/* ──────────────────────────────────────────────────────────
   Drift Off Abstractions — abstractions.4dhb.net
   Built from the cover: a black frame around a submerged,
   solarised image; no type on the image but the mark.
   The whole page keeps that frame. Everything sits inside it.
   ────────────────────────────────────────────────────────── */

:root {
  color-scheme: dark;
  --black:  #060606;
  --frame:  #000000;
  --ink:    #cfc9ba;      /* cream, pulled down */
  --dim:    #76726a;
  --rule:   #1c1c1a;
  --moss:   #3f7a52;      /* the green under the bars */
  --rust:   #8a3a22;
  --violet: #4b2e78;
  --display: 'Manrope', 'Helvetica Neue', Arial, sans-serif;
  --mono:    'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --edge:   clamp(14px, 2.4vw, 36px);   /* the cover's black border */
  --gutter: clamp(16px, 4vw, 56px);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--frame);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: .02em;
  overflow-x: hidden;
  padding: var(--edge);   /* the frame */
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
:focus-visible { outline: 1px solid var(--ink); outline-offset: 4px; }

.page { background: var(--black); min-height: calc(100vh - 2 * var(--edge)); }

.label { font-family: var(--mono); font-size: 10px; letter-spacing: .22em; text-transform: uppercase; color: var(--dim); }
.serif { font-family: var(--display); font-weight: 300; letter-spacing: .04em; text-transform: uppercase; }
.serif i, i.serif { font-style: normal; }

/* ── Header: a thin black bar inside the frame ── */
.top {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  min-height: 56px; padding: 0 var(--gutter);
  background: var(--black); border-bottom: 1px solid var(--rule);
}
.top-left { display: flex; align-items: center; gap: 18px; min-width: 0; }
.menu-btn { display: block; line-height: 0; padding: 6px 14px 6px 0; border-right: 1px solid var(--rule); }
.menu-btn svg { display: block; width: 40px; height: auto; color: var(--ink); transition: color .2s; }
.menu-btn:hover svg { color: #fff; }
.top .title { font-size: 10px; letter-spacing: .22em; text-transform: uppercase; color: var(--ink); white-space: nowrap; }
.top nav { display: flex; gap: clamp(14px, 2vw, 28px); }
.top nav a { font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--dim); padding: 6px 0; transition: color .2s; }
.top nav a:hover { color: var(--ink); }

/* ── Cover: the image, held in the dark, nothing on it ── */
.cover { position: relative; display: grid; place-items: center; padding: clamp(24px, 5vw, 72px) var(--gutter); }
.cover img {
  width: min(100%, 72vh, 900px); height: auto; aspect-ratio: 1844 / 1824;
  box-shadow: 0 40px 120px rgba(0,0,0,.8);
}
/* The cover's own 4D·HB sits inside the artwork, so the page mark goes under it, small, as a signature. */
.cover-sig { margin-top: 22px; display: flex; align-items: baseline; justify-content: space-between; gap: 16px; width: min(100%, 72vh, 900px); }
.cover-sig .serif { font-size: clamp(18px, 2.4vw, 30px); line-height: 1; }

