:root {
    --primary: #003366;
    --primary-light: #0a4a80;
    --accent: #FF6600;
    --accent-light: #ff8533;
    --bg-light: #F8FAFC;
    --bg-white: #FFFFFF;
    --text-main: #1E293B;
    --text-muted: #64748B;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 15px 45px rgba(0, 0, 0, 0.10);
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
    color: var(--text-main);
    line-height: 1.7;
    background: var(--bg-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== 统一头部 ========== */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition);
}
header.scrolled {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.10);
}
.nav-container {
    max-width: 1240px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 24px;
}
.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.5px;
    white-space: nowrap;
}
.logo i {
    color: var(--accent);
    font-size: 22px;
}
.logo span {
    color: var(--accent);
}
.nav-menu {
    display: flex;
    list-style: none;
    gap: 4px;
}
.nav-menu li {
    position: relative;
}
.nav-menu a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    font-size: 14.5px;
    padding: 8px 16px;
    border-radius: 6px;
    transition: var(--transition);
    display: block;
    white-space: nowrap;
}
.nav-menu a:hover {
    color: var(--primary);
    background: #f1f5f9;
}
.nav-menu a.active {
    color: var(--primary);
    font-weight: 700;
    background: #eef4fb;
}
.mobile-btn {
    display: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--primary);
    padding: 8px;
    border-radius: 6px;
    transition: var(--transition);
    background: none;
    border: none;
}
.mobile-btn:hover {
    background: #f1f5f9;
}

/* ========== 面包屑导航条 ========== */
.breadcrumb-bar {
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 10px 24px;
    margin-top: 66px;
    position: sticky;
    top: 64px;
    z-index: 99;
}
.breadcrumb-inner {
    max-width: 1240px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13.5px;
    color: var(--text-muted);
    flex-wrap: wrap;
}
.breadcrumb-inner a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}
.breadcrumb-inner a:hover {
    color: var(--primary);
}
.breadcrumb-inner .sep {
    color: #cbd5e1;
    font-size: 11px;
}
.breadcrumb-inner .current {
    color: var(--primary);
    font-weight: 600;
}

/* ========== Hero 头部区域 ========== */
.case-hero {
    background: linear-gradient(160deg, #001a33 0%, #002b55 40%, #003d6b 100%);
    color: #fff;
    padding: 50px 24px 56px;
    position: relative;
    overflow: hidden;
}
.case-hero::before {
    content: '';
    position: absolute;
    top: -60px;
    right: -80px;
    width: 320px;
    height: 320px;
    background: radial-gradient(circle, rgba(255, 102, 0, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.case-hero::after {
    content: '';
    position: absolute;
    bottom: -100px;
    left: -60px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.03) 0%, transparent 65%);
    border-radius: 50%;
    pointer-events: none;
}
.hero-inner {
    max-width: 1240px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 36px;
    align-items: center;
    justify-content: space-between;
}
.hero-text {
    flex: 1;
    min-width: 280px;
}
.hero-badge {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}
.hero-text h1 {
    font-size: clamp(26px, 3.5vw, 38px);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 12px;
    letter-spacing: -0.3px;
}
.hero-text .hero-subtitle {
    font-size: 15px;
    opacity: 0.85;
    line-height: 1.6;
    max-width: 520px;
}
.hero-meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    margin-top: 20px;
    font-size: 13.5px;
    opacity: 0.9;
}
.hero-meta-row span {
    display: flex;
    align-items: center;
    gap: 6px;
}
.hero-meta-row i {
    color: var(--accent);
    font-size: 14px;
}
.hero-image-card {
    flex: 0 0 380px;
    max-width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
    aspect-ratio: 4/3;
    background: #1a1a2e;
}
.hero-image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ========== 主体内容区 ========== */
.main-content {
    max-width: 1240px;
    margin: 0 auto;
    padding: 40px 24px 60px;
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 32px;
}

/* 左侧文章区 */
.article-area {
    min-width: 0;
}
.article-section {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 32px 28px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.article-section h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 2px solid #eef2f8;
    display: flex;
    align-items: center;
    gap: 10px;
}
.article-section h2 i {
    color: var(--accent);
    font-size: 20px;
}
.article-section h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-main);
    margin: 18px 0 8px;
}
.article-section p {
    font-size: 15px;
    color: #475569;
    line-height: 1.8;
    margin-bottom: 12px;
}
.article-section ul {
    list-style: none;
    padding: 0;
}
.article-section ul li {
    position: relative;
    padding-left: 22px;
    margin-bottom: 8px;
    font-size: 14.5px;
    color: #475569;
    line-height: 1.7;
}
.article-section ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 2px;
    transform: rotate(45deg);
}

/* 参数表格 */
.param-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    margin-top: 12px;
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.param-table th,
.param-table td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid #eef2f8;
}
.param-table th {
    background: #f8fafc;
    color: var(--primary);
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.3px;
    white-space: nowrap;
}
.param-table td {
    color: #475569;
}
.param-table tr:last-child td {
    border-bottom: none;
}

/* 数据亮点卡片 */
.highlight-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 14px;
    margin-top: 16px;
}
.highlight-card {
    background: linear-gradient(135deg, #f8fafc 0%, #eef4fb 100%);
    border-radius: var(--radius-sm);
    padding: 18px 14px;
    text-align: center;
    border: 1px solid #e2e8f0;
}
.highlight-card .value {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -1px;
}
.highlight-card .value span {
    font-size: 16px;
    font-weight: 500;
}
.highlight-card .label {
    font-size: 12.5px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* 现场图集 */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin-top: 12px;
}
.gallery-item {
    border-radius: var(--radius-sm);
    overflow: hidden;
    aspect-ratio: 4/3;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}
.gallery-item:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-lg);
}
.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.gallery-item .overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    color: #fff;
    font-size: 24px;
}
.gallery-item:hover .overlay {
    opacity: 1;
}

