:root {
      --bg: #0a0f1e;
      --card: rgba(20, 28, 48, 0.65);
      --text: #e0e7ff;
      --muted: #94a3b8;
      --accent: #00d4ff;
      --accent-dark: #0099cc;
      --gradient: linear-gradient(135deg, var(--accent), var(--accent-dark));
      --blur: blur(20px);
    }
    [data-theme="light"] {
      --bg: #f0f4ff;
      --card: rgba(255, 255, 255, 0.85);
      --text: #1e293b;
      --muted: #64748b;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: 'Inter', system-ui, sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      transition: background 0.4s ease;
      overflow-x: hidden;
    }
    /* ===== HERO ===== */
    header {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
      background: linear-gradient(rgba(10, 15, 30, 0.85), rgba(10, 15, 30, 0.85)),
                  url('bgg2.jpg') center/cover no-repeat;
      color: white;
      padding: 0 20px;
    }
    .hero-content {
      max-width: 900px;
      padding: 50px 30px;
      border-radius: 28px;
      background: rgba(15, 25, 50, 0.4);
      backdrop-filter: var(--blur);
      border: 1px solid rgba(0, 212, 255, 0.2);
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-15px); }
    }
    header h1 {
      font-size: clamp(40px, 8vw, 72px);
      font-weight: 800;
      margin-bottom: 16px;
      background: linear-gradient(90deg, #fff, var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    header p {
      font-size: clamp(18px, 3vw, 22px);
      max-width: 700px;
      margin: 0 auto 40px;
      opacity: 0.9;
    }
    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
      justify-content: center;
      margin-bottom: 20px;
    }
    .btn {
      padding: 16px 32px;
      border-radius: 16px;
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      gap: 10px;
    }
    .btn-primary {
      background: var(--gradient);
      color: #000;
      box-shadow: 0 8px 25px rgba(0, 212, 255, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-4px);
      box-shadow: 0 15px 35px rgba(0, 212, 255, 0.4);
    }
    .btn-glass {
      background: rgba(255,255,255,0.1);
      backdrop-filter: var(--blur);
      border: 1px solid rgba(255,255,255,0.15);
      color: white;
    }
    .btn-glass:hover {
      background: rgba(255,255,255,0.2);
      transform: translateY(-3px);
    }
    /* ===== THEME TOGGLE ===== */
    .theme-toggle {
      position: fixed;
      top: 24px;
      right: 24px;
      z-index: 1000;
      background: var(--card);
      backdrop-filter: var(--blur);
      padding: 12px;
      border-radius: 16px;
      cursor: pointer;
      font-size: 24px;
      border: 1px solid rgba(0,212,255,0.2);
      transition: all 0.3s;
    }
    .theme-toggle:hover { transform: scale(1.1); }
    /* ===== SECTIONS ===== */
    section {
      max-width: 1200px;
      margin: 0 auto;
      padding: 100px 20px;
    }
    h2 {
      font-size: 40px;
      text-align: center;
      margin-bottom: 60px;
      font-weight: 700;
      background: linear-gradient(90deg, var(--text), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
    }
    .card {
      background: var(--card);
      backdrop-filter: var(--blur);
      padding: 32px;
      border-radius: 24px;
      border: 1px solid rgba(0,212,255,0.15);
      box-shadow: 0 15px 40px rgba(0,0,0,0.2);
      transition: all 0.5s ease;
      opacity: 0;
      transform: translateY(50px);
    }
    .card.visible {
      opacity: 1;
      transform: translateY(0);
    }
    .card:hover {
      transform: translateY(-10px);
      box-shadow: 0 25px 60px rgba(0,212,255,0.15);
    }
    .item {
      display: flex;
      align-items: center;
      gap: 20px;
      font-size: 18px;
    }
    .icon {
      width: 56px;
      height: 56px;
      background: var(--gradient);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      color: #000;
      flex-shrink: 0;
    }
    .link-card {
      text-decoration: none;
      color: inherit;
      display: block;
    }
    .link-card .item div strong {
      font-size: 20px;
      display: block;
      margin-bottom: 6px;
    }
    .link-card small {
      color: var(--muted);
    }
    footer {
      padding: 80px 20px;
      text-align: center;
      font-size: 15px;
      opacity: 0.7;
    }
    @media (max-width: 768px) {
      .hero-buttons { flex-direction: column; align-items: center; }
      .btn { width: 80%; justify-content: center; }
      section { padding: 80px 20px; }
      h2 { font-size: 34px; }
    }