/* ==========================================================================
   ClevCode — design system
   Dark-first, editorial-technical. Monospace for signal (meta, code, brand),
   a humanist sans for long-form reading. One warm accent (amber) against a
   deep blue-black, with a cool cyan as a secondary signal.
   ========================================================================== */

:root {
  --font-sans: "Raleway", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Menlo", "Consolas", monospace;

  --maxw: 46rem;      /* prose measure */
  --maxw-wide: 72rem; /* page frame */
  --gutter: clamp(1.25rem, 5vw, 2.5rem);

  --step--1: clamp(0.83rem, 0.79rem + 0.18vw, 0.92rem);
  --step-0: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --step-1: clamp(1.2rem, 1.12rem + 0.4vw, 1.4rem);
  --step-2: clamp(1.44rem, 1.3rem + 0.7vw, 1.85rem);
  --step-3: clamp(1.73rem, 1.5rem + 1.15vw, 2.5rem);
  --step-4: clamp(2.07rem, 1.7rem + 1.85vw, 3.3rem);
  --step-5: clamp(2.49rem, 1.9rem + 2.95vw, 4.2rem);

  --radius: 12px;
  --radius-sm: 8px;
  --ring: 0 0 0 3px color-mix(in oklab, var(--accent) 35%, transparent);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px -12px rgba(0, 0, 0, 0.55);
  --transition: 160ms cubic-bezier(0.2, 0, 0, 1);
}

/* ---- Dark theme (default) ---- */
:root,
html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0a0d13;
  --bg-elev: #10141c;
  --bg-elev-2: #161c26;
  --bg-code: #151b26;
  --fg: #d7dde7;
  --fg-strong: #f2f5fa;
  --muted: #8a94a6;
  --faint: #5c6675;
  --border: #1e2634;
  --border-strong: #2b3547;
  --accent: #e6b450;         /* amber */
  --accent-fg: #0a0d13;
  --accent-2: #57c7d4;       /* cyan */
  --prompt-user: #7ee787;    /* shell prompt: user@host (terminal green) */
  --prompt-path: #79c0ff;    /* shell prompt: path (terminal blue) */
  --link: #f0c674;
  --link-hover: #ffd98a;
  --selection: color-mix(in oklab, var(--accent) 30%, transparent);
  --scrollbar: rgba(255, 255, 255, 0.17);
  --scrollbar-hover: rgba(255, 255, 255, 0.32);
  --code-shadow: 0 2px 14px -8px rgba(0, 0, 0, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

/* ---- Light theme ---- */
html[data-theme="light"] {
  color-scheme: light;
  --bg: #fbfaf7;
  --bg-elev: #ffffff;
  --bg-elev-2: #f3f1ea;
  --bg-code: #f1eee4;
  --fg: #2b3037;
  --fg-strong: #14181d;
  --muted: #5c6675;
  --faint: #8a94a6;
  --border: #e6e2d8;
  --border-strong: #d6d0c2;
  --accent: #b6801a;
  --accent-fg: #ffffff;
  --accent-2: #1f7f8c;
  --prompt-user: #1a7f37;    /* shell prompt: user@host (terminal green) */
  --prompt-path: #0969da;    /* shell prompt: path (terminal blue) */
  --link: #a9741a;
  --link-hover: #82590f;
  --selection: color-mix(in oklab, var(--accent) 22%, transparent);
  --scrollbar: rgba(0, 0, 0, 0.20);
  --scrollbar-hover: rgba(0, 0, 0, 0.36);
  --code-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  font-feature-settings: "kern", "liga", "calt";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* subtle grid texture behind everything */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1200px 600px at 50% -10%, color-mix(in oklab, var(--accent) 7%, transparent), transparent 70%),
    linear-gradient(var(--border) 1px, transparent 1px) 0 0 / 100% 3.25rem,
    linear-gradient(90deg, var(--border) 1px, transparent 1px) 0 0 / 3.25rem 100%;
  opacity: 0.35;
  mask-image: linear-gradient(180deg, #000 0, transparent 90%);
}

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

/* ---- Discrete scrollbars ---- */
html {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar) transparent;
}
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar);
  border-radius: 999px;
  border: 3px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-hover);
}
::-webkit-scrollbar-corner {
  background: transparent;
}
::-webkit-scrollbar-button {
  display: none;
  width: 0;
  height: 0;
}

a {
  color: var(--link);
  text-decoration: none;
  text-underline-offset: 0.18em;
  text-decoration-thickness: from-font;
  transition: color var(--transition);
}
a:hover { color: var(--link-hover); text-decoration: underline; }

