/* ACE landing — Phosphor Terminal world
 * Direction contract: .impeccable/surfaces/experiments-exp-007-ace-site-index-html.md
 * One monospaced voice in an 80-column field on curved glass. Bright phosphor
 * is reserved for live and actionable elements; dim phosphor reads; hairline
 * green rules are the visible armature. Motion is driven from app.js (Motion
 * v14, vendored) — CSS never transitions transform/opacity on animated nodes.
 */

:root {
  --bg: #0a0f0a;
  --bg-deep: #060906;
  --ink: #33ff66;         /* live / actionable — 14:1 on bg */
  --read: #6ccf95;        /* reading text — ~9:1 on bg */
  --dim: #4aab73;         /* secondary — ~6.5:1 on bg */
  --line: #1c4432;        /* hairline armature, never text */
  --hot: #d9ffe6;         /* bloom-white of the live line */
  --scan: rgba(0, 0, 0, 0.24);
  --sheet: 84ch;
  --rail-w: 15ch;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--read);
  font: 16px/1.65 ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--ink); color: var(--bg); }
body { caret-color: var(--ink); }

/* themed browser surfaces */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--line); border: 2px solid var(--bg-deep); }
::-webkit-scrollbar-thumb:hover { background: var(--dim); }
html { scrollbar-color: var(--line) var(--bg-deep); scrollbar-width: thin; }

a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--hot); }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

code, pre { font: inherit; }

/* ---------- CRT material (world texture) ---------- */
.crt {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  background:
    repeating-linear-gradient(0deg, var(--scan) 0 1px, transparent 1px 3px),
    radial-gradient(130% 105% at 50% 45%, transparent 55%, rgba(0, 0, 0, 0.55) 100%);
}

/* ---------- left rail: history position ---------- */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 2.2rem 0.8rem;
  border-right: 1px solid var(--line);
  background: var(--bg-deep);
  font-size: 13px;
  z-index: 40;
}

.rail a {
  color: var(--dim);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rail a::before { content: "  "; white-space: pre; }
.rail a.active { color: var(--ink); }
.rail a.active::before { content: "> "; color: var(--ink); }
.rail a:hover { color: var(--hot); }

/* ---------- sheet ---------- */
.sheet {
  margin-left: var(--rail-w);
  max-width: var(--sheet);
  padding: 4.5rem clamp(1rem, 4vw, 3.5rem) 0;
}

/* ---------- hero ---------- */
#hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-bottom: 3rem;
}

.boot {
  color: var(--dim);
  font-size: 13px;
  margin: 0 0 2.2rem;
}

.claim {
  margin: 0 0 1.6rem;
  color: var(--ink);
  font-size: clamp(1.05rem, 5.3vw, 5rem);   /* longest line is 14ch — fits the 80-col sheet at every width */
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.03em;
  text-shadow: 0 0 10px rgba(51, 255, 102, 0.35);
}

.claim .c-line { display: block; width: max-content; white-space: nowrap; overflow: hidden; }

.lead {
  max-width: 72ch;
  margin: 0 0 2.6rem;
  color: var(--read);
}
.lead em { font-style: normal; color: var(--ink); }

.action-line {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  max-width: 78ch;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  background: var(--bg-deep);
}

.action-line .prompt { color: var(--ink); }

.action-line code {
  flex: 1 1 30ch;
  color: var(--hot);
  overflow-x: auto;
  white-space: nowrap;
}

.status-print {
  margin: 0;
  color: var(--dim);
  font-size: 13px;
}

/* trust chips — bracketed status tokens under the claim */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-width: 78ch;
  margin: 1.8rem 0 0.8rem;
}

.chip {
  border: 1px solid var(--line);
  background: var(--bg-deep);
  color: var(--dim);
  font-size: 13px;
  padding: 0.22rem 0.65rem;
  white-space: nowrap;
}
.chip::before { content: "[ "; }
.chip::after { content: " ]"; }
.chip.live { border-color: var(--ink); color: var(--ink); }
a.chip { text-decoration: none; }
a.chip:hover, a.chip:focus-visible { border-color: var(--hot); color: var(--hot); }

.cursor-row { margin: 1.2rem 0 0; height: 1.4em; }

.cursor {
  display: inline-block;
  width: 0.62em;
  height: 1.15em;
  background: var(--ink);
  vertical-align: text-bottom;
  box-shadow: 0 0 8px rgba(51, 255, 102, 0.6);
  animation: blink 1.06s steps(2, start) infinite;
}

@keyframes blink { to { visibility: hidden; } }

/* ---------- sections ---------- */
.band {
  padding: 5.5rem 0 1rem;
  border-top: 1px solid var(--line);
}

.band > .cmd {
  margin: 0 0 2.4rem;    /* heading sits close to its content, far from what precedes it */
  color: var(--ink);
  font-size: clamp(1.25rem, 2.6vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  overflow-x: auto;
  white-space: nowrap;
}

.read, .fine, .note { max-width: 72ch; }
.read { color: var(--read); margin: 0 0 2rem; }
.fine { color: var(--dim); font-size: 14px; margin: 1.4rem 0 0; }
.fine code { color: var(--read); }
.note { color: var(--dim); font-size: 12.5px; margin: 0 0 1rem; }

/* transcript blocks */
.transcript { max-width: 80ch; margin: 0 0 1.4rem; }

.transcript p {
  margin: 0;
  padding: 0.18em 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-variant-numeric: tabular-nums;
}

.transcript .t-line { color: var(--hot); }
.transcript .t-line::before { content: "$ "; color: var(--ink); }
.transcript .out { color: var(--dim); padding-left: 1.6ch; }

