/* Blueprints Book — dark "blueprint" art direction.
   Near-black ground, blueprint-blue ink, sparing red. */
:root {
  --bg:        #070b12;
  --bg-grid:   rgba(90, 162, 255, 0.045);
  --panel:     #0e141f;
  --panel-2:   #121a28;
  --line:      rgba(90, 162, 255, 0.18);
  --line-soft: rgba(90, 162, 255, 0.10);
  --ink:       #cdd9ec;
  --ink-dim:   #7d8aa0;
  --blue:      #5aa2ff;
  --blue-bright:#8cc3ff;
  --red:       #ff5247;
  --hi:        #ffd24d;            /* search highlight */
  --radius:    10px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; }
body {
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
  padding: 14px 22px;
  background: linear-gradient(180deg, rgba(7,11,18,0.97), rgba(7,11,18,0.82));
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 13px; }
.brand-mark {
  width: 30px; height: 30px; flex: none;
  border: 1.5px solid var(--blue);
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 7px 7px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 7px 7px;
  box-shadow: 0 0 14px rgba(90,162,255,0.35), inset 0 0 8px rgba(90,162,255,0.18);
  transform: rotate(45deg);
}
.brand-text h1 {
  font-family: var(--mono); font-size: 19px; font-weight: 600;
  letter-spacing: 1.5px; margin: 0; text-transform: uppercase; color: var(--ink);
}
.brand-text h1 .accent { color: var(--blue); }
.tagline {
  margin: 1px 0 0; font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 2px; text-transform: uppercase; color: var(--ink-dim);
}

.search-wrap { position: relative; flex: 1 1 320px; max-width: 560px; }
.search-icon {
  position: absolute; left: 13px; top: 50%; transform: translateY(-50%);
  width: 17px; height: 17px; fill: none; stroke: var(--ink-dim);
  stroke-width: 2; stroke-linecap: round; pointer-events: none;
}
#search {
  width: 100%; padding: 11px 38px 11px 40px;
  background: var(--panel); color: var(--ink);
  border: 1px solid var(--line); border-radius: var(--radius);
  font-family: var(--mono); font-size: 14px; letter-spacing: .3px;
  outline: none; transition: border-color .15s, box-shadow .15s;
}
#search::placeholder { color: var(--ink-dim); opacity: .8; }
#search:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(90,162,255,0.16); }
.kbd-hint {
  position: absolute; right: 11px; top: 50%; transform: translateY(-50%);
  font-family: var(--mono); font-size: 11px; color: var(--ink-dim);
  border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px;
}

/* ---------- Filters ---------- */
.filters {
  display: flex; gap: 9px; flex-wrap: wrap;
  padding: 16px 22px 4px;
}
.chip {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .5px;
  color: var(--ink-dim); background: var(--panel);
  border: 1px solid var(--line-soft); border-radius: 999px;
  padding: 6px 13px; cursor: pointer; white-space: nowrap;
  transition: all .14s;
}
.chip:hover { color: var(--ink); border-color: var(--line); }
.chip .n { opacity: .55; margin-left: 6px; }
.chip.active {
  color: var(--bg); background: var(--blue); border-color: var(--blue);
  box-shadow: 0 0 12px rgba(90,162,255,0.4);
}

/* ---------- Grid ---------- */
#main { padding: 8px 22px 64px; }
.result-meta {
  font-family: var(--mono); font-size: 11px; letter-spacing: 1px;
  color: var(--ink-dim); text-transform: uppercase; margin: 12px 2px 16px;
}
.grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(228px, 1fr));
}
.card {
  position: relative; background: var(--panel);
  border: 1px solid var(--line-soft); border-radius: var(--radius);
  overflow: hidden; cursor: pointer; text-align: left;
  transition: transform .16s, border-color .16s, box-shadow .16s;
}
.card:hover {
  transform: translateY(-3px); border-color: var(--blue);
  box-shadow: 0 10px 30px rgba(0,0,0,.5), 0 0 0 1px rgba(90,162,255,.25);
}
.card-thumb {
  position: relative; aspect-ratio: 4 / 3; background: #05080d;
  overflow: hidden;
}
.card-thumb img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  filter: saturate(.92) contrast(1.02);
  transition: transform .3s ease;
}
.card:hover .card-thumb img { transform: scale(1.04); }
.card-pages {
  position: absolute; top: 8px; right: 8px;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .5px;
  background: rgba(7,11,18,0.82); color: var(--blue-bright);
  border: 1px solid var(--line); border-radius: 5px; padding: 2px 7px;
  backdrop-filter: blur(3px);
}
.card-body { padding: 11px 13px 13px; }
.card-cat {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 1.2px;
  text-transform: uppercase; color: var(--blue); opacity: .85;
}
.card-title {
  margin: 4px 0 0; font-size: 14.5px; font-weight: 600; color: var(--ink);
  line-height: 1.3;
}
.card-pg { color: var(--ink-dim); font-weight: 400; font-size: 12px; }
.card-snip {
  margin: 7px 0 0; font-size: 11.5px; line-height: 1.45; color: var(--ink-dim);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-snip mark, .card-title mark {
  background: transparent; color: var(--hi); font-weight: 700;
  text-shadow: 0 0 8px rgba(255,210,77,.4);
}
.empty { text-align: center; color: var(--ink-dim); font-family: var(--mono); padding: 60px 0; }

