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

:root {
    --primary-blue: #007AFF;
    --text-dark: #1C1E21;
    --text-gray: #606770;
    --text-light: #8A8D91;
    --bg-white: #FFFFFF;
    --bg-light: #F7F8FA;
    --border-color: #E4E6EB;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-dark);
    background: var(--bg-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul {
    list-style: none;
}

/* ==================== 导航栏样式 ==================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 32px;
    flex: 1;
}

.nav-logo img {
    display: block;
    height: 40px;
}

.nav-menu {
    display: flex;
    gap: 4px;
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-dark);
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
}

.nav-link:hover {
    background: var(--bg-light);
    color: var(--primary-blue);
}

.dropdown-icon {
    transition: transform 0.3s ease;
}

.nav-item.active .dropdown-icon {
    transform: rotate(180deg);
}

/* 菜单背景遮罩 */
.menu-backdrop {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 998;
    pointer-events: none;
}

.menu-backdrop.active {
    opacity: 1;
    visibility: visible;
}

/* 巨型菜单样式 */
.mega-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 40px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    z-index: 999;
}

.nav-item:hover .mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mega-menu-content {
    display: flex;
    gap: 48px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.menu-column h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.menu-column ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.menu-column ul li a {
    font-size: 15px;
    color: var(--text-dark);
    transition: var(--transition);
    display: block;
    padding: 4px 0;
}

.menu-column ul li a:hover {
    color: var(--primary-blue);
    padding-left: 8px;
}

/* 导航栏右侧按钮 */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-link-external {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-dark);
    transition: var(--transition);
}

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

.btn-primary {
    background: var(--primary-blue);
    color: white;
    padding: 10px 24px;
    border-radius: 24px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background: #0066DD;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-large {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    color: var(--primary-blue);
    padding: 14px 32px;
    border-radius: 24px;
    font-size: 16px;
    font-weight: 600;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(0, 122, 255, 0.05);
}

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* ==================== Hero 区域样式 ==================== */
.hero {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        rgba(173, 216, 230, 0.3) 0%,
        rgba(176, 196, 222, 0.3) 25%,
        rgba(221, 160, 221, 0.3) 50%,
        rgba(216, 191, 216, 0.3) 75%,
        rgba(230, 230, 250, 0.3) 100%
    );
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 0 40px;
    text-align: left;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 16px;
    color: var(--text-dark);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--text-dark);
    letter-spacing: -0.01em;
}

.hero-description {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-gray);
    margin-bottom: 40px;
    max-width: 900px;
}

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

/* ==================== 特性区域样式 ==================== */
.features {
    padding: 100px 0; /* 移除左右 padding */
    background: var(--bg-white);
}

.features-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px; /* 添加左右 padding */
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.section-header p {
    font-size: 18px;
    color: var(--text-gray);
    max-width: 900px;
    margin: 0 auto 20px;
}

.get-model-link {
    display: inline-block;
    margin-top: 16px;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-blue);
    transition: var(--transition);
}

.get-model-link:hover {
    color: #0066DD;
    transform: translateX(4px);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-light);
    border-radius: var(--border-radius);
    padding: 28px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
    aspect-ratio: 1 / 1;
    overflow: hidden;
}

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

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-dark);
    flex-shrink: 0;
}

.feature-content {
    flex: 1;
    overflow: hidden;
    position: relative;
    margin-bottom: 12px;
}

.feature-card:not(.expanded) .feature-content {
    max-height: 120px;
}

.feature-card.expanded .feature-content {
    max-height: none;
    overflow-y: auto;
}

.feature-text {
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-gray);
    margin: 0;
}

.feature-card:not(.expanded) .feature-content::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: linear-gradient(to bottom, transparent, var(--bg-light));
}

.show-more-btn {
    background: transparent;
    border: none;
    color: var(--text-gray);
    font-size: 14px;
    cursor: pointer;
    padding: 8px 0;
    text-align: left;
    transition: var(--transition);
    flex-shrink: 0;
}

.show-more-btn:hover {
    color: var(--primary-blue);
}

.feature-card.expanded .show-more-btn {
    display: none;
}

.feature-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary-blue);
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
    margin-top: auto;
    flex-shrink: 0;
}

.feature-link:hover {
    gap: 10px;
}

/* ==================== 分割线样式 ==================== */
.section-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0 auto;
    max-width: 1320px; /* 1400 - 80 padding */
}

/* ==================== 模型架构展示区域样式 ==================== */
.model-architecture {
    padding: 100px 0; /* 移除左右 padding */
    background: var(--bg-white);
}

