/* ALBeID — site stylesheet. System fonts only; no external requests. */

:root {
  --ink: #131c33;
  --ink-2: #2b3450;
  --paper: #f8f6f1;
  --paper-2: #f0ece3;
  --card: #ffffff;
  --muted: #5b6070;
  --rule: #ddd7c9;
  --accent: #a97c2a;
  --accent-2: #c9a24d;
  --link: #1c4a8a;
  --dark-bg: #0f1526;
  --dark-fg: #ece8df;
  --dark-muted: #b8b3a8;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max: 72rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #ece8df;
    --ink-2: #cfcabf;
    --paper: #11151f;
    --paper-2: #161b28;
    --card: #1a2030;
    --muted: #a3a8b4;
    --rule: #2b3243;
    --accent: #d2a955;
    --accent-2: #e2c27a;
    --link: #8fb4e8;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 .6em;
  letter-spacing: -.01em;
  color: var(--ink);
}
h1 { font-size: clamp(2.1rem, 4.5vw, 3.3rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; margin-top: 1.5em; }
p { margin: 0 0 1em; }
a { color: var(--link); text-underline-offset: .15em; }
a:hover { text-decoration-thickness: 2px; }
em { font-style: italic; }
ul.plain { padding-left: 1.2em; }
ul.plain li { margin-bottom: .6em; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }
.prose { max-width: 44em; }
.prose > p:last-child { margin-bottom: 0; }
.two-col { display: grid; gap: 2.5rem; grid-template-columns: 1fr; }
@media (min-width: 56rem) { .two-col { grid-template-columns: 1fr 1fr; } }

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #fff; padding: .5rem 1rem; z-index: 100;
}
.skip:focus { left: 1rem; }

.notice {
  background: var(--accent); color: #1b1408;
  text-align: center; padding: .55rem 1rem; font-size: .92rem;
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}
.header-inner {
  display: flex; align-items: center; gap: 1.25rem 1.75rem; flex-wrap: wrap;
  min-height: 4.25rem; padding-top: .6rem; padding-bottom: .6rem;
}
.brand {
  display: flex; align-items: center; gap: .65rem;
  text-decoration: none; color: var(--ink);
  font-family: var(--serif); font-size: 1.4rem; font-weight: 700; letter-spacing: .02em;
}
.brand .mark { width: 2rem; height: 2rem; border-radius: .4rem; }
.brand-name span { color: var(--accent); font-style: italic; }
.site-nav { display: flex; gap: 1.25rem; margin-left: auto; flex-wrap: wrap; }
.site-nav a {
  color: var(--ink); text-decoration: none; font-weight: 500;
  padding: .3rem 0; border-bottom: 2px solid transparent;
}
.site-nav a:hover { border-color: var(--accent-2); }
.site-nav a[aria-current="page"] { border-color: var(--accent); }
.lang-nav { display: flex; gap: .3rem; font-size: .78rem; letter-spacing: .08em; }
.lang-nav a {
  text-decoration: none; color: var(--muted);
  padding: .2rem .55rem; border: 1px solid var(--rule); border-radius: 999px;
}
.lang-nav a:hover { color: var(--ink); border-color: var(--ink); }
.lang-nav a[aria-current="true"] { color: var(--paper); background: var(--ink); border-color: var(--ink); }

/* ---------- hero & intros ---------- */
.hero { padding: 4.5rem 0 3.5rem; border-bottom: 1px solid var(--rule); }
.hero-grid { display: grid; gap: 3rem; align-items: center; grid-template-columns: 1fr; }
@media (min-width: 56rem) { .hero-grid { grid-template-columns: 3fr 2fr; } }
.kicker {
  font-size: .78rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--accent); font-weight: 600; margin-bottom: 1rem;
}
.lead { font-size: 1.2rem; color: var(--ink-2); line-height: 1.55; }
.hero .lead { max-width: 36em; }
.actions { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1.75rem; }
.btn {
  display: inline-block; padding: .7rem 1.25rem; border-radius: .4rem;
  text-decoration: none; font-weight: 600;
  border: 1.5px solid var(--ink); color: var(--ink);
}
.btn:hover { background: var(--paper-2); }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--ink-2); }
.page-intro { padding: 4rem 0 2.5rem; border-bottom: 1px solid var(--rule); }
.page-intro .lead { margin-bottom: 1.25rem; }

