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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    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;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.nav-brand .slogan {
    font-size: 0.75rem;
    color: var(--text-light);
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 80px;
}

.hero-image-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    background: linear-gradient(135deg, #1e40af 0%, #059669 100%); /* 图片缺失时的备用背景 */
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* 如果图片加载失败，显示备用背景 */
.hero-image:not([src]),
.hero-image[src=""] {
    display: none;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.8) 0%, rgba(16, 185, 129, 0.7) 100%);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    color: white;
    width: 100%;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 300;
}

.hero-slogan {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #fef3c7;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

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

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

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

.btn-secondary:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

/* Section样式 */
.section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.125rem;
    margin-bottom: 3rem;
}

.bg-light {
    background: var(--bg-light);
}

/* 产品定位卡片 */
.positioning-card {
    background: white;
    border-radius: 1rem;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    margin-top: 2rem;
}

.positioning-card h3 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.positioning-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.positioning-item {
    text-align: center;
    padding: 1.5rem;
}

.positioning-item .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.positioning-item h4 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.positioning-item p {
    color: var(--text-light);
    line-height: 1.8;
}

.architecture-diagram {
    margin: 3rem 0;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
}

.diagram-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.diagram-box {
    padding: 1.5rem 2rem;
    border-radius: 0.5rem;
    text-align: center;
    font-weight: 600;
    min-width: 150px;
}

.diagram-box.primary {
    background: var(--primary-color);
    color: white;
}

.diagram-box.secondary {
    background: var(--secondary-color);
    color: white;
}

.diagram-box.connector {
    background: var(--bg-white);
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.diagram-box small {
    display: block;
    font-size: 0.875rem;
    margin-top: 0.5rem;
    opacity: 0.9;
}

.diagram-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: bold;
}

.positioning-intro {
    text-align: center;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.positioning-philosophy {
    text-align: center;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-dark);
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 0.5rem;
}

/* 课程网格 */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.course-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

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

.course-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.course-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.course-card p {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* AI服务 */
.ai-services-container {
    margin-top: 3rem;
}

.ai-service-category {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.ai-service-category.featured {
    border: 2px solid var(--secondary-color);
    background: linear-gradient(135deg, #f0fdf4 0%, #ffffff 100%);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.category-icon {
    font-size: 2.5rem;
}

.category-header h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    flex: 1;
}

.badge {
    background: var(--secondary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.category-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.ai-feature {
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    transition: all 0.3s;
}

.ai-feature:hover {
    background: white;
    box-shadow: var(--shadow);
}

.ai-feature.highlight {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-left: 4px solid var(--primary-color);
}

.ai-feature.success {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border-left: 4px solid var(--secondary-color);
}

.ai-feature h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

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

.feature-list {
    list-style: none;
    margin-top: 1rem;
    padding-left: 0;
}

.feature-list li {
    padding: 0.5rem 0;
    color: var(--text-light);
    padding-left: 1.5rem;
    position: relative;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* 契合度网格 */
.fit-highlights {
    margin-bottom: 3rem;
}

.highlight-box {
    background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
    border: 2px solid var(--primary-color);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.highlight-box h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.highlight-box p {
    color: var(--text-dark);
    line-height: 1.8;
    font-size: 1.125rem;
}

.fit-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.fit-item {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s;
}

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

.fit-number {
    display: inline-block;
    width: 60px;
    height: 60px;
    line-height: 60px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.fit-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.fit-item h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.fit-item p {
    color: var(--text-light);
    line-height: 1.8;
}

/* 定价网格 */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.pricing-card {
    background: white;
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    text-align: center;
    position: relative;
    transition: all 0.3s;
}

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

.pricing-card.highlight {
    border: 2px solid var(--primary-color);
    background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: bold;
}

.pricing-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    display: block;
}

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

.pricing-price {
    margin: 1.5rem 0;
    padding: 1.5rem 0;
    border-top: 2px solid var(--border-color);
    border-bottom: 2px solid var(--border-color);
}

.price-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: inline-block;
}

.price-unit {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-left: 0.5rem;
}

.price-period {
    font-size: 0.875rem;
}

.pricing-desc {
    color: var(--text-light);
    margin: 1rem 0;
    font-size: 0.95rem;
}

