/* ============================================================
   undefinedbehavior.co.uk — theme tokens
   Palette lifted from real compiler diagnostic colouring
   (gcc/clang: cyan=note, magenta/amber=warning, red=error)
   ============================================================ */
:root {
  --bg: #0a0e14;
  --bg-raised: #10151d;
  --bg-inset: #06080c;
  --border: #1e2630;
  --border-bright: #2a3441;

  --text: #c5ccd6;
  --text-dim: #5b6572;
  --text-bright: #eef1f6;

  --accent-note: #7aa2f7;
  --accent-warn: #e0af68;
  --accent-err: #f7768e;
  --accent-ok: #9ece6a;

  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;

  --radius: 3px;
  --wrap: 780px;
}

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a { color: var(--accent-note); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

:focus-visible {
  outline: 2px solid var(--accent-warn);
  outline-offset: 2px;
  border-radius: 2px;
}

/* subtle CRT scanline overlay — decorative, never blocks interaction */
.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.012) 0px,
    rgba(255, 255, 255, 0.012) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: overlay;
}

/* ---------------- header ---------------- */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-raised);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1.1rem 1.5rem;
}
.prompt-logo {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-bright);
  white-space: nowrap;
}
.prompt-logo:hover { text-decoration: none; }
.prompt-user { color: var(--accent-ok); }
.prompt-at, .prompt-colon { color: var(--text-dim); }
.prompt-host { color: var(--accent-note); }
.prompt-cursor {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  background: var(--accent-warn);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.site-nav {
  display: flex;
  gap: 1.4rem;
  flex-wrap: wrap;
  font-size: 0.88rem;
}
.site-nav a { color: var(--text); }
.site-nav a:hover { color: var(--accent-warn); text-decoration: none; }
.nav-cmd { color: var(--accent-note); }

/* ---------------- hero ---------------- */
.hero { padding: 3rem 0 2.5rem; }
.hero__terminal {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem;
  font-size: 0.86rem;
  line-height: 1.85;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}
.tok-prompt { color: var(--accent-ok); }
.tok-dim { color: var(--text-dim); }
.tok-note { color: var(--accent-note); }
.tok-warn { color: var(--accent-warn); }
.tok-err { color: var(--accent-err); }
.tok-comment { color: var(--text-dim); font-style: italic; }
.tok-kw { color: var(--accent-err); }
.tok-type { color: var(--accent-note); }
.tok-punct { color: var(--text-dim); }

/* one-shot glitch on the hero command — never loops */
.glitch-once {
  position: relative;
  display: inline-block;
  color: var(--text-bright);
  animation: settle 900ms ease-out 1;
}
.glitch-once::before,
.glitch-once::after {
  content: attr(data-text);
  position: absolute;
  left: 0; top: 0;
  overflow: hidden;
  opacity: 0;
}
@media (prefers-reduced-motion: no-preference) {
  .glitch-once::before {
    color: var(--accent-err);
    animation: glitch-a 900ms ease-out 1;
  }
  .glitch-once::after {
    color: var(--accent-note);
    animation: glitch-b 900ms ease-out 1;
  }
}
@keyframes settle {
  0% { filter: blur(1px); }
  15% { transform: translate(-1px, 0); }
  30% { transform: translate(1px, 0); }
  45% { transform: translate(0, 0); filter: blur(0); }
  100% { transform: translate(0, 0); }
}
@keyframes glitch-a {
  0% { opacity: 0.8; transform: translate(2px, 0); clip-path: inset(0 0 60% 0); }
  20% { opacity: 0.8; transform: translate(-2px, 0); clip-path: inset(40% 0 20% 0); }
  35% { opacity: 0; }
  100% { opacity: 0; }
}
@keyframes glitch-b {
  0% { opacity: 0.8; transform: translate(-2px, 0); clip-path: inset(50% 0 10% 0); }
  20% { opacity: 0.8; transform: translate(2px, 0); clip-path: inset(10% 0 60% 0); }
  35% { opacity: 0; }
  100% { opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .glitch-once { animation: none; }
}

/* ---------------- section heading ---------------- */
.section-heading {
  font-size: 1.05rem;
  color: var(--text-bright);
  margin: 0 0 1.25rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px dashed var(--border-bright);
}
.log-section { padding: 1.5rem 0 4rem; }
.list-intro { color: var(--text-dim); margin-bottom: 2rem; }

