/* roulang page: index */
/* :root variables & design system */
    :root {
      --primary-purple: #7B2FBE;
      --primary-purple-light: #A855F7;
      --neon-cyan: #00F0FF;
      --warm-gold: #F0B90B;
      --deep-bg: #0A0118;
      --dark-card: rgba(20, 5, 40, 0.6);
      --glass-border: rgba(168, 85, 247, 0.2);
      --glass-border-hover: rgba(168, 85, 247, 0.7);
      --text-primary: #FFFFFF;
      --text-secondary: #B0B0C0;
      --text-muted: #7A7A8C;
      --spacing-sm: 16px;
      --spacing-md: 24px;
      --spacing-lg: 40px;
      --spacing-xl: 80px;
      --spacing-xxl: 120px;
      --border-radius-lg: 24px;
      --border-radius-md: 16px;
      --border-radius-sm: 10px;
      --shadow-glow-purple: 0 12px 32px rgba(123, 47, 190, 0.4);
      --shadow-glow-cyan: 0 0 24px rgba(0, 240, 255, 0.6);
      --font-h1: 4.2rem;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      background-color: var(--deep-bg);
      color: var(--text-primary);
      font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      font-weight: 400;
      line-height: 1.5;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1240px;
      margin: 0 auto;
      padding-left: 32px;
      padding-right: 32px;
    }

    /* typography */
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.25;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 800;
      color: white;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -12px;
      width: 70px;
      height: 4px;
      background: linear-gradient(to right, var(--neon-cyan), var(--primary-purple-light));
      border-radius: 2px;
    }

    .text-gradient {
      background: linear-gradient(135deg, var(--primary-purple-light), var(--neon-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* grid & flex helpers */
    .flex { display: flex; }
    .grid { display: grid; }
    .items-center { align-items: center; }
    .justify-between { justify-content: space-between; }
    .gap-md { gap: var(--spacing-md); }
    .gap-lg { gap: var(--spacing-lg); }

    /* navigation */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 1, 24, 0.4);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      transition: background 0.4s ease;
      padding: 0 20px;
    }
    .navbar.scrolled {
      background: rgba(10, 1, 24, 0.88);
      box-shadow: 0 8px 24px rgba(0,0,0,0.4);
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
      max-width: 1240px;
      margin: 0 auto;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: white;
      background: linear-gradient(to right, #C679FF, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.5px;
      text-decoration: none;
    }
    .logo i { font-size: 2rem; background: none; -webkit-text-fill-color: var(--neon-cyan); }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }
    .nav-links a {
      color: #ddd;
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: 0.3s;
      position: relative;
      padding-bottom: 6px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      width: 0%;
      height: 2px;
      left: 0;
      bottom: 0;
      background: var(--neon-cyan);
      transition: width 0.3s;
      box-shadow: 0 0 10px var(--neon-cyan);
    }
    .nav-links a:hover::after { width: 100%; }
    .nav-cta {
      padding: 10px 24px;
      background: linear-gradient(145deg, var(--primary-purple), var(--primary-purple-light));
      border-radius: 50px;
      color: white !important;
      font-weight: 600;
      box-shadow: 0 0 18px rgba(168,85,247,0.7);
      transition: 0.3s;
    }
    .nav-cta:hover { transform: scale(1.05); }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
    }

    /* Buttons */
    .btn-primary {
      background: linear-gradient(145deg, #7B2FBE, #A855F7);
      color: white;
      font-weight: 700;
      padding: 15px 40px;
      border-radius: 60px;
      border: none;
      cursor: pointer;
      font-size: 1.1rem;
      box-shadow: 0 0 28px rgba(168,85,247,0.8);
      transition: all 0.3s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover { box-shadow: 0 0 40px rgba(168,85,247,1); transform: scale(1.04); }
    .btn-outline {
      background: transparent;
      border: 1.8px solid var(--neon-cyan);
      color: var(--neon-cyan);
      font-weight: 600;
      padding: 15px 40px;
      border-radius: 60px;
      cursor: pointer;
      transition: 0.3s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover { background: rgba(0,240,255,0.1); box-shadow: 0 0 24px rgba(0,240,255,0.5); }

    /* Hero section */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: radial-gradient(circle at 30% 40%, #1D0B3A 0%, #0A0118 80%);
      position: relative;
      overflow: hidden;
      flex-direction: column;
      text-align: center;
      padding: 0 20px;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 160%;
      height: 160%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400"><path d="M200 0 L300 130 L230 300 L170 210 L60 270 L140 80 Z" fill="none" stroke="%23A855F7" stroke-width="1.2" opacity="0.25"/></svg>') repeat;
      animation: drift 15s infinite;
      pointer-events: none;
    }
    .hero h1 {
      font-size: clamp(2.8rem, 7vw, 5rem);
      font-weight: 900;
      background: linear-gradient(to right, #E9BFFF, #A855F7, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      z-index: 5;
      margin-bottom: 18px;
    }
    .hero .sub {
      font-size: 1.3rem;
      color: #C8C8D0;
      max-width: 680px;
      margin: 0 auto 36px;
      z-index: 5;
    }
    .hero-actions { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; z-index: 5; }

    /* Neon cards components */
    .glass-card {
      background: var(--dark-card);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-md);
      padding: 2rem;
      transition: all 0.3s;
    }
    .glass-card:hover {
      border-color: var(--glass-border-hover);
      box-shadow: 0 0 28px rgba(168,85,247,0.5);
      transform: translateY(-6px);
    }

    .data-number {
      font-family: 'Rajdhani', sans-serif;
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--neon-cyan);
      line-height: 1;
    }
    .service-icon { color: var(--neon-cyan); font-size: 2.2rem; }

    /* Responsive overflow and swiper styling */
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero h1 { font-size: 2.9rem; }
      .section-title { font-size: 2rem; }
      .grid-cols-2, .grid-cols-3 { grid-template-columns: 1fr; }
    }