/**
 * 三众科技 GEO 优化专题网站 - 共用样式表
 * 版本：1.0
 * 最后更新：2026-04-05
 */

/* ==================== 重置与基础样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 色彩系统 */
    --primary-color: #1a3a5c;
    --secondary-color: #2563eb;
    --accent-color: #f97316;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #ffffff;
    --border-color: #e2e8f0;
    
    /* 设计令牌 */
    --border-radius: 16px;
    --shadow: 0 4px 24px rgba(0,0,0,0.06);
    --shadow-hover: 0 12px 40px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
    
    /* 字体 */
    --font-zh: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    --font-en: "Inter", "Helvetica Neue", Arial, sans-serif;
}

body {
    font-family: var(--font-zh), var(--font-en);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background: #ffffff;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 5%;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

.navbar-container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: var(--transition);
}

.logo img {
    height: 40px;
    width: auto;
    transition: var(--transition);
}

.navbar.scrolled .logo img {
    opacity: 0.95;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.navbar.scrolled .nav-menu a {
    color: var(--primary-color);
}

.nav-menu a:hover {
    color: var(--accent-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-light);
    border-radius: 2px;
    transition: var(--transition);
}

.navbar.scrolled .hamburger span {
    background: var(--primary-color);
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    text-align: center;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--text-light);
}

.btn-primary:hover {
    background: #ea580c;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(249, 115, 22, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-light);
    border: 2px solid var(--text-light);
}

.btn-secondary:hover {
    background: var(--text-light);
    color: var(--primary-color);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* ==================== 页面头部 Banner ==================== */
.page-banner {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 120px 5% 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
    background-size: 50px 50px;
    opacity: 0.3;
}

.page-banner-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.page-banner h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.page-banner p {
    font-size: 1.125rem;
    color: rgba(255,255,255,0.9);
}

/* ==================== 面包屑导航 ==================== */
.breadcrumb {
    background: var(--light-bg);
    padding: 1rem 5%;
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb-container {
    max-width: 1280px;
    margin: 0 auto;
}

.breadcrumb-list {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-size: 0.875rem;
}

.breadcrumb-list a {
    color: var(--text-secondary);
    transition: var(--transition);
}

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

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

.breadcrumb-list .current {
    color: var(--primary-color);
    font-weight: 500;
}

/* ==================== 通用区块样式 ==================== */
section {
    padding: 5rem 5%;
}

.section-container {
    max-width: 1280px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* ==================== 卡片样式 ==================== */
.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

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

/* ==================== 定义框样式（GEO 优化专用） ==================== */
.definition-box {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(26, 58, 92, 0.05));
    border-left: 4px solid var(--secondary-color);
    padding: 2rem;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    margin: 2rem 0;
}

.definition-box h4 {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.definition-box h4::before {
    content: '📖';
}

.definition-box p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==================== 问答样式（GEO 优化专用） ==================== */
.faq-section {
    margin: 3rem 0;
}

.faq-item {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.5rem 2rem;
    background: white;
    border: none;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--light-bg);
}

.faq-question .arrow {
    width: 20px;
    height: 20px;
    transition: var(--transition);
}

.faq-question[aria-expanded="true"] .arrow {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer-content {
    padding: 0 2rem 2rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==================== 表格样式 ==================== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    box-shadow: var(--shadow);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.data-table th,
.data-table td {
    padding: 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--primary-color);
    color: var(--text-light);
    font-weight: 600;
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table tr:nth-child(even) {
    background: var(--light-bg);
}

/* 套餐对比表专用 */
.pricing-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
}

.pricing-table th,
.pricing-table td {
    padding: 1.25rem;
    text-align: center;
    border: 1px solid var(--border-color);
}

.pricing-table th {
    background: var(--primary-color);
    color: var(--text-light);
}

.pricing-table th.feature {
    text-align: left;
    background: var(--light-bg);
    color: var(--text-primary);
}

.pricing-table tr:nth-child(even) {
    background: var(--light-bg);
}

.checkmark {
    color: #10b981;
    font-size: 1.25rem;
}

.cross {
    color: #ef4444;
    font-size: 1.25rem;
}

/* ==================== 步骤流程样式 ==================== */
.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.step-item {
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: var(--text-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step-item h4 {
    color: var(--primary-color);
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.step-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ==================== 数据卡片样式 ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.stat-card {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    color: var(--text-light);
}

