/* ============================================================
   Dhruv — Rust systems portfolio
   Dark-first, with a light theme that keeps the same structure.

   Layer order, roughly:
     backdrop (gears, grid, hex field)  →  surfaces  →  content
   Every animation here is disabled under prefers-reduced-motion,
   which is handled once at the bottom of this file.
   ============================================================ */

:root {
  --bg:        #07080c;
  --bg-alt:    #0b0d13;
  --surface:   #12151d;
  --surface-2: #191d28;
  --border:    #232838;
  --border-bright: #343c50;

  --text:      #e9edf4;
  --text-mid:  #b2bccb;
  --muted:     #7b8598;
  --faint:     #4a5265;

  /* Rust's own orange threads the page together; the three project
     accents branch off it. */
  --rust:   #f74c00;
  --chain:  #ff7a45;
  --resp:   #2dd4bf;
  --cli:    #a78bfa;
  --accent: var(--chain);

  --ok:     #4ade80;
  --warn:   #fbbf24;
  --danger: #fb7185;

  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;

  --radius:    14px;
  --radius-sm: 9px;
  --wrap:      1140px;

  --shadow: 0 1px 2px rgba(0,0,0,.5), 0 14px 40px -16px rgba(0,0,0,.75);
  --glow:   0 0 0 1px color-mix(in srgb, var(--accent) 26%, transparent),
            0 8px 30px -14px color-mix(in srgb, var(--accent) 65%, transparent);

  --grid-line: rgba(255,255,255,.028);
  --gear-ink:  rgba(255,255,255,.05);
  --noise:     .035;
}

:root[data-theme="light"] {
  --bg:        #fbfaf9;
  --bg-alt:    #f4f4f7;
  --surface:   #ffffff;
  --surface-2: #f6f6fa;
  --border:    #e3e4ea;
  --border-bright: #cbcdd8;

  --text:      #12151c;
  --text-mid:  #414a59;
  --muted:     #69717f;
  --faint:     #a4aab7;

  --rust:   #d43900;
  --chain:  #d94a12;
  --resp:   #0d9488;
  --cli:    #7c50e0;

  --ok:     #15803d;
  --warn:   #a16207;
  --danger: #be123c;

  --shadow: 0 1px 2px rgba(16,20,30,.06), 0 12px 30px -16px rgba(16,20,30,.25);

  --grid-line: rgba(10,14,25,.04);
  --gear-ink:  rgba(190,70,20,.08);
  --noise:     .02;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

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

.wrap { width: min(var(--wrap), calc(100% - 2.5rem)); margin-inline: auto; }

.skip-link {
  position: absolute; left: -9999px;
  background: var(--rust); color: #fff; padding: .7rem 1.1rem;
  border-radius: 0 0 var(--radius-sm) 0; z-index: 200; font-weight: 600;
}
.skip-link:focus { left: 0; top: 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

h1, h2, h3, h4 { line-height: 1.15; letter-spacing: -.02em; margin: 0; font-weight: 650; }
p { margin: 0; }
code { font-family: var(--mono); font-size: .89em; }

/* ══════════════════════════ backdrop ═══════════════════════════
   Fixed layers behind everything: an engineering grid, three slowly
   turning Rust gears, and a canvas of drifting hex digits. All of it
   decorative and inert.
   ═════════════════════════════════════════════════════════════ */

.backdrop {
  position: fixed; inset: 0; z-index: -2; pointer-events: none; overflow: hidden;
  background:
    radial-gradient(900px 520px at 12% -6%, color-mix(in srgb, var(--rust) 13%, transparent), transparent 68%),
    radial-gradient(760px 460px at 88% 2%,  color-mix(in srgb, var(--resp) 10%, transparent), transparent 68%),
    radial-gradient(680px 520px at 50% 108%, color-mix(in srgb, var(--cli)  9%, transparent), transparent 70%);
}

.backdrop-grid {
  position: absolute; inset: -2px;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 30%, transparent 100%);
  mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 30%, transparent 100%);
}

.gear { position: absolute; color: var(--gear-ink); animation: gear-turn 170s linear infinite; }
.gear svg { width: 100%; height: 100%; display: block; }
.gear-a { width: 44vmax; height: 44vmax; top: -16vmax; right: -12vmax; }
.gear-b { width: 26vmax; height: 26vmax; top: 15vmax; right: 13vmax; animation-duration: 105s; animation-direction: reverse; }
.gear-c { width: 36vmax; height: 36vmax; bottom: -13vmax; left: -11vmax; animation-duration: 210s; }
@keyframes gear-turn { to { transform: rotate(360deg); } }

#hexfield {
  position: absolute; inset: 0; width: 100%; height: 100%; opacity: .55;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 40%, transparent 76%);
  mask-image: linear-gradient(to bottom, #000 0%, #000 40%, transparent 76%);
}

/* Film grain, so the large flat panels do not band. */
.backdrop::after {
  content: ""; position: absolute; inset: 0; opacity: var(--noise);
  background-image: url("data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 width=%22140%22 height=%22140%22%3E%3Cfilter id=%22n%22%3E%3CfeTurbulence type=%22fractalNoise%22 baseFrequency=%22.85%22 numOctaves=%223%22/%3E%3C/filter%3E%3Crect width=%22140%22 height=%22140%22 filter=%22url(%23n)%22/%3E%3C/svg%3E");
}

/* ═══════════════════════ scroll progress ═══════════════════════ */

.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 60;
  transform-origin: 0 50%; transform: scaleX(0);
  background: linear-gradient(90deg, var(--rust), var(--chain) 28%, var(--resp) 64%, var(--cli));
  box-shadow: 0 0 12px color-mix(in srgb, var(--rust) 55%, transparent);
}

