/* ──────────────────────────────────────────────────────────────────
 *  CANVAS CODE // NIGHT CITY TERMINAL
 *  Pure mono. Phosphor green on near-black. Scanlines, CRT vignette,
 *  blinking cursor, ASCII box drawing. The page is a tty session.
 * ────────────────────────────────────────────────────────────────── */

:root {
  --bg:          #0a0a0d;
  --bg-panel:    #0e0e14;
  --bg-deep:     #07070a;
  --rule:        #1a1a22;
  --rule-hi:     #2c2c38;
  --ink:         #d8d8e0;
  --ink-dim:     #888a96;
  --ink-faint:   #4a4c56;
  --phosphor:    #00ff66;
  --phosphor-2:  #00b34a;
  --phosphor-glow: rgba(0, 255, 102, 0.45);
  --amber:       #ffb000;
  --magenta:     #ff2c70;
  --cyan:        #00e5ff;
  --max:         1140px;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scrollbar-color: var(--phosphor-2) var(--bg); }
html::-webkit-scrollbar { width: 10px; height: 10px; }
html::-webkit-scrollbar-track { background: var(--bg-deep); }
html::-webkit-scrollbar-thumb { background: var(--phosphor-2); border: 2px solid var(--bg-deep); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.65;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0,255,102,0.06), transparent 60%),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(0,229,255,0.04), transparent 60%);
  background-attachment: fixed;
}

/* CRT scanlines */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(180deg,
    rgba(0,0,0,0) 0px, rgba(0,0,0,0) 2px,
    rgba(0,0,0,0.22) 3px, rgba(0,0,0,0) 4px);
  z-index: 9000;
  mix-blend-mode: multiply;
}
/* CRT vignette + flicker */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 55%, rgba(0,0,0,0.6) 100%);
  z-index: 9001;
  animation: flicker 6s infinite steps(40);
}
@keyframes flicker {
  0%, 95%, 100% { opacity: 1; }
  96% { opacity: 0.92; }
  97% { opacity: 1; }
  98% { opacity: 0.95; }
}

a { color: var(--phosphor); text-decoration: none; }
a:hover { color: var(--bg); background: var(--phosphor); }
::selection { background: var(--phosphor); color: var(--bg); }

/* ─── status bar ───────────────────────────────────── */
.statusbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: var(--bg-deep);
  border-bottom: 1px solid var(--phosphor-2);
  font-size: 12px;
  padding: 6px 18px;
  z-index: 100;
  display: flex;
  gap: 22px;
  color: var(--ink-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  box-shadow: 0 0 12px rgba(0,255,102,0.08);
}
.statusbar .seg { display: flex; gap: 8px; }
.statusbar .seg b { color: var(--phosphor); font-weight: 500; }
.statusbar .right { margin-left: auto; }
.dot {
  display: inline-block;
  width: 8px; height: 8px;
  background: var(--phosphor);
  border-radius: 50%;
  vertical-align: 1px;
  margin-right: 6px;
  box-shadow: 0 0 8px var(--phosphor);
  animation: pulse 1.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* ─── header ────────────────────────────────────────── */
.header {
  position: sticky;
  top: 30px;
  z-index: 90;
  background: rgba(10, 10, 13, 0.92);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(8px);
}
.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand {
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.brand .slash { color: var(--phosphor); }
.brand:hover { background: transparent; color: var(--phosphor); }
.brand .ver { color: var(--ink-faint); font-weight: 400; font-size: 11px; }

.nav { display: flex; gap: 4px; margin-left: 32px; }
.nav a {
  font-size: 13px;
  padding: 6px 12px;
  color: var(--ink-dim);
  border: 1px solid transparent;
  letter-spacing: 0.04em;
  text-transform: lowercase;
}
.nav a::before { content: '['; color: var(--ink-faint); margin-right: 4px; }
.nav a::after  { content: ']'; color: var(--ink-faint); margin-left: 4px; }
.nav a:hover {
  background: transparent;
  color: var(--phosphor);
  border-color: var(--rule);
}
.nav a:hover::before, .nav a:hover::after { color: var(--phosphor); }
.nav a.active { color: var(--phosphor); border-color: var(--rule); }
.nav a.active::before, .nav a.active::after { color: var(--phosphor); }

.gh-cta {
  margin-left: auto;
  font-size: 13px;
  padding: 8px 14px;
  border: 1px solid var(--phosphor);
  color: var(--phosphor);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.gh-cta:hover { background: var(--phosphor); color: var(--bg); box-shadow: 0 0 16px var(--phosphor-glow); }