/* ---------------- diagnostic post cards ---------------- */
.diag-list { display: flex; flex-direction: column; gap: 1.75rem; }
.diag {
  border-left: 3px solid var(--border-bright);
  padding-left: 1rem;
}
.diag--warning { border-left-color: var(--accent-warn); }
.diag--note { border-left-color: var(--accent-note); }

.diag__head { font-size: 0.82rem; margin-bottom: 0.35rem; }
.diag--warning .diag__level { color: var(--accent-warn); font-weight: 700; }
.diag--note .diag__level { color: var(--accent-note); font-weight: 700; }
.diag__loc { color: var(--text-dim); }

.diag__body { display: flex; gap: 0.75rem; }
.diag__gutter { color: var(--text-dim); user-select: none; }
.diag__title { margin: 0.1rem 0; font-size: 1.15rem; }
.diag__title a { color: var(--text-bright); }
.diag__title a:hover { color: var(--accent-warn); }

.diag__body--text p { margin: 0.1rem 0; color: var(--text); }
.diag__note { display: flex; gap: 0.75rem; font-size: 0.85rem; color: var(--text-dim); margin-top: 0.4rem; }

.diag__includes {
  margin-top: 0.65rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.include-tag {
  font-size: 0.78rem;
  color: var(--accent-ok);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.15rem 0.5rem;
}
.include-tag:hover { border-color: var(--accent-ok); text-decoration: none; }
.include-tag--big { font-size: 0.95rem; padding: 0.4rem 0.75rem; }

.more-link {
  display: inline-block;
  margin-top: 2.5rem;
  color: var(--accent-warn);
}

.tag-cloud { display: flex; flex-wrap: wrap; gap: 0.75rem; }

/* ---------------- single post ---------------- */
.post { padding: 3rem 0 4rem; }
.post-header__struct {
  font-size: 0.85rem;
  color: var(--text-dim);
}
.post-header__struct--close { margin-top: 2.5rem; }
.tok-kw { color: var(--accent-err); }
.post-title {
  color: var(--text-bright);
  font-size: 1.8rem;
  margin: 0.4rem 0 1rem;
  line-height: 1.3;
}
.post-flags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-size: 0.78rem;
  color: var(--accent-note);
  margin-bottom: 1.25rem;
}
.flag {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.15rem 0.5rem;
}
.post-resources {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  margin-bottom: 2rem;
  font-size: 0.88rem;
}
.post-resources ul { margin: 0.4rem 0 0; padding-left: 1.2rem; }

.post-content { font-size: 1rem; }
.post-content h2, .post-content h3 {
  color: var(--text-bright);
  margin-top: 2.2rem;
}
.post-content p { color: var(--text); }
.post-content a { color: var(--accent-note); }
.post-content code {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 0.1rem 0.35rem;
  font-size: 0.9em;
  color: var(--accent-warn);
}
.post-content pre {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  overflow-x: auto;
}
.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
}
.post-content blockquote {
  border-left: 3px solid var(--accent-warn);
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1.1rem;
  color: var(--text-dim);
}
.post-content img { max-width: 100%; border-radius: var(--radius); }
.post-content hr { border: none; border-top: 1px dashed var(--border-bright); margin: 2.5rem 0; }

.post-tags { margin-top: 2.5rem; }

.post-pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}
.pager-link--next { margin-left: auto; text-align: right; }

/* ---------------- plain pages (About) ---------------- */
.page { padding: 3rem 0 4rem; }
.page__catline { color: var(--accent-ok); font-size: 0.85rem; margin-bottom: 0.5rem; }
.page-title { color: var(--text-bright); font-size: 1.7rem; margin: 0 0 1.5rem; }

/* ---------------- footer ---------------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-raised);
  margin-top: 2rem;
}
.site-footer__inner {
  padding: 2rem 1.5rem;
  font-size: 0.82rem;
  color: var(--text-dim);
}
.footer-line { margin-bottom: 0.75rem; }
.footer-links a { color: var(--text-dim); }
.footer-links a:hover { color: var(--accent-warn); }
.footer-links .sep { margin: 0 0.5rem; color: var(--border-bright); }
.footer-exit { margin-top: 0.9rem; color: var(--accent-ok); }

/* ---------------- responsive ---------------- */
@media (max-width: 640px) {
  .hero { padding: 2rem 0 1.5rem; }
  .hero__terminal { font-size: 0.76rem; padding: 1.1rem; }
  .site-header__inner { flex-direction: column; align-items: flex-start; }
  .diag__body { gap: 0.5rem; }
  .post-title { font-size: 1.5rem; }
}