/* =========================================================================
   Lahan Terdampak: situs penelitian skripsi
   Satu keluarga huruf (Plus Jakarta Sans + JetBrains Mono), satu aksen (hijau padi).
   Warna tiga kelas kerusakan dikunci agar sama dengan keluaran model.
   Radius: kontrol interaktif = pil, wadah = 16px, elemen dalam = 10px.
   ========================================================================= */
:root {
  --bg: #f3f5ef;
  --bg-2: #e8ece2;
  --surface: #fbfcf8;
  --ink: #172016;
  --ink-2: #445040;
  --ink-3: #6b7566;
  --line: #d6dccd;
  --accent: #2f5d27;          /* hijau padi: satu-satunya aksen */
  --accent-soft: #dfe8d6;
  --accent-ink: #fbfcf8;
  --series-2: #a3ad9b;        /* seri pembanding pada grafik (netral) */
  --series-3: #6f8a62;
  --shadow: 0 1px 2px rgb(23 32 22 / .05), 0 10px 30px -12px rgb(23 32 22 / .18);
  --radius: 16px;
  --radius-sm: 10px;
  /* warna kelas: sama dengan keluaran model (JANGAN diubah) */
  --cls-none: #27ae60;
  --cls-mid: #f39c12;
  --cls-sev: #c0392b;
  --max: 1180px;
  --font-body: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  --ease: cubic-bezier(.16, 1, .3, 1);
  /* skala z-index */
  --z-nav: 20; --z-skip: 30; --z-lb: 40;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f140e; --bg-2: #151c13; --surface: #1a2218; --ink: #e9eee2; --ink-2: #b8c2ae; --ink-3: #8b9682;
    --line: #2a3426; --accent: #93c56f; --accent-soft: #24331f; --accent-ink: #0f140e;
    --series-2: #56624f; --series-3: #7fa36b;
    --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 10px 30px -12px rgb(0 0 0 / .6); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f140e; --bg-2: #151c13; --surface: #1a2218; --ink: #e9eee2; --ink-2: #b8c2ae; --ink-3: #8b9682;
  --line: #2a3426; --accent: #93c56f; --accent-soft: #24331f; --accent-ink: #0f140e;
  --series-2: #56624f; --series-3: #7fa36b;
  --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 10px 30px -12px rgb(0 0 0 / .6); color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font-body);
  font-size: 16.5px; line-height: 1.65; overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-underline-offset: 3px; transition: color .2s; }
em { font-style: italic; }
h1, h2, h3, h4 { font-family: var(--font-body); line-height: 1.12; margin: 0 0 .5em; text-wrap: balance; }
h1 { font-size: clamp(2.2rem, 4.6vw, 3.35rem); font-weight: 800; letter-spacing: -.035em; line-height: 1.06; }
h2 { font-size: clamp(1.65rem, 3.2vw, 2.3rem); font-weight: 750; letter-spacing: -.028em; }
h3 { font-size: 1.12rem; font-weight: 700; letter-spacing: -.012em; }
h1 em, h2 em { padding-bottom: .06em; }
p { margin: 0 0 1em; text-wrap: pretty; }
code, .mono { font-family: var(--font-mono); font-size: .86em; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
@media (max-width: 480px) { .wrap { padding: 0 16px; } }
.muted { color: var(--ink-2); }
.small { font-size: .9rem; }
.eyebrow { font-size: .92rem; font-weight: 600; color: var(--ink-3); margin-bottom: 1rem; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.skip {
  position: absolute; left: 16px; top: -60px; z-index: var(--z-skip); background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: 999px; font-weight: 700; text-decoration: none; transition: top .2s var(--ease);
}
.skip:focus { top: 12px; }

