:root {
  --navy: #0d1624;
  --navy-2: #152236;
  --slab: #c8c2b6;
  --zinc: #9aa3ab;
  --lock: #d4a017;
  --lock-2: #f0c44a;
  --ink: #121820;
  --mute: #5c6570;
  --vac: #dfe4e8;
  --del: #8a3a22;
  --occ: #1c2a3d;
  --display: "Oswald", "Noto Sans SC", sans-serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 72px; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--slab);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link { color: #8a6a10; text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); background: rgba(212, 160, 23, 0.2); padding: 0.05em 0.35em; }

.zinc {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 8;
  opacity: 0.16;
  background-image: url("images/texture.webp");
  background-size: 240px auto;
  mix-blend-mode: multiply;
}

.skip { position: absolute; left: -999px; }
.skip:focus { left: 10px; top: 10px; z-index: 80; background: var(--lock); padding: 8px; }

.slab {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 20px;
  background: rgba(13, 22, 36, 0.94);
  color: var(--slab);
  border-bottom: 3px solid var(--lock);
}
.brand { font-family: var(--display); letter-spacing: 0.06em; font-size: 22px; }
.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--lock);
  font-weight: 400;
}
.nav-toggle {
  display: none;
  background: var(--lock);
  color: var(--navy);
  border: 0;
  padding: 8px 12px;
  font-weight: 700;
}
.door-nav { display: flex; gap: 14px; align-items: center; font-size: 13px; }
.door-nav a { color: var(--zinc); }
.door-nav a.is-active, .door-nav a:hover { color: var(--lock-2); }
.door-nav a.live { background: var(--lock); color: var(--navy); padding: 7px 12px; font-weight: 700; }

.facade {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  min-height: calc(100vh - 56px);
  background: var(--navy);
  color: var(--slab);
}
.doors {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 28px;
}
.door {
  min-height: 18vh;
  border: 2px solid #6d7782;
  background:
    repeating-linear-gradient(180deg, #8b959e 0 8px, #7a848e 8px 10px);
  color: #0d1624;
  font-family: var(--display);
  letter-spacing: 0.08em;
  font-size: 18px;
  text-align: left;
  padding: 12px;
  box-shadow: inset 0 8px 0 rgba(255,255,255,0.12);
}
.door small { display: block; font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em; margin-top: 6px; }
.door.occ { filter: brightness(0.72); color: var(--lock-2); }
.door.vac { filter: brightness(1.08); }
.door.del { background: repeating-linear-gradient(180deg, #6a3a2c 0 8px, #5a3026 8px 10px); color: var(--lock-2); }
.door.turn { outline: 2px dashed var(--lock); }
.door.hold { opacity: 0.85; }
.door.on { box-shadow: inset 0 8px 0 rgba(255,255,255,0.12), 0 0 0 3px var(--lock); }

.facade-copy { padding: 8vh 5vw 8vh 2vw; }
.kicker {
  font-family: var(--mono);
  letter-spacing: 0.16em;
  font-size: 11px;
  color: var(--lock);
  margin: 0 0 12px;
}
h1, h2, h3 { font-family: var(--display); margin: 0 0 14px; line-height: 1.08; letter-spacing: 0.02em; }
h1 { font-size: clamp(34px, 5.4vw, 64px); }
h2 { font-size: clamp(26px, 3.2vw, 40px); }
h3 { font-size: 22px; }
.lead { max-width: 42em; }
.quiet { color: var(--mute); max-width: 46em; }
.door-msg {
  margin: 18px 0;
  padding: 12px 14px;
  border-left: 4px solid var(--lock);
  background: rgba(212, 160, 23, 0.08);
  font-size: 14px;
}
.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; padding: 10px 14px; border: 2px solid currentColor; font-weight: 700; }
.btn.fill { background: var(--lock); color: var(--navy); border-color: var(--lock); }
.btn.ghost { color: var(--slab); }

.bay { width: min(1100px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0; }
.navy { background: var(--navy); color: var(--slab); }
.navy .quiet, .navy .kicker { color: var(--lock-2); }
.navy .app-link { color: var(--lock-2); }
.navy code { color: var(--slab); }

.tri { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 28px; }
.tri article, .grid6 article, .grid3 article, .io > div {
  background: #ece7dc;
  border: 1px solid rgba(13, 22, 36, 0.16);
  padding: 16px;
}
.tri .chalk { background: #e7d9a8; }
.tri ul, .io ul, .bound { margin: 0; padding-left: 1.1em; }
.tri li, .io li, .bound li { margin: 0 0 6px; }

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: center;
  margin: 32px 0;
}
.row.rev { direction: rtl; }
.row.rev > * { direction: ltr; }
.num { font-family: var(--mono); color: var(--lock); letter-spacing: 0.12em; font-size: 12px; }
.row figure { margin: 0; }
.row img { border: 3px solid var(--lock); }
.row figcaption { margin-top: 8px; font-size: 13px; color: var(--zinc); }

.slider { display: flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: 12px; }
.slider input { flex: 1; accent-color: var(--lock); }
.tension { margin: 8px 0 0; font-size: 14px; color: var(--lock-2); }
.lock-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.lock-btns button {
  background: transparent;
  color: var(--lock-2);
  border: 2px solid var(--lock);
  padding: 8px 10px;
  font-family: var(--display);
  letter-spacing: 0.08em;
}
.lock-btns button.on { background: var(--lock); color: var(--navy); }

.grid6 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 28px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 28px; }
.navy .grid3 article, .navy .io > div { background: var(--navy-2); color: var(--slab); }
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 24px; }
.bound { max-width: 46em; }

footer {
  padding: 18px 22px 36px;
  background: var(--navy);
  color: var(--zinc);
  font-family: var(--mono);
  font-size: 12px;
  border-top: 3px solid var(--lock);
}

@media (max-width: 900px) {
  .facade, .tri, .row, .row.rev, .grid6, .grid3, .io { grid-template-columns: 1fr; }
  .row.rev { direction: ltr; }
  .doors { grid-template-columns: repeat(3, 1fr); }
  .door { min-height: 12vh; font-size: 14px; }
  .nav-toggle { display: inline-block; }
  .door-nav {
    display: none;
    position: absolute;
    right: 10px;
    top: 52px;
    flex-direction: column;
    background: var(--navy);
    border: 2px solid var(--lock);
    padding: 10px;
    min-width: 180px;
  }
  .door-nav.open { display: flex; }
}