/* ============================================================
   common.css — 迈驰智能技术（江苏）有限公司 核心通用样式
   版本: 2.0
   说明: 仅包含全局基础样式、导航栏、底部、容器宽度和文字大小。
         页面中间的模块样式由各页面独立管理。
   ============================================================ */

/* ===== 1. CSS Variables (设计令牌) ===== */
:root {
    --primary: #0052D9;
    --primary-light: #E8F0FE;
    --primary-dark: #003399;
    --bg-white: #FFFFFF;
    --bg-light: #F4F8FC;
    --bg-dark: #0B1A2F;
    --text-dark: #1A1A2E;
    --text-gray: #4A4A6A;
    --text-light: #6B7A99;
    --border-color: #DCE5F2;
    --shadow: 0 10px 40px rgba(0, 82, 217, 0.08);
    --radius: 12px;
    --transition: 0.3s ease;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --container-width: 95%;
}

/* ===== 2. Reset & Base (全局基础样式) ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: var(--font);
    background: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    font-size: 16px;
}
a {
    text-decoration: none;
    color: inherit;
}
img {
    display: block;
    max-width: 100%;
    height: auto;
}
ul {
    list-style: none;
}
/* ===== 标题 ===== */
.section-padding { padding: 80px 0; }
        .section-tag {
            display: inline-block;
            font-size: 18px;
            font-weight: 700;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--primary);
            background: rgba(0, 82, 217, 0.08);
            padding: 6px 20px;
            border-radius: 50px;
            margin-bottom: 12px;
            border: 1px solid rgba(0, 82, 217, 0.1);
        }
        .section-tag-white {
            color: rgba(255,255,255,0.8);
            background: rgba(255,255,255,0.12);
            border-color: rgba(255,255,255,0.15);
        }
        .section-title {
            font-size: clamp(28px, 3.5vw, 42px);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 12px;
            color: var(--text-dark);
        }
        .section-title .highlight { color: var(--primary); }
        .section-title-white { color: #fff; }
        .section-title-white .highlight { color: #FFD700; }
        .section-subtitle {
            font-size: 17px;
            color: var(--text-gray);
            max-width: 640px;
            line-height: 1.7;
        }
        .section-subtitle-white { color: rgba(255,255,255,0.7); }
        .section-header { margin-bottom: 48px; }
		        .text-center { text-align: center; }
        .text-center .section-subtitle { margin-left: auto; margin-right: auto; }

/* ===== 3. Container (宽度控制) ===== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 4. 通用背景类 ===== */
.bg-white {
    background: var(--bg-white);
}
.bg-light {
    background: var(--bg-light);
}
.bg-dark {
    background: var(--bg-dark);
}

/* ===== 5. 按钮 (全局通用) ===== */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 15px;
    transition: all var(--transition);
    border: none;
    cursor: pointer;
    text-align: center;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 82, 217, 0.25);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 82, 217, 0.35);
}
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}
.btn-white {
    background: #fff;
    color: var(--bg-dark);
}
.btn-white:hover {
    background: rgba(255, 255, 255, 0.85);
    transform: translateY(-2px);
}

/* ============================================================
   6. 导航栏（全站统一）
   ============================================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: transparent;
    transition: all var(--transition);
}
.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 2px 30px rgba(0, 0, 0, 0.06);
}
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.navbar .logo a {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 22px;
}
.navbar .logo img {
    height: 65px;
    width: auto;
    transition: filter var(--transition);
    filter: brightness(0) invert(1);
}
.navbar.scrolled .logo img {
    filter: none;
}

/* 主导航菜单 */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-menu > li {
    position: relative;
    padding: 8px 0;
}
.nav-menu > li > a {
    display: block;
    padding: 8px 18px;
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    border-radius: 8px;
    transition: all var(--transition);
    letter-spacing: 0.3px;
}
.navbar.scrolled .nav-menu > li > a {
    color: var(--text-gray);
}
.nav-menu > li > a:hover,
.nav-menu > li > a.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
}
.navbar.scrolled .nav-menu > li > a:hover,
.navbar.scrolled .nav-menu > li > a.active {
    color: var(--primary);
    background: rgba(0, 82, 217, 0.06);
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 260px;
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition);
    border: 1px solid var(--border-color);
}
.nav-menu > li:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.dropdown-menu li a {
    display: block;
    padding: 10px 24px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-gray);
    transition: all var(--transition);
}
.dropdown-menu li a:hover {
    background: var(--bg-light);
    color: var(--primary);
}
/* 场景应用下拉—2列网格 */
.dropdown-menu.scene-grid {
    min-width: 520px;
    padding: 12px 16px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px 16px;
}
.dropdown-menu.scene-grid li a {
    padding: 8px 12px;
    font-size: 14px;
    border-radius: 6px;
}
.dropdown-menu.scene-grid li a:hover {
    background: var(--bg-light);
    color: var(--primary);
}

/* 汉堡菜单（移动端） */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    background: none;
    border: none;
}
.hamburger span {
    display: block;
    width: 28px;
    height: 2.5px;
    background: #fff;
    border-radius: 4px;
    transition: all var(--transition);
}
.navbar.scrolled .hamburger span {
    background: var(--text-dark);
}
.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* 导航菜单激活状态（内页高亮） */
.nav-menu > li > a[href*="about"].active,
.nav-menu > li > a[href*="products"].active,
.nav-menu > li > a[href*="solutions"].active,
.nav-menu > li > a[href*="scenes"].active,
.nav-menu > li > a[href*="cases"].active,
.nav-menu > li > a[href*="news"].active,
.nav-menu > li > a[href*="contact"].active {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
}
.navbar.scrolled .nav-menu > li > a[href*="about"].active,
.navbar.scrolled .nav-menu > li > a[href*="products"].active,
.navbar.scrolled .nav-menu > li > a[href*="solutions"].active,
.navbar.scrolled .nav-menu > li > a[href*="scenes"].active,
.navbar.scrolled .nav-menu > li > a[href*="cases"].active,
.navbar.scrolled .nav-menu > li > a[href*="news"].active,
.navbar.scrolled .nav-menu > li > a[href*="contact"].active {
    color: var(--primary);
    background: rgba(0, 82, 217, 0.06);
}