/* ---------- navigasi ---------- */
.nav {
  position: sticky; top: 0; z-index: var(--z-nav); background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.3) blur(12px); -webkit-backdrop-filter: saturate(1.3) blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
}
.nav .wrap { display: flex; align-items: center; gap: 18px; min-height: 66px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; color: var(--ink); }
.brand img { width: 34px; height: 34px; }
:root[data-theme="dark"] .brand img, :root[data-theme="dark"] .logo-inv { filter: invert(1); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .brand img, :root:not([data-theme="light"]) .logo-inv { filter: invert(1); } }
.brand span { font-weight: 800; font-size: 1rem; letter-spacing: -.02em; line-height: 1.15; }
.brand small { display: block; font-weight: 500; font-size: .74rem; letter-spacing: 0; color: var(--ink-3); }
.menu { display: flex; gap: 2px; margin: 0 0 0 auto; align-items: center; list-style: none; padding: 0; }
.menu a {
  display: block; padding: 8px 13px; border-radius: 999px; text-decoration: none; color: var(--ink-2);
  font-weight: 600; font-size: .93rem; transition: background .2s, color .2s;
}
.menu a:hover { background: var(--bg-2); color: var(--ink); }
.menu a[aria-current="page"] { background: var(--accent-soft); color: var(--ink); }
.icon-btn {
  width: 38px; height: 38px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface);
  color: var(--ink); display: inline-grid; place-items: center; cursor: pointer; flex: none; font-size: 18px;
  transition: background .2s, transform .15s var(--ease);
}
.icon-btn:hover { background: var(--bg-2); }
.icon-btn:active { transform: scale(.94); }
.burger { display: none; }
@media (max-width: 860px) {
  .burger { display: inline-grid; margin-left: auto; }
  .menu {
    display: none; position: absolute; left: 0; right: 0; top: 66px; flex-direction: column; align-items: stretch;
    background: var(--surface); border-bottom: 1px solid var(--line); padding: 10px 16px 16px; box-shadow: var(--shadow);
  }
  .menu.open { display: flex; }
  .menu a { border-radius: var(--radius-sm); padding: 12px 14px; }
}

/* ---------- tombol ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5em; padding: 12px 22px; border-radius: 999px; border: 1px solid transparent;
  background: var(--accent); color: var(--accent-ink); font-weight: 700; text-decoration: none; cursor: pointer; white-space: nowrap;
  font-family: var(--font-body); font-size: .95rem; transition: transform .2s var(--ease), box-shadow .2s, background .2s;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn:active { transform: translateY(0) scale(.98); box-shadow: none; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { background: var(--surface); }
.btn.sm { padding: 8px 15px; font-size: .88rem; }
.btn[disabled] { opacity: .5; cursor: not-allowed; transform: none; box-shadow: none; }
.btn i { font-size: 1.1em; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; }
.link { font-weight: 700; text-decoration: none; display: inline-flex; align-items: center; gap: .35em; }
.link:hover { text-decoration: underline; }

/* ---------- hero ---------- */
.hero { position: relative; padding: 72px 0 64px; overflow: hidden; }
.hero::before {                         /* motif kontur sawah bertingkat */
  content: ""; position: absolute; inset: 0; opacity: .55; pointer-events: none;
  background-image: repeating-radial-gradient(ellipse at 90% 115%, transparent 0 22px, color-mix(in srgb, var(--accent) 12%, transparent) 22px 23px);
  mask-image: linear-gradient(to left, #000 15%, transparent 70%); -webkit-mask-image: linear-gradient(to left, #000 15%, transparent 70%);
}
.hero .wrap { position: relative; display: grid; grid-template-columns: 1.08fr 1fr; gap: 56px; align-items: center; }
.hero:not(.page) h1 { font-size: clamp(2.1rem, 4vw, 3rem); }
.hero.page .wrap { grid-template-columns: 1fr; }
.hero.page { padding: 56px 0 28px; }
.hero.page h1 { max-width: 18ch; }
@media (max-width: 920px) { .hero .wrap { grid-template-columns: 1fr; gap: 32px; } .hero { padding-top: 40px; } }
.hero h1 em { font-style: italic; color: var(--accent); }
.lead { font-size: 1.14rem; color: var(--ink-2); max-width: 34em; }
.hero .btn-row { margin-top: 28px; }
.dot { width: 10px; height: 10px; border-radius: 3px; display: inline-block; flex: none; }
.dot.none { background: var(--cls-none); } .dot.mid { background: var(--cls-mid); } .dot.sev { background: var(--cls-sev); }

