/* roulang page: index */
:root {
      --primary: #0F2C59;
      --primary-dark: #0A1E3F;
      --primary-light: #1E468A;
      --accent: #00B4D8;
      --accent-warm: #FF6B35;
      --dark-base: #1A202C;
      --deep-tech: #0F172A;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #2D3748;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --border-dark: #334155;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 6px 12px -2px rgba(15, 44, 89, 0.08);
      --shadow-lg: 0 12px 24px -4px rgba(15, 44, 89, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
    }

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

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

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

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .section {
      padding: 90px 0;
      position: relative;
    }

    .section-dark {
      background-color: var(--deep-tech);
      color: #FFFFFF;
    }

    .section-alt {
      background-color: #F1F5F9;
    }

    .section-header {
      margin-bottom: 50px;
    }

    .section-header.text-center {
      text-align: center;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 999px;
      background: rgba(0, 180, 216, 0.12);
      color: var(--accent);
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .badge-tag.badge-orange {
      background: rgba(255, 107, 53, 0.12);
      color: var(--accent-warm);
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.35;
      margin-bottom: 16px;
    }

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

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 13px 28px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.25s ease;
      text-align: center;
      min-height: 46px;
    }

    .btn-primary {
      background-color: var(--accent-warm);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(255, 107, 53, 0.3);
    }

    .btn-primary:hover {
      background-color: #E85B27;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
    }

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

    .btn-outline:hover {
      background-color: rgba(0, 180, 216, 0.1);
      transform: translateY(-2px);
    }

    .btn-light-outline {
      background: rgba(255, 255, 255, 0.1);
      border-color: rgba(255, 255, 255, 0.3);
      color: #FFFFFF;
    }

    .btn-light-outline:hover {
      background: rgba(255, 255, 255, 0.2);
      border-color: #FFFFFF;
    }

    /* 顶部导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .top-bar {
      background-color: var(--primary-dark);
      color: #E2E8F0;
      font-size: 0.8rem;
      padding: 7px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

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

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

    .main-nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 0;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: bold;
    }

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

    .nav-links a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-main);
    }

    .nav-links a:hover {
      color: var(--accent);
    }

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

    /* Hero 板块：工业参数首屏 */
    .hero-section {
      background: linear-gradient(135deg, rgba(15, 44, 89, 0.94), rgba(10, 30, 63, 0.96)), url('/assets/images/9989fea36b17ead3.webp') center/cover no-repeat;
      color: #FFFFFF;
      padding: 85px 0 60px;
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

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

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

    .hero-lead {
      font-size: 1.1rem;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 30px;
    }

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

    .hero-param-box {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
      padding: 24px;
      backdrop-filter: blur(8px);
    }

    .hero-param-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--accent);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .param-row {
      display: flex;
      justify-content: space-between;
      padding: 10px 0;
      border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
      font-size: 0.88rem;
    }

    .param-row:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }

    .param-label {
      color: #94A3B8;
    }

    .param-val {
      color: #FFFFFF;
      font-weight: 600;
    }

    /* 板块 2：全景指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      text-align: left;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      position: relative;
      overflow: hidden;
    }

    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 4px;
      height: 100%;
      background: var(--accent);
    }

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

    .metric-num {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }

    .metric-num span {
      font-size: 1.15rem;
      font-weight: 600;
      color: var(--accent-warm);
    }

    .metric-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--dark-base);
    }

    .metric-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 3：左资讯流 + 右热榜 */
    .stream-rank-grid {
      display: grid;
      grid-template-columns: 1.4fr 0.8fr;
      gap: 36px;
    }

    .news-stream-card {
      display: flex;
      gap: 20px;
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      margin-bottom: 20px;
      transition: all 0.25s ease;
    }

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

    .news-img {
      width: 170px;
      height: 115px;
      border-radius: var(--radius-sm);
      object-fit: cover;
      flex-shrink: 0;
    }

    .news-content {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .news-title {
      font-size: 1.08rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 6px;
      line-height: 1.4;
    }

    .news-desc {
      font-size: 0.86rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 8px;
    }

    .news-meta {
      font-size: 0.78rem;
      color: var(--text-light);
      display: flex;
      gap: 14px;
    }

    .rank-board {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
    }

    .rank-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary);
      padding-bottom: 14px;
      border-bottom: 2px solid var(--border-color);
      margin-bottom: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .rank-list {
      list-style: none;
    }

    .rank-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      padding: 12px 0;
      border-bottom: 1px solid #F1F5F9;
    }

    .rank-item:last-child {
      border-bottom: none;
    }

    .rank-badge {
      width: 24px;
      height: 24px;
      background: #E2E8F0;
      color: var(--dark-base);
      font-weight: 700;
      font-size: 0.8rem;
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    .rank-item:nth-child(1) .rank-badge { background: #FF6B35; color: #FFF; }
    .rank-item:nth-child(2) .rank-badge { background: #00B4D8; color: #FFF; }
    .rank-item:nth-child(3) .rank-badge { background: #0F2C59; color: #FFF; }

    .rank-text h4 {
      font-size: 0.92rem;
      font-weight: 600;
      margin-bottom: 4px;
      color: var(--text-main);
    }

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

    /* 板块 4：专题条与优惠领券墙 */
    .promo-banner {
      background: linear-gradient(135deg, #1E468A, #0F2C59);
      border-radius: var(--radius-lg);
      padding: 40px;
      color: #FFFFFF;
      margin-bottom: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .coupon-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .coupon-card {
      background: var(--bg-white);
      border: 1px dashed var(--accent);
      border-radius: var(--radius-md);
      padding: 22px;
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .coupon-value {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--accent-warm);
      margin-bottom: 4px;
    }

