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

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f9fafc;
            color: #0b1e33;
            line-height: 1.5;
            scroll-behavior: smooth;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 头部 — 干净、现代 */
        header {
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px);
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
            position: sticky;
            top: 0;
            z-index: 50;
            border-bottom: 1px solid #eef2f6;
        }

        .header-flex {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 14px 0;
        }

        .logo-area h1 {
            font-size: 1.9rem;
            font-weight: 750;
            background: linear-gradient(145deg, #0f2b4b, #2563eb);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
        }

        .logo-area p {
            font-size: 0.75rem;
            color: #54708f;
            margin-top: 4px;
            font-weight: 400;
            letter-spacing: 0.3px;
        }

        .nav-links {
            display: flex;
            gap: 1.8rem;
            align-items: center;
            flex-wrap: wrap;
        }

        .nav-links a {
            text-decoration: none;
            font-weight: 530;
            color: #1e2f44;
            transition: color 0.15s;
            font-size: 0.95rem;
        }

        .nav-links a:hover, .nav-links a.active {
            color: #2563eb;
        }

        /* 主内容 — 决策中心特色 */
        .section-title {
            font-size: 2.4rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 24px;
            color: #0b1e33;
        }

        .section-sub {
            font-size: 1.1rem;
            color: #3a5670;
            margin-bottom: 48px;
            text-align: center;
        }

        .hero-decision {
            text-align: center;
            padding: 48px 0 28px;
        }

        .hero-decision h2 {
            font-size: 3.2rem;
            font-weight: 800;
            background: linear-gradient(135deg, #0f2b4b, #2563eb, #3b82f6);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            margin-bottom: 16px;
            line-height: 1.2;
        }

        .badge-2026 {
            display: inline-block;
            background: #dbeafe;
            color: #1e4bd2;
            padding: 6px 20px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 1rem;
            margin-bottom: 20px;
            border: 1px solid #bdd3ff;
        }

        /* 用户分型卡片 — 第一屏核心创新 */
        .persona-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin: 40px 0 30px;
        }

        .persona-card {
            background: white;
            border-radius: 32px;
            padding: 28px 18px 24px;
            box-shadow: 0 15px 30px -8px rgba(0,35,70,0.06);
            border: 1px solid #e9edf4;
            transition: all 0.2s ease;
            text-align: center;
            cursor: pointer;
            backdrop-filter: blur(4px);
        }

        .persona-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 28px 35px -12px rgba(37,99,235,0.12);
            border-color: #bdd3ff;
        }

        .persona-emoji {
            font-size: 3.2rem;
            margin-bottom: 18px;
        }

        .persona-card h3 {
            font-size: 1.7rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .persona-badge {
            background: #eef4ff;
            padding: 4px 10px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            color: #2563eb;
            display: inline-block;
            margin: 8px 0 12px;
        }

        .persona-desc {
            color: #3e5a77;
            font-size: 0.9rem;
            margin-bottom: 18px;
        }

        .persona-btn {
            background: transparent;
            border: 1.5px solid #2563eb;
            color: #2563eb;
            padding: 8px 22px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: 0.15s;
            text-decoration: none;
            display: inline-block;
        }

        .persona-btn:hover {
            background: #2563eb;
            color: white;
        }

        /* 第二屏 — 智能推荐 */
        .recommend-box {
            background: linear-gradient(105deg, #ffffff 0%, #f5faff 100%);
            border-radius: 48px;
            padding: 40px 40px;
            margin: 50px 0 40px;
            border: 1px solid #d9e6ff;
            box-shadow: 0 25px 40px -20px rgba(0,67,156,0.12);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
        }

        .recommend-left {
            flex: 2;
        }

        .rec-chip {
            background: #1e3b63;
            color: white;
            padding: 6px 20px;
            border-radius: 40px;
            font-size: 0.9rem;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 20px;
            letter-spacing: 0.3px;
        }

        .recommend-left h3 {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .rec-highlight {
            color: #2563eb;
        }

