/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-hover: #0a365c;
      --accent: #10B981;
      --accent-hover: #059669;
      --dark-navy: #0A192F;
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --shadow-sm: 0 4px 6px -1px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.1);
      --radius: 8px;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.65;
    }
    a { text-decoration: none; color: inherit; transition: all 0.25s ease; }
    img { max-width: 100%; height: auto; display: block; object-fit: cover; }
    button, input, select, textarea { font-family: inherit; font-size: 1rem; }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 2rem;
      padding-right: 2rem;
    }
    .top-bar {
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.875rem;
      color: var(--text-muted);
      padding: 0.5rem 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .top-contact-list {
      display: flex;
      gap: 1.5rem;
      list-style: none;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: #FFFFFF;
      box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 74px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-symbol {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 1.1rem;
      font-weight: 900;
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 1.5rem;
      list-style: none;
    }
    .main-nav a {
      font-weight: 500;
      color: var(--text-body);
      font-size: 0.95rem;
    }
    .main-nav a:hover { color: var(--primary); }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 44px;
      padding: 0 1.5rem;
      border-radius: var(--radius);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 2px 4px rgba(15, 76, 129, 0.2);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(15, 76, 129, 0.35);
      color: #FFFFFF;
    }
    .btn-accent {
      background-color: var(--accent);
      color: #FFFFFF;
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary);
      color: #FFFFFF;
    }
    .section-wrap {
      padding: 5rem 0;
    }
    .section-alt {
      background-color: #FFFFFF;
    }
    .section-dark {
      background-color: var(--dark-navy);
      color: #E2E8F0;
    }
    .section-head {
      margin-bottom: 3rem;
      text-align: center;
    }
    .section-badge {
      display: inline-block;
      padding: 0.35rem 0.85rem;
      background: rgba(16, 185, 129, 0.12);
      color: var(--accent);
      border-radius: 999px;
      font-size: 0.8rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-head h2 {
      font-size: 2.25rem;
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    .section-dark .section-head h2 {
      color: #FFFFFF;
    }
    .section-head p {
      max-width: 780px;
      margin: 0 auto;
      color: var(--text-muted);
      font-size: 1.05rem;
    }
    .section-dark .section-head p {
      color: #94A3B8;
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
      padding: 4.5rem 0 3.5rem;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-content {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }
    .status-bar-pill {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 0.4rem 1rem;
      border-radius: 999px;
      font-size: 0.875rem;
      color: var(--text-body);
      box-shadow: var(--shadow-sm);
      margin-bottom: 1.5rem;
    }
    .pulse-dot {
      width: 10px;
      height: 10px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 1.25rem;
      letter-spacing: -1px;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-body);
      max-width: 820px;
      margin: 0 auto 2rem;
      line-height: 1.75;
    }
    .hero-cta-group {
      display: flex;
      justify-content: center;
      gap: 1rem;
      margin-bottom: 3rem;
      flex-wrap: wrap;
    }
    .hero-icon-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      text-align: left;
    }
    .hero-icon-card {
      background: #FFFFFF;
      padding: 1.5rem;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .hero-icon-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .hero-icon-symbol {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: rgba(15, 76, 129, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
    }
    .hero-icon-card h4 {
      font-size: 1.05rem;
      color: var(--text-main);
      margin-bottom: 0.4rem;
    }
    .hero-icon-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }
    /* About */
    .about-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
    }
    .about-img-box {
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-hover);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .about-img-box img {
      width: 100%;
      height: 420px;
    }
    .param-spec-box {
      background: #F1F5F9;
      border-left: 4px solid var(--primary);
      padding: 1rem 1.25rem;
      border-radius: 4px;
      margin-top: 1.5rem;
      font-size: 0.9rem;
      color: var(--text-body);
    }
    /* Grid 3 cols */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .feature-card {
      background: #FFFFFF;
      padding: 2.25rem 1.75rem;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(15, 76, 129, 0.3);
    }
    .feature-icon-pod {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: rgba(16, 185, 129, 0.12);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .feature-card h3 {
      font-size: 1.2rem;
      color: var(--text-main);
