/* =========================================================
   Alethra Design System — Tokens
   Capa 1: variables, reset, layout, tipografia, utilidades
   ========================================================= */

:root {
  /* ── Raw palette ── */
  --color-ivory-100:    #F6F4EF;
  --color-ivory-50:     #FBFAF7;
  --color-amber-500:    #C27A2C;
  --color-amber-700:    #9A5E21;
  --color-amber-100:    #FAF3EA;
  --color-ink-900:      #2B2B2B;
  --color-ink-600:      #6B6B6B;
  --color-ink-400:      #787878;
  --color-sand-300:     #E5E2DA;
  --color-dark-900:     #1C1917;
  --color-dark-400:     #A8A29E;

  /* ── Brand aliases (semiótica ἀ-λήθεια) ── */
  --brand-profundidad:  var(--color-dark-900);   /* lo más oculto        */
  --brand-lethe:        var(--color-ink-600);     /* el río del olvido    */
  --brand-aletheia:     var(--color-amber-500);   /* la verdad desocultada */
  --brand-claridad:     var(--color-ivory-100);   /* lo plenamente visible */
  --brand-pergamino:    var(--color-sand-300);     /* el soporte, la traza  */

  /* ── Semantic: consumed by components ── */
  --color-bg:           var(--color-ivory-100);
  --color-bg-soft:      var(--color-ivory-50);
  --color-bg-warm:      var(--color-amber-100);
  --color-bg-dark:      var(--color-dark-900);
  --color-text:         var(--color-ink-900);
  --color-text-soft:    var(--color-ink-600);
  --color-text-muted:   var(--color-ink-400);
  --color-heading:      var(--color-ink-900);
  --color-accent:       var(--color-amber-500);
  --color-accent-hover: var(--color-amber-700);
  --color-accent-soft:  var(--color-amber-100);
  --color-border:       var(--color-sand-300);
  --color-dark-text:    var(--color-dark-400);
  --color-on-accent:    var(--color-ivory-50);
  --color-on-dark:      var(--color-ivory-100);

  /* ── Typography ── */
  --font-sans:  "Inter", system-ui, -apple-system, sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
  --font-mono:  ui-monospace, "SF Mono", "Cascadia Code", monospace;

  --text-xs:    0.75rem;
  --text-sm:    0.875rem;
  --text-base:  1rem;
  --text-lg:    1.125rem;
  --text-xl:    1.25rem;
  --text-2xl:   1.5rem;
  --text-2xs:   0.625rem;
  --text-3xl:   1.875rem;
  --text-4xl:   2.25rem;
  --text-5xl:   3rem;
  --text-6xl:   3.75rem;
  --text-7xl:   4.5rem;

  --line-tight:   1.08;
  --line-snug:    1.25;
  --line-normal:  1.6;
  --line-relaxed: 1.65;

  --tracking-tight:  -0.02em;
  --tracking-wide:    0.08em;
  --tracking-widest:  0.25em;

  /* ── Spacing ── */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.5rem;
  --space-6:  2rem;
  --space-7:  2.5rem;
  --space-8:  3rem;
  --space-9:  4rem;
  --space-10: 5rem;
  --space-11: 7rem;
  --space-12: 9rem;

  /* ── Borders & Radius ── */
  --radius-sm:  4px;
  --radius-md:  6px;
  --radius-lg:  12px;
  --radius-xl:  16px;

  /* ── Shadows ── */
  --shadow-sm: 0 1px 3px rgba(43, 43, 43, 0.06);
  --shadow-md: 0 8px 24px rgba(43, 43, 43, 0.08);

  /* ── Layout ── */
  --container-lg: 72rem;
  --container-md: 64rem;
  --container-sm: 42rem;

  /* ── Alpha variants (semantic) ── */
  --color-header-bg:      rgba(251, 250, 247, 0.95);
  --color-accent-alpha-20: rgba(194, 122, 44, 0.20);
  --color-accent-alpha-25: rgba(194, 122, 44, 0.25);
  --color-accent-alpha-35: rgba(194, 122, 44, 0.35);
  --color-accent-alpha-40: rgba(194, 122, 44, 0.40);
  --color-accent-alpha-60: rgba(194, 122, 44, 0.60);
  --color-accent-alpha-70: rgba(194, 122, 44, 0.70);
  --color-border-light:    rgba(43, 43, 43, 0.10);
  --color-border-soft:     rgba(229, 226, 218, 0.60);
  --color-ink-alpha-08:    rgba(43, 43, 43, 0.08);
  --color-ink-alpha-06:    rgba(43, 43, 43, 0.06);
  --color-ink-alpha-20:    rgba(43, 43, 43, 0.20);
  --color-ink-alpha-25:    rgba(43, 43, 43, 0.25);
  --color-ink-alpha-40:    rgba(43, 43, 43, 0.40);
  --color-accent-alpha-10: rgba(194, 122, 44, 0.10);
  --color-overlay:         rgba(28, 25, 23, 0.45);

  /* ── Feedback ── */
  --color-error:          #8b1a1a;

  /* ── Accessibility ── */
  --focus-ring:   2px solid var(--color-accent);
  --focus-offset: 2px;
}

/* =========================================================
   Reset
   ========================================================= */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--line-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea,
select {
  font: inherit;
}

:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-sm);
}

/* =========================================================
   Layout
   ========================================================= */

.container {
  width: min(100% - 3rem, var(--container-lg));
  margin-inline: auto;
}

.container--md {
  width: min(100% - 3rem, var(--container-md));
  margin-inline: auto;
}

.container--sm {
  width: min(100% - 3rem, var(--container-sm));
  margin-inline: auto;
}

.section {
  padding: var(--space-10) 0;
}

.section--lg {
  padding: var(--space-11) 0;
}

.section--xl {
  padding: var(--space-12) 0;
}

/* =========================================================
   Typography
   ========================================================= */

h1, h2, h3, h4 {
  margin: 0 0 var(--space-4);
  color: var(--color-heading);
  font-weight: 700;
  line-height: var(--line-tight);
  letter-spacing: var(--tracking-tight);
}

h1 {
  font-size: clamp(2.75rem, 5vw, var(--text-6xl));
  font-weight: 800;
}

h2 {
  font-size: clamp(1.875rem, 4vw, var(--text-5xl));
}

h3 {
  font-size: clamp(1.125rem, 2.5vw, var(--text-2xl));
}

p {
  margin: 0 0 var(--space-4);
}

.eyebrow {
  display: inline-block;
  margin-bottom: var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--color-text-muted);
}

.eyebrow__code {
  font-family: var(--font-mono);
  opacity: 0.6;
}

.eyebrow--amber {
  color: var(--color-accent);
}

.eyebrow--amber .eyebrow__code {
  color: var(--color-accent);
  opacity: 0.6;
}

.lead {
  font-size: var(--text-lg);
  line-height: var(--line-relaxed);
  color: var(--color-text-soft);
  max-width: 32rem;
}

.text-serif {
  font-family: var(--font-serif);
}

.text-serif-accent {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--color-accent);
}

.text-mono {
  font-family: var(--font-mono);
}

/* =========================================================
   Utilities (max 10)
   ========================================================= */

.text-center    { text-align: center; }
.mx-auto        { margin-inline: auto; }
.max-w-sm       { max-width: 24rem; }
.max-w-md       { max-width: 28rem; }
.max-w-lg       { max-width: 32rem; }
.max-w-xl       { max-width: 36rem; }
.max-w-2xl      { max-width: 42rem; }
.max-w-3xl      { max-width: 48rem; }
.max-w-4xl      { max-width: 56rem; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}