/* Halaman buku — assets/buku.css
 *
 * Dimuatkan sebagai extra_css oleh buku.php dan buku-resit.php. Rangka halaman
 * (.app-halaman, .app-btn) datang daripada pwa.css; token daripada
 * tfd-system.css (--tfd-*) dengan sandaran heks. Corak sama seperti
 * assets/sumbang.css.
 *
 * Susun atur: hero penuh lebar, kemudian grid borang + ringkasan melekat pada
 * ≥ 900px. Di bawah itu satu lajur dengan bar jumlah melekat di kaki skrin.
 */

/* Spesifisiti dua kelas: pwa.css (.app-halaman, max-width 720px) dimuat
   SELEPAS fail ini, jadi satu kelas sahaja akan kalah. */
.app-halaman.buku-halaman { max-width: 1040px; }
.buku-halaman, .buku-halaman *, .buku-halaman *::before, .buku-halaman *::after { box-sizing: border-box; }

/* ---- Hero ---- */
.buku-hero {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: var(--tfd-space-7, 32px);
  align-items: start;
  padding: var(--tfd-space-3, 12px) 0 var(--tfd-space-7, 32px);
  border-bottom: 1px solid var(--tfd-line, #E5EAF0);
}
.buku-kulit { margin: 0; }
.buku-kulit img {
  display: block;
  width: 100%; height: auto;
  filter: drop-shadow(0 18px 28px rgba(15, 61, 94, .26)) drop-shadow(0 2px 6px rgba(15, 61, 94, .12));
}
.buku-kulit-lalai {
  width: 200px; height: 283px;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: var(--tfd-space-4, 16px);
  border-radius: var(--tfd-radius-sm, 8px);
  background: linear-gradient(160deg, #0F3D5E, #0B3350 60%, #1D4ED8);
  color: #fff;
  box-shadow: var(--tfd-elev-floating, 0 18px 44px rgba(15, 61, 94, .2));
  font-family: var(--tfd-font-ui, 'Plus Jakarta Sans', system-ui, sans-serif);
}
.buku-kulit-lalai span { font-weight: 800; font-size: 17px; line-height: 1.25; }
.buku-kulit-lalai small { margin-top: 4px; font-size: 11px; color: #C3D4E2; }
.buku-hero-teks { min-width: 0; }
.buku-tajuk {
  margin: 0;
  font-family: var(--tfd-font-formal, 'Source Serif 4', Georgia, serif);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--tfd-navy, #0F3D5E);
  text-wrap: balance;
}
.buku-subtajuk {
  margin: var(--tfd-space-1, 4px) 0 0;
  font-family: var(--tfd-font-formal, 'Source Serif 4', Georgia, serif);
  font-size: 1.05rem; font-style: italic;
  color: var(--tfd-text-muted, #6B7280);
}
.buku-meta { display: grid; gap: 3px; margin: var(--tfd-space-4, 16px) 0 0; font-size: .9rem; }
.buku-meta div { display: flex; gap: var(--tfd-space-2, 8px); }
.buku-meta dt { flex: 0 0 96px; color: var(--tfd-text-muted, #6B7280); }
.buku-meta dd { margin: 0; font-weight: 600; color: var(--tfd-text, #172033); }
.buku-huraian { margin: var(--tfd-space-4, 16px) 0 0; max-width: 62ch; font-size: .95rem; line-height: 1.6; color: #374151; }