      margin-bottom: 0.75rem;
    }
    .feature-card p {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    /* Product Cards */
    .product-card {
      background: #FFFFFF;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
    }
    .product-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .product-thumb {
      height: 220px;
      width: 100%;
      overflow: hidden;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      transition: transform 0.4s ease;
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.05);
    }
    .product-info {
      padding: 1.75rem;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .product-tag {
      align-self: flex-start;
      background: rgba(15, 76, 129, 0.08);
      color: var(--primary);
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.2rem 0.6rem;
      border-radius: 4px;
      margin-bottom: 0.75rem;
    }
    .product-info h3 {
      font-size: 1.25rem;
      color: var(--text-main);
      margin-bottom: 0.5rem;
    }
    .product-info p {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 1.25rem;
      flex-grow: 1;
    }
    .product-specs {
      background: #F8FAFC;
      border-radius: 4px;
      padding: 0.75rem;
      font-size: 0.825rem;
      color: var(--text-body);
      margin-bottom: 1.25rem;
      border: 1px solid #EEF2F6;
    }
    /* Vision Section */
    .vision-flow {
      display: grid;
      grid-template-columns: 1fr auto 1fr auto 1fr;
      align-items: center;
      gap: 1.5rem;
      margin-top: 2rem;
    }
    .flow-node {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      padding: 2rem;
      border-radius: var(--radius);
      text-align: center;
    }
    .flow-node h3 {
      color: #FFFFFF;
      font-size: 1.25rem;
      margin-bottom: 0.75rem;
    }
    .flow-node p {
      color: #94A3B8;
      font-size: 0.9rem;
    }
    .flow-arrow {
      color: var(--accent);
      font-size: 1.75rem;
      font-weight: 700;
    }
    /* Steps */
    .steps-line {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 1.25rem;
      position: relative;
    }
    .step-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 1.5rem 1.25rem;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      width: 32px;
      height: 32px;
      background: var(--primary);
      color: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 1rem;
    }
    .step-item h4 {
      font-size: 1.05rem;
      color: var(--text-main);
      margin-bottom: 0.5rem;
    }
    .step-item p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }
    /* Cases */
    .cases-layout {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 2.5rem;
      align-items: stretch;
    }
    .main-case-box {
      background: #FFFFFF;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }
    .main-case-img {
      height: 260px;
      width: 100%;
    }
    .main-case-content {
      padding: 1.75rem;
      flex-grow: 1;
    }
    .main-case-content h3 {
      font-size: 1.35rem;
      color: var(--text-main);
      margin-bottom: 0.75rem;
    }
    .case-sub-list {
      display: flex;
      flex-direction: column;
      gap: 1.25rem;
    }
    .case-sub-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 1.25rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .case-sub-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
    }
    .case-sub-card h4 {
      font-size: 1.05rem;
      color: var(--text-main);
      margin-bottom: 0.35rem;
    }
    .case-sub-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
    }
    /* Stories */
    .story-item {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
      margin-bottom: 4rem;
    }
    .story-item:last-child { margin-bottom: 0; }
    .story-item.reverse { direction: rtl; }
    .story-item.reverse .story-text { direction: ltr; }
    .story-text h3 {
      font-size: 1.65rem;
      color: var(--text-main);
      margin-bottom: 1rem;
    }
    .story-text p {
      color: var(--text-body);
      margin-bottom: 1.25rem;
      line-height: 1.7;
      font-size: 0.95rem;
    }
    .story-img {
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }
    .story-img img { height: 320px; width: 100%; }
    /* Metrics */
    .metrics-bar {
      background: #0A192F;
      color: #FFFFFF;
      padding: 4rem 0;
      border-top: 1px solid rgba(255,255,255,0.08);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .metric-val {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 0.5rem;
      line-height: 1.1;
      font-variant-numeric: tabular-nums;
    }
    .metric-title {
      font-size: 1.05rem;
      color: #FFFFFF;
      margin-bottom: 0.35rem;
      font-weight: 600;
    }
    .metric-sub {
      font-size: 0.85rem;
      color: #94A3B8;
    }
    /* Reviews */
    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .quote-icon {
      font-size: 2.5rem;
      color: rgba(15, 76, 129, 0.15);
      line-height: 1;
      margin-bottom: 0.75rem;
      font-family: Georgia, serif;
    }
    .review-text {
      font-size: 0.925rem;
      color: var(--text-body);
      line-height: 1.65;
      margin-bottom: 1.5rem;
      flex-grow: 1;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      border-top: 1px solid #F1F5F9;
      padding-top: 1rem;
    }
    .reviewer-avatar {
      width: 42px;
      height: 42px;
