/* ═══════════════════════════════════════════════════════════════════════
   RESPONSIVE — Breakpoints
   900px : tablet landscape
   768px : tablet portrait / large phone
   480px : small phones
═══════════════════════════════════════════════════════════════════════ */

/* ── 900px — tablet adjustments ───────────────────────────────────────── */
@media (max-width: 900px) {
  nav {
    padding: 0 24px;
  }

  section {
    padding: 80px 24px;
  }

  .bivia-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .portal-reveal {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .servicios-grid {
    grid-template-columns: 1fr;
  }

  #proyectos {
    padding: 80px 0;
  }

  .proyectos-container {
    padding: 0 24px;
  }

  .proyectos-grid {
    padding: 0 24px;
    gap: 16px;
  }

  .proyecto-card,
  .proyecto-card.featured {
    width: 320px;
    height: 420px;
    padding: 32px 24px;
  }

  .proyecto-title,
  .proyecto-card.featured .proyecto-title {
    font-size: 24px;
  }

  .form-grid-2 {
    grid-template-columns: 1fr;
  }

  footer {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

/* ── 768px — mobile / phone ────────────────────────────────────────────── */
@media (max-width: 768px) {

  /* NAV */
  nav {
    padding: 0 20px;
  }

  .nav-links { display: none; }
  .nav-cta   { display: none; }
  .nav-hamburger { display: flex; }

  /* GLOBAL */
  section {
    padding: 64px 20px;
  }

  /* ── HERO ────────────────────────────────────────────────────────────── */
  #hero-wrapper {
    height: 220vh;
  }

  /* ── BIVIA / QueBivia ────────────────────────────────────────────────── */
  #bivia {
    padding: 56px 20px 72px;
  }

  .portal-reveal {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 52px 0 44px;
    margin-bottom: 52px;
  }

  .portal-letters {
    gap: 0.05em;
    margin-bottom: 28px;
    justify-content: flex-start;
  }

  .portal-line-inner {
    font-size: clamp(22px, 6.5vw, 34px);
  }

  .portal-reveal-right {
    justify-content: center;
  }

  .portal-display-card {
    width: 220px;
    height: 128px;
  }

  .portal-display-card:nth-child(2) {
    transform: skewY(-8deg) translateX(48px) translateY(32px);
  }
  .portal-display-card:nth-child(2):hover {
    transform: skewY(-8deg) translateX(48px) translateY(26px);
  }

  .portal-display-card:nth-child(3) {
    transform: skewY(-8deg) translateX(96px) translateY(64px);
  }
  .portal-display-card:nth-child(3):hover {
    transform: skewY(-8deg) translateX(96px) translateY(96px);
  }

  .bivia-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .bivia-headline {
    font-size: clamp(26px, 7vw, 38px);
    line-height: 1.2;
  }

  .bivia-desc {
    font-size: 14px;
    max-width: 100%;
    margin-bottom: 32px;
  }

  .bivia-pillar {
    grid-template-columns: 36px 1fr;
    gap: 14px;
    padding: 22px 0;
  }

  .bivia-pillar-content h3 {
    font-size: 16px;
  }

  /* ── BIVIA LINES ─────────────────────────────────────────────────────── */
  .bivia-lines-wrapper {
    height: 180vh;
  }

  .bivia-lines-inner {
    padding: 0 20px;
  }

  /* ── BENTO ─────────────────────────────────────────────────── */
  .bivia-bento {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .bivia-bento > *:nth-child(1),
  .bivia-bento > *:nth-child(4) {
    grid-column: span 1;
  }

  /* ── FORM ────────────────────────────────────────────────────────────── */
  #contacto {
    padding: 64px 20px;
  }

  .form-wrapper {
    max-width: 100%;
  }

  .form-header {
    margin-bottom: 40px;
  }

  .form-headline {
    font-size: clamp(26px, 7vw, 38px);
  }

  .form-progress {
    margin-bottom: 36px;
  }

  .form-step-title {
    font-size: 20px;
  }

  .options-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .options-grid-2 {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .options-grid-obj {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .timeline-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .form-grid-2 {
    grid-template-columns: 1fr;
  }

  .budget-display {
    font-size: 28px;
  }

  .form-nav {
    flex-direction: column-reverse;
    align-items: stretch;
    gap: 12px;
    margin-top: 36px;
  }

  .form-nav-right {
    justify-content: space-between;
    width: 100%;
    gap: 12px;
  }

  .btn-next,
  .btn-back {
    flex: 1;
    text-align: center;
    padding-left: 0;
    padding-right: 0;
  }

  .success-state {
    padding: 52px 0;
  }

  /* ── FOOTER ──────────────────────────────────────────────────────────── */
  footer {
    flex-direction: column;
    gap: 12px;
    text-align: center;
    padding: 36px 20px;
  }
}

/* ── 480px — small phones ─────────────────────────────────────────────── */
@media (max-width: 480px) {

  section {
    padding: 56px 16px;
  }

  .portal-letter {
    font-size: clamp(30px, 11vw, 46px);
  }

  .portal-line-inner {
    font-size: clamp(20px, 6vw, 28px);
  }

  .bivia-headline {
    font-size: clamp(24px, 6.5vw, 32px);
  }

  .options-grid,
  .options-grid-2 {
    grid-template-columns: 1fr;
  }

  .option-card {
    padding: 16px 14px;
  }

  .nav-mobile-link {
    font-size: 22px;
    padding: 15px 0;
  }
}