.pricing-options {
    margin: 1.5rem 0;
    padding: 1.5rem 0;
    border-top: 2px solid var(--border-color);
    border-bottom: 2px solid var(--border-color);
}

.pricing-option {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.pricing-option:last-child {
    border-bottom: none;
}

.option-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.option-name {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 1.125rem;
}

.option-price {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.option-desc {
    color: var(--text-light);
    font-size: 0.875rem;
    text-align: left;
    margin-top: 0.5rem;
}

.option-note {
    color: #f59e0b;
    font-size: 0.8125rem;
    text-align: left;
    margin-top: 0.5rem;
    font-style: italic;
}

.pricing-features {
    list-style: none;
    margin-top: 2rem;
    text-align: left;
    padding: 0;
}

.pricing-features li {
    padding: 0.75rem 0;
    color: var(--text-dark);
    border-bottom: 1px solid #f3f4f6;
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-note {
    margin-top: 3rem;
    padding: 2rem;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-radius: 1rem;
    border-left: 4px solid #f59e0b;
}

.pricing-note p {
    margin: 0.75rem 0;
    color: var(--text-dark);
    line-height: 1.8;
}

.pricing-note strong {
    color: #92400e;
}

/* 团队介绍 */
.team-intro {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.team-intro-card {
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    padding: 2rem;
    border-radius: 1rem;
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow);
}

.team-intro-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.team-intro-card p {
    color: var(--text-dark);
    line-height: 1.8;
}

.team-intro-card strong {
    color: var(--primary-color);
    font-weight: 600;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.team-member {
    background: white;
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    text-align: center;
    position: relative;
    transition: all 0.3s;
}

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

.team-member.highlight {
    border: 2px solid var(--primary-color);
    background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
}

.member-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    font-size: 1.5rem;
}

.member-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    display: block;
}

.team-member h3 {
    font-size: 1.375rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.member-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tag {
    background: var(--primary-color);
    color: white;
    padding: 0.375rem 0.875rem;
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 500;
}

.member-desc {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.9375rem;
}

.team-strengths {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 2px solid var(--border-color);
}

.team-strengths h3 {
    text-align: center;
    font-size: 1.875rem;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.strengths-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.strength-item {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s;
}

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

.strength-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.strength-item h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.strength-item p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.9375rem;
}

/* 价值网格 */
.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.value-card {
    background: white;
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
}

.value-card.highlight {
    border: 2px solid var(--primary-color);
    background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
}

.value-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.value-list {
    list-style: none;
}

.value-list li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-dark);
    line-height: 1.8;
}

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

.integration-box {
    margin-top: 3rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 3rem;
    border-radius: 1rem;
    text-align: center;
}

.integration-box h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.integration-box p {
    font-size: 1.125rem;
    line-height: 1.8;
    opacity: 0.95;
}

/* 案例网格 */
.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.case-card {
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all 0.3s;
}

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

.case-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 1.5rem;
}

.case-header h3 {
    font-size: 1.25rem;
}

.case-content {
    padding: 1.5rem;
}

.case-content p {
    margin-bottom: 1rem;
    color: var(--text-dark);
    line-height: 1.8;
}

/* 合作模式 */
.partnership-modes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.mode-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s;
}

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

.mode-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.mode-card p {
    color: var(--text-light);
}

.partnership-value {
    margin-top: 3rem;
    background: white;
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    text-align: center;
}

.partnership-value h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.partnership-value p {
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.partnership-value p:last-child {
    margin-bottom: 0;
}

/* 联系方式 */
.contact-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.contact-section .section-title,
.contact-section .section-subtitle {
    color: white;
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    text-align: center;
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.contact-item p {
    opacity: 0.9;
}

.qr-placeholder {
    background: rgba(255, 255, 255, 0.2);
    padding: 2rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
}

.cta-box {
    background: white;
    color: var(--text-dark);
    padding: 3rem;
    border-radius: 1rem;
    text-align: center;
}

.cta-box h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.cta-box p {
    margin-bottom: 2rem;
    color: var(--text-light);
}

/* 页脚 */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-slogan {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .diagram-item {
        flex-direction: column;
    }

    .diagram-arrow {
        transform: rotate(90deg);
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}