/* ============================================================================
   main.css — variables, reset, tipografía y layout base
   Estética: editorial-académica / manuscrito ilustrado contemporáneo
   ========================================================================== */

:root {
  /* ── Paleta (definida en CLAUDE.md) ── */
  --color-bg: #F7F5F0;
  --color-urbina: #1B4F8A;        /* azul — postura católica */
  --color-urbina-light: #E8EFF8;
  --color-pacheco: #7A2E2E;       /* granate — postura evangélica */
  --color-pacheco-light: #F5EAEA;
  --color-accent: #C4922A;        /* dorado — acentos, highlights */
  --color-text: #1A1814;
  --color-text-muted: #6B6560;

  /* ── Derivados ── */
  --color-bg-deep: #EFEBE2;       /* crema más profundo para bandas */
  --color-line: #DAD3C6;          /* reglas tipográficas */
  --color-ink-soft: rgba(26, 24, 20, 0.06);
  --color-urbina-deep: #163F6E;
  --color-pacheco-deep: #5F2222;
  --color-accent-deep: #A4781D;

  /* ── Tipografía ── */
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Spectral', Georgia, serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;

  /* ── Escala tipográfica fluida ── */
  --step--1: clamp(0.83rem, 0.78rem + 0.22vw, 0.94rem);
  --step-0:  clamp(1rem, 0.93rem + 0.34vw, 1.19rem);
  --step-1:  clamp(1.2rem, 1.08rem + 0.6vw, 1.55rem);
  --step-2:  clamp(1.44rem, 1.25rem + 0.95vw, 2.1rem);
  --step-3:  clamp(1.73rem, 1.43rem + 1.5vw, 2.9rem);
  --step-4:  clamp(2.07rem, 1.6rem + 2.35vw, 4rem);
  --step-5:  clamp(2.49rem, 1.74rem + 3.75vw, 5.6rem);

  /* ── Espaciado ── */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --space-2xl: 8rem;

  --container: 72rem;
  --container-narrow: 50rem;
  --radius: 4px;
  --radius-lg: 10px;

  --shadow-soft: 0 1px 2px rgba(26, 24, 20, 0.04), 0 8px 24px -12px rgba(26, 24, 20, 0.18);
  --shadow-lift: 0 2px 4px rgba(26, 24, 20, 0.06), 0 20px 48px -20px rgba(26, 24, 20, 0.28);

  --nav-h: 4.25rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  font-feature-settings: 'liga' 1, 'kern' 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  /* Textura sutil de papel mediante gradientes radiales tenues */
  background-image:
    radial-gradient(circle at 15% 12%, rgba(196, 146, 42, 0.04), transparent 40%),
    radial-gradient(circle at 85% 88%, rgba(27, 79, 138, 0.035), transparent 45%);
  background-attachment: fixed;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
ul { list-style: none; }

::selection {
  background: var(--color-accent);
  color: #fff;
}

/* ── Tipografía base ── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.01em;
  font-optical-sizing: auto;
}

em { font-style: italic; }
strong { font-weight: 600; }

p + p { margin-top: var(--space-sm); }

/* ── Etiqueta / kicker (monoespaciada, versalitas) ── */
.kicker {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 500;
}
.kicker--center { text-align: center; }
.kicker--urbina { color: var(--color-urbina); }
.kicker--pacheco { color: var(--color-pacheco); }

/* ── Layout helpers ── */
section {
  position: relative;
  padding-block: var(--space-2xl);
  padding-inline: clamp(1.25rem, 5vw, 4rem);
}

.section-head {
  max-width: var(--container-narrow);
  margin: 0 auto var(--space-xl);
  position: relative;
}
.section-head__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--color-accent);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}
.section-head .kicker { margin-bottom: 0.6rem; }
.section-head__title {
  font-size: var(--step-4);
  font-weight: 600;
}
.section-head__lead {
  margin-top: var(--space-md);
  font-size: var(--step-1);
  color: var(--color-text-muted);
  max-width: 40ch;
  line-height: 1.5;
}

/* ── Skip link ── */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 1000;
  background: var(--color-text);
  color: var(--color-bg);
  padding: 0.75rem 1.25rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

/* ── Barra de progreso ── */
.progress-bar {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-urbina), var(--color-accent), var(--color-pacheco));
  transform: scaleX(0);
  transform-origin: left;
  z-index: 999;
  transition: transform 0.1s linear;
}

/* ── Navegación ── */
.site-nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: clamp(1.25rem, 5vw, 4rem);
  background: rgba(247, 245, 240, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.site-nav--scrolled {
  border-bottom-color: var(--color-line);
}
.site-nav__brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--color-text);
}
.site-nav__mark { color: var(--color-accent); font-size: 1.1rem; }
.site-nav__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--step-0);
  letter-spacing: -0.01em;
}
.site-nav__links {
  display: flex;
  gap: clamp(1rem, 2.5vw, 2rem);
}
.site-nav__links a {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  padding-block: 0.25rem;
  position: relative;
  transition: color 0.2s ease;
}
.site-nav__links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.site-nav__links a:hover { color: var(--color-text); }
.site-nav__links a:hover::after { transform: scaleX(1); }

.site-nav__toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text);
  cursor: pointer;
}

/* ── Footer ── */
.site-footer {
  text-align: center;
  padding: var(--space-xl) clamp(1.25rem, 5vw, 4rem) var(--space-lg);
  border-top: 1px solid var(--color-line);
  background: var(--color-bg-deep);
}
.site-footer__mark { color: var(--color-accent); font-size: 1.5rem; margin-bottom: var(--space-sm); }
.site-footer__text {
  max-width: 48ch;
  margin: 0 auto;
  color: var(--color-text-muted);
  font-size: var(--step--1);
  line-height: 1.6;
}

/* ── Animación de reveal genérica (IntersectionObserver) ── */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ── Responsive nav ── */
@media (max-width: 768px) {
  .site-nav__toggle { display: block; }
  .site-nav__links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-line);
    padding: var(--space-sm) clamp(1.25rem, 5vw, 4rem) var(--space-md);
    transform: translateY(-120%);
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: var(--shadow-soft);
  }
  .site-nav__links.is-open { transform: translateY(0); }
  .site-nav__links a {
    padding-block: 0.85rem;
    font-size: var(--step-0);
    border-bottom: 1px solid var(--color-line);
  }
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}