/* ===================================
   全局样式 - 企业官网
   风格: 大气、国际化、简约
   =================================== */

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

:root {
    /* 主色调 */
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    
    /* 中性色 */
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-overlay: linear-gradient(135deg, rgba(44, 62, 80, 0.85), rgba(52, 152, 219, 0.85));
    
    /* 字体 */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.15);
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-brand .brand-logo {
    height: 45px;
    width: auto;
    object-fit: contain;
}

.nav-brand .logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: width var(--transition-normal);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: all var(--transition-fast);
}

/* 语言切换器 */
.lang-switcher {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.4rem 0.8rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-dark);
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

.lang-icon {
    font-size: 1.1rem;
}

.lang-text {
    font-weight: 500;
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-shadow: var(--shadow-md);
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 100;
}

.lang-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    padding: 0.6rem 1rem;
    color: var(--text-dark);
    text-decoration: none;
    transition: background var(--transition-fast);
}

.lang-option:hover {
    background: var(--bg-light);
}

.lang-option.active {
    background: var(--bg-light);
    color: var(--secondary-color);
    font-weight: 500;
}

/* 英雄区 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-image: url('../images/hero-background.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    overflow: hidden;
}

.hero::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 1440 320"><path fill="rgba(255,255,255,0.1)" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,138.7C960,139,1056,117,1152,96C1248,75,1344,53,1392,42.7L1440,32L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
}

.hero-content {
    position: relative;
    text-align: center;
    color: white;
    z-index: 1;
    max-width: 900px;
    padding: var(--spacing-md);
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background: transparent;
    border-color: white;
    color: white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-3px);
}

.btn-block {
    display: block;
    width: 100%;
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 2px;
    animation: scroll-down 2s infinite;
}

@keyframes scroll-down {
    0%, 100% {
        opacity: 0;
        top: 8px;
    }
    50% {
        opacity: 1;
        top: 16px;
    }
}

/* 区块通用样式 */
.section {
    padding: var(--spacing-xl) 0;
}

.section:nth-child(even) {
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.section-divider {
    width: 60px;
    height: 4px;
    background: var(--secondary-color);
    margin: 0 auto var(--spacing-sm);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* 关于我们 */
.about-content {
    display: block;
    max-width: 100%;
}

.about-image {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    height: 500px;
}

.about-image > img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.about-image-overlay {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 200px;
    height: 280px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    border: 4px solid white;
    transition: transform var(--transition-normal);
}

.about-image-overlay:hover {
    transform: scale(1.05);
}

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

.about-text h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.about-text p {
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
    font-size: 1.05rem;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

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

.feature-icon {
    width: 50px;
    height: 50px;
    background: var(--secondary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto var(--spacing-xs);
    font-weight: bold;
}

.feature-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
    color: var(--primary-color);
}

.feature-item p {
    font-size: 0.9rem;
    color: var(--text-light);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.stat-item {
    background: white;
    padding: var(--spacing-md);
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-light);
}

/* 服务项目 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.service-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

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

.service-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.service-card h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.service-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* 案例展示 */
.portfolio-filter {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-dark);
    transition: all var(--transition-fast);
}

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

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
}

.portfolio-item {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.portfolio-item.hidden {
    display: none;
}

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

.portfolio-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
    position: relative;
    background: var(--bg-light);
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.placeholder-image {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
    padding: var(--spacing-md);
}

.portfolio-info {
    padding: var(--spacing-md);
}

.portfolio-info h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.portfolio-info p {
    color: var(--text-light);
}

/* 联系我们 */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-lg);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.info-item {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
}

.info-icon {
    font-size: 2rem;
    color: var(--secondary-color);
    flex-shrink: 0;
}

.info-text h4 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.info-text p {
    color: var(--text-light);
    line-height: 1.6;
    white-space: pre-line;
}

.contact-form {
    background: white;
    padding: var(--spacing-md);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

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

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

.form-message {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    display: none;
}

.form-message.success {
    background: #d4edda;
    color: #155724;
    display: block;
}

.form-message.error {
    background: #f8d7da;
    color: #721c24;
    display: block;
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

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

.footer-col h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: white;
}

.footer-col p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

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

.footer-links li {
    margin-bottom: 0.5rem;
}

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

.footer-links a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.social-link {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

/* 动画效果 */
.animate-fade-in {
    animation: fadeIn 1s ease-out;
}

.animate-fade-in-delay {
    animation: fadeIn 1s ease-out 0.3s both;
}

.animate-fade-in-delay-2 {
    animation: fadeIn 1s ease-out 0.6s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   移动端优化
   =================================== */

/* 触摸优化 - 增大点击区域 */
@media (hover: none) and (pointer: coarse) {
    .btn,
    .nav-link,
    .filter-btn,
    .lang-btn {
        min-height: 44px;
        min-width: 44px;
    }
}

/* 平滑滚动和触摸 */
html {
    -webkit-overflow-scrolling: touch;
}

/* 防止文本选择干扰滑动 */
.hero,
.navbar,
.footer {
    -webkit-user-select: none;
    user-select: none;
}

/* 点击高亮优化 */
* {
    -webkit-tap-highlight-color: rgba(52, 152, 219, 0.2);
}

/* 表单输入优化 */
input,
textarea,
select {
    font-size: 16px;
}

/* 图片优化 */
img {
    -webkit-touch-callout: none;
}

/* ===================================
   响应式设计
   =================================== */
@media (max-width: 968px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        font-size: 14px;
    }
    
    .nav-brand .brand-logo {
        height: 35px;
    }
    
    .nav-brand .logo {
        font-size: 1.4rem;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: white;
        width: 100%;
        text-align: center;
        transition: left var(--transition-normal);
        box-shadow: var(--shadow-md);
        padding: var(--spacing-md) 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    
    
    .about-image {
        height: 280px;
    }
    
    .about-image-overlay {
        width: 120px;
        height: 168px;
        bottom: 10px;
        right: 10px;
        border-width: 3px;
    }
    
    .portfolio-image {
        height: 200px;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
}