/* 海风易科技官网样式表 - 专业科技服务集团 */

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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #0ea5e9;
    --accent-color: #3b82f6;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --text-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Noto Sans SC', 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

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

/* 排版 */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

/* 按钮样式 */
.btn-primary, .btn-secondary, .btn-order, .btn-pricing, .btn-submit {
    display: inline-block;
    padding: 12px 32px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-order {
    background-color: #10b981;
    color: white;
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 0.9rem;
}

.btn-order:hover {
    background-color: #059669;
    transform: translateY(-2px);
}

.btn-pricing {
    background-color: var(--primary-color);
    color: var(--text-white);
    width: 100%;
    padding: 15px;
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
}

.btn-pricing:hover {
    background-color: var(--primary-dark);
}

.btn-submit {
    background-color: var(--primary-color);
    color: var(--text-white);
    width: 100%;
    padding: 15px;
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-submit:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
}

/* 启用状态 */
.btn-submit.enabled {
    background-color: var(--primary-color);
    cursor: pointer;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(37, 99, 235, 0); }
    100% { box-shadow: 0 0 0 0 rgba(37, 99, 235, 0); }
}

.btn-submit:disabled {
    background-color: var(--text-light);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 加载动画 */
.btn-submit.loading {
    color: transparent;
}

.btn-submit.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: button-spinner 0.8s linear infinite;
}

@keyframes button-spinner {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* 表单加载状态 */
.form-group.loading input,
.form-group.loading select,
.form-group.loading textarea {
    opacity: 0.7;
    cursor: not-allowed;
}

/* 成功/错误状态 */
.btn-submit.success {
    background-color: #10b981;
}

.btn-submit.error {
    background-color: #ef4444;
}

.btn-submit.success:disabled,
.btn-submit.error:disabled {
    background-color: inherit;
}

/* 验证按钮样式 */
.verification-container {
    display: flex;
    align-items: center;
    gap: 15px;
    margin: 10px 0;
}

.btn-verify {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 24px;
    background-color: #f3f4f6;
    border: 2px solid #d1d5db;
    border-radius: var(--radius-sm);
    color: #4b5563;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    text-align: center;
}

.btn-verify:hover {
    background-color: #e5e7eb;
    border-color: #9ca3af;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-verify:active {
    transform: translateY(0);
}

.btn-verify.verified {
    background-color: #10b981;
    border-color: #10b981;
    color: white;
}

.btn-verify.verified:hover {
    background-color: #0da271;
    border-color: #0da271;
}

.btn-verify:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-verify.loading {
    color: transparent;
    position: relative;
}

.btn-verify.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #4b5563;
    animation: spin 0.8s linear infinite;
}

.btn-verify.verified.loading::after {
    border-top-color: white;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.verify-status {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background-color: #10b981;
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 500;
    animation: fadeIn 0.5s ease;
}

.verify-status i {
    font-size: 1.2rem;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: 15px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    margin-right: 10px;
    font-size: 2rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-menu li a {
    font-weight: 500;
    color: var(--text-dark);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
}

.nav-menu li a:hover {
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
}

.nav-menu li a.active {
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
}

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

/* 英雄区域 */
.hero {
    padding: 150px 0 80px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4rem;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

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

.stat i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat h3 {
    font-size: 2rem;
    color: var(--primary-color);
    margin: 10px 0;
}

.hero-image {
    flex: 1;
}

.hero-image img {
    box-shadow: var(--shadow-lg);
    transform: perspective(1000px) rotateY(-10deg);
    transition: var(--transition);
}

.hero-image img:hover {
    transform: perspective(1000px) rotateY(0deg);
}

/* 关于我们 */
.about {
    padding: 100px 0;
    background-color: var(--bg-white);
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--text-dark);
}

.section-header h2 span {
    color: var(--primary-color);
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-light);
}

.about-content {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.about-text {
    flex: 1;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.about-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.feature {
    text-align: center;
    padding: 20px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
}

