:root {
  /* type + layout */
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --maxw: 860px;

  /* ---- palette: BURNT ORANGE (neon-red gas) ---- */
  --neon:      #ff5e3a;  --neon-rgb: 255,94,58;   /* primary */
  --neon-soft: #ff7a56;
  --cyan:      #5fe0ff;  --cyan-rgb: 95,224,255;  /* secondary */
  --amber:     #ffc98a;
  --pink:      #ff8fc4;  --pink-rgb: 255,143,196;
  --violet:    #c9b6ff;

  --bg: #0d0a12;
  --bg-grad-1: #17101d;
  --bg-grad-2: #0a0810;
  --surface: #161019;
  --surface-2: #1d1522;
  --border: #2c2333;
  --border-lit: #3a2c42;
  --ink: #f4ece6;
  --ink-dim: #b6a7b6;
  --ink-faint: #7d7086;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.68;
  letter-spacing: -0.003em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }
::selection { background: rgba(var(--neon-rgb), 0.32); color: #fff; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; width: 100%; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  display: inline-block;
}

/* ---------- nav ---------- */
nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(13,10,18,0.78);
  border-bottom: 1px solid var(--border);
}
.nav-in {
  max-width: var(--maxw); margin: 0 auto;
  padding: 16px 28px;
  display: flex; align-items: center; justify-content: space-between;
}
.mark {
  font-weight: 800; font-size: 21px; letter-spacing: -0.04em;
  color: #fff3ee;
  text-shadow: 0 0 6px rgba(var(--neon-rgb),0.55), 0 0 16px rgba(var(--neon-rgb),0.45);
  display: inline-flex; align-items: center; gap: 8px;
}
.mark b { color: var(--neon); font-weight: 800; }
.mark-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 8px var(--neon);
  display: inline-block;
  flex-shrink: 0;
}
.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a {
  font-family: var(--mono); font-size: 13.5px; color: var(--ink-dim);
  letter-spacing: 0.02em; transition: color .18s ease, text-shadow .18s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav-links a.active { color: var(--neon); border-bottom: 1px solid var(--neon); }
.nav-links a.gh:hover { color: var(--cyan); text-shadow: 0 0 12px rgba(var(--cyan-rgb),0.6); }

/* ---------- hero / header ---------- */
header.hero {
  position: relative;
  padding: 60px 0 44px;
  text-align: center;
  overflow: hidden;
}
.glow-field {
  position: absolute; inset: -20% -10% auto -10%;
  height: 540px; pointer-events: none; z-index: 0;
  background:
    radial-gradient(48% 55% at 50% 30%, rgba(var(--neon-rgb),0.22), transparent 70%),
    radial-gradient(38% 45% at 72% 42%, rgba(var(--cyan-rgb),0.12), transparent 70%),
    radial-gradient(40% 50% at 26% 46%, rgba(var(--pink-rgb),0.10), transparent 72%);
  filter: blur(8px);
}
header.hero .wrap { position: relative; z-index: 1; }

.wordmark {
  font-weight: 800;
  font-size: clamp(46px, 8.5vw, 84px);
  line-height: 0.95;
  letter-spacing: -0.055em;
  margin: 0;
  color: #fff5f0;
  text-shadow:
    0 0 6px rgba(255,255,255,0.55),
    0 0 20px var(--neon),
    0 0 44px var(--neon),
    0 0 80px rgba(var(--neon-rgb),0.75);
  animation: poweron 1.15s ease-out both;
}
.wordmark .flick { animation: flicker 5.2s linear 1.1s infinite; }

@keyframes flicker {
  0%, 96%, 100% { opacity: 1; }
  96.4% { opacity: 0.35; }
  96.8% { opacity: 1; }
  97.4% { opacity: 0.2; }
  97.9% { opacity: 1; }
}
@keyframes poweron {
  0%   { opacity: 0; text-shadow: none; color: #4a3a36; }
  18%  { opacity: 1; text-shadow: none; color: #4a3a36; }
  24%  { text-shadow: 0 0 8px var(--neon); color: #fff5f0; }
  30%  { text-shadow: none; color: #4a3a36; }
  46%  { text-shadow: 0 0 20px var(--neon), 0 0 44px var(--neon); color: #fff5f0; }
  52%  { text-shadow: 0 0 6px rgba(var(--neon-rgb),0.4); color: #9a7d76; }
  100% {
    opacity: 1;
    text-shadow: 0 0 6px rgba(255,255,255,0.55), 0 0 20px var(--neon), 0 0 44px var(--neon), 0 0 80px rgba(var(--neon-rgb),0.75);
    color: #fff5f0;
  }
}