/* ---------- pembanding sebelum/sesudah ---------- */
.compare {
  position: relative; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); background: var(--bg-2);
  aspect-ratio: 1024 / 1018; user-select: none; touch-action: pan-y;
}
.compare img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.compare .top { clip-path: inset(0 calc(100% - var(--pos, 50%)) 0 0); }
.compare .handle {
  position: absolute; top: 0; bottom: 0; left: var(--pos, 50%); width: 2px; background: #fbfcf8; transform: translateX(-1px);
  box-shadow: 0 0 0 1px rgb(15 20 14 / .25); pointer-events: none;
}
.compare .handle::after {
  content: "\2194"; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 42px; height: 42px;
  border-radius: 999px; background: #fbfcf8; color: #172016; display: grid; place-items: center; font-size: 18px;
  box-shadow: 0 4px 14px rgb(15 20 14 / .35);
}
.compare input[type=range] { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: ew-resize; margin: 0; }
.compare:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 3px; }
.compare .tag {
  position: absolute; top: 12px; padding: 4px 11px; border-radius: 999px; background: rgb(15 20 14 / .7); color: #fbfcf8;
  font-size: .78rem; font-weight: 700; pointer-events: none;
}
.compare .tag.l { left: 12px; } .compare .tag.r { right: 12px; }
.compare-cap { margin-top: 12px; font-size: .86rem; color: var(--ink-3); display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.legend { display: flex; flex-wrap: wrap; gap: 16px; font-size: .86rem; color: var(--ink-2); margin-top: 12px; }
.legend span { display: inline-flex; align-items: center; gap: 7px; }

/* ---------- section ---------- */
section { padding: 88px 0 96px; }
section.alt { background: var(--bg-2); }
.head { max-width: 680px; margin-bottom: 40px; }
.head p { max-width: 62ch; }
.grid { display: grid; gap: 20px; }
.g2 { grid-template-columns: repeat(2, 1fr); } .g3 { grid-template-columns: repeat(3, 1fr); } .g4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .g3, .g4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 767px) { .g2, .g3, .g4 { grid-template-columns: 1fr; } section { padding: 64px 0 72px; } }
.card { background: var(--surface); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.card h3 { margin-bottom: .35em; }
.card p:last-child { margin-bottom: 0; }
.num { font-size: clamp(2rem, 4vw, 2.7rem); font-weight: 800; letter-spacing: -.04em; line-height: 1; font-variant-numeric: tabular-nums; }
.src { margin-top: 8px; color: var(--ink-3); font-size: .8rem; }

/* fakta latar belakang: satu angka utama + tiga angka pendukung */
.facts { display: grid; grid-template-columns: 1.15fr 1fr; gap: 28px 56px; align-items: stretch; }
.facts .main { background: var(--surface); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); display: flex; flex-direction: column; justify-content: center; }
.facts .main .num { font-size: clamp(3.2rem, 7vw, 5rem); color: var(--accent); }
.facts .main p { font-size: 1.05rem; margin: 14px 0 0; max-width: 30ch; }
.facts .side { display: grid; gap: 26px; align-content: center; }
.facts .side > div { display: grid; grid-template-columns: 7.2rem 1fr; gap: 18px; align-items: baseline; }
.facts .side .num { font-size: 1.9rem; }
.facts .side p { margin: 0; color: var(--ink-2); font-size: .95rem; }
@media (max-width: 767px) { .facts { grid-template-columns: 1fr; } .facts .main { min-height: 0; } .facts .side > div { grid-template-columns: 6rem 1fr; } }

/* definisi kelas & batas data */
.notes { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line); }
.notes h3 { font-size: 1rem; margin-bottom: .3em; }
.notes p { margin: 0; }
@media (max-width: 520px) { .notes { grid-template-columns: 1fr; } }