/* ═══════════════════════════ topbar ════════════════════════════ */

.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 76%, transparent);
  backdrop-filter: blur(16px) saturate(1.3);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, background .25s;
}
.topbar.stuck { border-bottom-color: var(--border); background: color-mix(in srgb, var(--bg) 90%, transparent); }
.topbar-inner { display: flex; align-items: center; gap: 1.25rem; height: 64px; }

.brand { display: flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--text); font-weight: 650; flex-shrink: 0; }
.brand-gear { width: 22px; height: 22px; color: var(--rust); flex-shrink: 0; }
.brand-gear svg { width: 100%; height: 100%; display: block; transition: transform .9s cubic-bezier(.22,1,.36,1); }
.brand:hover .brand-gear svg { transform: rotate(180deg); }
.brand-text { font-family: var(--mono); font-size: .95rem; letter-spacing: -.01em; }
.brand-text::before { content: "$ "; color: var(--faint); }

.topnav { display: flex; gap: 1.5rem; margin-left: auto; }
.topnav a {
  position: relative; color: var(--muted); text-decoration: none;
  font-size: .89rem; font-weight: 500; padding: .3rem 0; white-space: nowrap;
  transition: color .18s;
}
.topnav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1.5px;
  background: var(--accent); transform: scaleX(0); transform-origin: 0 50%;
  transition: transform .26s cubic-bezier(.22,1,.36,1);
}
.topnav a:hover { color: var(--text); }
.topnav a.active { color: var(--text); }
.topnav a:hover::after, .topnav a.active::after { transform: scaleX(1); }
.topnav a[href="#blockchain"]  { --accent: var(--chain); }
.topnav a[href="#redis"]       { --accent: var(--resp); }
.topnav a[href="#cli"]         { --accent: var(--cli); }
.topnav a[href="#engineering"] { --accent: var(--rust); }

.topbar-tools { display: flex; align-items: center; gap: .5rem; }

.icon-button {
  display: grid; place-items: center; width: 34px; height: 34px;
  border: 1px solid var(--border); border-radius: 9px;
  background: var(--surface); color: var(--text-mid);
  cursor: pointer; font-size: .95rem;
  transition: border-color .18s, color .18s, transform .18s;
}
.icon-button:hover { border-color: var(--border-bright); color: var(--text); transform: translateY(-1px); }
.icon-button [data-theme-icon] { transition: transform .45s cubic-bezier(.22,1,.36,1); }
.icon-button:hover [data-theme-icon] { transform: rotate(160deg); }

@media (max-width: 900px) {
  .topnav {
    gap: 1.1rem; overflow-x: auto; scrollbar-width: none;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 14px, #000 calc(100% - 14px), transparent);
    mask-image: linear-gradient(90deg, transparent, #000 14px, #000 calc(100% - 14px), transparent);
  }
  .topnav::-webkit-scrollbar { display: none; }
  .topnav a { font-size: .82rem; }
  .brand-text { display: none; }
}

/* ════════════════════════════ hero ═════════════════════════════ */

.hero { padding: clamp(3.5rem, 9vw, 7rem) 0 clamp(3rem, 7vw, 4.5rem); position: relative; }

.hero-badge {
  display: inline-flex; align-items: center; gap: .55rem;
  font-family: var(--mono); font-size: .74rem; letter-spacing: .06em;
  text-transform: uppercase; color: var(--text-mid);
  padding: .34rem .85rem .34rem .7rem;
  border: 1px solid var(--border); border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 65%, transparent);
  margin-bottom: 1.4rem;
}
.hero-badge .dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--ok); flex-shrink: 0;
  animation: pulse-dot 2.4s ease-out infinite;
}
@keyframes pulse-dot {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--ok) 60%, transparent); }
  70%  { box-shadow: 0 0 0 7px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

.eyebrow {
  font-family: var(--mono); font-size: .78rem; letter-spacing: .09em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 1rem;
}

.hero h1 { font-size: clamp(2.4rem, 6.4vw, 4.3rem); font-weight: 700; letter-spacing: -.038em; }
.hero h1 .word { display: inline-block; }
/* Words rise into place one after another once JS has split them. */
.reveal-words .word {
  opacity: 0; transform: translateY(.5em) rotate(1.5deg);
  animation: word-up .72s cubic-bezier(.22,1,.36,1) forwards;
  animation-delay: calc(var(--i) * 55ms);
}
@keyframes word-up { to { opacity: 1; transform: none; } }

/* Ordered so neighbouring stops interpolate through a colour worth
   looking at — orange straight into teal turns to mud halfway. */
.grad {
  background: linear-gradient(100deg,
    var(--rust) 0%, var(--chain) 20%, var(--cli) 56%, var(--resp) 86%, var(--cli) 100%);
  background-size: 190% 100%;
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: grad-drift 11s ease-in-out infinite;
}
@keyframes grad-drift {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

.lede { max-width: 62ch; margin-top: 1.4rem; font-size: clamp(1.02rem, 1.6vw, 1.16rem); color: var(--text-mid); }
.lede strong { color: var(--text); font-weight: 600; }