    .coupon-name {
      font-weight: 700;
      font-size: 0.98rem;
      color: var(--primary);
      margin-bottom: 6px;
    }

    .coupon-rule {
      font-size: 0.82rem;
      color: var(--text-muted);
      line-height: 1.5;
      margin-bottom: 14px;
    }

    /* 板块 5：核心优势 6网格 */
    .strengths-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .strength-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      transition: all 0.25s ease;
    }

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

    .strength-icon {
      width: 48px;
      height: 48px;
      background: rgba(15, 44, 89, 0.06);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.4rem;
      margin-bottom: 18px;
    }

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

    .strength-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 6：中台服务矩阵 3大支柱 */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .matrix-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px 26px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }

    .matrix-tag {
      font-size: 0.8rem;
      color: var(--accent-warm);
      font-weight: 700;
      margin-bottom: 8px;
    }

    .matrix-name {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 14px;
    }

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

    .checklist {
      list-style: none;
      margin-bottom: 24px;
      flex-grow: 1;
    }

    .checklist li {
      position: relative;
      padding-left: 22px;
      font-size: 0.88rem;
      color: var(--dark-base);
      margin-bottom: 10px;
      line-height: 1.5;
    }

    .checklist li::before {
      content: "✓";
      position: absolute;
      left: 0;
      color: var(--accent);
      font-weight: bold;
    }

    /* 板块 7：深色架构理念对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }

    .compare-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 34px;
    }

    .compare-card.highlight {
      background: rgba(0, 180, 216, 0.05);
      border-color: var(--accent);
    }

    .compare-head {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 20px;
      padding-bottom: 14px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .compare-row {
      margin-bottom: 18px;
    }

    .compare-label {
      font-size: 0.85rem;
      color: #94A3B8;
      margin-bottom: 4px;
    }

    .compare-text {
      font-size: 0.95rem;
      color: #E2E8F0;
      line-height: 1.55;
    }

    /* 板块 8：实施里程碑 */
    .steps-flow {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-box {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px 20px;
      position: relative;
    }

    .step-index {
      font-size: 1.8rem;
      font-weight: 800;
      color: rgba(15, 44, 89, 0.15);
      line-height: 1;
      margin-bottom: 10px;
    }

    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.84rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 9：关键运营数据条 */
    .stat-strip {
      background: var(--accent);
      color: #FFFFFF;
      padding: 40px 0;
    }

    .stat-strip-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-strip-num {
      font-size: 2.2rem;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .stat-strip-label {
      font-size: 0.9rem;
      font-weight: 600;
      opacity: 0.95;
    }

    /* 板块 10：客户案例与场景展示 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 26px;
    }

    .case-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .case-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .case-body {
      padding: 22px;
    }

    .case-industry {
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--accent);
      margin-bottom: 6px;
    }

    .case-h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
      line-height: 1.4;
    }

    .case-text {
      font-size: 0.86rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 14px;
    }

    .case-stat-badge {
      display: inline-block;
      background: #F1F5F9;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.78rem;
      color: var(--dark-base);
      font-weight: 600;
    }

    /* 板块 11：媒体合作与技术白皮书 */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .insight-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .insight-date {
      font-size: 0.78rem;
      color: var(--text-light);
      margin-bottom: 8px;
    }

    .insight-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
      line-height: 1.4;
    }

    .insight-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    /* 板块 12：常见技术与合作 FAQ */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.02rem;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      color: var(--accent);
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-question::after {
      content: "−";
    }

    .faq-answer {
      padding: 0 24px 20px;
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }

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

    /* 板块 13：方案索取表单收口 */
    .form-section-wrapper {
      background: linear-gradient(135deg, #0F2C59, #0A1E3F);
      border-radius: var(--radius-lg);
      padding: 50px 40px;
      color: #FFFFFF;
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      align-items: center;
    }

    .form-content h3 {
      font-size: 1.85rem;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .form-content p {
      font-size: 0.95rem;
      color: #CBD5E1;
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .consult-form {
      background: #FFFFFF;
      padding: 30px;
      border-radius: var(--radius-md);
      color: var(--text-main);
    }

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

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

    .form-group.full-width {
      grid-column: span 2;
    }

    .form-group label {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--dark-base);
    }

    .form-control {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 10px 14px;
      font-size: 0.9rem;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--accent);
    }

    /* 页脚 Footer */
    .site-footer {
      background-color: var(--dark-base);
      color: #94A3B8;
      padding: 60px 0 25px;
      font-size: 0.88rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

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

    .footer-trust-badges {
      display: flex;
      gap: 10px;
      margin-top: 14px;
    }

    .trust-badge {
      background: rgba(255, 255, 255, 0.08);
      padding: 4px 8px;
      border-radius: 4px;
      font-size: 0.75rem;
      color: #CBD5E1;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .stream-rank-grid { grid-template-columns: 1fr; }
      .strengths-grid { grid-template-columns: repeat(2, 1fr); }
      .matrix-grid { grid-template-columns: 1fr; }
      .steps-flow { grid-template-columns: repeat(2, 1fr); }
      .stat-strip-grid { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: 1fr; }
      .insights-grid { grid-template-columns: 1fr; }
      .coupon-grid { grid-template-columns: 1fr; }
      .form-section-wrapper { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .nav-links { display: none; }
      .hero-h1 { font-size: 2.1rem; }
      .section { padding: 55px 0; }
      .compare-grid { grid-template-columns: 1fr; }
      .news-stream-card { flex-direction: column; }
      .news-img { width: 100%; height: 160px; }
      .form-grid { grid-template-columns: 1fr; }
      .form-group.full-width { grid-column: span 1; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
    }