/* =========================================================
   JS TECHWIN e-Catalogue  –  page-flip viewer styles
   ========================================================= */
:root {
  --bg-1: #ececec;
  --bg-2: #c6c6c6;
  --ink: #444;
  --ink-soft: #7a7a7a;
  --brand: #26397a;          /* JS TECHWIN navy */
  --brand-soft: #e4e8f3;
  --bar-h: 56px;
  --top-h: 52px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; height: 100%;
  overflow: hidden;
  font-family: "Noto Sans KR", "Malgun Gothic", "Apple SD Gothic Neo", Arial, sans-serif;
  color: var(--ink);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}
body {
  background:
    linear-gradient(115deg, rgba(255,255,255,.55) 0%, rgba(255,255,255,0) 35%, rgba(0,0,0,.05) 60%, rgba(255,255,255,.35) 100%),
    radial-gradient(ellipse at 50% 45%, var(--bg-1) 0%, var(--bg-2) 100%);
}

/* ---------- top bar ---------- */
.topbar {
  position: fixed; left: 0; right: 0; top: 0; height: var(--top-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 18px; z-index: 20; pointer-events: none;
}
.topbar > * { pointer-events: auto; }
.topbar .logo img { height: 26px; display: block; }
.topbar .title {
  font-size: 13px; letter-spacing: .04em; color: var(--ink-soft);
  font-weight: 500; white-space: nowrap;
}
.topbar .title b { color: var(--brand); font-weight: 700; margin-left: 6px; }

/* ---------- stage ---------- */
.viewer {
  position: absolute; left: 0; right: 0;
  top: var(--top-h); bottom: var(--bar-h);
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  scrollbar-width: thin;
}
.viewer.is-zoomed { overflow: auto; cursor: grab; }
.viewer.is-zoomed.dragging { cursor: grabbing; }
.stage {
  flex: 0 0 auto;
  margin: auto;                       /* keeps centred, scrollable when zoomed */
  filter: drop-shadow(0 18px 30px rgba(0,0,0,.28));
}
.stage.no-shadow { filter: none; }
/* Keep the rotating page and its shadows inside the book bounds. */
.book { overflow: hidden; }
.book .page {
  background: #fff;
  overflow: hidden;
}
.book .page img {
  display: block; width: 100%; height: 100%;
  object-fit: fill;
  pointer-events: none;
  -webkit-user-drag: none;
}
.book .page.is-loading { background: #f3f3f3; }

/* ---------- nav arrows ---------- */
.nav-arrow {
  position: fixed; top: 50%; transform: translateY(-50%);
  width: 56px; height: 90px; border: 0; background: transparent;
  color: #5c5c5c; cursor: pointer; z-index: 15; padding: 0;
  display: flex; align-items: center; justify-content: center;
  opacity: .95; transition: opacity .2s, transform .2s;
  filter: drop-shadow(0 1px 2px rgba(255,255,255,.8));
}
.nav-arrow svg { width: 36px; height: 36px; stroke-width: 2.4; }
.nav-arrow.prev { left: 6px; }
.nav-arrow.next { right: 6px; }
.nav-arrow:hover { opacity: 1; transform: translateY(-50%) scale(1.12); }
.nav-arrow[disabled] { opacity: .18; cursor: default; transform: translateY(-50%); }

.nav-edge {
  position: fixed; bottom: calc(var(--bar-h) + 42px);
  width: 30px; height: 30px; border: 0; background: transparent;
  color: #5c5c5c; cursor: pointer; z-index: 15; padding: 0; opacity: .85;
  filter: drop-shadow(0 1px 2px rgba(255,255,255,.8));
}
.nav-edge svg { width: 22px; height: 22px; }
.nav-edge.first { left: 18px; }
.nav-edge.last { right: 18px; }
.nav-edge[disabled] { opacity: .18; cursor: default; }

/* ---------- bottom toolbar ---------- */
.toolbar {
  position: fixed; left: 0; right: 0; bottom: 0; height: var(--bar-h);
  display: flex; align-items: center; gap: 4px;
  padding: 0 14px; z-index: 20;
  background: linear-gradient(to top, rgba(255,255,255,.55), rgba(255,255,255,0));
}
.toolbar .tb-btn {
  width: 36px; height: 36px; border: 0; border-radius: 6px;
  background: transparent; color: var(--ink); cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background .15s, color .15s;
}
.toolbar .tb-btn:hover { background: rgba(0,0,0,.08); color: var(--brand); }
.toolbar .tb-btn.active { background: var(--brand); color: #fff; }
.toolbar .tb-btn svg { width: 20px; height: 20px; }
.toolbar .tb-btn[disabled] { opacity: .3; cursor: default; background: transparent; }