/* ---- Katalog dan detail produk ---- */
.buku-katalog-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: var(--tfd-space-6, 24px);
  align-items: end;
  padding: var(--tfd-space-3, 12px) 0 var(--tfd-space-7, 32px);
  border-bottom: 1px solid var(--tfd-line, #E5EAF0);
}
.buku-cari {
  display: flex;
  gap: var(--tfd-space-2, 8px);
  padding: 6px;
  border: 1px solid var(--tfd-line, #E5EAF0);
  border-radius: var(--tfd-radius-lg, 16px);
  background: #fff;
  box-shadow: var(--tfd-elev-surface, 0 2px 8px rgba(15,61,94,.05));
}
.buku-cari input {
  min-width: 0;
  flex: 1 1 auto;
  border: 0;
  padding: 0 10px;
  color: var(--tfd-text, #172033);
  background: transparent;
}
.buku-cari input:focus { outline: none; }
.buku-cari:focus-within { outline: 2px solid var(--tfd-royal, #1D4ED8); outline-offset: 2px; }
.buku-cari button {
  min-height: 44px;
  padding: 0 16px;
  border: 0;
  border-radius: var(--tfd-radius-md, 12px);
  background: var(--tfd-navy, #0F3D5E);
  color: #fff;
  font: inherit;
  font-weight: 800;
}
.buku-section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--tfd-space-4, 16px);
  margin: var(--tfd-space-7, 32px) 0 var(--tfd-space-4, 16px);
}
.buku-section-head h2 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--tfd-navy, #0F3D5E);
}
.buku-section-head span { font-size: .84rem; font-weight: 700; color: var(--tfd-text-muted, #6B7280); }
.buku-katalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--tfd-space-4, 16px);
}
.buku-card {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
  border: 1px solid var(--tfd-line, #E5EAF0);
  border-radius: var(--tfd-radius-lg, 16px);
  background: #fff;
  box-shadow: var(--tfd-elev-surface, 0 2px 8px rgba(15,61,94,.05));
  overflow: hidden;
}
.buku-card-cover {
  display: grid;
  place-items: center;
  min-height: 250px;
  padding: var(--tfd-space-5, 20px);
  background: linear-gradient(180deg, #F4F8FC, #FFFFFF);
}
.buku-card-kulit { margin: 0; width: min(132px, 70%); }
.buku-card-kulit img { width: 100%; height: auto; filter: drop-shadow(0 12px 18px rgba(15, 61, 94, .2)); }
.buku-card-kulit .buku-kulit-lalai { width: 132px; height: 188px; }
.buku-card-body {
  display: flex;
  flex-direction: column;
  gap: var(--tfd-space-3, 12px);
  padding: var(--tfd-space-4, 16px);
}
.buku-card-body h2 { margin: 0; font-size: 1rem; line-height: 1.35; color: var(--tfd-navy, #0F3D5E); }
.buku-card-body h2 a { color: inherit; text-decoration: none; }
.buku-card-body h2 a:hover { text-decoration: underline; text-underline-offset: 3px; }
.buku-card-body p { margin: 0; font-size: .86rem; line-height: 1.5; color: var(--tfd-text-muted, #6B7280); }
.buku-card-meta { display: flex; align-items: center; justify-content: space-between; gap: var(--tfd-space-3, 12px); margin-top: auto; }
.buku-card-meta b { font-size: 1.05rem; color: var(--tfd-navy, #0F3D5E); }
.buku-card-meta span { font-size: .78rem; font-weight: 700; color: #2F7A4D; }
.buku-kosong {
  margin-top: var(--tfd-space-6, 24px);
  padding: var(--tfd-space-6, 24px);
  border: 1px solid var(--tfd-line, #E5EAF0);
  border-radius: var(--tfd-radius-lg, 16px);
  background: #fff;
}
.buku-kosong h2 { margin: 0 0 var(--tfd-space-2, 8px); color: var(--tfd-navy, #0F3D5E); }
.buku-kosong p { margin: 0; color: var(--tfd-text-muted, #6B7280); }
.buku-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--tfd-space-2, 8px);
  align-items: center;
  margin-bottom: var(--tfd-space-4, 16px);
  font-size: .84rem;
  color: var(--tfd-text-muted, #6B7280);
}
.buku-breadcrumb a { color: var(--tfd-royal, #1D4ED8); font-weight: 700; text-decoration: none; }
.buku-breadcrumb a:hover { text-decoration: underline; text-underline-offset: 3px; }
.buku-back-link svg { display: none; }
.buku-hero-detail { border-bottom: 0; }
.buku-buy-panel {
  display: grid;
  gap: var(--tfd-space-3, 12px);
  max-width: 320px;
  margin-top: var(--tfd-space-5, 20px);
  padding: var(--tfd-space-4, 16px);
  border: 1px solid var(--tfd-line, #E5EAF0);
  border-radius: var(--tfd-radius-lg, 16px);
  background: #fff;
}
/* Kongsi buku (assets/tfd-kongsi.js). Butang sekunder, sengaja lebih rendah
   daripada "Beli Sekarang" supaya tidak bersaing dengannya. */
.buku-kongsi {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--tfd-space-2, 8px);
  max-width: 320px;
  margin-top: var(--tfd-space-4, 16px);
}
.buku-kongsi-label { flex: 0 0 100%; font-size: .84rem; font-weight: 800; color: var(--tfd-text-muted, #6B7280); }
.buku-kongsi .app-btn { flex: 1 1 auto; }
.buku-price { font-size: 1.8rem; font-weight: 900; line-height: 1; color: var(--tfd-navy, #0F3D5E); }
.buku-stock { font-size: .84rem; font-weight: 800; }
.buku-stock.is-in { color: #2F7A4D; }
.buku-stock.is-out { color: #9C1E1E; }
.buku-info-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: var(--tfd-space-8, 40px);
  align-items: start;
  margin-top: var(--tfd-space-7, 32px);
}
.buku-info-main, .buku-info-side {
  min-width: 0;
  border-top: 1px solid var(--tfd-line, #E5EAF0);
  padding-top: var(--tfd-space-5, 20px);
}
.buku-info-main h2, .buku-info-side h2 {
  margin: var(--tfd-space-5, 20px) 0 var(--tfd-space-2, 8px);
  font-size: 1rem;
  color: var(--tfd-navy, #0F3D5E);
}
.buku-info-main h2:first-child, .buku-info-side h2:first-child { margin-top: 0; }
.buku-info-main p, .buku-info-side p {
  margin: 0;
  max-width: 70ch;
  font-size: .95rem;
  line-height: 1.7;
  color: #374151;
}
.buku-tier-list { list-style: none; margin: 0; padding: 0; }
.buku-tier-list li {
  display: flex;
  justify-content: space-between;
  gap: var(--tfd-space-3, 12px);
  padding: 9px 0;
  border-bottom: 1px solid #F1F4F8;
  font-size: .88rem;
}
.buku-tier-list li:last-child { border-bottom: 0; }
.buku-tier-list span { color: var(--tfd-text-muted, #6B7280); }
.buku-tier-list b { color: var(--tfd-navy, #0F3D5E); text-align: right; }
.buku-related { margin-top: var(--tfd-space-7, 32px); }
.buku-related-list { display: grid; gap: var(--tfd-space-2, 8px); }
.buku-related-list .app-list-row {
  min-height: 70px;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 18px;
  gap: var(--tfd-space-3, 12px);
  align-items: center;
  padding: 11px var(--tfd-space-4, 16px);
  border: 1px solid var(--tfd-line, #E5EAF0);
  border-radius: var(--tfd-radius-md, 12px);
  background: #fff;
  color: var(--tfd-text, #172033);
  text-decoration: none;
}
.buku-related-list .app-list-row:hover { border-color: var(--tfd-sky-line, #CFE0F5); background: var(--tfd-sky, #EAF4FF); }
.buku-related-list .app-list-row:focus-visible { outline: 2px solid var(--tfd-royal, #1D4ED8); outline-offset: 2px; }
.buku-related-list .app-list-icon {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: var(--tfd-radius-md, 12px);
  background: var(--tfd-sky, #EAF4FF);
  color: var(--tfd-navy, #0F3D5E);
}
.buku-related-list .app-list-icon svg { width: 19px; height: 19px; }
.buku-related-list .app-list-row strong { display: block; font-size: .9rem; line-height: 1.35; }
.buku-related-list .app-list-row small { display: block; margin-top: 3px; color: var(--tfd-text-muted, #6B7280); font-size: .78rem; line-height: 1.4; }
.buku-related-list .app-chevron { color: #8A94A3; }
.buku-related-list .app-chevron svg { width: 18px; height: 18px; }