/* ─── layout ────────────────────────────────────────── */
main { padding-top: 30px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }

/* section labels ── [ NN: TITLE ] ─── */
.section-label {
  color: var(--phosphor);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 20px;
  white-space: nowrap;
  overflow: hidden;
  font-weight: 500;
}
.section-label::before { content: '── [ '; color: var(--ink-faint); }
.section-label::after  { content: ' ] ──────────────────────────────────────────────────────────────────────────'; color: var(--ink-faint); }

h1, h2, h3, h4 {
  font-family: var(--mono);
  margin: 0 0 18px;
  letter-spacing: 0.02em;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.18;
}
h1 { font-size: clamp(36px, 5.5vw, 64px); font-weight: 800; }
h2 { font-size: clamp(26px, 3.4vw, 36px); }
h3 { font-size: 16px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--phosphor); }

p { margin: 0 0 16px; color: var(--ink); }
p.lead, .lead { color: var(--ink); font-size: 16px; line-height: 1.7; }
p.dim { color: var(--ink-dim); }

code, pre { font-family: var(--mono); font-size: 13.5px; }
code {
  background: var(--bg-panel);
  border: 1px solid var(--rule-hi);
  color: var(--amber);
  padding: 1px 6px;
}

/* blinking cursor */
.cursor {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  background: var(--phosphor);
  margin-left: 4px;
  vertical-align: -3px;
  box-shadow: 0 0 12px var(--phosphor-glow);
  animation: blink 1.06s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ─── frames (corner-bracket boxes) ────────────────── */
.frame {
  position: relative;
  border: 1px solid var(--rule-hi);
  background: var(--bg-panel);
  padding: 32px;
}
.frame::before,
.frame::after,
.frame > .br-tr,
.frame > .br-bl {
  content: '';
  position: absolute;
  width: 14px; height: 14px;
  pointer-events: none;
}
.frame::before { top: -1px; left: -1px; border-top: 2px solid var(--phosphor); border-left: 2px solid var(--phosphor); }
.frame::after  { bottom: -1px; right: -1px; border-bottom: 2px solid var(--phosphor); border-right: 2px solid var(--phosphor); }
.frame > .br-tr { top: -1px; right: -1px; border-top: 2px solid var(--phosphor); border-right: 2px solid var(--phosphor); }
.frame > .br-bl { bottom: -1px; left: -1px; border-bottom: 2px solid var(--phosphor); border-left: 2px solid var(--phosphor); }

/* ─── HERO ──────────────────────────────────────────── */
.hero { padding: 60px 0 40px; }
.cmd-prompt {
  color: var(--phosphor);
  font-size: 13px;
  letter-spacing: 0.04em;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.cmd-prompt::before { content: 'guest@canvas-code:~$'; color: var(--ink-dim); }

.ascii-logo {
  color: var(--phosphor);
  font-size: clamp(7px, 1.05vw, 13px);
  line-height: 1.05;
  margin: 28px 0 36px;
  text-shadow: 0 0 14px var(--phosphor-glow);
  white-space: pre;
  overflow-x: auto;
  font-weight: 700;
}

.hero h1 { color: var(--ink); }
.hero h1 .accent { color: var(--phosphor); text-shadow: 0 0 22px var(--phosphor-glow); }

.hero-lead { max-width: 640px; color: var(--ink); margin-top: 22px; }
.hero-lead strong { color: var(--amber); font-weight: 500; }

.actions { display: flex; gap: 16px; flex-wrap: wrap; margin: 36px 0 22px; }
.btn {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 14px 22px;
  border: 1px solid var(--rule-hi);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  position: relative;
  text-transform: lowercase;
  transition: none;
  display: inline-block;
}
.btn::before { content: '> '; color: var(--phosphor); }
.btn:hover { color: var(--bg); background: var(--phosphor); border-color: var(--phosphor); box-shadow: 0 0 22px var(--phosphor-glow); }
.btn:hover::before { color: var(--bg); }
.btn-primary {
  border-color: var(--phosphor);
  color: var(--phosphor);
  background: rgba(0, 255, 102, 0.06);
}
.btn-magenta {
  border-color: var(--magenta);
  color: var(--magenta);
}
.btn-magenta::before { color: var(--magenta); }
.btn-magenta:hover { background: var(--magenta); color: var(--bg); box-shadow: 0 0 22px rgba(255, 44, 112, 0.45); }
.btn-magenta:hover::before { color: var(--bg); }

