/* roulang page: index */
:root {
      --color-primary: #1A1D20;
      --color-primary-light: #2C3E50;
      --color-accent: #E63946;
      --color-accent-hover: #C92A37;
      --color-dark-bg: #14171A;
      --color-card-bg: #FFFFFF;
      --color-light-bg: #F8F9FA;
      --color-subtle-bg: #EEF2F6;
      --color-border: #E2E8F0;
      --color-border-dark: #2A2E33;
      --color-text-main: #1E293B;
      --color-text-muted: #64748B;
      --color-text-light: #94A3B8;
      --color-text-white: #FFFFFF;
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --radius-sm: 4px;
      --radius-md: 6px;
      --radius-lg: 8px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
      --shadow-lg: 0 12px 28px rgba(0,0,0,0.12);
      --transition: all 0.25s ease-in-out;
      --max-width: 1240px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-stack);
      color: var(--color-text-main);
      background-color: var(--color-light-bg);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

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

    button, input, select, textarea {
      font-family: inherit;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: #ffffff;
      box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    }

    .top-bar {
      background: var(--color-primary);
      color: var(--color-text-light);
      font-size: 0.8125rem;
      padding: 6px 0;
      border-bottom: 1px solid var(--color-border-dark);
    }

    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .top-bar-tags {
      display: flex;
      gap: 16px;
    }

    .top-bar-tags span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .top-bar-contact {
      display: flex;
      gap: 20px;
    }

    .main-nav {
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .nav-logo {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .logo-badge {
      background: var(--color-accent);
      color: #fff;
      font-weight: 900;
      font-size: 1.25rem;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      letter-spacing: 1px;
    }

    .logo-text {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--color-primary);
      letter-spacing: -0.5px;
    }

    .logo-sub {
      font-size: 0.75rem;
      color: var(--color-text-muted);
      font-weight: 500;
      display: block;
      margin-top: -2px;
    }

    .nav-menu {
      display: flex;
      list-style: none;
      gap: 28px;
      align-items: center;
    }

    .nav-link {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--color-primary-light);
      padding: 8px 0;
      position: relative;
    }

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

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-accent);
      transition: var(--transition);
    }

    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }

    .nav-cta-btn {
      background: var(--color-accent);
      color: #fff;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9rem;
      border: 1px solid var(--color-accent);
      box-shadow: var(--shadow-sm);
    }

    .nav-cta-btn:hover {
      background: var(--color-accent-hover);
      transform: translateY(-1px);
    }

    .nav-toggle {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .nav-toggle-icon {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--color-primary);
      position: relative;
    }

    .nav-toggle-icon::before, .nav-toggle-icon::after {
      content: '';
      position: absolute;
      width: 24px;
      height: 2px;
      background: var(--color-primary);
      left: 0;
    }

    .nav-toggle-icon::before { top: -6px; }
    .nav-toggle-icon::after { bottom: -6px; }

    /* 通用板块排版 */
    .section-padding {
      padding: 84px 0;
    }

    .section-header {
      margin-bottom: 48px;
      max-width: 820px;
    }

    .section-header.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--color-accent);
      text-transform: uppercase;
      letter-spacing: 1.5px;
      margin-bottom: 10px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--color-primary);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--color-text-muted);
      line-height: 1.75;
    }

    /* 1. Hero 板块：视差轮播与工业质感 */
    .hero-section {
      background: linear-gradient(rgba(20, 23, 26, 0.88), rgba(20, 23, 26, 0.88)), url('/assets/images/9eb2bed2d617ec39.webp') center/cover no-repeat;
      color: var(--color-text-white);
      padding: 100px 0 80px;
      position: relative;
      border-bottom: 3px solid var(--color-accent);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 50px;
      align-items: center;
    }

    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: #FFFFFF;
    }

    .hero-h1 span {
      color: var(--color-accent);
    }

    .hero-subtext {
      font-size: 1.05rem;
      color: var(--color-text-light);
      margin-bottom: 32px;
      line-height: 1.8;
      max-width: 640px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .btn-primary {
      background: var(--color-accent);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 1rem;
      border: 1px solid var(--color-accent);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-primary:hover {
      background: var(--color-accent-hover);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      color: #fff;
      padding: 14px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 1rem;
      border: 1px solid rgba(255, 255, 255, 0.3);
    }

