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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #000000;
    background-color: #f9fafb;
    overflow-x: hidden;
}

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

/* 导航栏样式 */
.dark-header {
    background-color: rgba(0, 0, 0, 0.8);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.dark-header.scrolled {
    background-color: rgba(0, 0, 0, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.dark-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.logo-container img {
    max-height: 60px;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #000000;
    font-weight: bold;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    color: #e41e26;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: #e41e26;
    transition: width 0.3s ease;
}

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

.nav-links a.active {
    color: #e41e26;
}

.nav-links a.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: #000000;
    margin: 5px 0;
    transition: 0.4s;
}

/* 固定侧边栏 */
.fixed-sidebar {
    position: fixed;
    right: 1.5rem;
    bottom: 5rem;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: none;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    transition: none;
}


.sidebar-icon {
    width: 3rem;
    height: 3rem;
    background: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.sidebar-icon:hover {
    transform: scale(1.05);
}

.sidebar-icon i {
    font-size: 1rem;
    color: #6b7280;
}

#backToTop {
    width: 3rem;
    height: 3rem;
    background: #333;
    border-radius: 4px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

#backToTop i {
    color: #fff;
}

#backToTop:hover {
    background: #dc2626;
}

/* 图2顺序：电话 → 微信 → 返回顶部 */
#phoneIcon { order: 1; }
#wechatIcon { order: 2; }
#backToTop { order: 3; }

/* 弹出框样式 */
.contact-popup {
    position: fixed;
    right: 100px;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    display: none;
    animation: fadeIn 0.3s ease;
    min-width: 280px;
}

.contact-popup.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-50%) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(-50%) scale(1);
    }
}

.popup-content {
    padding: 20px;
    position: relative;
}

.popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.popup-header h4 {
    margin: 0;
    color: #333;
    font-size: 18px;
}

.close-popup {
    font-size: 24px;
    color: #999;
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s;
}

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

.phone-info {
    text-align: center;
    padding: 20px 0;
}

.phone-icon {
    font-size: 40px;
    color: #0066cc;
    margin-bottom: 15px;
}

.phone-number {
    font-size: 24px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
    font-family: 'Courier New', monospace;
}

.phone-info p {
    color: #666;
    margin: 0;
    font-size: 14px;
}

.qrcode-container {
    text-align: center;
    padding: 10px 0;
}

.qrcode-img {
    width: 200px;
    height: 200px;
    border: 1px solid #eee;
    border-radius: 5px;
    margin-bottom: 15px;
}

.consult-text {
    color: #666;
    font-size: 14px;
    margin-top: 5px;
}

/* 英雄区域 */
.solutions-hero {
    display: none;
}

.hero-content {
    max-width: 800px;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 3.5rem;
    color: #fff;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.8);
}

.hero-content p {
    font-size: 1.2rem;
    color: #ccc;
    margin-bottom: 30px;
}

/* 区块标题样式 */
.section-title {
    margin-bottom: 50px;
    text-align: center;
}

.section-title h2 {
    font-size: 2.5rem;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    width: 3rem;
    height: 3px;
    background-color: #fff;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
}

/* 项目背景部分 */
.project-background {
    padding: 100px 0;
    background-color: #000000;
}
/* Project Background 内标题与文字颜色覆盖为深色背景下的高对比 */
.project-background .section-title h2 {
    color: #ffffff;
}
.project-background .solution-card .card-content {
    color: #ffffff;
}

/* 解决方案容器 */
.solutions-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    margin-bottom: 50px;
}

/* 解决方案卡片样式 */
.solution-card {
    flex: 1;
    min-width: 300px;
    max-width: 350px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 15px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid rgba(0, 102, 204, 0.2);
}

/* ========== Solutions - 复刻 products 风格 ========== */
.sol-hero {
    position: relative;
    width: 100%;
    background-color: #000000;
}

.sol-hero-img {
    width: 100%;
    height: auto;
    object-fit: cover;
    opacity: 0.8;
    display: block;
}

.sol-hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, #000000, transparent 50%, transparent);
    pointer-events: none;
}

