/* Pustaka Neraca Tegak. Satu lembar gaya, tanpa skrip, tanpa fon eksternal. */
:root {
  --kertas: #f5f0e6;
  --kertas-2: #ece4d4;
  --kartu: #fbf8f2;
  --tinta: #1b2528;
  --tinta-2: #4b5557;
  --aksen: #8a5a1c;
  --aksen-latar: #b98535;
  --garis: #d6cbb5;
  --bayang: 0 1px 2px rgb(27 37 40 / 6%), 0 8px 24px rgb(27 37 40 / 8%);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", "URW Palladio L", P052, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --lebar: 72rem;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --kertas: #121a1c;
    --kertas-2: #182225;
    --kartu: #1c272a;
    --tinta: #ece5d6;
    --tinta-2: #b4ac9c;
    --aksen: #e0ad62;
    --aksen-latar: #c9944a;
    --garis: #2e3b3e;
    --bayang: 0 1px 2px rgb(0 0 0 / 30%), 0 8px 24px rgb(0 0 0 / 30%);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0;
  background: var(--kertas);
  color: var(--tinta);
  font: 1.0625rem/1.65 var(--sans);
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--aksen); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--aksen); outline-offset: 3px; border-radius: 3px; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.15; margin: 0; text-wrap: balance; }
p { margin: 0 0 1rem; }

.wadah { width: min(100% - 2rem, var(--lebar)); margin-inline: auto; }

.lompat { position: absolute; left: 1rem; top: -4rem; background: var(--tinta); color: var(--kertas); padding: .5rem .9rem; border-radius: 6px; z-index: 10; }
.lompat:focus { top: 1rem; }

/* Kepala */
.kepala {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--kertas) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--garis);
}
.kepala-dalam { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 3.75rem; }
.merek { display: inline-flex; align-items: center; gap: .6rem; color: var(--tinta); text-decoration: none; font-family: var(--serif); font-weight: 600; font-size: 1.08rem; }
.merek-tanda { width: 1.6rem; height: 1.6rem; color: var(--aksen); }
.kepala nav { display: flex; gap: 1.25rem; }
.kepala nav a { color: var(--tinta-2); text-decoration: none; font-size: .95rem; }
.kepala nav a:hover { color: var(--tinta); }
@media (max-width: 40rem) {
  .merek span { font-size: .98rem; }
  .kepala nav { gap: .9rem; }
  .kepala nav a { font-size: .88rem; }
}
@media (max-width: 26rem) { .merek span { display: none; } }

/* Pembuka */
.pembuka { padding: clamp(3rem, 8vw, 6.5rem) 0 clamp(2.5rem, 6vw, 4.5rem); border-bottom: 1px solid var(--garis); }
.pembuka-dalam { display: grid; gap: 2.5rem; align-items: center; }
@media (min-width: 52rem) { .pembuka-dalam { grid-template-columns: 1.35fr 1fr; gap: 4rem; } }
.label { font-size: .82rem; letter-spacing: .08em; text-transform: uppercase; color: var(--tinta-2); margin-bottom: 1rem; }
.pembuka h1 { font-size: clamp(2.5rem, 6.4vw, 4.4rem); letter-spacing: -.01em; margin-bottom: 1.4rem; }
.lead { font-size: clamp(1.12rem, 1.9vw, 1.28rem); line-height: 1.6; max-width: 38em; }
.pembuka-teks > p:not(.label) { max-width: 38em; }

.angka { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; margin: 2rem 0 0; border-top: 1px solid var(--garis); max-width: 34rem; }
.angka div { display: flex; flex-direction: column-reverse; justify-content: flex-end; padding: 1rem 1rem 0 0; }
.angka div + div { padding-left: 1rem; border-left: 1px solid var(--garis); }
.angka dd { margin: 0; font-family: var(--serif); font-size: clamp(2rem, 4vw, 2.6rem); line-height: 1; color: var(--aksen); }
.angka dt { font-size: .86rem; line-height: 1.35; color: var(--tinta-2); margin-top: .45rem; }

.pembuka-gambar { margin: 0; justify-self: center; width: min(100%, 22rem); }
@media (max-width: 51.99rem) { .pembuka-gambar { width: min(70%, 15rem); order: -1; } }
.neraca { color: var(--tinta); overflow: visible; }
.neraca-isi { fill: var(--aksen-latar); opacity: .9; }
.neraca-aksen { stroke: var(--aksen-latar); }
.neraca-poros { fill: var(--kertas); stroke: var(--aksen-latar); stroke-width: 3; }

