/* ===========================================================
   Letters from Houghton — archive stylesheet
   Palette: pale airmail-paper blue, ink navy, oxblood + cobalt
   (the classic red/blue airmail edge stripe), postmark gold.
   =========================================================== */

/* No external font CDN — using system font stacks so the page loads
   reliably everywhere, including mainland China where Google Fonts
   domains (fonts.googleapis.com / fonts.gstatic.com) are blocked. */

:root {
  --paper: #E8EEF0;
  --paper-deep: #DCE6E8;
  --card: #F2F6F5;
  --ink: #16211F;
  --ink-soft: #3C4C4F;
  --oxblood: #8B2C22;
  --cobalt: #1F4E79;
  --gold: #A9862F;
  --hairline: #9FB0B3;
  --stripe-w: 10px;

  --font-display: Georgia, 'Nanum Myeongjo', 'Songti SC', 'STSong', serif;
  --font-meta: 'Courier New', Courier, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
  -webkit-font-smoothing: antialiased;
}

/* Subtle paper texture via layered gradients */
body {
  background-image:
    radial-gradient(circle at 15% 8%, rgba(31,78,121,0.05), transparent 40%),
    radial-gradient(circle at 85% 90%, rgba(139,44,34,0.05), transparent 40%);
}

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

.wrap {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 20px 80px;
}

/* ---------- Header ---------- */

.site-header {
  padding: 14px 0 28px;
  border-bottom: 3px double var(--hairline);
  margin-bottom: 40px;
  position: relative;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 28px;
  margin: 0 0 24px;
}

.site-nav-link {
  font-family: var(--font-meta);
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 4px 0;
  color: var(--ink);
  border: none;
  border-bottom: 1.5px solid transparent;
  transition: all 0.15s ease;
}

.site-nav-link:hover {
  color: var(--cobalt);
  border-bottom-color: var(--hairline);
}

.site-nav-link.active {
  color: var(--ink);
  border-bottom-color: var(--ink);
  font-weight: 700;
}

.site-header .airmail-edge {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 6px;
  background: repeating-linear-gradient(
    -45deg,
    var(--oxblood) 0 14px,
    var(--paper) 14px 20px,
    var(--cobalt) 20px 34px,
    var(--paper) 34px 40px
  );
}

  font-size: 13.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cobalt);
  margin: 18px 0 10px;
}

.site-title {
  font-size: clamp(38px, 6.2vw, 58px);
  font-weight: 600;
  line-height: 1.05;
  margin: 0 0 12px;
  color: var(--ink);
}

.site-subtitle {
  font-size: 18px;
  font-style: italic;
  color: var(--ink-soft);
  max-width: 52ch;
  line-height: 1.55;
  margin: 0;
}

/* ---------- Language selector ---------- */

.lang-select {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.lang-select .lang-label {
  font-family: var(--font-meta);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-right: 4px;
}

.lang-btn {
  display: inline-block;
  text-decoration: none;
  font-family: var(--font-meta);
  font-size: 14.5px;
  letter-spacing: 0.03em;
  padding: 8px 16px;
  border: 1.5px solid var(--hairline);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.15s ease;
}

.lang-btn:hover {
  border-color: var(--cobalt);
  color: var(--cobalt);
}

.lang-btn.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

/* ---------- Entry list ---------- */

.entry-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.entry {
  position: relative;
  background: var(--card);
  border: 1.5px solid var(--hairline);
  padding: 28px 28px 24px 34px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.entry::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 0;
  width: var(--stripe-w);
  background: repeating-linear-gradient(
    -45deg,
    var(--oxblood) 0 8px,
    var(--card) 8px 11px,
    var(--cobalt) 11px 19px,
    var(--card) 19px 22px
  );
}

.entry:hover {
  transform: translateX(2px);
  box-shadow: -2px 4px 0 rgba(31,42,46,0.06);
}

.entry-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

/* ---------- Postmark (SVG) ---------- */

.postmark-wrap {
  flex-shrink: 0;
  width: 178px;
  height: 100px;
}

.postmark-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.postmark-svg .pm-ring {
  fill: none;
  stroke: var(--pm-ink, var(--gold));
}

.postmark-svg .pm-arc-text {
  font-family: var(--font-meta);
  font-weight: 700;
  fill: var(--pm-ink, var(--gold));
  letter-spacing: 1.5px;
}

.postmark-svg .pm-date-box {
  fill: none;
  stroke: var(--pm-ink, var(--gold));
}

.postmark-svg .pm-date-text {
  font-family: var(--font-meta);
  font-weight: 700;
  fill: var(--pm-ink, var(--gold));
  text-anchor: middle;
}

.postmark-svg .pm-wave {
  fill: none;
  stroke: var(--pm-ink, var(--gold));
  stroke-linecap: round;
}