.sol-header {
    position: relative;
    padding-top: 4rem;
    padding-bottom: 3rem;
    overflow: hidden;
    background-color: #000000;
    background-image: url('solution image/背景-solution.jpg');
    background-size: cover;
    background-position: center;
}
.sol-header .sol-title { color: #ffffff; }
.sol-header .sol-title-line { background: #ffffff; }
.sol-header .sol-watermark { color: #ffffff; }

.sol-header-inner {
    text-align: center;
}

.sol-title-wrap {
    position: relative;
    display: inline-block;
}

.sol-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3.75rem;
    font-weight: 900;
    text-transform: uppercase;
    white-space: nowrap;
    color: #fff;
    opacity: 0.2;
    pointer-events: none;
    user-select: none;
}

@media (min-width: 768px) {
    .sol-watermark {
        font-size: 8rem;
    }
}

.sol-title {
    position: relative;
    font-size: 1.875rem;
    font-weight: bold;
    color: #fff;
    z-index: 10;
}

@media (min-width: 768px) {
    .sol-title {
        font-size: 2.25rem;
    }
}

.sol-title-line {
    position: relative;
    height: 4px;
    width: 3rem;
    background: #fff;
    margin: 1rem auto 0;
    z-index: 10;
}

.sol-container {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
}

@media (min-width: 768px) {
    .sol-container {
        padding-left: 6rem;
        padding-right: 6rem;
    }
}

@media (min-width: 1024px) {
    .sol-grid-section .sol-container {
        padding-left: 12rem;
        padding-right: 12rem;
    }
}

/* 文字双栏板块 */
.sol-text-panels {
    background-color: #000000;
    padding: 3rem 0;
}
.sol-text-panels .sol-text-title {
    color: #ffffff;
}
.sol-text-panels .sol-text-panel {
    color: #d1d5db;
}
.sol-text-panels .sol-text-body p {
    color: #d1d5db;
}
.sol-text-panels-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
}
@media (min-width: 1024px) {
    .sol-text-panels-inner {
        grid-template-columns: 1fr 1fr;
    }
}
.sol-text-panel {
    color: #9ca3af;
}
.sol-text-title {
    color: #fff;
    font-size: 1.25rem;
    font-weight: bold;
    margin-bottom: 1rem;
}
.sol-text-body p {
    margin-bottom: 1rem;
    line-height: 1.625;
}

/* 左图右文概览 */
.sol-overview {
    background-color: #000000;
    padding: 2.5rem 0 3.5rem;
}
/* Overview 内文字颜色覆盖为深色背景下的高对比 */
.sol-overview .sol-overview-title {
    color: #ffffff;
}
.sol-overview .sol-overview-desc {
    color: #cccccc;
}
.sol-overview-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    align-items: center;
}
@media (min-width: 1024px) {
    .sol-overview-inner {
        grid-template-columns: 1fr 1fr;
    }
}
.sol-overview-image-wrap {
    position: relative;
    padding: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    justify-content: center;
}
.sol-overview-image-inner {
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 8px;
}
.sol-overview-image {
    width: 100%;
    height: auto;
    object-fit: cover;
    opacity: 0.8;
    display: block;
    max-width: 28rem;
}
.sol-overview-text {
    text-align: center;
}
@media (min-width: 1024px) {
    .sol-overview-text {
        text-align: right;
        padding-right: 1rem;
    }
}
.sol-overview-title {
    color: #fff;
    font-size: 1.25rem;
    font-weight: bold;
    margin-bottom: 0.75rem;
}
.sol-overview-desc {
    color: #9ca3af;
    line-height: 1.625;
    font-size: 0.875rem;
}

/* 居中大图 */
.sol-bus-hero {
    background-color: #f9fafb;
    padding: 2rem 0 3rem;
}
.sol-bus-hero-img {
    width: 100%;
    height: auto;
    max-width: 1200px;
    display: block;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid rgba(255, 255, 255, 0.15);
}
.solution-card:hover {
    transform: translateY(-15px);
    border-color: #0066cc;
    box-shadow: 0 20px 40px rgba(0, 102, 204, 0.3);
}

.card-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
    position: relative;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.solution-card:hover .card-image img {
    transform: scale(1.1);
}

