/* Whitepaper, VOID's 137 look: the shader world behind (#gl/#fx from paper-fx.js), the paper on glass cards,
   serif headings, and physics asides. Loaded after void.css and overrides its paper rules. */
.paper {
  --serif: "Instrument Serif", "Times New Roman", serif;
  --glass: linear-gradient(160deg, rgba(22, 11, 44, .74), rgba(6, 3, 14, .84));
  --glass-line: rgba(167, 139, 250, .16);
  --inset: rgba(10, 5, 22, .62);
  background: #040208;
}
html:has(body.paper) { background: #040208; }

.paper #gl, .paper #fx { position: fixed; inset: 0; width: 100vw; height: 100vh; display: block; pointer-events: none; }
.paper #gl { z-index: 0; }
.paper #fx { z-index: 1; }
.paper #tags { position: fixed; inset: 0; z-index: 4; pointer-events: none; }
.paper #tags .tag { position: absolute; width: 64px; height: 64px; transform: translate(-50%, -50%); border-radius: 50%; cursor: pointer; opacity: 0; pointer-events: none; transition: opacity .4s; }
.paper #tags .tag.on { opacity: 1; pointer-events: auto; }
.paper #tags .tag span { position: absolute; top: 100%; left: 50%; transform: translateX(-50%); margin-top: 2px; font: 500 11px var(--mono); color: var(--fg-3); white-space: nowrap; }
.paper #tags .tag.hit span { color: var(--ember); }

/* top bar */
.paper .top.solid { background: linear-gradient(rgba(4, 2, 8, .92), rgba(4, 2, 8, .55)); border-bottom-color: rgba(167, 139, 250, .12); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }
.paper .readbar i { background: linear-gradient(90deg, var(--vio-2), var(--ember)); box-shadow: 0 0 12px rgba(139, 92, 246, .8); }

/* layout: paper on the left, the stage to its right */
.paper .pwrap { z-index: 2; }
@media (min-width: 1001px) {
  .paper .pwrap { margin: 0; max-width: 1180px; grid-template-columns: 190px minmax(0, 820px); gap: 46px; }
}
.paper .toc { padding: 22px 18px; margin-top: 70px; border-radius: 16px; background: var(--glass); border: 1px solid var(--glass-line); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); }
.paper .toc a { border-left-color: rgba(167, 139, 250, .14); }
.paper .toc a.on { border-left-color: var(--ember); }

/* cover */
.paper .dhead { min-height: calc(100vh - var(--top) - 40px); display: flex; flex-direction: column; justify-content: center; padding: 40px 0 60px; }
.paper .dhead h1 {
  font: italic 400 clamp(64px, 9.5vw, 150px)/.86 var(--serif); letter-spacing: -.035em; padding-right: .08em;
  background: linear-gradient(180deg, #fff 10%, #d8ccff 50%, #8b5cf6 85%); -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 36px rgba(139, 92, 246, .4));
}
.paper .dhead h1 span { background: linear-gradient(180deg, #ffb48a, #ff6d2b); -webkit-background-clip: text; background-clip: text; color: transparent; }
.paper .dlede { color: var(--fg); text-shadow: 0 0 18px #000, 0 0 4px #000; }
.paper .stats { border-radius: 14px; overflow: hidden; border-color: var(--glass-line); background: var(--glass-line); }
.paper .stats div { background: var(--glass); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); }

/* sections are glass cards */
.paper .ps {
  margin-top: 64px; padding: 38px 40px 34px; border-radius: 22px;
  background: var(--glass); border: 1px solid var(--glass-line);
  -webkit-backdrop-filter: blur(16px) saturate(1.3); backdrop-filter: blur(16px) saturate(1.3);
  box-shadow: 0 24px 80px rgba(0, 0, 0, .5), inset 0 1px 0 rgba(255, 255, 255, .05);
  overflow: hidden;
}
.paper .ps[data-n]::before { top: 18px; right: 20px; -webkit-text-stroke: 1px rgba(167, 139, 250, .16); font-family: var(--serif); font-style: italic; font-weight: 400; }
.paper .phead { border-bottom-color: rgba(167, 139, 250, .16); }
.paper .phead h2 { font: italic 400 clamp(40px, 4.6vw, 64px)/.95 var(--serif); letter-spacing: -.01em; }
.paper .doc p { color: #cfc8e2; }

