/* ============================================================
   3D Nation · Página pública (portada.php)
   Usa los tokens de app.css (se carga antes). Negro / blanco / neutros con el dorado de marca.
   ============================================================ */
.portada { background: var(--surface); font-size: 16px; line-height: 1.6; }
.pt-wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* Encabezado */
.pt-header { background: var(--brand-black); color: var(--text-on-dark); position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--brand-charcoal-2); }
.pt-header-in { display: flex; align-items: center; gap: 20px; min-height: 64px; }
.pt-marca { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .1em; font-size: 15px; }
.pt-marca .brand-logo { width: 34px; height: 34px; color: var(--brand-gold); border-radius: 6px; }
.pt-nav { display: flex; gap: 22px; margin-left: auto; font-size: 14px; }
.pt-nav a { color: var(--text-on-dark-muted); }
.pt-nav a:hover { color: #fff; }
.pt-ingresar { min-height: 36px; }

/* Portada */
.pt-hero { background: var(--brand-black); color: var(--text-on-dark); padding: 72px 0 84px;
  background-image: radial-gradient(circle at 85% 10%, rgba(201,161,59,.14) 0, transparent 45%), radial-gradient(circle at 10% 90%, #18181b 0, transparent 50%); }
.pt-eyebrow { color: var(--brand-gold); font-size: 13px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; margin-bottom: 14px; }
.pt-hero h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.1; letter-spacing: -.02em; max-width: 760px; color: #fff; }
.pt-lead { font-size: clamp(16px, 2vw, 19px); color: var(--text-on-dark-muted); max-width: 640px; margin: 18px 0 30px; }
.pt-acciones { display: flex; flex-wrap: wrap; gap: 12px; }
.pt-btn-claro { color: var(--text-on-dark); border-color: #3f3f46; }
.pt-btn-claro:hover { background: var(--brand-charcoal-2); color: #fff; }

/* Secciones */
.pt-seccion { padding: 64px 0; }
.pt-alt { background: var(--background); border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }
.pt-seccion h2 { font-size: clamp(24px, 3vw, 32px); margin-bottom: 8px; }
.pt-sub { color: var(--text-muted); margin-bottom: 24px; }
.pt-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 24px; }
.pt-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; background: var(--surface); }
.pt-card h3 { font-size: 16px; margin: 14px 0 6px; }
.pt-card p { color: var(--text-secondary); font-size: 14.5px; margin: 0; }
.pt-icono { display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 10px; background: var(--brand-gold-soft); color: var(--brand-gold-text); }
.pt-chips { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.pt-chips li { border: 1px solid var(--border); background: var(--surface); border-radius: 999px; padding: 8px 16px; font-weight: 500; font-size: 15px; }

/* Contacto */
.pt-contacto { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.pt-datos { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.pt-datos li { display: flex; gap: 12px; align-items: flex-start; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.pt-datos li .icon { color: var(--brand-gold-text); margin-top: 3px; }
.pt-datos a { color: var(--text-primary); font-weight: 600; word-break: break-word; }
.pt-datos a:hover { text-decoration: underline; }
.pt-dato-t { display: block; font-size: 12.5px; color: var(--text-muted); }

/* Pie */
.pt-footer { background: var(--brand-black); color: var(--text-on-dark-muted); font-size: 14px; }
.pt-footer-in { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-top: 22px; padding-bottom: 22px; }
.pt-footer a:hover { color: #fff; }

/* Enlace público de un material (material.php) */
.pt-material { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 40px; align-items: start; }
.pt-material-foto { display: block; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--background); cursor: zoom-in; }
.pt-material-foto img { width: 100%; max-height: 78vh; object-fit: contain; display: block; }
.pt-material-sin-foto { cursor: default; padding: 48px; }
.pt-material-sin-foto img { max-height: 160px; opacity: .6; }
.pt-material-nombre { font-size: clamp(26px, 4vw, 38px); line-height: 1.15; letter-spacing: -.01em; margin-bottom: 18px; word-break: break-word; }
.pt-material-dato { font-size: 18px; font-weight: 600; margin-bottom: 18px; }

/* Tableta */
@media (max-width: 900px) {
  .pt-grid { grid-template-columns: repeat(2, 1fr); }
  .pt-contacto { grid-template-columns: 1fr; gap: 28px; }
  .pt-material { grid-template-columns: 1fr; gap: 24px; }
}
/* Celular */
@media (max-width: 600px) {
  .pt-wrap { padding: 0 16px; }
  .pt-nav { display: none; }
  .pt-ingresar { margin-left: auto; }
  .pt-hero { padding: 48px 0 56px; }
  .pt-seccion { padding: 48px 0; }
  .pt-grid { grid-template-columns: 1fr; }
  .pt-acciones .btn { width: 100%; }
}