/* Bagian */
.bagian { padding: clamp(3rem, 7vw, 5.5rem) 0; scroll-margin-top: 3.5rem; }
.bagian-lembut { background: var(--kertas-2); border-block: 1px solid var(--garis); }
.bagian h2 { font-size: clamp(1.9rem, 3.6vw, 2.6rem); margin-bottom: 1rem; }
.pengantar { color: var(--tinta-2); max-width: 44em; }
.subjudul { font-size: 1.35rem; margin: 2.75rem 0 .6rem; padding-top: 1.25rem; border-top: 1px solid var(--garis); }

/* Rak buku */
.rak { list-style: none; padding: 0; margin: 1.5rem 0 0; display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); }
.kartu { display: flex; flex-direction: column; height: 100%; background: var(--kartu); border: 1px solid var(--garis); border-radius: 14px; overflow: hidden; color: var(--tinta); text-decoration: none; box-shadow: var(--bayang); transition: transform .18s ease, border-color .18s ease; }
.kartu:hover { transform: translateY(-3px); border-color: var(--aksen-latar); }
.kartu img { width: 100%; height: auto; aspect-ratio: 1440 / 756; object-fit: cover; background: var(--kertas-2); border-bottom: 1px solid var(--garis); }
.kartu-isi { display: flex; flex-direction: column; gap: .5rem; padding: 1rem 1.1rem 1.15rem; flex: 1; }
.kartu-judul { font-family: var(--serif); font-size: 1.2rem; font-weight: 600; line-height: 1.25; }
.kartu-ringkas { font-size: .95rem; line-height: 1.5; color: var(--tinta-2); flex: 1; }
.kartu-domain { font-size: .85rem; color: var(--aksen); }
/* Panah hiasan: teks alternatif kosong agar tak dibacakan; deklarasi pertama cadangan peramban lama. */
.kartu-domain::after { content: " ↗"; content: " ↗" / ""; }
@media (prefers-reduced-motion: reduce) { .kartu { transition: none; } .kartu:hover { transform: none; } }

/* Pegangan */
.pegangan { list-style: none; padding: 0; margin: 2rem 0 0; display: grid; gap: 1.25rem; counter-reset: pegangan; }
@media (min-width: 50rem) { .pegangan { grid-template-columns: repeat(3, 1fr); } }
.pegangan li { counter-increment: pegangan; background: var(--kartu); border: 1px solid var(--garis); border-radius: 14px; padding: 1.4rem 1.4rem .6rem; }
.pegangan li::before { content: counter(pegangan, upper-roman); display: block; font-family: var(--serif); color: var(--aksen); font-size: 1.05rem; letter-spacing: .06em; margin-bottom: .6rem; }
.pegangan h3 { font-size: 1.25rem; margin-bottom: .6rem; }
.pegangan p { color: var(--tinta-2); font-size: .98rem; }

/* Identitas */
.identitas { display: grid; gap: 2rem; align-items: start; }
@media (min-width: 56rem) { .identitas { grid-template-columns: 1.4fr 1fr; gap: 3rem; } }
.kolofon { background: var(--kartu); border: 1px solid var(--garis); border-top: 4px double var(--aksen-latar); border-radius: 4px 4px 14px 14px; padding: clamp(1.4rem, 4vw, 2.4rem); box-shadow: var(--bayang); }
.kolofon h2 { margin-bottom: 1.4rem; }
.kolofon dl { display: grid; grid-template-columns: max-content 1fr; gap: .7rem 1.5rem; margin: 0; font-family: var(--serif); font-size: 1.05rem; }
.kolofon dt { color: var(--tinta-2); font-family: var(--sans); font-size: .82rem; letter-spacing: .05em; text-transform: uppercase; padding-top: .2rem; }
.kolofon dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 30rem) { .kolofon dl { grid-template-columns: 1fr; gap: .15rem; } .kolofon dd { margin-bottom: .7rem; } }
.data-mesin h3 { font-size: 1.25rem; margin-bottom: .6rem; }
.data-mesin p { color: var(--tinta-2); font-size: .98rem; }
.data-mesin ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .75rem; }
.data-mesin li { display: grid; gap: .1rem; padding: .75rem 0; border-top: 1px solid var(--garis); }
.data-mesin li a { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .95rem; }
.data-mesin li span { color: var(--tinta-2); font-size: .9rem; }

/* Kaki */
.kaki { border-top: 1px solid var(--garis); padding: 2.25rem 0 3rem; color: var(--tinta-2); font-size: .9rem; }
.penafian { max-width: 52em; }
.hak { margin: 0; }

/* Halaman 404 */
.hilang { min-height: 70vh; display: grid; place-content: center; text-align: center; gap: 1rem; padding: 2rem 1rem; }
.hilang h1 { font-size: clamp(2rem, 5vw, 3rem); }