:root {
            --gtmamk-primary: #FF4B33;
            --gtmamk-secondary: #FF8235;
            --gtmamk-dark: #1D1D1F;
            --gtmamk-light: #F5F7FA;
            --gtmamk-white: #FFFFFF;
            --gtmamk-accent: #6C5CE7;
            --gtmamk-text-muted: #86868B;
            --gtmamk-max-width: 1400px;
            --gtmamk-nav-height: 80px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--gtmamk-white);
            color: var(--gtmamk-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* 布局通用 */
        .gtmamk-container {
            max-width: var(--gtmamk-max-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .gtmamk-section {
            padding: 96px 0;
            word-break: break-word;
            overflow-wrap: break-word;
        }

        /* 导航栏 */
        .gtmamk-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--gtmamk-nav-height);
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }

        .gtmamk-header-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 100%;
            max-width: var(--gtmamk-max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .gtmamk-logo {
            min-width: 0;
            flex: 0 0 auto;
        }

        .gtmamk-logo img {
            height: 32px;
            display: block;
        }

        .gtmamk-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            align-items: center;
            min-width: 0;
        }

        .gtmamk-nav a {
            text-decoration: none;
            color: var(--gtmamk-dark);
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.3s ease;
            white-space: normal;
        }

        .gtmamk-nav a:hover {
            color: var(--gtmamk-primary);
        }

        /* Hero 区块 - 独特居中排版 */
        .gtmamk-hero {
            padding-top: calc(var(--gtmamk-nav-height) + 64px);
            background: radial-gradient(circle at 80% 20%, rgba(255, 75, 51, 0.05), transparent),
                        radial-gradient(circle at 20% 80%, rgba(108, 92, 231, 0.05), transparent);
            text-align: center;
            min-height: 85vh;
            display: flex;
            align-items: center;
            position: relative;
        }

        .gtmamk-hero-content {
            max-width: 900px;
            margin: 0 auto;
            z-index: 2;
        }

        .gtmamk-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            background: linear-gradient(135deg, var(--gtmamk-dark) 0%, #444 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            word-break: keep-all;
        }

        .gtmamk-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.5rem);
            color: var(--gtmamk-text-muted);
            margin-bottom: 48px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .gtmamk-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            min-width: 0;
        }

        .gtmamk-btn {
            padding: 16px 40px;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            display: inline-block;
        }

        .gtmamk-btn-primary {
            background: linear-gradient(135deg, var(--gtmamk-primary), var(--gtmamk-secondary));
            color: white;
            box-shadow: 0 10px 20px rgba(255, 75, 51, 0.2);
        }

        .gtmamk-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(255, 75, 51, 0.3);
        }

        /* 核心特性 - Bento Grid 风格 */
        .gtmamk-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
            margin-top: 48px;
        }

        .gtmamk-card {
            background: var(--gtmamk-light);
            border-radius: 24px;
            padding: 40px;
            transition: transform 0.3s ease, background 0.3s ease;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-width: 0;
        }

        .gtmamk-card:hover {
            background: #EDEFF2;
            transform: scale(1.02);
        }

        .gtmamk-card-title {
            font-size: 1.75rem;
            margin-bottom: 16px;
            font-weight: 700;
        }

        .gtmamk-card-desc {
            color: var(--gtmamk-text-muted);
            margin-bottom: 24px;
        }

        .gtmamk-tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: auto;
        }

        .gtmamk-tag {
            background: rgba(255, 255, 255, 0.8);
            padding: 6px 14px;
            border-radius: 12px;
            font-size: 0.85rem;
            color: var(--gtmamk-dark);
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        /* 专业词库区块 - 错位布局 */
        .gtmamk-domain-section {
            background: var(--gtmamk-dark);
            color: var(--gtmamk-white);
            border-radius: 40px;
            margin: 48px 24px;
            overflow: hidden;
        }

        .gtmamk-domain-header {
            padding: 80px 80px 40px;
            max-width: 800px;
        }

        .gtmamk-domain-title {
            font-size: clamp(2rem, 3vw, 3rem);
            margin-bottom: 24px;
            line-height: 1.2;
        }

        .gtmamk-lexicon-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 1px;
            background: rgba(255, 255, 255, 0.1);
        }

        .gtmamk-lexicon-item {
            background: var(--gtmamk-dark);
            padding: 60px 40px;
            min-width: 0;
        }

        .gtmamk-lexicon-industry {
            color: var(--gtmamk-secondary);
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 16px;
            display: block;
        }

        .gtmamk-lexicon-depth {
            font-size: 1.25rem;
            margin-bottom: 24px;
            font-weight: 600;
        }

        .gtmamk-lexicon-samples {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .gtmamk-lexicon-sample {
            font-family: monospace;
            background: rgba(255, 255, 255, 0.05);
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 0.9rem;
            color: #ccc;
        }

        /* 资讯区块 */
        .gtmamk-news-section {
            background: #fff;
        }

        .gtmamk-section-label {
            display: block;
            text-align: center;
            color: var(--gtmamk-primary);
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 3px;
        }

        .gtmamk-section-title {
            text-align: center;
            font-size: clamp(1.8rem, 2.5vw, 2.5rem);
            margin-bottom: 64px;
        }

        /* 页脚 */
        .gtmamk-footer {
            background: #F9F9FB;
            padding: 80px 0 40px;
            border-top: 1px solid #eee;
        }

        .gtmamk-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .gtmamk-footer-brand {
            grid-column: span 1;
        }

        .gtmamk-footer-brand-name {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--gtmamk-dark);
            margin-bottom: 16px;
            display: block;
        }

        .gtmamk-footer-links h4 {
            margin-bottom: 24px;
            font-size: 1rem;
        }

        .gtmamk-footer-links ul {
            list-style: none;
        }

        .gtmamk-footer-links li {
            margin-bottom: 12px;
        }

        .gtmamk-footer-links a {
            color: var(--gtmamk-text-muted);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .gtmamk-footer-links a:hover {
            color: var(--gtmamk-primary);
        }

        .gtmamk-footer-bottom {
            border-top: 1px solid #eee;
            padding-top: 32px;
            text-align: center;
            color: var(--gtmamk-text-muted);
            font-size: 0.9rem;
        }

        /* 响应式适配 */
        @media (max-width: 1024px) {
            .gtmamk-domain-header {
                padding: 60px 40px 30px;
            }
        }

        @media (max-width: 768px) {
            .gtmamk-nav {
                display: none; /* 简化移动端，实际应有汉堡菜单 */
            }
            .gtmamk-hero {
                padding-top: 120px;
            }
            .gtmamk-domain-section {
                margin: 24px 12px;
                border-radius: 20px;
            }
            .gtmamk-domain-header {
                padding: 40px 24px 20px;
            }
            .gtmamk-lexicon-item {
                padding: 40px 24px;
            }
            .gtmamk-section {
                padding: 64px 0;
            }
        }