.hero-meta {
  color: var(--ink-faint);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.hero-meta span { color: var(--phosphor); }

/* ─── stats ────────────────────────────────────────── */
.stats {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 36px 0;
  margin-top: 40px;
  background: repeating-linear-gradient(90deg,
    transparent, transparent 79px,
    var(--rule) 79px, var(--rule) 80px);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.stat {
  padding: 18px 24px;
  border-left: 1px solid var(--rule);
  position: relative;
}
.stat:first-child { border-left: 0; }
.stat-tag { font-size: 11px; color: var(--ink-faint); letter-spacing: 0.12em; margin-bottom: 6px; }
.stat-num {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  color: var(--phosphor);
  text-shadow: 0 0 16px var(--phosphor-glow);
  line-height: 1;
  margin-bottom: 10px;
}
.stat-label { font-size: 11.5px; color: var(--ink-dim); letter-spacing: 0.1em; text-transform: uppercase; }

/* ─── copy / prose section ───────────────────── */
.copy { max-width: 760px; }
.copy h2 { color: var(--ink); }
.copy h2 .hl { color: var(--phosphor); }
.copy em { color: var(--amber); font-style: normal; border-bottom: 1px dashed var(--amber); }

/* ─── how cards ─────────────────────────────────────── */
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 32px 0 40px;
}
.how-card {
  background: var(--bg-panel);
  border: 1px solid var(--rule-hi);
  padding: 24px;
  position: relative;
}
.how-card::before { content: '╭'; position: absolute; top: -6px; left: 6px; color: var(--phosphor); font-size: 18px; line-height: 1; background: var(--bg); padding: 0 4px; }
.how-card::after  { content: '╯'; position: absolute; bottom: -10px; right: 6px; color: var(--phosphor); font-size: 18px; line-height: 1; background: var(--bg); padding: 0 4px; }
.how-card .num { color: var(--phosphor); font-size: 11px; letter-spacing: 0.18em; margin-bottom: 14px; }
.how-card h3 { color: var(--ink); font-size: 16px; margin-bottom: 8px; text-transform: none; letter-spacing: 0.01em; }
.how-card .tag {
  font-size: 11px;
  color: var(--amber);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: block;
}
.how-card p { color: var(--ink-dim); font-size: 13.5px; margin: 0; }

.diagram {
  background: var(--bg-deep);
  border: 1px solid var(--rule-hi);
  border-left: 3px solid var(--phosphor);
  padding: 22px 26px;
  font-size: 12.5px;
  color: var(--phosphor);
  overflow-x: auto;
  white-space: pre;
  text-shadow: 0 0 6px rgba(0,255,102,0.25);
  margin: 24px 0 0;
}

/* ─── features grid ──────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--rule);
  margin-top: 28px;
}
.feature {
  padding: 26px 24px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  position: relative;
  background: var(--bg-panel);
}
.feature:nth-child(3n) { border-right: 0; }
.feature:nth-last-child(-n+3) { border-bottom: 0; }
.feature::before {
  content: '▸';
  color: var(--phosphor);
  font-size: 18px;
  margin-right: 8px;
  position: absolute;
  left: 14px;
  top: 26px;
}
.feature-body { padding-left: 22px; }
.feature h3 { font-size: 13px; color: var(--phosphor); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.08em; }
.feature p { font-size: 13px; color: var(--ink-dim); margin: 0; line-height: 1.6; }
.feature:hover { background: var(--bg-deep); }
.feature:hover::before { color: var(--amber); }

/* ─── seo / item list ──────────────────────────────────────── */
.seo-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px 32px;
  font-size: 14px;
}
.seo-list li {
  padding: 8px 0 8px 22px;
  position: relative;
  border-bottom: 1px dashed var(--rule);
  color: var(--ink-dim);
}
.seo-list li::before {
  content: '[+]';
  color: var(--phosphor);
  position: absolute;
  left: 0;
  font-weight: 700;
  font-size: 12px;
  top: 9px;
}
.seo-list code { font-size: 12px; }

/* ─── install / step list ─────────────────────────────────── */
.steps {
  list-style: none;
  padding: 0;
  margin: 28px 0;
  counter-reset: step;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--rule);
}
.steps li {
  position: relative;
  padding: 22px 0 22px 100px;
  border-bottom: 1px solid var(--rule);
  counter-increment: step;
  color: var(--ink-dim);
  font-size: 14px;
}
.steps li::before {
  content: '$ step ' counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 24px;
  color: var(--phosphor);
  font-size: 12px;
  letter-spacing: 0.08em;
  font-weight: 700;
}
.steps li strong {
  color: var(--ink);
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
  font-size: 14.5px;
}

