/* ========== 基础重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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: #333;
    background-color: #fff;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

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

.center {
    text-align: center;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #0099cc, #006699);
    color: #fff;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #00aadd, #0077aa);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 153, 204, 0.3);
}

.btn-outline {
    border: 2px solid #0099cc;
    color: #0099cc;
    background: transparent;
}

.btn-outline:hover {
    background: #0099cc;
    color: #fff;
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

/* ========== 导航栏 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

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

.logo h1 {
    font-size: 24px;
    color: #0099cc;
}

.nav ul {
    display: flex;
    gap: 35px;
}

.nav ul li a {
    font-size: 16px;
    color: #555;
    transition: color 0.3s;
    padding: 5px 0;
    position: relative;
}

.nav ul li a:hover,
.nav ul li a.active {
    color: #0099cc;
}

.nav ul li a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: #0099cc;
    border-radius: 1px;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background: #333;
    border-radius: 2px;
    transition: 0.3s;
}

/* ========== Banner ========== */
.banner {
    margin-top: 70px;
    height: 500px;
    background: linear-gradient(135deg, #0099cc 0%, #006699 50%, #004466 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.banner::before {
    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: float 6s ease-in-out infinite;
}

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

.banner-content {
    position: relative;
    z-index: 1;
}

.banner-content h2 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
}

.banner-content p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* ========== 页面Banner ========== */
.page-banner {
    margin-top: 70px;
    padding: 80px 20px;
    background: linear-gradient(135deg, #0099cc, #006699);
    text-align: center;
    color: #fff;
}

.page-banner h2 {
    font-size: 36px;
    margin-bottom: 10px;
}

.page-banner p {
    font-size: 18px;
    opacity: 0.9;
}

/* ========== 章节标题 ========== */
.section-title {
    text-align: center;
    font-size: 32px;
    color: #333;
    margin-bottom: 50px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: #0099cc;
    margin: 15px auto 0;
    border-radius: 2px;
}

/* ========== 首页亮点 ========== */
.highlights {
    padding: 80px 0;
    background: #f8f9fa;
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.highlight-item {
    text-align: center;
    padding: 40px 20px;
    background: #fff;
    border-radius: 10px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.highlight-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.highlight-item .icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.highlight-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #333;
}

.highlight-item p {
    color: #666;
    font-size: 14px;
}

/* ========== 服务预览 ========== */
.services-preview {
    padding: 80px 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.service-card {
    text-align: center;
    padding: 40px 20px;
    border: 1px solid #eee;
    border-radius: 10px;
    transition: all 0.3s;
}

.service-card:hover {
    border-color: #0099cc;
    box-shadow: 0 5px 20px rgba(0, 153, 204, 0.15);
    transform: translateY(-3px);
}

.service-card .service-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.service-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #333;
}

.service-card p {
    color: #666;
    font-size: 14px;
}

/* ========== 统计数据 ========== */
.stats {
    padding: 60px 0;
    background: linear-gradient(135deg, #0099cc, #006699);
    color: #fff;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item .stat-number {
    display: block;
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-item .stat-label {
    font-size: 16px;
    opacity: 0.9;
}

/* ========== 服务详情页 ========== */
.services-section {
    padding: 60px 0;
}

.service-category {
    margin-bottom: 60px;
}

.service-card-detail {
    padding: 30px;
    border: 1px solid #eee;
    border-radius: 10px;
    transition: all 0.3s;
    text-align: center;
}

.service-card-detail:hover {
    border-color: #0099cc;
    box-shadow: 0 5px 20px rgba(0, 153, 204, 0.15);
    transform: translateY(-3px);
}

.service-card-detail .service-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.service-card-detail h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #333;
}

.service-card-detail p {
    color: #666;
    font-size: 14px;
    margin-bottom: 15px;
    line-height: 1.8;
}

.service-card-detail .price {
    display: inline-block;
    background: #f0f9ff;
    color: #0099cc;
    padding: 5px 15px;
    border-radius: 15px;
    font-weight: 600;
    font-size: 14px;
}

/* ========== 服务流程 ========== */
.process {
    padding: 80px 0;
    background: #f8f9fa;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #0099cc, #006699);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    margin: 0 auto 15px;
}

.step h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: #333;
}

.step p {
    color: #666;
    font-size: 14px;
}

/* ========== 合作页面 ========== */
.cooperation-section {
    padding: 80px 0;
}

.cooperation-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.coop-card {
    padding: 40px 30px;
    border: 1px solid #eee;
    border-radius: 10px;
    transition: all 0.3s;
}

.coop-card:hover {
    border-color: #0099cc;
    box-shadow: 0 10px 30px rgba(0, 153, 204, 0.1);
    transform: translateY(-5px);
}

.coop-card .coop-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.coop-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #333;
}

.coop-card p {
    color: #666;
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.coop-benefits {
    list-style: none;
}

.coop-benefits li {
    padding: 8px 0;
    color: #555;
    font-size: 14px;
    border-bottom: 1px dashed #eee;
}

.coop-benefits li::before {
    content: '✓ ';
    color: #0099cc;
    font-weight: 700;
}

/* ========== 合作优势 ========== */
.advantages {
    padding: 80px 0;
    background: #f8f9fa;
}

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

.advantage-item {
    padding: 30px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.advantage-item h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #333;
}

.advantage-item p {
    color: #666;
    font-size: 14px;
}

/* ========== CTA ========== */
.cta-section {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
}

.cta-section h2 {
    font-size: 32px;
    margin-bottom: 15px;
    color: #333;
}

.cta-section p {
    font-size: 16px;
    color: #666;
    margin-bottom: 30px;
}

/* ========== 联系页面 ========== */
.contact-section {
    padding: 80px 0;
}

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

.contact-info h2,
.contact-form h2 {
    font-size: 24px;
    margin-bottom: 30px;
    color: #333;
}

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

.info-icon {
    font-size: 28px;
    flex-shrink: 0;
}

.info-item h4 {
    font-size: 16px;
    color: #333;
    margin-bottom: 5px;
}

.info-item p {
    color: #555;
    font-size: 15px;
}

.info-item .sub-text {
    color: #999;
    font-size: 13px;
    margin-top: 3px;
}

/* ========== 表单 ========== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: #555;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0099cc;
    box-shadow: 0 0 0 3px rgba(0, 153, 204, 0.1);
}

.form-group textarea {
    resize: vertical;
}

/* ========== 页脚 ========== */
.footer {
    background: #1a1a2e;
    color: #ccc;
    padding: 60px 0 20px;
}

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

.footer-col h3 {
    color: #fff;
    font-size: 20px;
    margin-bottom: 15px;
}

.footer-col h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 15px;
}

.footer-col p {
    font-size: 14px;
    line-height: 2;
}

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

.footer-col ul li a {
    color: #ccc;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-col ul li a:hover {
    color: #0099cc;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 20px;
    text-align: center;
    font-size: 13px;
    color: #888;
}

/* ========== 响应式布局 ========== */
@media (max-width: 1024px) {
    .highlights-grid,
    .services-grid,
    .stats-grid,
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        padding: 20px;
    }

    .nav.active {
        display: block;
    }

    .nav ul {
        flex-direction: column;
        gap: 15px;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .banner {
        height: 400px;
    }

    .banner-content h2 {
        font-size: 32px;
    }

    .banner-content p {
        font-size: 16px;
    }

    .highlights-grid,
    .services-grid,
    .stats-grid,
    .process-steps {
        grid-template-columns: 1fr;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

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

    .section-title {
        font-size: 26px;
    }
}