/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-hover: #0c3d68;
      --secondary: #0284C7;
      --accent: #F97316;
      --dark-navy: #0A192F;
      --dark-surface: #112240;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --border-color: rgba(226, 232, 240, 0.85);
      --border-dark: rgba(255, 255, 255, 0.12);
      --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --card-shadow-hover: 0 16px 32px -4px rgba(15, 76, 129, 0.13);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-body);
      background-color: var(--bg-light);
      line-height: 1.68;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    a { color: var(--primary); text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--secondary); }
    img { max-width: 100%; height: auto; display: block; }
    h1, h2, h3, h4, h5, h6 { color: var(--text-main); font-weight: 700; line-height: 1.35; margin: 0 0 16px 0; }
    p { margin: 0 0 16px 0; }

    /* Top Command Nav */
    .top-sub-bar {
      background: #091e38;
      color: #94A3B8;
      font-size: 13px;
      padding: 7px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-sub-bar a { color: #CBD5E1; }
    .top-sub-bar a:hover { color: #FFFFFF; }
    .header-main {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1000;
      padding: 14px 0;
      box-shadow: 0 2px 10px rgba(15, 23, 42, 0.03);
    }
    .brand-logo {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.3px;
    }
    .brand-logo svg {
      width: 28px;
      height: 28px;
      fill: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 22px;
    }
    .nav-links a {
      color: var(--text-body);
      font-size: 15px;
      font-weight: 500;
      padding: 6px 2px;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a.active::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .command-bar-box {
      display: flex;
      align-items: center;
      background: #F1F5F9;
      border: 1px solid #CBD5E1;
      border-radius: var(--radius-sm);
      padding: 6px 12px;
      font-size: 13px;
      color: var(--text-muted);
      cursor: pointer;
      margin-right: 14px;
    }
    .command-bar-box kbd {
      background: #FFFFFF;
      border: 1px solid #CBD5E1;
      border-radius: 4px;
      padding: 1px 5px;
      font-size: 11px;
      font-family: inherit;
      color: var(--text-body);
      margin-left: 8px;
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 11px 24px;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      font-size: 15px;
      line-height: 1.4;
      text-align: center;
    }
    .btn:active { transform: translateY(1px); }
    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(15, 76, 129, 0.25);
    }
    .btn-secondary {
      background: #FFFFFF;
      border-color: #CBD5E1;
      color: var(--text-body);
    }
    .btn-secondary:hover {
      background: #F8FAFC;
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-accent {
      background: var(--accent);
      color: #FFFFFF;
    }
    .btn-accent:hover {
      background: #ea580c;
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(249, 115, 22, 0.35);
    }
    .btn-sm { padding: 7px 16px; font-size: 14px; }

    /* Section Global */
    .site-section {
      padding: 85px 0;
      position: relative;
    }
    .section-white { background-color: var(--bg-white); }
    .section-light { background-color: var(--bg-light); }
    .section-dark {
      background-color: var(--dark-navy);
      color: #E2E8F0;
    }
    .section-dark h2, .section-dark h3, .section-dark h4 { color: #FFFFFF; }
    .section-dark p { color: #94A3B8; }

    .sec-header {
      margin-bottom: 50px;
    }
    .sec-badge {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      background: rgba(15, 76, 129, 0.08);
      padding: 4px 14px;
      border-radius: 30px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
      text-transform: uppercase;
    }
    .section-dark .sec-badge {
      background: rgba(2, 132, 199, 0.18);
      color: #38BDF8;
    }
    .sec-title {
      font-size: 32px;
      margin-bottom: 14px;
      color: var(--text-main);
    }
    .sec-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0;
      line-height: 1.7;
    }
    .text-center .sec-subtitle { margin-left: auto; margin-right: auto; }