.feature i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature h4 {
    margin-bottom: 10px;
}

.about-image {
    flex: 1;
}

/* 旗下品牌介绍 */
.brands-section {
    padding: 60px 0;
    margin-top: 60px;
    border-top: 1px solid var(--border-color);
}

.brands-section .section-header {
    margin-bottom: 3rem;
    text-align: center;
}

.brands-section .section-header h3 {
    font-size: 2.5rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.brands-section .section-header h3 span {
    color: var(--primary-color);
    position: relative;
}

.brands-section .section-header h3 span::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
}

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

/* 字节跳动风格品牌网格 */
.brands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

/* 字节跳动风格品牌卡片 */
.brand-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    padding: 40px 35px;
    border-radius: 24px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid rgba(229, 231, 235, 0.8);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.brand-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 24px 24px 0 0;
}

.brand-card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 0 20px 60px rgba(37, 99, 235, 0.15);
    border-color: rgba(37, 99, 235, 0.3);
}

/* Logo样式 */
.brand-logo {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
    position: relative;
}

.brand-logo-img {
    width: 120px;
    height: 120px;
    object-fit: contain;
    border-radius: 20px;
    padding: 15px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(14, 165, 233, 0.05) 100%);
    box-shadow: 0 8px 32px rgba(37, 99, 235, 0.1);
    transition: all 0.4s ease;
}

.brand-card:hover .brand-logo-img {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 15px 40px rgba(37, 99, 235, 0.2);
}

.brand-logo-img.scdn {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(236, 72, 153, 0.05) 100%);
    box-shadow: 0 8px 32px rgba(139, 92, 246, 0.1);
}

/* 品牌内容 */
.brand-content {
    flex: 1;
    width: 100%;
}

.brand-card h4 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 15px;
    font-weight: 700;
    position: relative;
    display: inline-block;
}

.brand-card h4::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px;
}

/* 品牌标签 */
.brand-tag {
    display: inline-block;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.2);
}

/* 品牌描述 */
.brand-desc {
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 25px;
    text-align: justify;
}

/* 品牌特性标签 */
.brand-features {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 30px;
}

.brand-feature {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid rgba(37, 99, 235, 0.2);
    transition: all 0.3s ease;
}

.brand-card:hover .brand-feature {
    background: rgba(37, 99, 235, 0.15);
    transform: translateY(-2px);
}

/* 品牌链接 */
.brand-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    gap: 12px;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.25);
    width: auto;
    margin-top: auto;
}

.brand-link:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 15px 35px rgba(37, 99, 235, 0.35);
    color: white;
}

.brand-link i {
    font-size: 0.9rem;
    transition: transform 0.3s ease;
}

.brand-link:hover i {
    transform: translateX(8px);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .brands-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .brand-card {
        padding: 30px 25px;
    }
    
    .brand-logo-img {
        width: 100px;
        height: 100px;
    }
    
    .brand-card h4 {
        font-size: 1.6rem;
    }
    
    .brand-desc {
        font-size: 0.95rem;
    }
}

/* 产品服务 */
.services {
    padding: 100px 0;
    background-color: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.service-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    padding: 35px 30px;
    border-radius: 20px;
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.05);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid rgba(229, 231, 235, 0.8);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 20px 20px 0 0;
}

.service-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 20px 50px rgba(37, 99, 235, 0.15);
    border-color: rgba(37, 99, 235, 0.3);
}

.service-icon {
    font-size: 3.5rem;
    color: var(--primary-color);
    margin-bottom: 25px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(14, 165, 233, 0.05) 100%);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.1);
    transition: all 0.4s ease;
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(10deg);
    box-shadow: 0 15px 35px rgba(37, 99, 235, 0.2);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.15) 0%, rgba(14, 165, 233, 0.1) 100%);
}

