/* ─── 1. Fonts ─────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,700;1,9..144,300&family=JetBrains+Mono:wght@400;500&family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&display=swap');

/* ─── 2. Design Tokens ──────────────────────────────────────────── */
:root {
  /* Surface */
  --paper:      #f5f7f9;    /* Glacier field — cold white */
  --paper-warm: #fdfcf9;    /* Archival insert */
  --bg-env:     #dde4ea;    /* Aerial mist */

  /* Type */
  --ink:        #191d22;    /* Surveyor's ink */
  --slate:      #4d5f72;    /* Weathered slate */
  --dim:        #8a9aaa;    /* Distant ridge */

  /* Brand */
  --accent:     #1a5f8e;    /* Deep glacier blue */
  --ice:        #90c5df;    /* Crevasse surface */
  --reticle:    #3a8fbf;    /* Targeting channel */

  /* Structure */
  --rule:       #c8d5df;    /* Survey line */
  --rule-light: #dde6ec;

  /* CV overlay */
  --bracket:    rgba(58,143,191,0.45);
  --scan:       rgba(58,143,191,0.03);
}

/* ─── 3. Base ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg-env);
  /* Contour-map grid — two orthogonal frequencies */
  background-image:
    linear-gradient(var(--rule-light) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-light) 1px, transparent 1px),
    linear-gradient(rgba(144,197,223,0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(144,197,223,0.12) 1px, transparent 1px);
  background-size: 160px 160px, 160px 160px, 32px 32px, 32px 32px;
  color: var(--ink);
  font-family: 'Libre Baskerville', Georgia, serif;
  line-height: 1.82;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ─── 4. Layout Container ───────────────────────────────────────── */
.container {
  max-width: 820px;
  margin: 56px auto;
  background: var(--paper);
  padding: 72px 96px;
  border: 1px solid var(--rule);
  /* Paper stack shadow */
  box-shadow:
    0 0 0 1px var(--rule-light),
    8px 8px 0 rgba(26,95,142,0.04),
    16px 16px 0 rgba(26,95,142,0.025);
  position: relative;
}

/* ── Computer-vision corner brackets ── */
.container::before,
.container::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  pointer-events: none;
}
.container::before {
  top: -1px; left: -1px;
  border-top: 2px solid var(--bracket);
  border-left: 2px solid var(--bracket);
}
.container::after {
  bottom: -1px; right: -1px;
  border-bottom: 2px solid var(--bracket);
  border-right: 2px solid var(--bracket);
}
/* Two more via a child pseudo-wrapper */
.container .cv-frame::before,
.container .cv-frame::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  pointer-events: none;
}
.container .cv-frame::before {
  top: -1px; right: -1px;
  border-top: 2px solid var(--bracket);
  border-right: 2px solid var(--bracket);
}
.container .cv-frame::after {
  bottom: -1px; left: -1px;
  border-bottom: 2px solid var(--bracket);
  border-left: 2px solid var(--bracket);
}
/* Invisible full-size overlay div that carries the other two corners */
.cv-frame {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* ─── 5. Metadata Bar ───────────────────────────────────────────── */
.metadata {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 22px;
  margin-bottom: 56px;
  gap: 12px;
}

.metadata-left {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--slate);
  line-height: 1.6;
}

.metadata-right {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.63rem;
  letter-spacing: 0.08em;
  color: var(--dim);
  text-align: right;
  line-height: 1.8;
  flex-shrink: 0;
}

.metadata-right span {
  display: block;
}

/* Nav link inside metadata */
.nav-link {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--reticle);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
  padding-bottom: 1px;
}
.nav-link:hover {
  color: var(--accent);
  border-bottom-color: var(--ice);
}

/* ─── 6. Footer ─────────────────────────────────────────────────── */
footer {
  margin-top: 72px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.63rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
}

.footer-mark {
  width: 10px;
  height: 10px;
  border: 1.5px solid var(--bracket);
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
}
.footer-mark::before,
.footer-mark::after {
  content: '';
  position: absolute;
  background: var(--bracket);
}
.footer-mark::before {
  width: 1px; height: 5px;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
}
.footer-mark::after {
  width: 5px; height: 1px;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
}

/* ─── 7. Article Typography ─────────────────────────────────────── */

#content h1 {
  font-family: 'Fraunces', serif;
  font-weight: 700;
  font-optical-sizing: auto;
  font-size: 3rem;
  line-height: 1.06;
  margin: 0 0 0.4rem;
  color: var(--ink);
  letter-spacing: -0.02em;
}

/* Subhead / dateline below h1 */
#content h1 + p em:first-child,
.dateline {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
  font-style: normal;
  display: block;
  margin-bottom: 2.8rem;
  margin-top: -0.2rem;
}