/* afterimage: a printed line's phosphor ghost sweeps off behind it */
.transcript .out.printed { animation: afterimage 0.6s ease-out 1 both; }

@keyframes afterimage {
  from { text-shadow: -10px 0 8px rgba(51, 255, 102, 0.5); }
  to { text-shadow: 0 0 0 rgba(51, 255, 102, 0); }
}

.replay {
  appearance: none;
  font: inherit;
  font-size: 13px;
  color: var(--dim);
  background: transparent;
  border: 1px solid var(--line);
  padding: 0.45rem 0.9rem;
  cursor: pointer;
}
.replay:hover { color: var(--bg); background: var(--ink); border-color: var(--ink); }

/* label grid — spec rows ruled like a stock label */
.label-grid {
  max-width: 78ch;
  margin: 0 0 2.6rem;
  border-top: 1px solid var(--line);
}

.label-grid .row {
  display: grid;
  grid-template-columns: 14ch 1fr;
  gap: 1ch;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--line);
}

.label-grid dt { color: var(--dim); margin: 0; }
.label-grid dd { color: var(--read); margin: 0; overflow-wrap: anywhere; }

/* code blocks */
.code-block {
  max-width: 80ch;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--bg-deep);
}

.code-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1ch;
  padding: 0.5rem 0.9rem;
  border-bottom: 1px solid var(--line);
  color: var(--dim);
  font-size: 13px;
}

.code-block pre {
  margin: 0;
  padding: 1rem 0.9rem;
  overflow-x: auto;
  color: var(--read);
  font-size: 14px;
  line-height: 1.6;
}

/* copy — bright ink means actionable */
.copy {
  appearance: none;
  font: inherit;
  font-size: 13px;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  padding: 0.2rem 0.7rem;
  cursor: pointer;
  white-space: nowrap;
}
.copy:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.copy[data-state="copied"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* cli rows */
.rows { max-width: 80ch; border-top: 1px solid var(--line); }

.rows .row {
  display: grid;
  grid-template-columns: minmax(24ch, 34ch) 1fr;
  gap: 1.5ch;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
}

.rows .row code { color: var(--hot); }
.rows .row span { color: var(--dim); }

/* close / checkout honesty */
.sponsor {
  display: inline-block;
  margin: 1.5rem 0 0.5rem;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--ink);
  color: var(--bg);
  background: var(--ink);
  text-decoration: none;
  font-weight: 700;
}
.sponsor:hover { background: var(--hot); border-color: var(--hot); color: var(--bg); }

.checkout-state {
  max-width: 60ch;
  margin: 0 0 1.5rem;
  color: var(--dim);
  font-size: 14px;
}

/* pricing receipt — the free tier stated as numbers, nothing invented */
.receipt {
  max-width: 64ch;
  margin: 1.8rem 0 0;
  border: 1px solid var(--line);
  background: var(--bg-deep);
}

.receipt .r-head {
  margin: 0;
  padding: 0.5rem 0.9rem;
  border-bottom: 1px solid var(--line);
  color: var(--dim);
  font-size: 13px;
}

.receipt .r-row {
  display: flex;
  justify-content: space-between;
  gap: 1ch;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--line);
  color: var(--read);
  font-variant-numeric: tabular-nums;
}
.receipt .r-row b { color: var(--hot); font-weight: 700; }
.receipt .r-row.total { color: var(--ink); }
.receipt .r-row.total b { color: var(--ink); }

/* docs cards — where to go next */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(26ch, 1fr));
  gap: 0.9rem;
  max-width: 84ch;
  margin: 2.2rem 0 0;
}

.card {
  display: block;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  background: var(--bg-deep);
  text-decoration: none;
}
.card:hover, .card:focus-visible { border-color: var(--ink); }
.card .c-t { display: block; margin: 0 0 0.25rem; color: var(--ink); font-weight: 700; }
.card:hover .c-t { color: var(--hot); }
.card .c-d { display: block; margin: 0; color: var(--dim); font-size: 13.5px; line-height: 1.5; }

footer .foot-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18ch, 1fr));
  gap: 1.6rem 2rem;
  max-width: 84ch;
  margin: 0 0 1.8rem;
}

footer h4 {
  margin: 0 0 0.55rem;
  color: var(--dim);
  font-size: 13px;
  font-weight: 400;
}

footer ul { margin: 0; padding: 0; list-style: none; }
footer li { margin: 0 0 0.35rem; }
footer .foot-cols a {
  color: var(--read);
  text-decoration: none;
  font-size: 14px;
}
footer .foot-cols a:hover { color: var(--hot); text-decoration: underline; }

footer {
  margin: 4.5rem 0 0;
  padding: 1.6rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 13px;
}
footer .cursor { width: 0.55em; height: 1em; }

[hidden] { display: none !important; }

/* ---------- narrow screens: rail becomes a top history bar ---------- */
@media (max-width: 900px) {
  .rail {
    position: sticky;
    top: 0;
    left: auto;
    bottom: auto;
    width: 100%;
    flex-direction: row;
    gap: 1.2rem;
    padding: 0.7rem 1rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    overflow-x: auto;
  }
  .sheet { margin-left: 0; padding-top: 2.5rem; }
  #hero { min-height: auto; padding: 3rem 0 2.5rem; }
  .band { padding-top: 4rem; }
  .label-grid .row { grid-template-columns: 1fr; gap: 0.1rem; }
  .rows .row { grid-template-columns: 1fr; gap: 0.15rem; }
}

/* ---------- reduced motion: everything is already final ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cursor { animation: none; }
  .transcript .out.printed { animation: none; }
}