/**
 * Books lab + book3d (archive prototype, productionized).
 */

@import "../../src/tokens/stage.css";

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-brand);
}

#page {
  max-width: 90rem;
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3rem);
  padding-right: max(clamp(1.5rem, 4vw, 3rem), min(24ch, 28vw));
  padding-bottom: 5rem;
}
body.osd-dock-tl #page {
  padding-right: clamp(1.5rem, 4vw, 3rem);
  padding-left: max(clamp(1.5rem, 4vw, 3rem), min(24ch, 28vw));
}

.books-head {
  max-width: 52ch;
  margin-bottom: clamp(40px, 7vh, 72px);
}
.books-head .if-eyebrow { display: block; margin-bottom: 14px; }
.books-head h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(28px, 4vw, 48px);
  letter-spacing: -0.02em;
  line-height: 1.12;
}
.books-head p {
  margin-top: 1rem;
  color: var(--muted);
  font-weight: 400;
  font-size: 15px;
  line-height: 1.55;
}

/* ── 3D book ────────────────────────────────────────────── */

.book-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: clamp(48px, 8vh, 96px) clamp(24px, 3.2vw, 52px);
}

.book3d {
  margin: 0;
  --w: calc(var(--h, 262px) * var(--ar, 0.72));
  --d: 48px;
  --spine: #2a2622;
  --persp: 1700px;
}

.book3d__stage {
  position: relative;
  width: var(--w);
  height: var(--h, 262px);
  perspective: var(--persp);
  cursor: grab;
}

.book3d__stage::after {
  content: "";
  position: absolute;
  left: 3%;
  right: 9%;
  bottom: -7%;
  height: 9%;
  background: radial-gradient(
    ellipse at 50% 50%,
    rgba(0, 0, 0, 0.36),
    transparent 70%
  );
  filter: blur(8px);
  transition: transform 0.5s var(--ease), opacity 0.5s var(--ease);
  z-index: -1;
}
.book3d:hover .book3d__stage::after {
  transform: scale(1.08);
  opacity: 0.92;
}

.book3d__rotate {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transform: rotateX(var(--rx, 0deg)) rotateY(var(--ry, -26deg))
    translateY(var(--ty, 0px));
  transition: transform 0.9s var(--ease);
  will-change: transform;
}
.book3d.tracking .book3d__rotate {
  transition: transform 0.1s ease-out;
}

.book3d__cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translateZ(calc(var(--d) / 2));
  border-radius: 2px 4px 4px 2px;
  backface-visibility: hidden;
  box-shadow:
    inset 10px 0 18px -11px rgba(0, 0, 0, 0.62),
    inset -1px 0 2px rgba(255, 255, 255, 0.22),
    0 0 1px rgba(0, 0, 0, 0.45);
}
.book3d__cover--empty {
  display: block;
}

.book3d__back {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: var(--spine);
  transform: translateZ(calc(var(--d) / -2)) rotateY(180deg);
  border-radius: 4px 2px 2px 4px;
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.35);
}

.book3d__spine {
  position: absolute;
  top: 0;
  left: calc(50% - var(--d) / 2);
  width: var(--d);
  height: 100%;
  transform: rotateY(-90deg) translateZ(calc(var(--w) / 2));
  background:
    linear-gradient(
      90deg,
      rgba(0, 0, 0, 0.55),
      rgba(255, 255, 255, 0.07) 16%,
      rgba(0, 0, 0, 0.12) 82%,
      rgba(0, 0, 0, 0.55)
    ),
    var(--spine);
}

.book3d__pages {
  position: absolute;
  top: 3px;
  left: calc(50% - var(--d) / 2);
  width: var(--d);
  height: calc(100% - 6px);
  transform: rotateY(90deg) translateZ(calc(var(--w) / 2));
  background: repeating-linear-gradient(
    90deg,
    #efe9d9 0 1px,
    #d2c9b2 1px 2.4px
  );
  box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.22);
}

.book3d__edge {
  position: absolute;
  left: 0;
  top: calc(50% - var(--d) / 2);
  width: 100%;
  height: var(--d);
  transform: rotateX(90deg) translateZ(calc(var(--h) / 2));
  background: repeating-linear-gradient(
    0deg,
    #efe9d9 0 1px,
    #d2c9b2 1px 2.4px
  );
}

.book3d figcaption {
  margin-top: 28px;
  width: var(--w);
}
.book3d figcaption h3 {
  font-family: var(--font-brand);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.005em;
  line-height: 1.25;
  color: var(--fg);
}
.book3d .pub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 6px;
}

@media (max-width: 1100px) {
  .book3d { --h: 236px !important; }
}
@media (max-width: 560px) {
  .book3d { --h: 194px !important; }
  .book-grid { gap: 52px 20px; }
}
@media (prefers-reduced-motion: reduce) {
  .book3d__rotate {
    transform: rotateY(-20deg) !important;
    transition: none;
  }
}

/* HUDDI chrome */
#chrome { position: fixed; inset: 0; z-index: 50; pointer-events: none; }
#topRight {
  position: absolute;
  top: calc(8px * var(--s, 2));
  right: calc(8px * var(--s, 2));
  bottom: calc(8px * var(--s, 2));
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  pointer-events: none;
  z-index: 60;
}
body.osd-dock-tl #topRight {
  right: auto;
  left: calc(8px * var(--s, 2));
  align-items: flex-start;
}
#menu {
  pointer-events: auto;
  width: max-content;
  max-width: min(100%, 22ch);
  max-height: calc(100dvh - 16px * var(--s, 2));
  overflow-y: scroll;
  scrollbar-width: none;
}
#menu::-webkit-scrollbar { display: none; }
#trkStack {
  position: absolute;
  left: calc(8px * var(--s, 2));
  bottom: calc(8px * var(--s, 2));
  pointer-events: none;
  z-index: 60;
}
body.osd-dock-tl #trkStack { left: auto; right: calc(8px * var(--s, 2)); }
#trk { pointer-events: auto; display: flex; gap: 1ch; }
#hudChip {
  position: absolute;
  top: calc(8px * var(--s, 2));
  left: calc(8px * var(--s, 2));
  display: none;
  z-index: 61;
  pointer-events: none;
  transition: opacity 280ms ease;
}
#hudChip.is-hiding { opacity: 0; }
body.osd-dock-tl #hudChip { left: auto; right: calc(8px * var(--s, 2)); }

#hint {
  position: fixed;
  bottom: 10px;
  left: 14px;
  z-index: 40;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0.65;
  pointer-events: none;
}