/* alur pipeline: garis waktu tanpa kartu */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.flow::before { content: ""; position: absolute; top: 21px; left: 22px; right: 22px; height: 2px; background: var(--line); }
.step { position: relative; padding: 0 22px 0 0; }
.step .ic {
  position: relative; width: 44px; height: 44px; border-radius: 14px; background: var(--surface); box-shadow: var(--shadow);
  display: grid; place-items: center; color: var(--accent); font-size: 22px; margin-bottom: 20px;
}
.step .who { font-size: .82rem; font-weight: 600; color: var(--ink-3); margin-bottom: 4px; }
.step p { font-size: .93rem; color: var(--ink-2); }
@media (max-width: 900px) {
  .flow { grid-template-columns: 1fr; gap: 28px; }
  .flow::before { top: 22px; bottom: 22px; left: 21px; right: auto; width: 2px; height: auto; }
  .step { display: grid; grid-template-columns: 44px 1fr; gap: 0 18px; padding: 0; }
  .step .ic { margin: 0; grid-row: span 3; }
}

/* ringkasan hasil: bento 4 sel */
.bento { display: grid; grid-template-columns: 1.25fr 1fr 1fr; grid-template-rows: auto auto; gap: 18px; }
.bento > * { background: var(--surface); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.bento .big { grid-row: span 2; padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.bento .big img { aspect-ratio: 16 / 10; object-fit: cover; width: 100%; }
.bento .big .in-txt { padding: 24px; }
.bento .wide { grid-column: span 2; display: grid; grid-template-columns: auto 1fr; gap: 24px; align-items: center; background: var(--accent); color: var(--accent-ink); }
.bento .wide .lbl, .bento .wide .who { color: color-mix(in srgb, var(--accent-ink) 82%, transparent); }
.bento .who { font-size: .86rem; font-weight: 700; color: var(--ink-3); margin-bottom: 10px; }
.bento .num { margin-bottom: 10px; }
.bento .lbl { font-size: .92rem; color: var(--ink-2); margin: 0; }
@media (max-width: 900px) { .bento { grid-template-columns: 1fr 1fr; } .bento .big { grid-column: span 2; grid-row: auto; } }
@media (max-width: 560px) { .bento { grid-template-columns: 1fr; } .bento .big, .bento .wide { grid-column: auto; } .bento .wide { grid-template-columns: 1fr; gap: 6px; } }

/* strip metrik (tanpa kartu terpisah) */
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); }
.metrics > div { padding: 22px 24px; }
.metrics > div + div { border-left: 1px solid var(--line); }
.metrics .who { font-size: .86rem; font-weight: 700; color: var(--ink-3); }
.metrics .num { font-size: 2rem; margin: 8px 0; }
.metrics .num.acc { color: var(--accent); }
.metrics p { margin: 0; font-size: .85rem; color: var(--ink-2); }
@media (max-width: 900px) { .metrics { grid-template-columns: 1fr 1fr; } .metrics > div:nth-child(3) { border-left: 0; } .metrics > div:nth-child(n+3) { border-top: 1px solid var(--line); } }
@media (max-width: 480px) { .metrics { grid-template-columns: 1fr; } .metrics > div + div { border-left: 0; border-top: 1px solid var(--line); } }

/* dua kolom: judul lekat di kiri, isi di kanan */
.split { display: grid; grid-template-columns: .85fr 1.15fr; gap: 56px; align-items: start; }
.split .stick { position: sticky; top: 100px; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: 28px; } .split .stick { position: static; } }
.phases { display: grid; grid-template-columns: 1fr 1fr; gap: 34px 32px; }
.phases h3 { display: flex; align-items: center; gap: 10px; }
.phases h3 i { color: var(--accent); font-size: 1.25rem; }
.phases p { margin: 0; color: var(--ink-2); font-size: .94rem; }
@media (max-width: 560px) { .phases { grid-template-columns: 1fr; } }

