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

    :root {
      --bg: #0a0f1e;
      --bg2: #0f1628;
      --card: #131c35;
      --card-border: #1e2d50;
      --accent: #00d4ff;
      --accent2: #7c5cfc;
      --accent3: #ff6b6b;
      --text: #e8eaf6;
      --muted: #7a85a3;
      --white: #ffffff;
      --radius: 16px;
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: 'DM Sans', sans-serif;
      background: var(--bg);
      color: var(--text);
      min-height: 100vh;
      overflow-x: hidden;
    }

    /* ─── NAV ─── */
    nav {
      position: sticky; top: 0; z-index: 100;
      display: flex; align-items: center; justify-content: space-between;
      padding: 18px 5%;
      background: rgba(10, 15, 30, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--card-border);
    }

    .logo {
      display: flex; align-items: center;
      text-decoration: none;
    }
    .logo-img {
      height: 28px; width: auto; display: block;
    }

    .nav-links { display: flex; gap: 10px; align-items: center; }

    .nav-links a {
      font-size: 0.9rem; font-weight: 500; color: var(--muted);
      text-decoration: none; padding: 8px 16px; border-radius: 8px;
      transition: color 0.2s, background 0.2s;
    }
    .nav-links a:hover { color: var(--white); background: var(--card); }

    .btn-nav {
      background: linear-gradient(135deg, var(--accent2), var(--accent));
      color: var(--white) !important;
      border-radius: 10px !important;
      font-weight: 600 !important;
      padding: 9px 20px !important;
    }
    .btn-nav:hover { opacity: 0.9; background: linear-gradient(135deg, var(--accent2), var(--accent)) !important; }

    /* ─── HERO ─── */
    .hero {
      position: relative;
      padding: 100px 5% 80px;
      text-align: center;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute; inset: 0;
      background:
        radial-gradient(ellipse 60% 50% at 50% 0%, rgba(0,212,255,0.12) 0%, transparent 70%),
        radial-gradient(ellipse 40% 40% at 20% 80%, rgba(124,92,252,0.1) 0%, transparent 60%);
      pointer-events: none;
    }

    /* floating blobs */
    .blob {
      position: absolute; border-radius: 50%; filter: blur(60px); pointer-events: none; opacity: 0.18;
      animation: float 8s ease-in-out infinite;
    }
    .blob1 { width: 320px; height: 320px; background: var(--accent); top: -80px; left: -60px; animation-delay: 0s; }
    .blob2 { width: 260px; height: 260px; background: var(--accent2); bottom: 0; right: -40px; animation-delay: 3s; }
    .blob3 { width: 180px; height: 180px; background: var(--accent3); top: 40%; left: 15%; animation-delay: 5s; }

    @keyframes float {
      0%, 100% { transform: translateY(0) scale(1); }
      50% { transform: translateY(-30px) scale(1.05); }
    }

    .badge {
      display: inline-block;
      background: rgba(0,212,255,0.12);
      border: 1px solid rgba(0,212,255,0.3);
      color: var(--accent);
      font-size: 0.78rem; font-weight: 600; letter-spacing: 1.5px;
      text-transform: uppercase;
      padding: 6px 18px; border-radius: 50px;
      margin-bottom: 24px;
      animation: fadeUp 0.6s ease both;
    }

    .hero h1 {
      font-family: 'Syne', sans-serif;
      font-size: clamp(2.4rem, 6vw, 4.2rem);
      font-weight: 800;
      line-height: 1.12;
      letter-spacing: -1.5px;
      color: var(--white);
      max-width: 820px; margin: 0 auto 20px;
      animation: fadeUp 0.7s ease 0.1s both;
    }

    .hero h1 span {
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    }

    .hero p {
      font-size: 1.1rem; color: var(--muted); max-width: 560px;
      margin: 0 auto 36px; line-height: 1.7;
      animation: fadeUp 0.7s ease 0.2s both;
    }

    .hero-actions {
      display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
      animation: fadeUp 0.7s ease 0.3s both;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent2), var(--accent));
      color: var(--white);
      padding: 14px 32px; border-radius: 12px;
      font-family: 'DM Sans', sans-serif; font-size: 1rem; font-weight: 600;
      text-decoration: none; border: none; cursor: pointer;
      box-shadow: 0 0 30px rgba(0,212,255,0.2);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 40px rgba(0,212,255,0.35); }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--card-border);
      color: var(--text);
      padding: 14px 32px; border-radius: 12px;
      font-family: 'DM Sans', sans-serif; font-size: 1rem; font-weight: 500;
      text-decoration: none; cursor: pointer;
      transition: border-color 0.2s, background 0.2s;
    }
    .btn-secondary:hover { border-color: var(--accent); background: rgba(0,212,255,0.05); }

