/* roulang page: index */
:root {
      --primary: #F0853F;
      --primary-light: #F2A68D;
      --primary-dark: #C96A2E;
      --secondary: #1B3A3A;
      --bg: #FEFAF6;
      --card: #FFFFFF;
      --text: #1B3A3A;
      --muted: #6B6B6B;
      --border-light: #E8E3DE;
      --shadow-sm: 0 8px 30px rgba(27, 58, 58, 0.06);
      --shadow-md: 0 16px 40px rgba(27, 58, 58, 0.10);
      --radius-lg: 24px;
      --radius-md: 20px;
      --radius-sm: 14px;
      --radius-pill: 50px;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.75;
      font-weight: 400;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    h2 {
      font-size: 2.25rem;
      margin-bottom: 1rem;
    }
    h3 {
      font-weight: 600;
      font-size: 1.35rem;
    }
    .section-title {
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: linear-gradient(to right, var(--primary), var(--primary-light));
      border-radius: 4px;
    }
    .text-muted-custom {
      color: var(--muted);
    }
    .bg-primary-gradient {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    }
    .btn {
      border-radius: var(--radius-pill);
      padding: 0.75rem 2.25rem;
      font-weight: 600;
      transition: var(--transition);
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 2px solid transparent;
    }
    .btn-primary-custom {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      color: white;
      border: none;
      box-shadow: 0 6px 18px rgba(240, 133, 63, 0.35);
    }
    .btn-primary-custom:hover {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
      box-shadow: 0 12px 28px rgba(240, 133, 63, 0.5);
      transform: scale(1.03);
      color: white;
    }
    .btn-outline-secondary {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
    }
    .btn-outline-secondary:hover {
      background: rgba(27, 58, 58, 0.08);
      border-color: var(--secondary);
      color: var(--secondary);
    }
    .btn-sm-nav {
      padding: 0.5rem 1.5rem;
      font-size: 0.9rem;
      border-radius: 30px;
    }
    .card {
      border: none;
      border-radius: var(--radius-md);
      background: var(--card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      padding: 2rem;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-6px);
    }
    .navbar {
      background: #FFFFFF;
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      border-bottom: 1px solid var(--border-light);
      padding: 0.75rem 0;
    }
    .navbar-brand {
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--secondary) !important;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar-brand img {
      width: 28px;
      height: 28px;
    }
    .nav-link {
      color: var(--secondary) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      bottom: 0;
      left: 50%;
      background: var(--primary);
      transition: all 0.3s ease;
      transform: translateX(-50%);
    }
    .nav-link:hover {
      color: var(--primary) !important;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .search-box {
      background: var(--bg);
      border-radius: 30px;
      border: 1px solid var(--border-light);
      padding: 0.4rem 1rem;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 0.9rem;
      width: 120px;
    }
    .navbar-toggler {
      border: none;
      color: var(--secondary);
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    @media (max-width: 991px) {
      .navbar-collapse {
        background: white;
        padding: 1.5rem;
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-md);
        margin-top: 1rem;
      }
    }
    .hero-bg {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-content-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 3rem;
      box-shadow: 0 30px 50px rgba(27,58,58,0.15);
      max-width: 900px;
      margin: 2rem auto;
      position: relative;
      z-index: 2;
    }
    .badge-stat {
      background: rgba(240,133,63,0.08);
      color: var(--primary-dark);
      font-weight: 700;
      font-size: 2rem;
      font-family: 'Inter', sans-serif;
      border-radius: var(--radius-sm);
      padding: 0.5rem 1.2rem;
    }
    .pain-card {
      background: #F5F0EB;
      border-left: 6px solid #C96A2E;
    }
    .solution-card {
      background: white;
      border-left: 6px solid var(--primary);
    }
    .advantage-icon {
      width: 64px;
      height: 64px;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 28px;
      margin-bottom: 1.5rem;
    }
    .process-step {
      text-align: center;
      position: relative;
    }
    .step-number {
      width: 50px;
      height: 50px;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.4rem;
      margin: 0 auto 1rem;
    }
    .testimonial-card {
      border-left: 5px solid var(--primary);
      background: white;
    }
    .accordion-button {
      background: var(--bg);
      border-radius: var(--radius-sm) !important;
      font-weight: 600;
      color: var(--secondary);
      box-shadow: none;
      padding: 1.25rem;
      font-size: 1.1rem;
    }
    .accordion-button:not(.collapsed) {
      background: white;
      color: var(--primary);
      border-left: 5px solid var(--primary);
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--primary);
    }
    .cta-section {
      background: var(--secondary);
      border-radius: var(--radius-lg);
      padding: 4rem 2rem;
    }
    footer {
      background: var(--secondary);
      color: rgba(255,255,255,0.8);
    }
    footer a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
    }
    footer a:hover {
      color: var(--primary);
    }
    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.9rem; }
      .hero-content-card { padding: 2rem; }
    }