:focus-visible {
  outline: none;
  box-shadow: var(--ring);
  border-radius: 4px;
}

img,
video,
iframe { max-width: 100%; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 100;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ==========================================================================
   Layout frame
   ========================================================================== */
main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--maxw-wide);
  margin-inline: auto;
  padding: clamp(2rem, 5vw, 4rem) var(--gutter) 5rem;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin: 0 0 1rem;
}

/* ==========================================================================
   Soft navigation (client-side page swaps)
   ========================================================================== */
.nav-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: var(--accent);
  opacity: 0;
  pointer-events: none;
}
.nav-progress.active {
  opacity: 1;
  transform: scaleX(0.8);
  transition: transform 2.2s cubic-bezier(0.1, 0.75, 0.25, 1);
}
.nav-progress.done {
  opacity: 0;
  transform: scaleX(1);
  transition: transform 0.15s ease-out, opacity 0.25s ease 0.1s;
}

/* Cross-fade between pages via the View Transitions API (JS skips this when
   the user prefers reduced motion). */
@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation-duration: 0.18s;
  }
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--bg) 82%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.bar {
  max-width: var(--maxw-wide);
  margin-inline: auto;
  padding: 0.85rem var(--gutter);
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--fg-strong);
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--fg-strong); text-decoration: none; }
.brand-mark {
  color: var(--accent);
  background: color-mix(in oklab, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 35%, transparent);
  border-radius: 6px;
  padding: 0.1rem 0.4rem;
  line-height: 1;
}
.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
}
.site-nav a {
  color: var(--muted);
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.site-nav a:hover { color: var(--fg-strong); background: var(--bg-elev); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--accent); }
.nav-feed { color: var(--faint) !important; }

.theme-toggle {
  display: inline-grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--border-strong);
  background: var(--bg-elev);
  color: var(--fg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.1rem;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; }
/* show the current theme's icon: moon in dark, sun in light */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
html[data-theme="light"] .theme-toggle .icon-moon { display: none; }
html[data-theme="light"] .theme-toggle .icon-sun { display: block; }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 600;
  padding: 0.7rem 1.15rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { background: var(--link-hover); color: var(--accent-fg); }
.btn-ghost { border-color: var(--border-strong); color: var(--fg-strong); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ==========================================================================
   Hero / landing
   ========================================================================== */
.hero {
  display: flex;
  align-items: center;
  gap: clamp(2rem, 6vw, 4.5rem);
  padding: clamp(1rem, 4vw, 3rem) 0 clamp(2.5rem, 6vw, 4rem);
  border-bottom: 1px solid var(--border);
  margin-bottom: 3.5rem;
}
.hero-text { flex: 1 1 auto; min-width: 0; }
.hero-portrait {
  flex: 0 0 auto;
  border-radius: 50%;
  padding: 6px;
  background: conic-gradient(from 210deg, var(--accent-2), var(--accent) 55%, var(--accent-2));
  box-shadow: 0 0 44px -10px color-mix(in oklab, var(--accent-2) 45%, transparent);
}
.hero-portrait img {
  display: block;
  width: clamp(8.5rem, 15vw, 13rem);
  height: clamp(8.5rem, 15vw, 13rem);
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--bg);
  background: var(--bg-elev);
}
@media (max-width: 46rem) {
  .hero { flex-direction: column-reverse; align-items: flex-start; gap: 1.75rem; }
  .hero-portrait { align-self: center; }
}
.hero-title {
  font-size: var(--step-5);
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin: 0 0 1.25rem;
  color: var(--fg-strong);
  font-weight: 800;
}
.hero-lede {
  font-size: var(--step-1);
  color: var(--muted);
  max-width: 40rem;
  margin: 0 0 2rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.section-title {
  font-size: var(--step-2);
  letter-spacing: -0.02em;
  color: var(--fg-strong);
  margin: 0;
  font-weight: 700;
}
.section-link {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--muted);
  white-space: nowrap;
}
.section-link:hover { color: var(--accent); text-decoration: none; }

