/* ─────────────────────────────────────────────────────────────
   summa.css — single stylesheet for summa.ac (prd_09 reset)
   No third-party fonts. System serif + synthetic small caps.
   Palette and rhythm derived from DESIGN.md / EMAIL.md.
   ───────────────────────────────────────────────────────────── */

:root {
  --color-bg:           #f5f0e8;  /* parchment (canonical email bg) */
  --color-bg-stone:     #ede8dc;  /* alternating section / lead */
  --color-text:         #1a1714;  /* body */
  --color-text-warm:    #0d0b09;  /* titles */
  --color-gold:         #7a5c1e;  /* primary accent */
  --color-gold-light:   #9a7830;  /* secondary accent / meta */
  --color-border:       #d8d0be;
  --color-border-warm:  #c8b888;
  --color-deep-red:     #7a1e1e;

  /* Body: humanist serif, falls through to Georgia (everywhere)
     and Times New Roman as a final guard. No web fonts. */
  --font-body:    Georgia, 'Times New Roman', 'Liberation Serif', serif;
  --font-display: Georgia, 'Times New Roman', 'Liberation Serif', serif;

  --max-width:     720px;
  --pad-h:         60px;
  --pad-h-mobile:  24px;
  --rhythm:        1.7;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: var(--rhythm);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
a:hover { border-bottom-color: var(--color-gold); }

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

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 24px 0;
}

/* ─── Container ──────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--pad-h);
}
@media (max-width: 640px) {
  .container { padding: 0 var(--pad-h-mobile); }
}

main { display: block; }

/* ─── Typography ─────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-text-warm);
  margin: 0;
  font-weight: 600;
}

p { margin: 0 0 16px 0; }

/* Synthetic small-caps: Georgia rendered in small-caps reads as the
   correct stylistic family on every device without a font download. */
.sc {
  font-variant-caps: all-small-caps;
  letter-spacing: 3px;
}

.eyebrow {
  font-variant-caps: all-small-caps;
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--color-gold-light);
  margin: 0 0 16px 0;
}

/* ─── Header — minimal breadcrumb only ───────────────────── */
.crumb {
  font-variant-caps: all-small-caps;
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--color-gold);
  display: inline-block;
  padding: 24px 0 0 0;
}
.crumb a { color: var(--color-gold); border-bottom: none; }
.crumb a:hover { color: var(--color-gold-light); }

/* ─── Logotype (S U M M A) ──────────────────────────────── */
.logotype {
  font-family: var(--font-display);
  font-size: 36px;
  letter-spacing: 12px;
  font-weight: 600;
  color: var(--color-text-warm);
  margin: 0 0 16px 0;
  line-height: 1;
}
.logotype__sub {
  font-style: italic;
  font-size: 14px;
  color: var(--color-gold-light);
  letter-spacing: normal;
  margin: 0 0 24px 0;
}

@media (max-width: 480px) {
  .logotype { font-size: 28px; letter-spacing: 8px; }
}

/* Short gold rule used throughout */
.gold-rule {
  border: 0;
  border-top: 1px solid var(--color-gold);
  width: 40px;
  margin: 24px auto;
}

/* ─── Hero ───────────────────────────────────────────────── */
.hero {
  padding: 56px 0 8px 0;
  text-align: center;
}
@media (max-width: 480px) {
  .hero { padding: 32px 0 4px 0; }
}

.hero__pitch {
  font-family: var(--font-body);
  font-size: 22px;
  line-height: 1.45;
  color: var(--color-text);
  margin: 12px auto 28px auto;
  max-width: 560px;
}
.hero__pitch em { font-style: italic; }

.hero__meta {
  font-variant-caps: all-small-caps;
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--color-gold-light);
  margin-top: 24px;
}

/* ─── Section rhythm ─────────────────────────────────────── */
.section {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}
.section--stone { background: var(--color-bg-stone); border-top-color: var(--color-border-warm); }
.section--lead  { background: var(--color-bg-stone); border-top: 2px solid var(--color-border-warm); }
.section--first { border-top: 0; }

.section__title {
  font-variant-caps: all-small-caps;
  font-size: 14px;
  letter-spacing: 5px;
  color: var(--color-gold-light);
  margin: 0 0 24px 0;
}

