/* 
 * 青岛商建 - 营销型企业官网定制与电商场景数字化建站服务
 * 全局样式表 - 红黑力量感+高亮点缀风格
 * 右侧垂直导航 + 左侧卡片流动布局
 */

/* ==================== CSS Reset & 基础变量 ==================== */
:root {
    --primary-red: #ff3333;
    --primary-dark: #cc0000;
    --accent-orange: #ff6600;
    --bg-black: #0a0505;
    --bg-dark: #1a0a0a;
    --bg-card: #2a1515;
    --text-white: #ffffff;
    --text-gray: #cccccc;
    --text-muted: #888888;
    --border-color: #442222;
    --shadow-red: rgba(255, 51, 51, 0.3);
    --transition-speed: 0.3s;
    --nav-width: 260px;
}

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

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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-black);
    color: var(--text-white);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

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

ul, ol {
    list-style: none;
}

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

/* ==================== 右侧垂直导航 ==================== */
.sidebar-nav,
.vertical-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: var(--nav-width);
    height: 100vh;
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-black) 100%);
    border-left: 2px solid var(--primary-red);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    transition: transform var(--transition-speed) ease;
}

.nav-header {
    padding: 30px 20px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.logo-link img {
    width: 150px;
    height: 50px;
    object-fit: contain;
}

.mobile-toggle,
.menu-toggle {
    display: none;
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 1001;
    width: 50px;
    height: 50px;
    background: var(--primary-red);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all var(--transition-speed) ease;
}

.mobile-toggle span,
.menu-toggle span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--text-white);
    border-radius: 2px;
    transition: all var(--transition-speed) ease;
}

.mobile-toggle.active span:nth-child(1),
.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-toggle.active span:nth-child(2),
.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

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

.nav-menu,
.sidebar-nav .nav-menu {
    flex: 1;
    padding: 20px 0;
}

.nav-menu li,
.nav-menu > li {
    margin: 8px 15px;
}

.nav-menu a,
.nav-link,
.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--text-gray);
    font-size: 0.95rem;
    font-weight: 500;
    border: 1px solid transparent;
    transition: all var(--transition-speed) ease;
}

.nav-menu a:hover,
.nav-menu a.active,
.nav-link:hover,
.nav-link.active {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
    border-color: var(--accent-orange);
    transform: translateX(-5px);
    box-shadow: 0 4px 15px var(--shadow-red);
}

.nav-icon {
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
}

.nav-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.nav-footer p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 5px 0;
}

/* ==================== 主内容区域 - 左侧卡片流动布局 ==================== */
.main-content {
    margin-right: var(--nav-width);
    min-height: 100vh;
    padding: 40px;
    background: var(--bg-black);
}

/* 页面头部通用样式 */
.page-header {
    position: relative;
    height: 50vh;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-bottom: 60px;
    border-radius: 20px;
    border: 2px solid var(--primary-red);
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-black) 100%);
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('../images/bg-main.jpg') center/cover;
    opacity: 0.1;
}

.header-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    padding: 40px;
}

.header-content h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--text-white) 0%, var(--primary-red) 50%, var(--accent-orange) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-content .subtitle {
    font-size: 1.3rem;
    color: var(--text-gray);
    margin-bottom: 20px;
}

.breadcrumb {
    font-size: 0.95rem;
    color: var(--text-muted);
}

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

.breadcrumb a:hover {
    text-decoration: underline;
}

/* 容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 关于我们 - 简介区域 */
.about-intro {
    padding: 80px 0;
}

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

.intro-image img {
    width: 100%;
    border-radius: 16px;
    border: 2px solid var(--primary-red);
    box-shadow: 0 10px 40px var(--shadow-red);
}

.intro-content h2 {
    font-size: 2.2rem;
    color: var(--primary-red);
    margin-bottom: 25px;
}

.intro-content p {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 20px;
    font-size: 1.05rem;
}

