:root {
            --bg-deep: #060b14;
            --bg-surface: rgba(14, 22, 40, 0.75);
            --bg-elevated: rgba(20, 32, 56, 0.8);
            --accent-sky: #38bdf8;
            --accent-glow: rgba(56, 189, 248, 0.28);
            --accent-purple: #a78bfa;
            --accent-purple-glow: rgba(167, 139, 250, 0.22);
            --accent-emerald: #34d399;
            --accent-emerald-glow: rgba(52, 211, 153, 0.2);
            --text-primary: #edf2f9;
            --text-secondary: #b0bec5;
            --text-tertiary: #6b7c93;
            --border-subtle: rgba(255, 255, 255, 0.07);
            --border-active: rgba(56, 189, 248, 0.45);
            --border-purple: rgba(167, 139, 250, 0.3);
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 22px;
            --radius-xl: 28px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.35);
            --shadow-glow-sky: 0 0 40px rgba(56, 189, 248, 0.18);
            --shadow-glow-purple: 0 0 40px rgba(167, 139, 250, 0.14);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-primary);
            background-color: var(--bg-deep);
            line-height: 1.65;
            overflow-x: hidden;
            letter-spacing: 0.01em;
        }

        /* 动态背景光晕层 */
        .ambient-glow-layer {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
            overflow: hidden;
        }
        .ambient-orb {
            position: absolute;
            border-radius: 50%;
            filter: blur(120px);
            opacity: 0.14;
            animation: orbDrift 18s ease-in-out infinite;
        }
        .ambient-orb.orb-sky {
            width: 700px;
            height: 700px;
            background: radial-gradient(circle, rgba(56, 189, 248, 0.55) 0%, transparent 70%);
            top: -250px;
            right: -180px;
            animation-delay: 0s;
        }
        .ambient-orb.orb-purple {
            width: 550px;
            height: 550px;
            background: radial-gradient(circle, rgba(167, 139, 250, 0.45) 0%, transparent 70%);
            bottom: -200px;
            left: -160px;
            animation-delay: -7s;
        }
        .ambient-orb.orb-emerald {
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(52, 211, 153, 0.35) 0%, transparent 70%);
            top: 40%;
            left: 55%;
            animation-delay: -13s;
        }

        @keyframes orbDrift {
            0%,
            100% {
                transform: translate(0, 0) scale(1);
            }
            20% {
                transform: translate(60px, -40px) scale(1.08);
            }
            40% {
                transform: translate(-30px, 50px) scale(0.94);
            }
            60% {
                transform: translate(-55px, -25px) scale(1.05);
            }
            80% {
                transform: translate(40px, 35px) scale(0.96);
            }
        }

        /* 微妙的网格纹理 */
        .grid-texture {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
            opacity: 0.025;
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
            background-size: 52px 52px;
        }

        /* 头部导航 */
        header {
            background: rgba(6, 11, 20, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: background 0.35s ease;
        }
        header.scrolled {
            background: rgba(6, 11, 20, 0.94);
            box-shadow: 0 2px 24px rgba(0, 0, 0, 0.45);
        }

        .nav-container {
            max-width: 1260px;
            margin: 0 auto;
            padding: 1.1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1.5rem;
        }

        .logo {
            font-size: 1.55rem;
            font-weight: 800;
            color: #ffffff;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.7rem;
            letter-spacing: -0.4px;
            white-space: nowrap;
            transition: opacity 0.2s;
        }
        .logo:hover {
            opacity: 0.88;
        }
        .logo svg {
            width: 34px;
            height: 34px;
            fill: none;
            stroke: var(--accent-sky);
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
            filter: drop-shadow(0 0 10px var(--accent-glow));
            transition: filter 0.3s;
        }
        .logo:hover svg {
            filter: drop-shadow(0 0 18px var(--accent-glow));
        }

        .nav-links {
            display: flex;
            gap: 2.2rem;
            list-style: none;
            align-items: center;
            flex-wrap: wrap;
        }
        .nav-links a {
            text-decoration: none;
            color: var(--text-secondary);
            font-weight: 540;
            font-size: 0.93rem;
            transition: all 0.25s;
            position: relative;
            padding: 0.35rem 0;
            white-space: nowrap;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-sky);
            border-radius: 2px;
            transition: width 0.28s ease;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: #ffffff;
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }
        .nav-links a.active {
            color: var(--accent-sky);
        }

