/* Tema bersama. Warna aksen (--accent, --accent-2) di-inject per situs dari site.config.js. */
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f1f3f8;
  --text: #0e1525;
  --muted: #5a6478;
  --line: #e3e7ef;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px -12px rgba(16, 24, 40, .12);
  --shadow-lg: 0 2px 4px rgba(16, 24, 40, .04), 0 24px 48px -20px rgba(16, 24, 40, .22);
  --glow: 0 0 0 transparent;
  --radius: 16px;
  --radius-sm: 10px;
  --max: 1080px;
  --prose: 740px;
  --danger: #dc2626;
  --on-accent: #ffffff;
  --accent-soft: color-mix(in srgb, var(--accent) 12%, transparent);
  --accent-line: color-mix(in srgb, var(--accent) 35%, transparent);
  color-scheme: light;
}

/* Dasar */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(900px 480px at 8% -8%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 70%),
    radial-gradient(700px 420px at 100% 0%, color-mix(in srgb, var(--accent-2) 12%, transparent), transparent 70%);
  background-repeat: no-repeat;
  font: 17px/1.75 "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color .25s, color .25s;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
::selection { background: color-mix(in srgb, var(--accent) 30%, transparent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
main.wrap { padding-top: 28px; padding-bottom: 72px; min-height: 60vh; overflow-x: clip; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 8px; z-index: 50; }
.skip:focus { left: 8px; }
.ic { width: 20px; height: 20px; flex: none; }
.ic.sm { width: 16px; height: 16px; }
.small { font-size: .88rem; color: var(--muted); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 16px; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; letter-spacing: -.02em; color: var(--text); text-decoration: none; }
.logo-mark {
  display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; color: var(--on-accent);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 16px -6px color-mix(in srgb, var(--accent) 70%, transparent);
}
.nav { display: flex; gap: 4px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { color: var(--muted); text-decoration: none; font-weight: 600; font-size: .95rem; padding: 7px 12px; border-radius: 999px; white-space: nowrap; transition: color .15s, background .15s; }
.nav a:hover { color: var(--text); background: var(--surface-2); }
.nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }
@media (max-width: 640px) {
  .header-inner { flex-wrap: wrap; height: auto; padding-top: 10px; padding-bottom: 8px; gap: 8px; }
  .nav { order: 3; width: calc(100% + 12px); margin-left: -12px; }
}

/* Tipografi */
h1, h2, h3 { letter-spacing: -.025em; line-height: 1.2; }
h1 { font-size: clamp(1.9rem, 4.2vw, 2.7rem); margin: .2em 0 .35em; font-weight: 800; }
h2 { font-size: clamp(1.35rem, 2.6vw, 1.6rem); margin: 2.2em 0 .6em; font-weight: 750; }
h3 { font-size: 1.12rem; font-weight: 700; margin: 1.6em 0 .4em; }
.lead { font-size: 1.12rem; color: var(--muted); margin-top: 0; }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: .88rem; color: var(--muted); margin-bottom: 12px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.crumbs span { opacity: .5; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: .82rem; font-weight: 700; letter-spacing: .02em;
  color: var(--accent); background: var(--accent-soft); border: 1px solid var(--accent-line); padding: 5px 12px; border-radius: 999px;
}
.grad { background: linear-gradient(120deg, var(--text) 10%, var(--accent) 55%, var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.chip { display: inline-block; font-size: .78rem; font-weight: 700; color: var(--accent); background: var(--accent-soft); padding: 3px 10px; border-radius: 999px; }

/* Hero */
.hero { position: relative; padding: 48px 0 24px; max-width: 820px; }
.hero::before {
  content: ""; position: absolute; top: -40px; right: -20%; width: 420px; height: 420px; max-width: 90vw; z-index: -1; pointer-events: none;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 20%, transparent), transparent);
  filter: blur(10px);
}
@media (max-width: 640px) { .hero::before { top: -20px; right: -40px; width: 280px; height: 280px; } }
.hero h1 { font-size: clamp(2.2rem, 6vw, 3.6rem); line-height: 1.08; margin: .45em 0 .35em; }
.hero-text { font-size: clamp(1.05rem, 2vw, 1.22rem); color: var(--muted); max-width: 640px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 26px 0 22px; }
.hero.small { padding-top: 40px; }
.badges { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 10px 18px; color: var(--muted); font-size: .9rem; }
.badges li { display: inline-flex; align-items: center; gap: 6px; }
.badges .ic { color: var(--accent); }
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 32px 0 0; max-width: 520px; }
.stats div { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 16px; box-shadow: var(--shadow); }
.stats dt { font-size: .8rem; color: var(--muted); font-weight: 600; }
.stats dd { margin: 0; font-size: 1.6rem; font-weight: 800; letter-spacing: -.03em; }

