/* Katalog flipbook — gaya paparan. Warna diambil dari config.js */
:root {
  --k-utama: #0b0d3a;
  --k-kedua: #2518c4;
  --k-aksen: #f5b800;
  --k-nisbah: 1.414;
  --k-atas-h: 56px;
  --k-bawah-h: 64px;
  --k-pad-y: 16px;
  --k-pentas-h: calc(100vh - var(--k-atas-h) - var(--k-bawah-h));
  --k-avail-h: calc(var(--k-pentas-h) - var(--k-pad-y) * 2);
}
@supports (height: 100dvh) {
  :root { --k-pentas-h: calc(100dvh - var(--k-atas-h) - var(--k-bawah-h)); }
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; }
body {
  background: var(--k-utama);
  color: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}
button { font: inherit; }
[hidden] { display: none !important; }

.katalog {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(90% 70% at 50% 45%, color-mix(in srgb, var(--k-kedua) 38%, transparent) 0%, transparent 70%),
    var(--k-utama);
  overflow: hidden;
}

/* ---------- Bahagian atas ---------- */
.k-atas {
  height: var(--k-atas-h);
  flex: none;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  background: rgba(0, 0, 0, .18);
}
.k-logo {
  flex: none;
  display: flex;
  align-items: center;
  height: 36px;
  padding: 4px 12px;
  border-radius: 999px;
  background: #fff;
  text-decoration: none;
}
.k-logo img { display: block; height: 26px; width: auto; max-width: 140px; object-fit: contain; }
.k-logo span { color: var(--k-utama); font-weight: 800; font-size: 13px; letter-spacing: .02em; white-space: nowrap; }
.k-tajuk { min-width: 0; display: flex; flex-direction: column; line-height: 1.25; }
.k-tajuk strong { font-size: 15px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.k-tajuk span { font-size: 12px; opacity: .65; }
.k-tajuk span::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: var(--k-aksen);
  vertical-align: 1px;
}

/* ---------- Pentas (tempat buku) ---------- */
.k-pentas {
  flex: 1;
  min-height: 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--k-pad-y) 72px;
}
.k-buku-luar {
  position: relative;
  width: min(100%, calc(var(--k-avail-h) * 2 / var(--k-nisbah)));
  transition: transform .55s cubic-bezier(.25, .7, .25, 1);
}
.k-buku-luar.k-kulit-depan { transform: translateX(-25%); }
.k-buku-luar.k-kulit-belakang { transform: translateX(25%); }

/* St.PageFlip */
.stf__parent { position: relative; display: block; box-sizing: border-box; transform: translateZ(0); touch-action: pan-y; }
.stf__wrapper { position: relative; width: 100%; box-sizing: border-box; }
.stf__parent canvas { position: absolute; width: 100%; height: 100%; left: 0; top: 0; }
.stf__block { position: absolute; width: 100%; height: 100%; box-sizing: border-box; perspective: 2000px; }
.stf__item { display: none; position: absolute; transform-style: preserve-3d; }
.stf__outerShadow, .stf__innerShadow, .stf__hardShadow, .stf__hardInnerShadow { position: absolute; left: 0; top: 0; }

/* Muka surat */
.k-ms {
  position: relative;
  overflow: hidden;
  background: #eef0f6;
  cursor: pointer;
}
.k-ms img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity .25s ease;
  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}
.k-ms.k-siap img { opacity: 1; }
.k-ms:not(.k-siap)::before {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 28px; height: 28px;
  margin: -14px 0 0 -14px;
  border-radius: 50%;
  border: 3px solid rgba(11, 13, 58, .15);
  border-top-color: var(--k-kedua);
  animation: k-pusing .8s linear infinite;
}
@keyframes k-pusing { to { transform: rotate(360deg); } }
/* bayang tulang buku */
.k-mod-buku .k-ms.--left::after,
.k-mod-buku .k-ms.--right::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0;
  width: 7%;
  pointer-events: none;
}
.k-mod-buku .k-ms.--left::after { right: 0; background: linear-gradient(to left, rgba(0, 0, 0, .16), transparent); }
.k-mod-buku .k-ms.--right::after { left: 0; background: linear-gradient(to right, rgba(0, 0, 0, .16), transparent); }
.k-mod-buku .k-ms.--hard::after { display: none; }

/* Anak panah tepi (desktop) */
.k-anak {
  position: absolute;
  top: 50%;
  z-index: 5;
  width: 48px; height: 48px;
  margin-top: -24px;
  border: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: rgba(255, 255, 255, .1);
  cursor: pointer;
  transition: background .2s, opacity .2s;
}
.k-anak:hover { background: rgba(255, 255, 255, .2); }
.k-anak:disabled { opacity: .25; cursor: default; }
.k-anak svg { width: 24px; height: 24px; }
.k-anak-kiri { left: 14px; }
.k-anak-kanan { right: 14px; }

/* ---------- Mod ringkas (phone): 1 muka surat + leret ---------- */
.k-mod-ringkas .k-pentas { padding: 10px 0; }
.k-mod-ringkas .k-anak { display: none; }
.k-mod-ringkas .k-buku-luar { width: 100%; height: 100%; transform: none; }
.k-trek {
  display: flex;
  height: 100%;
  touch-action: none;
  will-change: transform;
}
.k-slaid {
  flex: 0 0 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
}
.k-slaid .k-ms {
  width: min(100%, calc((var(--k-pentas-h) - 20px) / var(--k-nisbah)));
  aspect-ratio: 1 / var(--k-nisbah);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .35);
  border-radius: 2px;
}