.toolbar .pager {
  display: inline-flex; align-items: center; gap: 4px;
  margin: 0 8px 0 6px; font-size: 13px; color: var(--ink); font-variant-numeric: tabular-nums;
}
.toolbar .pager input {
  width: 42px; height: 28px; border: 1px solid rgba(0,0,0,.15); border-radius: 4px;
  background: rgba(255,255,255,.8); text-align: center; font: inherit; color: var(--ink);
  outline: none;
}
.toolbar .pager input:focus { border-color: var(--brand); }
.toolbar .pager .total { color: var(--ink-soft); }

.toolbar .slider {
  flex: 1 1 auto; min-width: 60px; margin: 0 14px;
  -webkit-appearance: none; appearance: none; height: 3px; border-radius: 2px;
  background: rgba(0,0,0,.28); outline: none; cursor: pointer;
}
.toolbar .slider::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%;
  background: #fff; border: 2px solid #8a8a8a; cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,.3);
}
.toolbar .slider::-moz-range-thumb {
  width: 12px; height: 12px; border-radius: 50%;
  background: #fff; border: 2px solid #8a8a8a; cursor: pointer;
}
.toolbar .sep { width: 1px; height: 22px; background: rgba(0,0,0,.15); margin: 0 6px; }

/* ---------- thumbnail drawer ---------- */
.thumbs {
  position: fixed; left: 0; right: 0; bottom: var(--bar-h);
  height: 168px; z-index: 18;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(6px);
  box-shadow: 0 -4px 18px rgba(0,0,0,.12);
  transform: translateY(calc(100% + var(--bar-h) + 10px)); transition: transform .28s ease;
  display: flex; align-items: center; overflow-x: auto; overflow-y: hidden;
  padding: 0 18px; gap: 10px;
  scrollbar-width: thin;
}
.thumbs.open { transform: translateY(0); }
.thumbs .th {
  flex: 0 0 auto; height: 128px; aspect-ratio: 1241 / 1754;
  background: #fff; border: 2px solid transparent; border-radius: 3px;
  box-shadow: 0 2px 6px rgba(0,0,0,.18); cursor: pointer; position: relative;
  transition: border-color .15s, transform .15s;
}
.thumbs .th:hover { transform: translateY(-3px); }
.thumbs .th.active { border-color: var(--brand); }
.thumbs .th img { width: 100%; height: 100%; display: block; border-radius: 2px; }
.thumbs .th span {
  position: absolute; left: 50%; bottom: -18px; transform: translateX(-50%);
  font-size: 11px; color: var(--ink-soft);
}
.thumbs .th-group { display: flex; gap: 2px; padding-bottom: 20px; }
.thumbs .th-group + .th-group { margin-left: 8px; }

/* ---------- loading ---------- */
.loader {
  position: fixed; inset: 0; z-index: 50;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: var(--bg-1); color: var(--ink-soft); font-size: 13px; letter-spacing: .08em;
  transition: opacity .4s; gap: 16px;
}
.loader.hide { opacity: 0; pointer-events: none; }
.loader img { height: 28px; }
.loader .bar { width: 160px; height: 3px; background: rgba(0,0,0,.1); border-radius: 2px; overflow: hidden; }
.loader .bar i { display: block; height: 100%; width: 0; background: var(--brand); transition: width .2s; }

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  :root { --bar-h: 50px; --top-h: 44px; }
  .topbar { padding: 0 12px; }
  .topbar .title { font-size: 11px; }
  .topbar .title b { display: none; }
  .nav-arrow { width: 40px; height: 70px; }
  .nav-arrow svg { width: 26px; height: 26px; }
  .nav-arrow.prev { left: 0; } .nav-arrow.next { right: 0; }
  .nav-edge { display: none; }
  .toolbar { padding: 0 6px; gap: 0; }
  .toolbar .slider { margin: 0 8px; }
  .toolbar .sep, .toolbar .tb-zoom { display: none; }
  .thumbs { height: 140px; padding: 0 12px; }
  .thumbs .th { height: 100px; }
}
@media (max-width: 420px) {
  .toolbar .pager input { width: 36px; }
}