* { box-sizing: border-box; margin: 0; padding: 0; }
    html, body { font-family: 'Sora', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; }
    html, body { overflow-x: hidden; max-width: 100%; }
    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; height: auto; }
    .accent { color: var(--green); }

    /* ─── NAVBAR ────────────────────────────────────────────── */
    .nav {
      position: sticky; top: 0; z-index: 50;
      background: var(--nav-bg);
      backdrop-filter: saturate(180%) blur(12px);
      -webkit-backdrop-filter: saturate(180%) blur(12px);
      border-bottom: 1px solid var(--border);
    }
    .nav-inner {
      max-width: 1280px; margin: 0 auto;
      padding: 12px 14px;
      display: flex; align-items: center; gap: 10px;
      flex-wrap: wrap;
    }
    @media (min-width: 768px) { .nav-inner { padding: 14px 24px; gap: 32px; flex-wrap: nowrap; } }
    .nav-logo img { height: 26px; }
    @media (min-width: 768px) { .nav-logo img { height: 28px; } }
    /* En mobile chico, hide la pill ACADEMY para ganar espacio */
    @media (max-width: 380px) { .nav-logo .pill { display: none; } }
    .nav-cta { display: flex; gap: 8px; align-items: center; }
    .nav-cta .btn { padding: 9px 14px; font-size: 13px; min-height: 40px; }
    @media (min-width: 768px) { .nav-cta { gap: 10px; } .nav-cta .btn { padding: 10px 18px; font-size: 14px; min-height: 44px; } }
    @media (max-width: 380px) { .nav-cta .btn { padding: 8px 11px; font-size: 12.5px; } }
    /* En pantallas muy chicas, hide "Iniciar sesión" (mismo OAuth que registrarse) */
    @media (max-width: 480px) { .nav-cta .btn-login { display: none; } }
    .nav-logo { display: flex; align-items: center; gap: 10px; }
    .nav-logo img { height: 28px; }
    .nav-logo .pill {
      display: inline-block;
      padding: 3px 11px;
      font-size: 10px; font-weight: 700; letter-spacing: .14em;
      color: var(--green); border: 1.5px solid var(--green); border-radius: 999px;
      text-transform: uppercase; background: transparent;
    }
    .nav-links { display: none; gap: 24px; flex: 1; min-width: 0; flex-wrap: wrap; }
    .nav-links a { color: var(--text-2); font-size: 14px; font-weight: 500; transition: color .15s; white-space: nowrap; }
    .nav-links a:hover { color: var(--green); }
    @media (min-width: 900px) { .nav-links { display: flex; } }
    .nav-cta { display: flex; gap: 10px; }
    .btn {
      display: inline-flex; align-items: center; justify-content: center;
      padding: 10px 18px; border-radius: 8px;
      font-family: inherit; font-size: 14px; font-weight: 600;
      text-decoration: none; transition: all .15s; cursor: pointer;
      border: 1px solid transparent;
      min-height: 44px;
    }
    .btn-ghost { color: var(--text-2); border-color: var(--border); }
    .btn-ghost:hover { color: var(--text); border-color: var(--text-mute); background: var(--bg-3); }
    .btn-primary { background: var(--green); color: var(--text-on-primary); }
    .btn-primary:hover { background: var(--green-2); transform: translateY(-1px); }
    .btn-lg { padding: 14px 28px; font-size: 15px; min-height: 48px; }
    @media (max-width: 480px) {
      .btn-lg { padding: 13px 22px; font-size: 15px; }
    }

    /* ─── HERO ──────────────────────────────────────────────── */
    .hero {
      position: relative;
      padding: 56px 16px 48px;
      overflow: hidden;
    }
    @media (max-width: 480px) { .hero { padding: 40px 16px 36px; } }
    @media (min-width: 768px) { .hero { padding: 96px 24px 80px; } }
    .hero-bg {
      position: absolute; inset: 0;
      background:
        radial-gradient(circle at 20% 20%, var(--hero-glow-1) 0%, transparent 35%),
        radial-gradient(circle at 80% 80%, var(--hero-glow-2) 0%, transparent 40%);
      pointer-events: none;
    }
    .hero-inner {
      max-width: 1280px; margin: 0 auto;
      position: relative;
      display: grid; grid-template-columns: 1fr; gap: 48px; align-items: center;
    }
    @media (min-width: 960px) { .hero-inner { grid-template-columns: 1.1fr 0.9fr; gap: 64px; } }

