/* ==========================================================================
   TENIS CEREBRAL — Sistema visual
   Identidad editorial en blanco y negro. Un solo acento discreto.
   El sitio debe seguir funcionando visualmente impreso en blanco y negro.
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  --ink: #161616;
  --ink-soft: #3d3d3d;
  --gray-1: #6b6b6b;
  --gray-2: #9a9a9a;
  --gray-3: #c9c9c9;
  --gray-4: #e6e6e6;
  --paper: #ffffff;
  --paper-warm: #f7f5f2;
  /* Único color de acento, muy discreto. El diseño no depende de él. */
  --accent: #7d6b52;

  --font-serif: "Cormorant Garamond", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --max-width: 72rem;
  --max-text: 44rem;
  --space-section: clamp(4rem, 9vw, 8rem);
  --line: 1px solid var(--gray-3);
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration-color: var(--gray-2); text-underline-offset: 0.18em; }
a:hover { text-decoration-color: var(--ink); }

/* ---------- 3. Tipografía ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.15;
  color: var(--ink);
  margin: 0 0 1rem;
}
h1 { font-size: clamp(2.6rem, 6vw, 4.4rem); letter-spacing: 0.01em; }
h2 { font-size: clamp(1.9rem, 3.6vw, 2.7rem); }
h3 { font-size: clamp(1.35rem, 2.4vw, 1.7rem); }
h4 { font-size: 1.15rem; }

.lead {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.4vw, 1.65rem);
  line-height: 1.5;
  color: var(--ink-soft);
}
.prose { max-width: var(--max-text); }
.prose p { margin: 0 0 1.25rem; }
.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gray-1);
  margin: 0 0 1rem;
}
.muted { color: var(--gray-1); }
.small { font-size: 0.875rem; }

/* ---------- 4. Layout ---------- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.container--narrow { max-width: 52rem; }
.section { padding: var(--space-section) 0; }
.section--tint { background: var(--paper-warm); }
.section + .section { border-top: var(--line); }
.section--tint + .section--tint { border-top: var(--line); }
.section-head { max-width: var(--max-text); margin-bottom: 3rem; }

.grid { display: grid; gap: 2.5rem; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 56rem) {
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
}

/* ---------- 5. Encabezado y navegación ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.96);
  border-bottom: var(--line);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem; min-height: 4.5rem;
}
.brand {
  font-family: var(--font-serif);
  font-size: 1.35rem; font-weight: 600; letter-spacing: 0.14em;
  text-decoration: none; text-transform: uppercase; white-space: nowrap;
}
.nav-toggle {
  display: none;
  background: none; border: var(--line); border-radius: 0;
  font: inherit; font-size: 0.8rem; letter-spacing: 0.14em; text-transform: uppercase;
  padding: 0.5rem 0.9rem; cursor: pointer; color: var(--ink);
}
.site-nav ul {
  display: flex; align-items: center; gap: 1.6rem;
  list-style: none; margin: 0; padding: 0;
}
.site-nav a {
  font-size: 0.86rem; letter-spacing: 0.06em; text-decoration: none;
  color: var(--ink-soft); white-space: nowrap;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--ink); border-bottom: 1px solid var(--ink); padding-bottom: 2px; }

@media (max-width: 62rem) {
  .nav-toggle { display: inline-block; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 100%;
    background: var(--paper); border-bottom: var(--line); }
  .site-nav.is-open { display: block; }
  .site-nav ul { flex-direction: column; align-items: flex-start; gap: 0; padding: 0.5rem 1.5rem 1.25rem; }
  .site-nav li { width: 100%; border-top: var(--line); }
  .site-nav a { display: block; padding: 0.85rem 0; font-size: 0.95rem; }
}

/* ---------- 6. Botones ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.85rem; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  text-decoration: none; text-align: center;
  padding: 0.95rem 1.9rem;
  border: 1px solid var(--ink);
  background: var(--ink); color: var(--paper);
  cursor: pointer;
  transition: background .15s ease, color .15s ease;
}
.btn:hover { background: var(--paper); color: var(--ink); text-decoration: none; }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }
.btn--accent { border-color: var(--accent); background: var(--accent); }
.btn--accent:hover { background: transparent; color: var(--accent); }
.btn--small { padding: 0.6rem 1.1rem; font-size: 0.75rem; }
.btn[disabled], .btn--disabled { opacity: .45; pointer-events: none; }
.btn-row { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2rem; }

/* ---------- 7. Hero ---------- */
.hero { padding: clamp(4rem, 10vw, 9rem) 0; }
.hero__title { text-transform: uppercase; letter-spacing: 0.06em; }
.hero__subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3vw, 2rem);
  color: var(--ink-soft);
  margin: 0 0 2rem;
}
.hero__media { margin-top: 3.5rem; }
.figure { margin: 0; }
.figure img { border: var(--line); filter: grayscale(100%); }
.figure figcaption {
  font-size: 0.8rem; color: var(--gray-1);
  padding-top: 0.6rem; letter-spacing: 0.04em;
}

/* ---------- 8. Bloques editoriales ---------- */
.rule { border: 0; border-top: var(--line); margin: 3rem 0; }
.pull-quote {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  line-height: 1.35;
  max-width: 46rem;
  margin: 0;
  padding-left: 1.75rem;
  border-left: 2px solid var(--ink);
}
.list-plain { list-style: none; margin: 0; padding: 0; }
.list-plain li { padding: 0.9rem 0; border-bottom: var(--line); }
.list-plain li:first-child { border-top: var(--line); }

.tag {
  display: inline-block;
  font-size: 0.7rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  border: 1px solid var(--gray-2); color: var(--gray-1);
  padding: 0.25rem 0.6rem; vertical-align: middle;
}
.tag--ok { border-color: var(--ink); color: var(--ink); }