/* ───────────────────── cargo build terminal ──────────────────── */

.term {
  margin-top: 2.4rem; max-width: 730px;
  background: color-mix(in srgb, var(--bg-alt) 86%, transparent);
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.term-bar {
  display: flex; align-items: center; gap: .5rem;
  padding: .6rem .9rem; border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 75%, transparent);
}
.term-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.term-dot:nth-child(1) { background: color-mix(in srgb, var(--danger) 75%, transparent); }
.term-dot:nth-child(2) { background: color-mix(in srgb, var(--warn) 75%, transparent); }
.term-dot:nth-child(3) { background: color-mix(in srgb, var(--ok) 70%, transparent); }
.term-title {
  font-family: var(--mono); font-size: .76rem; color: var(--muted); margin-left: .5rem;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.term-target {
  margin-left: auto; font-family: var(--mono); font-size: .68rem; color: var(--rust);
  border: 1px solid color-mix(in srgb, var(--rust) 35%, var(--border));
  border-radius: 999px; padding: .1rem .55rem; white-space: nowrap; flex-shrink: 0;
}
@media (max-width: 620px) { .term-target { display: none; } }

/* Tall enough for the whole log up front, so lines appearing one by
   one never push the stat row down the page. */
.term-body {
  margin: 0; padding: 1rem 1.1rem .5rem;
  font-family: var(--mono); font-size: clamp(.68rem, 1.9vw, .8rem);
  line-height: 1.85; color: var(--text-mid);
  min-height: 13em; overflow-x: auto; white-space: pre;
}
.term-body .t-prompt { color: var(--rust); }
.term-body .t-cmd    { color: var(--text); }
.term-body .t-verb   { color: var(--ok); font-weight: 700; }
.term-body .t-crate  { color: var(--text); }
.term-body .t-dim    { color: var(--faint); }
.term-line { display: block; animation: line-in .34s ease-out both; }
@keyframes line-in { from { opacity: 0; transform: translateX(-6px); } to { opacity: 1; transform: none; } }

.caret {
  display: inline-block; width: .55em; height: 1em; vertical-align: -.14em;
  background: var(--rust); margin-left: 2px; animation: blink 1.05s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.term.done .caret { display: none; }

.wasm-status {
  display: flex; align-items: center; gap: .6rem;
  margin: 0; padding: .7rem 1.1rem;
  border-top: 1px solid var(--border);
  font-family: var(--mono); font-size: .78rem; color: var(--muted);
  background: color-mix(in srgb, var(--surface) 50%, transparent);
}
.wasm-status.ready  { color: var(--ok); }
.wasm-status.failed { color: var(--danger); }
.wasm-status.ready::before  { content: "◆"; }
.wasm-status.failed::before { content: "✕"; }
.wasm-status.ready .spinner, .wasm-status.failed .spinner { display: none; }

.spinner {
  width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0;
  border: 2px solid var(--faint); border-top-color: var(--rust);
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─────────────────────────── stat row ────────────────────────── */

.stat-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px; margin-top: 2.5rem;
  background: var(--border); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.stat { position: relative; background: var(--surface); padding: 1.3rem 1.35rem; overflow: hidden; }
.stat::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity .3s;
  background: radial-gradient(190px 130px at var(--mx, 50%) var(--my, 50%),
              color-mix(in srgb, var(--rust) 15%, transparent), transparent 70%);
}
.stat:hover::before { opacity: 1; }
.stat > * { position: relative; }
.stat-value {
  display: block; font-family: var(--mono); font-size: 1.9rem;
  font-weight: 600; letter-spacing: -.03em; color: var(--text);
  font-variant-numeric: tabular-nums;
}
.stat-value .unit { font-size: .95rem; color: var(--muted); margin-left: 1px; }
.stat-label { display: block; font-size: .82rem; color: var(--muted); margin-top: .15rem; }

/* auto-fit leaves a lone fourth cell and a hole beside it at these
   widths; an explicit 2 x 2 reads as a deliberate block. */
@media (max-width: 820px) {
  .stat-row { grid-template-columns: repeat(2, 1fr); }
}

/* ════════════════════════ crate marquee ════════════════════════ */

.marquee {
  border-block: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 40%, transparent);
  overflow: hidden; padding: .72rem 0;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee-track { display: flex; width: max-content; animation: marquee 46s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }
.marquee-item {
  display: flex; align-items: center; gap: 1.9rem; padding-right: 1.9rem;
  font-family: var(--mono); font-size: .78rem; color: var(--muted); white-space: nowrap;
}
.marquee-item::after { content: "◆"; color: var(--faint); font-size: .5rem; }
.marquee-item b { color: var(--rust); font-weight: 600; }

/* ══════════════════════════ project ════════════════════════════ */

.project { padding: clamp(3.5rem, 8vw, 6rem) 0; position: relative; }
.project[data-accent="chain"] { --accent: var(--chain); }
.project[data-accent="resp"]  { --accent: var(--resp); background: color-mix(in srgb, var(--bg-alt) 80%, transparent); }
.project[data-accent="cli"]   { --accent: var(--cli); }
.project, .engineering, .runtime { border-top: 1px solid var(--border); }

/* A numbered rail in the left margin, on wide screens only. */
.project-index {
  position: absolute; left: max(1rem, calc(50% - var(--wrap) / 2 - 3.4rem));
  top: clamp(3.5rem, 8vw, 6rem);
  font-family: var(--mono); font-size: .72rem; letter-spacing: .14em;
  color: var(--accent); writing-mode: vertical-rl;
  display: flex; align-items: center; gap: .8rem; opacity: .8;
}
.project-index::after { content: ""; width: 1px; height: 4.5rem; background: linear-gradient(var(--accent), transparent); }
@media (max-width: 1340px) { .project-index { display: none; } }

.project-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.project-head h2 {
  font-size: clamp(1.9rem, 3.8vw, 2.7rem); margin-bottom: .85rem;
  display: flex; align-items: center; gap: .75rem; flex-wrap: wrap;
}
.project-head h2::before {
  content: ""; width: 9px; height: 9px; border-radius: 2px; flex-shrink: 0;
  background: var(--accent); box-shadow: 0 0 14px var(--accent);
}
.project-head .eyebrow { color: var(--accent); }
.project-lede { max-width: 60ch; color: var(--text-mid); font-size: 1.02rem; }

