/* luad — industrial datasheet aesthetic.
   Warm paper ink on near-black, amber annotation accents, monospace-forward. */

:root {
  /* Brand, sampled from the logo: navy #002A66, moon yellow #FCD866. */
  --navy-900: #04122a;
  --navy-850: #071a38;
  --navy-800: #002a66;
  --navy-700: #0a3a7d;
  --line: #16345e;
  --text: #eaf0f8;
  --dim: #9db1cd;
  --dimmer: #829abb;
  --yellow: #fcd866;
  --yellow-soft: #ffe79c;
  --cyan: #7fd8ea;
  --red: #ff8878;
  --green: #8fe39a;

  --ink: var(--navy-900);
  --panel: var(--navy-850);
  --panel-2: #0a2450;
  --amber: var(--yellow);
  --amber-soft: var(--yellow-soft);

  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --display: "Martian Mono", var(--mono);
  --sans: "IBM Plex Sans", system-ui, sans-serif;

  --measure: 68ch;
  --gutter: clamp(1.25rem, 5vw, 3.5rem);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Atmosphere: fine grain + a faint engineering grid that fades downward. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.028) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.028) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.85), transparent 70%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: .22;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");
}

.wrap { position: relative; z-index: 1; }

a { color: var(--amber-soft); text-underline-offset: .22em; text-decoration-thickness: 1px; }
a:hover { color: var(--amber); }
:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--amber); color: #000; padding: .6rem 1rem;
  font-family: var(--mono); font-weight: 600; z-index: 99;
}
.skip:focus { left: var(--gutter); top: .75rem; }

/* One horizontal gutter for every band of the page. Descendants set vertical
   spacing with padding-block only; a `padding` shorthand here would silently
   reset the inline padding and push content to the viewport edge. */
.shell {
  max-width: 1080px;
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* ---------- masthead ---------- */

.masthead {
  display: flex; flex-wrap: wrap; gap: 1rem;
  align-items: baseline; justify-content: space-between;
  padding-block: 1.5rem 0;
  font-family: var(--mono);
  font-size: .8rem;
  color: var(--dim);
}
.masthead nav { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.masthead a { color: var(--dim); text-decoration: none; }
.masthead a:hover { color: var(--text); }
.tag-ver {
  border: 1px solid var(--line);
  padding: .15rem .5rem;
  border-radius: 999px;
  color: var(--amber);
}

/* ---------- hero ---------- */

.hero { padding-block: clamp(3rem, 9vw, 6.5rem) clamp(2rem, 5vw, 3.5rem); }

.lockup { display: flex; align-items: center; gap: clamp(.75rem, 2.5vw, 1.75rem); }
.lockup img {
  width: clamp(56px, 11vw, 116px);
  height: auto;
  flex: none;
  filter: drop-shadow(0 6px 24px rgba(252,216,102,.18));
}
@media (prefers-reduced-motion: no-preference) {
  .lockup img { animation: rise .8s cubic-bezier(.2,.7,.3,1) .02s backwards; }
}

.wordmark {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(3.5rem, 15vw, 9rem);
  line-height: .86;
  letter-spacing: -.055em;
  margin: 0;
  color: var(--text);
}
.wordmark .dot { color: var(--amber); }

.kicker {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 1.4rem;
}

.lede {
  max-width: var(--measure);
  font-size: clamp(1.1rem, 1rem + .5vw, 1.35rem);
  line-height: 1.55;
  color: var(--text);
  margin: 1.75rem 0 0;
}
.lede .quiet { color: var(--dim); }

.cta { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2.25rem; }
.btn {
  font-family: var(--mono);
  font-size: .875rem;
  font-weight: 500;
  padding: .7rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  text-decoration: none;
  color: var(--text);
  background: var(--panel);
  transition: border-color .18s, background .18s, transform .18s;
}
.btn:hover { border-color: var(--amber); background: var(--panel-2); transform: translateY(-1px); color: var(--text); }
.btn-primary { background: var(--amber); color: #04122a; border-color: var(--amber); font-weight: 600; }
.btn-primary:hover { background: var(--amber-soft); border-color: var(--amber-soft); color: #04122a; }

/* ---------- the hex figure: the argument, made visual ---------- */

.figure {
  margin: clamp(2.5rem, 7vw, 4.5rem) 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: linear-gradient(180deg, var(--panel) 0%, rgba(11,12,14,.6) 100%);
  overflow: hidden;
}
.figure-head {
  display: flex; flex-wrap: wrap; gap: .5rem 1rem;
  align-items: center; justify-content: space-between;
  padding: .85rem 1.15rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--dim);
}
.figure-body { padding: clamp(1.1rem, 4vw, 2rem) clamp(.9rem, 3vw, 2rem); overflow-x: auto; }

.dump { display: grid; gap: 1.5rem; min-width: min-content; }
.dump-row { display: grid; grid-template-columns: 9.5rem 1fr; gap: .9rem; align-items: start; }