/* Tier harga: butang, bukan hiasan. Tier semasa ditanda "Harga anda". */
.buku-tier {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--tfd-space-2, 8px);
  margin-top: var(--tfd-space-5, 20px);
}
.buku-tier-kad {
  position: relative;
  display: flex; flex-direction: column; align-items: flex-start; gap: 2px;
  padding: var(--tfd-space-3, 12px) var(--tfd-space-4, 16px);
  border: 1.5px solid var(--tfd-line, #E5EAF0);
  border-radius: var(--tfd-radius-md, 12px);
  background: #fff;
  font: inherit; text-align: left; cursor: pointer;
  color: var(--tfd-text, #172033);
  transition: border-color var(--tfd-dur-select, 160ms) var(--tfd-ease-out, ease), background var(--tfd-dur-select, 160ms) var(--tfd-ease-out, ease), box-shadow var(--tfd-dur-select, 160ms) var(--tfd-ease-out, ease);
}
.buku-tier-kad:hover { border-color: var(--tfd-sky-line, #CFE0F5); box-shadow: var(--tfd-elev-surface, 0 2px 8px rgba(15,61,94,.05)); }
.buku-tier-kad:focus-visible { outline: 2px solid var(--tfd-royal, #1D4ED8); outline-offset: 2px; }
.buku-tier-kad[aria-pressed="true"] { border-color: var(--tfd-royal, #1D4ED8); background: var(--tfd-sky, #EAF4FF); }
.buku-tier-harga { font-size: 1.25rem; font-weight: 800; color: var(--tfd-navy, #0F3D5E); line-height: 1.1; }
.buku-tier-harga small { margin-left: 2px; font-size: .75rem; font-weight: 600; color: var(--tfd-text-muted, #6B7280); }
.buku-tier-julat { font-size: .8rem; color: #374151; }
.buku-tier-label { font-size: .72rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--tfd-royal, #1D4ED8); }
.buku-tier-anda {
  position: absolute; top: -9px; right: 10px;
  padding: 2px 8px; border-radius: 999px;
  background: var(--tfd-royal, #1D4ED8); color: #fff;
  font-size: .68rem; font-weight: 700; letter-spacing: .02em;
  opacity: 0; transform: translateY(2px);
  transition: opacity var(--tfd-dur-select, 160ms) var(--tfd-ease-out, ease), transform var(--tfd-dur-select, 160ms) var(--tfd-ease-out, ease);
}
.buku-tier-kad[aria-pressed="true"] .buku-tier-anda { opacity: 1; transform: none; }

/* ---- Badan: borang + ringkasan ---- */
.buku-badan {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: var(--tfd-space-8, 40px);
  align-items: start;
  margin-top: var(--tfd-space-2, 8px);
}
.buku-borang { min-width: 0; }
.buku-langkah { padding: var(--tfd-space-6, 24px) 0 var(--tfd-space-3, 12px); border-bottom: 1px solid var(--tfd-line, #E5EAF0); }
.buku-langkah-akhir { border-bottom: 0; }
.buku-langkah-tajuk {
  display: flex; align-items: center; gap: var(--tfd-space-3, 12px);
  margin: 0 0 var(--tfd-space-4, 16px);
  font-family: var(--tfd-font-ui, 'Plus Jakarta Sans', system-ui, sans-serif);
  font-size: 1.05rem; font-weight: 800; color: var(--tfd-navy, #0F3D5E);
}
.buku-langkah-tajuk > span:first-child {
  display: inline-grid; place-items: center; flex: none;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--tfd-navy, #0F3D5E); color: #fff;
  font-size: .8rem; font-weight: 800;
}

/* Kuantiti */
.buku-qty { display: grid; grid-template-columns: 48px 96px 48px minmax(0, 1fr); gap: var(--tfd-space-2, 8px); align-items: center; }
.buku-qty-btn {
  height: 48px; border-radius: var(--tfd-radius-md, 12px);
  border: 1.5px solid var(--tfd-line, #E5EAF0); background: #fff;
  font-size: 22px; font-weight: 700; color: var(--tfd-navy, #0F3D5E); cursor: pointer;
  transition: background var(--tfd-dur-press, 100ms), border-color var(--tfd-dur-press, 100ms);
}
.buku-qty-btn:hover { background: var(--tfd-sky, #EAF4FF); border-color: var(--tfd-sky-line, #CFE0F5); }
.buku-qty-btn:active { background: var(--tfd-royal-soft, #DCE8FB); }
.buku-qty-btn:focus-visible { outline: 2px solid var(--tfd-royal, #1D4ED8); outline-offset: 2px; }
.buku-qty input {
  height: 48px; text-align: center; font-size: 1.25rem; font-weight: 800; color: var(--tfd-navy, #0F3D5E);
  border: 1.5px solid var(--tfd-line, #E5EAF0); border-radius: var(--tfd-radius-md, 12px); background: #fff;
  -moz-appearance: textfield; appearance: textfield;
}
.buku-qty input::-webkit-outer-spin-button, .buku-qty input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.buku-qty input:focus { outline: 2px solid var(--tfd-royal, #1D4ED8); outline-offset: 1px; border-color: var(--tfd-royal, #1D4ED8); }
.buku-qty-nota { margin: 0; padding-left: var(--tfd-space-2, 8px); font-size: .88rem; color: #374151; }
.buku-qty-nota b { color: var(--tfd-navy, #0F3D5E); }

