/* ========================================
   企微能联 - 政企服务商轻量化配套站点
   全站样式文件
   风格：健身简约风 | 黑色 + 亮橙 + 纯白
   ======================================== */

/* CSS Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background-color: #0a0a0a;
    color: #ffffff;
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul, ol {
    list-style: none;
}

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

/* ========================================
   顶部导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 107, 0, 0.1);
    transition: all 0.4s ease;
}

.header.scrolled {
    background: rgba(10, 10, 10, 0.98);
    border-bottom: 1px solid rgba(255, 107, 0, 0.3);
    box-shadow: 0 4px 20px rgba(255, 107, 0, 0.1);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

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

.logo img {
    height: 45px;
    width: auto;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 1px;
}

.logo-text span {
    color: #ff6b00;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 500;
    color: #cccccc;
    border-radius: 4px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: #ff6b00;
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #ffffff;
    background: rgba(255, 107, 0, 0.1);
}

.nav-link:hover::before,
.nav-link.active::before {
    width: 60%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: #ffffff;
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ========================================
   首页 Hero Section
   ======================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0a0a0a 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 1200px;
    padding: 0 40px;
}

.hero-title {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #ffffff 0%, #ff6b00 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease forwards;
    opacity: 0;
}

.hero-subtitle {
    font-size: clamp(18px, 3vw, 24px);
    color: #999999;
    margin-bottom: 48px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1s ease 0.3s forwards;
    opacity: 0;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.6s forwards;
    opacity: 0;
}

.btn {
    display: inline-block;
    padding: 16px 40px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 6px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #ff6b00 0%, #ff8c00 100%);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(255, 107, 0, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 107, 0, 0.4);
}

.btn-secondary {
    background: transparent;
    color: #ffffff;
    border: 2px solid #ff6b00;
}

.btn-secondary:hover {
    background: rgba(255, 107, 0, 0.1);
    transform: translateY(-3px);
}

/* ========================================
   滚动动画
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease;
}

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

/* ========================================
   Section Styles
   ======================================== */
.section {
    padding: 100px 40px;
    position: relative;
}

.section-dark {
    background: #0a0a0a;
}

.section-light {
    background: #111111;
}

.section-accent {
    background: linear-gradient(135deg, #1a1a1a 0%, #0a0a0a 100%);
    border-top: 1px solid rgba(255, 107, 0, 0.1);
    border-bottom: 1px solid rgba(255, 107, 0, 0.1);
}

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

.section-tag {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(255, 107, 0, 0.1);
    color: #ff6b00;
    font-size: 14px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.section-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 16px;
    color: #999999;
    max-width: 700px;
    margin: 0 auto;
}

/* ========================================
   核心优势板块
   ======================================== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1400px;
    margin: 0 auto;
}

.advantage-card {
    background: linear-gradient(135deg, #1a1a1a 0%, #111111 100%);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 40px;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, #ff6b00, #ff8c00);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.advantage-card:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 107, 0, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.advantage-card:hover::before {
    transform: scaleX(1);
}

.advantage-icon {
    width: 70px;
    height: 70px;
    background: rgba(255, 107, 0, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.advantage-icon img {
    width: 40px;
    height: 40px;
}

.advantage-title {
    font-size: 22px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 12px;
}

.advantage-text {
    font-size: 15px;
    color: #999999;
    line-height: 1.8;
}

/* ========================================
   服务展示
   ======================================== */
.services-wrapper {
    max-width: 1400px;
    margin: 0 auto;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.service-card {
    background: #111111;
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.4s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.service-card:hover {
    transform: scale(1.02);
    border-color: rgba(255, 107, 0, 0.3);
}

.service-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    position: relative;
}

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.service-card:hover .service-image img {
    transform: scale(1.1);
}

.service-content {
    padding: 30px;
}

.service-category {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(255, 107, 0, 0.1);
    color: #ff6b00;
    font-size: 12px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 12px;
}

.service-title {
    font-size: 20px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 12px;
}

.service-desc {
    font-size: 14px;
    color: #999999;
    margin-bottom: 20px;
    line-height: 1.7;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #ff6b00;
    font-weight: 600;
    font-size: 14px;
}

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

/* ========================================
   解决方案
   ======================================== */
.solutions-container {
    max-width: 1400px;
    margin: 0 auto;
}

