/* ============================================================
   BLUEPRINT — design tokens
   A technical-drawing aesthetic: graph-paper grid, corner-bracket
   frames like crop marks on a schematic, and title-block metadata
   tables borrowed from engineering drawings.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap');

:root {
  --navy-deep: #0b2038;
  --navy-mid: #102c4a;
  --navy-panel: #132f4f;
  --grid-line: rgba(150, 198, 236, 0.10);
  --grid-line-strong: rgba(150, 198, 236, 0.18);
  --ink: #dfe9f5;
  --ink-dim: #8ea4bd;
  --ink-faint: #5d7086;
  --amber: #f0a83c;
  --amber-dim: #b4812f;
  --cyan: #5fd0e0;
  --danger: #e2604f;
  --border: rgba(150, 198, 236, 0.22);
  --radius: 2px;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--navy-deep);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

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

h1, h2, h3, h4 {
  font-family: var(--mono);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 0.5em;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(11,32,56,0.92), rgba(11,32,56,0.75));
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header .bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
}
.brand .mark {
  border-radius: 3px;
  flex-shrink: 0;
}
.brand .tagline {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--ink-dim);
  display: none;
}
@media (min-width: 640px) {
  .brand .tagline { display: inline; }
}
nav.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
nav.main-nav a {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-dim);
  padding: 8px 12px;
  border-radius: var(--radius);
  text-decoration: none;
}
nav.main-nav a:hover { color: var(--ink); background: var(--grid-line-strong); }
nav.main-nav a.active { color: var(--navy-deep); background: var(--amber); }

.search-form {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.search-form input {
  background: transparent;
  border: none;
  color: var(--ink);
  padding: 7px 10px;
  font-family: var(--mono);
  font-size: 0.82rem;
  width: 140px;
}
.search-form input:focus { outline: none; }
.search-form button {
  background: var(--navy-panel);
  border: none;
  color: var(--ink-dim);
  padding: 7px 10px;
  cursor: pointer;
  font-family: var(--mono);
}
.search-form button:hover { color: var(--amber); }

/* ---------- Corner-bracket panel (signature element) ---------- */
.bracket-panel {
  position: relative;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(19,47,79,0.55), rgba(19,47,79,0.35));
  padding: 22px;
}
.bracket-panel::before,
.bracket-panel::after,
.bracket-panel .bl,
.bracket-panel .br {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  border-color: var(--amber);
  border-style: solid;
  opacity: 0.85;
}
.bracket-panel::before { top: -1px; left: -1px; border-width: 2px 0 0 2px; }
.bracket-panel::after { top: -1px; right: -1px; border-width: 2px 2px 0 0; }
.bracket-panel .bl { bottom: -1px; left: -1px; border-width: 0 0 2px 2px; }
.bracket-panel .br { bottom: -1px; right: -1px; border-width: 0 2px 2px 0; }

.main-content { padding-top: 40px; padding-bottom: 60px; }
.main-content.no-top-pad { padding-top: 0; }

/* ---------- Hero ---------- */
.hero {
  margin-top: -40px;
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--border);
}
.hero-id {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
  margin-bottom: 14px;
  letter-spacing: 0.08em;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  max-width: 16ch;
  line-height: 1.08;
}
.hero h1 .accent { color: var(--amber); }
.hero p.lede {
  font-family: var(--sans);
  color: var(--ink-dim);
  max-width: 56ch;
  font-size: 1.05rem;
  margin: 14px 0 28px;
}
.hero-stats {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  width: fit-content;
}
.hero-stats div {
  padding: 10px 22px;
  border-right: 1px solid var(--border);
  font-family: var(--mono);
}
.hero-stats div:last-child { border-right: none; }
.hero-stats .num { font-size: 1.3rem; color: var(--amber); display: block; }
.hero-stats .lbl { font-size: 0.68rem; color: var(--ink-dim); text-transform: uppercase; letter-spacing: 0.08em; }

/* ---------- Section headers ---------- */
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 56px 0 20px;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 10px;
}
.section-head h2 { font-size: 1.1rem; margin: 0; }
.section-head .view-all { font-family: var(--mono); font-size: 0.8rem; color: var(--ink-dim); }