/* Kad pilihan (radio) */
.buku-pilih { display: grid; grid-template-columns: 1fr 1fr; gap: var(--tfd-space-3, 12px); }
.buku-sumbangan { margin-top: var(--tfd-space-4, 16px); padding-top: var(--tfd-space-4, 16px); border-top: 1px dashed var(--tfd-line, #E5EAF0); }
.buku-pilih-kad { position: relative; display: block; cursor: pointer; }
.buku-pilih-kad input { position: absolute; opacity: 0; inset: 0; margin: 0; }
.buku-pilih-isi {
  display: block; height: 100%;
  padding: var(--tfd-space-3, 12px) var(--tfd-space-4, 16px) var(--tfd-space-3, 12px) 42px;
  border: 1.5px solid var(--tfd-line, #E5EAF0); border-radius: var(--tfd-radius-md, 12px); background: #fff;
  transition: border-color var(--tfd-dur-select, 160ms) var(--tfd-ease-out, ease), background var(--tfd-dur-select, 160ms) var(--tfd-ease-out, ease);
}
.buku-pilih-isi::before {
  content: ""; position: absolute; left: 14px; top: 15px;
  width: 18px; height: 18px; border-radius: 50%;
  border: 1.5px solid #B8C4D3; background: #fff;
  transition: border-color var(--tfd-dur-select, 160ms), box-shadow var(--tfd-dur-select, 160ms);
}
.buku-pilih-isi b { display: block; font-size: .95rem; color: var(--tfd-text, #172033); }
.buku-pilih-isi small { display: block; margin-top: 3px; font-size: .8rem; line-height: 1.45; color: #4B5563; }
.buku-pilih-kad:hover .buku-pilih-isi { border-color: var(--tfd-sky-line, #CFE0F5); }
.buku-pilih-kad input:checked + .buku-pilih-isi { border-color: var(--tfd-royal, #1D4ED8); background: var(--tfd-sky, #EAF4FF); }
.buku-pilih-kad input:checked + .buku-pilih-isi::before { border-color: var(--tfd-royal, #1D4ED8); border-width: 5px; }
.buku-pilih-kad input:focus-visible + .buku-pilih-isi { outline: 2px solid var(--tfd-royal, #1D4ED8); outline-offset: 2px; }

/* Medan */
.buku-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--tfd-space-3, 12px) var(--tfd-space-4, 16px); }
.buku-medan-penuh { grid-column: 1 / -1; }
.buku-medan label { display: block; margin: var(--tfd-space-2, 8px) 0 6px; font-size: .84rem; font-weight: 700; color: #374151; }
.buku-medan label span { margin-left: 4px; font-weight: 500; color: var(--tfd-text-muted, #6B7280); }
.buku-medan input, .buku-medan select, .buku-medan textarea {
  width: 100%; min-height: 48px; padding: 10px 14px;
  border: 1.5px solid var(--tfd-line, #E5EAF0); border-radius: var(--tfd-radius-md, 12px);
  font: inherit; font-size: 1rem; color: var(--tfd-text, #172033); background: #fff;
  transition: border-color var(--tfd-dur-select, 160ms), box-shadow var(--tfd-dur-select, 160ms);
}
.buku-medan input::placeholder, .buku-medan textarea::placeholder { color: #8A94A3; }
.buku-medan textarea { min-height: 72px; resize: vertical; line-height: 1.5; }
.buku-medan input:hover, .buku-medan select:hover, .buku-medan textarea:hover { border-color: #C9D4E1; }
.buku-medan input:focus, .buku-medan select:focus, .buku-medan textarea:focus {
  outline: none; border-color: var(--tfd-royal, #1D4ED8);
  box-shadow: 0 0 0 3px var(--tfd-royal-soft, #DCE8FB);
}
.buku-medan select {
  appearance: none; -webkit-appearance: none; padding-right: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230F3D5E' stroke-width='1.7' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center; background-size: 18px;
}
.buku-kaki { margin: var(--tfd-space-2, 8px) 0 0; font-size: .8rem; line-height: 1.5; color: var(--tfd-text-muted, #6B7280); }
.buku-kaki a { color: var(--tfd-royal, #1D4ED8); font-weight: 600; }

/* Huruf besar automatik — nama/alamat/bandar akan tercetak pada label
   kurier, bukan e-mel/telefon/poskod/negeri. Placeholder kekal huruf biasa
   supaya kekal senang dibaca sebagai petunjuk, bukan nilai. */
#bukuNama, #bukuAtasNama, #bukuAddr1, #bukuAddr2, #bukuBandar { text-transform: uppercase; }
#bukuNama::placeholder, #bukuAtasNama::placeholder, #bukuAddr1::placeholder, #bukuAddr2::placeholder, #bukuBandar::placeholder { text-transform: none; }

/* Ralat per-medan (papar semasa blur, bukan tunggu submit) */
.buku-medan-ralat { margin: 6px 0 0; font-size: .8rem; line-height: 1.4; color: #9C1E1E; }
.buku-medan--invalid input, .buku-medan--invalid select { border-color: #E06666; }
.buku-medan--invalid input:focus, .buku-medan--invalid select:focus { box-shadow: 0 0 0 3px #FBE2E2; }

/* Ringkasan (melekat pada desktop) */
.buku-ringkasan {
  position: sticky; top: 88px;
  margin-top: var(--tfd-space-6, 24px);
  padding: var(--tfd-space-5, 20px);
  border-radius: var(--tfd-radius-lg, 16px);
  background: var(--tfd-navy, #0F3D5E);
  color: #fff;
  box-shadow: var(--tfd-elev-interactive, 0 6px 18px rgba(15, 61, 94, .1));
}
.buku-ringkasan-tajuk { margin: 0 0 var(--tfd-space-3, 12px); font-size: .8rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: #9FB8CC; }
.buku-ringkasan-senarai { margin: 0; }
.buku-ringkasan-senarai div { display: flex; justify-content: space-between; align-items: baseline; gap: var(--tfd-space-3, 12px); padding: 6px 0; font-size: .92rem; }
.buku-ringkasan-senarai dt { color: #C3D4E2; }
.buku-ringkasan-senarai dd { margin: 0; text-align: right; font-weight: 600; }
.buku-ringkasan-senarai dd.buku-pos-tunggu { font-weight: 500; font-size: .82rem; color: #C3D4E2; }
.buku-ringkasan-jumlah { margin-top: var(--tfd-space-2, 8px); padding-top: var(--tfd-space-3, 12px) !important; border-top: 1px solid rgba(255, 255, 255, .18); }
.buku-ringkasan-jumlah dt { color: #fff; font-weight: 700; font-size: 1rem; }
.buku-ringkasan-jumlah dd { font-size: 1.55rem; font-weight: 800; letter-spacing: -.01em; }
.buku-ringkasan-senarai dd small { display: block; font-size: .72rem; font-weight: 500; color: #C3D4E2; letter-spacing: 0; }
.buku-hantar { margin-top: var(--tfd-space-4, 16px); min-height: 52px; font-size: 1rem; }
.buku-hantar:disabled { opacity: .55; cursor: not-allowed; filter: none; }
.buku-hantar:not(:disabled):hover { filter: brightness(1.05); }
.buku-hantar:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.buku-ringkasan-kaki { color: #9FB8CC; }
.buku-ringkasan-kaki a { color: #fff; }