    .btn-outline:hover {
      border-color: #fff;
      background: rgba(255, 255, 255, 0.08);
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      border-top: 1px solid var(--color-border-dark);
      padding-top: 24px;
    }

    .metric-value {
      font-size: 1.6rem;
      font-weight: 800;
      color: #fff;
      line-height: 1;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.8125rem;
      color: var(--color-text-light);
    }

    .hero-card {
      background: rgba(44, 62, 80, 0.7);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.12);
      border-radius: var(--radius-md);
      padding: 30px;
    }

    .hero-card-header {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding-bottom: 12px;
    }

    .hero-card-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .hero-card-item {
      display: flex;
      justify-content: space-between;
      font-size: 0.9rem;
    }

    .hero-card-item .key {
      color: var(--color-text-light);
    }

    .hero-card-item .val {
      color: #fff;
      font-weight: 600;
    }

    /* 2. 工艺制造介绍区（#about） */
    .about-section {
      background: #FFFFFF;
    }

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

    .about-image-wrap {
      position: relative;
    }

    .about-image-wrap img {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      width: 100%;
      height: 420px;
      object-fit: cover;
    }

    .about-cert-badge {
      position: absolute;
      bottom: -20px;
      right: 20px;
      background: var(--color-primary);
      color: #fff;
      padding: 18px 24px;
      border-radius: var(--radius-sm);
      border-left: 4px solid var(--color-accent);
      box-shadow: var(--shadow-lg);
    }

    .about-cert-badge strong {
      display: block;
      font-size: 1.1rem;
      color: #fff;
    }

    .about-cert-badge span {
      font-size: 0.8125rem;
      color: var(--color-text-light);
    }

    .about-content-list {
      display: flex;
      flex-direction: column;
      gap: 18px;
      margin-top: 24px;
    }

    .about-feature-box {
      border-left: 3px solid var(--color-border);
      padding-left: 18px;
      transition: var(--transition);
    }

    .about-feature-box:hover {
      border-color: var(--color-accent);
    }

    .about-feature-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 4px;
    }

    .about-feature-desc {
      font-size: 0.9rem;
      color: var(--color-text-muted);
    }

    /* 3. 六大制造优势区（#advantages） */
    .advantages-section {
      background: var(--color-subtle-bg);
    }

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

    .advantage-card {
      background: #FFFFFF;
      padding: 32px 26px;
      border-radius: var(--radius-md);
      border: 1px solid var(--color-border);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--color-accent);
    }

    .advantage-num {
      font-size: 1.75rem;
      font-weight: 900;
      color: var(--color-accent);
      opacity: 0.9;
      margin-bottom: 12px;
      line-height: 1;
    }

    .advantage-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 10px;
    }

    .advantage-desc {
      font-size: 0.9rem;
      color: var(--color-text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
    }

    .advantage-spec {
      background: var(--color-light-bg);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--color-primary-light);
      display: flex;
      justify-content: space-between;
    }

    /* 4. 热门品类矩阵（#products） */
    .products-section {
      background: #FFFFFF;
    }

    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .product-card {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .product-card:hover {
      box-shadow: var(--shadow-md);
      border-color: #CBD5E1;
    }

    .product-img-wrap {
      height: 220px;
      overflow: hidden;
      position: relative;
    }

    .product-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .product-card:hover .product-img-wrap img {
      transform: scale(1.05);
    }

    .product-badge {
      position: absolute;
      top: 14px;
      left: 14px;
      background: rgba(26, 29, 32, 0.85);
      color: #fff;
      font-size: 0.75rem;
      padding: 4px 8px;
      border-radius: var(--radius-sm);
      font-weight: 600;
    }

    .product-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .product-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 8px;
    }

    .product-desc {
      font-size: 0.9rem;
      color: var(--color-text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }

    .product-specs {
      margin-top: auto;
      border-top: 1px solid var(--color-border);
      padding-top: 16px;
      margin-bottom: 18px;
    }

    .spec-row {
      display: flex;
      justify-content: space-between;
      font-size: 0.8125rem;
      margin-bottom: 6px;
    }