#content h2 {
  font-family: 'Fraunces', serif;
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--accent);
  margin-top: 3.6rem;
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0;
  letter-spacing: -0.01em;
}
#content h2::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule);
  margin-left: 18px;
}

#content h3 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--reticle);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-top: 2.2rem;
  margin-bottom: 0.6rem;
}

#content p {
  font-size: 1.02rem;
  margin-bottom: 1.5rem;
  text-align: justify;
  hyphens: auto;
  color: var(--ink);
}

/* ─── 8. Blockquote ─────────────────────────────────────────────── */
#content blockquote {
  margin: 2.8rem 0 2.8rem -24px;
  padding: 1.6rem 2rem;
  background: rgba(26,95,142,0.04);
  border-left: 3px solid var(--ice);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--accent);
  position: relative;
}
#content blockquote::before {
  content: attr(data-elevation, '');
  position: absolute;
  top: 0.5rem;
  right: 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--dim);
  font-style: normal;
}

/* ─── 9. Lists ──────────────────────────────────────────────────── */
#content ul, #content ol {
  list-style: none;
  padding-left: 0;
  margin: 1.8rem 0;
  counter-reset: obs;
}
#content li {
  margin-bottom: 0.9rem;
  padding-left: 36px;
  position: relative;
  counter-increment: obs;
}
#content li::before {
  position: absolute;
  left: 0;
  top: 3px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  color: var(--dim);
  letter-spacing: 0.06em;
}
#content ul li::before { content: '—'; }
#content ol li::before { content: counter(obs, decimal-leading-zero) '.'; }

/* ─── 10. Links ─────────────────────────────────────────────────── */
#content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--ice);
  transition: border-color 0.2s, color 0.2s;
}
#content a:hover {
  color: var(--reticle);
  border-bottom-color: var(--reticle);
}

/* ─── 11. Horizontal Rule ───────────────────────────────────────── */
#content hr {
  border: none;
  height: 1px;
  background: var(--rule);
  margin: 3rem 0;
}

/* ─── 12. Code ──────────────────────────────────────────────────── */
#content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  background: rgba(26,95,142,0.06);
  color: var(--accent);
  padding: 1px 5px;
  border-radius: 2px;
}
#content pre {
  background: rgba(25,29,34,0.95);
  color: #c8dae8;
  padding: 1.4rem 1.6rem;
  overflow-x: auto;
  margin: 2rem 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  line-height: 1.65;
}
#content pre code { background: transparent; color: inherit; padding: 0; }

/* ─── 13. Loading / Error States ───────────────────────────────── */
.loading {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
  animation: pulse 1.8s ease-in-out infinite;
}
.error {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: #8c3030;
  background: rgba(140,48,48,0.05);
  border-left: 3px solid rgba(140,48,48,0.4);
  padding: 1rem 1.2rem;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50%       { opacity: 1;   }
}

/* ─── 14. Updates-specific ──────────────────────────────────────── */
.updates-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.update-entry {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 0 24px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule-light);
  text-decoration: none;
  transition: background 0.15s;
  cursor: pointer;
}
.update-entry:hover { background: rgba(26,95,142,0.03); }

.update-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--dim);
  text-transform: uppercase;
  padding-top: 3px;
}

.update-title {
  font-family: 'Fraunces', serif;
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 400;
  letter-spacing: -0.01em;
}
.update-entry:hover .update-title {
  color: var(--reticle);
}

.update-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
  border: 1px solid var(--rule);
  padding: 1px 6px;
  border-radius: 1px;
  margin-left: 10px;
  vertical-align: middle;
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--reticle);
  text-decoration: none;
  margin-bottom: 2.8rem;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
  cursor: pointer;
}
.back-link:hover {
  color: var(--accent);
  border-bottom-color: var(--ice);
}
.back-arrow {
  font-size: 0.8rem;
  line-height: 1;
}

/* Page section transitions */
.page-section {
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0);   }
}

/* ─── 15. Responsive ────────────────────────────────────────────── */
@media (max-width: 1000px) {
  .container {
    margin: 0;
    padding: 48px 28px;
    box-shadow: none;
    border-left: none;
    border-right: none;
  }
  #content blockquote { margin-left: 0; }
  #content p { text-align: left; hyphens: none; }
  #content h1 { font-size: 2.2rem; }
  .metadata { flex-direction: column; gap: 8px; }
  .metadata-right { text-align: left; }
  .footer { flex-direction: column; gap: 8px; text-align: center; }
  .update-entry { grid-template-columns: 1fr; gap: 2px; }
  .update-date { font-size: 0.6rem; }
}