.buku-nudge {
  margin: var(--tfd-space-3, 12px) 0 0; padding: 10px 12px;
  border-radius: var(--tfd-radius-sm, 8px);
  background: var(--tfd-gold-soft, #FFF4D9); color: var(--tfd-gold-ink, #7A570B);
  font-size: .84rem; line-height: 1.5;
}
.buku-nudge button {
  display: inline-block; margin-top: 6px; padding: 6px 12px; border-radius: 999px;
  border: 0; background: var(--tfd-gold, #E7B43C); color: #2B1F05;
  font: inherit; font-size: .82rem; font-weight: 700; cursor: pointer;
}
.buku-nudge button:hover { filter: brightness(1.05); }
.buku-nudge button:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }

.buku-ralat {
  margin-top: var(--tfd-space-3, 12px); padding: 10px 12px;
  border-radius: var(--tfd-radius-sm, 8px); background: #FDECEC; border: 1px solid #F5B5B5;
  font-size: .88rem; line-height: 1.5; color: #9C1E1E;
}
.buku-ralat a { color: inherit; font-weight: 700; }

/* Bar melekat telefon */
.buku-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between; gap: var(--tfd-space-3, 12px);
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom, 0px));
  background: rgba(255, 255, 255, .96);
  border-top: 1px solid var(--tfd-line, #E5EAF0);
  box-shadow: 0 -8px 24px rgba(15, 61, 94, .08);
}
.buku-bar[hidden] { display: none; }
.buku-bar-teks { display: flex; flex-direction: column; line-height: 1.15; }
.buku-bar-teks small { font-size: .72rem; color: var(--tfd-text-muted, #6B7280); }
.buku-bar-teks b { font-size: 1.15rem; font-weight: 800; color: var(--tfd-navy, #0F3D5E); }
.buku-bar-btn { min-height: 44px; padding: 0 22px; }

/* ---- Resit ---- */
.buku-resit-jenis { margin: 0; font-size: .84rem; font-weight: 700; color: var(--tfd-text-muted, #6B7280); }
.buku-resit-status {
  display: inline-flex; align-items: center; gap: 8px;
  margin: var(--tfd-space-3, 12px) 0 0; padding: 7px 12px; border-radius: 999px;
  background: #E8F3E7; color: #216B2C; font-weight: 800; font-size: .82rem;
}
.buku-resit-status.menunggu { background: var(--tfd-gold-soft, #FFF4D9); color: var(--tfd-gold-ink, #7A570B); }
.buku-resit-status.gagal { background: #FDECEC; color: #9C1E1E; }
.buku-resit-status.hantar { background: var(--tfd-sky, #EAF4FF); color: var(--tfd-royal, #1D4ED8); }
.buku-resit-blok { margin-top: var(--tfd-space-4, 16px); padding: var(--tfd-space-4, 16px) var(--tfd-space-5, 20px); border: 1px solid var(--tfd-line, #E5EAF0); border-radius: var(--tfd-radius-lg, 16px); background: #fff; }
.buku-resit-blok h2 { margin: 0 0 var(--tfd-space-2, 8px); font-size: .78rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--tfd-text-muted, #6B7280); }
.buku-resit-baris { display: flex; justify-content: space-between; gap: var(--tfd-space-4, 16px); padding: 8px 0; border-bottom: 1px solid #F1F4F8; font-size: .92rem; }
.buku-resit-baris:last-child { border-bottom: 0; }
.buku-resit-baris span:first-child { color: var(--tfd-text-muted, #6B7280); flex: 0 0 auto; }
.buku-resit-baris b { text-align: right; font-weight: 600; }
.buku-resit-aksi { display: flex; flex-wrap: wrap; gap: var(--tfd-space-3, 12px); margin-top: var(--tfd-space-5, 20px); }
.buku-resit-aksi .app-btn { flex: 1 1 auto; }
.buku-resit-aksi .app-btn-kedua { background: #fff; color: var(--tfd-navy, #0F3D5E); border-color: var(--tfd-line, #E5EAF0); }
.buku-resit-jejak { margin: 0; padding: 0; list-style: none; }
.buku-resit-jejak li { display: flex; gap: var(--tfd-space-3, 12px); padding: 6px 0; font-size: .88rem; }
.buku-resit-jejak li small { color: var(--tfd-text-muted, #6B7280); min-width: 120px; }