.repo-link {
  flex-shrink: 0; text-decoration: none; font-size: .88rem; font-weight: 550;
  color: var(--text); padding: .58rem 1.05rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border-bright); background: var(--surface);
  transition: border-color .18s, background .18s, transform .18s, box-shadow .25s;
}
.repo-link:hover { border-color: var(--accent); background: var(--surface-2); transform: translateY(-2px); box-shadow: var(--glow); }

.tag-row { display: flex; flex-wrap: wrap; gap: .5rem; list-style: none; padding: 0; margin: 1.65rem 0 0; }
.tag-row li {
  font-family: var(--mono); font-size: .76rem; color: var(--muted);
  padding: .3rem .68rem; border: 1px solid var(--border); border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 65%, transparent);
  transition: color .2s, border-color .2s, transform .2s;
}
.tag-row li:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }

/* ═══════════════════════════ demo ══════════════════════════════ */

.demo {
  position: relative; margin-top: 2.25rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
  transition: border-color .3s;
}
/* Cursor-tracking highlight. Decorative, and never above content. */
.demo::after {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  opacity: 0; transition: opacity .35s;
  background: radial-gradient(440px 320px at var(--mx, 50%) var(--my, 0%),
              color-mix(in srgb, var(--accent) 9%, transparent), transparent 72%);
}
.demo:hover::after { opacity: 1; }
.demo:hover { border-color: color-mix(in srgb, var(--accent) 30%, var(--border)); }

.demo-head, .demo-body { position: relative; z-index: 1; }
.demo-head {
  padding: 1.35rem 1.6rem; border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-2) 85%, transparent);
  display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap;
}
.demo-head > div { flex: 1 1 22rem; min-width: 0; }
.demo-head h3 { font-size: 1.06rem; }
.demo-head p { font-size: .89rem; color: var(--muted); margin-top: .3rem; max-width: 68ch; }
.demo-head code { color: var(--accent); }
.demo-chip {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .05em; text-transform: uppercase;
  color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  border-radius: 999px; padding: .18rem .62rem; white-space: nowrap; flex-shrink: 0;
}
.demo-body { padding: 1.6rem; }

.control { margin-bottom: 1.25rem; }
.control > label {
  display: flex; align-items: baseline; gap: .6rem; flex-wrap: wrap;
  font-size: .86rem; font-weight: 550; margin-bottom: .55rem;
}
.hint { font-weight: 400; font-size: .78rem; color: var(--muted); }

.slider-row { display: flex; align-items: center; gap: 1rem; }
.slider-row output {
  font-family: var(--mono); font-size: .92rem; color: var(--accent);
  min-width: 6.5ch; text-align: right; font-weight: 600; font-variant-numeric: tabular-nums;
}

/* --fill is kept in step with the value by app.js, so the track fills
   up to the thumb instead of staying uniformly grey. */
input[type="range"] {
  -webkit-appearance: none; appearance: none; flex: 1;
  height: 4px; border-radius: 2px; cursor: pointer;
  background: linear-gradient(90deg,
    var(--accent) calc(var(--fill, 0) * 1%),
    var(--border-bright) calc(var(--fill, 0) * 1%));
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 17px; height: 17px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--surface);
  box-shadow: 0 0 0 1px var(--accent); cursor: pointer;
  transition: transform .16s, box-shadow .16s;
}
input[type="range"]:hover::-webkit-slider-thumb {
  transform: scale(1.15);
  box-shadow: 0 0 0 1px var(--accent), 0 0 0 6px color-mix(in srgb, var(--accent) 22%, transparent);
}
input[type="range"]::-moz-range-thumb {
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--surface);
  box-shadow: 0 0 0 1px var(--accent); cursor: pointer;
}

input[type="text"], input[type="number"], textarea {
  font-family: var(--mono); font-size: .88rem;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border-bright); border-radius: var(--radius-sm);
  padding: .58rem .75rem; width: 100%;
  transition: border-color .18s, box-shadow .18s;
}
input[type="text"]:focus, input[type="number"]:focus, textarea:focus {
  border-color: var(--accent); outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}
textarea { resize: vertical; line-height: 1.6; }

.tx-inputs { display: flex; align-items: center; gap: .55rem; flex-wrap: wrap; }
.tx-inputs input[type="text"] { flex: 1 1 110px; min-width: 0; }
.tx-inputs input[type="number"] { flex: 0 0 100px; }
.arrow { color: var(--muted); flex-shrink: 0; }

.field-error { font-size: .82rem; color: var(--danger); margin-top: .5rem; font-family: var(--mono); }

.button-row { display: flex; flex-wrap: wrap; gap: .6rem; }

.btn {
  position: relative; overflow: hidden;
  font-family: inherit; font-size: .87rem; font-weight: 550;
  padding: .58rem 1.05rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border-bright); background: var(--surface-2);
  color: var(--text); cursor: pointer;
  transition: background .18s, border-color .18s, transform .12s, opacity .18s, box-shadow .25s;
}
/* A sheen sweeps across on hover. */
.btn::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(105deg, transparent 35%, rgba(255,255,255,.15) 50%, transparent 65%);
  transform: translateX(-120%);
}
.btn:hover:not(:disabled)::before { transition: transform .65s ease; transform: translateX(120%); }
.btn:hover:not(:disabled) { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--glow); }
.btn:active:not(:disabled) { transform: translateY(0); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