/* inset blocks */
.paper .math, .paper .tbl, .paper .fig, .paper .sim, .paper .panel, .paper .note, .paper .fly {
  background: var(--inset); border-color: rgba(167, 139, 250, .18); border-radius: 14px;
}
.paper .math { border-left: 2px solid var(--vio); }
.paper .callouts { border-radius: 14px; overflow: hidden; border-color: rgba(167, 139, 250, .18); background: rgba(167, 139, 250, .18); }
.paper .callouts > div { background: radial-gradient(120% 140% at 0% 0%, rgba(167, 139, 250, .14), rgba(167, 139, 250, 0) 60%), rgba(10, 5, 22, .9); }
.paper .art { border-radius: 14px; overflow: hidden; }
.paper .artrow img { border-radius: 14px; }
.paper .livechip { border-radius: 999px; }
.paper .flip > div { border-radius: 14px; }

/* physics asides */
.paper .phys {
  position: relative; margin: 34px 0; padding: 22px 24px 20px; border-radius: 16px;
  background:
    radial-gradient(130% 120% at 100% 0%, rgba(255, 109, 43, .10), rgba(255, 109, 43, 0) 55%),
    radial-gradient(120% 140% at 0% 100%, rgba(139, 92, 246, .22), rgba(139, 92, 246, 0) 60%),
    rgba(12, 6, 26, .78);
  border: 1px solid rgba(167, 139, 250, .3);
  box-shadow: 0 0 0 1px rgba(255, 109, 43, .06), 0 18px 60px rgba(76, 29, 149, .25);
}
.paper .phys::before {
  content: ""; position: absolute; inset: -1px; border-radius: inherit; padding: 1px; pointer-events: none;
  background: linear-gradient(120deg, rgba(167, 139, 250, .7), rgba(255, 109, 43, .5) 45%, rgba(167, 139, 250, .1) 70%, rgba(167, 139, 250, .6));
  background-size: 250% 250%; animation: physline 7s linear infinite;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude;
}
@keyframes physline { to { background-position: 250% 0; } }
.paper .phys-k { display: flex; align-items: baseline; gap: 12px; margin-bottom: 10px; font: italic 400 30px/1.05 var(--serif); color: #fff; }
.paper .phys-k span { font: 500 10.5px var(--mono); font-style: normal; letter-spacing: .22em; text-transform: uppercase; color: var(--ember); padding: 3px 8px; border: 1px solid rgba(255, 109, 43, .4); border-radius: 999px; transform: translateY(-5px); }
.paper .doc .phys p { font-size: 16px; line-height: 1.7; color: #ddd6f3; margin: 0; max-width: none; }
.paper .phys p b { color: #fff; }
.paper .phys > * + * { margin-top: 14px; }
.paper .phys .src { display: flex; flex-wrap: wrap; gap: 8px; }
.paper .phys .src a {
  display: inline-flex; align-items: center; gap: 7px; font: 12px var(--mono); color: var(--fg-2); text-decoration: none;
  padding: 6px 11px; border-radius: 999px; border: 1px solid rgba(167, 139, 250, .28); background: rgba(139, 92, 246, .08); transition: border-color .2s, color .2s, background .2s;
}
.paper .phys .src a::before { content: "src"; font-size: 10px; color: var(--vio); letter-spacing: .1em; }
.paper .phys .src a::after { content: "↗"; color: var(--fg-3); }
.paper .phys .src a:hover { border-color: var(--vio); color: #fff; background: rgba(139, 92, 246, .18); }
.paper .look {
  font: 500 13px var(--mono); letter-spacing: .24em; text-transform: uppercase; padding: 10px 24px; border-radius: 999px;
  border: 1px solid var(--vio); color: #fff; background: rgba(139, 92, 246, .14); cursor: pointer; transition: all .2s;
}
.paper .look:hover { background: rgba(139, 92, 246, .3); }
.paper .look[aria-pressed="true"] { background: var(--ember); border-color: var(--ember); color: #120600; box-shadow: 0 0 24px rgba(255, 109, 43, .5); }
.paper .grid137 { display: grid; grid-template-columns: repeat(23, 1fr); gap: 3px; max-width: 460px; }
.paper .grid137 i { aspect-ratio: 1; border-radius: 2px; background: rgba(167, 139, 250, .14); }
.paper .grid137 i.on { background: var(--ember); box-shadow: 0 0 10px rgba(255, 109, 43, .8); }
.paper .grid137 i.pop { animation: pop137 .5s ease-out both; }
@keyframes pop137 { from { transform: scale(0); opacity: 0; } }
/* the closing aside stands on its own after the disclaimer */
.paper .doc > .phys { margin-top: 64px; }

