/* 钉钉下载官网，企业办公工具页，突出官方来源 CSS */
:root {
    --official-blue: #007FFF;
    --official-blue-hover: #0066CC;
    --official-dark: #171A1D;
    --text-primary: #111F2C;
    --text-regular: #555E67;
    --text-muted: #8F99A3;
    --bg-main: #F4F6F9;
    --bg-white: #FFFFFF;
    --border-line: #E3E5E8;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-base: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 12px 24px rgba(0, 0, 0, 0.08);
    --shadow-primary: 0 6px 16px rgba(0, 127, 255, 0.25);
    --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-primary);
    line-height: 1.6;
    background-color: var(--bg-main);
    -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;
}

/* 官方认证徽章 */
.official-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: #E6F2FF;
    color: var(--official-blue);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
    border: 1px solid rgba(0, 127, 255, 0.2);
}

.official-badge::before {
    content: '✓';
    display: inline-block;
    background: var(--official-blue);
    color: #fff;
    border-radius: 50%;
    width: 16px;
    height: 16px;
    text-align: center;
    line-height: 16px;
    font-size: 10px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition);
}

.btn-lg {
    padding: 14px 36px;
    font-size: 16px;
}

.btn-primary {
    background-color: var(--official-blue);
    color: #ffffff;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    background-color: var(--official-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 127, 255, 0.35);
}

.btn-outline {
    background-color: var(--bg-white);
    border-color: var(--border-line);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--official-blue);
    color: var(--official-blue);
}

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

/* 导航栏 - 官方严谨 */
.tool-nav {
    position: sticky;
    top: 0;
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-line);
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}

.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: 32px;
    height: 32px;
    background-color: var(--official-blue);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    font-size: 16px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

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

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

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

/* Hero 首屏 - 突出官方来源 */
.tool-hero {
    background-color: var(--bg-white);
    padding: 80px 0;
    border-bottom: 1px solid var(--border-line);
}

.page-hero {
    padding: 60px 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 44px;
    line-height: 1.3;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--text-primary);
}

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

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.hero-meta {
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    gap: 20px;
}

.hero-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.hero-visual .hero-img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-hover);
    border: 1px solid var(--border-line);
}

/* 数据背书区 */
.tool-data {
    padding: 40px 0;
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-line);
}

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

.data-num {
    font-size: 36px;
    font-weight: 800;
    color: var(--official-blue);
    margin-bottom: 8px;
}

.data-label {
    font-size: 14px;
    color: var(--text-regular);
    font-weight: 500;
}

/* 通用区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.section-header p {
    font-size: 16px;
    color: var(--text-regular);
}

/* 核心功能区 */
.tool-features {
    padding: 80px 0;
    background-color: var(--bg-main);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

.feature-card:hover {
    box-shadow: var(--shadow-base);
    border-color: var(--official-blue);
    transform: translateY(-2px);
}

.f-icon {
    width: 48px;
    height: 48px;
    background-color: #F0F7FF;
    color: var(--official-blue);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    font-weight: 700;
}

.feature-card p {
    color: var(--text-regular);
    font-size: 14px;
    line-height: 1.6;
}

/* 行业解决方案区 */
.tool-solutions {
    padding: 80px 0;
    background-color: var(--bg-white);
}

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

.solution-card {
    background-color: var(--bg-main);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-line);
    transition: var(--transition);
}

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

.s-img {
    height: 180px;
    overflow: hidden;
}

.s-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.s-content {
    padding: 24px;
}

.s-content h3 {
    font-size: 18px;
    margin-bottom: 12px;
    font-weight: 700;
}

.s-content p {
    font-size: 14px;
    color: var(--text-regular);
}

/* 底部 CTA */
.tool-cta {
    padding: 80px 0;
    background-color: var(--official-dark);
    color: #ffffff;
    text-align: center;
}

.tool-cta h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 16px;
}

.tool-cta p {
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 32px;
}

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

.btn-white {
    background-color: #ffffff;
    color: var(--text-primary);
}

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

/* 下载页专用 */
.download-section {
    padding: 60px 0 100px;
    background-color: var(--bg-main);
}

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

.dl-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-line);
    border-radius: var(--radius-md);
    padding: 40px 32px;
    text-align: center;
    transition: var(--transition);
}

.dl-card:hover {
    box-shadow: var(--shadow-hover);
    border-color: var(--official-blue);
}

.dl-card.highlight {
    border: 2px solid var(--official-blue);
    position: relative;
    background-color: #FAFCFF;
}

.dl-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--official-blue);
    color: #fff;
    font-size: 12px;
    padding: 4px 16px;
    border-radius: 12px;
    font-weight: 600;
}

.d-icon {
    font-size: 56px;
    margin-bottom: 20px;
}

.dl-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 700;
}

.dl-card p {
    color: var(--text-regular);
    font-size: 14px;
    margin-bottom: 24px;
    min-height: 42px;
}

/* 帮助中心专用 */
.faq-section {
    padding: 60px 0 100px;
    background-color: var(--bg-white);
}

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

.faq-item {
    background-color: var(--bg-main);
    border: 1px solid var(--border-line);
    padding: 24px 32px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
}

.faq-item h3 {
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-weight: 700;
}

.faq-item p {
    font-size: 14px;
    color: var(--text-regular);
    line-height: 1.6;
}

/* 页脚 */
.tool-footer {
    background-color: var(--official-dark);
    color: var(--text-muted);
    padding: 64px 0 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

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

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

.footer-brand p {
    margin-top: 16px;
    font-size: 14px;
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 15px;
    margin-bottom: 20px;
    font-weight: 600;
    color: #ffffff;
}

.footer-links a {
    display: block;
    font-size: 14px;
    margin-bottom: 12px;
}

.footer-links a:hover {
    color: var(--official-blue);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
}

@media (max-width: 900px) {
    .hero-grid, .data-grid, .features-grid, .solutions-grid, .download-grid, .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .nav-menu { display: none; }
    .hero-actions, .cta-actions { flex-direction: column; }
}