/* sub pages (placeholders for now) in the home page's dark look. Used two ways: as a page of its own
   (<body class="subpage">) and as the panel the home page opens over itself once a tag has zoomed in
   (div.subpage), so going back never reloads the home page. --light is the colour the zoomed screen
   ended on (now the dark ground itself): the page arrives in it and turns back into it when it closes. */
.subpage {
  --bg: #0b0b0c;
  --panel: #151517;
  --line: #2c2c30;
  --text: #e6e4df;
  --signal: #ff6a2b;
  --edge: clamp(20px, calc(16vw - 60px), 220px); /* content kept towards the middle */
  --edge-y: clamp(16px, calc(7vh - 14px), 64px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --mono: "DM Mono", ui-monospace, Menlo, Consolas, monospace;
  --light: var(--bg);
  position: fixed;
  inset: 0;
  z-index: 30;
  margin: 0;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: "DM Sans", sans-serif;
}
.subpage ::selection {
  background: var(--signal);
  color: var(--bg);
}
/* the same faint dot grid as the home page, fading out towards the edges */
.subpage::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(230, 228, 223, 0.08) 1px, transparent 1.4px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 50%, #000 30%, transparent 78%);
  mask-image: radial-gradient(ellipse at 50% 50%, #000 30%, transparent 78%);
  pointer-events: none;
}
/* arrival: the flat screen colour the zoom ended on, clearing to the dark page */
.subpage::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  background: var(--light);
  pointer-events: none;
  animation: sub-clear 0.7s var(--ease) both;
}
.subpage.instant::before {
  animation: none;
  opacity: 0;
}
/* closing: back into the screen colour, then the tag flies back on the home page */
.subpage.leaving::before {
  animation: sub-cover 0.25s ease-in both;
}
@keyframes sub-clear {
  to { opacity: 0; }
}
@keyframes sub-cover {
  from { opacity: 0; }
}
.subpage .screen {
  position: relative;
  z-index: 1;
  height: 100%;
  box-sizing: border-box;
  padding: var(--edge-y) var(--edge);
  display: flex;
  flex-direction: column;
}
/* the iameric wordmark, exactly where it sits on the home page; it leads back home */
.subpage .sub-mark {
  align-self: flex-start;
  font-family: "Unbounded", var(--mono);
  font-weight: 600;
  font-size: clamp(19px, 1.6vw, 27px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--signal);
  text-decoration: none;
  border-radius: 4px;
}
.subpage .sub-mark:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 4px;
}
/* hovering (or focusing) the wordmark swaps it for "<- back", the way the home page's intro
   brings the wordmark in: a soft edge sweeps from left to right, the word blurs away behind it and
   "back" sharpens in, dark on a block of the accent colour that closes with the letters (0.1em and
   0.77em are Unbounded's measures, like the links in links.css). Both sit in one grid cell; the padding gives the blur room inside
   the mask (a mask clips at the element's box) */
@property --sweep {
  syntax: "<percentage>";
  inherits: true;
  initial-value: -40%;
}
.subpage .sub-mark {
  display: inline-grid;
  --sweep: -40%;
  transition: --sweep 0.7s var(--ease);
}
.subpage .sub-mark:hover,
.subpage .sub-mark:focus-visible {
  --sweep: 100%;
}
.subpage .sub-mark > span {
  grid-area: 1 / 1;
  padding: 14px 20px;
  margin: -14px -20px;
  transition: filter 0.7s var(--ease);
}
.subpage .sub-mark .mark-word {
  -webkit-mask-image: linear-gradient(90deg, transparent var(--sweep), #000 calc(var(--sweep) + 40%));
  mask-image: linear-gradient(90deg, transparent var(--sweep), #000 calc(var(--sweep) + 40%));
}
/* arrival: the wordmark comes in like the home page's intro, a soft edge sweeping from left to right while
   the letters sharpen. A second mask layer, intersected with the hover sweep above; it only fills
   backwards, so once it has run the hover's blur and sweep work as before */
@property --intro {
  syntax: "<percentage>";
  inherits: false;
  initial-value: 100%;
}
@media (prefers-reduced-motion: no-preference) {
  .subpage .sub-mark .mark-word {
    -webkit-mask-image: linear-gradient(90deg, transparent var(--sweep), #000 calc(var(--sweep) + 40%)), linear-gradient(90deg, #000 var(--intro), transparent calc(var(--intro) + 40%));
    mask-image: linear-gradient(90deg, transparent var(--sweep), #000 calc(var(--sweep) + 40%)), linear-gradient(90deg, #000 var(--intro), transparent calc(var(--intro) + 40%));
    -webkit-mask-composite: source-in;
    mask-composite: intersect;
    animation: mark-intro 1.9s var(--ease) 0.5s backwards;
  }
}
@keyframes mark-intro {
  from { --intro: -40%; filter: blur(8px); }
}
.subpage .sub-mark .mark-back {
  display: inline-flex;
  align-items: center;
  gap: 0.15em;
  padding-inline: calc(20px + 0.2em);
  color: transparent;
  background-image: linear-gradient(var(--bg) calc(14px + 0.87em), var(--signal) 0), linear-gradient(var(--signal), var(--signal));
  background-position: 0 0, 50% calc(14px + 0.1em);
  background-size: 100% 100%, calc(100% - 40px) 0.77em;
  background-repeat: no-repeat;
  -webkit-background-clip: text, border-box;
  background-clip: text, border-box;
  filter: blur(8px);
  -webkit-mask-image: linear-gradient(90deg, #000 var(--sweep), transparent calc(var(--sweep) + 40%));
  mask-image: linear-gradient(90deg, #000 var(--sweep), transparent calc(var(--sweep) + 40%));
}
.subpage .sub-mark .mark-back .material-symbols-outlined {
  font-size: 1.05em;
  margin-block: -1em; /* taller than the letters: it must not move them off the block */
}
.subpage .sub-mark:hover .mark-word,
.subpage .sub-mark:focus-visible .mark-word {
  filter: blur(8px);
}
.subpage .sub-mark:hover .mark-back,
.subpage .sub-mark:focus-visible .mark-back {
  filter: none;
}
.subpage h1 {
  margin: clamp(28px, 7vh, 72px) 0 0;
  font-weight: 500;
  font-size: var(--title, 20vw);
  line-height: 0.9;
  letter-spacing: -0.04em;
  white-space: nowrap;
  outline: none;
}
.subpage .note {
  margin: auto 0 16px;
  font: 12px var(--mono);
  letter-spacing: 0.02em;
  opacity: 0.62;
}
/* a footer in the bottom right corner: copyright and the legal notice */
.subpage .sub-foot {
  align-self: flex-end;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 20px;
  font: 14px/1 "DM Sans", sans-serif;
}
.subpage .sub-foot p {
  margin: 0;
  color: color-mix(in srgb, var(--text) 62%, transparent);
}
@media (prefers-reduced-motion: reduce) {
  .subpage::before { animation: none; }
  .subpage::before { opacity: 0; }
}