.postmark-svg .pm-dot {
  fill: var(--pm-ink, var(--gold));
}

/* colour rotation so successive postmarks in the log don't all match */
.entry:nth-of-type(3n+1) .postmark-svg { --pm-ink: var(--gold); }
.entry:nth-of-type(3n+2) .postmark-svg { --pm-ink: var(--cobalt); }
.entry:nth-of-type(3n)   .postmark-svg { --pm-ink: var(--oxblood); }

.entry-title {
  font-size: 27px;
  font-weight: 600;
  margin: 2px 0 6px;
  color: var(--ink);
}

.entry-title a { border-bottom: 1px solid transparent; }
.entry-title a:hover { border-bottom-color: var(--oxblood); color: var(--oxblood); }

.entry-date-full {
  font-family: var(--font-meta);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.entry-excerpt {
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0 0 18px;
  max-width: 56ch;
}

/* ---------- Support banner ---------- */

.support-banner {
  margin-top: 48px;
  padding: 28px 24px;
  border: 1.5px dashed var(--hairline);
  text-align: center;
  background: var(--card);
}

.support-text {
  font-size: 16.5px;
  font-style: italic;
  color: var(--ink-soft);
  margin: 0 0 16px;
  max-width: 50ch;
  margin-left: auto;
  margin-right: auto;
}

.support-btn {
  display: inline-block;
  font-family: var(--font-meta);
  font-size: 14px;
  letter-spacing: 0.03em;
  padding: 11px 24px;
  border: 1.5px solid var(--oxblood);
  color: var(--oxblood);
  background: var(--paper);
  transition: all 0.15s ease;
}

.support-btn:hover {
  background: var(--oxblood);
  color: var(--paper);
}

/* ---------- Subscribe banner (links to subscribe.html) ---------- */

.subscribe-banner {
  margin-top: 44px;
  padding: 28px 24px;
  border: 1.5px solid var(--hairline);
  background: var(--card);
  text-align: center;
}

.subscribe-heading {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--ink);
}

.subscribe-text {
  font-size: 15.5px;
  color: var(--ink-soft);
  max-width: 52ch;
  margin: 0 auto 18px;
  line-height: 1.6;
}

.subscribe-btn {
  display: inline-block;
  font-family: var(--font-meta);
  font-size: 14px;
  letter-spacing: 0.03em;
  padding: 11px 24px;
  border: 1.5px solid var(--cobalt);
  color: var(--cobalt);
  background: var(--paper);
  transition: all 0.15s ease;
}

.subscribe-btn:hover {
  background: var(--cobalt);
  color: var(--paper);
}

/* ---------- Essays page ---------- */

.essays-section {
  margin-top: 44px;
}

.essays-heading {
  font-family: var(--font-meta);
  font-size: 13.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cobalt);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1.5px solid var(--hairline);
}

.essay-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.essay-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 4px;
  border-bottom: 1px dashed var(--hairline);
}

.essay-item:last-child { border-bottom: none; }

.essay-date {
  font-family: var(--font-meta);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-transform: uppercase;
  flex-shrink: 0;
  width: 130px;
}

.essay-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.essay-title:hover {
  color: var(--oxblood);
  border-bottom-color: var(--oxblood);
}

.essay-external {
  font-size: 13px;
  color: var(--gold);
}

/* ---------- Footer ---------- */

.site-footer {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1.5px solid var(--hairline);
  font-family: var(--font-meta);
  font-size: 13px;
  color: var(--ink-soft);
  text-align: center;
  letter-spacing: 0.03em;
}

/* ---------- Responsive ---------- */

@media (max-width: 560px) {
  .wrap { padding: 0 16px 60px; }
  .site-header { padding: 40px 0 24px; }
  .entry { padding: 22px 18px 20px 26px; }
  .postmark-wrap { width: 138px; height: 78px; }
  .essay-item { flex-wrap: wrap; gap: 4px 12px; }
  .essay-date { width: auto; }
  .entry-title { font-size: 20px; }
  .entry-top { flex-wrap: wrap; }

  /* Turn the nav into a bordered, segmented tab bar (one row, five
     equal cells) so labels stay legible and evenly spaced instead of
     wrapping into loose, right-aligned lines of varying width. */
  .site-nav {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
    border: 1.5px solid var(--hairline);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 20px;
  }

  .site-nav-link {
    text-align: center;
    padding: 9px 3px;
    font-size: 10.5px;
    line-height: 1.3;
    letter-spacing: 0.01em;
    border: none;
    border-right: 1px solid var(--hairline);
    background: var(--card);
  }

  .site-nav-link:last-child {
    border-right: none;
  }

  .site-nav-link.active {
    background: var(--ink);
    color: var(--paper);
  }
}

/* ---------- Accessibility ---------- */

:focus-visible {
  outline: 2px solid var(--cobalt);
  outline-offset: 2px;
}

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