/* skala label kerusakan d(P) */
.scale { display: grid; grid-template-columns: 1fr 5fr 5fr; gap: 6px; }
.scale .bar { height: 14px; border-radius: 999px; }
.scale .none { background: var(--cls-none); } .scale .mid { background: var(--cls-mid); } .scale .sev { background: var(--cls-sev); }
.scale-lbl { display: grid; grid-template-columns: 1fr 5fr 5fr; gap: 6px; margin-top: 8px; font-family: var(--font-mono); font-size: .8rem; color: var(--ink-3); }
.scale-lbl span:nth-child(2) { padding-left: 2px; }
.classes { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 28px; margin-top: 30px; }
.classes h3 { display: flex; align-items: center; gap: 9px; }
.classes .mono { color: var(--ink-3); display: block; margin-bottom: 6px; }
.classes p { margin: 0; color: var(--ink-2); font-size: .94rem; }
@media (max-width: 767px) { .classes { grid-template-columns: 1fr; gap: 20px; } }

/* layer fitur */
.layers { display: grid; grid-template-columns: 1fr 1fr; gap: 32px 40px; }
@media (max-width: 767px) { .layers { grid-template-columns: 1fr; } }
.layer { display: grid; grid-template-columns: 44px 1fr; gap: 16px; align-items: start; }
.layer .ic {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: var(--surface);
  box-shadow: var(--shadow); color: var(--accent); font-family: var(--font-mono); font-weight: 600;
}
.layer h3 { margin-bottom: .15em; }
.layer .tech { font-family: var(--font-mono); font-size: .78rem; color: var(--ink-3); margin-bottom: 6px; }
.layer p { margin: 0; font-size: .94rem; color: var(--ink-2); }

/* ---------- tabel ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius-sm); background: var(--surface); box-shadow: var(--shadow); }
table.data { width: 100%; border-collapse: collapse; font-size: .9rem; font-variant-numeric: tabular-nums; }
table.data caption { caption-side: top; text-align: left; font-weight: 700; padding: 16px 16px 10px; color: var(--ink); }
table.data th, table.data td { padding: 9px 12px; border-bottom: 1px solid var(--line); text-align: center; vertical-align: top; }
table.data thead th { background: var(--bg-2); font-weight: 700; color: var(--ink-2); font-size: .83rem; }
table.data td:first-child, table.data th:first-child { text-align: left; padding-left: 16px; }
table.data td.l { text-align: left; }
table.data tr.b td { font-weight: 700; }
table.data tr.panel td { background: var(--bg-2); font-weight: 700; text-align: left; }
table.data tbody tr:last-child td { border-bottom: 0; }
table.data tbody tr:hover td { background: color-mix(in srgb, var(--accent-soft) 45%, transparent); }
.tnote { font-size: .8rem; color: var(--ink-3); padding: 2px 16px 14px; margin: 0; }

/* ---------- tab ---------- */
.tabs { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 28px; padding: 4px; background: var(--bg-2); border-radius: 999px; width: fit-content; max-width: 100%; }
.tab {
  border: 0; background: transparent; color: var(--ink-2); padding: 9px 16px; border-radius: 999px;
  cursor: pointer; font-weight: 700; font-family: var(--font-body); font-size: .9rem; transition: background .2s, color .2s;
}
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.tab small { font-weight: 600; color: var(--ink-3); margin-right: 4px; }
@media (max-width: 640px) { .tabs { border-radius: var(--radius); } }
.pane[hidden] { display: none; }
.pane > * + * { margin-top: 22px; }

/* ---------- grafik ---------- */
.chart-box { position: relative; height: 320px; }
@media (max-width: 620px) { .chart-box { height: 280px; } }

/* ---------- callout ---------- */
.callout {
  border-left: 3px solid var(--accent); background: var(--surface); padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--ink); max-width: 75ch;
}
.callout.warn { border-left-color: var(--cls-sev); }

