/* roulang page: index */
:root {
      --primary: #0A6EFF;
      --primary-dark: #0856CC;
      --secondary: #1A2332;
      --accent: #FF5C00;
      --bg: #F7F9FC;
      --white: #FFFFFF;
      --border-light: #E8EDF3;
      --text-main: #1A2332;
      --text-secondary: #5C6B7E;
      --text-light: #B0B8C1;
      --shadow-sm: 0 2px 12px rgba(26,35,50,0.06);
      --shadow-md: 0 8px 24px rgba(10,110,255,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
      --transition: 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
    }
    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 700;
    }
    h3 {
      font-size: 24px;
      line-height: 1.4;
      font-weight: 600;
    }
    .text-mono {
      font-family: var(--font-mono);
    }
    .btn {
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: var(--transition);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border: 2px solid var(--primary);
    }
    .btn-primary:hover, .btn-primary:focus-visible {
      background-color: var(--primary-dark);
      border-color: var(--primary-dark);
      color: white;
      outline: none;
    }
    .btn-outline-primary {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
    }
    .btn-outline-primary:hover {
      background: rgba(10,110,255,0.08);
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-accent {
      background-color: var(--accent);
      color: white;
      border: 2px solid var(--accent);
    }
    .btn-accent:hover {
      background-color: #e04d00;
      border-color: #e04d00;
      color: white;
    }
    .card {
      border: none;
      border-radius: var(--radius-card);
      background: var(--white);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .section-padding {
      padding: 80px 0;
    }
    .bg-white-section {
      background-color: var(--white);
    }
    .navbar {
      background: white;
      border-bottom: 1px solid var(--border-light);
      padding: 0.8rem 0;
      position: sticky;
      top: 0;
      z-index: 1000;
    }
    .navbar-brand {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary) !important;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-link {
      font-size: 15px;
      color: var(--text-main) !important;
      font-weight: 500;
      margin: 0 4px;
      transition: color 0.2s;
      position: relative;
      padding: 8px 12px !important;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 12px;
      right: 12px;
      height: 2px;
      background: var(--primary);
      transform: scaleX(0);
      transition: transform 0.2s;
    }
    .nav-link:hover::after, .nav-link.active::after {
      transform: scaleX(1);
    }
    .search-box {
      border-radius: 20px;
      background: #f1f4f9;
      border: 1px solid transparent;
      padding: 8px 16px;
      font-size: 14px;
      transition: 0.2s;
    }
    .search-box:focus {
      background: white;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10,110,255,0.1);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(10,110,255,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
      margin-bottom: 1rem;
    }
    .hero-dashboard-mock {
      background: var(--white);
      border-radius: 16px;
      padding: 24px;
      box-shadow: 0 15px 30px rgba(0,0,0,0.08);
      transform: rotate(1deg);
      font-family: var(--font-mono);
    }
    .score-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent);
    }
    .feature-img {
      border-radius: 12px;
      background: #e9eef3;
      width: 100%;
      height: auto;
      object-fit: cover;
      box-shadow: 0 4px 14px rgba(0,0,0,0.04);
    }
    .pricing-card.popular {
      border: 2px solid var(--primary);
      position: relative;
    }
    .badge-popular {
      background: var(--accent);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    .accordion-button {
      font-weight: 600;
      background: white;
      box-shadow: none;
      border-radius: var(--radius-card) !important;
      padding: 1.2rem 1.5rem;
    }
    .accordion-button:not(.collapsed) {
      background-color: rgba(10,110,255,0.03);
      color: var(--primary);
    }
    .accordion-item {
      border: 1px solid var(--border-light);
      margin-bottom: 12px;
      border-radius: var(--radius-card);
    }
    footer {
      background: var(--secondary);
      color: var(--text-light);
    }
    footer a {
      color: var(--text-light);
      text-decoration: none;
    }
    footer a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .section-padding { padding: 60px 0; }
      .navbar-collapse { background: white; padding: 1rem; }
    }