        /* 移动端导航 */
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 0.5rem;
            z-index: 101;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            margin: 6px 0;
            border-radius: 2px;
            transition: 0.3s;
        }

        @media (max-width: 860px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(6, 11, 20, 0.96);
                backdrop-filter: blur(20px);
                flex-direction: column;
                gap: 0;
                padding: 1rem 0;
                border-bottom: 1px solid var(--border-subtle);
                box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                padding: 1rem 2rem;
                width: 100%;
                border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            }
            .nav-links a::after {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
            .hero h1 {
                font-size: 2rem !important;
            }
            .hero p {
                font-size: 1rem !important;
            }
            .section-title {
                font-size: 1.7rem !important;
            }
        }

        /* Hero 区域 */
        .hero {
            position: relative;
            padding: 6rem 2rem 5rem 2rem;
            text-align: center;
            z-index: 1;
        }
        .hero-container {
            max-width: 820px;
            margin: 0 auto;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.55rem;
            padding: 0.45rem 1.15rem;
            border-radius: 9999px;
            background: rgba(56, 189, 248, 0.07);
            border: 1px solid rgba(56, 189, 248, 0.22);
            color: var(--accent-sky);
            font-size: 0.84rem;
            font-weight: 600;
            margin-bottom: 2.2rem;
            letter-spacing: 0.3px;
            animation: badgePulse 3s ease-in-out infinite;
        }
        @keyframes badgePulse {
            0%,
            100% {
                box-shadow: 0 0 0 rgba(56, 189, 248, 0);
            }
            50% {
                box-shadow: 0 0 22px rgba(56, 189, 248, 0.25);
            }
        }
        .hero-badge svg {
            width: 15px;
            height: 15px;
            stroke: var(--accent-sky);
            fill: none;
            stroke-width: 2;
        }
        .hero h1 {
            font-size: 3.3rem;
            font-weight: 850;
            margin-bottom: 1.4rem;
            line-height: 1.18;
            background: linear-gradient(140deg, #ffffff 0%, #cbd5e1 45%, #94a3b8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.8px;
        }
        .hero p {
            font-size: 1.18rem;
            color: var(--text-secondary);
            margin-bottom: 2.8rem;
            max-width: 660px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
        }
        .cta-group {
            display: flex;
            justify-content: center;
            gap: 1.2rem;
            flex-wrap: wrap;
            margin-bottom: 3.2rem;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.9rem 2.1rem;
            font-size: 0.98rem;
            font-weight: 620;
            border-radius: var(--radius-sm);
            text-decoration: none;
            transition: all var(--transition-smooth);
            cursor: pointer;
            letter-spacing: 0.2px;
        }
        .btn-primary {
            background: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 60%, #0284c7 100%);
            color: #041018;
            box-shadow: 0 0 28px var(--accent-glow);
            border: none;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 42px rgba(56, 189, 248, 0.5);
        }
        .btn-secondary {
            background: rgba(255, 255, 255, 0.04);
            color: #ffffff;
            border: 1px solid var(--border-subtle);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.22);
            transform: translateY(-3px);
        }
        .btn-outline-accent {
            background: transparent;
            color: var(--accent-sky);
            border: 1px solid rgba(56, 189, 248, 0.35);
        }
        .btn-outline-accent:hover {
            background: rgba(56, 189, 248, 0.08);
            border-color: var(--accent-sky);
            box-shadow: 0 0 20px rgba(56, 189, 248, 0.2);
            transform: translateY(-3px);
        }

        .trust-strip {
            display: flex;
            justify-content: center;
            gap: 2.2rem;
            font-size: 0.88rem;
            color: var(--text-tertiary);
            flex-wrap: wrap;
        }
        .trust-strip span {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            letter-spacing: 0.2px;
        }
        .trust-strip svg {
            width: 17px;
            height: 17px;
            stroke: var(--accent-sky);
            fill: none;
            stroke-width: 2;
            flex-shrink: 0;
        }