.card-content {
    padding: 25px;
    color: #fff;
}

.card-content h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: #0066cc;
}

.card-content p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #ccc;
    margin-bottom: 20px;
}

.card-badge {
    display: inline-block;
    padding: 5px 15px;
    background: rgba(0, 102, 204, 0.2);
    color: #0066cc;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: bold;
}

/* 解决方案详情部分 */
.solutions-details {
    padding: 100px 0;
    background-color: #f9fafb;
}

.detail-grid {
    display: grid;
    gap: 40px;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 40px;
    padding: 40px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 15px;
    border: 1px solid rgba(0, 102, 204, 0.2);
}

.detail-item:nth-child(even) {
    flex-direction: row-reverse;
}

.detail-image {
    flex: 1;
    border-radius: 10px;
    overflow: hidden;
}

.detail-image img {
    width: 100%;
    height: auto;
    display: block;
}

.detail-text {
    flex: 1;
    color: #fff;
}

.detail-text h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: #fff;
}

.detail-text p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 20px;
    color: #ccc;
}

.feature-list {
    list-style: none;
    margin-top: 20px;
}

.feature-list li {
    padding: 8px 0;
    color: #fff;
    position: relative;
    padding-left: 25px;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #fff;
    font-weight: bold;
}

/* 复刻版：文字+图像排版与点击放大 */
.zoomable {
    cursor: zoom-in;
}

.sol-text-right-image {
    background-color: #f9fafb;
    padding: 3rem 0;
}
.sol-tri-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: center;
}
@media (min-width: 1024px) {
    .sol-tri-inner {
        grid-template-columns: 1fr 1fr;
    }
}
.sol-tri-text h3 {
    color: #fff;
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
}
.sol-tri-text p {
    color: #9ca3af;
    margin-bottom: 1rem;
}
.sol-tri-text ul {
    color: #9ca3af;
    list-style: none;
    padding: 0;
}
.sol-tri-text ul li {
    margin-bottom: 0.5rem;
}
.sol-tri-image img {
    width: 100%;
    height: auto;
    display: block;
    opacity: 0.9;
}

.sol-three-rows-gallery {
    background-color: #f9fafb;
    padding: 2.5rem 0;
}
.sol-row {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1.5rem;
    align-items: center;
    margin-bottom: 2rem;
}
.sol-row-icon {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #9ca3af;
    font-weight: bold;
}
.sol-row-icon img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}
.sol-row-gallery {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}
.sol-row-gallery img {
    width: 100%;
    height: auto;
    display: block;
    border: 1px solid rgba(255,255,255,0.15);
    opacity: 0.9;
    cursor: zoom-in;
}

.sol-left-image-right-text {
    background-color: #f9fafb;
    padding: 3rem 0 3.5rem;
}
.sol-lirt-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: center;
}
@media (min-width: 1024px) {
    .sol-lirt-inner {
        grid-template-columns: 1fr 1fr;
    }
}
.sol-lirt-image img {
    width: 100%;
    height: auto;
    display: block;
    border: 1px solid rgba(255,255,255,0.15);
}
.sol-lirt-text h3 {
    color: #fff;
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 0.75rem;
}
.sol-lirt-text p {
    color: #9ca3af;
    line-height: 1.6;
}
 