/* ---------- the formula ---------- */
.formula { margin: 0; text-align: center; font-family: var(--serif); color: var(--ink); }
.formula-title {
  font-family: var(--sans); font-size: .78rem; letter-spacing: .22em; text-transform: uppercase;
  color: var(--ink-2); margin-bottom: .75rem;
}
.formula-body { display: inline-flex; align-items: center; gap: .5rem; }
.int-wrap {
  display: inline-grid; grid-template-columns: auto auto; grid-template-rows: 1fr auto 1fr;
  align-items: center; column-gap: .1rem;
}
.int-sign {
  grid-row: 1 / 4; grid-column: 1;
  font-size: 7.5rem; line-height: .9; font-style: italic; color: var(--accent);
  transform: skewX(-8deg); font-weight: 400;
}
.int-upper, .int-lower { grid-column: 2; font-size: 1.05rem; font-style: italic; letter-spacing: .04em; }
.int-upper { grid-row: 1; align-self: start; padding-top: .35rem; }
.int-lower { grid-row: 3; align-self: end; padding-bottom: .35rem; }
.integrand { font-size: 2.7rem; font-style: italic; letter-spacing: .02em; }
.formula figcaption {
  margin: 1rem auto 0; font-family: var(--sans); font-size: .9rem; color: var(--muted); max-width: 30em;
}
.formula-inline { margin: 2rem 0; padding: 1.5rem 1rem; background: var(--paper-2); border-radius: .6rem; }
.formula-inline .int-sign { font-size: 6rem; }
.formula-inline .integrand { font-size: 2.2rem; }

/* ---------- sections ---------- */
.section { padding: 3.75rem 0; }
.section + .section { border-top: 1px solid var(--rule); }
.section-tint { background: var(--paper-2); }
.section-head { max-width: 44em; margin-bottom: 2rem; }
.section-head h2 { margin-bottom: .5rem; }
.more { margin-top: 1.5rem; font-weight: 600; }

.grid { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.card {
  background: var(--card); border: 1px solid var(--rule); border-radius: .6rem; padding: 1.5rem;
  display: block; color: inherit;
}
.card h3, .card h4 { margin-bottom: .5rem; }
.card p { margin: 0; color: var(--ink-2); }
.card p + h3 { margin-top: .2rem; }
.card .num { font-family: var(--serif); color: var(--accent); font-size: .95rem; letter-spacing: .15em; margin-bottom: .5rem; }
.card-link { text-decoration: none; transition: border-color .15s, transform .15s; }
.card-link:hover { border-color: var(--accent); transform: translateY(-2px); }
.card-link h3 { text-decoration: underline; text-decoration-color: transparent; }
.card-link:hover h3 { text-decoration-color: var(--accent); }

.band { background: var(--dark-bg); color: var(--dark-fg); padding: 3.5rem 0; }
.band h2, .band h3 { color: var(--dark-fg); }
.band p { color: var(--dark-fg); }
.band a { color: var(--accent-2); }
.band-grid { display: grid; gap: 1.5rem 3rem; grid-template-columns: 1fr; align-items: start; }
@media (min-width: 56rem) { .band-grid { grid-template-columns: 1fr 2fr; } }
.band .thesis { color: var(--dark-fg); border-color: var(--accent-2); }