      background: #E2E8F0;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
      font-size: 0.95rem;
    }
    .reviewer-info h4 {
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .reviewer-info p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    /* News */
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .news-cover {
      height: 180px;
      width: 100%;
    }
    .news-content {
      padding: 1.5rem;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 0.5rem;
    }
    .news-content h3 {
      font-size: 1.15rem;
      color: var(--text-main);
      margin-bottom: 0.75rem;
      line-height: 1.4;
    }
    .news-content p {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 1.25rem;
      flex-grow: 1;
      line-height: 1.6;
    }
    .news-link {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
    }
    /* FAQ Accordion */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-item summary {
      padding: 1.25rem 1.5rem;
      font-weight: 600;
      color: var(--text-main);
      font-size: 1.05rem;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after {
      content: "+";
      font-size: 1.35rem;
      color: var(--primary);
      transition: transform 0.25s;
    }
    .faq-item[open] summary::after {
      transform: rotate(45deg);
    }
    .faq-item[open] summary {
      border-bottom: 1px solid #F1F5F9;
      background-color: #F8FAFC;
    }
    .faq-body {
      padding: 1.25rem 1.5rem;
      font-size: 0.925rem;
      color: var(--text-body);
      line-height: 1.7;
    }
    /* Contact */
    .contact-card-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-hover);
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      overflow: hidden;
    }
    .contact-left {
      background: #0A192F;
      color: #E2E8F0;
      padding: 3rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .contact-left h3 {
      font-size: 1.75rem;
      color: #FFFFFF;
      margin-bottom: 1rem;
    }
    .contact-left p {
      color: #94A3B8;
      font-size: 0.95rem;
      margin-bottom: 2rem;
    }
    .contact-commitments {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 1rem;
      font-size: 0.925rem;
    }
    .contact-commitments li {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }
    .check-mark {
      color: var(--accent);
      font-weight: 700;
    }
    .contact-right {
      padding: 3rem;
    }
    .form-group {
      margin-bottom: 1.25rem;
    }
    .form-group label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 0.4rem;
    }
    .form-control {
      width: 100%;
      padding: 0.75rem 1rem;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.925rem;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
    }
    .form-control:focus {
      border-color: var(--primary);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }
    .form-privacy-note {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-top: 0.75rem;
    }
    /* Footer */
    .site-footer {
      background: #0B1320;
      color: #94A3B8;
      font-size: 0.9rem;
      padding-top: 4rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 2.5rem;
      margin-bottom: 3.5rem;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1.05rem;
      margin-bottom: 1.25rem;
      position: relative;
    }
    .footer-col p {
      line-height: 1.65;
      font-size: 0.875rem;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 0.65rem;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding: 1.5rem 0;
      text-align: center;
      font-size: 0.8rem;
    }
    .footer-bottom-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }
    /* Mobile nav toggle */
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 0.5rem;
    }
    .nav-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: all 0.3s;
    }
    /* Responsive Breakpoints */
    @media (max-width: 1024px) {
      .hero-icon-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .steps-line { grid-template-columns: repeat(2, 1fr); }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 2.5rem; }
      .cases-layout { grid-template-columns: 1fr; }
      .vision-flow { grid-template-columns: 1fr; }
      .flow-arrow { text-align: center; transform: rotate(90deg); margin: 0.5rem 0; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .container { padding-left: 1rem; padding-right: 1rem; }
      .section-wrap { padding: 3.5rem 0; }
      .nav-toggle { display: block; }
      .main-nav {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        align-items: flex-start;
        padding: 1.5rem 2rem;
        box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
      }
      .main-nav.active { display: flex; }
      .header-cta { display: none; }
      .hero-content h1 { font-size: 2.15rem; }
      .hero-desc { font-size: 1rem; }
      .hero-icon-grid { grid-template-columns: 1fr; }
      .about-split { grid-template-columns: 1fr; gap: 2rem; }
      .grid-3 { grid-template-columns: 1fr; }
      .story-item, .story-item.reverse { grid-template-columns: 1fr; gap: 2rem; }
      .story-item.reverse { direction: ltr; }
      .contact-card-box { grid-template-columns: 1fr; }
      .contact-left, .contact-right { padding: 2rem 1.5rem; }
      .steps-line { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom-inner { flex-direction: column; text-align: center; }
    }