.sol-monitor {
    background-color: #f9fafb;
    padding: 3rem 0 3rem;
}
.sol-monitor-title {
    text-align: center;
    color: #fff;
    font-size: 1.8rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
}
.sol-mon-slider {
    position: relative;
    margin-bottom: 2rem;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 0.75rem;
}
.sol-mon-track {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    scroll-behavior: smooth;
    padding: 0.5rem;
    scroll-snap-type: x mandatory;
    overscroll-behavior-x: contain;
}
.sol-mon-track::-webkit-scrollbar {
    height: 8px;
}
.sol-mon-track::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: 8px;
}
.sol-mon-track img {
    flex: 0 0 auto;
    width: 320px;
    max-height: 180px;
    object-fit: cover;
    border: 1px solid rgba(255,255,255,0.15);
    scroll-snap-align: start;
}
.sol-mon-nav {
    position: static;
    width: 40px;
    height: 40px;
    background: rgba(0,0,0,0.6);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 50%;
    cursor: pointer;
    display: grid;
    place-items: center;
    z-index: 1;
}
.sol-monitor-columns {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}
@media (min-width: 1024px) {
    .sol-monitor-columns {
        grid-template-columns: 1fr 1fr 1fr;
    }
}
.sol-monitor-col h3 {
    color: #fff;
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}
.sol-monitor-col p {
    color: #9ca3af;
    line-height: 1.7;
}
/* 合作伙伴部分 */
.vehicle-gallery {
    background-color: #f9fafb;
    padding: 3rem 0;
}
.vehicle-gallery .container {
    max-width: 1200px;
    margin: 0 auto;
}
.vg-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
    align-items: start;
}
.vg-item {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.15);
    background: #0b0b0b;
}
.vg-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.vg-i1 { grid-column: 1; grid-row: 1; height: 240px; }
.vg-i2 { grid-column: 1; grid-row: 2; height: 240px; }
.vg-i3 { grid-column: 2; grid-row: 1 / span 2; height: 500px; }
.vg-i4 { grid-column: 3; grid-row: 1; height: 240px; }
.vg-i5 { grid-column: 3; grid-row: 2; height: 240px; }
.vg-i7 { grid-column: 4; grid-row: 1 / span 2; height: 500px; }
.vg-i6 { grid-column: 2 / span 2; height: 200px; }
@media (max-width: 1024px) {
    .vg-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .vg-i3, .vg-i7 {
        grid-row: auto;
        height: 380px;
    }
    .vg-i6 { grid-column: 1 / span 2; }
}
@media (max-width: 640px) {
    .vg-grid {
        grid-template-columns: 1fr;
    }
    .vg-item { height: auto; }
    .vg-item img { height: auto; }
}
/* 合作伙伴部分 */
.sol-tabs {
    background-color: #f9fafb;
    padding: 2.5rem 0;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.tabs-row {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.tab-btn {
    background: #ffffff;
    color: #111827;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    padding: 0.6rem 1rem;
    cursor: pointer;
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
    min-width: 120px;
    font-weight: 600;
}
.tab-btn:hover {
    background: #e5e7eb;
}
.tab-btn.active {
    background: #2f2f2f;
    color: #fff;
    box-shadow: 0 6px 12px rgba(0,0,0,0.25);
}
.tab-panels {
    max-width: 1200px;
    margin: 0 auto;
}
.tab-panel {
    display: none;
    color: #e5e7eb;
}
.tab-panel.active {
    display: block;
}
.tab-panel h2 {
    color: #fff;
    font-size: 1.6rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 1rem;
}
.tab-panel h3 {
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}
.tab-panel p {
    color: #9ca3af;
    line-height: 1.7;
}
/* 合作伙伴部分 bus*/
.bus-list {
    display: grid;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.bus-item strong {
    color: #fff;
}
.bus-img-center {
    text-align: center;
    margin: 1.5rem 0;
}
.bus-img-center img {
    max-width: 900px;
    width: 100%;
    height: auto;
    border: 1px solid rgba(255,255,255,0.15);
}
.bus-img-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 1rem;
}
.bus-img-row figure { 
    margin: 0; 
    display: flex; 
    flex-direction: column; 
    gap: 0.5rem;
}
.bus-img-row figcaption {
    text-align: left;
    color: #9ca3af;
    margin-top: 0.5rem;
}
.caption-list {
    text-align: left;
    color: #d1d5db;
    margin: 0.5rem 0 0;
    padding-left: 1.25rem;
}
.caption-list li { 
    margin: 0.25rem 0; 
    list-style: disc; 
}
.caption-list li strong { color: #ffffff; }
.bus-img-row img {
    width: 100%;
    height: auto;
    object-fit: contain;
    object-position: center;
    background-color: transparent;
    border: 1px solid rgba(255,255,255,0.15);
}
 