    /* avatars row */
    .avatars-row {
      display: flex; align-items: center; justify-content: center; gap: 12px;
      margin-top: 48px;
      animation: fadeUp 0.7s ease 0.4s both;
    }
    .avatars { display: flex; }
    .avatars span {
      width: 36px; height: 36px; border-radius: 50%;
      border: 2px solid var(--bg);
      margin-left: -10px; display: block;
      background: linear-gradient(135deg, var(--accent2), var(--accent));
      overflow: hidden; font-size: 0.7rem; color: white;
      display: flex; align-items: center; justify-content: center; font-weight: 700;
    }
    .avatars span:nth-child(2) { background: linear-gradient(135deg, #ff6b6b, var(--accent2)); }
    .avatars span:nth-child(3) { background: linear-gradient(135deg, var(--accent), #00ff88); }
    .avatars span:nth-child(4) { background: linear-gradient(135deg, #ffcc00, #ff6b6b); }
    .avatars span:nth-child(5) { background: linear-gradient(135deg, var(--accent2), #ff6b6b); }
    .avatars-text { font-size: 0.88rem; color: var(--muted); }
    .avatars-text strong { color: var(--white); }

    /* ─── STATS ─── */
    .stats {
      display: flex; justify-content: center; gap: 0;
      margin: 0 5% 80px;
      background: var(--card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      overflow: hidden;
      animation: fadeUp 0.7s ease 0.5s both;
    }
    .stat {
      flex: 1; padding: 28px 24px; text-align: center;
      border-right: 1px solid var(--card-border);
      position: relative;
    }
    .stat:last-child { border-right: none; }
    .stat-num {
      font-family: 'Syne', sans-serif;
      font-size: 2rem; font-weight: 800; color: var(--white);
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    }
    .stat-label { font-size: 0.85rem; color: var(--muted); margin-top: 4px; }

    /* ─── SECTION TITLE ─── */
    .section-title {
      text-align: center; margin-bottom: 48px;
    }
    .section-title h2 {
      font-family: 'Syne', sans-serif;
      font-size: clamp(1.6rem, 3.5vw, 2.4rem);
      font-weight: 800; color: var(--white); letter-spacing: -0.5px;
      margin-bottom: 10px;
    }
    .section-title p { color: var(--muted); font-size: 1rem; max-width: 480px; margin: 0 auto; }

    /* ─── CATEGORIES ─── */
    .categories-section { padding: 0 5% 80px; }

    .categories-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
      gap: 14px;
    }

    .cat-card {
      background: var(--card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 24px 18px;
      text-align: center;
      cursor: pointer;
      transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
      text-decoration: none;
    }
    .cat-card:hover {
      transform: translateY(-4px);
      border-color: var(--accent);
      box-shadow: 0 8px 30px rgba(0,212,255,0.1);
    }
    .cat-icon { font-size: 2rem; margin-bottom: 10px; display: block; }
    .cat-icon i { font-size: 2.5rem; color: #fff; }
    .cat-name { font-weight: 600; color: var(--white); font-size: 0.95rem; }
    .cat-count { font-size: 0.78rem; color: var(--muted); margin-top: 4px; }

    /* ─── CONTENT CARDS ─── */
    .content-section { padding: 0 5% 80px; }

    .content-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 22px;
    }

    .content-card {
      background: var(--card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      overflow: hidden;
      transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
      text-decoration: none;
      display: block;
    }
    .content-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 16px 40px rgba(0,0,0,0.35);
      border-color: rgba(0,212,255,0.3);
    }

    .card-thumb {
      width: 100%; aspect-ratio: 16/9;
      position: relative; overflow: hidden;
      display: flex; align-items: center; justify-content: center;
    }
    .card-thumb-img {
      width: 100%; height: 100%; object-fit: cover; display: block;
    }

    .card-type-badge {
      position: absolute; top: 12px; left: 12px; z-index: 2;
      font-size: 0.7rem; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
      padding: 4px 12px; border-radius: 50px;
    }
    .type-tutorial { background: rgba(0,212,255,0.2); color: var(--accent); border: 1px solid rgba(0,212,255,0.3); }
    .type-articulo  { background: rgba(255,107,107,0.2); color: var(--accent3); border: 1px solid rgba(255,107,107,0.3); }
    .type-video     { background: rgba(124,92,252,0.2); color: #b39dff; border: 1px solid rgba(124,92,252,0.3); }
    .type-recurso   { background: rgba(0,255,136,0.15); color: #00ff88; border: 1px solid rgba(0,255,136,0.3); }