.architecture-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px; /* 添加左右 padding */
}

.architecture-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin: 80px 0;
}

.architecture-item.reverse {
    direction: rtl;
}

.architecture-item.reverse > * {
    direction: ltr;
}

.architecture-text h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-dark);
}

.architecture-text p {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-gray);
    margin-bottom: 16px;
}

.architecture-text strong {
    color: var(--text-dark);
    font-weight: 600;
}

.architecture-image {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.architecture-image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
}

/* ==================== 全球训练数据区域样式 ==================== */
.global-data {
    padding: 100px 0;
    background: var(--bg-white);
}

.global-data h2 {
    text-align: center;
    margin-bottom: 60px;
}

.global-data-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.data-overview-section {
    margin: 60px 0;
}

.overview-content {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 60px;
    align-items: center;
}

.overview-text h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-dark);
}

.overview-text p {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-gray);
    margin-bottom: 16px;
}

.overview-text strong {
    color: var(--primary-blue);
    font-weight: 700;
}

.overview-map {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.overview-map img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
}

/* 数据可视化 - 新布局（一行一个数据集）*/
.dataset-row {
    display: grid;
    grid-template-columns: 0.75fr 1fr;
    gap: 60px;
    margin: 60px 0;
    align-items: center;
}

.dataset-map {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dataset-map img {
    width: 100%;
    height: auto;
    display: block;
}

.dataset-chart {
    width: 100%;
}

.dataset-chart canvas {
    width: 100%;
    height: auto;
    display: block;
}

.dataset-description {
    margin-top: 30px;
    margin-bottom: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
}

.dataset-description:last-of-type {
    border-bottom: none;
}

.dataset-description h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.dataset-description p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-gray);
    margin-bottom: 16px;
}

.dataset-description strong {
    color: var(--text-dark);
    font-weight: 700;
}

.dataset-link,
.learn-more-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-blue);
    transition: var(--transition);
}

.dataset-link:hover,
.learn-more-link:hover {
    color: #0066DD;
    gap: 10px;
}

/* ==================== TransCity Capabilities 视频区域样式 ==================== */
.capabilities-video {
    padding: 100px 0; /* 移除左右 padding */
    background: var(--bg-white);
}

.capabilities-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px; /* 添加左右 padding */
}

.start-building-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-blue);
    margin-top: 16px;
    transition: var(--transition);
}

.start-building-link:hover {
    transform: translateX(4px);
}

.capabilities-layout {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 60px;
    margin-top: 60px;
    align-items: start;
}

/* 左侧文字段落 */
.capabilities-text {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: sticky;
    top: 100px;
}

.capability-segment {
    border-top: 1px solid var(--border-color);
    transition: var(--transition);
}

.capability-segment:last-child {
    border-bottom: 1px solid var(--border-color);
}

.segment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    cursor: pointer;
    user-select: none;
}

.capability-segment h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
    transition: var(--transition);
}

.capability-segment:hover h3 {
    color: var(--primary-blue);
}

.capability-segment.active h3 {
    color: var(--primary-blue);
}

.toggle-btn {
    background: transparent;
    border: none;
    font-size: 24px;
    color: var(--text-gray);
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    flex-shrink: 0;
}

.toggle-btn:hover {
    color: var(--primary-blue);
}

.capability-segment.active .toggle-btn {
    color: var(--primary-blue);
}

.segment-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    padding: 0;
}

.capability-segment.active .segment-content {
    max-height: 300px;
    padding-bottom: 20px;
}

.segment-content p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-gray);
    margin-bottom: 12px;
}

.segment-content p:last-child {
    margin-bottom: 0;
}

/* 右侧视频 */
.capabilities-video-container {
    width: 100%;
    position: relative;
    background: linear-gradient(135deg, 
        rgba(173, 216, 230, 0.15) 0%,
        rgba(176, 196, 222, 0.15) 25%,
        rgba(221, 160, 221, 0.15) 50%,
        rgba(216, 191, 216, 0.15) 75%,
        rgba(230, 230, 250, 0.15) 100%
    );
    border-radius: var(--border-radius);
    overflow: hidden;
}

.capabilities-video-container video {
    width: 100%;
    height: auto;
    display: block;
}

/* ==================== Resources 区域样式 ==================== */
.resources {
    padding: 100px 0; /* 移除左右 padding */
    background: var(--bg-light);
}

.resources-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px; /* 添加左右 padding */
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.resource-card {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    padding: 40px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.resource-icon {
    margin-bottom: 24px;
}