.solution-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
    padding: 60px;
    background: linear-gradient(135deg, #1a1a1a 0%, #111111 100%);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.4s ease;
}

.solution-item:last-child {
    margin-bottom: 0;
}

.solution-item:hover {
    border-color: rgba(255, 107, 0, 0.2);
    transform: translateX(10px);
}

.solution-item.reverse {
    direction: rtl;
}

.solution-item.reverse .solution-content {
    direction: ltr;
}

.solution-image {
    border-radius: 12px;
    overflow: hidden;
}

.solution-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.solution-content {
    padding: 20px;
}

.solution-label {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(255, 107, 0, 0.15);
    color: #ff6b00;
    font-size: 13px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 16px;
}

.solution-title {
    font-size: 32px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 20px;
}

.solution-text {
    font-size: 16px;
    color: #999999;
    line-height: 1.8;
    margin-bottom: 24px;
}

.solution-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.solution-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: #cccccc;
}

.solution-feature::before {
    content: '✓';
    color: #ff6b00;
    font-weight: 700;
}

/* ========================================
   案例展厅
   ======================================== */
.cases-wrapper {
    max-width: 1400px;
    margin: 0 auto;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
}

.case-card {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 16/10;
    cursor: pointer;
}

.case-image {
    width: 100%;
    height: 100%;
    transition: transform 0.5s ease;
}

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

.case-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 40px 30px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.9));
    transform: translateY(20px);
    transition: all 0.4s ease;
}

.case-card:hover .case-image {
    transform: scale(1.1);
}

.case-card:hover .case-overlay {
    transform: translateY(0);
}

.case-category {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(255, 107, 0, 0.9);
    color: #ffffff;
    font-size: 12px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 12px;
}

.case-title {
    font-size: 22px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 8px;
}

.case-client {
    font-size: 14px;
    color: #999999;
}

/* ========================================
   新闻资讯
   ======================================== */
.news-wrapper {
    max-width: 1400px;
    margin: 0 auto;
}

.news-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.news-tab {
    padding: 10px 24px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #999999;
    font-size: 14px;
    font-weight: 500;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.news-tab.active,
.news-tab:hover {
    background: rgba(255, 107, 0, 0.2);
    border-color: #ff6b00;
    color: #ffffff;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.news-card {
    background: #111111;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.4s ease;
}

.news-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 107, 0, 0.3);
}

.news-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.news-card:hover .news-image img {
    transform: scale(1.1);
}

.news-content {
    padding: 24px;
}

.news-date {
    font-size: 13px;
    color: #ff6b00;
    margin-bottom: 10px;
}

.news-title {
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 12px;
    line-height: 1.4;
}

.news-excerpt {
    font-size: 14px;
    color: #999999;
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========================================
   联系表单
   ======================================== */
.contact-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info {
    padding: 40px;
}

.contact-info-title {
    font-size: 36px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 20px;
}

.contact-info-text {
    font-size: 16px;
    color: #999999;
    line-height: 1.8;
    margin-bottom: 30px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: rgba(255, 107, 0, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-icon img {
    width: 24px;
    height: 24px;
}

.contact-label {
    font-size: 14px;
    color: #999999;
}

.contact-value {
    font-size: 16px;
    color: #ffffff;
    font-weight: 500;
}

.contact-form-wrapper {
    background: linear-gradient(135deg, #1a1a1a 0%, #111111 100%);
    border-radius: 16px;
    padding: 50px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    font-size: 14px;
    color: #cccccc;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 14px 18px;
    background: #0a0a0a;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: #ffffff;
    font-size: 15px;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: #ff6b00;
    box-shadow: 0 0 0 3px rgba(255, 107, 0, 0.1);
}

.form-textarea {
    min-height: 140px;
    resize: vertical;
}

.form-submit {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #ff6b00 0%, #ff8c00 100%);
    border: none;
    border-radius: 8px;
    color: #ffffff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.form-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 107, 0, 0.4);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: #050505;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 80px 40px 40px;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-brand {
    max-width: 350px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo img {
    height: 40px;
}

.footer-logo-text {
    font-size: 22px;
    font-weight: 700;
    color: #ffffff;
}