/* ---- Responsif ---- */
@media (max-width: 899px) {
  .buku-katalog-hero, .buku-info-grid { grid-template-columns: minmax(0, 1fr); gap: var(--tfd-space-4, 16px); }
  .buku-buy-panel { max-width: none; }
  .buku-badan { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .buku-ringkasan { position: static; margin-top: var(--tfd-space-5, 20px); }
  .buku-halaman { padding-bottom: 96px; } /* ruang untuk bar melekat */
}
@media (min-width: 900px) {
  .buku-bar { display: none !important; }
}
@media (max-width: 600px) {
  .buku-cari { align-items: stretch; }
  .buku-cari button { padding-inline: 12px; }
  .buku-section-head { align-items: start; flex-direction: column; gap: 2px; }
  .buku-katalog-grid { grid-template-columns: minmax(0, 1fr); }
  .buku-card { grid-template-columns: 104px minmax(0, 1fr); grid-template-rows: auto; }
  .buku-card-cover { min-height: 0; padding: 14px 10px; }
  .buku-card-kulit { width: 78px; }
  .buku-card-kulit .buku-kulit-lalai { width: 78px; height: 111px; padding: 10px; }
  .buku-card-body { padding: 14px; }
  .buku-card-meta { align-items: flex-start; flex-direction: column; gap: 0; }
  .buku-hero { grid-template-columns: 124px minmax(0, 1fr); gap: var(--tfd-space-4, 16px); padding-bottom: var(--tfd-space-5, 20px); }
  .buku-kulit-lalai { width: 124px; height: 176px; }
  .buku-meta dt { flex-basis: 84px; }
  /* Teks hero menjadi item grid terus supaya tier boleh turun ke lebar penuh
     di bawah kulit; kulit merentang empat baris teks di sebelahnya. */
  .buku-hero-teks { display: contents; }
  .buku-hero-teks > * { grid-column: 2; }
  .buku-hero-detail .buku-buy-panel { grid-column: 1 / -1; }
  .buku-kulit { grid-row: 1 / span 4; }
  /* Satu baris setiap tier: harga | julat | lencana. Label "Pakej" disorok —
     julat sudah memadai, dan nama pakej muncul di nota kuantiti serta ringkasan. */
  .buku-tier { grid-column: 1 / -1; grid-template-columns: minmax(0, 1fr); gap: var(--tfd-space-2, 8px); margin-top: var(--tfd-space-3, 12px); }
  .buku-tier-kad { display: grid; grid-template-columns: 100px minmax(0, 1fr) auto; align-items: center; gap: var(--tfd-space-3, 12px); padding: 10px 14px; }
  .buku-tier-label { display: none; }
  .buku-tier-anda { position: static; display: none; transform: none; }
  .buku-tier-kad[aria-pressed="true"] .buku-tier-anda { display: inline-block; transform: none; }
  .buku-qty { grid-template-columns: 48px 88px 48px; }
  .buku-qty-nota { grid-column: 1 / -1; padding-left: 0; }
  .buku-pilih { grid-template-columns: 1fr; }
  .buku-grid { grid-template-columns: 1fr; }
  .buku-medan-penuh { grid-column: auto; }

  /* ---- Halaman produk (bukan checkout): kad tertengah, bukan bersebelahan ----
     Kulit 124px bersebelahan teks (peraturan .buku-hero generik di atas) terlalu
     sempit sebagai hero produk. Di bawah 600px, halaman detail sahaja menyusun
     menegak: kulit besar tertengah di atas, tajuk/pengarang tertengah, jalur
     statistik (Karya/Terjemahan/Format) macam kad, kemudian panel beli — corak
     "gambar besar di atas, penerangan di bawah" yang biasa pada apl kedai buku. */
  .buku-hero-detail { grid-template-columns: minmax(0, 1fr); justify-items: center; text-align: center; }
  .buku-hero-detail .buku-kulit { grid-row: auto; width: min(230px, 66%); }
  .buku-hero-detail .buku-hero-teks { display: block; width: 100%; }
  .buku-hero-detail .buku-hero-teks > * { grid-column: auto; }
  .buku-hero-detail .buku-tajuk, .buku-hero-detail .buku-subtajuk { text-align: center; }
  .buku-hero-detail .buku-meta {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(84px, 1fr)); gap: 1px;
    margin: var(--tfd-space-5, 20px) 0 0;
    border: 1px solid var(--tfd-line, #E5EAF0); border-radius: var(--tfd-radius-md, 12px);
    background: var(--tfd-line, #E5EAF0); overflow: hidden;
  }
  .buku-hero-detail .buku-meta div {
    flex-direction: column; align-items: center; justify-content: center; gap: 3px;
    padding: var(--tfd-space-3, 12px) var(--tfd-space-2, 8px);
    background: #fff;
  }
  .buku-hero-detail .buku-meta dt { flex: none; font-size: .66rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; }
  .buku-hero-detail .buku-meta dd { font-size: .86rem; text-align: center; }
  .buku-hero-detail .buku-buy-panel,
  .buku-hero-detail .buku-kongsi,
  .buku-hero-detail .buku-app-nudge {
    max-width: 360px; margin-left: auto; margin-right: auto; text-align: left;
  }
}

/* Susunan kedai buku untuk telefon. Diletakkan selepas aturan responsif generik
   supaya checkout mengekalkan susunannya, manakala katalog dan detail menerima
   pengalaman khusus tanpa menukar tablet atau desktop. */
@media (max-width: 600px) {
  /* Katalog: hanya rak buku boleh dileret; halaman tidak melimpah ke sisi. */
  .buku-katalog { overflow: hidden; }
  .buku-katalog-hero { padding-top: var(--tfd-space-2, 8px); padding-bottom: var(--tfd-space-5, 20px); }
  .buku-katalog-hero .buku-huraian { margin-top: var(--tfd-space-2, 8px); }
  .buku-katalog .buku-cari { width: 100%; margin-top: var(--tfd-space-2, 8px); }
  .buku-katalog .buku-cari input { min-height: 44px; font-size: 1rem; }
  .buku-katalog .buku-cari button { min-width: 68px; }
  .buku-katalog .buku-section-head { flex-direction: row; align-items: end; margin-bottom: var(--tfd-space-3, 12px); }
  .buku-katalog-grid {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: clamp(154px, 43vw, 190px);
    gap: var(--tfd-space-4, 16px);
    margin-inline: -16px;
    padding: 4px 16px 18px;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scroll-padding-inline: 16px;
    scroll-snap-type: inline mandatory;
    scrollbar-width: none;
  }
  .buku-katalog-grid::-webkit-scrollbar { display: none; }
  .buku-katalog-grid .buku-card {
    display: flex; flex-direction: column;
    border: 0; border-radius: 0; background: transparent; box-shadow: none; overflow: visible;
    scroll-snap-align: start;
  }
  .buku-katalog-grid .buku-card-cover {
    min-height: 0; aspect-ratio: 2 / 3; padding: 14px 12px;
    border-radius: var(--tfd-radius-lg, 16px);
    background: var(--tfd-sky, #EAF4FF);
  }
  .buku-katalog-grid .buku-card-kulit { width: min(128px, 86%); }
  .buku-katalog-grid .buku-card-kulit img { max-height: 218px; object-fit: contain; }
  .buku-katalog-grid .buku-card-kulit .buku-kulit-lalai { width: 100%; height: auto; aspect-ratio: 200 / 283; padding: 12px; }
  .buku-katalog-grid .buku-card-body { gap: 7px; padding: 10px 2px 0; }
  .buku-katalog-grid .buku-card-body h2 { font-size: .92rem; }
  .buku-katalog-grid .buku-card-body h2 a { min-height: 44px; display: flex; align-items: start; }
  .buku-katalog-grid .buku-card-body p { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }
  .buku-katalog-grid .buku-card-meta { align-items: flex-start; flex-direction: column; gap: 0; }
  .buku-katalog-grid .buku-card-body > .app-btn { display: none; }

