/* 钉钉电脑版下载页，企业软件下载安装页，信息明确 CSS */
:root {
    --ent-blue: #005FB8; /* 企业经典蓝 */
    --ent-blue-hover: #004A94;
    --ent-blue-light: #EBF3FC;
    --ent-dark: #1A1A1A;
    --text-main: #333333;
    --text-sub: #555555;
    --text-light: #888888;
    --bg-white: #FFFFFF;
    --bg-gray: #F5F7FA;
    --border-color: #E0E0E0;
    --success-color: #107C10;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 12px;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.2s ease-in-out;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
}

body {
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--bg-gray);
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

.btn-lg {
    padding: 14px 36px;
    font-size: 18px;
}

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

.btn-primary:hover {
    background-color: var(--ent-blue-hover);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--ent-blue);
    color: var(--ent-blue);
}

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

.btn-icon {
    margin-right: 8px;
    font-size: 20px;
}

/* 顶部导航 - 信息层级清晰 */
.ent-nav {
    position: sticky;
    top: 0;
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background-color: var(--ent-blue);
    border-radius: 8px;
    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(--ent-dark);
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

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

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

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

/* Hero 首屏 - 软件下载页风格 */
.ent-hero {
    background-color: var(--bg-white);
    padding: 80px 0;
    border-bottom: 1px solid var(--border-color);
}

.hero-wrapper {
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.version-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: var(--ent-blue-light);
    color: var(--ent-blue);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.version-tag::before {
    content: '';
    display: block;
    width: 8px;
    height: 8px;
    background-color: var(--success-color);
    border-radius: 50%;
}

.ent-hero h1 {
    font-size: 44px;
    line-height: 1.2;
    font-weight: 700;
    color: var(--ent-dark);
    margin-bottom: 24px;
}

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

.hero-download-box {
    background-color: var(--bg-gray);
    padding: 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.dl-info-text {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 12px;
    display: flex;
    gap: 16px;
}

.hero-visual {
    flex: 1;
    position: relative;
}

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

/* 数据背书区 - 严谨专业 */
.ent-data {
    padding: 40px 0;
    background-color: var(--ent-blue);
    color: #fff;
}

.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: center;
}

.data-num {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
}

.data-label {
    font-size: 15px;
    opacity: 0.9;
}

/* 通用区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--ent-dark);
    margin-bottom: 16px;
}

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

/* 核心功能区 - 明确的图文卡片 */
.ent-features {
    padding: 90px 0;
    background-color: var(--bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background-color: var(--bg-white);
    padding: 30px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--ent-blue);
}

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

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--ent-dark);
}

.feature-card p {
    color: var(--text-sub);
    font-size: 14px;
    line-height: 1.7;
}

/* 行业解决方案区 */
.ent-solutions {
    padding: 90px 0;
    background-color: var(--bg-gray);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

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

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

.s-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.s-content {
    padding: 24px;
}

.s-content h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--ent-dark);
}

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

/* 下载页专用 - 软件下载列表风 */
.dl-page {
    padding: 60px 0 100px;
    background-color: var(--bg-white);
}

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

.dl-header h1 {
    font-size: 36px;
    color: var(--ent-dark);
    margin-bottom: 16px;
}

.dl-list {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.dl-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 30px;
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.dl-item.primary {
    border: 2px solid var(--ent-blue);
    background-color: var(--ent-blue-light);
}

.dl-item-info {
    display: flex;
    align-items: center;
    gap: 24px;
}

.dl-icon {
    font-size: 48px;
}

.dl-details h3 {
    font-size: 22px;
    color: var(--ent-dark);
    margin-bottom: 8px;
}

.dl-specs {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: var(--text-sub);
}

.dl-specs span {
    background-color: var(--bg-gray);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.dl-item.primary .dl-specs span {
    background-color: #fff;
}

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

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

.help-box {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 40px;
    margin-bottom: 30px;
}

.help-box h3 {
    font-size: 20px;
    color: var(--ent-dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.help-box p {
    font-size: 15px;
    color: var(--text-sub);
    line-height: 1.8;
    margin-bottom: 16px;
}

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

.ent-cta h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.ent-cta p {
    font-size: 18px;
    color: #ccc;
    margin-bottom: 40px;
}

/* 页脚 */
.ent-footer {
    background-color: #111111;
    color: #999;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

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

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

.footer-links h4 {
    font-size: 16px;
    margin-bottom: 20px;
    color: #fff;
}

.footer-links a {
    display: block;
    font-size: 14px;
    color: #999;
    margin-bottom: 12px;
}

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

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 30px;
    text-align: center;
    font-size: 13px;
}

@media (max-width: 992px) {
    .hero-wrapper { flex-direction: column; text-align: center; }
    .features-grid, .solutions-grid, .footer-grid { grid-template-columns: 1fr; }
    .data-grid { grid-template-columns: 1fr 1fr; }
    .dl-item { flex-direction: column; text-align: center; gap: 20px; }
    .dl-item-info { flex-direction: column; }
    .nav-menu { display: none; }
}