/* roulang page: index */
:root {
      --primary: #0A4D9C;
      --primary-hover: #083c7a;
      --secondary: #0084FF;
      --secondary-soft: #E6F3FF;
      --accent-green: #00A870;
      --accent-orange: #FF7D00;
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --bg-dark: #0F1E36;
      --bg-dark-alt: #0B132B;
      --text-heading: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --shadow-sm: 0 2px 6px -1px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
      --shadow-hover: 0 16px 32px -4px rgba(10, 77, 156, 0.12);
      --transition: all 0.25s ease-in-out;
      --container-max: 1240px;
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    ul, ol {
      list-style: none;
    }
    button, input, select, textarea {
      font: inherit;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .section-sp {
      padding: 85px 0;
    }
    .section-title-wrap {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 52px;
    }
    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      background: var(--secondary-soft);
      color: var(--primary);
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-heading);
      line-height: 1.35;
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 24px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      min-height: 44px;
      line-height: 1;
    }
    .btn-primary {
      background: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(10, 77, 156, 0.25);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 6px 18px rgba(10, 77, 156, 0.35);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--secondary-soft);
      transform: translateY(-2px);
    }
    .btn-white {
      background: #ffffff;
      color: var(--primary);
      font-weight: 700;
    }
    .btn-white:hover {
      background: #f1f5f9;
      transform: translateY(-2px);
    }
    .top-bar {
      background: #0b1c36;
      color: #94a3b8;
      font-size: 12px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 8px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
    }
    .top-bar-left, .top-bar-right {
      display: flex;
      align-items: center;
      gap: 18px;
    }
    .top-badge {
      display: inline-block;
      padding: 2px 8px;
      background: rgba(0, 168, 112, 0.2);
      color: #4ade80;
      border-radius: 4px;
      font-size: 11px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: #ffffff;
      box-shadow: 0 2px 10px rgba(15, 23, 42, 0.06);
    }
    .main-nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 19px;
      font-weight: 700;
      color: var(--primary);
    }
    .logo-mark {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      font-weight: 900;
      font-size: 20px;
      box-shadow: 0 3px 10px rgba(10, 77, 156, 0.3);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 22px;
    }
    .nav-link {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 4px;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--secondary);
    }
    .nav-link.active::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: var(--secondary);
      border-radius: 2px;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .nav-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-heading);
      margin: 5px 0;
      transition: var(--transition);
    }
    .hero-section {
      padding: 70px 0 90px;
      background: linear-gradient(180deg, #F0F6FD 0%, #F8FAFC 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1.15fr;
      gap: 40px;
      align-items: center;
    }
    .hero-text {
      position: relative;
      z-index: 2;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #e0edff;
      color: var(--primary);
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .hero-title {
      font-size: 40px;
      line-height: 1.25;
      color: var(--text-heading);
      font-weight: 800;
      margin-bottom: 20px;
    }
    .hero-desc {
      font-size: 15px;
      color: var(--text-body);
      line-height: 1.8;
      margin-bottom: 30px;
    }
    .hero-buttons {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
      margin-bottom: 36px;
    }
    .hero-keypoints {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 1px solid rgba(226, 232, 240, 0.8);
      padding-top: 24px;
    }
    .hero-point-num {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .hero-point-txt {
      font-size: 12px;
      color: var(--text-muted);
    }
    .stack-stage {
      position: relative;
      min-height: 480px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .stack-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      transition: var(--transition);
    }
    .stack-card-main {
      width: 82%;
      position: relative;
      z-index: 3;
      box-shadow: 0 20px 40px -10px rgba(10, 77, 156, 0.2);
    }
    .stack-card-main img {
      width: 100%;
      height: 280px;
      object-fit: cover;
    }
    .stack-card-main .stack-body {
      padding: 18px 22px;
    }
    .stack-side-1 {
      position: absolute;
      width: 58%;
      top: 10px;
      right: 0;
      z-index: 2;
      opacity: 0.95;
      transform: rotate(2.5deg);
    }
    .stack-side-1 img {
      width: 100%;
      height: 160px;
      object-fit: cover;
    }
    .stack-side-2 {
      position: absolute;
      width: 56%;
      bottom: 12px;
      left: 0;
      z-index: 4;
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.12);
      transform: rotate(-2deg);
    }