        /* 通用区块 */
        .section-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 5.5rem 2rem;
            position: relative;
            z-index: 1;
        }
        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }
        .section-subtitle {
            color: var(--accent-sky);
            font-size: 0.84rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.8px;
            margin-bottom: 0.55rem;
            display: block;
        }
        .section-title {
            font-size: 2.35rem;
            font-weight: 750;
            color: #ffffff;
            letter-spacing: -0.4px;
        }
        .section-desc {
            color: var(--text-secondary);
            font-size: 1.02rem;
            margin-top: 0.8rem;
            max-width: 620px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.6;
        }

        /* 功能卡片网格 */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(268px, 1fr));
            gap: 1.6rem;
        }
        .feature-card {
            background: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 2.2rem 1.9rem;
            transition: all var(--transition-smooth);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            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(56, 189, 248, 0.04) 0%, transparent 55%);
            pointer-events: none;
            transition: opacity 0.4s;
            opacity: 0;
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-card:hover {
            background: var(--bg-elevated);
            border-color: var(--border-active);
            transform: translateY(-6px);
            box-shadow: var(--shadow-card), var(--shadow-glow-sky);
        }
        .feature-icon {
            width: 50px;
            height: 50px;
            border-radius: 13px;
            background: rgba(56, 189, 248, 0.09);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            transition: background 0.3s;
        }
        .feature-card:hover .feature-icon {
            background: rgba(56, 189, 248, 0.16);
        }
        .feature-icon svg {
            width: 26px;
            height: 26px;
            stroke: var(--accent-sky);
            fill: none;
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }
        .feature-card h3 {
            font-size: 1.22rem;
            color: #ffffff;
            margin-bottom: 0.7rem;
            font-weight: 650;
            letter-spacing: -0.2px;
        }
        .feature-card p {
            color: var(--text-secondary);
            font-size: 0.94rem;
            line-height: 1.65;
        }

        /* 加密流程展示板块 */
        .encryption-flow {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1.4rem;
            align-items: start;
        }
        .flow-step {
            background: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 1.8rem 1.6rem;
            text-align: center;
            transition: all var(--transition-smooth);
            position: relative;
            backdrop-filter: blur(10px);
        }
        .flow-step:hover {
            border-color: var(--border-purple);
            box-shadow: var(--shadow-glow-purple);
            transform: translateY(-4px);
        }
        .flow-step-num {
            display: inline-block;
            width: 44px;
            height: 44px;
            line-height: 44px;
            border-radius: 50%;
            background: rgba(167, 139, 250, 0.13);
            color: var(--accent-purple);
            font-weight: 800;
            font-size: 1.2rem;
            margin-bottom: 1rem;
            letter-spacing: 0;
        }
        .flow-step h4 {
            color: #ffffff;
            font-size: 1.08rem;
            margin-bottom: 0.55rem;
            font-weight: 650;
        }
        .flow-step p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.55;
        }

        /* 对比表格 */
        .compare-table-wrap {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-subtle);
            background: var(--bg-surface);
            backdrop-filter: blur(10px);
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 680px;
            font-size: 0.94rem;
        }
        .compare-table th,
        .compare-table td {
            padding: 1.1rem 1.4rem;
            text-align: left;
            border-bottom: 1px solid var(--border-subtle);
        }
        .compare-table th {
            background: rgba(255, 255, 255, 0.03);
            color: #ffffff;
            font-weight: 650;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .compare-table td {
            color: var(--text-secondary);
        }
        .compare-table .highlight-col {
            color: var(--accent-emerald);
            font-weight: 600;
        }
        .compare-table .check-icon {
            display: inline-block;
            width: 20px;
            height: 20px;
            color: var(--accent-emerald);
            font-weight: 700;
        }
        .compare-table .cross-icon {
            display: inline-block;
            width: 20px;
            height: 20px;
            color: #ef4444;
            font-weight: 700;
        }