.hero-tag {
  margin: 18px auto 0; max-width: 660px;
  font-size: clamp(20px, 2.6vw, 26px); font-weight: 700;
  letter-spacing: -0.03em; line-height: 1.25; color: var(--ink);
}
.hero-tag .glowc { color: var(--neon); text-shadow: 0 0 24px rgba(var(--neon-rgb),0.55); }

.lede {
  max-width: 580px; margin: 12px auto 0;
  font-size: 16px; line-height: 1.55; color: var(--ink-dim);
}

/* ---------- content & articles ---------- */
main { flex: 1; padding: 48px 0 64px; }
.rule { border: 0; height: 1px; background: linear-gradient(90deg, transparent, var(--border), transparent); margin: 32px 0; }

.sec-title {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}
.sec-title h2 {
  font-size: 24px; font-weight: 750; letter-spacing: -0.025em;
  margin: 0; color: var(--ink);
}
.sec-title h2 .dot { color: var(--neon); }

/* ---------- post cards ---------- */
.posts-grid { display: flex; flex-direction: column; gap: 18px; }
.post-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 28px;
  background: linear-gradient(180deg, var(--surface), rgba(22,16,25,0.4));
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
  display: block;
}
.post-card:hover {
  border-color: var(--border-lit);
  border-left-color: var(--neon);
  transform: translateY(-2px);
  box-shadow: 0 18px 40px -20px rgba(var(--neon-rgb),0.35);
}
.post-meta {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 10px;
}
.post-date {
  font-family: var(--mono); font-size: 13px; color: var(--ink-faint);
}
.post-card h3 {
  margin: 0 0 8px; font-size: 20px; font-weight: 700;
  letter-spacing: -0.02em; color: #fff;
  transition: color .15s ease;
}
.post-card:hover h3 { color: var(--neon-soft); }
.post-desc {
  margin: 0 0 14px; color: var(--ink-dim); font-size: 15px; line-height: 1.55;
}
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 8px;
  transition: color .18s ease, border-color .18s ease, background .18s ease, box-shadow .18s ease;
}
.tag:hover {
  color: var(--neon);
  border-color: var(--neon);
  background: rgba(var(--neon-rgb), 0.09);
  box-shadow: 0 0 12px rgba(var(--neon-rgb), 0.28);
}
.tag.neon {
  color: var(--neon);
  background: rgba(var(--neon-rgb), 0.08);
  border-color: rgba(var(--neon-rgb), 0.25);
}
.tag.neon:hover {
  background: rgba(var(--neon-rgb), 0.18);
  border-color: var(--neon);
  box-shadow: 0 0 14px rgba(var(--neon-rgb), 0.4);
}

/* ---------- article prose ---------- */
article.post-single {
  max-width: 760px; margin: 0 auto;
}
.post-single-header {
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 28px;
}
.post-single-header h1 {
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin: 12px 0 16px;
  color: #fff;
}
.prose {
  font-size: 17.5px;
  line-height: 1.75;
  color: var(--ink);
}
.prose p { margin: 20px 0; }
.prose h2 {
  font-size: 26px; font-weight: 750; letter-spacing: -0.025em;
  margin: 44px 0 16px; color: #fff;
  border-left: 3px solid var(--neon);
  padding-left: 14px;
}
.prose h3 {
  font-size: 21px; font-weight: 700; letter-spacing: -0.02em;
  margin: 32px 0 14px; color: var(--ink);
}
.prose a {
  color: var(--cyan);
  border-bottom: 1px dotted var(--cyan);
  transition: text-shadow .15s ease;
}
.prose a:hover {
  color: #fff;
  text-shadow: 0 0 12px rgba(var(--cyan-rgb),0.65);
}
.prose ul, .prose ol { padding-left: 24px; margin: 20px 0; }
.prose li { margin: 8px 0; }
.prose blockquote {
  margin: 28px 0;
  padding: 18px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: 8px;
  color: var(--ink-dim);
  font-style: normal;
}
.prose hr {
  border: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 40px 0;
}