    .hero-eyebrow {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 6px 14px;
      background: var(--green-soft); border: 1px solid rgba(34,197,94,0.25);
      border-radius: 999px;
      color: var(--green); font-size: 12px; font-weight: 600; letter-spacing: 1.5px;
      margin-bottom: 24px;
    }
    .hero-eyebrow .dot { width: 6px; height: 6px; background: var(--green); border-radius: 50%; }

    .hero h1 {
      font-size: clamp(30px, 5vw, 56px);
      font-weight: 800; line-height: 1.1; letter-spacing: -0.02em;
      margin-bottom: 20px;
      word-wrap: break-word;
    }
    @media (max-width: 480px) {
      .hero h1 { font-size: 30px; line-height: 1.15; margin-bottom: 16px; }
    }
    .hero h1 .accent { color: var(--green); }
    .hero p.lead {
      font-size: 17px; color: var(--text-2);
      max-width: 540px; margin-bottom: 32px; line-height: 1.6;
    }
    @media (max-width: 480px) {
      .hero p.lead { font-size: 15px; margin-bottom: 24px; }
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
    .hero-actions .btn { flex: 1 1 auto; min-width: 140px; }
    @media (min-width: 480px) { .hero-actions .btn { flex: 0 0 auto; } }
    @media (max-width: 480px) {
      .hero-actions { gap: 8px; }
      .hero-actions .btn { width: 100%; min-width: 0; }
    }

    .hero-stats { display: flex; gap: 20px; flex-wrap: wrap; }
    @media (min-width: 480px) { .hero-stats { gap: 32px; } }
    @media (max-width: 380px) { .hero-stats { gap: 14px; } }
    .hero-stat { display: flex; flex-direction: column; }
    .hero-stat .num { font-size: 26px; font-weight: 700; color: var(--text); line-height: 1; }
    .hero-stat .lbl { font-size: 12px; color: var(--text-3); letter-spacing: 1.5px; margin-top: 6px; text-transform: uppercase; }
    @media (max-width: 380px) {
      .hero-stat .num { font-size: 22px; }
      .hero-stat .lbl { font-size: 11px; letter-spacing: 1px; }
    }

    /* Hero visual — explicit dims, no aspect-ratio (cross-browser safer) */
    .hero-visual {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 460px;
      margin: 0 auto;
    }
    .hero-card {
      position: absolute;
      background: var(--elevated); border: 1px solid var(--border); border-radius: 14px;
      padding: 18px; box-shadow: var(--shadow-lg);
      min-width: 180px;
    }
    .hero-card.top    { top: 0; right: 0; width: 72%; }
    .hero-card.mid    { top: 32%; left: 0; width: 78%; z-index: 2; }
    .hero-card.bot    { bottom: 0; right: 8%; width: 68%; }
    .hero-card .emoji { font-size: 28px; line-height: 1; margin-bottom: 10px; }
    .hero-card .ttl   { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 4px; line-height: 1.3; }
    .hero-card .sub   { font-size: 12px; color: var(--text-3); line-height: 1.4; }
    .hero-card.mid .ttl { color: var(--green); }

    /* Mobile sizes */
    @media (max-width: 600px) {
      .hero-visual { height: 340px; max-width: 340px; }
      .hero-card { padding: 14px; min-width: 140px; }
      .hero-card .emoji { font-size: 24px; }
      .hero-card .ttl { font-size: 13px; }
      .hero-card .sub { font-size: 11.5px; }
    }
    @media (max-width: 380px) {
      .hero-visual { height: 300px; max-width: 100%; }
      .hero-card { padding: 12px; min-width: 130px; }
      .hero-card.top, .hero-card.mid, .hero-card.bot { width: 86%; }
      .hero-card .emoji { font-size: 22px; margin-bottom: 6px; }
    }

    /* ─── COURSES ───────────────────────────────────────────── */
    .section {
      padding: 56px 16px;
      border-top: 1px solid var(--border);
    }
    @media (max-width: 480px) { .section { padding: 44px 16px; } }
    @media (min-width: 768px) { .section { padding: 80px 24px; } }
    .section-inner { max-width: 1280px; margin: 0 auto; }
    .section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 28px; flex-wrap: wrap; }
    @media (min-width: 768px) { .section-head { gap: 24px; margin-bottom: 40px; } }
    @media (max-width: 480px) { .section-head { margin-bottom: 22px; gap: 10px; } }
    .section-head h2 { font-size: clamp(24px, 3.5vw, 36px); font-weight: 700; letter-spacing: -0.01em; line-height: 1.2; }
    .section-head p { color: var(--text-3); font-size: 14px; max-width: 360px; }
    @media (max-width: 480px) { .section-head p { font-size: 13.5px; } }

