/* ==========================================================================
   DrkPxl — "Editorial reading-room"
   Mobile-first. Brand tokens preserved from the Bearblog era; the refresh is
   structural/typographic. Gradient is used sparingly (scarcity = signal).
   ========================================================================== */

:root {
  /* Layout */
  --width: 900px;
  --measure: 68ch; /* reading measure for prose */
  --font-main: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Monaco", "Courier New", monospace;

  /* Dark theme colors */
  --background-color: #222;
  --background-secondary: #0a0a0a;
  --background-card: #111111;
  --background-hover: #1a1a1a;

  /* Text colors */
  --heading-color: #f9fafb;
  --text-color: #e5e7eb;
  --text-secondary: #9ca3af;

  /* Accent colors */
  --link-color: #60a5fa;
  --visited-color: #818cf8;
  --main-color: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);

  /* Code and borders */
  --code-background-color: #0a0a0a;
  --code-color: #e5e7eb;
  --border-color: #27272a;
  --border-accent: #3b82f6;

  /* Spacing scale (8px-ish rhythm) */
  --s-1: 0.5rem;
  --s-2: 1rem;
  --s-3: 1.5rem;
  --s-4: 2.5rem;
  --s-5: 4rem;
  --s-6: 6rem;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  margin: auto;
  max-width: var(--width);
  padding: 1.25rem;
  word-wrap: break-word;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Links (base) */
a {
  color: var(--link-color);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}
a:hover {
  color: var(--main-color);
}

:focus-visible {
  outline: 2px solid var(--link-color);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection {
  background: var(--link-color);
  color: var(--background-color);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--main-color);
  color: #fff;
  padding: 0.5rem 0.9rem;
  border-radius: 0 0 6px 0;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

/* --------------------------------------------------------------------------
   Header / wordmark / nav
   -------------------------------------------------------------------------- */
.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.4rem 1rem;
  padding-bottom: 1.1rem;
  margin-bottom: var(--s-4);
  border-bottom: 1px solid var(--border-color);
  position: relative;
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 64px;
  height: 1px;
  background: var(--accent-gradient);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.01em;
}
.wordmark__panda {
  font-size: 1.15rem;
}
.wordmark__text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
}
.site-nav a {
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  padding: 0.2rem 0;
}
.site-nav a:hover {
  color: var(--link-color);
}
.site-nav a[aria-current="page"] {
  color: var(--heading-color);
}
.site-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--accent-gradient);
}

/* --------------------------------------------------------------------------
   Hero / page heads
   -------------------------------------------------------------------------- */
main {
  animation: fadeIn 0.3s ease-out;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.hero,
.page-head {
  margin: var(--s-2) 0 0;
}

.display {
  margin: 0;
  font-size: clamp(2rem, 7vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--heading-color);
  text-wrap: balance;
}

.deck {
  margin: 0.9rem 0 0;
  max-width: 48ch;
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--text-secondary);
  text-wrap: pretty;
}

.kicker {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
}
.kicker a {
  color: var(--link-color);
}

/* The one earned gradient hairline per region */
.rule {
  width: 64px;
  height: 3px;
  margin: var(--s-3) 0 0;
  background: var(--accent-gradient);
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   Section labels + month dividers
   -------------------------------------------------------------------------- */
.section-label {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.index-section {
  margin-top: var(--s-5);
}

.month-divider {
  margin: var(--s-3) 0 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  opacity: 0.7;
}
.index-group:first-of-type .month-divider {
  margin-top: 0;
}

/* --------------------------------------------------------------------------
   Index rows (homepage / blog / tags / keep-reading)
   -------------------------------------------------------------------------- */
.index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.index-row {
  position: relative;
  border-bottom: 1px solid var(--border-color);
}
.index-row::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0;
  background: var(--accent-gradient);
  transition: width 0.25s ease;
}
.index-row:hover::after,
.index-row:focus-within::after {
  width: 100%;
}