.install-note { color: var(--ink-dim); font-size: 13.5px; }
.install-cta { display: flex; gap: 16px; margin-top: 28px; flex-wrap: wrap; }
.btn-link {
  border: none;
  padding: 14px 4px;
  color: var(--cyan);
  background: transparent;
}
.btn-link::before { content: '> '; color: var(--cyan); }
.btn-link:hover { background: transparent; color: var(--ink); text-decoration: underline; }
.btn-link:hover::before { color: var(--ink); }

/* ─── support / cta band ─────────────────────────────────── */
.support {
  margin-top: 60px;
  padding: 60px 40px;
  position: relative;
  text-align: center;
  background:
    radial-gradient(ellipse at top, rgba(0,255,102,0.08), transparent 60%),
    var(--bg-panel);
  border: 1px solid var(--phosphor-2);
}
.support::before, .support::after {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
}
.support::before { top: -1px; left: -1px; border-top: 2px solid var(--phosphor); border-left: 2px solid var(--phosphor); }
.support::after  { bottom: -1px; right: -1px; border-bottom: 2px solid var(--phosphor); border-right: 2px solid var(--phosphor); }
.support h2 { color: var(--ink); }
.support p { color: var(--ink-dim); max-width: 580px; margin: 0 auto 28px; }
.support .actions { justify-content: center; }

/* ─── footer ────────────────────────────────────────── */
.footer {
  margin-top: 80px;
  padding: 60px 0 40px;
  border-top: 1px solid var(--rule);
  font-size: 13px;
  background: var(--bg-deep);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer h4 {
  font-size: 11px;
  color: var(--phosphor);
  letter-spacing: 0.18em;
  margin: 0 0 14px;
  text-transform: uppercase;
}
.footer h4::before { content: '// '; color: var(--ink-faint); }
.footer-col a {
  display: block;
  padding: 4px 0;
  color: var(--ink-dim);
  font-size: 13px;
}
.footer-col a:hover { color: var(--phosphor); background: transparent; }
.footer-tagline { color: var(--ink-faint); font-size: 12px; margin-top: 8px; }
.footer-strip {
  margin-top: 50px;
  padding-top: 22px;
  border-top: 1px dashed var(--rule);
  display: flex;
  justify-content: space-between;
  color: var(--ink-faint);
  font-size: 12px;
  letter-spacing: 0.06em;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-strip a { color: var(--ink-dim); }
.footer-strip a:hover { color: var(--phosphor); background: transparent; }

/* ─── responsive ────────────────────────────────────── */
@media (max-width: 900px) {
  .nav { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: 0; }
  .how-grid, .features-grid { grid-template-columns: 1fr; }
  .feature, .feature:nth-child(3n) { border-right: 0; }
  .seo-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 540px) {
  .statusbar { font-size: 10px; gap: 14px; padding: 6px 10px; }
  .statusbar .seg.middle { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .ascii-logo { font-size: 5px; }
}

/* draw initial boot ascii animation only on first paint of hero */
.hero .ascii-logo { animation: typeIn 0.9s steps(28) both; }
@keyframes typeIn {
  from { clip-path: inset(0 100% 0 0); }
  to   { clip-path: inset(0 0 0 0); }
}

/* ─── TOC / directory listing (tutorial) ────────── */
.toc {
  background: var(--bg-panel);
  border: 1px solid var(--rule-hi);
  border-left: 3px solid var(--phosphor);
  padding: 22px 26px;
  margin: 0 0 40px;
}
.toc h3 { color: var(--phosphor); font-size: 12px; text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 16px; }
.toc h3::before { content: '// '; color: var(--ink-faint); }
.toc ol { list-style: none; padding: 0; margin: 0; counter-reset: tocstep; columns: 2; column-gap: 36px; }
.toc ol li { counter-increment: tocstep; padding: 4px 0 4px 38px; position: relative; break-inside: avoid; }
.toc ol li::before { content: '[' counter(tocstep, decimal-leading-zero) ']'; position: absolute; left: 0; color: var(--phosphor); font-weight: 700; font-size: 12px; top: 4px; }
.toc ol li a { color: var(--ink-dim); font-size: 13.5px; }
.toc ol li a:hover { color: var(--phosphor); background: transparent; }