.intro-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 25px 15px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-speed) ease;
}

.stat-item:hover {
    border-color: var(--primary-red);
    transform: translateY(-5px);
}

.stat-num {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-red);
    margin-bottom: 8px;
}

.stat-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* 企业文化板块 */
.culture-section {
    padding: 80px 0;
    background: var(--bg-dark);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    color: var(--text-white);
    margin-bottom: 50px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-red), var(--accent-orange));
    border-radius: 2px;
}

.culture-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.culture-card {
    background: var(--bg-card);
    padding: 40px 25px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all var(--transition-speed) ease;
}

.culture-card:hover {
    border-color: var(--primary-red);
    transform: translateY(-10px);
    box-shadow: 0 10px 40px var(--shadow-red);
}

.culture-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.culture-card h3 {
    color: var(--primary-red);
    font-size: 1.4rem;
    margin-bottom: 15px;
}

.culture-card p {
    color: var(--text-gray);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* 时间线 */
.timeline-section {
    padding: 80px 0;
}

.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-red), var(--accent-orange));
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
    width: 50%;
    padding: 0 40px;
}

.timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
}

.timeline-item:nth-child(even) {
    left: 50%;
    text-align: left;
}

.timeline-year {
    position: absolute;
    top: 0;
    width: 80px;
    height: 80px;
    background: var(--primary-red);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-white);
    border: 4px solid var(--bg-black);
    z-index: 2;
}

.timeline-item:nth-child(odd) .timeline-year {
    right: -40px;
}

.timeline-item:nth-child(even) .timeline-year {
    left: -40px;
}

.timeline-content {
    background: var(--bg-card);
    padding: 30px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-speed) ease;
}

.timeline-content:hover {
    border-color: var(--primary-red);
    box-shadow: 0 10px 40px var(--shadow-red);
}

.timeline-content h3 {
    color: var(--primary-red);
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.timeline-content p {
    color: var(--text-gray);
    line-height: 1.7;
}

/* 荣誉资质 */
.honors-section {
    padding: 80px 0;
    background: var(--bg-dark);
}

.honors-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.honor-card {
    background: var(--bg-card);
    padding: 40px 25px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all var(--transition-speed) ease;
}

.honor-card:hover {
    border-color: var(--primary-red);
    transform: translateY(-10px);
    box-shadow: 0 10px 40px var(--shadow-red);
}

.honor-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.honor-card h4 {
    color: var(--primary-red);
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.honor-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* CTA 板块 */
.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--primary-dark) 100%);
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.5rem;
    color: var(--text-white);
    margin-bottom: 15px;
}

.cta-content p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* 页脚样式增强 */
.site-footer {
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-black) 100%);
    border-top: 2px solid var(--primary-red);
    padding: 60px 40px 30px;
    margin-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto 40px;
}

.footer-about img {
    margin-bottom: 20px;
}

.footer-about p {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-contact p {
    color: var(--text-muted);
    margin: 8px 0;
    font-size: 0.95rem;
}

.footer-links h4,
.footer-newsletter h4 {
    color: var(--primary-red);
    font-size: 1.2rem;
    margin-bottom: 20px;
}

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

.footer-links li {
    margin: 12px 0;
}

.footer-links a {
    color: var(--text-gray);
    font-size: 0.95rem;
    transition: all var(--transition-speed) ease;
}

.footer-links a:hover {
    color: var(--primary-red);
    padding-left: 8px;
}

.footer-newsletter p {
    color: var(--text-muted);
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.newsletter-form {
    display: flex;
    gap: 10px;
}

.newsletter-form input {
    flex: 1;
    padding: 12px 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-white);
    font-size: 0.95rem;
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--primary-red);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-bottom p {
    margin: 8px 0;
}