.index-row__link {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  gap: 0.3rem 0.85rem;
  padding: 1.1rem 0.1rem;
}
.index-row__date {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
}
.index-row__body {
  grid-column: 1;
  grid-row: 2;
}
.index-row__title {
  display: block;
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--heading-color);
  text-wrap: pretty;
  transition: color 0.2s ease;
}
.index-row__desc {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-secondary);
  text-wrap: pretty;
}
.index-row__arrow {
  grid-column: 2;
  grid-row: 1 / 3;
  align-self: center;
  color: var(--text-secondary);
  transition: transform 0.2s ease, color 0.2s ease;
}
.index-row:hover .index-row__title {
  color: var(--link-color);
}
.index-row:hover .index-row__arrow {
  transform: translateX(4px);
  color: var(--link-color);
}
.index-row .ext {
  color: var(--text-secondary);
  font-size: 0.85em;
}

.all-posts {
  margin-top: var(--s-3);
}
.all-posts a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.all-posts a:hover {
  color: var(--link-color);
}

/* --------------------------------------------------------------------------
   Meta strip (Reference + Topics + last updated)
   -------------------------------------------------------------------------- */
.meta-strip {
  margin-top: var(--s-5);
  padding-top: var(--s-3);
  border-top: 1px solid var(--border-color);
  display: grid;
  gap: var(--s-4);
}

.reference-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.reference-list li {
  margin-bottom: 0.45rem;
}
.reference-list a {
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
  font-weight: 500;
  padding-bottom: 1px;
}
.reference-list a:hover {
  color: var(--link-color);
  border-bottom-color: var(--link-color);
}

.topic-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  margin: 0;
}
.chip {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.chip:hover {
  color: var(--link-color);
}

.last-updated {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  opacity: 0.6;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: var(--s-6);
  padding-top: var(--s-3);
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.85rem;
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 64px;
  height: 1px;
  background: var(--accent-gradient);
}
.site-footer p {
  margin: 0;
}
.site-footer a {
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}
.site-footer a:hover {
  color: var(--link-color);
  border-bottom-color: var(--link-color);
}

/* --------------------------------------------------------------------------
   Article header
   -------------------------------------------------------------------------- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: var(--accent-gradient);
  z-index: 60;
}
@supports (animation-timeline: scroll()) {
  .reading-progress {
    animation: grow auto linear;
    animation-timeline: scroll(root block);
  }
}
@keyframes grow {
  to {
    transform: scaleX(1);
  }
}

.post-header {
  margin-top: var(--s-2);
}
.post-title {
  margin: 0.4rem 0 0;
  font-size: clamp(2rem, 6vw, 3.1rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--heading-color);
  text-wrap: balance;
}
.post-deck {
  margin: 0.9rem 0 0;
  max-width: 60ch;
  font-size: 1.2rem;
  line-height: 1.5;
  color: var(--text-secondary);
  text-wrap: pretty;
}
.post-meta {
  margin: 0.9rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.post-meta .dot {
  margin: 0 0.35rem;
  opacity: 0.6;
}

.external-note {
  max-width: var(--measure);
  margin: var(--s-4) 0 0;
  padding: 1rem 1.25rem;
  background: var(--background-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.keep-reading {
  margin-top: var(--s-5);
  padding-top: var(--s-3);
  border-top: 1px solid var(--border-color);
}

/* --------------------------------------------------------------------------
   Prose — narrow reading measure, with code/tables breaking out wider
   -------------------------------------------------------------------------- */
.post-body {
  margin-top: var(--s-4);
  font-size: 1.06rem;
  line-height: 1.75;
}

/* Constrain reading blocks to the measure; let pre/table span the full frame. */
.prose > p,
.prose > ul,
.prose > ol,
.prose > dl,
.prose > h2,
.prose > h3,
.prose > h4,
.prose > blockquote,
.prose > .callout,
.prose > figure,
.prose > hr {
  max-width: var(--measure);
  margin-left: 0;
  margin-right: auto;
}
.prose > :first-child {
  margin-top: 0;
}

.prose p {
  margin: 0 0 var(--s-3);
  text-wrap: pretty;
}
.prose h2 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--heading-color);
  margin-top: var(--s-4);
  margin-bottom: var(--s-1);
  text-wrap: balance;
}
.prose h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--heading-color);
  margin-top: var(--s-3);
  margin-bottom: var(--s-1);
}
.prose :is(h2, h3) a {
  color: inherit;
}