    .card-time {
      position: absolute; bottom: 10px; right: 12px; z-index: 2;
      font-size: 0.75rem; color: rgba(255,255,255,0.7);
      background: rgba(0,0,0,0.5); padding: 3px 9px; border-radius: 6px;
    }

    .card-body { padding: 18px 18px 20px; }

    .card-category {
      font-size: 0.75rem; font-weight: 600; color: var(--accent);
      text-transform: uppercase; letter-spacing: 0.8px; margin-bottom: 8px;
    }

    .card-title {
      font-family: 'Syne', sans-serif;
      font-size: 1.05rem; font-weight: 700; color: var(--white);
      line-height: 1.35; margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.88rem; color: var(--muted); line-height: 1.6; margin-bottom: 16px;
    }

    .card-link {
      display: inline-flex; align-items: center; gap: 6px;
      font-size: 0.88rem; font-weight: 600;
      color: var(--accent); text-decoration: none;
      transition: gap 0.2s;
    }
    .card-link:hover { gap: 10px; }

    /* ─── CTA SECTION ─── */
    .cta-section {
      margin: 0 5% 80px;
      background: linear-gradient(135deg, rgba(124,92,252,0.15), rgba(0,212,255,0.1));
      border: 1px solid var(--card-border);
      border-radius: 24px;
      padding: 64px 5%;
      text-align: center;
      position: relative; overflow: hidden;
    }
    .cta-section::before {
      content: '';
      position: absolute; top: -50%; left: -20%;
      width: 60%; height: 200%;
      background: radial-gradient(ellipse, rgba(0,212,255,0.08), transparent 70%);
      pointer-events: none;
    }

    .cta-section h2 {
      font-family: 'Syne', sans-serif;
      font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800;
      color: var(--white); letter-spacing: -0.5px;
      margin-bottom: 14px;
    }
    .cta-section p { color: var(--muted); font-size: 1.05rem; margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }

    /* ─── FOOTER ─── */
    footer {
      border-top: 1px solid var(--card-border);
      padding: 36px 5%;
      display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
    }
    .footer-links { display: flex; gap: 24px; }
    .footer-links a { font-size: 0.85rem; color: var(--muted); text-decoration: none; transition: color 0.2s; }
    .footer-links a:hover { color: var(--white); }
    .footer-copy { font-size: 0.82rem; color: var(--muted); }

    /* ─── ANIMATIONS ─── */
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(24px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    .reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }

    /* ─── RESPONSIVE ─── */

    /* Laptop (1024px – 1280px) */
    @media (max-width: 1280px) {
      .hero { padding: 80px 6% 70px; }
      .content-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
      .categories-grid { grid-template-columns: repeat(4, 1fr); }
    }

    /* Tablet (600px – 1023px) */
    @media (max-width: 1023px) {
      nav { padding: 16px 4%; }
      .hero { padding: 70px 4% 60px; }
      .hero h1 { font-size: clamp(2rem, 5vw, 3rem); }
      .categories-section, .content-section { padding: 0 4% 60px; }
      .categories-grid { grid-template-columns: repeat(4, 1fr); gap: 12px; }
      .content-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
      .section-title h2 { font-size: 1.8rem; }
      footer { padding: 28px 4%; }
    }

    /* Mobile (< 600px) */
    @media (max-width: 599px) {
      nav { padding: 14px 4%; }
      .logo { font-size: 1.3rem; }
      .nav-links a:not(.btn-nav) { display: none; }

      .hero { padding: 56px 4% 48px; }
      .hero h1 { font-size: clamp(1.8rem, 8vw, 2.4rem); letter-spacing: -1px; }
      .hero p { font-size: 0.95rem; }
      .hero-actions { flex-direction: column; align-items: center; }
      .btn-primary, .btn-secondary { width: 100%; max-width: 320px; text-align: center; }
      .blob { display: none; }

      .categories-section, .content-section { padding: 0 4% 48px; }
      .categories-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
      .cat-card { padding: 18px 12px; }
      .cat-icon { font-size: 1.6rem; }
      .cat-name { font-size: 0.85rem; }
      .cat-count { font-size: 0.72rem; }

      .content-grid { grid-template-columns: 1fr; gap: 16px; }
      .section-title h2 { font-size: 1.5rem; }
      .section-title p { font-size: 0.9rem; }

      footer {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 14px;
        padding: 28px 4%;
      }
      .footer-links { flex-wrap: wrap; justify-content: center; gap: 16px; }
      .footer-copy { font-size: 0.78rem; }
      }