/* ==========================================
   先进数智有限公司 - 企业网站样式
   主色调: 蓝色系 (#0066CC, #0055AA, #0088FF)
   ========================================== */

:root {
    --primary: #0066CC;
    --primary-dark: #004499;
    --primary-light: #0088FF;
    --primary-lighter: #66B3FF;
    --primary-bg: #E6F2FF;
    --secondary: #00AA88;
    --accent: #FF6B35;
    --text-primary: #1A1A2E;
    --text-secondary: #4A5568;
    --text-muted: #718096;
    --bg-white: #FFFFFF;
    --bg-light: #F7FAFC;
    --bg-gray: #EDF2F7;
    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-blue: 0 10px 40px -10px rgba(0, 102, 204, 0.3);
    --radius-sm: 4px;
    --radius: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    --transition-fast: 0.15s ease;
    --transition: 0.3s ease;
    --transition-slow: 0.5s ease;
    --container-width: 1200px;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-white);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

input, textarea, select {
    font-family: inherit;
    outline: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section-header {
    text-align: center;
    margin-bottom: 30px;
}

.section-tag {
    display: inline-block;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 14px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius);
    transition: var(--transition);
    text-align: center;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-blue);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-outline:hover {
    background: white;
    color: var(--primary);
}

.btn-lg {
    padding: 18px 40px;
    font-size: 18px;
}

.btn-block {
    width: 100%;
}

/* 头部导航 - 深蓝色背景 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: linear-gradient(135deg, #0a1628 0%, #1a365d 100%);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    padding-left: 20px;
    padding-right: 20px;
}

.logo {
    display: flex;
    align-items: center;
    margin-left: 0;
    flex-shrink: 0;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-right: 0;
}

.logo {
    display: flex;
    align-items: center;
    margin-left: 0;
}

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

.logo img {
    max-width: 100%;
    height: auto;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-size: 20px;
    font-weight: 700;
    color: white;
}

.logo-sub {
    font-size: 10px;
    color: rgba(255,255,255,0.6);
    letter-spacing: 1px;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-left: auto;
}

.nav-item {
    position: relative;
}

.nav-item a {
    font-size: 15px;
    font-weight: 500;
    color: rgba(255,255,255,0.8);
    transition: var(--transition);
    position: relative;
    display: block;
    padding: 10px 0;
}

.nav-item a:hover,
.nav-item.active a {
    color: #63b3ed;
}

.has-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute !important;
    top: 100% !important;
    left: 0 !important;
    background: rgba(10,22,40,0.95) !important;
    border: 1px solid rgba(255,255,255,0.1) !important;
    min-width: 200px !important;
    display: none !important;
    z-index: 1000 !important;
}

.has-dropdown:hover .dropdown-menu {
    display: block !important;
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    font-size: 14px;
    color: rgba(255,255,255,0.8);
}

.dropdown-menu a:hover {
    background: rgba(255,255,255,0.1);
    color: white;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: white;
    transition: var(--transition);
}

/* 轮播Banner */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    overflow: hidden;
}

.hero-slider {
    position: relative;
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 1s ease, visibility 1s ease;
}

.hero-slide.active {
    opacity: 1;
    visibility: visible;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transform: scale(1.1);
    transition: transform 8s ease;
}

.hero-slide.active .hero-bg {
    transform: scale(1);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 68, 153, 0.9) 0%, rgba(0, 102, 204, 0.8) 50%, rgba(0, 136, 255, 0.7) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    height: 100%;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-title {

.hero-title {
    font-size: 56px;
    font-weight: 700;
    color: var(--bg-white);
    line-height: 1.2;
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.hero-slide.active .hero-title {
    opacity: 1;
    transform: translateY(0);
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
    line-height: 1.6;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease 0.2s;
}

.hero-slide.active .hero-subtitle {
    opacity: 1;
    transform: translateY(0);
}

.hero-buttons {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease 0.4s;
}

.hero-slide.active .hero-buttons {
    opacity: 1;
    transform: translateY(0);
}

.highlight {
    color: var(--primary-light);
}

.hero-nav {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 10;
}

.hero-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.hero-dot.active {
    background: var(--bg-white);
    width: 32px;
    border-radius: 6px;
}

.hero-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    color: #0066CC;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.hero-arrow:hover {
    background: white;
    transform: translateY(-50%) scale(1.1);
}

.hero-prev { left: 20px; }
.hero-next { right: 20px; }

@media (max-width: 768px) {
    .hero-arrow { display: none; }
}

/* 产品服务 */
.products {
    padding: 80px 0;
    background: white;
}

.products .section-title {
    color: #0066CC;
    text-align: center;
}

.products .section-desc {
    color: #666;
    text-align: center;
}

/* .products-grid removed - using inline styles instead */
}

/* .product-card styles removed - using inline styles instead */

.product-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, var(--primary-bg) 0%, rgba(0, 136, 255, 0.1) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--primary);
}

.product-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.product-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
    line-height: 1.8;
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 24px;
}

.product-features span {
    padding: 6px 12px;
    background: var(--primary-bg);
    color: var(--primary);
    font-size: 12px;
    border-radius: var(--radius-full);
}

.product-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.product-link:hover {
    gap: 12px;
}