.bus-img-row-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}
.bus-img-row-3 img {
    width: 100%;
    height: auto;
    object-fit: contain;
    object-position: center;
    background-color: transparent;
    border: 1px solid rgba(255,255,255,0.15);
}
@media (max-width: 768px) {
    .bus-img-row {
        grid-template-columns: 1fr;
    }
    .bus-img-row img {
        height: auto;
        object-fit: contain;
    }
    .bus-img-row-3 {
        grid-template-columns: 1fr;
    }
    .bus-img-row-3 img {
        height: auto;
        object-fit: contain;
    }
}
 
.bus-equipment-image {
    text-align: center;
    margin: 1rem 0 2rem;
}
.bus-equipment-image img {
    max-width: 900px;
    width: 100%;
    height: auto;
    display: inline-block;
    border: 1px solid rgba(255,255,255,0.15);
}
 
.bus-section-title {
    color: #ffffff;
}
 
.comparison-table {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto 2rem;
    border-collapse: collapse;
    background: #ffffff;
    color: #111827;
}
.comparison-table th, .comparison-table td {
    border: 1px solid rgba(0,0,0,0.2);
    padding: 12px 16px;
    vertical-align: top;
}
.comparison-table th {
    text-align: center;
    font-weight: 700;
}
 
.bus-features h4 {
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 0 0.75rem;
}
.bus-features-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
    align-items: stretch;
    margin-bottom: 1.5rem;
}
.feature-box {
    background: #ffffff;
    color: #111827;
    border: 1px solid rgba(0,0,0,0.2);
    border-radius: 6px;
    padding: 1rem;
    text-align: center;
    font-weight: 600;
    min-height: 64px;
    display: grid;
    place-items: center;
    transition: background-color 0.2s ease;
}
.feature-box:hover {
    background: #e5e7eb;
}
.feature-span2 { grid-column: span 2; }
.feature-span3 { grid-column: span 3; }
@media (max-width: 1024px) {
    .bus-features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .feature-span2, .feature-span3 {
        grid-column: span 2;
    }
}
/* 合作伙伴部分 */
.partners-section {
    padding: 100px 0;
    background-color: #f9fafb;
    border-top: 1px solid rgba(0, 102, 204, 0.1);
}


.partners-container {
    position: relative;
    padding: 0 60px;
}

.partners-carousel {
    position: relative;
    overflow: hidden;
    margin-bottom: 40px;
}

.carousel-wrapper {
    overflow: hidden;
    position: relative;
}

.partners-grid {
    display: flex;
    transition: transform 0.5s ease;
    gap: 20px;
    padding: 20px 0;
}

.partner-item {
    flex: 0 0 calc(16.666% - 17px);
    background: rgba(0, 0, 0, 0.5);
    border-radius: 10px;
    padding: 30px 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 102, 204, 0.1);
    min-height: 120px;
}

.partner-item:hover {
    transform: translateY(-5px);
    border-color: #0066cc;
    box-shadow: 0 10px 20px rgba(0, 102, 204, 0.2);
    background: rgba(0, 102, 204, 0.1);
}

.partner-logo {
    max-width: 100%;
    max-height: 60px;
    object-fit: contain;
    filter: brightness(0.9);
    transition: filter 0.3s ease;
}

.partner-item:hover .partner-logo {
    filter: brightness(1.1);
}

.partner-name {
    text-align: center;
    color: #666;
    font-size: 12px;
    margin-top: 8px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.partner-item:hover .partner-name {
    opacity: 1;
}

.carousel-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 102, 204, 0.8);
    color: white;
    border: none;
    width: 60px;
    height: 50px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 10;
}

.carousel-nav:hover {
    background: #0066cc;
    transform: translateY(-50%) scale(1.1);
}

.carousel-nav.prev-btn {
    left: 0;
}

.carousel-nav.next-btn {
    right: 0;
}

/* 分页导航 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 30px;
}

.page-btn {
    background: rgba(0, 102, 204, 0.2);
    color: #0066cc;
    border: 1px solid #0066cc;
    padding: 8px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.page-btn:hover {
    background: #0066cc;
    color: white;
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: rgba(0, 102, 204, 0.1);
}

