/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a3a6c;
    --primary-light: #2a5298;
    --primary-dark: #0f2847;
    --accent-color: #e63946;
    --accent-light: #ff6b6b;
    --text-dark: #1a1a2e;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --bg-gray: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    transition: var(--transition);
}

.navbar.scrolled .logo-text {
    color: var(--primary-color);
}

.logo-sub {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.7);
    margin-left: 4px;
    transition: var(--transition);
}

.navbar.scrolled .logo-sub {
    color: var(--text-gray);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.9);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 6px;
    transition: var(--transition);
}

.navbar.scrolled .nav-link {
    color: var(--text-dark);
}

.nav-link:hover {
    color: #fff;
    background-color: rgba(255, 255, 255, 0.1);
}

.navbar.scrolled .nav-link:hover {
    color: var(--primary-color);
    background-color: var(--bg-gray);
}

.nav-contact {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    transition: var(--transition);
}

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

.phone-icon {
    font-size: 16px;
}

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

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

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

/* Hero首屏 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 70px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #051020 0%, #0a2547 30%, #0d3260 60%, #081c35 100%);
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 70% 20%, rgba(30, 80, 150, 0.4) 0%, transparent 50%),
        radial-gradient(ellipse at 30% 80%, rgba(180, 30, 30, 0.15) 0%, transparent 40%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M40 40c0-22.091 17.909-40 40-40-22.091 0-40 17.909-40 40zm0 0c0 22.091-17.909 40-40 40 0-22.091 17.909-40 40-40zm0 0c22.091 0 40 17.909 40 40-22.091 0-40-17.909-40-40zm0 0c0-22.091-17.909-40-40-40 0 22.091 17.909 40 40 40z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.6;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    width: 100%;
}

.hero-content {
    color: white;
    max-width: 700px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(220, 38, 38, 0.15);
    border: 1px solid rgba(220, 38, 38, 0.3);
    color: rgba(255, 255, 255, 0.9);
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 15px;
    margin-bottom: 30px;
    backdrop-filter: blur(10px);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #dc2626;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title-main {
    font-size: 56px;
    font-weight: 700;
    color: #fff;
    line-height: 1.1;
    margin: 0 0 10px 0;
    letter-spacing: 2px;
}

.hero-title-sub {
    font-size: 48px;
    font-weight: 700;
    color: #dc2626;
    line-height: 1.1;
    margin: 0 0 20px 0;
    letter-spacing: 2px;
}

.hero-slogan {
    font-size: 22px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 25px;
    font-weight: 500;
    letter-spacing: 1px;
}

.hero-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-features {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 15px;
}

.feature-icon-box {
    width: 48px;
    height: 48px;
    background: rgba(26, 58, 108, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

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

.feature-title {
    font-size: 17px;
    font-weight: 600;
    color: #fff;
}

.feature-desc {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 2px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

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

.btn-primary {
    background: #dc2626;
    color: white;
}

.btn-primary:hover {
    background: #b91c1c;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(220, 38, 38, 0.3);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-large {
    padding: 16px 40px;
    font-size: 18px;
}

.btn-full {
    width: 100%;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-product-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow-xl);
    position: relative;
    max-width: 320px;
}

.product-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-color);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.product-img-placeholder {
    width: 150px;
    height: 150px;
    margin: 20px auto;
    background: linear-gradient(135deg, var(--bg-gray), var(--bg-light));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-emoji {
    font-size: 60px;
}

.hero-product-card h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.hero-product-card p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 16px;
}

.product-price {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-color);
}

/* 通用区块样式 */
section {
    padding: 80px 0;
}

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

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-gray);
}

/* 产品优势 */
.advantages {
    background: var(--bg-light);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-card {
    background: white;
    padding: 30px 24px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

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

.advantage-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

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

/* 产品中心 */
.products {
    background: white;
}

.product-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--text-gray);
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.product-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.product-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.product-img {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--bg-gray), var(--bg-light));
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    position: relative;
    overflow: hidden;
}

.product-img .product-emoji {
    font-size: 32px;
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.logo-text-group {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.product-code {
    font-size: 10px;
    color: var(--text-gray);
    margin-top: 4px;
    font-weight: 500;
}

.product-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.product-desc {
    font-size: 13px;
    color: var(--text-gray);
    margin-bottom: 12px;
}

.product-price-range {
    font-size: 16px;
    font-weight: 700;
    color: var(--accent-color);
}

.product-detail {
    display: none;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.product-card.expanded .product-detail {
    display: block;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { opacity: 0; max-height: 0; }
    to { opacity: 1; max-height: 500px; }
}

.product-detail h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
    margin-top: 12px;
}