    .spec-label {
      color: var(--color-text-muted);
    }

    .spec-value {
      font-weight: 600;
      color: var(--color-primary);
    }

    .btn-card-action {
      background: var(--color-light-bg);
      color: var(--color-primary);
      text-align: center;
      padding: 10px;
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      font-weight: 600;
      border: 1px solid var(--color-border);
    }

    .btn-card-action:hover {
      background: var(--color-accent);
      color: #fff;
      border-color: var(--color-accent);
    }

    /* 5. 车规级检测与精益装配区（#quality） */
    .quality-section {
      background: var(--color-dark-bg);
      color: #FFFFFF;
      position: relative;
    }

    .quality-section .section-title {
      color: #FFFFFF;
    }

    .quality-section .section-desc {
      color: var(--color-text-light);
    }

    .quality-steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .quality-step-box {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid var(--color-border-dark);
      padding: 28px 20px;
      border-radius: var(--radius-md);
      position: relative;
    }

    .quality-step-index {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--color-accent);
      margin-bottom: 12px;
    }

    .quality-step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #FFFFFF;
    }

    .quality-step-desc {
      font-size: 0.875rem;
      color: var(--color-text-light);
      line-height: 1.65;
    }

    /* 6. 主机厂配套与应用案例区（#cases） */
    .cases-section {
      background: var(--color-subtle-bg);
    }

    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--color-border);
    }

    .case-img-wrap {
      height: 200px;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-info {
      padding: 24px;
    }

    .case-field-tag {
      font-size: 0.75rem;
      color: var(--color-accent);
      font-weight: 700;
      margin-bottom: 6px;
    }

    .case-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 10px;
    }

    .case-desc {
      font-size: 0.875rem;
      color: var(--color-text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .case-metrics-row {
      display: flex;
      justify-content: space-between;
      background: var(--color-light-bg);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      font-size: 0.8125rem;
    }

    /* 7. 供应链协同伙伴故事区（#stories） */
    .stories-section {
      background: #FFFFFF;
    }

    .story-card-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      background: var(--color-light-bg);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 40px;
    }

    .story-content h3 {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--color-primary);
      margin-bottom: 16px;
      line-height: 1.35;
    }

    .story-content p {
      font-size: 0.95rem;
      color: var(--color-text-muted);
      margin-bottom: 24px;
      line-height: 1.7;
    }

    .story-stats {
      display: flex;
      gap: 30px;
    }

    .story-stat-item strong {
      font-size: 1.5rem;
      color: var(--color-accent);
      display: block;
    }

    .story-stat-item span {
      font-size: 0.8125rem;
      color: var(--color-text-muted);
    }

    .story-visual-wrap img {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      width: 100%;
      height: 320px;
      object-fit: cover;
    }

    /* 8. 产能与全球交付关键数据（#stats） */
    .stats-section {
      background: var(--color-primary);
      color: #FFFFFF;
      padding: 60px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }

    .stat-number {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--color-accent);
      margin-bottom: 6px;
      line-height: 1;
    }

    .stat-title {
      font-size: 1rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 4px;
    }

    .stat-detail {
      font-size: 0.8125rem;
      color: var(--color-text-light);
    }

    /* 9. 采购工程师与车企质检评价区（#reviews） */
    .reviews-section {
      background: var(--color-subtle-bg);
    }

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

    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-stars {
      color: #F59E0B;
      font-size: 1rem;
      letter-spacing: 2px;
      margin-bottom: 12px;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--color-text-main);
      line-height: 1.65;
      margin-bottom: 20px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--color-border);
      padding-top: 14px;
    }

    .review-avatar-text {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--color-subtle-bg);
      color: var(--color-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .review-name {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--color-primary);
    }

    .review-role {
      font-size: 0.8rem;
      color: var(--color-text-muted);
    }

    /* 10. 前沿行业资讯内嵌摘要区（#news） */
    .news-section {
      background: #FFFFFF;
    }

    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .news-img-wrap {
      height: 180px;
    }

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

    .news-content {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .news-meta {
      display: flex;
      justify-content: space-between;
      font-size: 0.8rem;
      color: var(--color-text-muted);
      margin-bottom: 10px;
    }

    .news-tag {
      color: var(--color-accent);
      font-weight: 600;
    }

    .news-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--color-primary);
      line-height: 1.4;
      margin-bottom: 12px;
    }

