:root {
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --grotesk: "Space Grotesk", system-ui, sans-serif;
  --display: "Unbounded", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #07070c;
  color: #fff;
}

canvas { display: block; }

#stage { position: fixed; inset: 0; }
#stage canvas { position: absolute; inset: 0; }

#links {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
}

/* Every link is positioned by main.js through transform. */
.node {
  position: absolute;
  left: 0;
  top: 0;
  white-space: pre;
  text-decoration: none;
  pointer-events: auto;
  will-change: transform, opacity;
  transform-origin: 50% 50%;
}

/* Square, larger than the screen, rotated by main.js (compositor only). */
#stage #kaleido {
  position: absolute;
  left: 50%;
  top: 50%;
  right: auto;
  bottom: auto;
  display: block;
  z-index: 1;
  will-change: transform;
}

/* --- tunnel style: tiles and labels are drawn on the canvas (kaleido.js),
   the DOM element is an invisible hit area stretched over its tile --- */
.node.k {
  font-family: var(--grotesk);
  font-weight: 600;
  font-size: 15px;
  line-height: 1;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: transparent;
  padding: 10px 18px;
  background: none;
}
.node.k.title {
  font-family: var(--display);
  font-weight: 300;
  font-size: 17px;
  line-height: 1.45;
  letter-spacing: 0.22em;
  text-align: center;
  width: min-content;
  white-space: normal;
  padding: 0;
  color: transparent;   /* drawn cut out of the hexagon by kaleido.js */
  background: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  outline: none;
  box-shadow: none;
  pointer-events: none;
}

/* --- shan shui: the handscroll panels slide by transform (shanshui.js) --- */
#shan {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 1;
  visibility: hidden;
}
#shan canvas {
  position: absolute;
  left: 0;
  top: 0;
  will-change: transform;
}

/* Links are invisible hit areas over painted elements: only a breath of ink on hover. */
.node.s {
  color: transparent;
  padding: 0;
  background: none;
  border-radius: 40%;
}
/* A barely-there red halo, like a faded vermilion mark, gives the links away. */
.node.s:not(.title):not(.seal) {
  background: radial-gradient(closest-side, rgba(179, 54, 43, 0.1), rgba(179, 54, 43, 0));
  mix-blend-mode: multiply;
}
.node.s:not(.title):not(.seal):hover {
  background: radial-gradient(closest-side, rgba(40, 30, 20, 0.14), rgba(40, 30, 20, 0));
}
/* The title becomes an inscription, the 中文 link its red seal. */
.node.s.title {
  position: fixed;
  top: 8vh;
  right: 6vw;
  left: auto;
  writing-mode: vertical-rl;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-style: italic;
  font-size: 19px;
  letter-spacing: 0.28em;
  white-space: nowrap;
  color: rgba(45, 40, 34, 0.82);
  transform: none !important;
}
.node.s.seal {
  position: fixed;
  top: calc(8vh + var(--title-h, 220px) + 14px);
  right: calc(6vw - 6px);
  left: auto;
  writing-mode: vertical-rl;
  font-family: "Ma Shan Zheng", "Noto Serif SC", serif;
  font-size: 19px;
  line-height: 1;
  padding: 6px 5px;
  border-radius: 3px;
  color: rgba(244, 234, 214, 0.95);
  background: #b3362b;
  box-shadow: inset 0 0 0 2px rgba(244, 234, 214, 0.55);
  mix-blend-mode: multiply;
  transform: rotate(-3deg) !important;
}
.node.s.seal:hover { background: #8f2a21; }

/* --- ascii style: plain characters on the grid, like the ones around them.
   The paper background only blanks the glyphs underneath, it reads as spaces. --- */
.node.a {
  font-family: var(--mono);
  font-weight: 700;
  padding: 0;
  border-radius: 0;
  color: var(--hl);
  background: var(--paper);
}
.node.a:hover {
  background: var(--hl);
  color: var(--paper);
}
.node.a.title { pointer-events: none; }

/* --- hud: dressed like the section on screen (body[data-look], set by main.js) --- */
#hud {
  position: fixed;
  left: 12px;
  bottom: 10px;
  z-index: 3;
  display: flex;
  gap: 8px;
  align-items: center;
}
#hud button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  display: flex;
  gap: 0.45em;
  align-items: baseline;
  transition: background 0.3s, color 0.3s, box-shadow 0.3s;
}

/* tunnel: light tiles with the black line and the pop shadow of the rects */
body[data-look="tunnel"] #hud { gap: 10px; }
body[data-look="tunnel"] #hud button {
  font: 600 10px var(--grotesk);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #111114;
  background: #eeece6;
  outline: 1.5px solid #000;
  box-shadow: -2px 4px 0 rgba(0, 0, 0, 0.55);
  padding: 5px 9px;
}
body[data-look="tunnel"] #hud button.on { background: var(--k-ink); }
body[data-look="tunnel"] #hud .n { opacity: 0.5; }

/* ascii and clouds: plain characters on the grid, brackets instead of boxes */
body[data-look="ascii"] #hud button,
body[data-look="nuvole"] #hud button {
  font: 400 12px var(--mono);
  color: var(--hl);
  background: var(--paper);   /* blanks the glyphs underneath, like the links */
}
body[data-look="ascii"] #hud button::before,
body[data-look="nuvole"] #hud button::before { content: "["; margin-right: -0.25em; }
body[data-look="ascii"] #hud button::after,
body[data-look="nuvole"] #hud button::after { content: "]"; margin-left: -0.25em; }
body[data-look="ascii"] #hud button.on,
body[data-look="nuvole"] #hud button.on {
  opacity: 1;
  font-weight: 700;
  color: var(--paper);
  background: var(--hl);
}

/* shan shui: brush numerals and an italic name, the active one sealed in red */
body[data-look="shan"] #hud { gap: 18px; }
body[data-look="shan"] #hud button {
  color: rgba(45, 40, 34, 0.62);
  position: relative;
}
body[data-look="shan"] #hud .n { font-size: 0; }
body[data-look="shan"] #hud .n::before {
  content: attr(data-zh);
  font: 16px "Ma Shan Zheng", "Noto Serif SC", serif;
}
body[data-look="shan"] #hud .t { font-size: 0; }
body[data-look="shan"] #hud .t::before {
  content: attr(data-zh);
  font: 17px "Ma Shan Zheng", "Noto Serif SC", serif;
}
body[data-look="shan"] #hud button.on { color: rgba(45, 40, 34, 0.95); }
body[data-look="shan"] #hud button.on .n::before {
  color: #f4ead6;
  background: #b3362b;
  padding: 1px 2px;
  border-radius: 2px;
  mix-blend-mode: multiply;
}

#toast {
  position: fixed;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  font: 14px var(--mono);
  background: #000;
  color: #fff;
  padding: 6px 12px;
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}
#toast.show { opacity: 1; }

/* --- boring mode easter egg --- */
#boring {
  position: fixed;
  inset: 0;
  z-index: 10;
  background: #fff;
  color: #000;
  font: 16px/1.5 Times, serif;
  padding: 24px 16px;
  overflow: auto;
}
#boring a { color: #00e; }
#boring button { font: inherit; margin-top: 1em; }

@media (max-width: 600px) {
  .node.k { font-size: 12px; padding: 8px 14px; }
  .node.k.title { font-size: 13px; }
}