/* ============================================================
   7. 底部版权（全站统一）
   ============================================================ */
.footer {
    background: #0B1A2F;
    border-top: none;
    padding: 60px 0 30px;
    margin-top: 20px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-col h5 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
    color: #fff;
}
.footer-col p,
.footer-col li {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    line-height: 2;
}
.footer-col ul li a:hover {
    color: #fff;
}
.footer-col .brand {
    font-size: 20px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
    display: block;
}
.footer-col .brand span {
    color: var(--primary);
}
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}
.footer-bottom .copyright {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}
.footer-bottom .footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}
.footer-bottom .footer-links a {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
    transition: color var(--transition);
}
.footer-bottom .footer-links a:hover {
    color: #fff;
}

/* ============================================================
   8. 页面横幅（内页统一）
   ============================================================ */
.page-banner {
    position: relative;
    width: 100%;
    height: 420px;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-dark);
    margin-top: 0;
}
.page-banner .overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.2) 100%);
    z-index: 1;
}
.page-banner .content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: #fff;
    padding: 0 24px;
}
.page-banner .content h1 {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 800;
    margin-bottom: 8px;
}
.page-banner .content h1 .highlight {
    color: #FFD700;
}
.page-banner .content p {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto;
}
.page-banner .breadcrumb {
    margin-top: 12px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}
.page-banner .breadcrumb a {
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition);
}
.page-banner .breadcrumb a:hover {
    color: #FFD700;
}
.page-banner .breadcrumb span {
    margin: 0 8px;
}

/* ============================================================
   9. 响应式断点
   ============================================================ */

/* 1024px 以下 */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
    .page-banner {
        height: 320px;
    }
    .dropdown-menu.scene-grid {
        min-width: 300px;
        grid-template-columns: 1fr 1fr;
    }
}

/* 768px 以下 (平板 & 手机) */
@media (max-width: 768px) {
    /* 导航 - 汉堡菜单 */
    .hamburger {
        display: flex;
    }
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background: var(--bg-white);
        flex-direction: column;
        padding: 80px 28px 40px;
        gap: 8px;
        transition: right var(--transition);
        box-shadow: -10px 0 40px rgba(0, 0, 0, 0.05);
        border-left: 1px solid var(--border-color);
        overflow-y: auto;
        align-items: stretch;
    }
    .nav-menu.open {
        right: 0;
    }
    .nav-menu > li > a {
        font-size: 18px;
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
        border-radius: 0;
        color: var(--text-gray) !important;
    }
    .dropdown-menu {
        position: static;
        box-shadow: none;
        padding-left: 16px;
        opacity: 1;
        visibility: visible;
        transform: none;
        border: none;
        display: none;
    }
    .nav-menu > li:hover .dropdown-menu {
        display: block;
    }
    .dropdown-menu li a {
        padding: 10px 0;
        font-size: 16px;
    }
    .dropdown-menu.scene-grid {
        min-width: auto;
        grid-template-columns: 1fr 1fr;
        padding: 4px 0;
        gap: 0;
    }
    .dropdown-menu.scene-grid li a {
        padding: 8px 12px;
    }
    .navbar.scrolled .nav-menu > li > a {
        color: var(--text-gray) !important;
    }
    .navbar.scrolled .nav-menu > li > a.active {
        color: var(--primary) !important;
        background: rgba(0, 82, 217, 0.06);
    }

    /* 横幅 */
    .page-banner {
        height: 260px;
        margin-top: 64px;
    }
    .page-banner .content h1 {
        font-size: 28px;
    }

    /* 底部 */
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* 480px 以下 (手机) */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .page-banner {
        height: 200px;
    }
    .page-banner .content h1 {
        font-size: 22px;
    }
    .page-banner .content p {
        font-size: 14px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .footer-col .brand {
        font-size: 18px;
    }
}

/* ============================================================
   10. 工具类
   ============================================================ */
.text-center {
    text-align: center;
}
.text-right {
    text-align: right;
}
.text-left {
    text-align: left;
}
.flex {
    display: flex;
}
.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}
.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.gap-8 {
    gap: 8px;
}
.gap-16 {
    gap: 16px;
}
.gap-24 {
    gap: 24px;
}
.gap-32 {
    gap: 32px;
}
.mt-12 {
    margin-top: 12px;
}
.mt-24 {
    margin-top: 24px;
}
.mb-12 {
    margin-bottom: 12px;
}
.mb-24 {
    margin-bottom: 24px;
}
.section-padding {
    padding: 80px 0;
}
@media (max-width: 768px) {
    .section-padding {
        padding: 50px 0;
    }
}
/*分页*/
.pager {text-align: center; margin: 20px 0;}
.pager ul {display: flex; flex-wrap: wrap; justify-content: center}
.pager ul li {display: inline-block;}
.pager ul li a {padding: 10px 15px; margin: 2px 5px; border: #dddddd solid 1px; display: inline-block; font-size:16px;}
.pager ul li a:hover {border: #004781 solid 1px; color: #004781}
.pager ul .active a {border: #004781 solid 1px; display: inline-block; background-color: #004781; color: #fff;}
.pager ul a:not([href]):not([class]):hover {border: #dddddd solid 1px;}
.pager ul .active a:hover {color: #fff; border: #004781 solid 1px !important;}