.btn-primary { background: var(--accent); border-color: var(--accent); color: #0b0d12; font-weight: 600; }
:root[data-theme="light"] .btn-primary { color: #fff; }
.btn-primary:hover:not(:disabled) { filter: brightness(1.1); }

.btn-danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.btn-danger:hover:not(:disabled) { border-color: var(--danger); box-shadow: 0 8px 30px -14px var(--danger); }

.btn-ghost { background: transparent; color: var(--muted); }
.btn-ghost:hover:not(:disabled) { color: var(--text); }

/* ═══════════════════════ blockchain demo ═══════════════════════ */

.mining-panel {
  margin: 1.4rem 0; padding: 1.05rem 1.15rem;
  background: var(--bg); border: 1px solid var(--accent); border-radius: var(--radius-sm);
  box-shadow: 0 0 40px -18px var(--accent);
  animation: mining-glow 1.9s ease-in-out infinite;
}
@keyframes mining-glow {
  0%, 100% { box-shadow: 0 0 40px -18px var(--accent); }
  50%      { box-shadow: 0 0 52px -12px var(--accent); }
}
.mining-row { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin-bottom: .65rem; flex-wrap: wrap; }
.mining-label { font-size: .82rem; color: var(--text-mid); }
.mining-stats { display: flex; gap: 1.1rem; margin-left: auto; font-family: var(--mono); font-size: .8rem; }
.mining-stats b { color: var(--accent); font-weight: 600; font-variant-numeric: tabular-nums; }
.mining-stats span { color: var(--muted); }

/* The target the nonce search is trying to hit, spelled out. */
.mining-target {
  font-family: var(--mono); font-size: .74rem; color: var(--muted);
  margin-bottom: .6rem; display: flex; align-items: center; gap: .5rem; flex-wrap: wrap;
}
.mining-target .target-mask { color: var(--ok); font-weight: 700; letter-spacing: .1em; }

.hash-live {
  font-family: var(--mono); font-size: clamp(.62rem, 1.75vw, .8rem);
  color: var(--muted); word-break: break-all; line-height: 1.5;
}
.hash-live .zeros { color: var(--ok); font-weight: 700; text-shadow: 0 0 12px color-mix(in srgb, var(--ok) 60%, transparent); }

.mining-bar { height: 3px; background: var(--border); border-radius: 2px; margin-top: .8rem; overflow: hidden; }
.mining-bar-fill {
  height: 100%; width: 30%; border-radius: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: sweep 1.1s ease-in-out infinite;
}
@keyframes sweep { 0% { transform: translateX(-120%); } 100% { transform: translateX(420%); } }

.chain-status {
  font-family: var(--mono); font-size: .84rem; padding: .7rem .95rem;
  border-radius: var(--radius-sm); margin-bottom: 1.2rem;
  border: 1px solid var(--border); background: var(--bg); color: var(--text-mid);
  transition: color .25s, border-color .25s;
}
.chain-status.valid   { color: var(--ok);     border-color: color-mix(in srgb, var(--ok) 38%, var(--border)); }
.chain-status.invalid { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 38%, var(--border)); animation: shake .4s ease-out; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%      { transform: translateX(-4px); }
  75%      { transform: translateX(4px); }
}

/* Blocks stack vertically, joined by a link that shows the
   previous-hash pointer as an actual line between them. */
.chain-view { display: flex; flex-direction: column; gap: 1.9rem; }

.block-card {
  position: relative;
  background: var(--bg); border: 1px solid var(--border);
  border-left: 3px solid var(--accent); border-radius: var(--radius-sm);
  padding: .95rem 1.1rem; animation: rise .4s cubic-bezier(.22,1,.36,1);
  transition: border-color .25s, transform .25s;
}
.block-card:hover { transform: translateX(3px); }
.block-card.genesis { border-left-color: var(--faint); }
.block-card.broken {
  border-left-color: var(--danger);
  background: color-mix(in srgb, var(--danger) 6%, var(--bg));
  animation: rise .4s cubic-bezier(.22,1,.36,1), shake .4s ease-out;
}
@keyframes rise { from { opacity: 0; transform: translateY(14px) scale(.985); } to { opacity: 1; transform: none; } }

.block-card + .block-card::before {
  content: ""; position: absolute; left: 26px; top: -1.9rem; width: 2px; height: 1.9rem;
  background: linear-gradient(to bottom, color-mix(in srgb, var(--accent) 25%, transparent), var(--accent));
}
/* A pulse travels down the link, in the direction the hash points. */
.block-card + .block-card::after {
  content: ""; position: absolute; left: 23px; top: -1.9rem;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 10px var(--accent);
  animation: link-flow 2.6s ease-in-out infinite;
}
@keyframes link-flow {
  0%       { transform: translateY(0); opacity: 0; }
  15%      { opacity: 1; }
  85%      { opacity: 1; }
  100%     { transform: translateY(1.65rem); opacity: 0; }
}
.block-card.broken + .block-card::before,
.block-card.broken::before { background: linear-gradient(to bottom, transparent, var(--danger)); }

.block-top { display: flex; align-items: baseline; gap: .8rem; flex-wrap: wrap; margin-bottom: .6rem; }
.block-index { font-family: var(--mono); font-weight: 700; font-size: .92rem; color: var(--accent); }
.block-card.genesis .block-index { color: var(--muted); }
.block-nonce { font-family: var(--mono); font-size: .76rem; color: var(--muted); margin-left: auto; }

.block-field { display: grid; grid-template-columns: 5.6rem 1fr; gap: .5rem; align-items: baseline; margin-bottom: .3rem; }
.block-field dt { font-size: .73rem; color: var(--faint); font-family: var(--mono); text-transform: uppercase; letter-spacing: .05em; }
.block-field dd { margin: 0; font-family: var(--mono); font-size: clamp(.63rem, 1.5vw, .76rem); color: var(--text-mid); word-break: break-all; }
.block-field dd .zeros { color: var(--ok); font-weight: 700; }

