/* ============================================================
   Slide viewer — builds on the tokens in site.css
   ============================================================ */

body.viewer { overflow: hidden; height: 100dvh; display: flex; flex-direction: column; }
body.viewer::before, body.viewer::after { display: none; }   /* no glow/grain behind slides */

/* ---------- top bar ---------- */

.v-bar {
  flex: none;
  display: flex; align-items: center; gap: .55rem;
  padding: .55rem clamp(.6rem, 2vw, 1rem);
  border-bottom: 1px solid var(--line);
  background: var(--bg-2);
  z-index: 20;
}
.v-back {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .42rem .8rem; border-radius: 100px;
  border: 1px solid var(--line); background: var(--card);
  font-size: .84rem; font-weight: 560; color: var(--ink-2);
  white-space: nowrap;
  transition: background .2s, color .2s, border-color .2s;
}
.v-back:hover { background: var(--card-2); color: var(--ink); border-color: var(--line-2); }

.v-title { min-width: 0; margin-left: .3rem; }
.v-title b {
  display: block; font-size: .92rem; font-weight: 650; letter-spacing: -.01em;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.v-title span {
  display: block; font-family: var(--mono); font-size: .62rem;
  letter-spacing: .12em; text-transform: uppercase; color: var(--mut);
}

.v-spacer { margin-left: auto; }

.v-group {
  display: flex; align-items: center; gap: .15rem;
  border: 1px solid var(--line); border-radius: 100px;
  background: var(--card); padding: .2rem;
}
.v-btn {
  width: 30px; height: 30px; flex: none;
  display: grid; place-items: center;
  border: 0; border-radius: 50%; background: none; cursor: pointer;
  color: var(--ink-2); font-family: inherit; font-size: .8rem;
  transition: background .18s, color .18s;
}
.v-btn:hover:not(:disabled) { background: var(--card-2); color: var(--ink); }
.v-btn:disabled { opacity: .3; cursor: default; }
.v-btn svg { width: 15px; height: 15px; }
.v-btn.wide { width: auto; padding-inline: .7rem; border-radius: 100px; font-size: .78rem; font-weight: 600; }
.v-btn[aria-pressed="true"] { background: var(--acid); color: var(--on-accent); }

.v-page { display: flex; align-items: center; gap: .3rem; padding-inline: .4rem; }
.v-page input {
  width: 2.9rem; text-align: center;
  font-family: var(--mono); font-size: .8rem;
  color: var(--ink); background: var(--card-2);
  border: 1px solid var(--line); border-radius: 6px; padding: .18rem .1rem;
}
.v-page input:focus { border-color: var(--acid); outline: none; }
.v-page span { font-family: var(--mono); font-size: .76rem; color: var(--mut); white-space: nowrap; }

select.v-select {
  font-family: inherit; font-size: .82rem; font-weight: 550;
  color: var(--ink-2); background: var(--card);
  border: 1px solid var(--line); border-radius: 100px;
  padding: .42rem 1.7rem .42rem .8rem; cursor: pointer;
  max-width: 12rem;
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238a8aa0' stroke-width='2.4' stroke-linecap='round'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat: no-repeat; background-position: right .55rem center; background-size: 12px;
}
select.v-select:hover { color: var(--ink); border-color: var(--line-2); }

/* ---------- body ---------- */

.v-body { flex: 1; display: flex; min-height: 0; }

/* thumbnail rail */
.v-rail {
  flex: none; width: 158px;
  border-right: 1px solid var(--line);
  background: var(--bg-2);
  overflow-y: auto; overscroll-behavior: contain;
  padding: .6rem;
  scrollbar-width: thin;
}
.v-rail[hidden] { display: none; }
.v-thumb {
  display: block; width: 100%; margin-bottom: .5rem;
  border: 1px solid var(--line); border-radius: 7px;
  background: var(--card); cursor: pointer; padding: 0;
  overflow: hidden; position: relative;
  transition: border-color .2s, transform .2s;
}
.v-thumb:hover { border-color: var(--line-2); transform: translateY(-1px); }
.v-thumb[aria-current="true"] { border-color: var(--acid); box-shadow: 0 0 0 2px color-mix(in oklab, var(--acid) 30%, transparent); }
.v-thumb canvas { display: block; width: 100%; height: auto; }
.v-thumb .ph { display: block; width: 100%; aspect-ratio: 16 / 10; }
.v-thumb i {
  position: absolute; right: 3px; bottom: 3px;
  font-family: var(--mono); font-size: .58rem; font-style: normal;
  padding: .05rem .3rem; border-radius: 4px;
  background: color-mix(in oklab, var(--bg) 78%, transparent); color: var(--ink-2);
}

/* stage */
.v-stage {
  flex: 1; min-width: 0;
  overflow: auto; overscroll-behavior: contain;
  display: grid; place-items: center;
  padding: clamp(.6rem, 2vw, 1.4rem);
  background: var(--bg);
}
.v-holder { position: relative; line-height: 0; }
.v-holder canvas {
  display: block; border-radius: 6px;
  box-shadow: 0 18px 50px -22px rgba(0,0,0,.8);
  background: #fff;
}

