/* roulang page: index */
:root {
      --primary: #0B3D5F;
      --primary-deep: #072D45;
      --accent: #E85D04;
      --accent-hover: #C94D00;
      --highlight: #00A896;
      --bg-light: #F7F9FC;
      --bg-white: #FFFFFF;
      --text-main: #2C3E50;
      --text-muted: #5D6D7E;
      --border-light: rgba(11, 61, 95, 0.08);
      --shadow-sm: 0 2px 12px rgba(11, 61, 95, 0.06);
      --shadow-hover: 0 8px 24px rgba(11, 61, 95, 0.12);
      --radius-card: 12px;
      --radius-btn: 50px;
      --radius-input: 8px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-heading);
      color: var(--primary);
      letter-spacing: -0.02em;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
      position: relative;
    }
    .section-title::after {
      content: "";
      display: block;
      width: 50px;
      height: 3px;
      background: var(--accent);
      margin-top: 0.5rem;
    }
    .section-title.text-center::after {
      margin-left: auto;
      margin-right: auto;
    }
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-muted);
      font-weight: 400;
      max-width: 700px;
      margin: 0 auto 2rem;
    }
    .bg-primary-deep {
      background: linear-gradient(135deg, #072D45 0%, #0B3D5F 100%);
    }
    .btn-primary-accent {
      background: var(--accent);
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(232, 93, 4, 0.25);
    }
    .btn-primary-accent:hover, .btn-primary-accent:focus {
      background: var(--accent-hover);
      color: white;
      transform: scale(1.03);
      box-shadow: 0 6px 16px rgba(232, 93, 4, 0.4);
    }
    .btn-outline-primary {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline-primary:hover {
      background: var(--primary);
      color: white;
    }
    .navbar {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
      padding: 0.75rem 0;
      transition: var(--transition);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary) !important;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar-brand i {
      font-size: 1.8rem;
      color: var(--accent);
    }
    .nav-link {
      color: var(--primary) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      position: relative;
      transition: 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: 0.25s ease;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 70%;
    }
    .nav-link:hover {
      color: var(--accent) !important;
    }
    .navbar .btn-pill {
      padding: 8px 22px;
      font-size: 0.9rem;
      margin-left: 12px;
    }
    .hero-section {
      background: linear-gradient(135deg, #F7F9FC 0%, #E8EFF5 100%);
      padding: 6rem 0 4rem;
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.25;
    }
    .hero-img {
      border-radius: 16px;
      box-shadow: var(--shadow-hover);
      max-width: 100%;
      height: auto;
    }
    .feature-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      border: 1px solid var(--border-light);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2.5rem;
      color: var(--accent);
      margin-bottom: 1.2rem;
      display: inline-block;
      background: rgba(232,93,4,0.08);
      padding: 12px;
      border-radius: 50%;
    }
    .scenario-img {
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .tag-badge {
      background: rgba(11,61,95,0.07);
      color: var(--primary);
      font-weight: 500;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      margin-right: 6px;
      display: inline-block;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .partner-logo-placeholder {
      background: #EAEEF2;
      border-radius: 12px;
      padding: 20px 10px;
      text-align: center;
      color: #4A5C6B;
      font-weight: 500;
      filter: grayscale(100%);
      transition: 0.3s;
      cursor: default;
    }
    .partner-logo-placeholder:hover {
      filter: grayscale(0%);
      background: #dce3ea;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }
    .pricing-card.recommended {
      border: 2px solid var(--highlight);
      box-shadow: 0 10px 25px rgba(0,168,150,0.1);
    }
    .recommended-badge {
      background: var(--accent);
      color: white;
      padding: 3px 14px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    .accordion-button:not(.collapsed) {
      background-color: rgba(11,61,95,0.03);
      color: var(--primary);
      box-shadow: none;
      border-left: 4px solid var(--accent);
      font-weight: 600;
    }
    .accordion-button {
      font-weight: 600;
      background: #F7F9FC;
      border-radius: 8px !important;
      margin-bottom: 8px;
      transition: 0.2s;
      box-shadow: none;
    }
    .accordion-item {
      border: none;
      background: transparent;
    }
    .footer-link {
      color: rgba(255,255,255,0.8);
      text-decoration: none;
      transition: 0.2s;
    }
    .footer-link:hover {
      color: var(--accent);
      text-decoration: underline;
    }
    .form-control-custom {
      background: white;
      border: none;
      border-radius: var(--radius-input);
      padding: 12px 16px;
      box-shadow: inset 0 1px 4px rgba(0,0,0,0.08);
      transition: 0.2s;
    }
    .form-control-custom:focus {
      box-shadow: 0 0 0 3px rgba(232,93,4,0.2);
      outline: none;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.8rem;
      }
      .navbar-collapse {
        background: white;
        padding: 1rem;
        border-radius: 12px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      }
    }