/* inline code */
.prose code:not(pre code) {
  font-family: var(--mono);
  font-size: 0.88em;
  color: var(--amber);
  background: rgba(255,201,138,0.08);
  border: 1px solid rgba(255,201,138,0.18);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ---------- code editor block (neon-tube aesthetic) ---------- */
.editor {
  border: 1px solid var(--border-lit);
  border-radius: 14px;
  overflow: hidden;
  background: #0f0b13;
  box-shadow: 0 35px 80px -40px rgba(0, 0, 0, 0.95), 0 0 0 1px rgba(var(--neon-rgb), 0.08);
  margin: 28px 0;
}
.editor .editor-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  user-select: none;
}
.editor .dots {
  display: flex;
  gap: 7px;
  padding: 0 16px;
  flex: 0 0 auto;
}
.editor .dots i {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: block;
}
.editor .dots i:nth-child(1) { background: #ff5f57; }
.editor .dots i:nth-child(2) { background: #febc2e; }
.editor .dots i:nth-child(3) { background: #28c840; }

.editor .tab-title {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  padding: 12px 18px;
  border-bottom: 2px solid var(--neon);
  margin-bottom: -1px;
  margin-right: auto;
  letter-spacing: 0.04em;
  text-transform: lowercase;
}

.editor .copy-btn {
  border: 0;
  border-left: 1px solid var(--border);
  background: transparent;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 12px 18px;
  cursor: pointer;
  transition: color .16s ease, background .16s ease;
}
.editor .copy-btn:hover {
  color: var(--cyan);
  background: rgba(var(--cyan-rgb), 0.08);
}
.editor .copy-btn.copied {
  color: var(--neon);
  text-shadow: 0 0 10px rgba(var(--neon-rgb), 0.6);
}

.editor pre, pre {
  margin: 0 !important;
  border: 0 !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  background: #0f0b13 !important;
  padding: 22px 26px !important;
  font-family: var(--mono);
  font-size: 14.5px;
  line-height: 1.72;
  overflow-x: auto;
}
pre code {
  font-family: inherit;
  font-size: inherit;
  background: transparent !important;
  padding: 0;
}

/* Syntax token colors matching neon-tube palette */
.editor .z-9, .editor [class*="keyword"], .editor [class*="storage"] { color: var(--neon) !important; }
.editor .z-7, .editor [class*="string"] { color: var(--amber) !important; }
.editor .z-2, .editor [class*="function"], .editor [class*="entity-name-function"] { color: var(--violet) !important; }
.editor .z-8, .editor .z-1, .editor [class*="type"], .editor [class*="entity-name-type"] { color: var(--cyan) !important; }
.editor .z-6, .editor .z-11, .editor [class*="number"], .editor [class*="constant-numeric"] { color: var(--pink) !important; }
.editor .z-3, .editor [class*="comment"] { color: var(--ink-faint) !important; font-style: italic; }
.editor .z-4, .editor .z-5, .editor [class*="punctuation"], .editor [class*="operator"] { color: var(--ink-dim) !important; }

/* ---------- back link ---------- */
.back-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 13px; color: var(--ink-dim);
  margin-bottom: 24px;
  transition: color .15s ease;
}
.back-link:hover { color: var(--neon); }

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 44px 0 54px;
  margin-top: auto;
}
.foot-in {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 20px;
}
.foot-mark {
  font-weight: 800; font-size: 19px; letter-spacing: -0.04em;
  color: #fff3ee; text-shadow: 0 0 8px rgba(var(--neon-rgb),0.5);
}
.colophon { font-family: var(--mono); font-size: 12.5px; color: var(--ink-faint); }
.colophon a:hover { color: var(--cyan); }

@media (max-width: 640px) {
  .nav-links a.ext { display: none; }
  .post-card { padding: 20px; }
  body { font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .wordmark, .wordmark .flick { animation: none !important; }
}