/* 解决方案 */
.solutions {
    padding: 100px 0;
    background: var(--bg-light);
}

.tabs-nav {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.tabs-content {
    max-width: 1000px;
    margin: 0 auto;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block !important;
    animation: fadeIn 0.5s ease;
}
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.solution-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
}

.solution-image svg {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

.solution-text h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.solution-text p {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 20px;
}

.solution-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.sol-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.sol-feature i {
    color: var(--primary);
}

/* 成功案例 */
.cases {
    padding: 100px 0;
}

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

.case-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.case-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.case-img-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: white;
}

.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 102, 204, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.case-card:hover .case-overlay {
    opacity: 1;
}

.case-link {
    width: 50px;
    height: 50px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 18px;
    transform: scale(0);
    transition: var(--transition);
}

.case-card:hover .case-link {
    transform: scale(1);
}

.case-content {
    padding: 24px;
}

.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-bg);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 12px;
}

.case-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.case-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 16px;
    line-height: 1.6;
}

.case-stats {
    display: flex;
    gap: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.c-stat {
    text-align: center;
}

.c-num {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.c-label {
    font-size: 12px;
    color: var(--text-muted);
}

/* 新闻动态 */
.news {
    padding: 100px 0;
    background: var(--bg-light);
}

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

.news-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.news-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-content {
    padding: 20px;
}

.news-date {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 8px;
    display: block;
}

.news-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-link {
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.news-link:hover {
    gap: 10px;
}

/* 关于我们 */
.about {
    padding: 100px 0;
}

/* 强制覆盖原有两栏布局，让白色容器支持内容居中 */
.about-content {
    /* 取消原有grid两栏布局，改为flex垂直居中布局 */
    display: flex !important;
    flex-direction: column !important;
    justify-content: center !important; /* 垂直居中 */
    align-items: center !important;     /* 水平居中 */
    background: rgba(255,255,255,0.97);
    border-radius: 16px;
    padding: 60px 40px !important; /* 上下内边距加大，给垂直居中留空间 */
    margin: 0 20px 60px;
    box-shadow: 0 4px 30px rgba(0,0,0,0.2);
    min-height: 500px; /* 可选：固定最小高度，让垂直居中效果更明显 */
    width: calc(100% - 40px);
    max-width: 900px;
    margin-left: auto !important;
    margin-right: auto !important;
}

/* 核心：让内容容器本身在父级里居中，内部所有元素也居中 */
.about-text {
    text-align: center !important; /* 所有文字强制水平居中 */
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important; /* 所有块级子元素水平居中 */
    justify-content: center !important;
    width: 100% !important;
    max-width: 800px; /* 限制内容最大宽度，避免文字过长拉满屏幕 */
}

/* 标题强制居中 */
.about-text h3 {
    color: #1a365d;
    font-size: 28px;
    margin-bottom: 24px !important;
    width: 100%;
    text-align: center !important;
}

/* 段落文字居中，限制宽度+自动左右居中 */
.about-text p {
    color: #4a5568;
    line-height: 1.8;
    max-width: 700px !important;
    margin: 0 auto 20px !important; /* 上下间距 + 左右auto强制居中 */
    text-align: center !important;
}

/* 特性列表强制水平居中排列 */
.about-features {
    display: flex !important;
    justify-content: center !important; /* 整体居中 */
    gap: 40px !important;
    margin: 30px 0 !important;
    flex-wrap: wrap !important;
    width: 100% !important;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #2c5282;
    font-size: 16px;
}

.about-feature i {
    color: #3182ce;
    font-size: 24px;
}

/* 按钮强制居中 */
.about-text .btn {
    margin: 20px auto 0 !important; /* 左右auto强制居中 */
    display: inline-block !important;
}

.af-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.af-item i {
    color: var(--primary);
    font-size: 18px;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    flex-shrink: 0;
}

.contact-detail h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.contact-detail p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

.contact-form {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
}

.contact-form h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
}

/* 页脚 */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 60px 0 30px;
}

.footer-logo-section {
    margin-bottom: 30px;
}

.footer-logo-section .footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo-section .footer-logo span {
    font-size: 20px;
    font-weight: 700;
    color: white;
}

.footer-logo-section .footer-desc {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
}

.footer-links-row {
    display: flex;
    justify-content: space-between;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-links-col {
    flex: 1;
    text-align: left;
}

.footer-links-col:not(:last-child) {
    margin-right: 40px;
}

.footer-links-col h4 {
    color: white;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-links-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links-col ul li {
    margin-bottom: 10px;
}

.footer-links-col ul li a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 14px;
}

.footer-links-col ul li a:hover {
    color: white;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.footer-social a:hover {
    background: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    margin-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.6);
    font-size: 14px;
}

.footer-bottom a {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: white;
}

/* 响应式 */
@media (max-width: 1200px) {
    .products-grid,
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .nav-list {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .solution-content,
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .products-grid,
    .cases-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .tab-btn {
        flex: 1 1 100%;
    }
    
    .solution-features {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .logo-sub {
        display: none;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .contact-form-wrapper {
        padding: 24px;
    }
}

/* 动画 */
.animate-fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.animate-fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }
.delay-3 { transition-delay: 0.6s; }

/* 移动端菜单 */
.nav.active {
    display: block;
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: white;
    padding: 20px;
    box-shadow: var(--shadow-md);
}

.nav.active .nav-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}