:root {
            --violet-50: #f5f2ff;
            --violet-100: #ede7ff;
            --violet-400: #a78bfa;
            --violet-500: #7c3aed;
            --violet-600: #6d28d9;
            --violet-700: #4f46e5;
            --indigo-600: #4f46e5;
            --indigo-700: #4338ca;
            --slate-900: #1a142b;
            --slate-700: #3a3450;
            --slate-500: #6b6480;
            --slate-400: #7a748a;
            --slate-300: #b0aac0;
            --white-soft: #faf8ff;
            --white-pure: #ffffff;
            --radius-xl: 32px;
            --radius-lg: 24px;
            --radius-full: 60px;
            --shadow-card: 0 4px 20px rgba(79, 70, 229, 0.06);
            --shadow-hover: 0 14px 36px rgba(124, 58, 237, 0.12);
            --shadow-btn: 0 8px 26px rgba(79, 70, 229, 0.28);
            --blur-bg: rgba(255, 255, 255, 0.55);
            --border-subtle: rgba(124, 58, 237, 0.07);
            --border-medium: rgba(124, 58, 237, 0.16);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', Roboto, sans-serif;
            background: var(--violet-50);
            color: var(--slate-900);
            line-height: 1.55;
            -webkit-font-smoothing: antialiased;
        }
        a { text-decoration: none; color: inherit; transition: color 0.22s ease; }
        ul { list-style: none; padding: 0; margin: 0; }
        .container { max-width: 1220px; margin: 0 auto; padding: 0 28px; }

        /* Header (保持不变) */
        .header {
            background: var(--blur-bg);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.45);
            padding: 13px 0;
            position: sticky;
            top: 0;
            z-index: 60;
        }
        .header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 14px; }
        .logo { display: flex; align-items: center; gap: 10px; font-weight: 750; font-size: 23px; letter-spacing: -0.4px; }
        .logo svg { display: block; }
        .logo .brand {
            background: linear-gradient(135deg, #7c3aed 0%, #4f46e5 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo .year-tag {
            font-size: 12px; font-weight: 550; color: #7c7a8a;
            background: rgba(124, 58, 237, 0.1); padding: 3px 13px;
            border-radius: 40px; -webkit-text-fill-color: #6b6480; letter-spacing: 0.2px;
        }
        .nav { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
        .nav>li { position: relative; list-style: none; }
        .nav>li>a, .nav>li>.nav-label {
            display: inline-flex; align-items: center; gap: 5px; font-size: 14.5px;
            font-weight: 530; color: var(--slate-700); padding: 8px 14px;
            border-radius: 40px; cursor: pointer; transition: 0.22s; letter-spacing: 0.1px;
            white-space: nowrap; background: transparent; border: none; font-family: inherit;
        }
        .nav>li>a:hover, .nav>li>.nav-label:hover { color: var(--indigo-600); background: rgba(124, 58, 237, 0.06); }
        .nav>li>a.active {
            color: var(--indigo-600); font-weight: 650;
            background: rgba(124, 58, 237, 0.08); box-shadow: 0 0 0 1px rgba(124, 58, 237, 0.12);
        }
        .nav .pill-link {
            background: var(--indigo-600); color: #fff !important; font-size: 12.5px;
            padding: 9px 18px; border-radius: 40px; font-weight: 620;
            box-shadow: 0 4px 14px rgba(79, 70, 229, 0.24); letter-spacing: 0.2px; margin-left: 8px;
        }
        .nav .pill-link:hover { background: #7c3aed; box-shadow: 0 7px 22px rgba(124, 58, 237, 0.34); }
        .nav .arrow-icon { width: 14px; height: 14px; transition: transform 0.25s; opacity: 0.5; }
        .nav>li:hover>.nav-label .arrow-icon { transform: rotate(180deg); opacity: 1; }
        .nav .dropdown {
            position: absolute; top: calc(100% + 8px); left: 0; min-width: 210px;
            background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(20px);
            border-radius: 20px; padding: 8px; box-shadow: 0 20px 48px rgba(79, 70, 229, 0.14);
            border: 1px solid rgba(124, 58, 237, 0.1); opacity: 0; visibility: hidden;
            transform: translateY(8px); transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            z-index: 70; display: flex; flex-direction: column;
        }
        .nav>li:hover>.dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
        .nav .dropdown li a {
            display: flex; align-items: center; gap: 8px; padding: 10px 14px;
            border-radius: 14px; font-size: 13.5px; font-weight: 500; color: var(--slate-700);
            transition: 0.2s; white-space: nowrap;
        }
        .nav .dropdown li a:hover { background: rgba(124, 58, 237, 0.07); color: var(--indigo-600); font-weight: 600; }
        .mobile-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 5px; }
        .mobile-toggle span { display: block; width: 27px; height: 2.6px; background: var(--slate-900); border-radius: 4px; }

        /* Hero */
        .page-hero {
            padding: 56px 0 38px;
            background: linear-gradient(150deg, #ede7ff 0%, #f5f2ff 60%, #faf8ff 100%);
            border-bottom: 1px solid rgba(124, 58, 237, 0.07);
            text-align: center;
        }
        .page-hero h1 { font-size: 44px; font-weight: 820; letter-spacing: -0.03em; margin-bottom: 10px; }
        .page-hero h1 .accent {
            background: linear-gradient(135deg, #7c3aed 0%, #4f46e5 100%);
            -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
        }
        .page-hero .sub { font-size: 18px; color: #4a4460; max-width: 680px; margin: 0 auto 24px; }
        .hero-stats {
            display: flex; justify-content: center; flex-wrap: wrap; gap: 28px;
            border-top: 1px solid rgba(124,58,237,0.1); padding-top: 20px; margin-top: 8px;
        }
        .hero-stat { text-align: center; }
        .hero-stat .num { font-size: 28px; font-weight: 800; background: linear-gradient(135deg, #7c3aed, #4f46e5); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; display: block; }
        .hero-stat .label { font-size: 14px; color: #6b6480; }