.footer-logo-text span {
    color: #ff6b00;
}

.footer-desc {
    font-size: 14px;
    color: #999999;
    line-height: 1.8;
    margin-bottom: 24px;
}

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

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: rgba(255, 107, 0, 0.2);
    transform: translateY(-3px);
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 24px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-link {
    font-size: 14px;
    color: #999999;
    transition: all 0.3s ease;
}

.footer-link:hover {
    color: #ff6b00;
    padding-left: 8px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-copyright {
    font-size: 14px;
    color: #666666;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal-link {
    font-size: 14px;
    color: #666666;
    transition: color 0.3s ease;
}

.footer-legal-link:hover {
    color: #ff6b00;
}

/* ========================================
   内页头部
   ======================================== */
.page-header {
    padding: 180px 40px 100px;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 107, 0, 0.05) 0%, transparent 70%);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.page-header-content {
    position: relative;
    z-index: 1;
}

.page-title {
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 16px;
}

.page-subtitle {
    font-size: 18px;
    color: #999999;
    max-width: 600px;
    margin: 0 auto;
}

.page-breadcrumb {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 24px;
    font-size: 14px;
    color: #666666;
}

.page-breadcrumb a {
    color: #ff6b00;
}

/* ========================================
   列表页面
   ======================================== */
.list-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px 100px;
}

.list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.list-card {
    background: #111111;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.4s ease;
}

.list-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 107, 0, 0.3);
}

.list-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
}

.list-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.list-card:hover .list-image img {
    transform: scale(1.1);
}

.list-content {
    padding: 24px;
}

.list-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-size: 13px;
    color: #666666;
}

.list-category {
    color: #ff6b00;
}

.list-title {
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 12px;
    line-height: 1.4;
}

.list-excerpt {
    font-size: 14px;
    color: #999999;
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========================================
   详情页面
   ======================================== */
.detail-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 40px 100px;
}

.detail-header {
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.detail-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 20px;
    line-height: 1.3;
}

.detail-meta {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.detail-date,
.detail-author,
.detail-category {
    font-size: 14px;
    color: #999999;
    display: flex;
    align-items: center;
    gap: 8px;
}

.detail-date::before,
.detail-author::before,
.detail-category::before {
    content: '';
    width: 8px;
    height: 8px;
    background: #ff6b00;
    border-radius: 50%;
}

.detail-cover {
    width: 100%;
    height: 500px;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 50px;
}

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

.detail-content {
    font-size: 17px;
    line-height: 1.9;
    color: #cccccc;
}

.detail-content p {
    margin-bottom: 24px;
}

.detail-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 30px 0;
}

.detail-content h2 {
    font-size: 26px;
    color: #ffffff;
    margin: 40px 0 20px;
}

.detail-content h3 {
    font-size: 22px;
    color: #ffffff;
    margin: 30px 0 16px;
}

.detail-content ul,
.detail-content ol {
    margin: 20px 0;
    padding-left: 24px;
}

.detail-content li {
    margin-bottom: 12px;
}

/* ========================================
   相关新闻
   ======================================== */
.related-news {
    margin-top: 80px;
    padding-top: 60px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.related-title {
    font-size: 28px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 40px;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1200px) {
    .header-container {
        padding: 0 30px;
    }
    
    .section {
        padding: 80px 30px;
    }
    
    .footer-top {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background: rgba(10, 10, 10, 0.98);
        flex-direction: column;
        padding: 30px;
        gap: 4px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.4s ease;
        border-bottom: 1px solid rgba(255, 107, 0, 0.2);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        padding: 16px 20px;
        text-align: center;
    }
    
    .hamburger {
        display: flex;
    }
    
    .solution-item {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .solution-item.reverse {
        direction: ltr;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 20px;
        height: 70px;
    }
    
    .logo-text {
        font-size: 20px;
    }
    
    .section {
        padding: 60px 20px;
    }
    
    .hero-section {
        padding-top: 70px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .solution-features {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        padding: 140px 20px 60px;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .list-container,
    .detail-container {
        padding: 0 20px 60px;
    }
    
    .detail-cover {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .advantage-card,
    .service-card,
    .contact-form-wrapper {
        padding: 24px;
    }
}

/* ========================================
   工具类
   ======================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 48px; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 48px; }