    .courses-grid {
      display: grid; gap: 16px;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }
    @media (min-width: 768px) { .courses-grid { gap: 20px; } }
    @media (max-width: 480px) {
      .courses-grid { grid-template-columns: 1fr; gap: 14px; }
    }
    .course-card {
      background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
      overflow: hidden;
      transition: transform .2s, border-color .2s, box-shadow .2s;
      cursor: pointer;
      display: flex; flex-direction: column;
    }
    .course-card:hover { transform: translateY(-4px); border-color: rgba(34,197,94,0.4); box-shadow: var(--shadow-lg); }
    .course-cover {
      aspect-ratio: 16 / 9;
      background: var(--surface);
      background-size: cover; background-position: center;
      position: relative;
    }
    .course-cover-placeholder { display: flex; align-items: center; justify-content: center; height: 100%; font-size: 48px; opacity: 0.4; }
    .course-info { padding: 18px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
    @media (max-width: 480px) { .course-info { padding: 16px; gap: 9px; } }
    .course-tag {
      display: inline-block; padding: 3px 9px;
      background: var(--green-soft); color: var(--green);
      border-radius: 4px; font-size: 10px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase;
      width: fit-content;
    }
    .course-title { font-size: 16px; font-weight: 600; color: var(--text); line-height: 1.3; }
    .course-meta { font-size: 12px; color: var(--text-3); display: flex; gap: 12px; flex-wrap: wrap; }
    .course-price { margin-top: auto; padding-top: 12px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
    .course-price .price { font-size: 18px; font-weight: 700; color: var(--green); }
    .course-price .free  { color: var(--green); font-weight: 700; font-size: 14px; }
    .course-price .arrow { color: var(--text-3); }

    .courses-empty {
      text-align: center; padding: 60px 20px;
      background: var(--surface); border: 1px dashed var(--border); border-radius: 14px;
      color: var(--text-3);
    }

    /* ─── VALUE PROPS ───────────────────────────────────────── */
    .props-grid {
      display: grid; gap: 24px;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }
    @media (max-width: 480px) {
      .props-grid { grid-template-columns: 1fr; gap: 14px; }
    }
    .prop {
      padding: 28px 24px;
      background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
    }
    @media (max-width: 480px) {
      .prop { padding: 22px 18px; }
    }
    .prop .icon { width: 44px; height: 44px; border-radius: 10px; background: var(--green-soft); display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 16px; }
    .prop h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
    .prop p  { font-size: 13.5px; color: var(--text-3); line-height: 1.6; }
    @media (max-width: 480px) {
      .prop p { font-size: 14px; }
    }

    /* ─── CTA STRIP ─────────────────────────────────────────── */
    .cta-strip {
      padding: 56px 16px;
      border-top: 1px solid var(--border);
      background: linear-gradient(180deg, var(--green-soft), var(--green-mute));
    }
    @media (max-width: 480px) { .cta-strip { padding: 44px 16px; } }
    @media (min-width: 768px) { .cta-strip { padding: 80px 24px; } }
    .cta-inner { max-width: 720px; margin: 0 auto; text-align: center; }
    .cta-inner h2 { font-size: clamp(24px, 4vw, 40px); font-weight: 700; margin-bottom: 14px; letter-spacing: -0.01em; line-height: 1.2; }
    .cta-inner p { color: var(--text-2); font-size: 16px; margin-bottom: 28px; }
    @media (max-width: 480px) {
      .cta-inner p { font-size: 14.5px; margin-bottom: 22px; }
    }

    /* ─── FOOTER ────────────────────────────────────────────── */
    .footer {
      padding: 40px 24px 32px;
      border-top: 1px solid var(--border);
      color: var(--text-3);
    }
    @media (max-width: 480px) {
      .footer { padding: 32px 16px 24px; }
    }
    .footer-inner { max-width: 1280px; margin: 0 auto; display: flex; flex-direction: column; gap: 24px; align-items: center; text-align: center; }
    .footer .logo-line { display: flex; align-items: center; gap: 10px; }
    .footer .logo-line img { height: 22px; }
    .footer .links { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; font-size: 13px; }
    .footer .links a { color: var(--text-3); }
    .footer .links a:hover { color: var(--green); }
    .footer .copy { font-size: 12px; color: var(--text-mute); }
    @media (min-width: 768px) {
      .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; }
    }