/* =====================================================
   上海千安网络科技有限公司 - 官网样式
   ===================================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family:
        "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    overflow-x: hidden;
}

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

ul,
ol {
    list-style: none;
}

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

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #1a5fb4, #3584e4);
    color: #fff;
    box-shadow: 0 4px 15px rgba(26, 95, 180, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(26, 95, 180, 0.4);
}

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

.btn-outline:hover {
    background: #fff;
    color: #1a5fb4;
}

.btn-block {
    display: block;
    width: 100%;
}

/* =====================================================
   导航栏样式
   ===================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 30px rgba(0, 0, 0, 0.15);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

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

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: #1a5fb4;
}

.logo-sub {
    font-size: 10px;
    color: #666;
    letter-spacing: 1px;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-link {
    font-size: 16px;
    color: #333;
    font-weight: 500;
    position: relative;
    padding: 10px 0;
    cursor: pointer;
}

.nav-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #1a5fb4, #3584e4);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: #1a5fb4;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background: #333;
    transition: all 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* =====================================================
   首页Banner样式
   ===================================================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: url("../images/bg.png") center center / cover no-repeat;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
}

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

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

.hero-title {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: 20px;
    opacity: 0.95;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-desc {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.9;
    animation: fadeInUp 1s ease 0.4s both;
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeInUp 1s ease 0.6s both;
}

.scroll-down {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: #fff;
    text-align: center;
    animation: bounce 2s infinite;
    cursor: pointer;
}

.scroll-down span {
    display: block;
    font-size: 14px;
    margin-bottom: 5px;
}

.scroll-down i {
    font-size: 24px;
}

/* =====================================================
   数据统计样式
   ===================================================== */
.stats {
    background: #fff;
    padding: 60px 0;
    border-bottom: 1px solid #eee;
}

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

.stat-item {
    text-align: center;
    padding: 30px 20px;
}

.stat-number {
    font-size: 48px;
    font-weight: bold;
    color: #1a5fb4;
    display: block;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 16px;
    color: #666;
}

/* =====================================================
   板块通用样式
   ===================================================== */
.section {
    padding: 100px 0;
}

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

.section-title {
    font-size: 36px;
    font-weight: bold;
    color: #1a5fb4;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #1a5fb4, #3584e4);
}

.section-subtitle {
    font-size: 16px;
    color: #999;
    margin-top: 20px;
    letter-spacing: 2px;
}

/* =====================================================
   关于我们样式
   ===================================================== */
.about {
    background: #f8f9fa;
}

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

.about-text h3 {
    font-size: 28px;
    color: #333;
    margin-bottom: 20px;
}

.about-text p {
    font-size: 16px;
    line-height: 1.8;
    color: #555;
    margin-bottom: 20px;
    text-align: justify;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-top: 30px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-item i {
    color: #1a5fb4;
    font-size: 20px;
}

.feature-item span {
    font-size: 16px;
    color: #333;
}

.about-image {
    position: relative;
}

.image-placeholder {
    width: 100%;
    height: 400px;
    background: linear-gradient(135deg, #1a5fb4, #3584e4);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 20px 50px rgba(26, 95, 180, 0.3);
}

.image-placeholder i {
    font-size: 80px;
    margin-bottom: 20px;
    opacity: 0.8;
}

.image-placeholder span {
    font-size: 18px;
    opacity: 0.8;
}

/* =====================================================
   核心优势样式
   ===================================================== */
.advantages {
    background: linear-gradient(135deg, #1a5fb4 0%, #3584e4 100%);
    color: #fff;
}

.advantages .section-title {
    color: #fff;
}

.advantages .section-title::after {
    background: #fff;
}

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

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

.advantage-card {
    text-align: center;
    padding: 40px 25px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.advantage-card:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-10px);
}

.advantage-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.advantage-icon i {
    font-size: 36px;
    color: #fff;
}

.advantage-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
}

.advantage-card p {
    font-size: 14px;
    opacity: 0.9;
    line-height: 1.6;
}

/* =====================================================
   服务项目样式
   ===================================================== */
.services {
    background: #fff;
}

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

.service-card {
    background: #fff;
    border-radius: 15px;
    padding: 40px 30px;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid #eee;
    cursor: pointer;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(26, 95, 180, 0.15);
    border-color: #3584e4;
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: linear-gradient(135deg, #1a5fb4, #3584e4);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-icon i {
    font-size: 36px;
    color: #fff;
}

.service-card h3 {
    font-size: 22px;
    font-weight: bold;
    color: #333;
    margin-bottom: 15px;
    text-align: center;
}

.service-card > p {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
    margin-bottom: 20px;
    text-align: center;
}