/* ─── Subscribe form (PRD spec markup) ───────────────────── */
.subscribe-band {
  text-align: center;
  margin: 24px auto 8px auto;
}
.subscribe-band__lede {
  font-style: italic;
  color: var(--color-gold-light);
  margin: 0 0 16px 0;
}
.subscribe-form {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  max-width: 460px;
  margin: 12px auto 8px auto;
}
.subscribe-form label {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.subscribe-form input[type="email"] {
  flex: 1 1 240px;
  min-height: 46px;
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--color-text);
  background: #fff;
  border: 1px solid var(--color-border-warm);
  border-radius: 0;
  outline: none;
}
.subscribe-form input[type="email"]:focus {
  border-color: var(--color-gold);
  box-shadow: 0 0 0 2px rgba(122, 92, 30, 0.18);
}
.subscribe-form button {
  min-height: 46px;
  padding: 10px 22px;
  font-family: var(--font-display);
  font-variant-caps: all-small-caps;
  font-size: 14px;
  letter-spacing: 3px;
  color: var(--color-bg);
  background: var(--color-gold);
  border: 1px solid var(--color-gold);
  border-radius: 0;
  cursor: pointer;
  transition: background-color 0.15s ease;
}
.subscribe-form button:hover { background: var(--color-text-warm); border-color: var(--color-text-warm); }
.subscribe-band__note {
  font-style: italic;
  font-size: 14px;
  color: var(--color-gold-light);
  margin: 12px 0 0 0;
}

/* ─── Pillars (3-up) ─────────────────────────────────────── */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
  margin: 16px 0;
}
@media (max-width: 720px) {
  .pillars { grid-template-columns: 1fr; gap: 28px; }
}
.pillar__title {
  font-variant-caps: all-small-caps;
  font-size: 16px;
  letter-spacing: 3px;
  color: var(--color-text-warm);
  margin: 0 0 10px 0;
}
.pillar p { margin: 0; font-size: 17px; line-height: 1.6; }

/* ─── Item preview (matches email render) ────────────────── */
.item {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 8px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}
.item:last-child { border-bottom: 0; }
.item__numeral {
  font-variant-caps: all-small-caps;
  font-size: 15px;
  letter-spacing: 1px;
  color: var(--color-gold-light);
  padding-top: 3px;
}
.item__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.3px;
  color: var(--color-text-warm);
  margin: 0 0 8px 0;
  line-height: 1.4;
}
.item__title a {
  color: var(--color-text-warm);
  border-bottom: 1px solid var(--color-border-warm);
}
.item__title a:hover { border-bottom-color: var(--color-gold); }
.item__meta {
  font-style: italic;
  color: var(--color-gold-light);
  font-size: 15px;
  margin: 0 0 4px 0;
}
.item__lang,
.item__discipline,
.item__method,
.item__type {
  font-variant-caps: all-small-caps;
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--color-gold-light);
  margin: 0 0 4px 0;
}
.item__discipline {
  color: var(--color-gold);
  font-weight: 600;
  letter-spacing: 2px;
}
.item__lang { font-style: italic; }
.item__summary {
  font-size: 16px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--color-text);
  margin: 8px 0;
}
.item__url {
  font-size: 14px;
  margin: 8px 0 0 0;
}
.item__url a { color: var(--color-gold-light); }
.item__flag {
  display: inline-block;
  font-variant-caps: all-small-caps;
  font-size: 11px;
  letter-spacing: 2px;
  padding: 2px 8px;
  border: 1px solid var(--color-border-warm);
  margin-bottom: 8px;
}
.item__flag--field-shifting {
  color: var(--color-deep-red);
  border-color: var(--color-deep-red);
}
.item__flag--notable {
  color: var(--color-gold);
  border-color: var(--color-gold);
}

/* ─── Lead Item (prd_08) ─────────────────────────────────── */
.lead {
  padding: 32px 40px;
  background: var(--color-bg-stone);
  border-top: 2px solid var(--color-border-warm);
  border-bottom: 1px solid var(--color-border);
}
.lead__label {
  font-variant-caps: all-small-caps;
  font-size: 13px;
  letter-spacing: 5px;
  color: var(--color-gold);
  margin: 0 0 16px 0;
}
.lead__frame {
  font-style: italic;
  font-size: 17px;
  line-height: 1.7;
  margin: 0 0 18px 0;
}
.lead__frame-tag {
  font-style: normal;
  color: var(--color-gold-light);
}

/* ─── Cluster sub-heading ────────────────────────────────── */
.cluster-label {
  font-variant-caps: all-small-caps;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--color-text-warm);
  margin: 24px 0 8px 0;
}

/* ─── About / lists ──────────────────────────────────────── */
.lang-tiers {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 28px;
  margin: 16px 0 24px 0;
}
@media (max-width: 720px) {
  .lang-tiers { grid-template-columns: 1fr; }
}
.lang-tier h3 {
  font-variant-caps: all-small-caps;
  font-size: 14px;
  letter-spacing: 3px;
  color: var(--color-gold);
  margin: 0 0 8px 0;
}
.lang-tier__lead {
  font-style: italic;
  font-size: 14px;
  color: var(--color-gold-light);
  margin: 0 0 10px 0;
}
.lang-tier ul {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 16px;
  line-height: 1.6;
}
.lang-tier li { padding: 2px 0; }