.product-detail h4:first-child {
    margin-top: 0;
}

.product-detail ul {
    list-style: none;
    margin-bottom: 8px;
}

.product-detail li {
    font-size: 13px;
    color: var(--text-gray);
    padding: 3px 0;
    padding-left: 16px;
    position: relative;
}

.product-detail li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.product-detail p {
    font-size: 13px;
    color: var(--text-gray);
}

.product-consult-btn {
    display: inline-block;
    margin-top: 16px;
    padding: 8px 20px;
    background: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
    text-align: center;
}

.product-consult-btn:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.product-pdd-btn {
    display: inline-block;
    margin-top: 10px;
    margin-left: 10px;
    padding: 8px 20px;
    background: #e02e24;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
    text-align: center;
}

.product-pdd-btn:hover {
    background: #c0241b;
    transform: translateY(-1px);
}

.product-toggle {
    text-align: center;
    font-size: 12px;
    color: var(--primary-color);
    margin-top: 12px;
    font-weight: 500;
}

.product-card.expanded .product-toggle {
    content: '收起 ▲';
}

/* 技术参数 */
.parameters {
    background: var(--bg-light);
}

.params-table-wrapper {
    overflow-x: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.params-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.params-table th {
    background: var(--primary-color);
    color: white;
    padding: 16px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
}

.params-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--text-dark);
}

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

.params-table tr:hover td {
    background: var(--bg-light);
}

.params-note {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-gray);
    font-style: italic;
}

/* 应用领域 */
.applications {
    background: white;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.app-card {
    background: var(--bg-light);
    padding: 30px 24px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

.app-card:hover {
    border-color: var(--primary-color);
    background: white;
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.app-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.app-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

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

/* 定制服务 */
.custom {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
}

.custom .section-title {
    color: white;
}

.custom .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.custom-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-bottom: 50px;
}

.custom-left h3,
.custom-right h3 {
    font-size: 22px;
    margin-bottom: 24px;
    font-weight: 600;
}

.custom-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.custom-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
}

.custom-check {
    width: 24px;
    height: 24px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}

.custom-steps {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.step-number {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.step-content p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}

.custom-advantages {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 50px;
}

.custom-adv-card {
    background: rgba(255, 255, 255, 0.1);
    padding: 24px;
    border-radius: 12px;
    text-align: center;
    backdrop-filter: blur(10px);
}

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

.custom-adv-card h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.custom-adv-card p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
}

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

/* 关于我们 */
.about {
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    margin-bottom: 50px;
    align-items: center;
}

.about-text h3 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.about-text p {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-item {
    background: white;
    padding: 30px 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

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

.about-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.about-feat {
    background: white;
    padding: 24px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.about-feat:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

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

.about-feat h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.about-feat p {
    font-size: 13px;
    color: var(--text-gray);
}

/* 联系我们 */
.contact {
    background: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.contact-info h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.contact-text h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.contact-text p {
    font-size: 15px;
    color: var(--text-gray);
}

.contact-hours {
    margin-top: 30px;
    padding: 20px;
    background: var(--bg-light);
    border-radius: 12px;
}

.contact-hours h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.contact-hours p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 4px;
}

.contact-form-wrapper {
    background: var(--bg-light);
    padding: 40px;
    border-radius: 16px;
}

.contact-form-wrapper h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-desc {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 30px;
}

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

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

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
}

.required {
    color: var(--accent-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-dark);
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 58, 108, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-success {
    text-align: center;
    padding: 40px 20px;
}

.success-icon {
    width: 60px;
    height: 60px;
    background: #10b981;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.form-success h4 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-success p {
    font-size: 14px;
    color: var(--text-gray);
}

/* 页脚 */
.footer {
    background: var(--primary-dark);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.footer-logo .logo-icon {
    font-size: 24px;
}

.footer-logo .logo-text {
    font-size: 20px;
    font-weight: 700;
    color: white;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: white;
}

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

.footer-col li {
    margin-bottom: 10px;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

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

.footer-contact li {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-bottom {
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

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

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

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 36px;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .app-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .custom-advantages {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-features {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 0;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        display: block;
        padding: 12px 16px;
    }
    
    .nav-contact {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-features {
        grid-template-columns: 1fr 1fr;
        justify-items: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image {
        order: -1;
    }
    
    section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .app-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .custom-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .custom-advantages {
        grid-template-columns: 1fr 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-features {
        grid-template-columns: 1fr 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 24px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-features {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .app-grid {
        grid-template-columns: 1fr;
    }
    
    .custom-advantages {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .contact-form-wrapper {
        padding: 24px;
    }
    
    .product-tabs {
        flex-direction: column;
        align-items: stretch;
    }
    
    .tab-btn {
        text-align: center;
    }
}