.service-list {
    margin-top: 20px;
}

.service-list li {
    font-size: 14px;
    color: #555;
    padding: 8px 0;
    border-bottom: 1px dashed #eee;
    position: relative;
    padding-left: 20px;
}

.service-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #1a5fb4;
}

.service-list li:last-child {
    border-bottom: none;
}

.service-more {
    display: block;
    text-align: center;
    margin-top: 20px;
    color: #1a5fb4;
    font-size: 14px;
    font-weight: 500;
}

.service-more i {
    margin-left: 5px;
    transition: transform 0.3s ease;
}

.service-card:hover .service-more i {
    transform: translateX(5px);
}

/* =====================================================
   成功案例样式
   ===================================================== */
.cases {
    background: #f8f9fa;
}

/* 案例轮播样式 */
.cases-slider-wrapper {
    position: relative;
    padding: 0 60px;
}

.cases-slider {
    overflow: hidden;
    border-radius: 15px;
}

.cases-slider-track {
    display: flex;
    transition: transform 0.5s ease;
    gap: 20px;
}

.cases-slider-track .case-card {
    min-width: calc(33.333% - 14px);
    flex-shrink: 0;
}

/* 轮播按钮 */
.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slider-btn:hover {
    background: #1a5fb4;
    color: #fff;
    box-shadow: 0 6px 20px rgba(26, 95, 180, 0.3);
}

.slider-btn i {
    font-size: 20px;
}

.slider-prev {
    left: 0;
}

.slider-next {
    right: 0;
}

/* 轮播指示点 */
.slider-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
}

.slider-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #ddd;
    cursor: pointer;
    transition: all 0.3s ease;
}

.slider-dot.active {
    background: #1a5fb4;
    transform: scale(1.2);
}

.case-card {
    background: #fff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    cursor: pointer;
}

.case-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.case-image {
    height: 160px;
    background: linear-gradient(135deg, #62a0ea, #99c1f1);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.case-placeholder {
    color: #fff;
    font-size: 50px;
    opacity: 0.8;
}

.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(26, 95, 180, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.case-overlay span {
    color: #fff;
    font-size: 16px;
    padding: 10px 25px;
    border: 2px solid #fff;
    border-radius: 30px;
}

.case-card:hover .case-overlay {
    opacity: 1;
}

.case-info {
    padding: 25px;
}

.case-info h3 {
    font-size: 18px;
    font-weight: bold;
    color: #333;
    margin-bottom: 8px;
}

.case-info > p {
    font-size: 14px;
    color: #999;
    margin-bottom: 15px;
}

.case-result {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.case-result span {
    font-size: 13px;
    color: #1a5fb4;
}

.case-result i {
    color: #28a745;
    margin-right: 5px;
}

/* =====================================================
   合作流程样式
   ===================================================== */
.process {
    background: #fff;
}

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

.process-timeline::before {
    content: "";
    position: absolute;
    top: 40px;
    left: 10%;
    width: 80%;
    height: 2px;
    background: linear-gradient(90deg, #1a5fb4, #3584e4);
}

.process-item {
    text-align: center;
    position: relative;
}

.process-number {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #1a5fb4, #3584e4);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: bold;
    color: #fff;
    margin: 0 auto 25px;
    position: relative;
    z-index: 1;
    box-shadow: 0 5px 20px rgba(26, 95, 180, 0.3);
}

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

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

/* =====================================================
   联系我们样式
   ===================================================== */
.contact {
    background: #f8f9fa;
}

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

.contact-info {
    padding: 40px;
    background: linear-gradient(135deg, #1a5fb4, #3584e4);
    border-radius: 20px;
    color: #fff;
}

.contact-info h3 {
    font-size: 28px;
    margin-bottom: 15px;
}

.contact-info > p {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 30px;
}

.info-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.info-icon {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.info-icon i {
    font-size: 20px;
    color: #fff;
}

.info-text h4 {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 5px;
}

.info-text p {
    font-size: 15px;
    opacity: 0.9;
}

.contact-form {
    background: #fff;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

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

.form-group label {
    display: block;
    font-size: 14px;
    color: #333;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group label .required {
    color: #e74c3c;
}

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

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #1a5fb4;
    box-shadow: 0 0 0 3px rgba(26, 95, 180, 0.1);
}

.form-group input.error,
.form-group textarea.error {
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

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

.error-message {
    display: block;
    color: #e74c3c;
    font-size: 12px;
    margin-top: 5px;
}

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

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-logo .logo-text {
    color: #fff;
}