.disciplines {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin: 16px 0 24px 0;
}
@media (max-width: 720px) {
  .disciplines { grid-template-columns: 1fr; }
}
.disciplines h3 {
  font-variant-caps: all-small-caps;
  font-size: 14px;
  letter-spacing: 3px;
  color: var(--color-gold);
  margin: 0 0 10px 0;
}
.disciplines dl { margin: 0; }
.disciplines dt {
  font-weight: 600;
  color: var(--color-text-warm);
  margin: 12px 0 2px 0;
}
.disciplines dd {
  margin: 0;
  font-size: 16px;
  color: var(--color-text);
  font-weight: 300;
}

.source-registry {
  margin: 16px 0;
}
.source-registry h3 {
  font-variant-caps: all-small-caps;
  font-size: 14px;
  letter-spacing: 3px;
  color: var(--color-gold);
  margin: 16px 0 6px 0;
}
.source-registry ul {
  list-style: none;
  margin: 0 0 16px 0;
  padding: 0;
}
.source-registry li {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  padding: 6px 0;
  font-size: 16px;
}
.source-registry li span.muted { color: var(--color-gold-light); font-style: italic; }

/* ─── Archive list ───────────────────────────────────────── */
.archive-list { list-style: none; margin: 24px 0; padding: 0; }
.archive-row {
  display: block;
  padding: 24px 0;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}
.archive-row:hover { background: rgba(122, 92, 30, 0.04); }
.archive-row__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 8px;
}
.archive-row__issue {
  font-variant-caps: all-small-caps;
  font-size: 14px;
  letter-spacing: 3px;
  color: var(--color-gold);
}
.archive-row__date {
  font-style: italic;
  font-size: 14px;
  color: var(--color-gold-light);
}
.archive-row__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text-warm);
  margin: 6px 0 4px 0;
  line-height: 1.4;
}
.archive-row__teaser {
  font-size: 16px;
  color: var(--color-text);
  margin: 4px 0 0 0;
}
.archive-row__counts {
  font-style: italic;
  font-size: 14px;
  color: var(--color-gold-light);
  margin: 6px 0 0 0;
}

/* ─── Generic prose blocks ───────────────────────────────── */
.prose p { font-size: 17px; line-height: 1.7; max-width: 64ch; }
.prose p + p { margin-top: 12px; }
.prose h2 {
  font-variant-caps: all-small-caps;
  font-size: 16px;
  letter-spacing: 4px;
  color: var(--color-gold);
  margin: 36px 0 14px 0;
}

.note {
  font-style: italic;
  font-size: 15px;
  color: var(--color-gold-light);
  margin: 16px 0;
}

/* ─── Footer ─────────────────────────────────────────────── */
.site-footer {
  padding: 36px 0 40px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
  text-align: center;
}
.site-footer p {
  font-style: italic;
  font-size: 14px;
  color: var(--color-gold-light);
  margin: 0;
}
.site-footer a { color: var(--color-gold-light); }

/* ─── Subscribed page ────────────────────────────────────── */
.thanks {
  padding: 64px 0;
  text-align: center;
}
.thanks p {
  font-size: 18px;
  line-height: 1.7;
  margin: 0 auto 18px auto;
  max-width: 540px;
}
.thanks__primary { font-size: 22px; font-style: italic; }

/* ─── Accessibility helpers ──────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* ─── prd_10 — WhatsApp / Copy-link share box ────────────── */
.share-box {
  text-align: center;
  margin: 28px auto 12px auto;
  padding: 24px 28px;
  background: var(--color-bg-stone);
  border: 1px solid var(--color-border);
}
.share-box__lede {
  font-style: italic;
  color: var(--color-gold-light);
  font-size: 15px;
  margin: 0 0 14px 0;
}
.share-box__buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.share-box__wa,
.share-box__copy {
  display: inline-block;
  font-family: var(--font-display);
  font-variant-caps: all-small-caps;
  font-size: 14px;
  letter-spacing: 2px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 4px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  min-height: 44px;
  line-height: 1.2;
}
.share-box__wa {
  background: #25D366;            /* WhatsApp green */
  color: #ffffff;
  border-color: #25D366;
}
.share-box__wa:hover {
  background: #1ea750;
  border-color: #1ea750;
  border-bottom-color: #1ea750;   /* override generic a:hover */
}
.share-box__copy {
  background: #ffffff;
  color: var(--color-text);
  border-color: var(--color-border-warm);
  font-family: var(--font-display);
}
.share-box__copy:hover {
  background: var(--color-bg);
  border-color: var(--color-gold);
}
@media (max-width: 480px) {
  .share-box__buttons { flex-direction: column; }
  .share-box__wa, .share-box__copy { width: 100%; }
}