/* ---------- demo ---------- */
.tile-pick { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 26px; }
@media (max-width: 700px) { .tile-pick { grid-template-columns: repeat(2, 1fr); } }
.tile-btn {
  border: 0; border-radius: var(--radius-sm); padding: 0; background: var(--surface); cursor: pointer; box-shadow: var(--shadow);
  overflow: hidden; text-align: left; font-family: var(--font-body); color: var(--ink); outline: 2px solid transparent; outline-offset: 2px;
  transition: transform .2s var(--ease), outline-color .2s;
}
.tile-btn:hover { transform: translateY(-2px); }
.tile-btn:active { transform: scale(.98); }
.tile-btn img { aspect-ratio: 1; object-fit: cover; width: 100%; }
.tile-btn span { display: block; padding: 9px 12px; font-weight: 700; font-size: .88rem; }
.tile-btn span small { display: block; font-weight: 500; color: var(--ink-3); }
.tile-btn[aria-pressed="true"] { outline-color: var(--accent); }
.demo-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 28px; align-items: start; }
@media (max-width: 920px) { .demo-grid { grid-template-columns: 1fr; } }
.stack { display: grid; gap: 16px; align-content: start; }
.seg { display: inline-flex; border-radius: 999px; padding: 4px; background: var(--bg-2); gap: 2px; flex-wrap: wrap; }
.seg button {
  border: 0; background: transparent; padding: 7px 14px; border-radius: 999px; font-weight: 700; color: var(--ink-2);
  cursor: pointer; font-family: var(--font-body); font-size: .86rem; transition: background .2s, color .2s;
}
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.alt .seg { background: var(--bg); }

.drop {
  border: 1.5px dashed color-mix(in srgb, var(--ink-3) 55%, transparent); border-radius: var(--radius); padding: 20px; background: var(--surface);
  text-align: center; cursor: pointer; transition: background .2s, border-color .2s; position: relative; min-height: 230px;
  display: grid; place-items: center;
}
.drop:hover, .drop.over { background: var(--accent-soft); border-color: var(--accent); }
.drop:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 3px; }
.drop input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.drop .pv { max-height: 260px; border-radius: 8px; margin: 0 auto; }
.drop .drop-ph { color: var(--ink-3); font-size: .92rem; }
.drop .drop-ph i { display: block; font-size: 28px; color: var(--accent); margin-bottom: 6px; }
.drop .drop-ph b { display: block; color: var(--ink); font-size: 1rem; margin-bottom: 2px; }
.field { display: grid; gap: 8px; }
.field label { font-weight: 700; font-size: .92rem; }
.field .help { font-size: .82rem; color: var(--ink-3); margin: 0; }
.field input[type=number] {
  padding: 10px 14px; border-radius: var(--radius-sm); border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  font-family: var(--font-mono); font-size: .95rem; max-width: 220px;
}
.samples { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; margin-bottom: 26px; }
.samples > span { font-weight: 700; margin-right: 6px; }
.status {
  display: flex; align-items: flex-start; gap: 12px; padding: 14px 18px; border-radius: var(--radius-sm); background: var(--surface);
  box-shadow: var(--shadow); font-weight: 600;
}
.status i { font-size: 20px; color: var(--accent); flex: none; margin-top: 2px; }
.status.err i { color: var(--cls-sev); }
.status .pulse { width: 10px; height: 10px; margin-top: 8px; border-radius: 999px; background: var(--accent); flex: none; animation: pulse 1.4s var(--ease) infinite; }
@keyframes pulse { 0%, 100% { opacity: .35; transform: scale(.8); } 50% { opacity: 1; transform: scale(1); } }
/* skeleton: bentuk sama dengan hasil akhir (gambar + tabel) */
.skel { background: linear-gradient(90deg, var(--bg-2) 0%, var(--surface) 45%, var(--bg-2) 90%); background-size: 220% 100%; animation: shimmer 1.6s linear infinite; border-radius: var(--radius-sm); }
.skel.img { aspect-ratio: 1024 / 1018; border-radius: var(--radius); }
.skel.row { height: 38px; }
.skel-rows { display: grid; gap: 8px; }
@keyframes shimmer { to { background-position: -220% 0; } }
pre.log {
  background: #121810; color: #d3dfc6; padding: 14px; border-radius: var(--radius-sm); font-size: .8rem; overflow-x: auto;
  white-space: pre-wrap; margin: 0; max-height: 360px;
}
details.card summary { cursor: pointer; }
.result-img { border-radius: var(--radius); box-shadow: var(--shadow); cursor: zoom-in; }

