/*
 * Billy blog — "Autónomo's ledger" design, v3.
 *
 * The signature is the invoice-chain dateline (POST-YYYY-NN · huella xxxx…yyyy
 * · date), rendered exactly as the app stores VeriFactu records. It lives in
 * ONE place per post — the dateline at the top of the article body. The
 * sticky rail no longer duplicates it; it only carries seccion + lectura +
 * "back" so it does not compete for the signature.
 *
 * No cards, no dark boxes, no rounded corners on content, no rotated stamps.
 * One accent color (Spanish tax-stamp orange), one verified-green for chain
 * hashes only. Wide margins over decoration.
 */

:root {
  /* palette */
  --paper: #F5F1E8;
  --paper-warm: #EEE7D3;
  --ink: #1A1410;
  --ink-soft: #3A302A;
  --carbon: #5A5045;
  --rule: #D8CFB9;
  --rule-strong: #B8AE95;
  --label: #8A7E67;          /* darker pencil label — passes 3:1 on paper */
  --stamp: #B84A20;
  --stamp-hover: #8F3919;
  --register: #2E5C4F;

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

  /* space */
  --rail-w: 200px;
  --content-w: 640px;
  --shell-max: 1080px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 18px/1.75 var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-optical-sizing: auto;
}
img { max-width: 100%; height: auto; display: block; }
a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--rule-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s ease, color 0.15s ease;
}
a:hover {
  color: var(--stamp);
  text-decoration-color: var(--stamp);
}
:focus-visible {
  outline: 2px solid var(--stamp);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ============================================================ */
/*  HEADER                                                       */
/* ============================================================ */
.hdr {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}
.hdr__inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 22px 32px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 32px;
}
.hdr__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: var(--ink);
  text-decoration: none;
  font: 900 22px/1 var(--font-display);
  letter-spacing: -0.015em;
  white-space: nowrap;
}
.hdr__brand:hover { color: var(--ink); text-decoration: none; }
.hdr__brand-mark {
  color: var(--stamp);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  transform: translateY(-2px);
  white-space: nowrap;
}
.hdr__nav {
  display: flex;
  gap: 28px;
  align-items: baseline;
  font: 500 13px/1.4 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.hdr__nav a {
  color: var(--carbon);
  text-decoration: none;
  padding: 12px 0;              /* 44px hit area */
  white-space: nowrap;
}
.hdr__nav a:hover { color: var(--stamp); text-decoration: none; }
.hdr__cta {
  color: var(--stamp) !important;
  border-bottom: 1px solid var(--stamp);
  padding-bottom: 10px !important;
}
.hdr__cta:hover { color: var(--stamp-hover) !important; border-bottom-color: var(--stamp-hover); }

/* ============================================================ */
/*  SHELL — sticky meta rail + content                           */
/* ============================================================ */
.shell {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 64px 32px 96px;
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  gap: 48px;
}
.rail {
  position: sticky;
  top: 32px;
  align-self: start;
  font: 500 12px/1.6 var(--font-mono);
  color: var(--carbon);
  letter-spacing: 0.04em;
}
.rail__block { margin-bottom: 22px; }
.rail__label {
  color: var(--label);          /* darker: passes 3:1 for tracked caps */
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 10px;
  display: block;
  margin-bottom: 2px;
}
.rail__value { color: var(--ink); }
.rail__value--stamp { color: var(--stamp); }
.rail__back {
  display: inline-block;
  margin-top: 24px;
  padding: 16px 0 12px;         /* larger hit area on mobile */
  border-top: 1px solid var(--rule);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--carbon);
  text-decoration: none;
}
.rail__back:hover { color: var(--stamp); text-decoration: none; }

.main {
  max-width: var(--content-w);
  min-width: 0;
}

/* ============================================================ */
/*  DATELINE — the ONLY home for the huella. Signature.          */
/* ============================================================ */
.dateline {
  font: 500 13px/1.6 var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--carbon);
  padding: 10px 0 14px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 0 0 28px;
  align-items: baseline;
}
.dateline > * { display: inline-flex; align-items: baseline; gap: 6px; }
.dateline__id { color: var(--ink); font-weight: 600; }
.dateline__sep { color: var(--rule-strong); }
.dateline__hash-label {
  color: var(--label);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 11px;
}
.dateline__hash {
  color: var(--register);
  font-weight: 600;
  border-bottom: 1px dotted var(--register);
  padding-bottom: 1px;
}
.dateline__date { color: var(--ink); font-weight: 500; }

@keyframes stamp-in {
  0% { opacity: 0; transform: translateY(2px) scale(0.98); letter-spacing: 0.12em; }
  60% { opacity: 1; }
  100% { opacity: 1; transform: translateY(0) scale(1); letter-spacing: 0.04em; }
}
@media (prefers-reduced-motion: no-preference) {
  .dateline { animation: stamp-in 0.6s cubic-bezier(.2, .8, .2, 1) both; }
}