.dump-label {
  font-family: var(--mono);
  font-size: .72rem;
  line-height: 1.5;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--dim);
  padding-top: .55rem;
  white-space: nowrap;
}
.dump-label b { display: block; color: var(--text); font-weight: 600; letter-spacing: .04em; text-transform: none; font-size: .82rem; }

.bytes { display: flex; gap: .3rem; flex-wrap: nowrap; }

.byte {
  position: relative;
  font-family: var(--mono);
  font-size: clamp(.78rem, .7rem + .35vw, 1rem);
  font-weight: 500;
  padding: .45rem .38rem;
  min-width: 2.35em;
  text-align: center;
  color: var(--dim);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: help;
  transition: color .15s, background .15s, border-color .15s;
}
.byte:hover, .byte:focus-visible { color: var(--text); background: rgba(255,255,255,.05); border-color: var(--line); }

.byte[data-key="magic"] { color: var(--dimmer); }
.byte[data-key="diff"] {
  color: #04122a;
  background: var(--amber);
  border-color: var(--amber);
  font-weight: 700;
}
.byte[data-key="diff"]:hover, .byte[data-key="diff"]:focus-visible { background: var(--amber-soft); border-color: var(--amber-soft); color: #04122a; }

/* tooltip */
.byte[data-field]::after {
  content: attr(data-field);
  position: absolute;
  bottom: calc(100% + .45rem);
  left: 50%;
  transform: translateX(-50%) translateY(3px);
  background: #000;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: .3rem .55rem;
  font-size: .68rem;
  font-family: var(--mono);
  letter-spacing: .02em;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s, transform .15s;
  z-index: 5;
}
.byte:hover::after, .byte:focus-visible::after { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 620px) {
  .dump-row { grid-template-columns: 1fr; gap: .35rem; }
  .dump-label { padding-top: 0; }
}

.figure-note {
  border-top: 1px solid var(--line);
  padding: 1rem 1.15rem;
  font-size: .92rem;
  color: var(--dim);
  margin: 0;
}
.figure-note strong { color: var(--amber); font-weight: 600; }

/* ---------- sections ---------- */

section { padding-block: clamp(2.5rem, 7vw, 4.5rem); }
section + section { border-top: 1px solid var(--line); }

h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.45rem, 1.2rem + 1.1vw, 2.1rem);
  letter-spacing: -.03em;
  line-height: 1.15;
  margin: 0 0 1.25rem;
}
h3 {
  font-family: var(--mono);
  font-size: .8rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 2rem 0 .75rem;
}
p { max-width: var(--measure); }
.dim { color: var(--dim); }

/* ---------- code ---------- */

pre {
  font-family: var(--mono);
  font-size: clamp(.76rem, .7rem + .3vw, .875rem);
  line-height: 1.7;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  margin: 1.25rem 0;
  color: var(--text);
}
pre .c { color: var(--dimmer); }
pre .p { color: var(--amber); }
pre .k { color: var(--cyan); }
pre .e { color: var(--red); }
code { font-family: var(--mono); font-size: .92em; }
p code, li code, td code {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: .08em .35em;
  color: var(--amber-soft);
}

/* ---------- tables ---------- */

.table-scroll { overflow-x: auto; margin: 1.5rem 0; }
table {
  border-collapse: collapse;
  width: 100%;
  font-size: .9rem;
  min-width: 34rem;
}
th, td {
  text-align: left;
  padding: .7rem .8rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--dim);
  font-weight: 500;
  border-bottom-color: var(--dimmer);
}
td:first-child { font-family: var(--mono); color: var(--amber-soft); white-space: nowrap; }
.warn { color: var(--red); font-weight: 600; }
.ok { color: var(--green); }

/* ---------- honesty callout ---------- */

.callout {
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  background: var(--panel);
  border-radius: 0 4px 4px 0;
  padding: 1.15rem 1.35rem;
  margin: 1.5rem 0;
}
.callout p:last-child { margin-bottom: 0; }
.callout p:first-child { margin-top: 0; }

/* ---------- credit grid ---------- */

.credits { display: grid; gap: 1.5rem 2rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); margin-top: 1.5rem; }
.credit h4 {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text);
  margin: 0 0 .4rem;
}
.credit p { font-size: .9rem; color: var(--dim); margin: 0; max-width: none; }

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--line);
  padding-block: 2.5rem 3.5rem;
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--dimmer);
}
footer a { color: var(--dim); }
footer p { max-width: none; }

/* ---------- entrance ---------- */

@media (prefers-reduced-motion: no-preference) {
  .rise { opacity: 0; transform: translateY(14px); animation: rise .7s cubic-bezier(.2,.7,.3,1) forwards; }
  .rise:nth-child(1) { animation-delay: .05s; }
  .rise:nth-child(2) { animation-delay: .13s; }
  .rise:nth-child(3) { animation-delay: .21s; }
  .rise:nth-child(4) { animation-delay: .29s; }
  .byte { animation: byteIn .45s backwards; }
  @keyframes byteIn { from { opacity: 0; transform: translateY(-5px); } }
}
@keyframes rise { to { opacity: 1; transform: none; } }