        /* 核心加密层 */
        .encryption-layers {
            padding: 60px 0 56px;
            background: var(--white-pure);
        }
        .section-title { text-align: center; margin-bottom: 44px; }
        .section-title h2 { font-size: 34px; font-weight: 800; }
        .section-title h2 .accent { background: linear-gradient(135deg, #7c3aed, #4f46e5); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .section-title p { font-size: 17px; color: #5a5470; max-width: 600px; margin: 8px auto 0; }
        .layer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
        .layer-card {
            background: var(--white-soft); border-radius: var(--radius-lg); padding: 26px 20px;
            text-align: center; border: 1px solid var(--border-subtle); transition: 0.3s;
        }
        .layer-card:hover { border-color: #7c3aed; box-shadow: var(--shadow-hover); transform: translateY(-5px); }
        .layer-icon { font-size: 38px; margin-bottom: 12px; }
        .layer-card h4 { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
        .layer-card p { font-size: 14px; color: #5a5470; }

        /* 前向安全性 + 抗量子 */
        .forward-secrecy {
            padding: 56px 0 60px;
            background: var(--violet-50);
            border-top: 1px solid rgba(124,58,237,0.05);
        }
        .split-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 24px; }
        .info-card {
            background: var(--white-pure); border-radius: var(--radius-lg); padding: 30px 28px;
            border: 1px solid rgba(124,58,237,0.05); transition: 0.25s;
        }
        .info-card:hover { border-color: rgba(124,58,237,0.15); box-shadow: var(--shadow-hover); }
        .info-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
        .info-card p { font-size: 15px; color: #4a4460; line-height: 1.6; }

        /* 安全审计时间线 */
        .audit-timeline {
            padding: 56px 0 58px;
            background: var(--white-pure);
            border-top: 1px solid rgba(124,58,237,0.04);
        }
        .timeline { position: relative; padding-left: 40px; margin-top: 20px; }
        .timeline::before { content: ''; position: absolute; left: 16px; top: 0; bottom: 0; width: 2px; background: rgba(124,58,237,0.15); }
        .timeline-item { margin-bottom: 30px; position: relative; }
        .timeline-item::before { content: ''; position: absolute; left: -30px; top: 6px; width: 12px; height: 12px; background: #7c3aed; border-radius: 50%; border: 3px solid white; box-shadow: 0 0 0 2px #7c3aed; }
        .timeline-item h4 { font-size: 18px; font-weight: 700; margin-bottom: 2px; }
        .timeline-item p { font-size: 14px; color: #5a5470; }

        /* 防御矩阵 */
        .defense-matrix {
            padding: 54px 0 56px;
            background: var(--violet-50);
            border-top: 1px solid rgba(124,58,237,0.05);
        }
        .matrix-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 20px; }
        .matrix-card {
            background: var(--white-pure); border-radius: var(--radius-lg); padding: 28px 22px;
            text-align: center; border: 1px solid rgba(124,58,237,0.04);
        }
        .matrix-card:hover { box-shadow: var(--shadow-hover); border-color: rgba(124,58,237,0.15); }
        .matrix-card .icon { font-size: 36px; margin-bottom: 8px; }
        .matrix-card h4 { font-size: 17px; font-weight: 700; margin-bottom: 2px; }

        /* Footer */
        .footer {
            background: #1a142b; color: #b0aac0; padding: 44px 0 26px;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
        }
        .footer-inner { display: grid; grid-template-columns: repeat(auto-fit, minmax(155px, 1fr)); gap: 30px; }
        .footer-col h5 { color: #e8e3f0; font-size: 15.5px; font-weight: 620; margin-bottom: 11px; }
        .footer-col p, .footer-col li { font-size: 13.5px; line-height: 1.85; color: #b0aac0; }
        .footer-col ul li { margin-bottom: 1px; }
        .footer-col a { color: #b0aac0; transition: 0.2s; }
        .footer-col a:hover { color: #d0c8e8; }
        .footer-bottom {
            margin-top: 26px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,0.04);
            display: flex; flex-wrap: wrap; justify-content: space-between; font-size: 12.5px; color: #7a748a; gap: 10px;
        }
        .footer-bottom .meta-group { display: flex; flex-wrap: wrap; gap: 16px; }

        @media (max-width: 960px) {
            .layer-grid { grid-template-columns: 1fr 1fr; }
            .split-grid { grid-template-columns: 1fr; }
            .matrix-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 720px) {
            .nav { display: none; width: 100%; flex-direction: column; gap: 2px; padding: 12px 0; border-top: 1px solid rgba(124,58,237,0.1); }
            .nav.open { display: flex; }
            .mobile-toggle { display: flex; }
            .header-inner { flex-wrap: wrap; }
            .page-hero h1 { font-size: 32px; }
            .layer-grid { grid-template-columns: 1fr; }
            .matrix-grid { grid-template-columns: 1fr; }
            .footer-inner { grid-template-columns: 1fr 1fr; }
            .footer-bottom { flex-direction: column; }
        }
        @media (max-width: 480px) {
            .container { padding: 0 15px; }
            .page-hero h1 { font-size: 26px; }
            .footer-inner { grid-template-columns: 1fr; }
        }