.home-latest,
.home-collections,
.home-more { margin-bottom: 4rem; }

/* ==========================================================================
   Post cards / grid
   ========================================================================== */
.post-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr));
  gap: 1.1rem;
}
.post-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--bg-elev), var(--bg));
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.post-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.card-link { display: block; padding: 1.3rem 1.35rem; height: 100%; color: inherit; }
.card-link:hover { text-decoration: none; }
.card-meta {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--faint);
  margin-bottom: 0.7rem;
}
.card-cat {
  color: var(--accent-2);
  border: 1px solid color-mix(in oklab, var(--accent-2) 30%, transparent);
  border-radius: 999px;
  padding: 0.05rem 0.55rem;
}
.card-title {
  font-size: var(--step-1);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 0.55rem;
  color: var(--fg-strong);
  font-weight: 650;
}
.post-card:hover .card-title { color: var(--accent); }
.card-excerpt {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0 0 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-more {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
}

/* ---- Collections ---- */
.collection-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 0.6rem;
}
.collection-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  color: var(--fg-strong);
  font-weight: 550;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.collection-list a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.collection-go { color: var(--faint); }
.collection-list a:hover .collection-go { color: var(--accent); }

/* ==========================================================================
   Archive / list pages
   ========================================================================== */
.list-header {
  padding-bottom: 1.75rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}
.list-title {
  font-size: var(--step-4);
  letter-spacing: -0.03em;
  margin: 0 0 0.5rem;
  color: var(--fg-strong);
  font-weight: 800;
}
.list-sub { color: var(--muted); margin: 0; max-width: 42rem; }

.archive-year { margin-bottom: 2.5rem; }
.year-label {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  color: var(--faint);
  margin: 0 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px dashed var(--border);
}
.post-rows { list-style: none; margin: 0; padding: 0; }
.post-row {
  display: grid;
  grid-template-columns: 6.5rem 1fr auto;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.post-row:hover { background: var(--bg-elev); }
.post-row time {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--faint);
  white-space: nowrap;
}
.post-row a { color: var(--fg-strong); font-weight: 550; }
.post-row:hover a { color: var(--accent); }
.row-cat {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-2);
  white-space: nowrap;
}
@media (max-width: 34rem) {
  .post-row { grid-template-columns: 1fr; gap: 0.15rem; }
  .row-cat { display: none; }
}

.back-link { font-family: var(--font-mono); font-size: var(--step--1); margin-top: 2.5rem; }

/* ==========================================================================
   Article / page
   ========================================================================== */
.post,
.page { max-width: var(--maxw); margin-inline: auto; }
.post-header,
.page-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}
.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--faint);
  margin-bottom: 1rem;
}
.post-meta .dot { color: var(--border-strong); }
.post-title,
.page-title {
  font-size: var(--step-4);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 0;
  color: var(--fg-strong);
  font-weight: 800;
}
.post-dek,
.page-dek {
  font-size: var(--step-1);
  color: var(--muted);
  margin: 1rem 0 0;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-2);
  padding: 0.1rem 0.5rem;
  border: 1px solid color-mix(in oklab, var(--accent-2) 28%, transparent);
  border-radius: 999px;
}
.tag:hover { color: var(--bg); background: var(--accent-2); text-decoration: none; }

.post-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 2.5rem; }

/* ---- prev / next ---- */
.post-nav {
  max-width: var(--maxw);
  margin: 3.5rem auto 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.pn {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  transition: border-color var(--transition);
}
.pn:hover { border-color: var(--accent); text-decoration: none; }
.pn-next { text-align: right; }
.pn-label { font-family: var(--font-mono); font-size: 0.78rem; color: var(--faint); }
.pn-title { color: var(--fg-strong); font-weight: 550; }
.pn:hover .pn-title { color: var(--accent); }
@media (max-width: 34rem) { .post-nav { grid-template-columns: 1fr; } .pn-next { text-align: left; } }

/* ==========================================================================
   Prose
   ========================================================================== */
.prose {
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--fg);
}
.prose > * { margin-block: 0; }
.prose > * + * { margin-top: 1.4em; }
.prose h2,
.prose h3,
.prose h4 {
  color: var(--fg-strong);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-top: 2.4em;
  margin-bottom: 0.2em;
  scroll-margin-top: 5rem;
}
.prose h2 { font-size: var(--step-2); font-weight: 700; }
.prose h3 { font-size: var(--step-1); font-weight: 650; }
.prose h4 { font-size: var(--step-0); font-weight: 650; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
.prose h2 + *, .prose h3 + * { margin-top: 0.6em; }

.prose a { color: var(--link); text-decoration: underline; text-decoration-color: color-mix(in oklab, var(--link) 40%, transparent); }
.prose a:hover { text-decoration-color: currentColor; }