        /* 场景卡片 */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
            gap: 1.6rem;
        }
        .case-card {
            background: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 2rem 1.8rem;
            border-left: 5px solid var(--accent-sky);
            transition: all var(--transition-smooth);
            backdrop-filter: blur(10px);
        }
        .case-card:hover {
            border-left-color: var(--accent-purple);
            box-shadow: var(--shadow-card);
            transform: translateX(3px);
        }
        .case-card h3 {
            font-size: 1.18rem;
            color: #ffffff;
            margin-bottom: 0.7rem;
            font-weight: 650;
        }
        .case-card p {
            color: var(--text-secondary);
            font-size: 0.93rem;
            line-height: 1.6;
        }

        /* FAQ */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 1.1rem;
        }
        .faq-item {
            background: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 1.7rem 1.8rem;
            transition: all var(--transition-smooth);
            cursor: default;
        }
        .faq-item:hover {
            border-color: var(--border-active);
            box-shadow: var(--shadow-glow-sky);
        }
        .faq-item h3 {
            font-size: 1.08rem;
            color: #ffffff;
            margin-bottom: 0.7rem;
            display: flex;
            align-items: flex-start;
            gap: 0.7rem;
            font-weight: 620;
        }
        .faq-item h3::before {
            content: "Q";
            display: inline-block;
            color: var(--accent-sky);
            font-weight: 800;
            font-size: 1.1rem;
            flex-shrink: 0;
            line-height: 1.3;
        }
        .faq-item p {
            color: var(--text-secondary);
            font-size: 0.93rem;
            padding-left: 1.9rem;
            line-height: 1.6;
        }

        /* 信任数据创意板块 */
        .stats-mini-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 1.4rem;
            text-align: center;
        }
        .stat-mini-card {
            background: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 2rem 1.4rem;
            backdrop-filter: blur(10px);
            transition: all var(--transition-smooth);
        }
        .stat-mini-card:hover {
            border-color: var(--border-active);
            box-shadow: var(--shadow-glow-sky);
            transform: translateY(-5px);
        }
        .stat-number {
            font-size: 2.6rem;
            font-weight: 850;
            letter-spacing: -1px;
            background: linear-gradient(135deg, var(--accent-sky) 0%, var(--accent-purple) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.3rem;
        }
        .stat-label {
            color: var(--text-secondary);
            font-size: 0.9rem;
            letter-spacing: 0.3px;
        }

        /* CTA横幅 */
        .cta-banner {
            background: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 3rem 2.5rem;
            text-align: center;
            backdrop-filter: blur(12px);
            position: relative;
            overflow: hidden;
            max-width: 900px;
            margin: 0 auto;
        }
        .cta-banner::before {
            content: '';
            position: absolute;
            top: -60%;
            left: -60%;
            width: 220%;
            height: 220%;
            background: radial-gradient(circle at 40% 50%, rgba(56, 189, 248, 0.06) 0%, transparent 60%);
            pointer-events: none;
        }
        .cta-banner h3 {
            font-size: 1.7rem;
            color: #ffffff;
            margin-bottom: 0.8rem;
            position: relative;
            font-weight: 700;
        }
        .cta-banner p {
            color: var(--text-secondary);
            margin-bottom: 2rem;
            position: relative;
            font-size: 1rem;
        }

        /* 页脚 */
        footer {
            background: rgba(4, 8, 16, 0.92);
            color: var(--text-tertiary);
            padding: 4rem 2rem 2.2rem 2rem;
            border-top: 1px solid var(--border-subtle);
            position: relative;
            z-index: 1;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 2.2rem;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            justify-content: center;
        }
        .footer-links a {
            color: var(--text-tertiary);
            text-decoration: none;
            font-size: 0.88rem;
            transition: color 0.25s;
            letter-spacing: 0.2px;
        }
        .footer-links a:hover {
            color: var(--accent-sky);
        }
        .footer-copyright {
            text-align: center;
            font-size: 0.83rem;
            border-top: 1px solid var(--border-subtle);
            padding-top: 2rem;
            color: #556278;
            letter-spacing: 0.3px;
        }

        @media (max-width: 600px) {
            .hero {
                padding: 4rem 1.2rem 2.5rem 1.2rem;
            }
            .hero h1 {
                font-size: 1.75rem !important;
            }
            .section-container {
                padding: 3.5rem 1.2rem;
            }
            .section-title {
                font-size: 1.5rem !important;
            }
            .cta-group {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .compare-table-wrap {
                font-size: 0.8rem;
            }
        }