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

:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --accent-color: #FF3B30;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --text-tertiary: #C7C7CC;
    --background-primary: #FFFFFF;
    --background-secondary: #F5F5F7;
    --background-tertiary: #FAFAFA;
    --border-color: #D2D2D7;
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.12);
    --border-radius: 12px;
    --border-radius-large: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    line-height: 1.5;
    background: var(--background-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 18px;
    color: var(--text-primary);
}

.nav-logo i {
    color: var(--primary-color);
    font-size: 20px;
}

.nav-logo-img {
    height: 24px;
    width: auto;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    margin: 0;
    padding: 0;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.nav-actions {
    display: flex;
    align-items: center;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary:hover {
    background: #0056CC;
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
    border: 1px solid var(--primary-color);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

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

/* 主页横幅 */
.hero {
    height: 100vh;
    min-height: 100vh;
    width: 100%;
    display: flex;
    align-items: stretch;
    padding: 0;
    background: linear-gradient(135deg, #F5F5F7 0%, #FFFFFF 100%);
    position: relative;
    overflow: hidden;
}

/* 覆盖通用 section 的上下 padding，保证首页全屏无额外留白 */
section.hero {
    padding: 0;
}

.hero-slider {
    width: 100%;
    height: 100%;
    display: grid;
    gap: 0;
    padding: 60px 0 0; /* 顶部留白约等于导航高度，使内容紧贴导航底部 */
    box-sizing: border-box;
}

.hero-slide {
    display: none;
    background: white;
    padding: 64px;
    border-radius: 0;
    box-shadow: none;
    height: 100%;
    align-items: center;
    justify-content: center;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
}

.hero-slide:nth-child(1) {
    background-image: url('/static/banner33.png');
}

.hero-slide:nth-child(2) {
    background-image: url('/static/banner22.png');
}

.hero-slide:nth-child(3) {
    background-image: url('/static/banner11.png');
}

.hero-slide.active {
    display: grid;
}

.hero-slide-content {
    display: grid;
    gap: 24px;
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.hero-slider-controls {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 10;
}

.hero-prev,
.hero-next {
    background: white;
    border: 1px solid var(--border-color);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    color: var(--text-primary);
}

.hero-prev:hover,
.hero-next:hover {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-medium);
}

.hero-dots {
    display: flex;
    align-items: center;
    gap: 8px;
}

.hero-dots button {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: none;
    background: var(--text-tertiary);
    cursor: pointer;
    transition: var(--transition);
}

.hero-dots button.active {
    width: 20px;
    border-radius: 999px;
    background: var(--primary-color);
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    width: 100%;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    text-align: center;
}

.title-main {
    display: block;
    color: var(--text-primary);
}

.title-sub {
    display: block;
    color: #000000;
}

.hero-subtitle {
    font-size: 20px;
    color: #434349;
    margin-bottom: 40px;
    line-height: 1.7;
    font-weight: 500;
    text-align: center;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-visual {
    position: relative;
    height: 500px;
}

.hero-image {
    position: relative;
    width: 100%;
    height: 100%;
}

.floating-card {
    position: absolute;
    background: white;
    border-radius: var(--border-radius-large);
    padding: 24px;
    box-shadow: var(--shadow-medium);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
    cursor: pointer;
}

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

.floating-card i {
    font-size: 32px;
    color: var(--primary-color);
}

.floating-card span {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.card-1 {
    top: 20%;
    left: 10%;
    animation: float 6s ease-in-out infinite;
}

.card-2 {
    top: 50%;
    right: 20%;
    animation: float 6s ease-in-out infinite 2s;
}

.card-3 {
    bottom: 20%;
    left: 30%;
    animation: float 6s ease-in-out infinite 4s;
}

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

/* 通用区块样式 */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

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

.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 1.4fr; /* 左侧公司介绍稍小，右侧四块区域稍大 */
    gap: 64px;
    align-items: center;
}

.about-text h3 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.about-text p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.company-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 40px;
}

.info-item {
    text-align: center;
    padding: 24px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

.info-label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.info-value {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.feature-showcase {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr)); /* 2 行 2 列布局 */
    gap: 24px;
}

.feature-item {
    background: white;
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--background-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon i {
    font-size: 20px;
    color: var(--primary-color);
}

.feature-item h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 企业使命 */
.mission {
    background: var(--background-primary);
}

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

.mission-text p {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.ecosystem-diagram {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.ecosystem-item {
    background: white;
    border-radius: var(--border-radius);
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border: 2px solid transparent;
}

.ecosystem-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.ecosystem-item i {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.ecosystem-item span {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 核心优势 */
.advantages {
    background: var(--background-secondary);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

/* 能力平台：固定为 2 行 2 列布局 */
#platform .advantages-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.advantage-card {
    background: white;
    border-radius: var(--border-radius-large);
    padding: 40px;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    text-align: center;
}

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

.advantage-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.advantage-icon i {
    font-size: 32px;
    color: white;
}

.advantage-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.advantage-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 标杆案例 */
.cases {
    background: var(--background-primary);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

/* 语料与解决方案：固定为 2 行 2 列布局 */
#solutions .cases-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.case-card {
    background: white;
    border-radius: var(--border-radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

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

.case-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-image i {
    font-size: 48px;
    color: white;
}

.case-content {
    padding: 32px;
}

.case-content h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.case-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.case-metrics {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.metric {
    background: var(--background-secondary);
    color: var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

/* 联系我们 */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr; /* 左右各占整体宽度的 1/2 */
    gap: 64px;
    align-items: stretch; /* 让左右两列等高 */
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 24px;
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-light);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 20px;
    color: white;
}

.contact-details h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.contact-details p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-form {
    background: white;
    border-radius: var(--border-radius-large);
    padding: 20px;
    box-shadow: var(--shadow-medium);
    height: 100%;                 /* 与左侧信息列等高 */
    display: flex;
    flex-direction: column;
    width: 100%;                  /* 占据右侧 1/2 的全部宽度 */
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

/* 商务合作第一行：3列布局 */
.contact-form .form-row-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: var(--transition);
    background: var(--background-primary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

/* 页脚 */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 80px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 18px;
    margin-bottom: 16px;
}

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

.footer-section p {
    color: #86868B;
    line-height: 1.6;
    margin-bottom: 24px;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

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

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul li a {
    color: #86868B;
    text-decoration: none;
    transition: var(--transition);
}

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

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #86868B;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: #86868B;
    text-decoration: none;
    transition: var(--transition);
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .company-info {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .mission-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .ecosystem-diagram {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .floating-card {
        padding: 16px;
    }
    
    .floating-card i {
        font-size: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero {
        padding: 100px 16px 60px;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .advantage-card,
    .case-card,
    .contact-form {
        padding: 24px;
    }
    
    .ecosystem-diagram {
        grid-template-columns: 1fr;
    }
}

/* 滚动动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 加载动画 */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--background-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loading.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--background-secondary);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}