/* ============================================================
   ToDesk官网模板 - 全局样式
   符合谷歌SEO和GEO标准
   ============================================================ */

/* 重置与基础样式 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* ============================================================
   Header 头部导航
   ============================================================ */
header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow 0.3s;
}

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

.logo img {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: 28px;
    align-items: center;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: #444;
    transition: color 0.3s;
    padding: 5px 0;
    border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
    color: #0066FF;
    border-bottom-color: #0066FF;
}

.header-actions .btn-download {
    background-color: #0066FF;
    color: #fff;
    padding: 9px 22px;
    border-radius: 22px;
    font-weight: 600;
    font-size: 15px;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.header-actions .btn-download:hover {
    background-color: #0052cc;
    box-shadow: 0 4px 12px rgba(0,102,255,0.3);
}

/* ============================================================
   Footer 底部
   ============================================================ */
footer {
    background-color: #1a1a1a;
    color: #fff;
    padding: 60px 0 25px;
    margin-top: 0;
}

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

.footer-col h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #fff;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    color: #888;
    font-size: 14px;
    transition: color 0.3s;
    line-height: 1.5;
}

.footer-col ul li a:hover {
    color: #fff;
}

.footer-bottom {
    text-align: center;
    padding-top: 25px;
    border-top: 1px solid #2d2d2d;
    color: #555;
    font-size: 14px;
}

/* ============================================================
   面包屑导航
   ============================================================ */
.breadcrumb {
    padding: 18px 0;
    font-size: 14px;
    color: #888;
}

.breadcrumb a {
    color: #0066FF;
    transition: color 0.3s;
}

.breadcrumb a:hover {
    color: #0052cc;
    text-decoration: underline;
}

.breadcrumb span {
    margin: 0 3px;
}

/* ============================================================
   通用组件
   ============================================================ */
.section-title {
    text-align: center;
    font-size: 34px;
    font-weight: 700;
    margin-bottom: 50px;
    color: #222;
    line-height: 1.3;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 6px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s;
    cursor: pointer;
    font-size: 15px;
}

.btn-primary {
    background-color: #0066FF;
    color: #fff;
    border: 2px solid #0066FF;
}

.btn-primary:hover {
    background-color: #0052cc;
    border-color: #0052cc;
    box-shadow: 0 6px 18px rgba(0,102,255,0.3);
}

.btn-outline {
    background-color: transparent;
    color: #0066FF;
    border: 2px solid #0066FF;
}

.btn-outline:hover {
    background-color: #0066FF;
    color: #fff;
}

/* ============================================================
   响应式设计
   ============================================================ */
@media (max-width: 1024px) {
    .nav-links {
        gap: 18px;
    }
    .nav-links a {
        font-size: 14px;
    }
    .footer-inner {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .footer-inner {
        grid-template-columns: 1fr 1fr;
        gap: 25px;
    }
    .section-title {
        font-size: 26px;
        margin-bottom: 35px;
    }
}

@media (max-width: 480px) {
    .footer-inner {
        grid-template-columns: 1fr;
    }
    .container {
        padding: 0 15px;
    }
}