  /* Detail: kawalan kembali dan hero menjadi satu permukaan navy penuh. */
  .buku-detail { display: flex; flex-direction: column; overflow: hidden; }
  .buku-detail > .buku-breadcrumb { order: 0; }
  .buku-detail > .buku-hero-detail { order: 1; }
  .buku-detail > .buku-bar { order: 2; }
  .buku-detail > .buku-info-grid { order: 3; }
  .buku-detail > .buku-cara { order: 4; }
  .buku-detail > .buku-related { order: 5; }
  .buku-detail .buku-breadcrumb {
    margin: 0 -16px; padding: 10px 16px 6px;
    flex-wrap: nowrap; background: var(--tfd-navy, #0F3D5E); color: #fff;
  }
  .buku-detail .buku-back-link {
    min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; gap: 8px;
    color: #fff; border-radius: var(--tfd-radius-md, 12px);
  }
  .buku-detail .buku-back-link:hover { color: #fff; text-decoration: none; background: rgba(255,255,255,.1); }
  .buku-detail .buku-back-link svg { display: block; width: 20px; height: 20px; flex: none; }
  .buku-detail .buku-breadcrumb-pemisah,
  .buku-detail .buku-breadcrumb-semasa { display: none; }
  .buku-hero-detail {
    grid-template-columns: minmax(0, 1fr); justify-items: center; gap: var(--tfd-space-5, 20px);
    margin: 0 -16px; padding: var(--tfd-space-3, 12px) 16px var(--tfd-space-7, 32px);
    border: 0; background: var(--tfd-navy, #0F3D5E); text-align: center;
  }
  .buku-hero-detail .buku-kulit { grid-row: auto; width: min(210px, 58vw); }
  .buku-hero-detail .buku-kulit img { filter: drop-shadow(0 20px 28px rgba(0, 20, 40, .36)); }
  .buku-hero-detail .buku-kulit-lalai { width: 100%; height: auto; aspect-ratio: 200 / 283; }
  .buku-hero-detail .buku-hero-teks { display: block; width: 100%; }
  .buku-hero-detail .buku-hero-teks > * { grid-column: auto; }
  .buku-hero-detail .buku-tajuk { color: #fff; font-size: clamp(1.65rem, 8vw, 2.15rem); text-align: center; }
  .buku-hero-detail .buku-subtajuk { color: #C3D4E2; text-align: center; }
  .buku-hero-detail .buku-meta {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(68px, 1fr)); gap: 0;
    margin: var(--tfd-space-5, 20px) 0 0;
    border-block: 1px solid rgba(255,255,255,.2); background: transparent; overflow: hidden;
  }
  .buku-hero-detail .buku-meta div {
    min-width: 0; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
    padding: var(--tfd-space-3, 12px) 6px;
    border-right: 1px solid rgba(255,255,255,.16); background: transparent;
  }
  .buku-hero-detail .buku-meta div:last-child { border-right: 0; }
  .buku-hero-detail .buku-meta dt { flex: none; color: #F6D78D; font-size: .64rem; font-weight: 800; text-transform: uppercase; letter-spacing: .04em; }
  .buku-hero-detail .buku-meta dd { color: #fff; font-size: .75rem; line-height: 1.35; text-align: center; overflow-wrap: anywhere; }
  .buku-hero-detail .buku-buy-panel {
    width: 100%; max-width: 360px;
    grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 10px 12px;
    margin: var(--tfd-space-5, 20px) auto 0; padding: var(--tfd-space-4, 16px);
    border: 0; box-shadow: 0 16px 34px rgba(0, 20, 40, .22); text-align: left;
  }
  .buku-hero-detail .buku-buy-panel > p,
  .buku-hero-detail .buku-buy-panel > .app-btn,
  .buku-hero-detail .buku-amanah { grid-column: 1 / -1; }
  .buku-hero-detail .buku-stock { justify-self: end; text-align: right; }
  .buku-hero-detail .buku-kongsi,
  .buku-hero-detail .buku-app-nudge { width: 100%; max-width: 360px; margin-left: auto; margin-right: auto; text-align: left; }
  .buku-hero-detail .buku-kongsi-label { color: #C3D4E2; }
  .buku-hero-detail .buku-app-nudge { background: rgba(255,255,255,.1); color: #fff; }
  .buku-hero-detail .buku-app-nudge svg { color: #F6D78D; }

  /* Kandungan bacaan mendahului maklumat sokongan dan langkah pembelian. */
  .buku-detail .buku-info-grid { margin-top: 0; gap: 0; }
  .buku-detail .buku-info-main { border-top: 0; padding-top: var(--tfd-space-7, 32px); }
  .buku-detail .buku-info-side { margin-top: var(--tfd-space-6, 24px); }
  .buku-detail .buku-info-main h2,
  .buku-detail .buku-info-side h2 { font-size: 1.1rem; }
  .buku-detail .buku-info-main p,
  .buku-detail .buku-info-side p { font-size: 1rem; }
  .buku-detail .buku-cara,
  .buku-detail .buku-related { margin-top: var(--tfd-space-7, 32px); }
  .buku-detail .buku-bar {
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
  }
}