/* ---------- Grids & cards ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}
.card {
  position: relative;
  border: 1px solid var(--border);
  background: rgba(19,47,79,0.35);
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--amber-dim); transform: translateY(-2px); }
.card a.stretched { text-decoration: none; color: inherit; }
.card .thumb {
  aspect-ratio: 16/9;
  background: var(--navy-mid) center/cover no-repeat;
  position: relative;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}
.card .thumb.no-thumb {
  background:
    repeating-linear-gradient(135deg, rgba(150,198,236,0.06) 0 2px, transparent 2px 16px),
    var(--navy-mid);
}
.card .thumb .duration {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background: rgba(11,32,56,0.85);
  color: var(--amber);
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 2px 6px;
  border: 1px solid var(--border);
}
.card .thumb .play {
  width: 44px; height: 44px;
  border: 1.5px solid var(--amber);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--amber);
  background: rgba(11,32,56,0.5);
  font-size: 0.8rem;
  padding-left: 3px; /* optically center the ▶ glyph */
  transition: transform 0.15s ease, background 0.15s ease;
}
.card:hover .thumb .play { transform: scale(1.08); background: rgba(11,32,56,0.75); }
.card .body { padding: 14px 16px 18px; flex: 1; display: flex; flex-direction: column; }
.card .id-tag { font-family: var(--mono); font-size: 0.68rem; color: var(--ink-faint); letter-spacing: 0.06em; margin-bottom: 6px; }
.card h3 { font-size: 1rem; margin: 0 0 8px; }
.card p.summary { color: var(--ink-dim); font-size: 0.88rem; margin: 0 0 12px; flex: 1; }
.card .meta { display: flex; justify-content: space-between; align-items: center; font-family: var(--mono); font-size: 0.72rem; color: var(--ink-faint); }
.tag-chip {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--cyan);
  border: 1px solid rgba(95,208,224,0.3);
  padding: 2px 7px;
  margin: 0 6px 6px 0;
}
.tag-chip:hover { background: rgba(95,208,224,0.1); text-decoration: none; }
.tag-chip.active { background: var(--cyan); color: var(--navy-deep); }

/* ---------- Tag filter bar ---------- */
.tag-bar { margin: 18px 0 30px; display: flex; flex-wrap: wrap; gap: 0; }

/* ---------- Title block (detail pages) ---------- */
.title-block {
  border: 1px solid var(--border);
  margin-bottom: 32px;
}
.title-block .tb-main { padding: 26px 26px 18px; border-bottom: 1px solid var(--border); }
.title-block h1 { font-size: 1.7rem; }
.title-block table.tb-meta {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.76rem;
}
.title-block table.tb-meta td {
  padding: 9px 16px;
  border-right: 1px solid var(--border);
  color: var(--ink-dim);
}
.title-block table.tb-meta td:last-child { border-right: none; }
.title-block table.tb-meta span.k {
  display: block;
  color: var(--ink-faint);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 3px;
}
.title-block table.tb-meta span.v { color: var(--amber); }

/* ---------- Video player ---------- */
.video-frame {
  border: 1px solid var(--border);
  background: #000;
  margin-bottom: 32px;
}
.video-frame video { width: 100%; display: block; }

/* ---------- Prose ---------- */
.prose { max-width: 72ch; font-size: 1rem; }
.prose h2 { font-size: 1.3rem; margin-top: 1.6em; }
.prose h3 { font-size: 1.1rem; margin-top: 1.4em; }
.prose p { color: var(--ink); }
.prose a { text-decoration: underline; }
.prose code {
  font-family: var(--mono);
  background: rgba(150,198,236,0.12);
  padding: 2px 5px;
  font-size: 0.88em;
  color: var(--cyan);
}
.prose pre {
  background: var(--navy-mid);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  padding: 16px;
  overflow-x: auto;
}
.prose pre code { background: none; padding: 0; color: var(--ink); }

/* Syntax highlighting (highlight.js token classes), themed to match
   the blueprint palette rather than an imported color scheme. */
.prose pre.hljs { padding: 16px; }
.hljs-comment, .hljs-quote { color: var(--ink-faint); font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal, .hljs-built_in,
.hljs-type, .hljs-meta, .hljs-doctag { color: var(--amber); }
.hljs-string, .hljs-regexp, .hljs-addition { color: #9cd68c; }
.hljs-number, .hljs-symbol, .hljs-bullet { color: var(--cyan); }
.hljs-title, .hljs-title.function_, .hljs-section { color: var(--ink); font-weight: 600; }
.hljs-attr, .hljs-attribute, .hljs-variable, .hljs-template-variable { color: var(--cyan); }
.hljs-name, .hljs-tag { color: var(--amber); }
.hljs-deletion { color: var(--danger); }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 700; }

