/* 分屏布局，左侧文案右侧下载卡片 CSS */
:root {
    --dt-blue: #007FFF;
    --dt-blue-hover: #0066CC;
    --dt-blue-light: #E5F2FF;
    --dt-dark: #171A1D;
    --text-main: #222222;
    --text-sub: #555555;
    --text-light: #999999;
    --bg-white: #FFFFFF;
    --bg-gray: #F5F7FA;
    --border-color: #E8ECEF;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 30px rgba(0, 127, 255, 0.1);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

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

body {
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition);
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 18px;
}

.btn-primary {
    background-color: var(--dt-blue);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(0, 127, 255, 0.3);
}

.btn-primary:hover {
    background-color: var(--dt-blue-hover);
    box-shadow: 0 6px 16px rgba(0, 127, 255, 0.4);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: var(--bg-white);
    border-color: var(--dt-blue);
    color: var(--dt-blue);
}

.btn-outline:hover {
    background-color: var(--dt-blue-light);
}

/* 导航栏 */
.split-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background-color: var(--dt-blue);
    border-radius: 10px 10px 10px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    font-size: 20px;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--dt-dark);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-menu a {
    font-size: 15px;
    color: var(--text-sub);
    font-weight: 500;
}

.nav-menu a:hover, .nav-menu a.active {
    color: var(--dt-blue);
}

.nav-actions {
    display: flex;
    gap: 16px;
    align-items: center;
}

/* Hero 首屏 - 分屏布局 */
.split-hero {
    padding: 140px 0 80px;
    background-color: var(--bg-gray);
    background-image: radial-gradient(circle at right top, var(--dt-blue-light) 0%, transparent 50%);
    position: relative;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
}

.hero-left {
    padding-right: 20px;
}

.hero-tag {
    display: inline-block;
    padding: 6px 16px;
    background-color: rgba(0, 127, 255, 0.1);
    color: var(--dt-blue);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-left h1 {
    font-size: 48px;
    line-height: 1.2;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--dt-dark);
    letter-spacing: -1px;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-sub);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-trust {
    display: flex;
    gap: 24px;
    font-size: 15px;
    color: var(--text-sub);
}

.hero-trust span {
    display: flex;
    align-items: center;
    gap: 8px;
}

.hero-trust span i {
    color: var(--dt-blue);
    font-style: normal;
    font-weight: bold;
}

/* 右侧下载卡片 */
.hero-download-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 40px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.card-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    background-color: var(--bg-gray);
}

.hero-download-card h3 {
    font-size: 24px;
    color: var(--dt-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.hero-download-card p {
    color: var(--text-light);
    margin-bottom: 24px;
    font-size: 14px;
}

.card-actions {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* 数据背书区 */
.split-data {
    padding: 60px 0;
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
}

.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.data-num {
    font-size: 40px;
    font-weight: 800;
    color: var(--dt-blue);
    margin-bottom: 8px;
}

.data-label {
    font-size: 15px;
    color: var(--text-sub);
    font-weight: 500;
}

/* 通用区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--dt-dark);
    margin-bottom: 16px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-sub);
}

/* 核心功能区 */
.split-features {
    padding: 100px 0;
    background-color: var(--bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background-color: var(--bg-gray);
    padding: 40px 32px;
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 1px solid transparent;
}

.feature-card:hover {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    border-color: var(--border-color);
    transform: translateY(-4px);
}

.f-icon {
    width: 56px;
    height: 56px;
    background-color: var(--dt-blue-light);
    color: var(--dt-blue);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 16px;
    font-weight: 600;
    color: var(--dt-dark);
}

.feature-card p {
    color: var(--text-sub);
    font-size: 15px;
    line-height: 1.6;
}

/* 行业解决方案区 */
.split-solutions {
    padding: 100px 0;
    background-color: var(--bg-gray);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.solution-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.solution-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.s-img {
    height: 200px;
    overflow: hidden;
}

.s-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.solution-card:hover .s-img img {
    transform: scale(1.05);
}

.s-content {
    padding: 32px;
}

.s-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--dt-dark);
}

.s-content p {
    font-size: 15px;
    color: var(--text-sub);
}

/* 底部 CTA */
.split-cta {
    padding: 100px 0;
    background-color: var(--dt-blue);
    color: #ffffff;
    text-align: center;
}

.split-cta h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 24px;
}

.split-cta p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.btn-white {
    background-color: #ffffff;
    color: var(--dt-blue);
}

.btn-white:hover {
    background-color: var(--bg-gray);
}

/* 下载页专用 */
.download-page {
    padding: 140px 0 80px;
    background-color: var(--bg-gray);
}

.dl-header {
    text-align: center;
    margin-bottom: 60px;
}

.dl-header h1 {
    font-size: 42px;
    color: var(--dt-dark);
    margin-bottom: 16px;
}

.dl-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.dl-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 48px 32px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
}

.dl-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--dt-blue);
    transform: translateY(-4px);
}

.dl-card.primary {
    border: 2px solid var(--dt-blue);
    box-shadow: 0 8px 24px rgba(0, 127, 255, 0.15);
}

.dl-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--dt-blue);
    color: #fff;
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.d-icon {
    font-size: 64px;
    margin-bottom: 24px;
}

.dl-card h3 {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--dt-dark);
}

.dl-card p {
    color: var(--text-sub);
    margin-bottom: 32px;
    font-size: 15px;
    min-height: 48px;
}

/* 帮助中心专用 */
.help-page {
    padding: 140px 0 80px;
    background-color: var(--bg-white);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--bg-gray);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    transition: var(--transition);
}

.faq-item:hover {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-md);
    border-color: var(--dt-blue);
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--dt-dark);
    font-weight: 600;
}

.faq-item p {
    font-size: 15px;
    color: var(--text-sub);
    line-height: 1.7;
}

/* 页脚 */
.split-footer {
    background-color: var(--dt-dark);
    color: #ffffff;
    padding: 80px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-brand .logo-icon {
    background-color: #ffffff;
    color: var(--dt-dark);
}

.footer-brand .logo-text {
    color: #ffffff;
}

.footer-brand p {
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 16px;
    margin-bottom: 24px;
    font-weight: 600;
    color: #ffffff;
}

.footer-links a {
    display: block;
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 16px;
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid #333333;
    padding-top: 24px;
    text-align: center;
    font-size: 14px;
    color: var(--text-light);
}

@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-left {
        padding-right: 0;
    }
    .hero-trust {
        justify-content: center;
    }
    .features-grid, .solutions-grid, .dl-grid, .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .data-grid {
        grid-template-columns: 1fr 1fr;
    }
    .nav-menu { display: none; }
}