.prose strong { color: var(--fg-strong); font-weight: 650; }
.prose ul, .prose ol { margin: 0; padding-left: 1.4em; }
.prose li { margin-top: 0.4em; }
.prose li::marker { color: var(--accent); }

.prose blockquote {
  margin: 0;
  padding: 0.4em 1.3em;
  border-left: 3px solid var(--accent);
  color: var(--muted);
  font-style: italic;
  background: color-mix(in oklab, var(--accent) 5%, transparent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.prose blockquote p { margin-top: 0.6em; }

.prose img {
  display: block;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  margin-inline: auto;
}
.prose hr { border: none; border-top: 1px solid var(--border); margin: 2.5em 0; }
.prose .caption,
.prose figcaption {
  display: block;
  text-align: center;
  font-size: var(--step--1);
  color: var(--faint);
  margin-top: 0.6em;
}
.prose .center { text-align: center; }

/* inline code */
.prose :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.1em 0.38em;
  color: var(--fg-strong);
  word-break: break-word;
}

/* video / embeds */
.embed {
  position: relative;
  padding-top: 56.25%;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #000;
}
.embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.prose video {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #000;
}

.prose-tight { font-size: 0.98rem; }
.prose-tight > * + * { margin-top: 1em; }

/* Cicada 3301 mark — recolored per theme via an alpha mask */
.cicada-mark {
  display: block;
  width: min(320px, 62%);
  aspect-ratio: 542 / 192;
  margin: 1.5rem auto 0.5rem;
  background-color: var(--fg-strong);
  -webkit-mask: url(/files/cicada3301-mask.png) center / contain no-repeat;
  mask: url(/files/cicada3301-mask.png) center / contain no-repeat;
  opacity: 0.92;
}

/* ==========================================================================
   Code blocks (Chroma classes themed in highlight.css)
   ========================================================================== */
.code-wrap { position: relative; }
.prose pre.chroma,
.prose pre {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.6;
  background: var(--bg-code);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  box-shadow: var(--code-shadow);
  padding: 1.1rem 1.2rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  tab-size: 4;
}
.prose pre code { font-family: inherit; font-size: inherit; background: none; border: none; padding: 0; color: inherit; }

.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.3rem 0.6rem;
  color: var(--muted);
  background: color-mix(in oklab, var(--bg-elev) 85%, transparent);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition), color var(--transition), border-color var(--transition);
}
.code-wrap:hover .copy-btn,
.copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.copy-btn.copied { color: var(--accent-2); border-color: var(--accent-2); }

/* Custom code-block scrollbar (thin pill, no arrows, animated hover). Native is
   hidden only once JS has wrapped the block, so no-JS users keep a real one. */
.code-wrap pre.chroma { scrollbar-width: none; }
.code-wrap pre.chroma::-webkit-scrollbar { display: none; width: 0; height: 0; }
.cw-scrollbar {
  position: absolute;
  left: 4px;
  right: 4px;
  bottom: 4px;
  height: 12px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.22s ease;
}
.code-wrap.has-scroll .cw-scrollbar { opacity: 1; pointer-events: auto; }
.cw-thumb {
  position: absolute;
  left: 0;
  top: 4px;
  height: 4px;
  min-width: 28px;
  border-radius: 999px;
  background: var(--scrollbar);
  cursor: grab;
  transition: background 0.2s ease, height 0.16s ease, top 0.16s ease;
}
/* nearing the pill (anywhere in the bottom strip) or dragging it smoothly
   brightens and grows it */
.cw-scrollbar:hover .cw-thumb,
.cw-thumb:active {
  background: var(--scrollbar-hover);
  height: 6px;
  top: 3px;
}
.cw-thumb:active { cursor: grabbing; }

/* ==========================================================================
   Comments
   ========================================================================== */
.comments {
  max-width: var(--maxw);
  margin: 4rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.comments-head { font-size: var(--step-2); color: var(--fg-strong); margin: 0 0 0.3rem; }
.comments-note { font-family: var(--font-mono); font-size: var(--step--1); color: var(--faint); margin: 0 0 2rem; }
.comment-list { list-style: none; margin: 0; padding: 0; }
.comment {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 0.9rem;
  padding: 1.1rem 0;
  border-top: 1px solid var(--border);
}
.comment.depth-0:first-child { border-top: none; }
.comment.depth-1 { margin-left: 1.5rem; }
.comment.depth-2 { margin-left: 3rem; }
.comment.depth-3, .comment.depth-4 { margin-left: 4.5rem; }
.comment-avatar img { border-radius: 50%; border: 1px solid var(--border); display: block; background: var(--bg-elev); }
.comment-meta { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.6rem; margin-bottom: 0.35rem; }
.comment-author { color: var(--fg-strong); font-weight: 600; }
.comment-meta time { font-family: var(--font-mono); font-size: 0.76rem; color: var(--faint); }
.comment-text { color: var(--fg); white-space: pre-line; word-wrap: break-word; }
.comment-text { font-size: 0.96rem; }
@media (max-width: 34rem) {
  .comment.depth-1, .comment.depth-2, .comment.depth-3, .comment.depth-4 { margin-left: 0.8rem; }
}