/* ─── Callout — amber-edged note ──────────────────── */
.callout {
  background: rgba(255, 176, 0, 0.04);
  border: 1px solid rgba(255, 176, 0, 0.35);
  border-left: 3px solid var(--amber);
  padding: 16px 20px 16px 38px;
  margin: 18px 0;
  color: var(--ink-dim);
  font-size: 14px;
  position: relative;
}
.callout strong { color: var(--amber); font-weight: 700; }
.callout::before { content: '!'; color: var(--amber); font-weight: 700; position: absolute; left: 18px; top: 16px; font-size: 14px; }
.callout em { color: var(--ink); font-style: normal; }

/* ─── code blocks ─────────────────────────────────── */
pre.code-block {
  background: var(--bg-deep);
  border: 1px solid var(--rule-hi);
  border-left: 3px solid var(--phosphor);
  padding: 18px 22px;
  font-size: 12.5px;
  color: var(--ink);
  overflow-x: auto;
  margin: 18px 0;
  line-height: 1.55;
  white-space: pre;
}
pre.code-block code { background: transparent; border: none; color: inherit; padding: 0; }

/* ─── FAQ (details/summary) ───────────────────────── */
.faq details {
  border: 1px solid var(--rule);
  background: var(--bg-panel);
  margin-bottom: 8px;
}
.faq summary {
  padding: 14px 18px 14px 42px;
  color: var(--ink);
  font-size: 14px;
  cursor: pointer;
  position: relative;
  list-style: none;
  font-weight: 600;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: '[+]';
  position: absolute;
  left: 14px;
  top: 14px;
  color: var(--phosphor);
  font-weight: 700;
  font-size: 12px;
}
.faq details[open] summary::before { content: '[-]'; }
.faq summary:hover { background: var(--bg-deep); color: var(--phosphor); }
.faq details p {
  padding: 0 18px 16px 42px;
  color: var(--ink-dim);
  font-size: 13.5px;
  margin: 0;
}
.faq details code { font-size: 12.5px; }

/* ─── prose list styles in .copy sections ─────────── */
.copy ul {
  list-style: none;
  padding: 0;
  margin: 14px 0 16px;
}
.copy ul li {
  padding: 6px 0 6px 22px;
  position: relative;
  color: var(--ink-dim);
  font-size: 14.5px;
  line-height: 1.65;
}
.copy ul li::before {
  content: '▸';
  color: var(--phosphor);
  position: absolute;
  left: 0;
  font-size: 14px;
  top: 6px;
}
.copy ul li strong { color: var(--ink); font-weight: 600; }

/* ─── 404 / error screen ──────────────────────────── */
.error-screen {
  min-height: calc(100vh - 360px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 24px;
}
.error-screen-inner { max-width: 640px; }
.error-num {
  font-family: var(--mono);
  font-size: clamp(96px, 18vw, 200px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--phosphor);
  text-shadow: 0 0 32px var(--phosphor-glow), 0 0 8px var(--phosphor);
  margin: 0 0 18px;
  animation: errorFlicker 2.4s infinite steps(20);
}
@keyframes errorFlicker {
  0%, 92%, 100% { opacity: 1; }
  94% { opacity: 0.55; }
  95% { opacity: 1; }
  96% { opacity: 0.75; }
}
.error-screen h1 { color: var(--ink); margin-bottom: 18px; font-size: clamp(22px, 3vw, 32px); }
.error-screen .error-cmd { color: var(--magenta); font-size: 13px; margin-bottom: 8px; letter-spacing: 0.06em; }
.error-screen .lead { color: var(--ink-dim); max-width: 520px; margin: 0 auto 28px; }
.error-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; margin-bottom: 40px; }
.error-suggest {
  border-top: 1px dashed var(--rule);
  padding-top: 24px;
  max-width: 520px;
  margin: 0 auto;
}
.error-suggest p { color: var(--ink-faint); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; margin: 0 0 14px; }
.error-chips { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.error-chips a {
  padding: 6px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--rule-hi);
  color: var(--ink-dim);
  font-size: 13px;
}
.error-chips a::before { content: '['; color: var(--ink-faint); margin-right: 4px; }
.error-chips a::after { content: ']'; color: var(--ink-faint); margin-left: 4px; }
.error-chips a:hover {
  background: transparent;
  color: var(--phosphor);
  border-color: var(--phosphor);
}
.error-chips a:hover::before, .error-chips a:hover::after { color: var(--phosphor); }

@media (max-width: 720px) {
  .toc ol { columns: 1; }
}