/* ---------- Share bar ---------- */
.share-bar {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin: 24px 0 0;
}
.share-bar .btn { gap: 8px; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose blockquote {
  border-left: 3px solid var(--cyan);
  margin: 1.2em 0;
  padding: 4px 0 4px 16px;
  color: var(--ink-dim);
}
.prose img { max-width: 100%; border: 1px solid var(--border); }

/* ---------- Empty states ---------- */
.empty-state {
  border: 1px dashed var(--border);
  padding: 48px 24px;
  text-align: center;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 0.9rem;
}

/* ---------- Buttons / forms ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 9px 16px;
  border: 1px solid var(--amber);
  color: var(--amber);
  background: transparent;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { background: var(--amber); color: var(--navy-deep); text-decoration: none; }
.btn.primary { background: var(--amber); color: var(--navy-deep); }
.btn.primary:hover { background: #ffbb5c; }
.btn.danger { border-color: var(--danger); color: var(--danger); }
.btn.danger:hover { background: var(--danger); color: #fff; }
.btn.ghost { border-color: var(--border); color: var(--ink-dim); }
.btn.ghost:hover { background: var(--grid-line-strong); color: var(--ink); }
.btn.small { padding: 5px 10px; font-size: 0.72rem; }

form.stack { display: flex; flex-direction: column; gap: 18px; max-width: 640px; }
.field label {
  display: block;
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  margin-bottom: 6px;
}
.field .hint { color: var(--ink-faint); font-size: 0.75rem; margin-top: 5px; font-family: var(--sans); }
.field input[type=text],
.field input[type=email],
.field input[type=password],
.field input[type=number],
.field textarea,
.field select {
  width: 100%;
  background: var(--navy-mid);
  border: 1px solid var(--border);
  color: var(--ink);
  padding: 10px 12px;
  font-family: var(--sans);
  font-size: 0.92rem;
}
.field textarea { font-family: var(--mono); resize: vertical; }
.field input[type=file] { color: var(--ink-dim); font-size: 0.85rem; }
.field input:focus, .field textarea:focus, .field select:focus { outline: 2px solid var(--amber); outline-offset: 1px; }
.error-banner {
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 0.85rem;
}
.form-actions { display: flex; gap: 10px; }

/* ---------- Admin ---------- */
.admin-shell { min-height: 60vh; }
.admin-topbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid var(--border);
}
table.data-table { width: 100%; border-collapse: collapse; margin-bottom: 40px; }
table.data-table th {
  text-align: left; font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase;
  color: var(--ink-faint); letter-spacing: 0.06em; padding: 10px 12px; border-bottom: 1px solid var(--border);
}
table.data-table td { padding: 12px; border-bottom: 1px solid var(--grid-line-strong); font-size: 0.88rem; vertical-align: middle; }
table.data-table tr:hover td { background: rgba(150,198,236,0.04); }
.status-pill {
  font-family: var(--mono); font-size: 0.68rem; padding: 2px 8px; border: 1px solid;
  text-transform: uppercase;
}
.status-pill.published { color: #7bd88f; border-color: #7bd88f; }
.status-pill.draft { color: var(--ink-dim); border-color: var(--border); }
.login-shell {
  max-width: 400px; margin: 80px auto; padding: 32px;
}

/* ---------- Category pill (distinct from tag chip) ---------- */
.category-pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--navy-deep);
  background: var(--amber);
  padding: 3px 9px;
  margin: 0 6px 6px 0;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.category-pill:hover { background: #ffbb5c; text-decoration: none; }
.category-pill.outline {
  background: transparent;
  color: var(--amber);
  border: 1px solid var(--amber);
}
.category-pill.outline.active { background: var(--amber); color: var(--navy-deep); }
.category-filter-bar { margin: 0 0 10px; display: flex; flex-wrap: wrap; }

