: bold;
        }

        .cross-icon {
            color: #ef4444;
            font-weight: bold;
        }

        /* ========== 步骤区域 ========== */
        .steps-section {
            margin-bottom: 8rem;
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }

        .step-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 2rem 1.5rem;
            border-radius: 18px;
            position: relative;
            transition: all 0.3s ease;
        }

        .step-card:hover {
            border-color: rgba(255, 255, 255, 0.18);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
            transform: translateY(-3px);
        }

        .step-number {
            font-size: 2.5rem;
            font-weight: 900;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 1rem;
        }

        .step-card h4 {
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
        }

        .step-card p {
            font-size: 0.88rem;
            color: var(--text-muted);
        }

        /* ========== 信任基石创意版块 ========== */
        .trust-section {
            margin-bottom: 8rem;
        }

        .trust-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .trust-card {
            background: var(--surface-elevated);
            border: 1px solid transparent;
            border-image: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(236, 72, 153, 0.3)) 1;
            border-radius: 20px;
            padding: 2.5rem 2rem;
            text-align: center;
            backdrop-filter: blur(10px);
            transition: all 0.4s ease;
            position: relative;
        }

        .trust-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 25px 60px rgba(0, 0, 0, 0.55), 0 0 35px var(--glow-pink);
            border-image: linear-gradient(135deg, rgba(99, 102, 241, 0.6), rgba(236, 72, 153, 0.6)) 1;
        }

        .trust-badge {
            display: inline-block;
            font-size: 2.8rem;
            font-weight: 900;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 0.8rem;
            letter-spacing: -1px;
        }

        .trust-card h4 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.6rem;
            color: var(--text-main);
        }

        .trust-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ========== CTA ========== */
        .cta-box {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(236, 72, 153, 0.15) 100%);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 28px;
            padding: 4rem 2rem;
            text-align: center;
            margin-bottom: 6rem;
            backdrop-filter: blur(20px);
        }

        .cta-box h2 {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 1rem;
        }

        .cta-box p {
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 2rem;
            font-size: 1.05rem;
        }

        /* ========== Footer ========== */
        footer {
            border-top: 1px solid var(--border-color);
            padding: 4rem 2rem 2rem;
            background: rgba(4, 6, 14, 0.9);
            color: var(--text-muted);
        }

        .footer-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr repeat(3, 1fr);
            gap: 3rem;
            margin-bottom: 3rem;
        }

        .footer-brand p {
            font-size: 0.9rem;
            margin-top: 1rem;
            max-width: 320px;
        }

        .footer-column h5 {
            color: var(--text-main);
            font-size: 1rem;
            margin-bottom: 1.2rem;
        }

        .footer-column ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }

        .footer-column a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s ease;
        }

        .footer-column a:hover {
            color: var(--text-main);
        }

        .footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 992px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .scenarios-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .trust-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.8rem;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .scenarios-grid {
                grid-template-columns: 1fr;
            }
            .trust-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .cta-group {
                flex-direction: column;
                align-items: center;
            }
            .window-content {
                grid-template-columns: 1fr;
            }
            .chat-sidebar {
                display: none;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 1rem;
                text-align: center;
            }
            .nav-links {
                gap: 1rem;
                font-size: 0.85rem;
            }
        }

        @media (max-width: 480px) {
            .hero h1 {
                font-size: 2rem;
            }
            .nav-container {
                padding: 0.8rem 1rem;
            }
            .nav-links {
                gap: 0.6rem;
            }
            .nav-links a {
                font-size: 0.78rem;
            }
            .container {
                padding: 0 1rem;
            }
        }