/* ============================================================ */
/*  POST HEADER + PROSE                                          */
/* ============================================================ */
.post-header { margin-bottom: 40px; }
.post-title {
  margin: 0;
  font: 800 44px/1.06 var(--font-display);
  letter-spacing: -0.02em;
  color: var(--ink);
  font-optical-sizing: auto;
}
.post-lead {
  margin: 20px 0 0;
  font: 400 20px/1.55 var(--font-body);
  color: var(--ink-soft);
  font-style: italic;
  max-width: 560px;
}

.prose { font-size: 18px; line-height: 1.75; color: var(--ink); }
.prose > p:first-child::first-letter {
  font-family: var(--font-display);
  font-weight: 900;
  float: left;
  font-size: 62px;
  line-height: 0.9;
  padding: 6px 10px 0 0;
  color: var(--stamp);
}
.prose p { margin: 20px 0; line-height: 1.75; }
.prose h2 {
  margin: 56px 0 12px;
  font: 700 28px/1.2 var(--font-display);
  letter-spacing: -0.015em;
  color: var(--ink);
  position: relative;
  padding-top: 20px;
}
.prose h2::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 44px; height: 1px;
  background: var(--stamp);
}
.prose h3 {
  margin: 36px 0 10px;
  font: 600 20px/1.4 var(--font-body);
  color: var(--ink);
}
.prose ul, .prose ol { margin: 20px 0; padding-left: 24px; line-height: 1.75; }
.prose li { margin: 10px 0; }
.prose li::marker { color: var(--stamp); font-family: var(--font-mono); font-size: 0.85em; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose em { font-style: italic; color: var(--ink-soft); }
.prose code {
  background: var(--paper-warm);
  color: var(--register);
  padding: 1px 6px;
  font: 500 15px/1 var(--font-mono);
  border: 1px solid var(--rule);
}

.prose blockquote {
  margin: 36px 0;
  padding: 6px 0 6px 24px;
  border-left: 3px solid var(--stamp);
  font: italic 400 22px/1.55 var(--font-body);
  color: var(--ink-soft);
}
.prose blockquote p { margin: 0; }

/* Aside — a marginal ledger note. NOT a card. Left-rule only, no fill. */
.aside {
  margin: 40px 0;
  padding: 4px 0 4px 24px;
  border-left: 2px solid var(--stamp);
  background: transparent;      /* was tinted — now flat */
}
.aside__label {
  font: 500 11px/1.4 var(--font-mono);
  color: var(--stamp);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin: 0 0 10px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.aside__label::before {
  content: "§";
  color: var(--register);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
  transform: translateY(2px);
}
.aside p { margin: 0; font-size: 17px; color: var(--ink); line-height: 1.7; }
.aside p + p { margin-top: 12px; }

/* ============================================================ */
/*  POST FOOTER — sign-off + inline CTA                          */
/* ============================================================ */
.signoff {
  margin: 64px 0 0;
  padding: 32px 0 0;
  border-top: 1px solid var(--ink);
  font: italic 400 17px/1.6 var(--font-body);
  color: var(--carbon);
}
.signoff strong { color: var(--ink); font-style: normal; font-weight: 600; }
.signoff__row {
  margin-top: 20px;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  align-items: baseline;
}
.link-stamp {
  font: 600 14px/1.4 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--stamp);
  text-decoration: none;
  border-bottom: 1px solid var(--stamp);
  padding: 14px 0;              /* 44px hit area */
  display: inline-block;
}
.link-stamp:hover { color: var(--stamp-hover); border-bottom-color: var(--stamp-hover); }
.link-quiet {
  font: 500 14px/1.4 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--carbon);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-strong);
  padding: 14px 0;
  display: inline-block;
}
.link-quiet:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ============================================================ */
/*  INDEX — ledger-style ruled rows                              */
/* ============================================================ */
.index-hero {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 96px 32px 32px;
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  gap: 48px;
  align-items: end;
}
.index-hero__eyebrow {
  font: 500 12px/1.6 var(--font-mono);
  color: var(--stamp);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin: 0;
}
.index-hero__title {
  grid-column: 2;
  margin: 0;
  font: 800 68px/0.98 var(--font-display);
  letter-spacing: -0.03em;
  color: var(--ink);
  max-width: 780px;
  font-optical-sizing: auto;
}
.index-hero__title em {
  font-style: italic;
  font-weight: 400;
  color: var(--ink-soft);
}
.index-hero__lead {
  grid-column: 2;
  margin: 24px 0 0;
  font: 400 20px/1.55 var(--font-body);
  color: var(--ink-soft);
  max-width: 620px;
}

.index-hero__rail { align-self: start; padding-top: 12px; }

.index-rule {
  max-width: var(--shell-max);
  margin: 48px auto 0;
  padding: 0 32px;
}
.index-rule::before {
  content: "";
  display: block;
  height: 1px;
  background: var(--rule);
}

