/* roulang page: index */
:root {
      --bg-dark: #0D1117;
      --bg-light: #FFFFFF;
      --bg-soft: #F4F6F9;
      --bg-mute: #E9ECEF;
      --primary: #00B074;
      --primary-hover: #009663;
      --navy: #1E293B;
      --accent: #FF6B00;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: rgba(0, 0, 0, 0.08);
      --radius: 8px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
      --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.12);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.6;
      scroll-behavior: smooth;
    }

    .num-metric {
      font-family: "DIN Alternate", "Roboto Mono", monospace, sans-serif;
      font-weight: 700;
    }

    /* Topbar & Navbar */
    .site-topbar {
      background: #080b0f;
      color: #94A3B8;
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .site-navbar {
      background: rgba(13, 17, 23, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      transition: all 0.3s ease;
    }
    .navbar-brand {
      font-size: 20px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: #FFFFFF !important;
    }
    .navbar-brand span {
      color: var(--primary);
    }
    .nav-link {
      color: #CBD5E1 !important;
      font-size: 15px;
      font-weight: 500;
      padding: 8px 14px !important;
      transition: color 0.2s ease;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
    }

    /* Common Components */
    .btn-brand {
      background-color: var(--primary);
      color: #FFFFFF;
      font-weight: 600;
      border-radius: var(--radius);
      padding: 10px 22px;
      border: 1px solid var(--primary);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      min-height: 44px;
    }
    .btn-brand:hover {
      background-color: var(--primary-hover);
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(0, 176, 116, 0.3);
    }
    .btn-outline-brand {
      border: 1px solid rgba(255, 255, 255, 0.3);
      color: #FFFFFF;
      background: transparent;
      padding: 10px 22px;
      font-weight: 600;
      border-radius: var(--radius);
      transition: all 0.25s ease;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline-brand:hover {
      background: rgba(255, 255, 255, 0.1);
      color: #FFFFFF;
      border-color: #FFFFFF;
    }
    .section-badge {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--primary);
      background: rgba(0, 176, 116, 0.1);
      padding: 4px 12px;
      border-radius: 40px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--navy);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
      max-width: 780px;
      margin-bottom: 0;
    }

    /* Section Padding & Alternating */
    section {
      position: relative;
    }
    .py-plate {
      padding-top: 80px;
      padding-bottom: 80px;
    }
    .bg-soft-plate {
      background-color: var(--bg-soft);
    }
    .bg-dark-plate {
      background-color: var(--bg-dark);
      color: #FFFFFF;
    }

    /* Custom Cards */
    .pro-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      height: 100%;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    }
    .pro-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 176, 116, 0.4);
    }
    .icon-box {
      width: 52px;
      height: 52px;
      border-radius: 10px;
      background: rgba(0, 176, 116, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
    }

    /* Hero Block */
    .hero-section {
      background: linear-gradient(180deg, #0D1117 0%, #161F2E 100%);
      color: #FFFFFF;
      padding-top: 70px;
      padding-bottom: 90px;
      position: relative;
      overflow: hidden;
    }
    .hero-assessment-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.12);
      backdrop-filter: blur(16px);
      border-radius: 12px;
      padding: 30px;
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
    }

    /* Timeline step */
    .step-box {
      position: relative;
      padding: 24px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      height: 100%;
    }
    .step-number {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 12px;
      line-height: 1;
    }

    /* Accordion Redesign */
    .accordion-item {
      border: 1px solid var(--border-color);
      margin-bottom: 12px;
      border-radius: var(--radius) !important;
      overflow: hidden;
    }
    .accordion-button {
      font-weight: 600;
      color: var(--navy);
      background-color: #FFFFFF;
      padding: 18px 22px;
      box-shadow: none !important;
    }
    .accordion-button:not(.collapsed) {
      color: var(--primary);
      background-color: rgba(0, 176, 116, 0.05);
    }
    .accordion-body {
      padding: 20px 24px;
      color: var(--text-muted);
      line-height: 1.8;
      background: #FFFFFF;
    }

    /* Footer */
    .site-footer {
      background: #090D12;
      color: #94A3B8;
      padding-top: 70px;
      padding-bottom: 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 14px;
    }
    .site-footer h6 {
      color: #FFFFFF;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }
    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94A3B8;
      text-decoration: none;
      transition: color 0.2s ease;
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 25px;
      margin-top: 50px;
      font-size: 13px;
    }

    @media (max-width: 991px) {
      .section-title { font-size: 26px; }
      .py-plate { padding-top: 60px; padding-bottom: 60px; }
    }