/* Tombol */
.btn, .tool button {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  font: inherit; font-weight: 700; font-size: .98rem; color: var(--on-accent); text-decoration: none; cursor: pointer;
  padding: 12px 20px; border: 0; border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 55%, var(--accent-2)));
  box-shadow: 0 8px 20px -8px color-mix(in srgb, var(--accent) 70%, transparent), var(--glow);
  transition: transform .15s, box-shadow .15s, filter .15s;
}
.btn:hover, .tool button:hover { transform: translateY(-1px); filter: brightness(1.06); text-decoration: none; }
.btn:active, .tool button:active { transform: translateY(0); }
.btn.ghost { background: var(--surface); color: var(--text); border: 1px solid var(--line); box-shadow: var(--shadow); }
.btn.ghost:hover { border-color: var(--accent-line); }

/* Section & grid */
.section { margin-top: 56px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.section-head h2 { margin: 0; }
.section-head a { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; font-size: .92rem; text-decoration: none; white-space: nowrap; }
.index-head { max-width: 720px; margin-bottom: 28px; }
.index-head h1 { margin-top: .5em; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr)); gap: 16px; }

/* Kartu */
.card {
  position: relative; display: flex; flex-direction: column; gap: 8px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px;
  color: var(--text); text-decoration: none; box-shadow: var(--shadow);
  transition: transform .2s, border-color .2s, box-shadow .2s;
}
.card::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; opacity: 0; transition: opacity .2s;
  background: radial-gradient(400px 160px at 0% 0%, var(--accent-soft), transparent 70%);
}
.card:hover { transform: translateY(-3px); border-color: var(--accent-line); box-shadow: var(--shadow-lg), var(--glow); text-decoration: none; }
.card:hover::after { opacity: 1; }
.card h3 { margin: 4px 0 0; font-size: 1.08rem; line-height: 1.35; }
.card p { margin: 0; color: var(--muted); font-size: .93rem; line-height: 1.6; flex: 1; }
.card .meta { font-size: .82rem; color: var(--muted); }
.card-icon {
  display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 12px; flex: none;
  color: var(--accent); background: var(--accent-soft); border: 1px solid var(--accent-line);
}
.card-icon .ic { width: 22px; height: 22px; }
.card-icon.lg { width: 56px; height: 56px; border-radius: 16px; }
.card-icon.lg .ic { width: 28px; height: 28px; }
.card-cta { display: inline-flex; align-items: center; gap: 6px; font-size: .88rem; font-weight: 700; color: var(--accent); }
.card-cta .ic { transition: transform .2s; }
.card:hover .card-cta .ic { transform: translateX(3px); }
.article-card .chip { align-self: flex-start; }

/* Halaman konten */
.prose { max-width: var(--prose); }
.page-head { display: flex; gap: 18px; align-items: flex-start; }
.page-head h1 { margin-top: 0; }
@media (max-width: 560px) { .page-head { flex-direction: column; gap: 12px; } }
.article-head { margin-bottom: 8px; }
.article-head h1 { margin-top: .5em; }
.byline { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; color: var(--muted); font-size: .9rem; }
.byline > span { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.avatar {
  display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; flex: none;
  font-weight: 800; color: var(--on-accent); background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.avatar.sm { width: 26px; height: 26px; font-size: .78rem; }
.updated { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: .88rem; margin-top: 32px; }

.prose h2 { position: relative; padding-left: 16px; }
.prose h2::before { content: ""; position: absolute; left: 0; top: .18em; bottom: .18em; width: 4px; border-radius: 4px; background: linear-gradient(var(--accent), var(--accent-2)); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: .3em 0; }
.prose li::marker { color: var(--accent); }
.prose strong { font-weight: 700; }
.table-wrap { margin: 1.2em 0; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); box-shadow: var(--shadow); }
.prose table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: .93rem; }
.prose th, .prose td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { background: var(--surface-2); font-weight: 700; font-size: .85rem; letter-spacing: .01em; }
.prose tr:last-child td { border-bottom: 0; }
.prose tr:hover td { background: color-mix(in srgb, var(--accent) 5%, transparent); }
.prose code { font-family: ui-monospace, "SF Mono", Consolas, monospace; font-size: .88em; background: var(--surface-2); border: 1px solid var(--line); padding: 1px 6px; border-radius: 6px; }
.prose blockquote, .note {
  margin: 1.4em 0; padding: 14px 18px; border-radius: var(--radius-sm);
  background: var(--accent-soft); border: 1px solid var(--accent-line); border-left: 4px solid var(--accent);
}
.prose blockquote { font-style: italic; }
.formula {
  font-family: ui-monospace, "SF Mono", Consolas, monospace; font-size: .92rem; line-height: 1.8;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 14px 18px; overflow-x: auto; box-shadow: var(--shadow);
}
.formula::before { content: "RUMUS"; display: block; font: 700 .68rem/1 "Plus Jakarta Sans", sans-serif; letter-spacing: .12em; color: var(--accent); margin-bottom: 8px; }