/* category divider when browsing */
.cat-head {
  grid-column: 1 / -1; display: flex; align-items: center; gap: 14px;
  margin: 18px 0 2px;
}
.cat-head:first-child { margin-top: 0; }
.cat-head h2 {
  font-family: var(--mono); font-size: 12px; letter-spacing: 2px;
  text-transform: uppercase; color: var(--blue); margin: 0; white-space: nowrap;
}
.cat-head .rule { height: 1px; background: var(--line-soft); flex: 1; }
.cat-head .ct { font-family: var(--mono); font-size: 11px; color: var(--ink-dim); }

/* ---------- Viewer / zoom ---------- */
.viewer {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(3,5,9,0.97);
  display: flex; flex-direction: column;
}
.viewer-top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; border-bottom: 1px solid var(--line);
  background: rgba(7,11,18,0.7); z-index: 3;
}
.viewer-title { font-family: var(--mono); font-size: 13px; letter-spacing: .5px; color: var(--ink); display: flex; gap: 10px; align-items: baseline; }
.viewer-count { color: var(--ink-dim); font-size: 11px; }
.viewer-actions { display: flex; gap: 8px; }
.vbtn {
  font-family: var(--mono); font-size: 12px; letter-spacing: .5px;
  color: var(--ink); background: var(--panel); border: 1px solid var(--line);
  border-radius: 7px; padding: 6px 11px; cursor: pointer; transition: all .14s;
}
.vbtn:hover { border-color: var(--blue); color: var(--blue-bright); }
.vbtn.active { background: var(--blue); color: var(--bg); border-color: var(--blue); }
.vclose:hover { border-color: var(--red); color: var(--red); }

.stage {
  position: relative; flex: 1; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  touch-action: none;            /* let panzoom own the gestures */
  cursor: grab;
}
.stage:active { cursor: grabbing; }
#vImg {
  max-width: 100%; max-height: 100%; object-fit: contain;
  user-select: none; -webkit-user-drag: none;
  will-change: transform;
}
.nav {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 4;
  width: 48px; height: 64px; border: 1px solid var(--line);
  background: rgba(7,11,18,0.6); color: var(--ink); font-size: 30px;
  cursor: pointer; border-radius: 8px; transition: all .14s;
}
.nav:hover { color: var(--blue-bright); border-color: var(--blue); background: rgba(14,20,31,0.9); }
.nav.prev { left: 14px; } .nav.next { right: 14px; }

.textpanel {
  position: absolute; right: 0; top: 0; bottom: 0; width: min(420px, 88vw);
  background: var(--panel); border-left: 1px solid var(--line);
  padding: 18px; overflow-y: auto; z-index: 5;
  box-shadow: -20px 0 40px rgba(0,0,0,.5);
}
.tp-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 10px; }
#tpTitle { font-family: var(--mono); font-size: 13px; letter-spacing: .5px; color: var(--blue); }
.tp-copy {
  font-family: var(--mono); font-size: 10.5px; color: var(--ink-dim);
  background: none; border: 1px solid var(--line); border-radius: 5px;
  padding: 3px 9px; cursor: pointer; transition: all .14s;
}
.tp-copy:hover { color: var(--blue); border-color: var(--blue); }
.tp-desc { font-size: 13px; line-height: 1.5; color: var(--ink-dim); margin: 0 0 14px; }
.tp-trans {
  font-family: var(--mono); font-size: 12.5px; line-height: 1.6; color: var(--ink);
  white-space: pre-wrap; word-break: break-word; margin: 0;
  padding: 12px; background: #05080d; border: 1px solid var(--line-soft); border-radius: 8px;
}
.tp-tags { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 6px; }
.tp-tags span {
  font-family: var(--mono); font-size: 10.5px; color: var(--ink-dim);
  border: 1px solid var(--line-soft); border-radius: 999px; padding: 2px 8px;
}

@media (max-width: 600px) {
  .topbar { gap: 12px; padding: 11px 14px; }
  .brand-text h1 { font-size: 16px; }
  .search-wrap { flex-basis: 100%; order: 3; }
  .filters { padding: 12px 14px 2px; }
  #main { padding: 6px 14px 56px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 11px; }
  .nav { width: 38px; height: 54px; font-size: 24px; }
  .kbd-hint { display: none; }
}