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

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

/* 首页 Banner */
.hero-banner {
    position: relative;
    height: 80vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-bottom: 60px;
    border-radius: 20px;
    border: 2px solid var(--primary-red);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.4;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    padding: 40px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--text-white) 0%, var(--primary-red) 50%, var(--accent-orange) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.4rem;
    color: var(--text-gray);
    margin-bottom: 30px;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeInUp 1s ease 0.4s both;
}

.btn {
    display: inline-block;
    padding: 16px 40px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all var(--transition-speed) ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
    box-shadow: 0 4px 20px var(--shadow-red);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px var(--shadow-red);
}

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

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

/* 卡片网格布局 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.card {
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-speed) ease;
    opacity: 0;
    transform: translateY(30px);
}

.card.show {
    opacity: 1;
    transform: translateY(0);
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-red);
    box-shadow: 0 10px 40px var(--shadow-red);
}

.card-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform var(--transition-speed) ease;
}

.card:hover .card-img {
    transform: scale(1.05);
}

.card-body {
    padding: 25px;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--primary-red);
}

.card-desc {
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.card-link {
    color: var(--primary-red);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.card-link:hover {
    color: var(--accent-orange);
}

/* 章节标题 */
.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-white);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-red), var(--accent-orange));
    border-radius: 2px;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-top: 20px;
}

/* 页脚 */
.site-footer {
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-black) 100%);
    border-top: 2px solid var(--primary-red);
    padding: 60px 40px 30px;
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto 40px;
}

.footer-section h3 {
    color: var(--primary-red);
    font-size: 1.2rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.footer-section p,
.footer-section a {
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 2;
}

.footer-section a:hover {
    color: var(--primary-red);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.animate-pulse {
    animation: pulse 2s infinite;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    }
    
    .intro-grid,
    .culture-grid,
    .honors-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    :root {
        --nav-width: 0;
    }
    
    .sidebar-nav,
    .vertical-nav {
        transform: translateX(100%);
    }
    
    .sidebar-nav.active,
    .vertical-nav.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-right: 0;
        padding: 80px 20px 40px;
    }
    
    .menu-toggle,
    .mobile-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        width: 100%;
        left: 0 !important;
        text-align: left !important;
        padding-left: 60px;
        padding-right: 20px;
    }
    
    .timeline-year {
        left: -20px !important;
        right: auto !important;
        width: 60px;
        height: 60px;
        font-size: 1.2rem;
    }
    
    .intro-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-banner {
        height: 60vh;
        min-height: 400px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-btns {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .footer-content,
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .intro-grid,
    .culture-grid,
    .honors-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .newsletter-form {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }
    
    .btn {
        padding: 12px 30px;
        font-size: 1rem;
    }
    
    .header-content h1 {
        font-size: 2rem;
    }
    
    .intro-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-item {
        padding: 15px 10px;
    }
    
    .stat-num {
        font-size: 2rem;
    }
}

/* ==================== 工具类 ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

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

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

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

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

.hidden {
    display: none;
}

/* 页面过渡动画 */
.page-transition {
    animation: pageFadeIn 0.5s ease;
}

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

/* ==================== 案例页面样式 ==================== */
.filter-section {
    padding: 40px 0;
    background: var(--bg-dark);
    border-bottom: 1px solid var(--border-color);
}

.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

.filter-btn {
    padding: 12px 30px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-gray);
    border-radius: 30px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-red);
    border-color: var(--primary-red);
    color: var(--text-white);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--shadow-red);
}

.cases-section {
    padding: 80px 0;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 40px;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    overflow: hidden;
    transition: all var(--transition-speed) ease;
    position: relative;
}

.case-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-red);
    box-shadow: 0 20px 50px rgba(255, 51, 51, 0.2);
}

.case-image {
    position: relative;
    overflow: hidden;
    height: 280px;
}

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

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

.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(10, 5, 5, 0) 0%, rgba(255, 51, 51, 0.9) 100%);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 30px;
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
}