.paper .dfoot { border-top-color: rgba(167, 139, 250, .16); }

/* laptops: the side contents list would squeeze the stage, so it becomes the dropdown and the scenes get room */
@media (min-width: 1001px) and (max-width: 1500px) {
  .paper .pwrap { grid-template-columns: minmax(0, 660px); gap: 0; padding-top: calc(var(--top) + 48px + 24px); }
  .paper .toc { display: none; }
  .paper .jump {
    display: flex; align-items: center; gap: 12px; position: fixed; top: var(--top); left: 0; z-index: 19; height: 48px;
    width: calc(660px + 2 * var(--gut)); padding: 0 var(--gut); background: rgba(4, 2, 8, .82);
    -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); border-bottom: 1px solid rgba(167, 139, 250, .14); border-right: 1px solid rgba(167, 139, 250, .14);
  }
  .paper .jump select {
    flex: 1; min-width: 0; height: 34px; padding: 0 34px 0 12px; border: 1px solid rgba(167, 139, 250, .25); border-radius: 8px; color: #fff; font-family: var(--mono); font-size: 13px;
    background: rgba(10, 5, 22, .9) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23a78bfa'/%3E%3C/svg%3E") no-repeat right 12px center;
    -webkit-appearance: none; appearance: none;
  }
}
@media (max-width: 1000px) {
  .paper #tags { z-index: 1; }
  .paper .jump { background: rgba(4, 2, 8, .88); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); border-bottom-color: rgba(167, 139, 250, .14); }
  .paper .jump select { border-radius: 8px; border-color: rgba(167, 139, 250, .25); background-color: rgba(10, 5, 22, .9); }
  .paper .dhead { min-height: auto; padding: 46vh 0 30px; }
  .paper .ps { margin-top: 22vh; padding: 26px 20px 24px; border-radius: 18px; }
  .paper .ps.cont { margin-top: 18px; }
  .paper .phys { padding: 18px 18px 16px; -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); }
  .paper .phys-k { font-size: 26px; }
  .paper .doc > .phys { margin-top: 54vh; }
}
@media (prefers-reduced-motion: reduce) { .paper .phys::before { animation: none; } }
@media print {
  .paper #gl, .paper #fx, .paper #tags, .paper .look, .paper .grid137 { display: none !important; }
  .paper .ps, .paper .phys, .paper .toc { background: #fff !important; box-shadow: none !important; border-color: #ccc !important; -webkit-backdrop-filter: none; backdrop-filter: none; }
  .paper .phys::before { display: none; }
  .paper .dhead h1, .paper .dhead h1 span, .paper .phead h2, .paper .phys-k { color: #000 !important; -webkit-text-fill-color: #000; background: none; filter: none; }
  .paper .doc .phys p { color: #222 !important; }
}

/* "The burn" live scene (burn-fx.js) in place of the old picture, and the step it's on lit up */
.paper .burnfx {
  position: relative; height: 300px; margin: 6px 0 22px; border-radius: 14px; overflow: hidden;
  background: radial-gradient(90% 120% at 60% 70%, rgba(139, 92, 246, .16), rgba(139, 92, 246, 0) 60%), rgba(6, 3, 14, .7);
  border: 1px solid rgba(167, 139, 250, .18);
}
.paper .burnfx canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.paper #burn .steps li { transition: background .35s, color .35s; }
.paper #burn .steps li.now { background: linear-gradient(90deg, rgba(255, 109, 43, .12), rgba(255, 109, 43, 0) 70%); color: #fff; }
.paper #burn .steps li.now::before { color: var(--ember); text-shadow: 0 0 10px rgba(255, 109, 43, .8); }
@media (max-width: 600px) { .paper .burnfx { height: 230px; } }
@media print { .paper .burnfx { display: none; } }