/* roulang page: index */
:root {
      --primary: #00D084;
      --primary-hover: #00B572;
      --dark-teal: #0F4C5C;
      --bg-dark: #0B1319;
      --bg-light: #F4F7F6;
      --card-bg: #FFFFFF;
      --text-dark: #111827;
      --text-muted: #4B5563;
      --text-subtle: #9CA3AF;
      --border-color: rgba(15, 76, 92, 0.1);
      --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
      --card-shadow-hover: 0 16px 40px rgba(0, 208, 132, 0.14);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-dark);
      background-color: #FFFFFF;
      line-height: 1.65;
      overflow-x: hidden;
      font-size: 16px;
    }

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

    /* TopBar */
    .top-bar {
      height: 38px;
      background: var(--bg-dark);
      color: #D1D5DB;
      font-size: 0.825rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      align-items: center;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      display: inline-block;
      margin-right: 6px;
      box-shadow: 0 0 8px var(--primary);
    }

    /* Sticky Header */
    .main-nav-wrapper {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }
    .navbar {
      padding: 0.85rem 0;
    }
    .brand-logo {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--dark-teal);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      letter-spacing: -0.5px;
    }
    .brand-logo i {
      color: var(--primary);
      font-size: 1.6rem;
    }
    .nav-link {
      font-weight: 500;
      color: #374151 !important;
      padding: 0.5rem 1rem !important;
      font-size: 0.95rem;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--dark-teal) !important;
      font-weight: 600;
    }
    .btn-brand {
      background: var(--primary);
      color: #07271F;
      font-weight: 700;
      border-radius: var(--radius-sm);
      padding: 0.65rem 1.6rem;
      border: 1px solid var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      transition: all 0.25s ease;
    }
    .btn-brand:hover {
      background: var(--primary-hover);
      color: #031511;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(0, 208, 132, 0.3);
    }
    .btn-outline-brand {
      border: 1.5px solid var(--dark-teal);
      color: var(--dark-teal);
      background: transparent;
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 0.65rem 1.5rem;
    }
    .btn-outline-brand:hover {
      background: var(--dark-teal);
      color: #FFFFFF;
    }

    /* Section Typography */
    .section-padding {
      padding: 5.5rem 0;
    }
    .section-pill {
      display: inline-flex;
      align-items: center;
      padding: 0.3rem 0.85rem;
      background: rgba(0, 208, 132, 0.12);
      color: #065F46;
      border-radius: 50px;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      margin-bottom: 0.85rem;
      text-transform: uppercase;
    }
    .section-title {
      font-size: clamp(1.8rem, 3.2vw, 2.5rem);
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.5px;
      line-height: 1.25;
      margin-bottom: 1rem;
    }
    .section-lead {
      color: var(--text-muted);
      font-size: 1.05rem;
      line-height: 1.7;
      max-width: 760px;
      margin-bottom: 2.5rem;
    }

    /* Hero Section (API / Dev Bento Layout) */
    .hero-section {
      background: linear-gradient(175deg, #F8FAFB 0%, #EBF4F2 100%);
      padding: 4.5rem 0 5.5rem;
      position: relative;
      overflow: hidden;
    }
    .hero-h1 {
      font-size: clamp(2.3rem, 4.5vw, 3.6rem);
      font-weight: 800;
      line-height: 1.18;
      color: var(--bg-dark);
      margin-bottom: 1.25rem;
    }
    .hero-p {
      font-size: 1.1rem;
      line-height: 1.75;
      color: var(--text-muted);
      margin-bottom: 2rem;
    }
    .hero-terminal {
      background: #0D161F;
      border-radius: var(--radius-md);
      box-shadow: 0 25px 60px rgba(11, 19, 25, 0.25);
      border: 1px solid rgba(255, 255, 255, 0.1);
      overflow: hidden;
      font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    }
    .terminal-header {
      background: #15222E;
      padding: 0.75rem 1rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .t-dot {
      width: 11px;
      height: 11px;
      border-radius: 50%;
      display: inline-block;
    }
    .t-red { background: #FF5F56; }
    .t-yellow { background: #FFBD2E; }
    .t-green { background: #27C93F; }
    .terminal-body {
      padding: 1.25rem;
      color: #A7F3D0;
      font-size: 0.85rem;
      line-height: 1.6;
    }
    .t-keyword { color: #60A5FA; }
    .t-str { color: #FCD34D; }
    .t-comment { color: #6B7280; }

    /* Custom Cards */
    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 2rem 1.75rem;
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(0, 208, 132, 0.4);
    }
    .icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: rgba(0, 208, 132, 0.12);
      color: var(--dark-teal);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 1.25rem;
    }

    /* Product Cards */
    .product-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }
    .product-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .product-img-wrap {
      height: 210px;
      position: relative;
      overflow: hidden;
      background: #E5E7EB;
    }
    .product-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-card:hover .product-img-wrap img {
      transform: scale(1.05);
    }

    /* Dark Case / Concept Section */
    .dark-section {
      background: radial-gradient(circle at 80% 20%, #152C33 0%, var(--bg-dark) 70%);
      color: #F9FAFB;
      position: relative;
    }
    .dark-section .section-title {
      color: #FFFFFF;
    }
    .dark-section .section-lead {
      color: #9CA3AF;
    }
    .dark-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      padding: 2rem;
      backdrop-filter: blur(10px);
    }

    /* Scenarios Grid */
    .scenario-item {
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 1.75rem;
      background: #FFFFFF;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      height: 100%;
    }
    .scenario-item:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
    }

    /* Metrics Strip */
    .metric-box {
      border-right: 1px solid rgba(255, 255, 255, 0.12);
      padding: 1.5rem 1rem;
    }
    .metric-box:last-child {
      border-right: none;
    }
    .metric-val {
      font-size: clamp(2.2rem, 3.8vw, 3.2rem);
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 0.5rem;
      font-family: SFMono-Regular, Menlo, Monaco, monospace;
    }

    /* Flow Step */
    .flow-step-num {
      width: 42px;
      height: 42px;
      background: var(--dark-teal);
      color: var(--primary);
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1rem;
      font-size: 1.1rem;
    }

    /* Testimonials */
    .quote-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--card-shadow);
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    /* Accordion override */
    .accordion-button:not(.collapsed) {
      color: var(--dark-teal);
      background-color: rgba(0, 208, 132, 0.08);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: rgba(0, 208, 132, 0.3);
    }
    .accordion-item {
      border-radius: var(--radius-sm) !important;
      margin-bottom: 0.85rem;
      border: 1px solid var(--border-color);
      overflow: hidden;
    }

    /* Form Container */
    .inquiry-panel {
      background: linear-gradient(135deg, #0F4C5C 0%, #082932 100%);
      color: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 3.5rem 2.5rem;
      box-shadow: 0 20px 50px rgba(15, 76, 92, 0.25);
    }

    /* Footer */
    footer {
      background: var(--bg-dark);
      color: #9CA3AF;
      padding: 4.5rem 0 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }
    footer h6 {
      color: #FFFFFF;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    footer ul li {
      margin-bottom: 0.65rem;
    }
    footer ul li a:hover {
      color: var(--primary);
    }
    .footer-divider {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin: 3rem 0 1.5rem;
    }

    @media (max-width: 991px) {
      .metric-box {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      }
    }