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

.view-case-btn {
    padding: 12px 35px;
    background: var(--text-white);
    color: var(--primary-red);
    border-radius: 30px;
    font-weight: 600;
    font-size: 14px;
    transform: translateY(20px);
    transition: all var(--transition-speed) ease;
}

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

.view-case-btn:hover {
    background: var(--primary-dark);
    color: var(--text-white);
}

.case-info {
    padding: 25px;
}

.case-tag {
    display: inline-block;
    padding: 6px 15px;
    background: var(--primary-red);
    color: var(--text-white);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 15px;
}

.case-info h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-white);
    line-height: 1.4;
}

.case-desc {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
}

.case-meta {
    display: flex;
    gap: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.meta-item {
    color: var(--text-muted);
    font-size: 13px;
}

.case-results {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.result-item {
    text-align: center;
    padding: 15px;
    background: var(--bg-dark);
    border-radius: 10px;
}

.result-number {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-red);
    margin-bottom: 5px;
}

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

/* ==================== 客户评价页面样式 ==================== */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 30px;
    transition: all var(--transition-speed) ease;
    position: relative;
}

.testimonial-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-red);
    box-shadow: 0 15px 40px rgba(255, 51, 51, 0.15);
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 80px;
    color: var(--primary-red);
    opacity: 0.2;
    font-family: Georgia, serif;
    line-height: 1;
}

.testimonial-rating {
    display: flex;
    gap: 5px;
    margin-bottom: 15px;
}

.star {
    color: #ffcc00;
    font-size: 18px;
}

.testimonial-text {
    color: var(--text-gray);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 25px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.author-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary-red);
}

.author-info h4 {
    font-size: 16px;
    color: var(--text-white);
    margin-bottom: 5px;
}

.author-info p {
    font-size: 13px;
    color: var(--text-muted);
}

/* ==================== 团队页面样式 ==================== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 35px;
}

.team-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    overflow: hidden;
    text-align: center;
    transition: all var(--transition-speed) ease;
}

.team-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-red);
    box-shadow: 0 20px 50px rgba(255, 51, 51, 0.2);
}

.team-image {
    height: 320px;
    overflow: hidden;
}

.team-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.team-card:hover .team-image img {
    transform: scale(1.05);
}

.team-info {
    padding: 25px;
}

.team-info h3 {
    font-size: 20px;
    color: var(--text-white);
    margin-bottom: 8px;
}

.team-role {
    color: var(--primary-red);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 15px;
}

.team-desc {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
}

.team-social {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-gray);
    transition: all var(--transition-speed) ease;
}

.social-link:hover {
    background: var(--primary-red);
    border-color: var(--primary-red);
    color: var(--text-white);
    transform: translateY(-3px);
}

/* ==================== 咨询页面样式 ==================== */
.consulting-form {
    max-width: 700px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 40px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-white);
    font-weight: 500;
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-white);
    font-size: 15px;
    font-family: inherit;
    transition: all var(--transition-speed) ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-red);
    box-shadow: 0 0 15px rgba(255, 51, 51, 0.3);
}

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

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.form-submit {
    text-align: center;
    margin-top: 30px;
}

/* ==================== 报价页面样式 ==================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.pricing-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 15px;
    padding: 40px 30px;
    text-align: center;
    transition: all var(--transition-speed) ease;
    position: relative;
    overflow: hidden;
}

.pricing-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-red);
    box-shadow: 0 20px 50px rgba(255, 51, 51, 0.2);
}

.pricing-card.featured {
    border-color: var(--primary-red);
    box-shadow: 0 0 30px rgba(255, 51, 51, 0.3);
}

.pricing-card.featured::before {
    content: '热门推荐';
    position: absolute;
    top: 20px;
    right: -35px;
    background: var(--primary-red);
    color: var(--text-white);
    padding: 5px 40px;
    font-size: 12px;
    font-weight: 600;
    transform: rotate(45deg);
}

.pricing-header {
    margin-bottom: 30px;
}

.pricing-name {
    font-size: 22px;
    color: var(--text-white);
    margin-bottom: 15px;
}

