/* ========== 全局重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.8;
    color: #333;
    background-color: #fff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul, ol {
    list-style: none;
}

/* ========== 配色变量 ========== */
:root {
    --primary-color: #e74c3c;
    --primary-dark: #c0392b;
    --secondary-color: #f39c12;
    --accent-color: #9b59b6;
    --success-color: #27ae60;
    --text-dark: #2c3e50;
    --text-gray: #7f8c8d;
    --bg-light: #f9f9f9;
    --bg-white: #ffffff;
    --border-color: #ecf0f1;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== 容器 ========== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== 导航栏 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-brand .brand-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.2rem;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-menu a {
    padding: 10px 20px;
    color: var(--text-dark);
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
    background: rgba(231, 76, 60, 0.08);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    font-size: 1.5rem;
    color: var(--text-dark);
}

/* ========== Hero区域 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    overflow: hidden;
    padding-top: 70px;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('https://picsum.photos/seed/hero-bg/1920/1080') center/cover;
    opacity: 0.3;
}

.hero::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: #fff;
    max-width: 900px;
    padding: 0 20px;
    animation: fadeInUp 1s ease-out;
}

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

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 50px;
    font-size: 0.9rem;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
    animation: fadeIn 1.5s ease-out;
}

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

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 24px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
    animation: fadeInUp 1.2s ease-out;
}

.hero h1 .highlight {
    background: linear-gradient(90deg, #ffd700, #ffaa00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: 40px;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1.4s ease-out;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1.6s ease-out;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff;
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.5);
}

.btn-secondary {
    background: rgba(255,255,255,0.2);
    color: #fff;
    border: 2px solid rgba(255,255,255,0.5);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-3px);
}

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

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

/* ========== 通用 Section ========== */
.section {
    padding: 80px 0;
}

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

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

.section-header h2 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-gray);
    max-width: 600px;
    margin: 24px auto 0;
}

/* ========== 特性卡片 ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #fff;
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    text-align: center;
    border: 1px solid var(--border-color);
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, rgba(231,76,60,0.1), rgba(243,156,18,0.1));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transform: rotateY(180deg);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

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

/* ========== 服务区域 ========== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: #fff;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.service-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
}

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

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

.service-content {
    padding: 28px;
}

.service-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.service-content p {
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 16px;
}

.service-link {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.service-link:hover {
    gap: 8px;
}

/* ========== 详细内容区 ========== */
.detail-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.detail-section.reverse {
    direction: rtl;
}

.detail-section.reverse > * {
    direction: ltr;
}

.detail-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

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

.detail-content h2 {
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
    line-height: 1.4;
}

.detail-content p {
    color: var(--text-gray);
    font-size: 1rem;
    margin-bottom: 20px;
    line-height: 1.8;
}

.detail-list {
    margin: 24px 0;
}

.detail-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 0;
    color: var(--text-dark);
}

.detail-list li::before {
    content: '✓';
    width: 24px;
    height: 24px;
    background: var(--success-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}

/* ========== CTA区域 ========== */
.cta {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('https://picsum.photos/seed/cta-bg/1920/600') center/cover;
    opacity: 0.15;
}

.cta-content {
    position: relative;
    z-index: 2;
}

.cta h2 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 16px;
}

.cta p {
    font-size: 1.1rem;
    margin-bottom: 36px;
    opacity: 0.95;
}

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

.cta .btn-primary:hover {
    background: rgba(255,255,255,0.9);
}

/* ========== FAQ区域 ========== */
.faq-grid {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #fff;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.faq-question {
    padding: 20px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text-dark);
    transition: var(--transition);
}

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

.faq-question .arrow {
    transition: transform 0.3s ease;
    font-size: 0.8rem;
}

.faq-item.active .faq-question .arrow {
    transform: rotate(180deg);
}

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

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-inner {
    padding: 0 24px 20px;
    color: var(--text-gray);
    line-height: 1.8;
}

/* ========== 统计数据 ========== */
.stats {
    background: linear-gradient(135deg, #2c3e50, #34495e);
    color: #fff;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    text-align: center;
}

.stat-item h3 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--secondary-color);
    margin-bottom: 8px;
}

.stat-item p {
    font-size: 1rem;
    opacity: 0.9;
}

/* ========== 页脚 ========== */
.footer {
    background: #1a1a2e;
    color: #a0a0a0;
    padding: 60px 0 0;
}