/* Daftar isi */
.toc { margin: 24px 0 8px; padding: 16px 20px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.toc strong { font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.toc ol { margin: 8px 0 0; padding-left: 1.2em; columns: 2 240px; column-gap: 24px; }
.toc li { font-size: .93rem; break-inside: avoid; }
.toc li::marker { color: var(--accent); font-weight: 700; }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--accent); }

/* Panel kalkulator */
.tool {
  position: relative; margin: 28px 0 8px; padding: 22px; border-radius: 20px;
  background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-lg), var(--glow);
  overflow: hidden;
}
.tool::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 4px; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.tool-head { display: flex; align-items: center; gap: 6px; font-size: .78rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
.tool .fields { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(210px, 100%), 1fr)); gap: 16px; margin-bottom: 20px; }
.tool label { display: flex; flex-direction: column; gap: 6px; font-weight: 700; font-size: .9rem; }
.tool label[hidden] { display: none; }
.tool label small { font-weight: 500; color: var(--muted); font-size: .8rem; margin-top: -3px; }
.tool input, .tool select {
  font: inherit; font-size: 1rem; font-weight: 500; padding: 11px 13px; width: 100%;
  color: var(--text); background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
.tool input:hover, .tool select:hover { border-color: var(--accent-line); }
.tool input:focus, .tool select:focus { outline: none; border-color: var(--accent); background: var(--surface); box-shadow: 0 0 0 4px var(--accent-soft); }
.tool button { width: 100%; padding: 14px 20px; font-size: 1rem; }
@media (min-width: 640px) { .tool button { width: auto; min-width: 220px; } }
.result {
  margin-top: 20px; padding: 20px; border-radius: 14px; animation: pop .25s ease-out;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 10%, var(--surface)), color-mix(in srgb, var(--accent-2) 8%, var(--surface)));
  border: 1px solid var(--accent-line);
}
.result:empty { display: none; }
.result > span:first-child { font-size: .85rem; font-weight: 700; color: var(--muted); letter-spacing: .01em; }
.result .big {
  display: block; margin: 2px 0 6px; font-size: clamp(1.7rem, 4.5vw, 2.3rem); font-weight: 800; letter-spacing: -.03em; line-height: 1.15;
  background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.result p { margin: .5em 0; }
.result { overflow-x: auto; }
.result table { width: 100%; border-collapse: collapse; font-size: .9rem; margin-top: 12px; background: var(--surface); border-radius: 10px; overflow: hidden; }
.result td, .result th { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: right; }
.result td:first-child, .result th:first-child { text-align: left; }
.result th { background: var(--surface-2); font-size: .8rem; }
.result tr:last-child td { border-bottom: 0; }
.result .note { margin: 12px 0 0; }
.result .scroll { max-height: 340px; overflow: auto; }
.error { color: var(--danger); font-weight: 700; }
@keyframes pop { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* Penulis & terkait */
.author-box { display: flex; gap: 16px; align-items: flex-start; margin-top: 40px; padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.author-box p { margin: 6px 0 0; color: var(--muted); font-size: .93rem; }
.related { margin-top: 56px; }
.related h2 { margin-top: 0; }

/* Footer */
.site-footer { margin-top: 24px; border-top: 1px solid var(--line); background: var(--surface); padding: 48px 0 24px; font-size: .93rem; color: var(--muted); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } .footer-brand { grid-column: 1 / -1; } }
.footer-brand p { max-width: 380px; }
.footer-col { display: flex; flex-direction: column; gap: 8px; }
.footer-col strong { color: var(--text); font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 4px; }
.footer-col a { color: var(--muted); text-decoration: none; }
.footer-col a:hover { color: var(--accent); }
.copyright { margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--line); font-size: .85rem; }

/* Foto dalam konten */
.photo { margin: 1.6em 0; }
.photo img { display: block; width: 100%; max-width: 520px; height: auto; border-radius: var(--radius); border: 1px solid var(--line); box-shadow: var(--shadow-lg); }
.photo figcaption { margin-top: 10px; font-size: .88rem; color: var(--muted); max-width: 520px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}