/* ===== 基础重置与变量 ===== */
:root {
    --primary: #0066CC;
    --primary-dark: #0052a3;
    --primary-light: #e6f0ff;
    --accent: #FF6B35;
    --accent-light: #fff0eb;
    --text: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-light: #7a7a9a;
    --bg: #ffffff;
    --bg-light: #f8fafc;
    --bg-dark: #0f172a;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    line-height: 1.6;
    background: var(--bg);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

ul {
    list-style: none;
}

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

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    gap: 8px;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 102, 204, 0.3);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.8);
}

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

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

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

.btn-full {
    width: 100%;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

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

.logo-icon svg {
    display: block;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-text .brand {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.logo-text .slogan {
    font-size: 12px;
    color: var(--text-light);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-menu a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

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

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
}

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1e293b 100%);
    overflow: hidden;
    padding-top: 72px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0, 102, 204, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 107, 53, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(0, 102, 204, 0.1) 0%, transparent 50%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 56px;
    font-weight: 800;
    color: white;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero-content h1 .highlight {
    color: var(--accent);
    position: relative;
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-product-showcase {
    position: relative;
    height: 400px;
}

.product-float {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius);
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: white;
    font-weight: 600;
    animation: float 6s ease-in-out infinite;
}

.product-icon {
    font-size: 28px;
}

.product-1 { top: 10%; left: 10%; animation-delay: 0s; }
.product-2 { top: 5%; right: 15%; animation-delay: 1s; }
.product-3 { top: 40%; left: 5%; animation-delay: 2s; }
.product-4 { top: 35%; right: 5%; animation-delay: 3s; }
.product-5 { bottom: 15%; left: 25%; animation-delay: 4s; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid rgba(255, 255, 255, 0.5);
    border-bottom: 2px solid rgba(255, 255, 255, 0.5);
    transform: rotate(45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: rotate(45deg) translate(0, 0); }
    50% { transform: rotate(45deg) translate(5px, 5px); }
}

/* ===== 通用区块标题 ===== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header.light {
    color: white;
}

.section-header.light .section-desc {
    color: rgba(255, 255, 255, 0.7);
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--primary);
    margin-bottom: 12px;
    text-transform: uppercase;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

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

/* ===== 产品区块 ===== */
.products-section {
    padding: 100px 0;
    background: var(--bg);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.product-card {
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border);
}

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

.product-img {
    height: 200px;
    overflow: hidden;
}

.product-placeholder {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
}

.product-placeholder.blue { background: linear-gradient(135deg, #e6f0ff, #cce0ff); }
.product-placeholder.red { background: linear-gradient(135deg, #ffe6e6, #ffcccc); }
.product-placeholder.cyan { background: linear-gradient(135deg, #e6fffe, #ccfffd); }
.product-placeholder.orange { background: linear-gradient(135deg, #fff0eb, #ffe0d6); }
.product-placeholder.green { background: linear-gradient(135deg, #e6ffe6, #ccffcc); }

.product-info {
    padding: 24px;
}

.product-info h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.product-info p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.link-arrow {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

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

/* ===== 特色优势 ===== */
.features-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.features-section .section-tag {
    color: rgba(255, 255, 255, 0.8);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.feature-item {
    text-align: center;
    padding: 32px 24px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
}

.feature-icon {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
}

.feature-item h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-item p {
    font-size: 15px;
    opacity: 0.9;
    line-height: 1.6;
}

/* ===== 数据统计 ===== */
.stats-section {
    padding: 80px 0;
    background: var(--bg-light);
}

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

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 56px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.stat-suffix {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent);
    margin-top: 4px;
}

.stat-label {
    font-size: 16px;
    color: var(--text-secondary);
    margin-top: 12px;
    font-weight: 500;
}

/* ===== CTA 区块 ===== */
.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--accent) 0%, #e55a2b 100%);
    text-align: center;
    color: white;
}

.cta-section h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 32px;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand .logo-text .brand {
    color: white;
}

.footer-brand .logo-text .slogan {
    color: rgba(255, 255, 255, 0.5);
}

.footer-brand p {
    margin-top: 20px;
    line-height: 1.8;
    font-size: 14px;
}

.footer-links h4,
.footer-contact h4 {
    color: white;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 24px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    transition: var(--transition);
}

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

.footer-contact p {
    font-size: 14px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
}

/* ===== 页面通用标题 ===== */
.page-header {
    padding: 160px 0 80px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    text-align: center;
    color: white;
}

.page-header h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
}

.page-header p {
    font-size: 20px;
    opacity: 0.9;
}

/* ===== 产品详情页 ===== */
.product-nav {
    background: white;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 72px;
    z-index: 100;
}

.product-nav-list {
    display: flex;
    gap: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.product-nav .nav-item {
    padding: 16px 24px;
    font-weight: 600;
    font-size: 15px;
    color: var(--text-secondary);
    border-bottom: 3px solid transparent;
    white-space: nowrap;
    transition: var(--transition);
}