/* ---------- Bar alat bawah ---------- */
.k-bawah {
  flex: none;
  height: var(--k-bawah-h);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
}
.k-alat {
  display: flex;
  align-items: center;
  gap: 2px;
  max-width: 100%;
  padding: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .12);
  backdrop-filter: blur(8px);
}
.k-btn {
  flex: none;
  height: 40px;
  min-width: 40px;
  padding: 0 10px;
  border: 0;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: #fff;
  background: transparent;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background .2s, opacity .2s;
}
.k-btn:hover { background: rgba(255, 255, 255, .12); }
.k-btn:disabled { opacity: .3; cursor: default; background: transparent; }
.k-btn svg { width: 20px; height: 20px; flex: none; }
.k-btn.k-ikon { padding: 0; width: 40px; }
.k-kira {
  min-width: 78px;
  text-align: center;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  opacity: .9;
}
.k-kira b { color: var(--k-aksen); font-weight: 700; }
.k-pemisah { flex: none; width: 1px; height: 22px; margin: 0 4px; background: rgba(255, 255, 255, .18); }
.k-wa {
  background: #25d366;
  color: #062e17;
  padding: 0 16px 0 12px;
  margin-left: 4px;
}
.k-wa:hover { background: #2fe474; }

/* Petua ringkas semasa mula */
.k-petua {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  z-index: 6;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(0, 0, 0, .6);
  font-size: 13px;
  white-space: nowrap;
  pointer-events: none;
  transition: opacity .5s;
}
.k-petua.k-hilang { opacity: 0; }

/* ---------- Lapisan (grid & zoom) ---------- */
.k-lapis {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  flex-direction: column;
  background: #06071f;
}
.k-lapis-atas {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 56px;
  padding: 0 8px 0 18px;
  font-weight: 700;
}
.k-lapis-atas .k-alat { background: none; border: 0; padding: 0; backdrop-filter: none; }

.k-grid-isi {
  flex: 1;
  overflow-y: auto;
  padding: 6px 18px 28px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(118px, 1fr));
  gap: 16px 14px;
  align-content: start;
  overscroll-behavior: contain;
}
.k-th {
  border: 0;
  padding: 0;
  background: none;
  color: #fff;
  cursor: pointer;
  text-align: center;
}
.k-th img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / var(--k-nisbah);
  object-fit: cover;
  border-radius: 3px;
  background: rgba(255, 255, 255, .08);
  outline: 3px solid transparent;
  outline-offset: 2px;
  transition: outline-color .2s, transform .2s;
}
.k-th:hover img { transform: translateY(-2px); }
.k-th.aktif img { outline-color: var(--k-aksen); }
.k-th span { display: block; margin-top: 6px; font-size: 12px; opacity: .75; }
.k-th.aktif span { color: var(--k-aksen); opacity: 1; font-weight: 700; }

.k-zoom-vp {
  position: relative;
  flex: 1;
  overflow: hidden;
  touch-action: none;
  cursor: grab;
}
.k-zoom-vp.k-tarik { cursor: grabbing; }
.k-zoom-kanvas {
  position: absolute;
  left: 0; top: 0;
  display: flex;
  transform-origin: 0 0;
  will-change: transform;
}
.k-zoom-kanvas img {
  display: block;
  flex: 1 1 0;
  min-width: 0;
  height: 100%;
  object-fit: contain;
  background: #fff;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}
.k-zoom-petua {
  position: absolute;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(0, 0, 0, .65);
  font-size: 13px;
  white-space: nowrap;
  pointer-events: none;
}

.k-kosong {
  margin: auto;
  max-width: 420px;
  padding: 24px;
  text-align: center;
  line-height: 1.6;
  opacity: .85;
}

/* ---------- Saiz kecil ---------- */
@media (max-width: 759px) {
  :root { --k-atas-h: 52px; --k-bawah-h: 60px; }
  .k-atas { padding: 0 12px; gap: 10px; }
  .k-logo { height: 32px; padding: 3px 10px; }
  .k-logo img { height: 22px; max-width: 96px; }
  .k-tajuk strong { font-size: 14px; }
  .k-btn[data-k="penuh"], .k-btn .k-teks-pdf { display: none; }
  .k-btn[data-k="pdf"] { padding: 0; width: 40px; }
  .k-kira { min-width: 62px; font-size: 13px; }
  .k-pemisah { margin: 0 2px; }
  .k-btn.k-ikon, .k-btn[data-k="pdf"] { width: 38px; min-width: 38px; }
  .k-wa { padding: 0 12px 0 10px; }
  .k-grid-isi { grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 14px 10px; padding: 4px 12px 24px; }
}
@media (max-width: 370px) {
  .k-wa span { display: none; }
  .k-wa { padding: 0; width: 40px; }
  .k-kira { min-width: 56px; }
}
@media (prefers-reduced-motion: reduce) {
  .k-buku-luar, .k-ms img { transition: none; }
}

/* Butang ✕ Tutup katalog (tambahan) */
.k-tutup{position:fixed;top:10px;right:12px;z-index:9999;display:inline-flex;align-items:center;gap:6px;height:38px;padding:0 14px 0 12px;border:0;border-radius:99px;background:#fff;color:var(--k-utama,#0b0d3a);font:700 13px/1 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;box-shadow:0 6px 18px rgba(0,0,0,.25);cursor:pointer;transition:transform .15s,box-shadow .15s}
.k-tutup span{font-size:16px;line-height:1}.k-tutup:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(0,0,0,.3)}.k-tutup:focus-visible{outline:3px solid var(--k-aksen,#f5b800);outline-offset:2px}
.k-atas{padding-right:118px!important}
@media(max-width:600px){.k-tutup{top:8px;right:8px;height:36px;padding:0 11px}.k-tutup em{display:none}.k-atas{padding-right:56px!important}}