    /* Hero Section (Industrial parameter theme) */
    .hero-banner {
      position: relative;
      background: linear-gradient(135deg, rgba(10, 25, 47, 0.94) 0%, rgba(15, 76, 129, 0.88) 100%), url('/assets/images/24fc5005e3c8bca4.jpg') center/cover no-repeat;
      padding: 85px 0 75px 0;
      color: #FFFFFF;
      overflow: hidden;
    }
    .hero-banner h1 {
      font-size: 42px;
      color: #FFFFFF;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
    }
    .hero-desc {
      font-size: 17px;
      color: #E2E8F0;
      line-height: 1.8;
      max-width: 680px;
      margin-bottom: 30px;
    }
    .hero-specs-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 40px;
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.16);
      border-radius: var(--radius-md);
      padding: 24px;
    }
    .spec-item {
      border-right: 1px solid rgba(255, 255, 255, 0.12);
      padding: 0 16px;
    }
    .spec-item:last-child { border-right: none; }
    .spec-val {
      font-size: 26px;
      font-weight: 800;
      color: #38BDF8;
      display: block;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }
    .spec-lbl {
      font-size: 13px;
      color: #CBD5E1;
      margin-top: 4px;
    }

    /* Countdown Strip */
    .countdown-bar {
      background: #0284C7;
      color: #FFFFFF;
      padding: 16px 0;
    }
    .countdown-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }
    .countdown-timer-group {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .cd-digit {
      background: rgba(0, 0, 0, 0.25);
      padding: 4px 10px;
      border-radius: 4px;
      font-weight: 700;
      font-family: monospace;
      font-size: 18px;
    }

    /* Cards standard */
    .tech-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .tech-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
      border-color: #BAE6FD;
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: rgba(15, 76, 129, 0.08);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
    }
    .card-icon svg { width: 24px; height: 24px; }
    .tech-card h3 { font-size: 19px; margin-bottom: 12px; }
    .tech-card p { font-size: 15px; color: var(--text-muted); margin-bottom: 0; line-height: 1.65; }

    /* Plan & Pricing Matrix */
    .product-tier-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px 30px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      position: relative;
      height: 100%;
    }
    .product-tier-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 12px 30px -4px rgba(15, 76, 129, 0.16);
    }
    .tier-badge {
      position: absolute;
      top: -14px;
      right: 24px;
      background: var(--accent);
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      padding: 3px 12px;
      border-radius: 20px;
    }
    .tier-header { margin-bottom: 24px; padding-bottom: 20px; border-bottom: 1px solid var(--border-color); }
    .tier-header h3 { font-size: 22px; margin-bottom: 8px; }
    .tier-spec { font-size: 14px; color: var(--text-muted); }
    .tier-list { list-style: none; margin: 0 0 28px 0; padding: 0; flex-grow: 1; }
    .tier-list li {
      font-size: 14px;
      color: var(--text-body);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .tier-list li svg { width: 16px; height: 16px; fill: #10B981; flex-shrink: 0; }

    /* Dark Deep Architecture */
    .dark-card-flow {
      background: var(--dark-surface);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px;
      height: 100%;
    }
    .dark-card-flow h4 { color: #FFFFFF; font-size: 18px; margin-bottom: 12px; }
    .dark-card-flow p { font-size: 14px; line-height: 1.6; }

    /* Workflow Chain */
    .step-item {
      position: relative;
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      height: 100%;
    }
    .step-num {
      font-size: 30px;
      font-weight: 800;
      color: #E2E8F0;
      line-height: 1;
      margin-bottom: 16px;
      font-family: monospace;
    }

    /* Stats Banner */
    .stats-band {
      background: linear-gradient(90deg, #0F4C81 0%, #0369A1 100%);
      color: #FFFFFF;
      padding: 60px 0;
    }
    .stat-box { text-align: center; }
    .stat-box .num {
      font-size: 40px;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 6px;
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    }
    .stat-box .label { font-size: 15px; color: #E0F2FE; }

