/* 上海商标代办网站 - 主样式文件 */

/* CSS变量定义 */
:root {
    --primary-color: #1a5fb4;
    --primary-dark: #0d3a7a;
    --primary-light: #3584e4;
    --secondary-color: #26a269;
    --accent-color: #e5a50a;
    --text-color: #333333;
    --text-light: #666666;
    --text-muted: #999999;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --bg-gray: #e9ecef;
    --border-color: #dee2e6;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

a:hover {
    color: var(--primary-dark);
}

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

ul, ol {
    list-style: none;
}

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

/* 顶部导航栏 */
.header {
    background: var(--bg-color);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.header-top {
    background: var(--primary-dark);
    color: #fff;
    padding: 8px 0;
    font-size: 14px;
}

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

.header-top a {
    color: #fff;
}

.header-top a:hover {
    color: var(--accent-color);
}

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

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

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

.logo-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 24px;
    font-weight: bold;
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-dark);
}

.logo-text span {
    color: var(--secondary-color);
}

/* 导航菜单 */
.nav {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav a {
    color: var(--text-color);
    font-weight: 500;
    padding: 10px 0;
    position: relative;
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav a:hover::after,
.nav a.active::after {
    width: 100%;
}

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

/* 下拉菜单 */
.nav-item {
    position: relative;
}

.dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-color);
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 100;
}

.nav-item:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown a {
    display: block;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
}

.dropdown a:last-child {
    border-bottom: none;
}

.dropdown a:hover {
    background: var(--bg-light);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    border-radius: 2px;
    transition: var(--transition);
}

/* Banner横幅 */
.banner {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: #fff;
    padding: 120px 0 80px;
    margin-top: 100px;
    position: relative;
    overflow: hidden;
}

.banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.banner .container {
    position: relative;
    z-index: 1;
}

.banner h1 {
    font-size: 48px;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease;
}

.banner p {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 30px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.banner-stats {
    display: flex;
    gap: 60px;
    margin-top: 40px;
    animation: fadeInUp 0.8s ease 0.4s both;
}

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

.stat-number {
    font-size: 42px;
    font-weight: bold;
    color: var(--accent-color);
}

.stat-label {
    font-size: 14px;
    opacity: 0.8;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
}

.btn-primary {
    background: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--secondary-color);
    color: #fff;
}

.btn-secondary:hover {
    background: #1e7e4f;
    color: #fff;
    transform: translateY(-2px);
}

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

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

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

/* 区块标题 */
.section {
    padding: 80px 0;
}

.section-gray {
    background: var(--bg-light);
}

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

.section-title h2 {
    font-size: 36px;
    color: var(--text-color);
    margin-bottom: 15px;
}

.section-title p {
    font-size: 18px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

.section-title .line {
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    margin: 20px auto 0;
    border-radius: 2px;
}

/* 服务卡片 */
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 36px;
    color: #fff;
}

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

.service-card p {
    color: var(--text-light);
    font-size: 15px;
}

/* 优势展示 */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.advantage-item {
    display: flex;
    gap: 25px;
    padding: 30px;
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.advantage-item:hover {
    box-shadow: var(--shadow-lg);
}

.advantage-num {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    flex-shrink: 0;
}

.advantage-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-color);
}

.advantage-content p {
    color: var(--text-light);
    font-size: 15px;
}

/* 价格表格 */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

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

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

.pricing-card.featured {
    border: 3px solid var(--primary-color);
    position: relative;
}

.pricing-card.featured::before {
    content: '推荐';
    position: absolute;
    top: 20px;
    right: -30px;
    background: var(--accent-color);
    color: #fff;
    padding: 5px 40px;
    font-size: 14px;
    transform: rotate(45deg);
}

.pricing-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff;
    padding: 30px;
    text-align: center;
}

.pricing-header h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

.pricing-header .price {
    font-size: 48px;
    font-weight: bold;
}

.pricing-header .price span {
    font-size: 18px;
    font-weight: normal;
}

.pricing-body {
    padding: 30px;
}

.pricing-body ul li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.pricing-body ul li:last-child {
    border-bottom: none;
}

.pricing-body ul li::before {
    content: '✓';
    color: var(--secondary-color);
    font-weight: bold;
}

.pricing-footer {
    padding: 0 30px 30px;
    text-align: center;
}

/* 特点展示 */
.feature-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.feature-image {
    position: relative;
}

.feature-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.feature-content h2 {
    font-size: 36px;
    margin-bottom: 20px;
    color: var(--text-color);
}

.feature-content p {
    color: var(--text-light);
    margin-bottom: 30px;
}

.feature-list {
    margin-bottom: 30px;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 20px;
}

.feature-list li .icon {
    width: 30px;
    height: 30px;
    background: var(--secondary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 14px;
}

/* 关于我们 */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-content h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.about-content p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.about-stats {
    display: flex;
    gap: 40px;
    margin-top: 30px;
}

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

.about-stat .num {
    font-size: 36px;
    font-weight: bold;
    color: var(--primary-color);
}

.about-stat .label {
    color: var(--text-light);
    font-size: 14px;
}

/* 文章列表 */
.article-list {
    display: grid;
    gap: 30px;
}

.article-item {
    display: flex;
    gap: 30px;
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.article-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(5px);
}