/* ── Tracks: two long forms ── */
section { padding: clamp(48px, 7vw, 96px) var(--gutter); border-top: 1px solid var(--rule); }
.sec-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: clamp(28px, 4vw, 48px); }
.tracks { list-style: none; }
.track { padding: 0; border-top: 1px solid var(--rule); position: relative; overflow: hidden; isolation: isolate; }
.track .play {
  display: grid; grid-template-columns: 48px 1fr auto; gap: 0 24px; align-items: baseline; width: 100%; text-align: left;
  padding: clamp(22px, 3vw, 36px) 0; color: inherit;
}
.track .hint { font-size: 10px; letter-spacing: .22em; text-transform: uppercase; color: var(--dim); }
.track .hint::before { content: 'Preview'; }
.track .n { transition: color .2s; position: relative; }
.track .ico { display: none; }
.track:not(.is-unlinked) .play:hover .num, .track.is-playing .num { display: none; }
.track:not(.is-unlinked) .play:hover .ico { display: inline-block; width: 0; height: 0; border-style: solid; border-width: 5px 0 5px 9px; border-color: transparent transparent transparent var(--moss); vertical-align: baseline; }
.track.is-playing .ico { display: inline-block; width: 8px; height: 8px; border: 0; background: var(--moss); }
.track:not(.is-unlinked) .play:hover .n, .track.is-playing .n, .track.is-playing .hint { color: var(--moss); }
/* the fill: moss rising across the row as the preview runs */
.track::before { content: ''; position: absolute; inset: 0; width: calc(var(--prog, 0) * 100%); background: var(--moss); opacity: .16; z-index: -1; pointer-events: none; }
@media (prefers-reduced-motion: no-preference) { .track::before { transition: width .25s linear; } }
.track.is-playing .hint { font-size: 0; }
.track.is-playing .hint::before { content: 'Playing · press to stop'; font-size: 10px; }
.track .hint { min-height: 1em; }
.track.is-unlinked .play { cursor: default; }
.track.is-unlinked .hint { visibility: hidden; }
.track:last-child { border-bottom: 1px solid var(--rule); }
.track .n { font-size: 10px; letter-spacing: .2em; color: var(--dim); }
.track h3 { font-family: var(--display); font-weight: 200; font-size: clamp(30px, 5.6vw, 76px); line-height: 1; letter-spacing: .06em; text-transform: uppercase; color: var(--ink); }
.track .dur { font-size: 11px; letter-spacing: .16em; color: var(--dim); font-variant-numeric: tabular-nums; }
/* bars: the cover's black slats, as a hover */
.track::after {
  content: ''; position: absolute; left: 0; right: 0; top: 0; height: 100%; pointer-events: none; opacity: 0;
  background: repeating-linear-gradient(170deg, transparent 0 46px, rgba(0,0,0,.55) 46px 58px);
  transition: opacity .35s;
}
.track:hover::after { opacity: 1; }
.track > * { position: relative; z-index: 1; }

/* ── Facts ── */
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0 32px; max-width: 900px; }
.facts div { padding: 14px 0; border-top: 1px solid var(--rule); }
.facts dt { font-size: 10px; letter-spacing: .22em; text-transform: uppercase; color: var(--dim); }
.facts dd { font-family: var(--display); font-weight: 300; font-size: 18px; letter-spacing: .04em; text-transform: uppercase; line-height: 1.3; margin-top: 4px; color: var(--ink); }

/* ── Listen ── */
.services { display: flex; flex-wrap: wrap; gap: 12px; }
.svc {
  display: flex; flex-direction: column; gap: 4px; min-width: 220px; padding: 20px 22px;
  border: 1px solid var(--rule); color: var(--ink); transition: border-color .2s, background .2s;
}
.svc strong { font-family: var(--display); font-weight: 300; font-size: 18px; letter-spacing: .06em; text-transform: uppercase; line-height: 1; }
.svc span { font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--dim); }
.svc:hover { border-color: var(--moss); background: rgba(63,122,82,.08); }

/* ── Stay close ── */
.signup { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px 12px; max-width: 560px; }
.signup input { min-width: 0; font: inherit; font-size: 14px; letter-spacing: .04em; padding: 12px 14px; border: 1px solid var(--rule); background: transparent; color: var(--ink); }
.signup input::placeholder { color: var(--dim); }
.signup input:focus { outline: 1px solid var(--moss); outline-offset: 2px; border-color: var(--moss); }
.signup button { font: inherit; font-size: 10px; letter-spacing: .22em; text-transform: uppercase; padding: 12px 18px; border: 1px solid var(--ink); color: var(--ink); transition: background .2s, color .2s, border-color .2s; }
.signup button:hover { background: var(--moss); border-color: var(--moss); color: var(--black); }
.signup-msg { grid-column: 1 / -1; font-size: 10px; letter-spacing: .22em; text-transform: uppercase; color: var(--dim); }
@media (max-width: 520px) { .signup { grid-template-columns: 1fr; } }

/* ── Footer ── */
footer { padding: 28px var(--gutter) 40px; border-top: 1px solid var(--rule); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px 32px; font-size: 10px; letter-spacing: .14em; text-transform: uppercase; color: var(--dim); }
footer a:hover { color: var(--ink); }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (max-width: 720px) {
  .top nav a.ext { display: none; }
  .top .title { font-size: 9px; letter-spacing: .16em; }
  .track .play { grid-template-columns: 36px 1fr; }
  .track .hint { grid-column: 2; margin-top: 10px; }
  .cover-sig { flex-direction: column; gap: 8px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; } }