@media (max-width: 340px) {
  .buku-hero { grid-template-columns: minmax(0, 1fr); }
  .buku-hero-teks > * { grid-column: 1; }
  .buku-kulit { grid-row: auto; max-width: 150px; }
}
@media (prefers-reduced-motion: reduce) {
  .buku-tier-kad, .buku-tier-anda, .buku-pilih-isi, .buku-pilih-isi::before, .buku-qty-btn, .buku-medan input, .buku-medan select, .buku-medan textarea { transition: none; }
}

/* Kadar pos ikut zon pada halaman produk (sepadan buku_skema_penghantaran()). */
.buku-pos-zon { margin: var(--tfd-space-3, 12px) 0 var(--tfd-space-1, 4px); font-size: .9rem; font-weight: 800; color: var(--tfd-navy, #0F3D5E); }

/* ---- Jalur amanah dalam buy panel: bayaran selamat, pos, bukti sosial sebenar ---- */
.buku-amanah { list-style: none; margin: var(--tfd-space-3, 12px) 0 0; padding: var(--tfd-space-3, 12px) 0 0; border-top: 1px dashed var(--tfd-line, #E5EAF0); display: grid; gap: 7px; }
.buku-amanah li { display: flex; align-items: center; gap: 8px; font-size: .82rem; font-weight: 600; color: #374151; }
.buku-amanah li svg { flex: none; width: 18px; height: 18px; color: var(--tfd-royal, #1D4ED8); }

/* ---- Nudge pasang app (produk): sebaris, tidak bersaing dengan CTA Beli ---- */
.buku-app-nudge {
  display: flex; align-items: center; flex-wrap: wrap; gap: 10px;
  max-width: 320px;
  margin: var(--tfd-space-4, 16px) 0 0;
  padding: 10px 14px;
  border-radius: var(--tfd-radius-md, 12px);
  background: var(--tfd-sky, #EAF4FF);
  color: var(--tfd-navy, #0F3D5E);
  font-size: .84rem; font-weight: 600; line-height: 1.4;
}
.buku-app-nudge[hidden] { display: none; }
.buku-app-nudge svg { flex: none; width: 20px; height: 20px; color: var(--tfd-royal, #1D4ED8); }
.buku-app-nudge button {
  margin-left: auto; padding: 8px 16px; min-height: 44px;
  border: 0; border-radius: 999px;
  background: var(--tfd-royal, #1D4ED8); color: #fff;
  font: inherit; font-size: .8rem; font-weight: 800; cursor: pointer;
}
.buku-app-nudge button:hover { filter: brightness(1.05); }
.buku-app-nudge button:focus-visible { outline: 2px solid var(--tfd-navy, #0F3D5E); outline-offset: 2px; }
.buku-app-nudge button[hidden] { display: none; }
/* Elak kelipan bila JS lengai/gagal: sudah berjalan sebagai app -> kekal tersembunyi. */
.pwa-standalone .buku-app-nudge, .pwa-standalone .buku-lestari-kad[data-pasang] { display: none !important; }

/* ---- Cara Membeli: panduan 3 langkah untuk pembeli pertama kali online ---- */
.buku-cara { margin-top: var(--tfd-space-7, 32px); padding-top: var(--tfd-space-6, 24px); border-top: 1px solid var(--tfd-line, #E5EAF0); }
.buku-cara-list {
  list-style: none; margin: var(--tfd-space-2, 8px) 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--tfd-space-6, 24px);
}
.buku-cara-list li { display: flex; flex-direction: column; gap: 6px; }
.buku-cara-no {
  display: inline-grid; place-items: center; flex: none;
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--tfd-navy, #0F3D5E); color: #fff;
  font-size: .86rem; font-weight: 800;
}
.buku-cara-list b { margin-top: 4px; font-size: .95rem; color: var(--tfd-navy, #0F3D5E); }
.buku-cara-list p { margin: 0; font-size: .84rem; line-height: 1.55; color: #4B5563; }

/* ---- Resit: kad "Pasang App" / "Daftar akaun" selepas pembelian berjaya ---- */
.buku-lestari { display: grid; gap: var(--tfd-space-3, 12px); margin-top: var(--tfd-space-5, 20px); }
.buku-lestari-kad {
  display: grid; grid-template-columns: 40px minmax(0, 1fr) auto; align-items: center; gap: var(--tfd-space-3, 12px);
  padding: var(--tfd-space-4, 16px); border: 1px solid var(--tfd-line, #E5EAF0); border-radius: var(--tfd-radius-lg, 16px);
  background: #fff;
}
.buku-lestari-kad[hidden] { display: none; }
.buku-lestari-ikon {
  display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 50%;
  background: var(--tfd-sky, #EAF4FF); color: var(--tfd-royal, #1D4ED8);
}
.buku-lestari-ikon svg { width: 22px; height: 22px; }
.buku-lestari-teks { min-width: 0; }
.buku-lestari-teks b { display: block; font-size: .95rem; color: var(--tfd-navy, #0F3D5E); }
.buku-lestari-teks p { margin: 3px 0 0; font-size: .82rem; line-height: 1.5; color: #4B5563; }
.buku-lestari-teks p[hidden] { display: none; }
.buku-lestari-kad .app-btn { flex: none; white-space: nowrap; }

@media (max-width: 899px) {
  .buku-cara-list { grid-template-columns: minmax(0, 1fr); gap: var(--tfd-space-4, 16px); }
}
@media (max-width: 600px) {
  .buku-app-nudge { max-width: none; }
  .buku-lestari-kad { grid-template-columns: 32px minmax(0, 1fr); }
  .buku-lestari-ikon { width: 32px; height: 32px; }
  .buku-lestari-ikon svg { width: 18px; height: 18px; }
  .buku-lestari-kad .app-btn { grid-column: 1 / -1; margin-top: 4px; width: 100%; text-align: center; }
}