/* ---------- project components ---------- */
.component {
  display: grid; gap: .5rem 2.5rem; grid-template-columns: 1fr;
  padding: 2.5rem 0; border-top: 1px solid var(--rule);
}
@media (min-width: 56rem) { .component { grid-template-columns: 7rem 1fr; } }
.component .num { font-family: var(--serif); font-size: 2.6rem; color: var(--accent); line-height: 1; margin: 0; }
.component h3 { font-size: 1.6rem; margin-bottom: .25rem; }
.tag {
  display: block; font-size: .76rem; letter-spacing: .07em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 1rem;
}
.levels { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); margin: 1.25rem 0; }
.levels .card { padding: 1.25rem; }
.levels h4 { margin-top: 0; }
.guarantees {
  list-style: none; padding: 0; margin: 1rem 0 1.5rem;
  display: grid; gap: .9rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
}
.guarantees li { border-left: 3px solid var(--accent); padding: .2rem 0 .2rem 1rem; color: var(--ink-2); }
.guarantees strong { display: block; font-family: var(--serif); font-size: 1.08rem; color: var(--ink); margin-bottom: .2rem; }
.phases {
  list-style: none; padding: 0; margin: 1rem 0 1.5rem;
  display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
}
.phases li { background: var(--card); border: 1px solid var(--rule); border-radius: .6rem; padding: 1.25rem; }
.phase-label { display: block; font-size: .76rem; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); font-weight: 600; }
.phases strong { display: block; font-family: var(--serif); font-size: 1.15rem; margin: .25rem 0 .5rem; }
.phases p { margin: 0; color: var(--ink-2); font-size: .97rem; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin: 0; font-size: .97rem; background: var(--card); border: 1px solid var(--rule); border-radius: .6rem; overflow: hidden; }
th, td { text-align: left; padding: .85rem 1rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
thead th { font-family: var(--sans); font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); background: var(--paper-2); }
tbody th { font-family: var(--serif); font-weight: 600; font-size: 1.05rem; white-space: nowrap; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }

blockquote.thesis {
  font-family: var(--serif); font-size: clamp(1.45rem, 2.6vw, 2.1rem); font-style: italic; line-height: 1.3;
  border-left: 4px solid var(--accent); margin: 0 0 1.5rem; padding: .3rem 0 .3rem 1.5rem;
}
.signature { font-family: var(--serif); font-style: italic; color: var(--ink-2); margin-top: 1.5rem; }

dl.facts { display: grid; grid-template-columns: max-content 1fr; gap: .7rem 1.5rem; margin: 0; }
dl.facts dt { font-weight: 600; }
dl.facts dd { margin: 0; color: var(--ink-2); }
@media (max-width: 40rem) { dl.facts { grid-template-columns: 1fr; } dl.facts dd { margin-bottom: .6rem; } }

.doclist { list-style: none; padding: 0; margin: 0; }
.doclist li {
  display: flex; gap: 1rem; align-items: baseline; flex-wrap: wrap;
  padding: .9rem 0; border-bottom: 1px solid var(--rule);
}
.doclist .num { font-family: var(--serif); color: var(--accent); min-width: 1.5rem; font-size: 1.15rem; }
.doclist a { margin-left: auto; white-space: nowrap; font-size: .85rem; letter-spacing: .04em; }

/* ---------- footer ---------- */
.site-footer { background: var(--dark-bg); color: var(--dark-fg); margin-top: 0; padding: 3rem 0 1.5rem; }
.footer-grid { display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); }
.footer-brand { font-family: var(--serif); font-size: 1.25rem; font-weight: 700; margin-bottom: .4rem; }
.footer-small { font-size: .88rem; color: var(--dark-muted); }
.footer-host { font-size: .85rem; color: var(--dark-muted); margin-left: .3rem; }
.footer-h {
  font-family: var(--sans); font-size: .76rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--accent-2); margin-bottom: .75rem;
}
.site-footer a { color: var(--dark-fg); }
.site-footer a:hover { color: var(--accent-2); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: .35rem 0; }
.footer-bottom {
  display: flex; flex-wrap: wrap; gap: .5rem 2rem; justify-content: space-between;
  border-top: 1px solid rgba(255,255,255,.14); margin-top: 2.25rem; padding-top: 1.25rem;
  font-size: .85rem; color: var(--dark-muted);
}
.footer-bottom p { margin: 0; }
.footer-motto { font-family: var(--serif); font-style: italic; }

@media print {
  .site-header, .lang-nav, .actions, .notice { display: none; }
  body { font-size: 11pt; }
  .band, .site-footer { background: none; color: #000; }
}

/* ---------- Res Publica: Integritas logo ---------- */
.logo-rpi { display: block; width: 100%; max-width: 30rem; height: auto; margin: 0 auto; border-radius: .6rem; }
.formula-inline .logo-rpi { max-width: 26rem; }