/* lightbox */
.lb { position: fixed; inset: 0; background: rgb(10 13 9 / .92); display: none; place-items: center; z-index: var(--z-lb); padding: 20px; }
.lb.open { display: grid; }
.lb img { max-height: 92vh; width: auto; max-width: 96vw; border-radius: 10px; }
.lb button { position: absolute; top: 16px; right: 16px; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); padding: 56px 0 32px; color: var(--ink-2); }
footer .cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 36px; }
@media (max-width: 800px) { footer .cols { grid-template-columns: 1fr; } }
footer h4 { font-size: .98rem; margin: 0 0 10px; color: var(--ink); letter-spacing: -.01em; }
footer .id { display: flex; gap: 16px; align-items: flex-start; }
footer .id img { width: 48px; height: 48px; flex: none; }
footer .fine { border-top: 1px solid var(--line); margin-top: 36px; padding-top: 18px; font-size: .8rem; color: var(--ink-3); max-width: 90ch; }
footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }

/* ---------- 404 ---------- */
.nf { min-height: 70dvh; display: grid; align-items: center; }
.nf .code { font-family: var(--font-mono); color: var(--ink-3); font-size: .95rem; margin-bottom: 12px; }

/* ---------- animasi muncul ---------- */
.rv { opacity: 0; transform: translateY(16px); transition: opacity .7s var(--ease), transform .7s var(--ease); transition-delay: calc(var(--i, 0) * 70ms); }
.rv.in { opacity: 1; transform: none; }
html.shot .rv { opacity: 1; transform: none; transition: none; }
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .skel, .status .pulse { animation: none; }
  .btn, .tile-btn, .icon-btn { transition: none; }
}
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- tambahan revisi pascasidang: identitas, alur sederhana, perhitungan layer ---------- */
.idcard { display: grid; grid-template-columns: 180px 1fr; gap: 10px 24px; background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px; }
.idcard dt { font-weight: 700; color: var(--ink-3); font-size: .9rem; }
.idcard dd { margin: 0; }
.idcard dd.judul { font-weight: 700; line-height: 1.5; }
@media (max-width: 620px) { .idcard { grid-template-columns: 1fr; gap: 2px; } .idcard dd { margin-bottom: 10px; } }
.alur { counter-reset: s; display: grid; gap: 14px; }
.alur > li { list-style: none; display: grid; grid-template-columns: 52px 1fr; gap: 16px; align-items: start; background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px 20px; }
.alur > li::before { counter-increment: s; content: counter(s); display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 800; font-size: 1.15rem; }
.alur h3 { margin: 4px 0 .25em; font-size: 1.05rem; }
.alur p { margin: 0; }
.alur .tag-t { display: inline-block; font-size: .78rem; font-weight: 700; color: var(--accent); background: var(--accent-soft); border-radius: 999px; padding: 2px 10px; margin-bottom: 4px; }
.hitung { display: block; background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.hitung + .hitung { margin-top: 22px; }
.hitung h3 { display: flex; gap: 10px; align-items: center; margin: 0 0 .4em; }
.hitung h3 .no { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font-size: .95rem; flex: none; }
.hitung .grid-img { background: #fff; border-radius: var(--radius-sm); padding: 10px; border: 1px solid var(--line); text-align: center; }
.hitung .grid-img img { max-height: 230px; width: auto; margin: 0 auto; }
.hitung .rumus { font-family: var(--font-mono); font-size: .92rem; background: var(--bg-2); border-radius: var(--radius-sm); padding: 10px 14px; margin: 12px 0 0; }
.hitung .rumus b { color: var(--accent); }
.hitung figure { margin: 0; }
.hitung figcaption { font-size: .82rem; color: var(--ink-3); margin-top: 6px; }
.hitung .contoh img { border-radius: var(--radius-sm); }
.key { display: inline-flex; align-items: center; gap: 6px; margin-right: 12px; font-size: .88rem; }
.key i { width: 14px; height: 14px; border-radius: 3px; display: inline-block; }
@media (max-width: 820px) { .hitung { grid-template-columns: 1fr; } }

.hitung .contoh { margin: 14px 0 16px; }
.hitung .duo { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 22px; align-items: center; }
@media (max-width: 820px) { .hitung .duo { grid-template-columns: 1fr; } }