:root {
    --industrial-gray: #1F2937;
    --industrial-gray-dark: #111827;
    --industrial-gray-light: #374151;
    --industrial-yellow: #F59E0B;
    --industrial-orange: #EA580C;
    --industrial-silver: #9CA3AF;
    --industrial-bg: #0B0F14;
    --text-dark: #0F172A;
    --text-light: #F8FAFC;
    --text-muted: #6B7280;
    --border-color: #273240;
    --surface: #FFFFFF;
    --surface-muted: #F3F4F6;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
    color: var(--text-dark);
    background-color: var(--surface-muted);
    line-height: 1.7;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--industrial-yellow);
}

h1, h2, h3, h4, h5 {
    font-family: "Smiley Sans", "Deyi Hei", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
    margin: 0 0 12px;
    color: var(--industrial-gray-dark);
}

p {
    margin: 0 0 16px;
    color: var(--text-dark);
}

.container {
    width: min(90%, 1280px);
    margin: 0 auto;
}

.section {
    padding: 72px 0;
}

.section--dark {
    background: var(--industrial-gray-dark);
    color: var(--text-light);
}

.section--dark h2,
.section--dark h3,
.section--dark p,
.section--dark li {
    color: var(--text-light);
}

.section-header {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 36px;
}

.section-title {
    font-size: 32px;
    position: relative;
    padding-left: 16px;
}

.section-title::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 28px;
    background: var(--industrial-yellow);
}

.section-subtitle {
    color: var(--text-muted);
    max-width: 720px;
}

.eyebrow {
    font-size: 13px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--industrial-yellow);
    font-weight: 600;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
}

.card {
    background: var(--surface);
    border: 1px solid #E5E7EB;
    padding: 24px;
    border-radius: 10px;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
}

.card--dark {
    background: #151C27;
    border-color: #2F3A4A;
    box-shadow: none;
}

.card--dark p,
.card--dark h3,
.card--dark li {
    color: var(--text-light);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(245, 158, 11, 0.15);
    color: var(--industrial-yellow);
    font-size: 12px;
    font-weight: 600;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 22px;
    border-radius: 6px;
    font-weight: 600;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    cursor: pointer;
}

.btn-primary {
    background: var(--industrial-yellow);
    color: #1F2937;
}

.btn-primary:hover {
    background: #FBBF24;
    color: #111827;
}

.btn-outline {
    border-color: var(--industrial-yellow);
    color: var(--industrial-yellow);
    background: transparent;
}

.btn-outline:hover {
    background: rgba(245, 158, 11, 0.15);
}

.btn-secondary {
    background: var(--industrial-gray-dark);
    color: var(--text-light);
    border-color: var(--industrial-gray-light);
}

.btn-secondary:hover {
    background: #0B0F14;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 999;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.25);
}

.top-bar {
    background: var(--industrial-bg);
    color: var(--industrial-silver);
    font-size: 13px;
}

.top-bar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 0;
    gap: 16px;
}

.top-bar a {
    color: var(--industrial-silver);
}

.top-bar a:hover {
    color: var(--industrial-yellow);
}

.brand-bar {
    background: var(--industrial-gray);
    border-bottom: 1px solid var(--border-color);
}

.brand-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 0;
    gap: 20px;
}

.logo {
    font-size: 26px;
    font-weight: 700;
    color: var(--industrial-yellow);
}

.logo-sub {
    font-size: 12px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--industrial-silver);
}

.brand-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.main-nav {
    background: var(--industrial-gray-dark);
}

.main-nav .container {
    display: flex;
    justify-content: center;
}

.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 26px;
    align-items: center;
    justify-content: center;
}

.nav-item {
    position: relative;
}

.nav-item > a {
    display: block;
    padding: 14px 6px;
    color: #E5E7EB;
    font-weight: 500;
    border-bottom: 3px solid transparent;
}

.nav-item > a.is-active {
    color: var(--industrial-yellow);
    border-color: var(--industrial-yellow);
}

.nav-item.has-dropdown > a::after {
    content: "▾";
    margin-left: 6px;
    font-size: 11px;
    color: var(--industrial-silver);
}

.dropdown-menu {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 100%;
    background: var(--industrial-gray);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 8px 0;
    min-width: 200px;
    box-shadow: 0 16px 30px rgba(0, 0, 0, 0.25);
    display: none;
    z-index: 10;
}

.dropdown-menu a {
    display: block;
    padding: 10px 16px;
    color: #E5E7EB;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    white-space: nowrap;
}

.dropdown-menu a:last-child {
    border-bottom: none;
}

.nav-item:hover .dropdown-menu,
.nav-item:focus-within .dropdown-menu {
    display: block;
}

.hero {
    position: relative;
    min-height: 580px;
    display: flex;
    align-items: center;
    color: var(--text-light);
    background-size: cover;
    background-position: center;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(17, 24, 39, 0.92), rgba(17, 24, 39, 0.6));
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
}

.hero-title {
    font-size: 46px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.hero-subtitle {
    font-size: 18px;
    color: #E5E7EB;
}

.hero-actions {
    display: flex;
    gap: 14px;
    margin-top: 24px;
    flex-wrap: wrap;
}

.hero-highlights {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-top: 32px;
}

.hero-highlight {
    padding: 14px 16px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    background: rgba(15, 23, 42, 0.35);
}

.hero-highlight span {
    display: block;
    color: var(--industrial-yellow);
    font-weight: 600;
}

.split {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
    align-items: center;
}

.image-frame {
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #E5E7EB;
    box-shadow: 0 16px 30px rgba(15, 23, 42, 0.12);
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 16px;
}

.feature-item {
    display: flex;
    gap: 14px;
    padding: 16px;
    border-radius: 8px;
    background: #F8FAFC;
    border: 1px solid #E5E7EB;
}