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

.footer-brand {
    margin-bottom: 20px;
}

.footer-brand .nav-brand {
    color: #fff;
    margin-bottom: 16px;
}

.footer p {
    font-size: 0.9rem;
    line-height: 1.8;
    margin-bottom: 16px;
}

.footer h4 {
    color: #fff;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

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

.footer-links a {
    color: #a0a0a0;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 1rem;
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 24px 0;
    text-align: center;
    font-size: 0.85rem;
}

/* ========== 页面Banner ========== */
.page-banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 140px 0 80px;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('https://picsum.photos/seed/page-banner/1920/400') center/cover;
    opacity: 0.2;
}

.page-banner .container {
    position: relative;
    z-index: 2;
}

.page-banner h1 {
    font-size: clamp(1.75rem, 3.5vw, 2.75rem);
    font-weight: 700;
    margin-bottom: 12px;
}

.page-banner p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 0.9rem;
    opacity: 0.9;
}

.breadcrumb a {
    color: #fff;
    opacity: 0.8;
}

.breadcrumb a:hover {
    opacity: 1;
}

.breadcrumb .separator {
    opacity: 0.6;
}

/* ========== 关于页面 ========== */
.about-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.about-content h2 {
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.mission-vision {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 40px;
}

.mv-card {
    padding: 30px;
    background: #fff;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.mv-card h3 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 12px;
}

/* ========== 产品/新闻列表页 ========== */
.grid-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.card-item {
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.card-thumb {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

.card-item:hover .card-thumb img {
    transform: scale(1.08);
}

.card-body {
    padding: 24px;
}

.card-meta {
    display: flex;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--text-gray);
    margin-bottom: 12px;
}

.card-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.card-body h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
    line-height: 1.5;
    transition: var(--transition);
}

.card-item:hover .card-body h3 {
    color: var(--primary-color);
}

.card-body p {
    font-size: 0.9rem;
    color: var(--text-gray);
    line-height: 1.7;
}

/* ========== 详情页 ========== */
.detail-article {
    max-width: 800px;
    margin: 0 auto;
}

.article-header {
    text-align: center;
    margin-bottom: 40px;
}

.article-header h1 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    line-height: 1.4;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 24px;
    color: var(--text-gray);
    font-size: 0.9rem;
}

.article-content {
    font-size: 1.05rem;
    line-height: 2;
    color: #444;
}

.article-content h2 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin: 36px 0 16px;
    padding-left: 16px;
    border-left: 4px solid var(--primary-color);
}

.article-content h3 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin: 28px 0 12px;
}

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

.article-content img {
    border-radius: var(--radius-md);
    margin: 24px 0;
    box-shadow: var(--shadow-md);
}

.article-content ul,
.article-content ol {
    margin: 16px 0 20px;
    padding-left: 24px;
}

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

/* ========== 联系页面 ========== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    padding: 40px;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.contact-info h2 {
    font-size: 1.75rem;
    color: var(--text-dark);
    margin-bottom: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 1rem;
    color: var(--text-dark);
    margin-bottom: 4px;
}

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

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

.contact-form h2 {
    font-size: 1.75rem;
    color: var(--text-dark);
    margin-bottom: 24px;
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-family: inherit;
    background: var(--bg-light);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(231,76,60,0.1);
}

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

/* ========== 分页 ========== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 50px;
}

.pagination a {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: #fff;
    border: 1px solid var(--border-color);
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
}

.pagination a:hover,
.pagination a.active {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ========== 动画类 ========== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 移动端适配 ========== */
@media (max-width: 1024px) {
    .detail-section,
    .about-hero,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .detail-section.reverse {
        direction: ltr;
    }

    .mission-vision {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        box-shadow: var(--shadow-md);
        transform: translateY(-150%);
        transition: transform 0.3s ease;
    }

    .nav-menu.open {
        transform: translateY(0);
    }

    .nav-menu a {
        display: block;
        padding: 14px 20px;
    }

    .nav-toggle {
        display: block;
    }

    .hero {
        min-height: auto;
        padding: 120px 0 80px;
    }

    .section {
        padding: 60px 0;
    }

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

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

    .contact-info,
    .contact-form {
        padding: 30px 24px;
    }

    .cta {
        padding: 60px 0;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

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

    .section-header {
        margin-bottom: 40px;
    }

    .feature-card,
    .service-content {
        padding: 24px 20px;
    }
}

/* ========== 打印样式 ========== */
@media print {
    .header, .footer, .hero-buttons, .back-to-top, .nav-toggle {
        display: none;
    }

    body {
        color: #000;
    }
}