    .stack-side-2 .stack-body {
      padding: 16px;
      background: #ffffff;
    }
    .card-meta-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-top: 8px;
      font-size: 12px;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 11px;
      padding: 2px 8px;
      border-radius: 4px;
      background: rgba(0, 168, 112, 0.12);
      color: var(--accent-green);
      font-weight: 600;
    }
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card-box {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      padding: 28px 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .card-box:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: #cbd5e1;
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: var(--secondary-soft);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 20px;
      font-weight: 700;
    }
    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 12px;
    }
    .card-text {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      flex-grow: 1;
    }
    .card-tag {
      margin-top: 16px;
      font-size: 12px;
      color: var(--primary);
      font-weight: 600;
    }
    .solution-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .solution-img-box {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .solution-img-box img {
      width: 100%;
      height: 440px;
      object-fit: cover;
    }
    .solution-floating-chip {
      position: absolute;
      bottom: 24px;
      right: 24px;
      background: rgba(15, 30, 54, 0.9);
      backdrop-filter: blur(8px);
      color: #ffffff;
      padding: 14px 20px;
      border-radius: var(--radius-sm);
      font-size: 13px;
      border: 1px solid rgba(255, 255, 255, 0.15);
    }
    .feature-list {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .feature-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      padding: 14px;
      background: #ffffff;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }
    .feature-check {
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: var(--accent-green);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      flex-shrink: 0;
      margin-top: 2px;
    }
    .feature-item-content h4 {
      font-size: 15px;
      color: var(--text-heading);
      margin-bottom: 4px;
    }
    .feature-item-content p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .dark-section {
      background-color: var(--bg-dark);
      color: #ffffff;
      padding: 90px 0;
      position: relative;
      overflow: hidden;
    }
    .dark-section .section-title {
      color: #ffffff;
    }
    .dark-section .section-subtitle {
      color: #94a3b8;
    }
    .dark-section .section-tag {
      background: rgba(0, 132, 255, 0.2);
      color: #38bdf8;
    }
    .dark-grid {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .dark-card {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 24px;
    }
    .dark-pillar-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .dark-pillar-item {
      padding: 18px;
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, 0.03);
      border-left: 4px solid var(--secondary);
    }
    .dark-pillar-title {
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 6px;
    }
    .dark-pillar-desc {
      font-size: 13px;
      color: #94a3b8;
      line-height: 1.6;
    }
    .story-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: grid;
      grid-template-columns: 42% 58%;
    }
    .story-img {
      height: 100%;
      min-height: 280px;
      object-fit: cover;
      width: 100%;
    }
    .story-content {
      padding: 30px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .story-tag {
      align-self: flex-start;
      font-size: 12px;
      color: var(--primary);
      background: var(--secondary-soft);
      padding: 3px 10px;
      border-radius: 4px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .story-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 12px;
    }
    .story-desc {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .story-meta-stats {
      display: flex;
      gap: 28px;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }
    .story-stat-num {
      font-size: 22px;
      font-weight: 800;
      color: var(--primary);
    }
    .story-stat-label {
      font-size: 12px;
      color: var(--text-muted);
    }
    .metric-strip {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 50px 0;
    }
    .counter-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .counter-item {
      padding: 0 16px;
      position: relative;
    }
    .counter-item:not(:last-child)::after {
      content: "";
      position: absolute;
      right: 0;
      top: 15%;
      height: 70%;
      width: 1px;
      background: var(--border-color);
    }
    .counter-num {
      font-size: 44px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .counter-label {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 4px;
    }
    .counter-sub {
      font-size: 12px;
      color: var(--text-muted);
    }
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 26px 20px;
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-num-badge {
      width: 34px;
      height: 34px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      margin-bottom: 16px;
    }
    .step-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 8px;
    }
    .step-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .review-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #f59e0b;
