/* roulang page: index */
:root {
      --bg-dark: #0a0f1d;
      --bg-surface: #0f172a;
      --bg-card: rgba(30, 41, 59, 0.72);
      --border-color: rgba(255, 255, 255, 0.08);
      --primary-cyan: #00f0ff;
      --primary-blue: #0284c7;
      --accent-green: #10b981;
      --text-main: #ffffff;
      --text-muted: #94a3b8;
      --text-sub: #64748b;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.35);
      --shadow-card: 0 14px 35px -10px rgba(0, 0, 0, 0.6);
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      background-color: var(--bg-dark);
      color: var(--text-muted);
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    a { text-decoration: none; transition: all 0.3s ease; }
    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; }
    .top-bar {
      background: #060913;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.85rem;
      color: var(--text-sub);
      padding: 7px 0;
    }
    .top-bar a { color: var(--text-muted); }
    .top-bar a:hover { color: var(--primary-cyan); }
    .site-nav {
      background: rgba(15, 23, 42, 0.88);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .brand-logo {
      font-size: 1.4rem;
      font-weight: 800;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .brand-logo span {
      background: linear-gradient(135deg, #00f0ff, #38bdf8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-link {
      color: var(--text-muted) !important;
      font-weight: 500;
      padding: 0.6rem 1rem !important;
      transition: color 0.25s ease;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary-cyan) !important;
    }
    .step-progress-bar {
      background: rgba(10, 15, 29, 0.95);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      padding: 8px 0;
    }
    .step-pill-wrapper {
      display: flex;
      justify-content: space-between;
      gap: 10px;
      overflow-x: auto;
      white-space: nowrap;
      padding: 2px 0;
    }
    .step-pill {
      font-size: 0.82rem;
      padding: 5px 16px;
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-color);
      color: var(--text-muted);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .step-pill span.num {
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: rgba(0, 240, 255, 0.15);
      color: var(--primary-cyan);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.72rem;
      font-weight: 700;
    }
    .step-pill:hover {
      border-color: var(--primary-cyan);
      color: #fff;
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.2);
    }
    .btn-glow-primary {
      background: linear-gradient(135deg, var(--primary-cyan) 0%, #0284c7 100%);
      color: #04101e !important;
      font-weight: 700;
      border: none;
      border-radius: var(--radius-sm);
      padding: 11px 26px;
      box-shadow: var(--shadow-glow);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.3s ease;
    }
    .btn-glow-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 35px rgba(0, 240, 255, 0.6);
      color: #000 !important;
    }
    .btn-glass-secondary {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: #fff !important;
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 11px 24px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      backdrop-filter: blur(8px);
      transition: all 0.3s ease;
    }
    .btn-glass-secondary:hover {
      background: rgba(255, 255, 255, 0.12);
      border-color: var(--primary-cyan);
      color: var(--primary-cyan) !important;
      transform: translateY(-2px);
    }
    .section-spacing {
      padding: 85px 0;
      position: relative;
    }
    .section-alt {
      background: var(--bg-surface);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-heading {
      margin-bottom: 45px;
    }
    .section-heading .badge-title {
      font-size: 0.8rem;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: var(--primary-cyan);
      background: rgba(0, 240, 255, 0.08);
      border: 1px solid rgba(0, 240, 255, 0.2);
      padding: 5px 14px;
      border-radius: 30px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .section-heading h2 {
      font-size: 2.15rem;
      margin-bottom: 15px;
    }
    .section-heading p {
      max-width: 780px;
      margin: 0 auto;
      font-size: 1.05rem;
      color: var(--text-muted);
    }
    .glass-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-card);
      padding: 28px;
      height: 100%;
      position: relative;
      transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    }
    .glass-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 15%;
      right: 15%;