.product-nav .nav-item:hover,
.product-nav .nav-item.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.product-detail {
    padding: 80px 0;
}

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

.product-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.product-layout.reverse {
    direction: rtl;
}

.product-layout.reverse > * {
    direction: ltr;
}

.product-visual {
    display: flex;
    justify-content: center;
}

.product-showcase {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-showcase.blue { background: linear-gradient(135deg, #e6f0ff, #99c2ff); }
.product-showcase.red { background: linear-gradient(135deg, #ffe6e6, #ff9999); }
.product-showcase.cyan { background: linear-gradient(135deg, #e6fffe, #99fffc); }
.product-showcase.orange { background: linear-gradient(135deg, #fff0eb, #ffc2ad); }
.product-showcase.green { background: linear-gradient(135deg, #e6ffe6, #99ff99); }

.showcase-icon {
    font-size: 100px;
    margin-bottom: 20px;
}

.showcase-label {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 3px;
}

.product-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--accent-light);
    color: var(--accent);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 16px;
}

.product-content h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
}

.product-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
}

.product-specs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 32px;
}

.spec-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.spec-label {
    color: var(--text-light);
}

.spec-value {
    font-weight: 600;
    color: var(--text);
}

.product-features h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
}

.product-features ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.product-features li {
    font-size: 15px;
    color: var(--text-secondary);
}

/* ===== 关于我们页 ===== */
.about-intro {
    padding: 80px 0;
}

.about-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-content .section-tag {
    margin-bottom: 16px;
}

.about-content h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 24px;
}

.about-content .lead {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-content p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-mission {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.mission-item {
    text-align: center;
    padding: 24px;
    background: var(--bg-light);
    border-radius: var(--radius);
}

.mission-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.mission-item h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
}

.mission-item p {
    font-size: 13px;
    color: var(--text-light);
    margin: 0;
}

.about-visual {
    display: flex;
    justify-content: center;
}

.about-image {
    width: 100%;
    max-width: 500px;
}

.about-placeholder {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, var(--primary-light), #b3d7ff);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 80px;
}

.about-placeholder p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-top: 16px;
}

/* 时间线 */
.timeline-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--border);
}

.timeline-item {
    display: flex;
    justify-content: flex-end;
    padding-right: 50%;
    position: relative;
    margin-bottom: 40px;
}

.timeline-item:nth-child(even) {
    justify-content: flex-start;
    padding-right: 0;
    padding-left: 50%;
}

.timeline-year {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 60px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    z-index: 1;
}

.timeline-content {
    width: 45%;
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.timeline-content h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary);
}

.timeline-content p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 认证 */
.certifications-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1e293b 100%);
}

.certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.cert-item {
    text-align: center;
    padding: 32px 24px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.cert-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.cert-badge {
    font-size: 40px;
    margin-bottom: 16px;
}

.cert-item h4 {
    color: white;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.cert-item p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

/* 生产能力 */
.capability-section {
    padding: 80px 0;
}

.capability-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.capability-card {
    padding: 32px;
    background: white;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    text-align: center;
    transition: var(--transition);
}

.capability-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.capability-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.capability-card h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
}

.capability-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== 联系页 ===== */
.contact-section {
    padding: 60px 0;
    background: var(--bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.contact-info-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.contact-info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.contact-info-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
}

.contact-info-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 表单 */
.contact-form-section {
    padding: 80px 0;
}

.form-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.form-info h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
}

.form-info > p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
}

.form-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
}

.feature-check {
    width: 24px;
    height: 24px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
}

.form-container {
    background: white;
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition);
    background: white;
}

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

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

.form-note {
    font-size: 13px;
    color: var(--text-light);
    text-align: center;
    margin-top: 8px;
}

/* 合作模式 */
.cooperation-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.coop-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.coop-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.coop-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.coop-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.coop-card h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
}

.coop-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 42px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-product-showcase {
        display: none;
    }

    .about-layout,
    .form-layout {
        grid-template-columns: 1fr;
    }

    .product-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .product-layout.reverse {
        direction: ltr;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 0;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-menu a {
        padding: 16px 0;
        border-bottom: 1px solid var(--border);
    }

    .hamburger {
        display: flex;
    }

    .hero-content h1 {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

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

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

    .stat-number {
        font-size: 40px;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        padding-left: 60px;
        padding-right: 0;
        justify-content: flex-start;
    }

    .timeline-year {
        left: 20px;
        transform: translateX(-50%);
    }

    .timeline-content {
        width: 100%;
    }

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

    .product-specs {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .page-header h1 {
        font-size: 36px;
    }
}

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

    .hero-content h1 {
        font-size: 28px;
    }

    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }

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

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

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

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

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

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

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