.block-txs { margin-top: .7rem; padding-top: .65rem; border-top: 1px dashed var(--border); }
.block-tx { font-family: var(--mono); font-size: .78rem; color: var(--text-mid); }
.block-tx .amt { color: var(--accent); font-weight: 600; }
.block-empty { font-size: .78rem; color: var(--faint); font-style: italic; }

.balances { margin-top: 1.3rem; display: flex; flex-wrap: wrap; gap: .55rem; }
.balance-chip {
  font-family: var(--mono); font-size: .8rem; padding: .35rem .75rem;
  border: 1px solid var(--border); border-radius: 999px; background: var(--bg);
  animation: rise .35s ease-out;
}
.balance-chip .pos { color: var(--ok); }
.balance-chip .neg { color: var(--danger); }

/* ═════════════════════════ resp demo ═══════════════════════════ */

.resp-demo { display: grid; grid-template-columns: 1fr 1fr; gap: 1.6rem; }
@media (max-width: 860px) { .resp-demo { grid-template-columns: 1fr; } }

.resp-pane h4 { font-size: .95rem; margin-bottom: .2rem; }
.pane-note { font-size: .81rem; color: var(--muted); margin-bottom: .8rem; }
.pane-note code { color: var(--accent); }

.preset-row { display: flex; flex-wrap: wrap; gap: .4rem; margin: .7rem 0 .9rem; }
.preset-row button {
  font-family: var(--mono); font-size: .74rem; padding: .28rem .6rem;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg); color: var(--muted); cursor: pointer;
  transition: color .16s, border-color .16s, transform .16s, background .16s;
}
.preset-row button:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.preset-row button:active { transform: translateY(0); }

.wire {
  font-family: var(--mono); font-size: clamp(.68rem, 1.6vw, .8rem);
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: .8rem .9rem; word-break: break-all; line-height: 1.75; color: var(--text-mid);
  min-height: 3.2rem;
}
.wire .crlf { color: var(--faint); }
.wire .len { color: var(--accent); }
.wire .marker { color: var(--cli); font-weight: 700; }
/* The byte dump pulses when the command changes. Deliberately an accent
   flash rather than a wipe — an animation that fails to run must not be
   able to leave the bytes hidden. */
.wire.streaming { animation: wire-flash .55s ease-out; }
@keyframes wire-flash {
  0%   { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent); }
  100% { border-color: var(--border); box-shadow: 0 0 0 0 transparent; }
}

.wire-lines { margin-top: .7rem; display: flex; flex-direction: column; gap: 1px; }
.wire-line {
  font-family: var(--mono); font-size: .76rem; padding: .22rem .6rem;
  background: var(--bg); color: var(--text-mid); border-left: 2px solid var(--border);
  animation: line-in .3s ease-out both; animation-delay: calc(var(--i, 0) * 45ms);
}
.wire-line.hdr { color: var(--muted); border-left-color: var(--accent); }

.decode-status {
  font-family: var(--mono); font-size: .8rem; padding: .55rem .8rem;
  border-radius: var(--radius-sm); margin-bottom: .8rem;
  border: 1px solid var(--border); background: var(--bg); color: var(--text-mid);
  transition: color .25s, border-color .25s;
}
.decode-status.complete   { color: var(--ok);     border-color: color-mix(in srgb, var(--ok) 38%, var(--border)); }
.decode-status.incomplete { color: var(--warn);   border-color: color-mix(in srgb, var(--warn) 38%, var(--border)); }
.decode-status.invalid    { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 38%, var(--border)); }

.tree { font-family: var(--mono); font-size: .8rem; line-height: 1.75; }
.tree-node { padding-left: 1.15rem; border-left: 1px solid var(--border); margin-left: .3rem; }
.tree-row { display: flex; gap: .55rem; align-items: baseline; flex-wrap: wrap; animation: line-in .3s ease-out both; }
.tree-kind { font-size: .68rem; text-transform: uppercase; letter-spacing: .05em; color: var(--faint); flex-shrink: 0; min-width: 4.5rem; }
.tree-val { color: var(--text); word-break: break-all; }
.tree-val.str  { color: var(--ok); }
.tree-val.num  { color: var(--accent); }
.tree-val.err  { color: var(--danger); }
.tree-val.nil  { color: var(--faint); font-style: italic; }
.tree-val.bool { color: var(--cli); }

/* ══════════════════════════ cli demo ═══════════════════════════ */

.result-card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 1.15rem 1.25rem; margin: 1.1rem 0;
  transition: border-color .3s, box-shadow .3s;
}
.result-main {
  font-family: var(--mono); font-size: clamp(1.15rem, 3.4vw, 1.85rem);
  font-weight: 600; letter-spacing: -.02em; word-break: break-all; color: var(--text);
  font-variant-numeric: tabular-nums;
}
.result-card.over { border-color: color-mix(in srgb, var(--warn) 45%, var(--border)); box-shadow: 0 0 40px -20px var(--warn); }
.result-card.over .result-main { color: var(--warn); }
.result-card.error { border-color: color-mix(in srgb, var(--danger) 45%, var(--border)); }
.result-card.error .result-main { color: var(--danger); font-size: 1rem; }
.result-meta { font-family: var(--mono); font-size: .78rem; color: var(--muted); margin-top: .35rem; }