.pricing-price {
    font-size: 42px;
    font-weight: 700;
    color: var(--primary-red);
    margin-bottom: 10px;
}

.pricing-price span {
    font-size: 16px;
    color: var(--text-muted);
    font-weight: 400;
}

.pricing-desc {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.6;
}

.pricing-features {
    text-align: left;
    margin: 30px 0;
    padding: 25px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.pricing-features li {
    padding: 12px 0;
    color: var(--text-gray);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.pricing-features li::before {
    content: '✓';
    color: var(--primary-red);
    font-weight: 700;
    font-size: 16px;
}

.pricing-card .btn {
    width: 100%;
    padding: 15px;
    font-size: 16px;
}

/* ==================== 关于我们页面样式 ==================== */
.about-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
    margin-bottom: 80px;
}

.about-image {
    border-radius: 15px;
    overflow: hidden;
    border: 2px solid var(--border-color);
}

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

.about-text h2 {
    font-size: 32px;
    margin-bottom: 25px;
    color: var(--text-white);
}

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

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin: 60px 0;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    transition: all var(--transition-speed) ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-red);
}

.stat-number {
    display: block;
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-red);
    margin-bottom: 10px;
}

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

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 100%;
    background: var(--primary-red);
}

.timeline-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    margin-bottom: 50px;
    position: relative;
}

.timeline-item:nth-child(odd) {
    direction: rtl;
}

.timeline-item:nth-child(odd) .timeline-content {
    text-align: right;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--primary-red);
    border-radius: 50%;
    border: 4px solid var(--bg-black);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-card);
    padding: 25px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
}

.timeline-year {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-red);
    margin-bottom: 10px;
}

.timeline-content h3 {
    font-size: 18px;
    color: var(--text-white);
    margin-bottom: 10px;
}

.timeline-content p {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.7;
}

.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 60px;
}

.culture-item {
    text-align: center;
    padding: 40px 30px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    transition: all var(--transition-speed) ease;
}

.culture-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-red);
}

.culture-icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.culture-item h3 {
    font-size: 20px;
    color: var(--text-white);
    margin-bottom: 15px;
}

.culture-item p {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.7;
}

.honors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 25px;
    margin-top: 50px;
}

.honor-item {
    text-align: center;
    padding: 25px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    transition: all var(--transition-speed) ease;
}

.honor-item:hover {
    border-color: var(--primary-red);
    transform: translateY(-3px);
}

.honor-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.honor-item h4 {
    font-size: 14px;
    color: var(--text-white);
    line-height: 1.5;
}

/* ==================== 联系我们页面样式 ==================== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 40px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 16px;
    color: var(--text-white);
    margin-bottom: 8px;
}

.contact-item p {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.7;
}

.map-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    overflow: hidden;
    height: 450px;
}

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

/* ==================== 响应式适配 ==================== */
@media (max-width: 1200px) {
    .cases-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .culture-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .about-intro {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item,
    .timeline-item:nth-child(odd) {
        grid-template-columns: 1fr;
        direction: ltr;
        padding-left: 80px;
    }
    
    .timeline-dot,
    .timeline-item:nth-child(odd) .timeline-dot {
        left: 30px;
        transform: translateX(-50%);
    }
    
    .timeline-content,
    .timeline-item:nth-child(odd) .timeline-content {
        text-align: left;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .culture-grid {
        grid-template-columns: 1fr;
    }
    
    .honors-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .filter-tabs {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-btn {
        text-align: center;
    }
}

@media (max-width: 576px) {
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .case-results {
        grid-template-columns: 1fr;
    }
    
    .honors-grid {
        grid-template-columns: 1fr;
    }
    
    .consulting-form,
    .contact-info-box {
        padding: 25px;
    }
    
    .pricing-card {
        padding: 30px 20px;
    }
    
    .pricing-price {
        font-size: 32px;
    }
}