      margin-bottom: 14px;
      font-size: 15px;
      letter-spacing: 2px;
    }
    .review-quote {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: normal;
    }
    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }
    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--secondary-soft);
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }
    .reviewer-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-heading);
    }
    .reviewer-title {
      font-size: 12px;
      color: var(--text-muted);
    }
    .news-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .news-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .news-content {
      padding: 20px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-summary {
      font-size: 13px;
      color: var(--text-body);
      line-height: 1.6;
      flex-grow: 1;
    }
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 22px;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-heading);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-answer {
      padding: 0 22px 18px;
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      display: none;
      border-top: 1px dashed var(--border-color);
      margin-top: -6px;
      padding-top: 14px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-arrow {
      transition: transform 0.2s ease;
      font-size: 12px;
      color: var(--text-muted);
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }
    .contact-section {
      background: linear-gradient(135deg, #0A4D9C 0%, #0F1E36 100%);
      color: #ffffff;
      padding: 85px 0;
    }
    .contact-grid {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .contact-info-title {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 18px;
    }
    .contact-info-desc {
      font-size: 15px;
      color: #cbd5e1;
      line-height: 1.8;
      margin-bottom: 30px;
    }
    .contact-pill-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .contact-pill-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 14px;
      color: #e2e8f0;
    }
    .contact-form-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 32px;
      color: var(--text-body);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-heading);
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10, 77, 156, 0.15);
    }
    .form-submit-btn {
      width: 100%;
      padding: 13px;
      background: var(--primary);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      transition: var(--transition);
      margin-top: 10px;
    }
    .form-submit-btn:hover {
      background: var(--primary-hover);
    }
    .form-privacy-note {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 12px;
      text-align: center;
    }
    .site-footer {
      background: var(--bg-dark-alt);
      color: #94a3b8;
      font-size: 13px;
      padding-top: 65px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1.2fr 1.3fr;
      gap: 36px;
      padding-bottom: 50px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-title {
      font-size: 15px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }
    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .footer-contact-item {
      margin-bottom: 12px;
      line-height: 1.6;
    }
    .footer-bottom {
      padding: 24px 0;
      text-align: center;
      font-size: 12px;
      color: #64748b;
    }
    .footer-bottom-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .product-spec-list {
      margin-top: 16px;
      padding-top: 14px;
      border-top: 1px dashed var(--border-color);
      font-size: 13px;
      color: var(--text-muted);
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .product-spec-item {
      display: flex;
      justify-content: space-between;
    }
    .eco-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
      text-align: center;
    }
    .eco-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 16px 10px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-heading);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 50px;
      }
      .stack-stage {
        min-height: 380px;
      }
      .card-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .solution-split {
        grid-template-columns: 1fr;
      }
      .dark-grid {
        grid-template-columns: 1fr;
      }
      .story-card {
        grid-template-columns: 1fr;
      }
      .counter-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
      }
      .counter-item:not(:last-child)::after {
        display: none;
      }
      .step-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .eco-grid {
        grid-template-columns: repeat(3, 1fr);
      }
    }
    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
        display: none;
      }
      .nav-menu.show {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
      .nav-actions .btn {
        display: none;
      }
      .hero-title {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
      .card-grid-3, .card-grid-2, .card-grid-4 {
        grid-template-columns: 1fr;
      }
      .stack-stage {
        min-height: 300px;
      }
      .stack-card-main {
        width: 100%;
      }
      .stack-side-1, .stack-side-2 {
        display: none;
      }
      .step-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eco-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .story-meta-stats {
        flex-direction: column;
        gap: 12px;
      }
    }