        .reason-list {
            list-style: none;
            margin: 24px 0;
        }

        .reason-list li {
            margin-bottom: 12px;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .check-icon {
            color: #10b981;
            font-weight: bold;
            font-size: 1.4rem;
        }

        .recommend-right {
            flex: 1;
            text-align: center;
        }

        .download-big-btn {
            background: #1e3b63;
            color: white;
            padding: 18px 38px;
            border-radius: 60px;
            font-weight: 700;
            font-size: 1.3rem;
            text-decoration: none;
            display: inline-block;
            box-shadow: 0 16px 28px -8px rgba(30,59,99,0.3);
            transition: 0.15s;
            border: none;
            cursor: pointer;
            margin-bottom: 12px;
        }

        .download-big-btn:hover {
            background: #0f2b4b;
            transform: scale(1.02);
        }

        .small-note {
            color: #52739c;
            font-size: 0.9rem;
        }

        /* 第三屏 — 生态地图 (节点图创意) */
        .eco-map {
            margin: 70px 0 40px;
        }

        .map-title {
            font-size: 2rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 40px;
        }

        .map-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 30px 50px;
            background: #ffffffd6;
            border-radius: 60px;
            padding: 40px 20px;
            backdrop-filter: blur(4px);
            border: 1px solid #eef2f8;
        }

        .map-node {
            text-align: center;
            min-width: 160px;
        }

        .node-main {
            background: #1e3b63;
            color: white;
            padding: 18px 16px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 1.4rem;
            box-shadow: 0 15px 20px -6px rgba(0,0,0,0.1);
        }

        .node-sub {
            margin-top: 15px;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .sub-item {
            background: #eef4ff;
            padding: 10px 12px;
            border-radius: 40px;
            font-weight: 500;
            color: #1e3b63;
            border: 1px solid #cfdff5;
        }

        .legacy-node {
            opacity: 0.8;
        }

        .legacy-node .node-main {
            background: #64748b;
        }

        .arrow-symbol {
            font-size: 2.5rem;
            color: #3b82f6;
            align-self: center;
        }

        /* 号召区域 + 快速链接 */
        .cta-download-section {
            background: #0f2b4b;
            border-radius: 60px;
            padding: 48px 40px;
            margin: 60px 0;
            color: white;
            text-align: center;
        }

        .cta-download-section h3 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .cta-download-section .btn-light {
            background: white;
            color: #0f2b4b;
            padding: 16px 48px;
            border-radius: 60px;
            font-weight: 700;
            font-size: 1.3rem;
            text-decoration: none;
            display: inline-block;
            margin-top: 20px;
            transition: 0.2s;
        }

        .cta-download-section .btn-light:hover {
            background: #e0edff;
            transform: scale(1.02);
        }

        footer {
            background: #0b1a2a;
            color: #b0c7de;
            padding: 40px 0 24px;
            margin-top: 20px;
            border-top: 1px solid #1e3347;
        }

        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 32px;
        }

        .footer-copyright {
            text-align: center;
            padding-top: 32px;
            font-size: 0.85rem;
            border-top: 1px solid #1e3347;
            margin-top: 24px;
        }

        /* 响应式 */
        @media (max-width: 900px) {
            .persona-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .recommend-box {
                flex-direction: column;
                text-align: center;
            }
            .recommend-left h3 {
                font-size: 2rem;
            }
            .map-container {
                flex-direction: column;
                align-items: center;
            }
            .arrow-symbol {
                transform: rotate(90deg);
            }
        }

        @media (max-width: 600px) {
            .persona-grid {
                grid-template-columns: 1fr;
            }
            .header-flex {
                flex-direction: column;
                gap: 12px;
            }
            .nav-links {
                gap: 1rem;
                justify-content: center;
            }
        }

        /* 简单动画 */
        .persona-card, .download-big-btn {
            transition: all 0.2s cubic-bezier(0.23, 1, 0.32, 1);
        }