/* roulang page: index */
:root {
      --primary: #0A2E4F;
      --primary-light: #1B6B93;
      --accent: #F5A623;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-main: #1E293B;
      --text-secondary: #475569;
      --success: #10B981;
      --danger: #EF4444;
      --radius-xl: 1rem;
      --shadow-card: 0 10px 25px -5px rgba(10, 46, 79, 0.08), 0 8px 10px -6px rgba(10, 46, 79, 0.03);
      --shadow-hover: 0 20px 30px -10px rgba(10, 46, 79, 0.12), 0 10px 15px -8px rgba(10, 46, 79, 0.06);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      margin: 0;
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 640px) {
      .container-custom {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    .nav-blur {
      background: rgba(10, 46, 79, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .btn-primary {
      background-color: var(--primary);
      color: white;
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: 0.75rem;
      box-shadow: 0 4px 10px rgba(10,46,79,0.25);
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background-color: var(--primary-light);
      box-shadow: 0 8px 18px rgba(10,46,79,0.3);
      transform: scale(1.02);
    }
    .btn-outline {
      border: 2px solid var(--primary-light);
      color: var(--primary-light);
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: 0.75rem;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background-color: var(--primary-light);
      color: white;
    }
    .btn-accent {
      background-color: var(--accent);
      color: var(--primary);
      font-weight: 700;
      padding: 0.75rem 2rem;
      border-radius: 0.75rem;
      box-shadow: 0 8px 18px rgba(245,166,35,0.35);
      transition: all 0.2s ease;
    }
    .btn-accent:hover {
      background-color: #e6951a;
      transform: translateY(-2px);
      box-shadow: 0 14px 24px rgba(245,166,35,0.45);
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-card);
      padding: 2rem;
      transition: box-shadow 0.3s ease, transform 0.2s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .pain-card {
      border-left: 5px solid var(--danger);
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.02em;
      margin-bottom: 0.75rem;
    }
    @media (min-width: 768px) {
      .section-title {
        font-size: 2.5rem;
      }
    }
    .highlight-number {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.1;
      color: white;
    }
    @media (min-width: 768px) {
      .highlight-number {
        font-size: 3.8rem;
      }
    }
    .faq-item {
      border-bottom: 1px solid rgba(10,46,79,0.1);
      padding: 1.25rem 0;
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.2s;
      color: var(--text-secondary);
      padding-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 0.75rem;
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: rgba(10,46,79,0.98);
      backdrop-filter: blur(16px);
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      padding: 1.5rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .mobile-menu.open {
      display: flex;
    }
    @media (min-width: 768px) {
      .mobile-menu {
        display: none !important;
      }
    }
    .decor-line {
      background: linear-gradient(90deg, var(--primary-light), transparent);
      height: 2px;
      width: 70px;
      margin: 0.5rem 0 2rem;
    }
    .bg-data-dark {
      background-color: #0A2E4F;
      background-image: radial-gradient(circle at 20% 30%, rgba(27,107,147,0.15) 0%, transparent 40%);
    }
    .image-placeholder {
      background-color: #e2e8f0;
      border-radius: 1rem;
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
    }