    .news-summary {
      font-size: 0.875rem;
      color: var(--color-text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .news-anchor-link {
      margin-top: auto;
      font-size: 0.875rem;
      color: var(--color-accent);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 11. 选型与打样 FAQ 手风琴区（#faq） */
    .faq-section {
      background: var(--color-subtle-bg);
    }

    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 20px 24px;
      text-align: left;
      background: transparent;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--color-primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-icon {
      font-size: 1.25rem;
      font-weight: 400;
      color: var(--color-text-muted);
      transition: var(--transition);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--color-accent);
    }

    .faq-answer {
      padding: 0 24px 22px;
      font-size: 0.925rem;
      color: var(--color-text-muted);
      line-height: 1.75;
      display: none;
      border-top: 1px solid var(--color-light-bg);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 12. 汽车零部件定制打样与图纸评审 CTA 转化区（#contact） */
    .contact-section {
      background: var(--color-primary);
      color: #FFFFFF;
      position: relative;
    }

    .contact-card-box {
      background: #FFFFFF;
      color: var(--color-text-main);
      border-radius: var(--radius-lg);
      padding: 48px;
      box-shadow: var(--shadow-lg);
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 48px;
    }

    .contact-info h3 {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--color-primary);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .contact-info p {
      font-size: 0.95rem;
      color: var(--color-text-muted);
      line-height: 1.7;
      margin-bottom: 28px;
    }

    .contact-spec-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 30px;
    }

    .contact-spec-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.9rem;
      color: var(--color-text-main);
    }

    .contact-spec-item::before {
      content: '■';
      color: var(--color-accent);
      font-size: 0.75rem;
    }

    .contact-call-action {
      background: var(--color-subtle-bg);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border-left: 4px solid var(--color-accent);
    }

    .contact-call-action .call-label {
      font-size: 0.8rem;
      color: var(--color-text-muted);
    }

    .contact-call-action .call-num {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--color-primary);
      display: block;
      margin-top: 2px;
    }

    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .form-group-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .form-control {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-control label {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--color-primary);
    }

    .form-control input, .form-control select, .form-control textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: var(--color-text-main);
      background: var(--color-light-bg);
      outline: none;
      transition: var(--transition);
    }

    .form-control input:focus, .form-control select:focus, .form-control textarea:focus {
      border-color: var(--color-accent);
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.15);
    }

    .form-upload-box {
      border: 1px dashed var(--color-border);
      padding: 14px;
      border-radius: var(--radius-sm);
      background: var(--color-light-bg);
      text-align: center;
      font-size: 0.825rem;
      color: var(--color-text-muted);
    }

    .btn-submit {
      background: var(--color-accent);
      color: #FFFFFF;
      padding: 14px;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

    .btn-submit:hover {
      background: var(--color-accent-hover);
    }

    /* 页脚设计 */
    .site-footer {
      background: #111417;
      color: #94A3B8;
      font-size: 0.875rem;
      border-top: 1px solid var(--color-border-dark);
      padding: 64px 0 28px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-brand-title {
      font-size: 1.35rem;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .footer-desc {
      line-height: 1.7;
      margin-bottom: 20px;
      font-size: 0.875rem;
    }

    .footer-col-title {
      font-size: 1rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 18px;
      position: relative;
      padding-bottom: 8px;
    }

    .footer-col-title::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 24px;
      height: 2px;
      background: var(--color-accent);
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a:hover {
      color: #FFFFFF;
      padding-left: 4px;
    }

    .footer-bottom {
      border-top: 1px solid var(--color-border-dark);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8125rem;
    }

    .footer-domain-badge {
      font-family: monospace;
      color: #64748B;
    }

    /* 移动端与平板响应式适配 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .products-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .quality-steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .story-card-wrapper {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-card-box {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-top: 1px solid var(--color-border);
      }
      .nav-menu.active {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
      .hero-h1 {
        font-size: 2.1rem;
      }
      .section-padding {
        padding: 60px 0;
      }
      .section-title {
        font-size: 1.65rem;
      }
      .advantages-grid,
      .products-grid,
      .quality-steps-grid,
      .cases-grid,
      .reviews-grid,
      .news-grid {
        grid-template-columns: 1fr;
      }
      .form-group-row {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }