/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a1a1a;
    --secondary-color: #d4af37;
    --text-dark: #333333;
    --text-light: #666666;
    --bg-white: #ffffff;
    --bg-light: #f5f5f5;
    --border-color: #e0e0e0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

/* 顶部导航 */
.site-header {
    background: var(--bg-white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    background: var(--primary-color);
    color: var(--bg-white);
    padding: 10px 0;
}

.header-info {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
}

.tel-icon {
    font-size: 16px;
}

.main-nav {
    padding: 15px 0;
}

.main-nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo img {
    height: 50px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.nav-menu > li {
    position: relative;
}

.nav-menu a {
    color: var(--text-dark);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
    padding: 10px 0;
    display: block;
}

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

.has-submenu .submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-white);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    list-style: none;
    min-width: 180px;
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.has-submenu:hover .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.submenu li {
    padding: 0;
}

.submenu a {
    padding: 12px 20px;
    display: block;
}

.mobile-menu-toggle {
    display: none;
}

.mobile-menu-icon {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-menu-icon span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: all 0.3s ease;
}

/* 轮播图 */
.banner-section {
    position: relative;
    height: 600px;
    overflow: hidden;
}

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

.banner-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease;
}

.banner-item.active {
    opacity: 1;
    z-index: 1;
}

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

.banner-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--bg-white);
    z-index: 2;
    background: rgba(0, 0, 0, 0.5);
    padding: 40px 60px;
    border-radius: 10px;
}

.banner-content h1 {
    font-size: 42px;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.banner-content p {
    font-size: 20px;
}

.banner-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 3;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: background 0.3s ease;
}

.dot.active {
    background: var(--secondary-color);
}

/* 通用区块样式 */
section {
    padding: 80px 0;
}

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

.section-header h2 {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
    padding-bottom: 15px;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--secondary-color);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-light);
}

/* 关于天美传媒 */
.about-section {
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h3 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.about-text p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 20px;
}

.more-btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--secondary-color);
    color: var(--bg-white);
    text-decoration: none;
    border-radius: 5px;
    margin-top: 20px;
    transition: background 0.3s ease;
}

.more-btn:hover {
    background: #b8941f;
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

/* 主营业务 */
.services-section {
    background: var(--bg-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.service-item {
    background: var(--bg-white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.service-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

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

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.service-content {
    padding: 25px;
}

.service-content h3 {
    font-size: 22px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.service-content p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-link {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.service-link:hover {
    color: #b8941f;
}

/* 新闻资讯 */
.news-section {
    background: var(--bg-light);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.news-item {
    background: var(--bg-white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    transition: transform 0.3s ease;
}

.news-item:hover {
    transform: translateY(-5px);
}

.news-image {
    width: 200px;
    height: 150px;
    flex-shrink: 0;
    overflow: hidden;
}

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

.news-content {
    padding: 20px;
    flex: 1;
}

.news-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.news-content h3 a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.news-content h3 a:hover {
    color: var(--secondary-color);
}

.news-excerpt {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 15px;
}

.news-date {
    font-size: 12px;
    color: var(--text-light);
}

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

/* 经典案例 */
.cases-section {
    background: var(--bg-white);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.case-item {
    background: var(--bg-white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.case-item:hover {
    transform: translateY(-5px);
}

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

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.case-title {
    padding: 15px;
    text-align: center;
}

.case-title a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
}

.case-title a:hover {
    color: var(--secondary-color);
}

/* 页脚 */
.site-footer {
    background: var(--primary-color);
    color: var(--bg-white);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-contact h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.footer-tel {
    font-size: 28px;
    font-weight: bold;
    color: var(--secondary-color);
    margin: 15px 0;
}

.footer-address {
    font-size: 14px;
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.footer-links ul {
    list-style: none;
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--secondary-color);
}

.footer-info h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.footer-info p {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.8);
}

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

.footer-bottom a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .mobile-menu-icon {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        flex-direction: column;
        background: var(--bg-white);
        width: 100%;
        height: calc(100vh - 80px);
        padding: 20px;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
        transition: left 0.3s ease;
        overflow-y: auto;
    }

    .mobile-menu-toggle:checked ~ .nav-menu {
        left: 0;
    }

    .mobile-menu-toggle:checked ~ .mobile-menu-icon span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-toggle:checked ~ .mobile-menu-icon span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle:checked ~ .mobile-menu-icon span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .has-submenu .submenu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding-left: 20px;
    }

    .banner-section {
        height: 400px;
    }

    .banner-content {
        padding: 20px 30px;
    }

    .banner-content h1 {
        font-size: 28px;
    }

    .banner-content p {
        font-size: 16px;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .news-grid {
        grid-template-columns: 1fr;
    }

    .news-item {
        flex-direction: column;
    }

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

    .cases-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* 轮播图自动播放（纯CSS实现） */
@keyframes slideShow {
    0%, 100% { opacity: 0; }
    33.33% { opacity: 1; }
}

.banner-item:nth-child(1) {
    animation: slideShow 9s infinite;
}

.banner-item:nth-child(2) {
    animation: slideShow 9s infinite 3s;
}

.banner-item:nth-child(3) {
    animation: slideShow 9s infinite 6s;
}

/* 页面横幅 */
.page-banner {
    position: relative;
    height: 400px;
    overflow: hidden;
    margin-top: 0;
}

.banner-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

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

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 26, 26, 0.8), rgba(26, 26, 26, 0.6));
}

.banner-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--bg-white);
    z-index: 2;
}

.banner-text h1 {
    font-size: 48px;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.banner-text p {
    font-size: 20px;
}

/* 内容页面样式 */
.about-page-section,
.content-section {
    padding: 80px 0;
    background: var(--bg-white);
}

.page-nav {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
    justify-content: center;
}

.nav-btn {
    padding: 12px 30px;
    background: var(--bg-light);
    color: var(--text-dark);
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.nav-btn:hover,
.nav-btn.active {
    background: var(--secondary-color);
    color: var(--bg-white);
}

.about-intro,
.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.about-intro h2,
.content-wrapper h2 {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.content-wrapper h3 {
    font-size: 24px;
    color: var(--primary-color);
    margin: 30px 0 20px;
}

.about-intro p,
.content-wrapper p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 20px;
}

.content-wrapper ul {
    margin-left: 30px;
    margin-bottom: 25px;
}

.content-wrapper li {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 12px;
}

.cases-intro,
.news-intro,
.contact-intro {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
    text-align: center;
    margin-top: 40px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.faq-item {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h3 {
    font-size: 22px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.faq-item p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.contact-info h2,
.contact-form h2 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 30px;
}

.info-item {
    margin-bottom: 30px;
}

.info-item h3 {
    font-size: 18px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.info-item p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
}

.contact-tel {
    font-size: 24px;
    font-weight: bold;
    color: var(--secondary-color);
}

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

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 14px;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
}

.submit-btn {
    padding: 14px 30px;
    background: var(--secondary-color);
    color: var(--bg-white);
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s ease;
}

.submit-btn:hover {
    background: #b8941f;
}

@media (max-width: 768px) {
    .contact-content {
        grid-template-columns: 1fr;
    }
}