.card {
  border: var(--line);
  padding: 2rem;
  background: var(--paper);
}
.card h3 { margin-bottom: 0.5rem; }
.card__meta { font-size: 0.8rem; color: var(--gray-1); letter-spacing: 0.06em; text-transform: uppercase; }

.step-number {
  font-family: var(--font-serif);
  font-size: 3rem; line-height: 1; color: var(--gray-3);
  display: block; margin-bottom: 0.75rem;
}

/* ---------- 9. Timeline ---------- */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline::before {
  content: ""; position: absolute; left: 0.45rem; top: 0.5rem; bottom: 0.5rem;
  width: 1px; background: var(--gray-3);
}
.timeline li { position: relative; padding: 0 0 1.75rem 2.25rem; }
.timeline li::before {
  content: ""; position: absolute; left: 0; top: 0.55rem;
  width: 0.9rem; height: 0.9rem; border-radius: 50%;
  background: var(--paper); border: 1px solid var(--ink);
}
.timeline__when { font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--gray-1); display: block; }
.timeline__what { font-family: var(--font-serif); font-size: 1.25rem; }

/* ---------- 10. Formularios ---------- */
.form-grid { display: grid; gap: 1.5rem; max-width: 44rem; }
.field label { display: block; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.45rem; }
.field input[type="text"], .field input[type="email"], .field input[type="date"],
.field input[type="number"], .field select, .field textarea {
  width: 100%; font: inherit; font-size: 1rem;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--gray-2); border-radius: 0;
  background: var(--paper); color: var(--ink);
}
.field textarea { min-height: 6.5rem; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--ink); outline-offset: 1px; border-color: var(--ink);
}
.field .hint { font-size: 0.8rem; color: var(--gray-1); margin-top: 0.35rem; }
.fieldset { border: var(--line); padding: 1.25rem; margin: 0; }
.fieldset legend { font-size: 0.8rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; padding: 0 0.5rem; }
.choice-row { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.choice-row label { display: flex; align-items: center; gap: 0.45rem; font-size: 0.95rem; text-transform: none; letter-spacing: 0; font-weight: 400; }
.consent { display: flex; gap: 0.6rem; align-items: flex-start; font-size: 0.9rem; }
.form-note { font-size: 0.85rem; color: var(--gray-1); }
.form-success { border: 1px solid var(--ink); padding: 1.25rem 1.5rem; background: var(--paper-warm); }

/* ---------- 11. Bitácora ---------- */
.bitacora-progress { margin: 2rem 0 2.5rem; }
.bitacora-progress__bar { height: 3px; background: var(--gray-4); position: relative; }
.bitacora-progress__fill { position: absolute; inset: 0 auto 0 0; background: var(--ink); width: 0; transition: width .25s ease; }
.bitacora-progress__label { font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--gray-1); margin-top: 0.6rem; display: block; }
.bitacora-step { display: none; }
.bitacora-step.is-active { display: block; }
.bitacora-step__quote {
  font-family: var(--font-serif); font-size: 1.5rem; font-style: italic;
  color: var(--ink-soft); border-left: 2px solid var(--accent);
  padding-left: 1.25rem; margin: 0 0 2rem;
}
.bitacora-nav { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.5rem; padding-top: 2rem; border-top: var(--line); }
.bitacora-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.5rem 0; }
.privacy-note {
  border: var(--line); background: var(--paper-warm);
  padding: 1rem 1.25rem; font-size: 0.9rem; color: var(--ink-soft);
}
.preview-box { border: var(--line); padding: 2rem; background: var(--paper); }
.preview-box h4 { margin-top: 1.75rem; }
.preview-box dl { margin: 0; }
.preview-box dt { font-weight: 600; font-size: 0.85rem; letter-spacing: 0.06em; text-transform: uppercase; margin-top: 0.9rem; }
.preview-box dd { margin: 0.15rem 0 0; white-space: pre-wrap; }
.preview-empty { color: var(--gray-2); font-style: italic; }

/* ---------- 12. Pie de página ---------- */
.site-footer { border-top: var(--line); padding: 3.5rem 0 2.5rem; margin-top: var(--space-section); background: var(--paper); }
.site-footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2.5rem; }
@media (max-width: 48rem) { .site-footer__grid { grid-template-columns: 1fr; } }
.site-footer h2 { font-size: 1rem; font-family: var(--font-sans); font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 0.5rem; }
.site-footer a { font-size: 0.9rem; color: var(--ink-soft); text-decoration: none; }
.site-footer a:hover { color: var(--ink); text-decoration: underline; }
.site-footer__legal { margin-top: 3rem; padding-top: 1.5rem; border-top: var(--line); font-size: 0.8rem; color: var(--gray-1); display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: space-between; }

/* ---------- 13. Utilidades ---------- */
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.placeholder-note {
  font-size: 0.75rem; color: var(--gray-1); letter-spacing: 0.04em;
  border-left: 2px solid var(--gray-3); padding-left: 0.75rem; margin-top: 0.75rem;
}
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--ink); color: var(--paper); padding: 0.6rem 1rem; z-index: 100; }
.skip-link:focus { left: 0; }

/* ---------- 14. Impresión ---------- */
@media print {
  .site-header, .site-footer, .btn, .btn-row, .bitacora-actions, .bitacora-nav,
  .nav-toggle, .skip-link, .no-print { display: none !important; }
  body { font-size: 11pt; color: #000; }
  .section { padding: 1.5rem 0; border-top: none; }
  .section + .section { border-top: none; }
  a { text-decoration: none; }
  .card, .preview-box, .privacy-note { border-color: #000; }
  .bitacora-step { display: block !important; page-break-inside: avoid; }
  @page { margin: 2cm; }
}