.page-numbers {
    display: flex;
    gap: 10px;
}

.page-number {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 16px;
}

.page-number.active {
    background: #0066cc;
    color: white;
    font-weight: bold;
}

.page-number:hover:not(.active) {
    background: rgba(0, 102, 204, 0.3);
    color: #fff;
}

/* 合作伙伴logo查看器 */
.partner-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.partner-modal-overlay.active {
    display: flex;
    opacity: 1;
}

.partner-modal-content {
    position: relative;
    max-width: 80%;
    max-height: 80%;
    width: auto;
    height: auto;
    text-align: center;
}

.partner-modal-image {
    max-width: 100%;
    max-height: 70vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.5);
}

.partner-name {
    position: absolute;
    bottom: -50px;
    left: 0;
    width: 100%;
    text-align: center;
    color: white;
    font-size: 20px;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
}

.partner-modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    backdrop-filter: blur(5px);
}

.partner-modal-nav:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.partner-prev-btn {
    left: -80px;
}

.partner-next-btn {
    right: -80px;
}

.partner-close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: white;
    font-size: 36px;
    cursor: pointer;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}

.partner-close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* 全屏图片查看器 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    width: auto;
    height: auto;
}

.modal-image {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.5);
}

.modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    backdrop-filter: blur(5px);
}

.modal-nav:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.prev-btn {
    left: -80px;
}

.next-btn {
    right: -80px;
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: white;
    font-size: 36px;
    cursor: pointer;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.image-indicator {
    position: absolute;
    bottom: -60px;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    gap: 15px;
}

.indicator-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: all 0.3s;
}

.indicator-dot.active {
    background: white;
    transform: scale(1.2);
}

/* 页脚 */
.dark-footer {
    background-color: #000;
    padding: 60px 0;
    border-top: 1px solid rgba(0, 102, 204, 0.1);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.footer-logo img {
    max-height: 80px;
    margin-bottom: 20px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.footer-links a {
    text-decoration: none;
    color: #fff;
    font-weight: bold;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #0066cc;
}

.footer-copyright {
    color: #999;
    font-size: 0.9rem;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .partner-item {
        flex: 0 0 calc(20% - 16px);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: rgba(0, 0, 0, 0.95);
        padding: 20px;
        gap: 15px;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
    
    .solutions-hero {
        height: 50vh;
    }
    
    .modal-nav {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
    
    .close-btn {
        top: 20px;
        right: 20px;
        font-size: 30px;
    }
    
    .partner-item {
        flex: 0 0 calc(25% - 15px);
    }
    
    .partners-container {
        padding: 0 50px;
    }
    
    .contact-popup {
        right: 80px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .solution-card {
        min-width: 100%;
    }
    
    .detail-item {
        padding: 20px;
    }
    
    .partner-item {
        flex: 0 0 calc(33.333% - 13.33px);
    }
    
    .partners-container {
        padding: 0 40px;
    }
    
    .fixed-sidebar {
        right: 10px;
        padding: 10px 8px;
    }
    
    .sidebar-icon {
        width: 45px;
        height: 45px;
    }
    
    .sidebar-icon i {
        font-size: 18px;
    }
    
    .contact-popup {
        right: 60px;
        min-width: 250px;
    }
    
    .qrcode-img {
        width: 180px;
        height: 180px;
    }
    
    .pagination {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .page-btn {
        padding: 6px 15px;
        font-size: 13px;
    }
    
    .page-number {
        width: 35px;
        height: 35px;
        font-size: 14px;
    }
}

/* Atlas section */
.atlas-section {
    background: #fff;
    color: #111827;
    padding: 60px 0;
}
.atlas-header {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 20px;
}
.atlas-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}
@media (min-width: 768px) {
    .atlas-grid {
        grid-template-columns: 1fr 1fr;
    }
}
.atlas-item {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.atlas-image {
    width: 100%;
    height: auto;
    display: block;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
}
.atlas-caption {
    font-size: 1rem;
    color: #374151;
}

/* Image count badge on cards */
.img-count-badge {
    position: absolute;
    right: 10px;
    bottom: 10px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #3f3f46;
    color: #fff;
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 6px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}
.img-count-badge i {
    font-size: 12px;
}