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    }
    .glass-card:hover {
      transform: translateY(-5px);
      border-color: rgba(0, 240, 255, 0.35);
      box-shadow: 0 16px 36px -8px rgba(0, 240, 255, 0.15);
    }
    .hero-banner {
      background: linear-gradient(180deg, rgba(10, 15, 29, 0.7) 0%, rgba(10, 15, 29, 0.95) 100%),
                  url('/assets/images/c987ef7b73bbffa9.jpg') center/cover no-repeat;
      padding: 90px 0 70px;
      position: relative;
    }
    .hero-application-box {
      background: rgba(15, 23, 42, 0.85);
      border: 1px solid rgba(0, 240, 255, 0.3);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 0 20px 45px rgba(0, 0, 0, 0.7);
    }
    .spec-check-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 12px;
    }
    .spec-check-item i {
      color: var(--accent-green);
      margin-top: 4px;
    }
    .pipeline-step-node {
      border-left: 2px dashed rgba(0, 240, 255, 0.35);
      padding-left: 25px;
      position: relative;
      margin-bottom: 25px;
    }
    .pipeline-step-node::before {
      content: "";
      position: absolute;
      left: -9px;
      top: 5px;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: var(--bg-dark);
      border: 3px solid var(--primary-cyan);
    }
    .nav-pills-custom .nav-link {
      background: rgba(255, 255, 255, 0.04);
      color: var(--text-muted) !important;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 10px 22px;
      margin-right: 10px;
      margin-bottom: 10px;
    }
    .nav-pills-custom .nav-link.active {
      background: var(--primary-blue);
      color: #fff !important;
      border-color: var(--primary-cyan);
      box-shadow: 0 0 15px rgba(2, 132, 199, 0.4);
    }
    .stat-metric-card {
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
    }
    .stat-metric-card .num-val {
      font-size: 2.6rem;
      font-weight: 800;
      color: #fff;
      font-family: monospace;
      letter-spacing: -1px;
    }
    .stat-metric-card .num-val span {
      color: var(--primary-cyan);
      font-size: 1.5rem;
      font-family: sans-serif;
    }
    .pricing-card.featured {
      border: 2px solid var(--primary-cyan);
      background: linear-gradient(180deg, rgba(14, 116, 144, 0.25) 0%, rgba(30, 41, 59, 0.85) 100%);
      transform: translateY(-8px);
      box-shadow: 0 20px 45px rgba(0, 240, 255, 0.2);
    }
    .featured-tag {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: linear-gradient(90deg, #00f0ff, #0284c7);
      color: #020d1a;
      font-size: 0.75rem;
      font-weight: 800;
      padding: 3px 16px;
      border-radius: 20px;
      text-transform: uppercase;
    }
    .accordion-glass .accordion-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      margin-bottom: 14px;
      border-radius: var(--radius-sm) !important;
      overflow: hidden;
    }
    .accordion-glass .accordion-button {
      background: transparent;
      color: #fff;
      font-weight: 600;
      box-shadow: none;
      padding: 18px 22px;
    }
    .accordion-glass .accordion-button:not(.collapsed) {
      color: var(--primary-cyan);
      background: rgba(0, 240, 255, 0.05);
      border-bottom: 1px solid var(--border-color);
    }
    .accordion-glass .accordion-button::after {
      filter: invert(1);
    }
    .accordion-glass .accordion-body {
      color: var(--text-muted);
      line-height: 1.8;
      padding: 20px 22px;
    }
    .form-control-custom {
      background: rgba(15, 23, 42, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: #fff;
      border-radius: var(--radius-sm);
      padding: 12px 16px;
    }
    .form-control-custom:focus {
      background: rgba(15, 23, 42, 0.95);
      border-color: var(--primary-cyan);
      color: #fff;
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
    }
    .form-control-custom::placeholder {
      color: var(--text-sub);
    }
    footer {
      background: #050811;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      color: var(--text-sub);
      font-size: 0.9rem;
    }
    footer h5 {
      color: #fff;
      font-size: 1.05rem;
      margin-bottom: 20px;
    }
    footer ul { list-style: none; padding: 0; margin: 0; }
    footer ul li { margin-bottom: 10px; }
    footer ul li a { color: var(--text-sub); }
    footer ul li a:hover { color: var(--primary-cyan); }
    @media (max-width: 991px) {
      .hero-application-box { margin-top: 35px; }
      .section-spacing { padding: 60px 0; }
    }
    @media (max-width: 576px) {
      .section-heading h2 { font-size: 1.7rem; }
      .pricing-card.featured { transform: none; }
    }