    /* Testimonials */
    .quote-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .quote-content { font-size: 15px; color: var(--text-body); font-style: italic; margin-bottom: 24px; flex-grow: 1; line-height: 1.7; }
    .quote-author { display: flex; align-items: center; gap: 14px; }
    .avatar-mock {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .author-info h4 { font-size: 16px; margin: 0; }
    .author-info span { font-size: 13px; color: var(--text-muted); }

    /* News Cards */
    .news-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      height: 100%;
      display: flex;
      flex-direction: column;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .news-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-3px);
    }
    .news-thumb {
      height: 190px;
      overflow: hidden;
      background: #E2E8F0;
    }
    .news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
    .news-card:hover .news-thumb img { transform: scale(1.05); }
    .news-body { padding: 24px; flex-grow: 1; display: flex; flex-direction: column; }
    .news-date { font-size: 12px; color: var(--text-muted); margin-bottom: 8px; }
    .news-body h3 { font-size: 17px; margin-bottom: 10px; }
    .news-body p { font-size: 14px; color: var(--text-muted); margin-bottom: 0; line-height: 1.6; }

    /* FAQ accordion styling override Foundation */
    .accordion {
      background: transparent;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .accordion-item {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-color);
    }
    .accordion-item:last-child { border-bottom: none; }
    .accordion-title {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      padding: 18px 24px;
      border: none;
    }
    .accordion-title:hover { background: #F8FAFC; color: var(--primary); }
    .accordion-content {
      padding: 18px 24px;
      color: var(--text-body);
      font-size: 15px;
      line-height: 1.7;
      border-top: 1px dashed var(--border-color);
      background: #FAFAFA;
    }

    /* Trust Guarantees */
    .guarantee-bar-item {
      text-align: center;
      padding: 24px 16px;
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      height: 100%;
    }
    .guarantee-bar-item svg { width: 36px; height: 36px; fill: var(--primary); margin-bottom: 12px; }
    .guarantee-bar-item h4 { font-size: 16px; margin-bottom: 6px; }
    .guarantee-bar-item p { font-size: 13px; color: var(--text-muted); margin-bottom: 0; }

    /* CTA Banner Form */
    .cta-strip-box {
      background: linear-gradient(135deg, #0F4C81 0%, #1E3A8A 100%);
      border-radius: var(--radius-lg);
      padding: 50px 40px;
      color: #FFFFFF;
    }
    .cta-strip-box h2 { color: #FFFFFF; font-size: 32px; margin-bottom: 16px; }
    .cta-form-row {
      display: grid;
      grid-template-columns: 2fr 1fr auto;
      gap: 14px;
      margin-top: 24px;
    }
    .cta-form-row input, .cta-form-row select {
      background: #FFFFFF;
      border: 1px solid #CBD5E1;
      border-radius: var(--radius-sm);
      height: 48px;
      padding: 0 16px;
      margin: 0;
      color: var(--text-main);
      font-size: 15px;
    }

    /* Footer */
    .site-footer {
      background: #08162B;
      color: #94A3B8;
      padding: 70px 0 30px 0;
      font-size: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .site-footer h4 { color: #FFFFFF; font-size: 16px; margin-bottom: 20px; font-weight: 600; }
    .site-footer ul { list-style: none; margin: 0; padding: 0; }
    .site-footer ul li { margin-bottom: 10px; }
    .site-footer ul li a { color: #94A3B8; }
    .site-footer ul li a:hover { color: #FFFFFF; }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin-top: 50px;
      padding-top: 24px;
      font-size: 13px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* Responsive */
    @media screen and (max-width: 1024px) {
      .hero-specs-row { grid-template-columns: repeat(2, 1fr); }
      .nav-links { display: none; }
      .cta-form-row { grid-template-columns: 1fr; }
    }
    @media screen and (max-width: 640px) {
      .hero-banner h1 { font-size: 28px; }
      .hero-specs-row { grid-template-columns: 1fr; }
      .site-section { padding: 50px 0; }
      .sec-title { font-size: 24px; }
    }