.footer-logo .logo-sub {
    color: rgba(255, 255, 255, 0.6);
}

.footer-info p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 10px;
}

.footer-links h4,
.footer-services h4,
.footer-contact h4 {
    font-size: 18px;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
}

.footer-links h4::after,
.footer-services h4::after,
.footer-contact h4::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: #1a5fb4;
}

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

.footer-links ul li a,
.footer-services ul li a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    transition: all 0.3s ease;
    cursor: pointer;
}

.footer-links ul li a:hover,
.footer-services ul li a:hover {
    color: #fff;
    padding-left: 5px;
}

.footer-contact p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 12px;
}

.footer-contact i {
    margin-right: 10px;
    width: 20px;
}

.footer-bottom {
    padding: 25px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 5px;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom a:hover {
    color: #fff;
}

/* =====================================================
   返回顶部按钮
   ===================================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #1a5fb4, #3584e4);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(26, 95, 180, 0.3);
    z-index: 999;
    border: none;
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(26, 95, 180, 0.5);
}

/* =====================================================
   模态框样式
   ===================================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: #fff;
    border-radius: 15px;
    width: 90%;
    max-width: 700px;
    max-height: 80vh;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    border-bottom: 1px solid #eee;
    background: #f8f9fa;
}

.modal-header h3 {
    font-size: 20px;
    color: #333;
}

.modal-close {
    font-size: 28px;
    color: #999;
    cursor: pointer;
    transition: color 0.3s ease;
    line-height: 1;
}

.modal-close:hover {
    color: #333;
}

.modal-body {
    padding: 25px;
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer {
    padding: 20px 25px;
    border-top: 1px solid #eee;
    text-align: center;
    background: #f8f9fa;
}

/* 服务详情样式 */
.service-detail h4,
.case-detail h4 {
    font-size: 18px;
    color: #333;
    margin: 25px 0 15px;
}

.service-detail h4:first-child,
.case-detail h4:first-child {
    margin-top: 0;
}

.service-detail p,
.case-detail p {
    font-size: 15px;
    color: #666;
    line-height: 1.8;
}

.service-detail ul,
.case-detail ul {
    margin-left: 20px;
}

.service-detail ul li,
.case-detail ul li {
    font-size: 15px;
    color: #555;
    padding: 8px 0;
    list-style: disc;
}

/* 案例详情样式 */
.case-header {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.case-tag {
    display: inline-block;
    padding: 5px 15px;
    background: #e8f0fc;
    color: #1a5fb4;
    font-size: 13px;
    border-radius: 20px;
}

.case-results {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 25px;
    text-align: center;
}

.result-item {
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.result-number {
    display: block;
    font-size: 28px;
    font-weight: bold;
    color: #1a5fb4;
    margin-bottom: 5px;
}

.result-label {
    font-size: 14px;
    color: #666;
}

/* =====================================================
   Toast提示样式
   ===================================================== */
.toast {
    position: fixed;
    top: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: #fff;
    padding: 15px 30px;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 10px;
}

.toast-content i {
    font-size: 24px;
    color: #28a745;
}

.toast-content span {
    font-size: 16px;
    color: #333;
}

.toast.error .toast-content i {
    color: #e74c3c;
}

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

@keyframes bounce {
    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-15px);
    }
    60% {
        transform: translateX(-50%) translateY(-7px);
    }
}

/* =====================================================
   响应式设计
   ===================================================== */
@media (max-width: 1200px) {
    .container {
        max-width: 960px;
    }

    .cases-slider-track .case-card {
        min-width: calc(50% - 10px);
    }
}

@media (max-width: 992px) {
    .nav-list {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        gap: 0;
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav-list.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        display: block;
        padding: 15px 0;
        border-bottom: 1px solid #eee;
    }

    .menu-toggle {
        display: flex;
    }

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

    .about-image {
        order: -1;
    }

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

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

    .process-timeline {
        grid-template-columns: repeat(2, 1fr);
    }

    .process-timeline::before {
        display: none;
    }

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

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

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

    .hero-btns {
        flex-direction: column;
        align-items: center;
    }

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

    .stat-number {
        font-size: 36px;
    }

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

    .cases-slider-wrapper {
        padding: 0 50px;
    }

    .cases-slider-track .case-card {
        min-width: 100%;
    }

    .slider-btn {
        width: 40px;
        height: 40px;
    }

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

    .process-timeline {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-links h4::after,
    .footer-services h4::after,
    .footer-contact h4::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .case-results {
        grid-template-columns: 1fr;
    }

    .modal-content {
        width: 95%;
        margin: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 26px;
    }

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

    .btn {
        padding: 12px 28px;
        font-size: 15px;
    }

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

    .contact-info,
    .contact-form {
        padding: 25px;
    }

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