.stat-card-value {
    font-size: 3rem;
    font-weight: 800;
    display: block;
    margin-bottom: 0.5rem;
}

.stat-card-label {
    font-size: 1rem;
    opacity: 0.9;
}

/* ==================== 标签样式 ==================== */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-primary {
    background: var(--secondary-color);
    color: var(--text-light);
}

.badge-accent {
    background: var(--accent-color);
    color: var(--text-light);
}

.badge-light {
    background: var(--light-bg);
    color: var(--text-primary);
}

/* ==================== 表单样式 ==================== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--primary-color);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
    border-color: #ef4444;
}

.form-error {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-success {
    background: #d1fae5;
    color: #065f46;
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    display: none;
}

.form-success.visible {
    display: block;
}

/* ==================== 时间线样式 ==================== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 3rem auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    background: var(--secondary-color);
}

.timeline-item {
    display: flex;
    justify-content: flex-end;
    padding: 1rem 0;
    position: relative;
    width: 50%;
}

.timeline-item:nth-child(even) {
    justify-content: flex-start;
    margin-left: 50%;
}

.timeline-content {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    max-width: 400px;
    margin: 0 2rem;
}

.timeline-dot {
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: -10px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -10px;
}

.timeline-year {
    font-size: 0.875rem;
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.timeline-title {
    font-size: 1.125rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.timeline-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ==================== 团队卡片样式 ==================== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.team-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.team-card:hover {
    transform: translateY(-8px);
}

.team-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
}

.team-content {
    padding: 2rem;
}

.team-name {
    font-size: 1.25rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.team-position {
    color: var(--secondary-color);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.team-bio {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==================== 资质网格样式 ==================== */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.cert-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.cert-card:hover {
    transform: translateY(-8px);
}

.cert-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.cert-title {
    font-size: 1rem;
    color: var(--primary-color);
    font-weight: 600;
}

/* ==================== 联系信息卡片 ==================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.contact-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-8px);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto 1.5rem;
}

.contact-title {
    font-size: 1.125rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.contact-info {
    color: var(--text-secondary);
}

/* ==================== 页脚样式 ==================== */
footer {
    background: var(--dark-bg);
    color: var(--text-light);
    padding: 4rem 5% 2rem;
}

.footer-grid {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.footer-col ul li {
    margin-bottom: 0.75rem;
}

.footer-col a {
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--accent-color);
}

.footer-contact p {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
    color: rgba(255,255,255,0.7);
}

.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    color: rgba(255,255,255,0.5);
    font-size: 0.875rem;
}

/* ==================== 回到顶部按钮 ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--accent-color);
    color: var(--text-light);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: #ea580c;
    transform: translateY(-5px);
}

/* ==================== 滚动渐入动画 ==================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ==================== CTA 区块 ==================== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 5rem 5%;
    text-align: center;
}

.cta-section h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    color: var(--text-light);
    margin-bottom: 1rem;
}

.cta-section p {
    color: rgba(255,255,255,0.9);
    font-size: 1.125rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-section .btn {
    margin: 0.5rem;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background: white;
        flex-direction: column;
        padding: 100px 2rem 2rem;
        gap: 1.5rem;
        transition: var(--transition);
        box-shadow: -5px 0 20px rgba(0,0,0,0.1);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-menu a {
        color: var(--primary-color);
        font-size: 1.25rem;
    }
    
    .hamburger {
        display: flex;
    }
    
    .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, -6px);
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 50px;
    }
    
    .timeline-item:nth-child(even) {
        margin-left: 0;
    }
    
    .timeline-dot {
        left: 10px !important;
        right: auto !important;
    }
    
    .timeline-content {
        margin: 0;
        max-width: none;
    }
}

@media (max-width: 768px) {
    section {
        padding: 3rem 5%;
    }
    
    .page-banner {
        padding: 100px 5% 40px;
    }
    
    .comparison-table {
        font-size: 0.875rem;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .steps-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ==================== 打印样式 ==================== */
@media print {
    .navbar,
    .back-to-top,
    .cta-section {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    a {
        text-decoration: underline;
    }
}