.service-card h3 {
    margin-bottom: 15px;
    color: var(--text-dark);
    font-size: 1.5rem;
    font-weight: 700;
    position: relative;
    display: inline-block;
}

.service-card h3::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px;
}

.service-card p {
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 20px;
    font-size: 1rem;
}

.service-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    gap: 10px;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.2);
    margin-top: 20px;
}

.service-link:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 15px 30px rgba(37, 99, 235, 0.3);
    color: white;
}

.service-link i {
    font-size: 0.9rem;
    transition: transform 0.3s ease;
}

.service-link:hover i {
    transform: translateX(8px);
}

/* 服务地区 */
.regions {
    padding: 100px 0;
    background-color: var(--bg-white);
}

.regions-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    margin-bottom: 3rem;
}

.region-section h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.region-section h3 i {
    color: var(--primary-color);
}

.region-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.region-tag {
    background: var(--bg-light);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--text-dark);
    border: 1px solid var(--border-color);
}

.region-map {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: var(--radius-md);
    padding: 60px;
    text-align: center;
}

.map-placeholder i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.map-placeholder p {
    font-size: 1.2rem;
    color: var(--text-light);
}

/* 价格方案 */
.pricing {
    padding: 100px 0;
    background-color: var(--bg-light);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.pricing-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    position: relative;
    transition: var(--transition);
}

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

.pricing-card.featured {
    border: 2px solid var(--primary-color);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 6px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.pricing-header h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
}

.price {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 10px 0;
}

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

.pricing-features {
    margin-bottom: 2rem;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.pricing-features li i {
    color: #10b981;
}

.pricing-note {
    background: var(--bg-white);
    padding: 20px;
    border-radius: var(--radius-md);
    text-align: center;
    border-left: 4px solid var(--primary-color);
}

.pricing-note i {
    color: var(--primary-color);
    margin-right: 10px;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background-color: var(--bg-white);
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4rem;
    background: var(--bg-light);
    padding: 50px;
    border-radius: var(--radius-md);
}

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

.contact-item i {
    font-size: 2rem;
    color: var(--primary-color);
}

.contact-item h4 {
    margin-bottom: 5px;
    color: var(--text-dark);
}

.contact-form h3 {
    margin-bottom: 2rem;
    color: var(--text-dark);
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.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(37, 99, 235, 0.1);
}

/* 页脚 */
.footer {
    background-color: #1f2937;
    color: white;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
    margin: 20px 0;
}

.social-links {
    display: flex;
    gap: 15px;
}

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

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

.footer-links h4,
.footer-contact h4 {
    color: white;
    margin-bottom: 20px;
}

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

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.7);
}

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

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 15px;
}

.footer-contact i {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: var(--transition);
    z-index: 100;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 992px) {
    h1 {
        font-size: 2.8rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .brands-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .regions-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .brands-grid {
        grid-template-columns: 1fr;
    }
    
    .regions-content {
        grid-template-columns: 1fr;
    }
    
    .pricing-cards {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .footer-contact p {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2.2rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
    }
}

/* 数学验证样式 */
.math-verification {
    margin: 15px 0;
    padding: 20px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: var(--radius-sm);
}

.math-problem {
    font-size: 1.8rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    padding: 15px;
    background: white;
    border: 2px dashed #cbd5e1;
    border-radius: var(--radius-sm);
    color: #1e293b;
}

.math-problem span {
    margin: 0 5px;
}

.math-input-container {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

#mathAnswer {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #d1d5db;
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
    text-align: center;
    transition: all 0.3s ease;
}

#mathAnswer:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn-check-math {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn-check-math:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-check-math:disabled {
    background-color: #9ca3af;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.math-status {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background-color: #10b981;
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 500;
    animation: fadeIn 0.5s ease;
}

.math-status i {
    font-size: 1.2rem;
}

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

.math-verified .math-problem {
    background-color: #d1fae5;
    border-color: #10b981;
    animation: mathSuccess 0.5s ease;
}