/* text layer (selection) — geometry comes from pdf.js */
.v-text {
  position: absolute; inset: 0;
  text-align: initial; overflow: clip; line-height: 1;
  opacity: 1; forced-color-adjust: none;
  transform-origin: 0 0;
  -webkit-text-size-adjust: none; text-size-adjust: none;
}
.v-text span, .v-text br {
  color: transparent; position: absolute; white-space: pre;
  cursor: text; transform-origin: 0% 0%;
}
.v-text ::selection { background: color-mix(in oklab, var(--acid) 45%, transparent); }
.v-text .endOfContent {
  position: absolute; inset: 100% 0 0; display: block;
  cursor: default; user-select: none;
}

/* states */
.v-msg {
  display: grid; place-items: center; gap: .8rem;
  text-align: center; color: var(--mut); font-size: .9rem; padding: 3rem 1rem;
}
.v-msg b { color: var(--ink); font-size: 1.05rem; font-weight: 650; }
.v-spin {
  width: 26px; height: 26px; border-radius: 50%;
  border: 2px solid var(--line-2); border-top-color: var(--acid);
  animation: vspin .7s linear infinite;
}
@keyframes vspin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .v-spin { animation-duration: 2s; } }

.v-bar-progress {
  position: absolute; left: 0; top: 0; height: 2px;
  background: var(--acid); width: 0; transition: width .25s ease, opacity .4s;
}

/* ---------- small screens ---------- */
@media (max-width: 900px) {
  .v-rail { display: none; }
  .v-title { display: none; }
  .v-hide-sm { display: none; }
  .v-bar { gap: .4rem; }
  select.v-select { max-width: 8rem; }
}
@media (max-width: 560px) {
  .v-back span { display: none; }
  .v-back { padding-inline: .6rem; }
}

/* ============================================================
   Book reader — continuous scroll + outline TOC
   ============================================================ */

body.book { overflow: hidden; height: 100dvh; display: flex; flex-direction: column; }
body.book::before, body.book::after { display: none; }

/* outline rail */
.bk-toc {
  flex: none; width: 310px;
  border-right: 1px solid var(--line);
  background: var(--bg-2);
  overflow-y: auto; overscroll-behavior: contain;
  padding: .8rem .5rem 3rem;
  scrollbar-width: thin;
}
.bk-toc[hidden] { display: none; }
.bk-toc ul { list-style: none; margin: 0; padding: 0; }
.bk-toc li { margin: 0; }
.bk-toc button {
  display: flex; align-items: baseline; gap: .5rem; width: 100%;
  text-align: left; background: none; cursor: pointer;
  border: 0; border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  padding: .34rem .5rem .34rem .6rem;
  font-family: inherit; font-size: .82rem; line-height: 1.35; color: var(--ink-2);
  transition: background .16s, color .16s, border-color .16s;
}
.bk-toc button:hover { background: var(--card-2); color: var(--ink); }
.bk-toc button .pg {
  margin-left: auto; flex: none;
  font-family: var(--mono); font-size: .66rem; color: var(--mut);
}
.bk-toc button[aria-current="true"] {
  background: color-mix(in oklab, var(--acid) 12%, transparent);
  border-left-color: var(--acid); color: var(--ink); font-weight: 600;
}
/* depth 0 = parts, 1 = chapters, 2+ = sections */
.bk-toc .d0 > button { font-weight: 700; font-size: .8rem; letter-spacing: .02em;
  text-transform: uppercase; color: var(--acid); margin-top: 1rem; }
.bk-toc .d1 > button { font-weight: 600; font-size: .84rem; color: var(--ink); }
.bk-toc .d2 > button { padding-left: 1.5rem; font-size: .79rem; }
.bk-toc .d3 > button { padding-left: 2.4rem; font-size: .76rem; color: var(--mut); }

/* scrolling page column */
.bk-scroll {
  flex: 1; min-width: 0;
  overflow-y: auto; overscroll-behavior: contain;
  background: var(--bg);
  padding: clamp(.7rem, 2vw, 1.6rem) 0 6rem;
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) { .bk-scroll { scroll-behavior: auto; } }

.bk-pages { margin: 0 auto; width: var(--bk-w, 860px); max-width: 100%; }
.bk-page {
  position: relative; width: 100%;
  margin-bottom: clamp(.7rem, 1.6vw, 1.3rem);
  background: #fff; border-radius: 4px;
  box-shadow: 0 10px 34px -20px rgba(0,0,0,.75);
  overflow: hidden;
}
.bk-page canvas { display: block; width: 100%; height: auto; }
.bk-page .ph {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-family: var(--mono); font-size: .7rem; color: #b9b9c4;
  background: repeating-linear-gradient(-45deg, #fafafc 0 12px, #f3f3f6 12px 24px);
}
.bk-num {
  position: absolute; right: 6px; bottom: 5px; z-index: 3;
  font-family: var(--mono); font-size: .6rem;
  padding: .06rem .34rem; border-radius: 4px;
  background: rgba(0,0,0,.45); color: #fff; pointer-events: none;
}

@media (max-width: 860px) {
  .bk-toc {
    position: absolute; z-index: 30; top: 52px; bottom: 0; left: 0;
    width: min(86vw, 320px);
    box-shadow: 0 0 60px rgba(0,0,0,.5);
  }
}