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

.resource-card p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-gray);
    margin-bottom: 24px;
    flex: 1;
}

.resource-btn {
    display: inline-block;
    background: var(--primary-blue);
    color: white;
    padding: 12px 28px;
    border-radius: 24px;
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
    align-self: flex-start;
}

.resource-btn:hover {
    background: #0066DD;
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}


.tabs {
    margin-top: 48px;
}

.tab-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.tab-btn {
    background: transparent;
    border: 2px solid var(--border-color);
    padding: 12px 28px;
    border-radius: 24px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

.tab-btn.active {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
    color: white;
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

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

.tab-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.tab-text h3 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-dark);
}

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

.capability-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.capability-list li {
    font-size: 16px;
    color: var(--text-gray);
    padding-left: 28px;
    position: relative;
}

.capability-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
    font-size: 18px;
}

.visual-placeholder {
    border-radius: var(--border-radius);
    overflow: hidden;
}

/* ==================== 合作伙伴区域样式 ==================== */
.partners {
    padding: 100px 40px;
    background: var(--bg-light);
}

.partners-container {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.partners-container h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 64px;
    color: var(--text-dark);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 32px 48px;
    align-items: center;
    justify-items: center;
}

.partner-logo {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-gray);
    transition: var(--transition);
    padding: 12px 20px;
}

.partner-logo:hover {
    color: var(--text-dark);
    transform: scale(1.05);
}

/* ==================== CTA 区域样式 ==================== */
.cta-section {
    padding: 100px 40px;
    background: var(--bg-white);
}

.cta-container {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.cta-container h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.cta-container p {
    font-size: 18px;
    color: var(--text-gray);
    margin-bottom: 40px;
}

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

/* ==================== 页脚样式（学术风格）==================== */
.footer {
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    padding: 64px 0 32px; /* 移除左右 padding */
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px; /* 添加左右 padding */
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 80px;
    margin-bottom: 48px;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.footer-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 8px;
}

.publication-authors {
    font-size: 14px;
    color: var(--text-gray);
    margin: 0;
}

.publication-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
}

.publication-venue {
    font-size: 14px;
    color: var(--text-gray);
    margin: 0;
}

.team-member {
    font-size: 14px;
    color: var(--text-gray);
    margin: 0;
    line-height: 1.8;
}

.team-member strong {
    color: var(--text-dark);
    font-weight: 600;
}

.scholar-link {
    color: inherit;
    transition: var(--transition);
}

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

.scholar-link strong {
    transition: var(--transition);
}

.scholar-link:hover strong {
    color: var(--primary-blue);
}

.footer-right p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 8px;
}

.contact-email {
    font-size: 15px;
    color: var(--primary-blue);
    font-weight: 500;
    display: inline-block;
    margin-bottom: 0;
    transition: var(--transition);
}

.contact-email:hover {
    color: #0066DD;
}

.university-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 16px;
}

.uni-logo-img {
    width: 160px;
    height: auto;
    opacity: 0.85;
    transition: var(--transition);
}

.uni-logo-img:hover {
    opacity: 1;
}

.project-logos {
    display: flex;
    gap: 16px;
    align-items: center;
    margin-top: 20px;
}

.project-logo {
    height: 50px;
    width: auto;
    opacity: 0.85;
    transition: var(--transition);
}

.project-logo:hover {
    opacity: 1;
    transform: scale(1.05);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 14px;
    color: var(--text-gray);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 48px;
    }
    
    .hero-subtitle {
        font-size: 32px;
    }
    
    .tab-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .section-header h2 {
        font-size: 40px;
    }
    
    .architecture-item {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .architecture-item.reverse {
        direction: ltr;
    }
    
    .data-visualization {
        grid-template-columns: 1fr;
    }
    
    .overview-content {
        grid-template-columns: 1fr;
    }
    
    .europe-section {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 40px;
    }
    
    .nav-left .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 80px 40px 60px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 24px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .features {
        padding: 60px 20px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .section-header h2 {
        font-size: 32px;
    }
    
    .tab-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .tab-text h3 {
        font-size: 28px;
    }
    
    .partners-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: 24px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .project-logos {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .architecture-text h2 {
        font-size: 28px;
    }
    
    .architecture-text p {
        font-size: 16px;
    }
    
    .overview-content {
        grid-template-columns: 1fr;
    }
    
    .dataset-row {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .capabilities-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .capabilities-text {
        position: relative;
        top: 0;
    }
    
    .resources-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}