.category-card {
  border: 1px solid var(--border);
  padding: 20px;
  background: rgba(19,47,79,0.35);
  transition: border-color 0.15s ease;
}
.category-card:hover { border-color: var(--amber-dim); }
.category-card h3 { margin-bottom: 6px; }
.category-card .count { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-dim); }

/* ---------- Comments ---------- */
.comments-section { margin-top: 56px; }
.comment-list { display: flex; flex-direction: column; gap: 16px; margin: 20px 0 32px; }
.comment {
  border: 1px solid var(--border);
  border-left: 3px solid var(--cyan);
  padding: 14px 18px;
  background: rgba(19,47,79,0.3);
}
.comment .comment-head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono); font-size: 0.75rem; color: var(--ink-faint); margin-bottom: 8px;
}
.comment .comment-author { color: var(--cyan); }
.comment .comment-body { white-space: pre-wrap; color: var(--ink); font-size: 0.92rem; line-height: 1.55; }
.comment-form { border: 1px solid var(--border); padding: 20px; background: rgba(19,47,79,0.25); }
.comment-form .row { display: flex; gap: 16px; flex-wrap: wrap; }
.comment-form .row .field { flex: 1; min-width: 200px; }
.hp-field { position: absolute; left: -9999px; opacity: 0; height: 0; width: 0; }
/* ---------- YouTube ticker marquee ---------- */
.marquee-bar {
  display: block;
  overflow: hidden;
  white-space: nowrap;
  background: linear-gradient(90deg, rgba(240,168,60,0.08), rgba(95,208,224,0.08));
  border-bottom: 1px solid var(--border);
  text-decoration: none;
}
.marquee-track {
  display: inline-flex;
  width: max-content;
}
.marquee-item {
  padding: 9px 48px 9px 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--amber);
  flex-shrink: 0;
}
.marquee-bar:hover .marquee-item { text-decoration: none; }
/* Second copy only exists for the seamless animated loop — without motion
   there's no point duplicating static text, so it's hidden by default.
   This is a pure CSS media-query gate, no JS needed. */
.marquee-dup { display: none; }

@media (prefers-reduced-motion: no-preference) {
  .marquee-dup { display: inline-flex; }
  .marquee-track {
    animation: marquee-scroll 22s linear infinite;
  }
  .marquee-bar:hover .marquee-track {
    animation-play-state: paused;
  }
}

@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 28px 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
}
.site-footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ============================================================
   MOTION — scroll-reveal + micro-interactions
   Progressive enhancement: content is fully visible with no JS
   and for anyone with prefers-reduced-motion set. Animation only
   kicks in when JS has run AND the user hasn't asked for less motion.
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
  html.js .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  }
  html.js .reveal.revealed {
    opacity: 1;
    transform: translateY(0);
  }
  /* Staggered children within a revealed grid */
  html.js .reveal .grid > * {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }
  html.js .reveal.revealed .grid > * { opacity: 1; transform: translateY(0); }
  html.js .reveal.revealed .grid > *:nth-child(2) { transition-delay: 0.06s; }
  html.js .reveal.revealed .grid > *:nth-child(3) { transition-delay: 0.12s; }
  html.js .reveal.revealed .grid > *:nth-child(4) { transition-delay: 0.18s; }
  html.js .reveal.revealed .grid > *:nth-child(n+5) { transition-delay: 0.22s; }

  @keyframes gridPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
  }
  body { animation: gridPulse 14s ease-in-out infinite; }
}

/* Richer hover states — layered on top of the base rules above */
.card {
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  box-shadow: 0 8px 28px -8px rgba(240, 168, 60, 0.25);
}
.btn {
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary:hover { box-shadow: 0 6px 18px -6px rgba(240, 168, 60, 0.5); }
.bracket-panel { transition: border-color 0.25s ease; }
.bracket-panel:hover { border-color: var(--amber-dim); }
.bracket-panel:hover::before, .bracket-panel:hover::after,
.bracket-panel:hover .bl, .bracket-panel:hover .br { opacity: 1; }
.tag-chip, .category-pill.outline {
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
.tag-chip:hover, .category-pill.outline:hover { transform: translateY(-1px); }
nav.main-nav a { transition: color 0.15s ease, background 0.15s ease; }

@media (max-width: 640px) {
  nav.main-nav a span.full { display: none; }
  .hero-stats { flex-wrap: wrap; }
  .search-form { display: none; }
}