.entries {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 8px 32px 96px;
}
.entry {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr) auto;
  gap: 48px;
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
  position: relative;
  transition: background-color 0.15s ease;
}
.entry:hover {
  text-decoration: none;
  background: linear-gradient(90deg, transparent 0, var(--paper-warm) 30%, var(--paper-warm) 70%, transparent 100%);
}
.entry:hover .entry__title { color: var(--stamp); }
.entry:hover .entry__arrow { transform: translateX(4px); color: var(--stamp); }

.entry__meta {
  font: 500 12px/1.6 var(--font-mono);
  color: var(--carbon);
  letter-spacing: 0.04em;
}
.entry__meta-line { display: block; }
.entry__meta-line--id { color: var(--ink); font-weight: 600; }
.entry__meta-line--hash { color: var(--register); font-weight: 600; }
.entry__meta-line--section {
  color: var(--stamp);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  margin-top: 8px;
}

.entry__body { min-width: 0; }
.entry__title {
  margin: 0;
  font: 700 28px/1.18 var(--font-display);
  letter-spacing: -0.015em;
  color: var(--ink);
  transition: color 0.15s ease;
}
.entry__lead {
  margin: 12px 0 0;
  font: 400 17px/1.55 var(--font-body);
  color: var(--ink-soft);
}

.entry__arrow {
  align-self: center;
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--rule-strong);
  transition: transform 0.2s ease, color 0.15s ease;
  padding-left: 8px;
}

/* ============================================================ */
/*  INDEX FOOTER — a signed ledger entry, no dark boxes          */
/* ============================================================ */
.index-close {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 24px 32px 96px;
}
.index-close__inner {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}
.index-close__label {
  font: 500 11px/1.6 var(--font-mono);
  color: var(--label);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding-top: 12px;
}
.index-close__body h2 {
  margin: 0;
  font: 800 42px/1.08 var(--font-display);
  letter-spacing: -0.02em;
  color: var(--ink);
}
.index-close__body p {
  margin: 20px 0 28px;
  font: 400 19px/1.55 var(--font-body);
  color: var(--ink-soft);
  max-width: 540px;
}
.index-close__row {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  align-items: baseline;
}

/* ============================================================ */
/*  FOOTER                                                        */
/* ============================================================ */
.ftr {
  border-top: 1px solid var(--rule);
  padding: 32px 32px 40px;
  margin-top: 24px;
}
.ftr__inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  gap: 48px;
  align-items: baseline;
  font: 500 11px/1.6 var(--font-mono);
  color: var(--carbon);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.ftr a {
  color: var(--carbon);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding: 12px 0;              /* 44px hit area */
  display: inline-block;
}
.ftr a:hover { color: var(--stamp); border-bottom-color: var(--stamp); }

/* ============================================================ */
/*  RESPONSIVE                                                    */
/* ============================================================ */
@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; gap: 20px; padding: 40px 24px 64px; }
  .rail { position: static; display: flex; flex-wrap: wrap; gap: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--rule); }
  .rail__block { margin-bottom: 0; }
  .rail__back { margin-top: 0; padding: 12px 0; border-top: none; width: 100%; }

  .index-hero { grid-template-columns: 1fr; padding: 56px 24px 24px; gap: 16px; }
  .index-hero__title { grid-column: 1; font-size: 44px; }
  .index-hero__lead { grid-column: 1; font-size: 18px; }
  .index-hero__rail { align-self: start; padding-top: 0; }

  .entry { grid-template-columns: 1fr; gap: 12px; padding: 28px 0; }
  .entry__meta { display: flex; flex-wrap: wrap; gap: 12px; font-size: 11px; }
  .entry__meta-line--section { margin-top: 0; }
  .entry__arrow { display: none; }

  .index-close { padding: 8px 24px 64px; }
  .index-close__inner { grid-template-columns: 1fr; gap: 12px; }
  .index-close__body h2 { font-size: 32px; }

  .ftr__inner { grid-template-columns: 1fr; gap: 12px; }
  .ftr { padding: 24px 24px 32px; }

  .post-title { font-size: 34px; }
  .post-lead { font-size: 17px; }
  .prose { font-size: 17px; }
  .prose p, .prose ul, .prose ol { line-height: 1.75; }
  .prose > p:first-child::first-letter { font-size: 48px; padding: 4px 8px 0 0; }
  .prose h2 { font-size: 24px; margin-top: 44px; }
  .prose blockquote { font-size: 19px; margin: 28px 0; }

  .hdr__inner { padding: 14px 20px; gap: 12px; flex-wrap: wrap; }
  .hdr__brand { font-size: 20px; }
  .hdr__nav { gap: 14px; font-size: 11px; }
  .signoff__row { gap: 20px; }
  .link-stamp, .link-quiet { padding: 12px 0; }
}

/* Hide the mono SIF chip on very narrow screens — it wrapped ugly */
@media (max-width: 420px) {
  .hdr__brand-mark { display: none; }
  .hdr__nav { width: 100%; justify-content: flex-start; }
  /* Ship-note from R2: bump nav + footer link tap targets over 44px */
  .hdr__nav a { padding: 15px 0; }
  .ftr a { padding: 14px 0; }
}