/* ==========================================================================
   Forms (comments + contact)
   ========================================================================== */
.comments-empty { color: var(--muted); font-family: var(--font-mono); font-size: var(--step--1); margin: 0 0 2rem; }
.comment-reply-link {
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--muted);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}
.comment-reply-link:hover { color: var(--accent); }

.cform-wrap {
  max-width: var(--maxw);
  margin: 2.5rem auto 0;
  padding: 1.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}
.contact-form-wrap { margin-top: 2rem; }
.cform-title { font-size: var(--step-1); color: var(--fg-strong); margin: 0 0 1rem; }
.cform-replyto {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--muted);
  margin: 0 0 1rem;
}
.cform-cancel {
  background: none; border: none; color: var(--accent-2); cursor: pointer;
  font: inherit; padding: 0; text-decoration: underline;
}
.cform { display: flex; flex-direction: column; gap: 1rem; }
.cform-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 34rem) { .cform-row { grid-template-columns: 1fr; } }
.cform-label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.cform-lt { display: flex; align-items: baseline; gap: 0.5rem; flex-wrap: wrap; min-height: 1.2em; }
.cform-opt { color: var(--faint); font-weight: 400; text-transform: none; }
.cform input,
.cform textarea {
  font-family: var(--font-sans);
  font-size: var(--step-0);
  color: var(--fg-strong);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.75rem;
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.cform textarea { resize: vertical; line-height: 1.6; min-height: 6rem; }
.cform input:focus,
.cform textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 22%, transparent);
}
.cform-actions { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.cform-note { font-family: var(--font-mono); font-size: 0.74rem; color: var(--faint); }
.cform button[type="submit"] { border: none; }

/* honeypot — visually hidden, off-screen, but not display:none (bots skip those) */
.hp-field {
  position: absolute !important;
  left: -9999px !important;
  width: 1px; height: 1px; overflow: hidden;
}

.form-flash {
  padding: 0.8rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  margin: 0 0 1.25rem;
  border: 1px solid transparent;
}
.form-flash.flash-ok {
  color: var(--accent-2);
  background: color-mix(in oklab, var(--accent-2) 12%, transparent);
  border-color: color-mix(in oklab, var(--accent-2) 35%, transparent);
}
.form-flash.flash-err {
  color: #ff8f8f;
  background: color-mix(in oklab, #ff6b6b 12%, transparent);
  border-color: color-mix(in oklab, #ff6b6b 35%, transparent);
}

/* ==========================================================================
   404
   ========================================================================== */
.notfound { text-align: center; max-width: 36rem; margin: 4rem auto; }
.nf-code {
  font-family: var(--font-mono);
  font-size: var(--step-5);
  color: var(--accent);
  margin: 0;
  line-height: 1;
  font-weight: 800;
}
.nf-title { font-size: var(--step-3); color: var(--fg-strong); margin: 0.5rem 0 1rem; }
.nf-text { color: var(--muted); margin: 0 0 2rem; }
.notfound .hero-actions { justify-content: center; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  margin-top: auto;
}
.foot-grid {
  max-width: var(--maxw-wide);
  margin-inline: auto;
  padding: 3rem var(--gutter);
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 2rem;
}
.foot-brand p { color: var(--muted); font-size: 0.92rem; margin: 0.9rem 0 0; max-width: 22rem; }
.foot-copy { font-family: var(--font-mono); font-size: 0.78rem; color: var(--faint) !important; }
.foot-col h2 {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--faint);
  margin: 0 0 0.9rem;
}
.foot-col a { display: block; color: var(--muted); font-size: 0.92rem; padding: 0.22rem 0; }
.foot-col a:hover { color: var(--accent); text-decoration: none; }
@media (max-width: 48rem) {
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .foot-brand { grid-column: 1 / -1; }
}
@media (max-width: 30rem) { .foot-grid { grid-template-columns: 1fr; } }