/* roulang page: index */
:root {
      --bg-deep: #0A0E27;
      --bg-darker: #060B1A;
      --gold: #D4A843;
      --gold-light: #F0C96D;
      --gold-gradient: linear-gradient(135deg, #D4A843 0%, #F0C96D 100%);
      --cyan-data: #00C9C8;
      --red-alert: #E74C3C;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-bg: rgba(255, 255, 255, 0.06);
      --glass-hover-border: rgba(255, 255, 255, 0.15);
      --text-primary: rgba(255, 255, 255, 0.92);
      --text-secondary: rgba(255, 255, 255, 0.7);
      --text-muted: rgba(255, 255, 255, 0.5);
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: 'Inter', 'SF Pro Display', system-ui;
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 10px;
      --shadow-gold: 0 0 25px rgba(212, 168, 67, 0.4), 0 0 50px rgba(212, 168, 67, 0.1);
      --shadow-gold-hover: 0 0 35px rgba(212, 168, 67, 0.6), 0 0 70px rgba(212, 168, 67, 0.2);
      --transition-smooth: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --transition-fast: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

    .font-mono {
      font-family: var(--font-mono);
    }

    .text-gold-gradient {
      background: var(--gold-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .bg-gold-gradient {
      background: var(--gold-gradient);
    }

    .text-cyan {
      color: var(--cyan-data);
    }

    .text-gold {
      color: var(--gold-light);
    }

    .border-gold {
      border-color: var(--gold);
    }

    .glass-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: var(--radius-lg);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
      transition: background var(--transition-smooth), border var(--transition-smooth), transform var(--transition-fast);
    }

    .glass-card:hover {
      background: var(--glass-hover-bg);
      border-color: var(--glass-hover-border);
    }

    .btn-primary {
      background: var(--gold-gradient);
      color: #0A0E27;
      font-weight: 600;
      border-radius: 12px;
      padding: 14px 32px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-gold);
      transition: all var(--transition-fast);
      border: none;
      cursor: pointer;
      letter-spacing: 0.5px;
      font-size: 1rem;
    }

    .btn-primary:hover {
      box-shadow: var(--shadow-gold-hover);
      transform: translateY(-2px);
    }

    .btn-outline-gold {
      background: transparent;
      border: 1px solid var(--gold);
      color: var(--gold-light);
      border-radius: 12px;
      padding: 14px 32px;
      font-weight: 500;
      transition: all var(--transition-fast);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
    }

    .btn-outline-gold:hover {
      background: rgba(212, 168, 67, 0.1);
      border-color: var(--gold-light);
      color: var(--gold-light);
      transform: translateY(-2px);
    }

    .nav-link {
      color: var(--text-secondary);
      position: relative;
      transition: color var(--transition-fast);
      font-weight: 500;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--gold-light);
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 50%;
      transform: translateX(-50%);
      width: 6px;
      height: 6px;
      background: var(--gold-light);
      border-radius: 50%;
    }

    .mobile-menu {
      transition: transform 0.3s ease, opacity 0.3s ease;
      transform: translateY(-10px);
      opacity: 0;
      pointer-events: none;
    }

    .mobile-menu.open {
      transform: translateY(0);
      opacity: 1;
      pointer-events: auto;
    }

    .faq-answer {
      display: grid;
      grid-template-rows: 0fr;
      transition: grid-template-rows 0.4s ease;
    }

    .faq-answer.open {
      grid-template-rows: 1fr;
    }

    .faq-answer-inner {
      overflow: hidden;
    }

    .faq-icon {
      transition: transform 0.3s ease;
      color: var(--gold-light);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .hero-dashboard-img {
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 20px;
      transition: transform 0.3s ease;
    }

    .hero-dashboard-img:hover {
      transform: translateY(-8px);
    }

    .comparison-col-left {
      background: rgba(231, 76, 60, 0.08);
      border: 1px solid rgba(231, 76, 60, 0.25);
    }

    .comparison-col-right {
      background: rgba(212, 168, 67, 0.08);
      border: 1px solid rgba(212, 168, 67, 0.35);
    }

    .input-field {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 12px;
      padding: 14px 18px;
      color: white;
      transition: all 0.3s ease;
      width: 100%;
      font-size: 1rem;
    }

    .input-field:focus {
      outline: none;
      border-color: var(--gold);
      box-shadow: 0 0 15px rgba(212, 168, 67, 0.25);
      background: rgba(255, 255, 255, 0.08);
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-10px); }
      100% { transform: translateY(0px); }
    }

    .animate-float {
      animation: float 6s ease-in-out infinite;
    }