.u32-meter { margin: 1.4rem 0 1rem; }
.u32-meter-track { position: relative; height: 6px; background: var(--border); border-radius: 3px; }
.u32-meter-fill {
  height: 100%; width: 0; border-radius: 3px;
  background: linear-gradient(90deg, var(--cli), var(--accent));
  transition: width .28s ease-out;
}
.u32-meter-fill.over { background: linear-gradient(90deg, var(--cli), var(--accent) 55%, var(--warn)); box-shadow: 0 0 16px var(--warn); }
.u32-meter-marker { position: absolute; top: -5px; width: 1px; height: 16px; background: var(--warn); }
.u32-meter-marker span {
  position: absolute; top: 18px; left: 50%; transform: translateX(-50%);
  font-family: var(--mono); font-size: .68rem; color: var(--warn); white-space: nowrap;
}

.overflow-note {
  display: grid; gap: .45rem; margin-top: 2.1rem; padding: .95rem 1.1rem;
  border: 1px solid color-mix(in srgb, var(--warn) 42%, var(--border));
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--warn) 7%, var(--bg));
  font-size: .85rem; animation: rise .3s ease-out;
}
.overflow-note strong { color: var(--warn); }
/* Only the panic line is its own block; code inside prose stays inline so the
   sentence around it does not break into stacked fragments. */
.overflow-note > code {
  font-size: .78rem; color: var(--danger); background: var(--bg);
  padding: .35rem .6rem; border-radius: 5px; display: block;
}
.overflow-note span { color: var(--muted); font-size: .82rem; }
.overflow-note span code { color: var(--text-mid); background: none; padding: 0; }

.extreme-row { margin-top: 1.5rem; display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.extreme-result { font-family: var(--mono); font-size: .8rem; color: var(--danger); }

/* ═════════════════════ code blocks & diffs ═════════════════════ */

.code-drop {
  margin-top: 1.6rem; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--surface);
  transition: border-color .25s;
}
.code-drop:hover { border-color: var(--border-bright); }
.code-drop summary {
  cursor: pointer; padding: .95rem 1.3rem; font-size: .9rem; font-weight: 550;
  list-style: none; display: flex; align-items: center; gap: .6rem;
}
.code-drop summary::-webkit-details-marker { display: none; }
.code-drop summary::before { content: "▸"; color: var(--accent); font-size: .85rem; transition: transform .25s; }
.code-drop[open] summary::before { transform: rotate(90deg); }
.code-drop summary code { color: var(--accent); }
.code-drop-body { padding: 0 1.3rem 1.35rem; animation: line-in .3s ease-out; }
.code-drop-body p { font-size: .89rem; color: var(--text-mid); margin-bottom: 1rem; max-width: 72ch; }
.code-drop-body code { color: var(--accent); }

pre.code, .diff-pane {
  font-family: var(--mono); font-size: clamp(.7rem, 1.6vw, .81rem); line-height: 1.7;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 1rem 1.15rem; overflow-x: auto; margin: 0; color: var(--text-mid);
}
.diff { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem; }
@media (max-width: 800px) { .diff { grid-template-columns: 1fr; } }

.diff-tag { display: block; font-size: .68rem; text-transform: uppercase; letter-spacing: .07em; color: var(--faint); margin-bottom: .6rem; }
.diff-before { border-color: color-mix(in srgb, var(--danger) 30%, var(--border)); }
.diff-after  { border-color: color-mix(in srgb, var(--ok) 30%, var(--border)); }

.del { color: var(--danger); display: block; }
.add { color: var(--ok); display: block; }
.cmt { color: var(--faint); display: block; }
.kw  { color: var(--cli); }
.fn  { color: var(--accent); }
.ty  { color: var(--resp); }

/* ═══════════════════ runtime / architecture ════════════════════ */

.runtime { padding: clamp(3.5rem, 8vw, 5.5rem) 0; }
.runtime h2 { font-size: clamp(1.7rem, 3.4vw, 2.3rem); margin-bottom: 1rem; }
.section-lede { max-width: 66ch; color: var(--text-mid); }

.arch {
  margin-top: 2.5rem; padding: 1.6rem;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  box-shadow: var(--shadow);
}
/* Below about 640px the diagram would shrink until its labels are
   unreadable, so it scrolls sideways at a legible size instead. */
.arch-scroll { overflow-x: auto; }
.arch svg { width: 100%; min-width: 560px; height: auto; display: block; overflow: visible; }
.arch .a-box { fill: var(--surface-2); stroke: var(--border-bright); }
.arch .a-box.chain { stroke: var(--chain); }
.arch .a-box.resp  { stroke: var(--resp); }
.arch .a-box.cli   { stroke: var(--cli); }
.arch .a-box.hub   { fill: color-mix(in srgb, var(--rust) 12%, var(--surface-2)); stroke: var(--rust); }
.arch .a-label { fill: var(--text); font-family: var(--mono); font-size: 11px; }
.arch .a-sub   { fill: var(--muted); font-family: var(--mono); font-size: 9px; }
.arch .a-wire  { stroke: var(--border-bright); stroke-width: 1.5; fill: none; }
/* Packets run along each wire, standing in for the JSON crossing the boundary. */
.arch .a-packet { fill: var(--rust); }
.arch .a-packet.chain { fill: var(--chain); }
.arch .a-packet.resp  { fill: var(--resp); }
.arch .a-packet.cli   { fill: var(--cli); }

.arch-legend {
  display: flex; flex-wrap: wrap; gap: 1.4rem; margin-top: 1.4rem;
  font-family: var(--mono); font-size: .76rem; color: var(--muted);
}
.arch-legend b { color: var(--text); font-weight: 600; }