.prose strong {
  color: var(--heading-color);
  font-weight: 600;
}

.prose a {
  border-bottom: 1px solid rgba(96, 165, 250, 0.35);
}
.prose a:hover {
  border-bottom-color: var(--link-color);
}

.prose ul,
.prose ol {
  padding-left: 1.4rem;
}
.prose li {
  margin-bottom: 0.4rem;
}
.prose li::marker {
  color: var(--link-color);
}

/* Raised initial — articles only. No float, so it never overhangs short
   posts and always starts flush on the reading rail. */
.post .post-body > p:first-of-type::first-letter {
  font-weight: 800;
  font-size: 2.2em;
  line-height: 1;
  vertical-align: -0.12em;
  padding-right: 0.04em;
  letter-spacing: -0.01em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Inline + block code */
.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-background-color);
  color: var(--link-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.12rem 0.35rem;
}
.prose pre {
  position: relative;
  margin: var(--s-3) 0;
  padding: 1rem 1.25rem;
  background: var(--code-background-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
}
.prose pre::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent-gradient);
  border-radius: 8px 0 0 8px;
}
.prose pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--code-color);
  font-size: 1em;
}

/* Blockquote — gradient spine, no italic */
.prose blockquote {
  position: relative;
  margin: var(--s-3) auto;
  padding: 0.85rem 1.25rem;
  background: var(--background-card);
  border-radius: 0 8px 8px 0;
  color: var(--text-color);
  font-size: 1.2rem;
  font-weight: 500;
  font-style: normal;
  line-height: 1.55;
}
.prose blockquote::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent-gradient);
  border-radius: 3px;
}
.prose blockquote p:last-child {
  margin-bottom: 0;
}

/* Callouts (author opt-in via raw HTML) */
.callout {
  position: relative;
  margin: var(--s-3) auto;
  padding: 1rem 1.25rem;
  background: var(--background-card);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--main-color);
  border-radius: 0 8px 8px 0;
}
.callout__label {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.7rem;
  color: var(--text-secondary);
}
.callout > :last-child {
  margin-bottom: 0;
}
.callout--warn {
  border-left-color: #f59e0b;
}

/* Tables — responsive, can scroll horizontally */
.prose table {
  display: block;
  width: max-content;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: var(--s-3) 0;
  font-size: 0.95rem;
}
.prose th,
.prose td {
  border: 1px solid var(--border-color);
  padding: 0.6rem 0.85rem;
  text-align: left;
}
.prose th {
  background: var(--background-card);
  color: var(--heading-color);
  font-weight: 600;
}
.prose td {
  background: var(--background-secondary);
}
.prose tbody tr:hover td {
  background: var(--background-hover);
}

/* Images */
.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: var(--s-3) 0;
}

/* Horizontal rule → "* * *" */
.prose hr {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: var(--s-5) auto;
  position: relative;
}
.prose hr::after {
  content: "* * *";
  position: absolute;
  top: -0.7em;
  left: 50%;
  transform: translateX(-50%);
  background: var(--background-color);
  padding: 0 1rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   Desktop enhancements
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
  body {
    padding: 2rem 1.5rem;
  }

  .post-body {
    font-size: 1.125rem;
  }

  /* Index rows become a fixed mono date column + title */
  .index-row__link {
    grid-template-columns: 6rem 1fr auto;
    align-items: baseline;
    gap: 0.85rem;
    padding: 1.2rem 0.1rem;
  }
  .index-row__date {
    grid-column: 1;
    grid-row: 1;
  }
  .index-row__body {
    grid-column: 2;
    grid-row: 1;
  }
  .index-row__arrow {
    grid-column: 3;
    grid-row: 1;
    align-self: baseline;
  }

  .meta-strip {
    grid-template-columns: 1fr 1fr;
  }
  .meta-strip .last-updated {
    grid-column: 1 / -1;
  }
}

/* --------------------------------------------------------------------------
   Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  main {
    animation: none;
  }
  .reading-progress {
    display: none;
  }
}