.feature-item span {
    font-weight: 600;
    color: var(--industrial-gray-dark);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.stat-card {
    padding: 20px;
    border-radius: 10px;
    background: #111827;
    color: var(--text-light);
    border: 1px solid #2F3A4A;
}

.stat-card strong {
    font-size: 24px;
    color: var(--industrial-yellow);
    display: block;
}

.product-card {
    background: var(--surface);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #E5E7EB;
    display: flex;
    flex-direction: column;
    box-shadow: 0 16px 28px rgba(15, 23, 42, 0.08);
}

.product-card img {
    height: 220px;
    object-fit: cover;
}

.product-card-body {
    padding: 20px;
}

.product-card h3 {
    margin-bottom: 10px;
}

.product-meta {
    color: var(--text-muted);
    font-size: 14px;
}

.spec-list {
    list-style: none;
    padding: 0;
    margin: 16px 0 0;
    display: grid;
    gap: 10px;
}

.spec-list li {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px dashed #D1D5DB;
    padding-bottom: 8px;
    font-size: 14px;
}

.map-panel {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    min-height: 360px;
    border: 1px solid #E5E7EB;
}

.map-panel img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.map-marker {
    position: absolute;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--industrial-orange);
    box-shadow: 0 0 0 4px rgba(234, 88, 12, 0.3);
}

.scroll-strip {
    display: flex;
    gap: 18px;
    overflow-x: auto;
    padding-bottom: 10px;
}

.scroll-strip::-webkit-scrollbar {
    height: 6px;
}

.scroll-strip::-webkit-scrollbar-thumb {
    background: #CBD5F5;
    border-radius: 999px;
}

.scroll-card {
    min-width: 220px;
    background: var(--surface);
    border-radius: 10px;
    border: 1px solid #E5E7EB;
    padding: 16px;
}

.page-hero {
    position: relative;
    padding: 72px 0 60px;
    background-size: cover;
    background-position: center;
    color: var(--text-light);
}

.page-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(17, 24, 39, 0.9), rgba(17, 24, 39, 0.5));
}

.page-hero-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
}

.page-hero h1 {
    color: var(--text-light);
    font-size: 36px;
}

.page-layout {
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 32px;
    margin-top: 40px;
    margin-bottom: 80px;
}

.sidebar-nav {
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid #E5E7EB;
    overflow: hidden;
}

.sidebar-nav a {
    display: block;
    padding: 16px 18px;
    border-bottom: 1px solid #E5E7EB;
    color: var(--text-dark);
    font-weight: 500;
}

.sidebar-nav a.is-active {
    background: var(--industrial-gray);
    color: var(--industrial-yellow);
}

.content-panel {
    background: var(--surface);
    border-radius: 14px;
    border: 1px solid #E5E7EB;
    padding: 32px;
}

.content-panel img {
    border-radius: 12px;
    margin-bottom: 20px;
}

.highlight-bar {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin: 20px 0;
}

.highlight-item {
    padding: 10px 16px;
    border-radius: 999px;
    background: rgba(31, 41, 55, 0.08);
    font-size: 13px;
    font-weight: 600;
}

.timeline {
    display: grid;
    gap: 24px;
    position: relative;
    padding-left: 20px;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--industrial-yellow);
}

.timeline-item {
    position: relative;
    padding-left: 20px;
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: -3px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--industrial-yellow);
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
}

.data-table th,
.data-table td {
    border: 1px solid #E5E7EB;
    padding: 12px;
    text-align: left;
}

.data-table th {
    background: #F8FAFC;
    width: 30%;
    color: var(--industrial-gray-dark);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.news-card {
    background: var(--surface);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #E5E7EB;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
    padding: 0;
    display: grid;
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 16px;
}

.news-card img {
    height: 100%;
    object-fit: cover;
}

.news-card-body {
    padding: 16px 18px;
}

.news-meta {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.article {
    display: grid;
    gap: 20px;
}

.article h2 {
    margin-top: 12px;
}

.article-meta {
    display: flex;
    gap: 16px;
    color: var(--text-muted);
    font-size: 13px;
    border-bottom: 1px solid #E5E7EB;
    padding-bottom: 12px;
}

.form {
    display: grid;
    gap: 16px;
}

.form-group {
    display: grid;
    gap: 8px;
}

.input,
.textarea,
.select {
    width: 100%;
    padding: 12px 14px;
    border-radius: 8px;
    border: 1px solid #D1D5DB;
    font-size: 14px;
    font-family: inherit;
}

.textarea {
    min-height: 140px;
    resize: vertical;
}

.site-footer {
    background: var(--industrial-gray-dark);
    color: var(--industrial-silver);
    padding: 56px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
}

.footer-grid h4 {
    color: var(--industrial-yellow);
}

.footer-grid ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 8px;
}

.footer-grid a {
    color: var(--industrial-silver);
}

.footer-bottom {
    margin-top: 32px;
    border-top: 1px solid #1F2937;
    padding-top: 18px;
    text-align: center;
    font-size: 13px;
    color: var(--industrial-silver);
}

@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .stats-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .hero-highlights {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .page-layout {
        grid-template-columns: 1fr;
    }

    .sidebar-nav {
        position: static;
    }

    .news-card {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .brand-inner,
    .top-bar-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-list {
        flex-wrap: wrap;
        gap: 16px;
    }

    .hero {
        min-height: 520px;
    }

    .hero-title {
        font-size: 36px;
    }

    .split,
    .grid-3,
    .grid-2 {
        grid-template-columns: 1fr;
    }

    .gallery-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

@media (max-width: 560px) {
    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .hero-highlights {
        grid-template-columns: 1fr;
    }
}