/* 客户评价 */
.testimonial-block {
    background: #fefcf8;
    border-left: 4px solid var(--accent);
    padding: 20px 24px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-top: 16px;
    font-style: italic;
    color: #475569;
    font-size: 14.5px;
    line-height: 1.8;
}
.testimonial-block .author {
    font-style: normal;
    font-weight: 700;
    color: var(--primary);
    margin-top: 10px;
    font-size: 13px;
}
.testimonial-block .author span {
    font-weight: 400;
    color: var(--text-muted);
}

/* 右侧边栏 */
.sidebar {
    min-width: 0;
}
.sidebar-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 24px 20px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    position: sticky;
    top: 140px;
}
.sidebar-card h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid #eef2f8;
}
.sidebar-card .info-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px dashed #eef2f8;
    font-size: 14px;
}
.sidebar-card .info-row .label {
    color: var(--text-muted);
    flex-shrink: 0;
}
.sidebar-card .info-row .value {
    font-weight: 600;
    text-align: right;
    color: var(--text-main);
}
.btn-cta {
    display: block;
    width: 100%;
    padding: 13px;
    text-align: center;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    margin-top: 16px;
    letter-spacing: 0.3px;
}
.btn-cta:hover {
    background: #e55a00;
    box-shadow: 0 6px 20px rgba(255, 102, 0, 0.3);
    transform: translateY(-2px);
}
.btn-cta-outline {
    display: block;
    width: 100%;
    padding: 12px;
    text-align: center;
    background: #fff;
    color: var(--primary);
    border: 2px solid var(--primary);
    border-radius: 8px;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    margin-top: 10px;
}
.btn-cta-outline:hover {
    background: #f0f6fd;
}
.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}
.tech-tag {
    background: #eef4fb;
    color: var(--primary);
    padding: 5px 12px;
    border-radius: 16px;
    font-size: 12.5px;
    font-weight: 500;
}

/* 相关案例 */
.related-section {
    max-width: 1240px;
    margin: 0 auto;
    padding: 10px 24px 50px;
}
.related-section h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 20px;
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.related-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: block;
}
.related-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.related-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}
.related-card .card-body {
    padding: 16px;
}
.related-card .card-body h4 {
    font-size: 15px;
    color: var(--primary);
    margin-bottom: 6px;
}
.related-card .card-body p {
    font-size: 13px;
    color: var(--text-muted);
}

/* ========== 统一底部 ========== */
footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 60px 24px 30px;
    margin-top: 40px;
}
.footer-grid {
    max-width: 1240px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 36px;
}
.footer-grid h4 {
    color: #fff;
    margin-bottom: 18px;
    font-size: 16px;
}
.footer-grid p,
.footer-grid li {
    font-size: 13.5px;
    line-height: 2;
}
.footer-grid ul {
    list-style: none;
}
.footer-bottom {
    text-align: center;
    margin-top: 40px;
    padding-top: 18px;
    border-top: 1px solid #334155;
    font-size: 12.5px;
    color: #64748b;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .main-content {
grid-template-columns: 1fr;
gap: 24px;
    }
    .sidebar {
order: -1;
    }
    .sidebar-card {
position: static;
display: grid;
grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
gap: 12px;
align-items: start;
    }
    .sidebar-card h4 {
grid-column: 1/-1;
margin-bottom: 0;
    }
    .sidebar-card .info-row {
border-bottom: none;
flex-direction: column;
gap: 2px;
    }
    .sidebar-card .info-row .value {
text-align: left;
    }
    .btn-cta,
    .btn-cta-outline {
grid-column: 1/-1;
    }
    .hero-image-card {
flex: 0 0 280px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
display: none;
position: absolute;
top: 62px;
left: 0;
width: 100%;
background: #fff;
flex-direction: column;
padding: 16px 20px;
box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
gap: 0;
    }
    .nav-menu.active {
display: flex;
    }
    .nav-menu li {
width: 100%;
    }
    .nav-menu a {
padding: 10px 8px;
border-bottom: 1px solid #f1f5f9;
border-radius: 0;
    }
    .mobile-btn {
display: block;
    }
    .breadcrumb-bar {
margin-top: 58px;
top: 56px;
    }
    .case-hero {
padding: 32px 16px 40px;
    }
    .hero-inner {
flex-direction: column;
gap: 20px;
    }
    .hero-image-card {
flex: 0 0 auto;
width: 100%;
aspect-ratio: 16/10;
    }
    .hero-text h1 {
font-size: 24px;
    }
    .main-content {
padding: 24px 16px 40px;
    }
    .article-section {
padding: 20px 16px;
    }
    .param-table {
font-size: 12px;
    }
    .param-table th,
    .param-table td {
padding: 8px 10px;
    }
    .highlight-cards {
grid-template-columns: repeat(2, 1fr);
    }
    .gallery-grid {
grid-template-columns: repeat(2, 1fr);
    }
    .related-grid {
grid-template-columns: 1fr 1fr;
    }
    .sidebar-card {
display: block;
    }
}
@media (max-width: 480px) {
    .hero-meta-row {
flex-direction: column;
gap: 8px;
    }
    .related-grid {
grid-template-columns: 1fr;
    }
    .gallery-grid {
grid-template-columns: 1fr 1fr;
gap: 8px;
    }
    .highlight-cards {
grid-template-columns: 1fr 1fr;
gap: 8px;
    }
    .highlight-card .value {
font-size: 22px;
    }
    .footer-grid {
grid-template-columns: 1fr;
gap: 24px;
    }
    .param-table {
display: block;
overflow-x: auto;
-webkit-overflow-scrolling: touch;
    }
}