/* ═════════════════════ engineering section ═════════════════════ */

.engineering { padding: clamp(3.5rem, 8vw, 6rem) 0; background: color-mix(in srgb, var(--bg-alt) 80%, transparent); }
.engineering h2 { font-size: clamp(1.8rem, 3.6vw, 2.5rem); margin-bottom: 1rem; }

.notes-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(310px, 1fr)); gap: 1.2rem; margin-top: 2.5rem; }
.note {
  position: relative; overflow: hidden;
  background: var(--surface); border: 1px solid var(--border);
  border-top: 3px solid var(--accent); border-radius: var(--radius); padding: 1.5rem;
  transition: transform .3s cubic-bezier(.22,1,.36,1), box-shadow .3s, border-color .3s;
}
.note::after {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  opacity: 0; transition: opacity .35s;
  background: radial-gradient(320px 220px at var(--mx, 50%) var(--my, 0%),
              color-mix(in srgb, var(--accent) 11%, transparent), transparent 70%);
}
.note:hover::after { opacity: 1; }
.note:hover { transform: translateY(-4px); box-shadow: var(--glow); }
.note > * { position: relative; z-index: 1; }
.note[data-accent="chain"] { --accent: var(--chain); }
.note[data-accent="resp"]  { --accent: var(--resp); }
.note[data-accent="cli"]   { --accent: var(--cli); }

.note h3 { font-size: 1.06rem; font-family: var(--mono); }
.note-status {
  font-size: .78rem; color: var(--danger); margin: .35rem 0 1rem;
  font-family: var(--mono); text-transform: uppercase; letter-spacing: .04em;
}
.note-status::before { content: "✕ "; }
.note ul { margin: 0; padding-left: 1.15rem; display: grid; gap: .65rem; }
.note li { font-size: .855rem; color: var(--text-mid); line-height: 1.6; }
.note li::marker { color: var(--accent); }
.note strong { color: var(--text); font-weight: 600; }
.note code { color: var(--accent); font-size: .84em; }
/* Stays a plain block: as a flex container each inline fragment of the
   sentence would become its own flex item and the line would shatter. */
.note-after {
  margin-top: 1.2rem; padding-top: 1rem; border-top: 1px solid var(--border);
  font-size: .845rem; color: var(--ok);
}
.note-after::before { content: "✓ "; }
.note-after code { color: var(--ok); }

.verify { margin-top: 2.5rem; }
.verify h3 { font-size: 1.05rem; margin-bottom: .5rem; }
.verify p { font-size: .89rem; color: var(--muted); margin-bottom: 1rem; }

/* ═══════════════════════════ footer ════════════════════════════ */

.footer { padding: 3.5rem 0 4rem; border-top: 1px solid var(--border); position: relative; }
.footer-inner { display: flex; justify-content: space-between; gap: 2.5rem; flex-wrap: wrap; }
.footer-title { font-weight: 600; margin-bottom: .5rem; display: flex; align-items: center; gap: .6rem; }
.footer-note { font-size: .85rem; color: var(--muted); max-width: 52ch; }
.footer-note code { color: var(--text-mid); }
.footer-links { display: flex; flex-direction: column; gap: .55rem; }
.footer-links a {
  color: var(--muted); text-decoration: none; font-size: .86rem;
  font-family: var(--mono); transition: color .18s, transform .18s;
}
.footer-links a:hover { color: var(--rust); transform: translateX(3px); }

/* Ferris, who waves when you hover him and watches the cursor. */
.ferris { width: 60px; height: 37px; flex-shrink: 0; cursor: pointer; }
.ferris svg { width: 100%; height: 100%; overflow: visible; display: block; }
.ferris .shell { fill: var(--rust); }
.ferris .claw, .ferris .legs path, .ferris .stalk {
  fill: none; stroke: var(--rust); stroke-width: 5;
  stroke-linecap: round; transform-box: view-box;
}
.ferris .legs path, .ferris .stalk { stroke-width: 3.5; }
.ferris .claw-l { transform-origin: 24px 32px; }
.ferris .claw-r { transform-origin: 76px 32px; }
.ferris .eye   { fill: #fbfbfd; }
.ferris .pupil { fill: #17181d; transition: transform .18s ease-out; }
.ferris:hover .claw-l { animation: wave 620ms ease-in-out 2; }
.ferris:hover .claw-r { animation: wave-rev 620ms ease-in-out 2; }
@keyframes wave     { 0%, 100% { transform: rotate(0deg); }  50% { transform: rotate(-24deg); } }
@keyframes wave-rev { 0%, 100% { transform: rotate(0deg); }  50% { transform: rotate(24deg); } }

.footer-meta {
  margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  font-family: var(--mono); font-size: .76rem; color: var(--faint);
}
.footer-meta kbd {
  font-family: var(--mono); font-size: .72rem;
  border: 1px solid var(--border-bright); border-bottom-width: 2px;
  border-radius: 5px; padding: .05rem .35rem; color: var(--text-mid);
  background: var(--surface);
}

/* ═════════════════════ scroll-reveal utility ═══════════════════ */

.reveal { opacity: 0; transform: translateY(18px); }
.reveal.in {
  opacity: 1; transform: none;
  transition: opacity .65s cubic-bezier(.22,1,.36,1), transform .65s cubic-bezier(.22,1,.36,1);
  transition-delay: var(--d, 0ms);
}

[hidden] { display: none !important; }

/* ══════════════════════ motion preferences ═════════════════════
   One place that stands the whole page down: no drifting, turning,
   sweeping or revealing. Content stays exactly where it lands.
   ═════════════════════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .reveal-words .word { opacity: 1; transform: none; }
  #hexfield, .gear { display: none; }
  .marquee-track { animation: none; }
}