.article-thumb {
    width: 280px;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 48px;
}

.article-content {
    padding: 30px;
    flex: 1;
}

.article-content h3 {
    font-size: 22px;
    margin-bottom: 15px;
}

.article-content h3 a {
    color: var(--text-color);
}

.article-content h3 a:hover {
    color: var(--primary-color);
}

.article-content p {
    color: var(--text-light);
    font-size: 15px;
    margin-bottom: 15px;
}

.article-meta {
    display: flex;
    gap: 20px;
    color: var(--text-muted);
    font-size: 14px;
}

/* 区县网格 */
.district-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 25px;
}

.district-card {
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 2px solid transparent;
}

.district-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.district-card .icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
    color: #fff;
}

.district-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-color);
}

.district-card p {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 15px;
}

/* 白皮书 */
.whitepaper-header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    color: #fff;
    padding: 100px 0 60px;
    margin-top: 100px;
    text-align: center;
}

.whitepaper-header h1 {
    font-size: 42px;
    margin-bottom: 20px;
}

.whitepaper-header p {
    font-size: 18px;
    opacity: 0.9;
}

.whitepaper-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 20px;
}

.whitepaper-content h2 {
    font-size: 28px;
    color: var(--primary-dark);
    margin: 40px 0 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--primary-color);
}

.whitepaper-content h3 {
    font-size: 22px;
    color: var(--text-color);
    margin: 30px 0 15px;
}

.whitepaper-content p {
    margin-bottom: 20px;
    text-align: justify;
}

.whitepaper-content ul,
.whitepaper-content ol {
    margin: 20px 0;
    padding-left: 30px;
}

.whitepaper-content li {
    margin-bottom: 10px;
    list-style: disc;
}

.whitepaper-content ol li {
    list-style: decimal;
}

/* 文章详情页 */
.article-detail {
    max-width: 900px;
    margin: 0 auto;
    padding: 120px 20px 60px;
}

.article-detail h1 {
    font-size: 36px;
    margin-bottom: 20px;
    color: var(--text-color);
}

.article-meta {
    display: flex;
    gap: 30px;
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.article-body {
    font-size: 17px;
    line-height: 2;
}

.article-body h2 {
    font-size: 26px;
    color: var(--primary-dark);
    margin: 40px 0 20px;
}

.article-body h3 {
    font-size: 22px;
    color: var(--text-color);
    margin: 30px 0 15px;
}

.article-body p {
    margin-bottom: 20px;
}

.article-body ul,
.article-body ol {
    margin: 20px 0;
    padding-left: 30px;
}

.article-body li {
    margin-bottom: 10px;
    list-style: disc;
}

.article-body ol li {
    list-style: decimal;
}

.article-body .highlight-box {
    background: var(--bg-light);
    border-left: 4px solid var(--primary-color);
    padding: 20px 25px;
    margin: 25px 0;
    border-radius: 0 var(--radius) var(--radius) 0;
}

/* 联系表单 */
.contact-section {
    background: var(--bg-light);
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3 {
    font-size: 28px;
    margin-bottom: 20px;
}

.contact-info p {
    color: var(--text-light);
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.contact-item .icon {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.contact-item .text h4 {
    font-size: 16px;
    margin-bottom: 5px;
}

.contact-item .text p {
    color: var(--text-light);
    font-size: 15px;
    margin: 0;
}

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

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

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

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 16px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 95, 180, 0.1);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* 页脚 */
.footer {
    background: var(--primary-dark);
    color: #fff;
    padding: 60px 0 0;
}

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

.footer-brand h3 {
    font-size: 24px;
    margin-bottom: 20px;
}

.footer-brand p {
    opacity: 0.8;
    font-size: 15px;
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 18px;
    margin-bottom: 20px;
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 15px;
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 0;
    text-align: center;
    font-size: 14px;
    opacity: 0.7;
}

/* 面包屑导航 */
.breadcrumb {
    background: var(--bg-light);
    padding: 15px 0;
    margin-top: 100px;
}

.breadcrumb ul {
    display: flex;
    gap: 10px;
    font-size: 14px;
}

.breadcrumb li::after {
    content: '>';
    margin-left: 10px;
    color: var(--text-muted);
}

.breadcrumb li:last-child::after {
    display: none;
}

.breadcrumb a {
    color: var(--text-light);
}

.breadcrumb a:hover {
    color: var(--primary-color);
}

.breadcrumb li:last-child {
    color: var(--text-color);
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* 响应式设计 */
@media (max-width: 992px) {
    .nav {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .banner h1 {
        font-size: 36px;
    }

    .banner-stats {
        flex-wrap: wrap;
        gap: 30px;
    }

    .advantage-grid,
    .feature-showcase,
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .banner {
        padding: 100px 0 60px;
    }

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

    .section {
        padding: 50px 0;
    }

    .section-title h2 {
        font-size: 28px;
    }

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

    .article-thumb {
        width: 100%;
        height: 150px;
    }

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

/* 工具类 */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.mt-40 {
    margin-top: 40px;
}

.mb-40 {
    margin-bottom: 40px;
}