/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --card-bg: #1A1F3A;
      --cyan: #00F0FF;
      --pink: #FF3CAC;
      --light-bg: #F0F2FF;
      --text-white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-gray: #B0B8D1;
      --text-muted: #6B7294;
      --green: #00E676;
      --gradient-main: linear-gradient(135deg, #00F0FF 0%, #FF3CAC 100%);
      --gradient-dark: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      --shadow-glow: 0 10px 25px -5px rgba(0, 240, 255, 0.15);
      --border-radius-lg: 24px;
      --border-radius-md: 16px;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background-color: var(--deep-blue);
      color: var(--text-white);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, .font-display {
      font-family: 'Rajdhani', 'Inter', 'PingFang SC', sans-serif;
      letter-spacing: -0.02em;
    }
    .gradient-text {
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .glow-shadow {
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.3);
    }
    .card-hover {
      transition: var(--transition-smooth);
      background-color: var(--card-bg);
      border-radius: var(--border-radius-md);
    }
    .card-hover:hover {
      transform: translateY(-10px);
      box-shadow: 0 25px 35px -10px rgba(0, 240, 255, 0.25);
      background-color: #222842;
    }
    .btn-primary {
      background: var(--gradient-main);
      color: white;
      font-weight: 600;
      border-radius: 9999px;
      padding: 0.75rem 2rem;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
      border: none;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 8px 25px rgba(0, 240, 255, 0.5);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      border-radius: 9999px;
      padding: 0.7rem 1.8rem;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: var(--cyan);
      color: var(--deep-blue);
      border-color: var(--cyan);
    }
    .text-link {
      color: var(--cyan);
      font-weight: 500;
      transition: color 0.2s;
      cursor: pointer;
      text-decoration: none;
    }
    .text-link:hover {
      color: var(--pink);
      text-decoration: underline;
    }
    .section-padding {
      padding: 5rem 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 3rem 0;
      }
    }
    .decorative-line {
      width: 80px;
      height: 4px;
      background: var(--gradient-main);
      border-radius: 4px;
      margin: 0.8rem 0 2rem;
    }
    .center-line {
      margin-left: auto;
      margin-right: auto;
    }
    nav a.active {
      color: var(--cyan);
      position: relative;
    }
    nav a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--cyan);
      border-radius: 2px;
      box-shadow: 0 0 8px var(--cyan);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(10, 14, 39, 0.98);
      backdrop-filter: blur(12px);
      z-index: 100;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2.5rem;
      font-size: 1.5rem;
      transition: opacity 0.3s ease;
    }
    .mobile-menu.active {
      display: flex;
    }
    @media (min-width: 769px) {
      .mobile-menu, .menu-toggle {
        display: none !important;
      }
    }
    input, button {
      font-family: inherit;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
      background-color: rgba(26, 31, 58, 0.5);
      border-radius: 12px;
      margin-top: 0.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 1rem 1.5rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(90deg);
      color: var(--pink);
    }
    .stat-number {
      font-family: 'Rajdhani', sans-serif;
      font-weight: 700;
    }
    footer a {
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--cyan);
    }