/* Quran for Scientists — quiet, readable, academic.
   Palette: ink green, warm paper, muted brass. */

:root {
  --paper: #fbfaf6;
  --paper-2: #f4f1e9;
  --ink: #1b231f;
  --ink-soft: #38423c;
  --muted: #6d756d;
  --line: #e3ded2;
  --line-strong: #cfc8b8;
  --accent: #14503a;
  --accent-soft: #e8efe9;
  --brass: #a8843c;
  --brass-soft: #f2e9d6;
  --serif: "Spectral", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --arabic: "Amiri Quran", "Amiri", "Scheherazade New", "Traditional Arabic", serif;
  --measure: 68ch;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(27, 35, 31, .04), 0 12px 32px -18px rgba(27, 35, 31, .22);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #121614;
    --paper-2: #191e1b;
    --ink: #e9ebe5;
    --ink-soft: #c6ccc3;
    --muted: #97a096;
    --line: #2a312d;
    --line-strong: #3a423c;
    --accent: #9fceb5;
    --accent-soft: #1d2a24;
    --brass: #d3ae63;
    --brass-soft: #2a2418;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 32px -18px rgba(0, 0, 0, .7);
  }
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.62;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { text-decoration-color: var(--brass); }

:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
  border-radius: 3px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: .7rem 1rem;
  z-index: 100;
}
.skip:focus { left: .5rem; top: .5rem; }

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: .85rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: .65rem;
  font-family: var(--sans);
  font-weight: 600;
  font-size: .95rem;
  letter-spacing: .01em;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  width: 30px;
  height: 30px;
  flex: none;
  color: var(--accent);
}

.brand small {
  display: block;
  font-weight: 500;
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  font-family: var(--sans);
  font-size: .875rem;
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: .25rem 0;
  border-bottom: 1px solid transparent;
}

.nav a:hover { color: var(--accent); }
.nav a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--brass);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: .4rem .6rem;
  color: var(--ink);
  font-family: var(--sans);
  font-size: .8rem;
  cursor: pointer;
}

/* ---------- Layout ---------- */

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.prose {
  max-width: var(--measure);
  margin-inline: auto;
}

section { padding-block: clamp(2.5rem, 6vw, 5rem); }

.eyebrow {
  font-family: var(--sans);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 0 0 .9rem;
}

h1, h2, h3 {
  font-weight: 500;
  line-height: 1.14;
  letter-spacing: -.012em;
  margin: 0 0 .6em;
}

h1 { font-size: clamp(2.3rem, 5.4vw, 3.9rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3 { font-size: 1.22rem; letter-spacing: 0; line-height: 1.3; }

p { margin: 0 0 1.15em; }

.lede {
  font-size: clamp(1.1rem, 2vw, 1.32rem);
  line-height: 1.6;
  color: var(--ink-soft);
}

.muted { color: var(--muted); }
.small {
  font-family: var(--sans);
  font-size: .83rem;
  line-height: 1.55;
  color: var(--muted);
}

.rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2.5rem 0;
}

/* ---------- Hero ---------- */

.hero {
  padding-block: clamp(3rem, 7vw, 6rem) clamp(2rem, 5vw, 4rem);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto auto;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle at 50% 50%,
    color-mix(in srgb, var(--accent) 9%, transparent) 0%,
    transparent 62%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: end;
}

.hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-top: 1.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--sans);
  font-size: .9rem;
  font-weight: 500;
  padding: .68rem 1.15rem;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  transition: background .18s ease, border-color .18s ease, transform .18s ease;
}

.btn:hover { border-color: var(--accent); transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--paper);
}
.btn-primary:hover { background: var(--ink); border-color: var(--ink); }

.hero-aside {
  border-left: 1px solid var(--line);
  padding-left: 1.6rem;
}

.hero-aside p { font-size: .95rem; color: var(--ink-soft); }
.hero-aside .small { margin: 0; }

/* ---------- Verse ---------- */

.verse {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.4rem, 3vw, 2rem);
  margin: 1.8rem 0;
}

.verse .arabic {
  font-family: var(--arabic);
  direction: rtl;
  text-align: right;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  line-height: 2.05;
  margin: 0 0 1rem;
  color: var(--ink);
}

.verse .translation {
  font-size: 1.02rem;
  color: var(--ink-soft);
  margin: 0;
}

.verse cite {
  display: block;
  margin-top: .9rem;
  font-family: var(--sans);
  font-style: normal;
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- Cards ---------- */

.grid {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
}

.card {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  padding: 1.5rem 1.4rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.card .kicker {
  font-family: var(--sans);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--brass);
}

.card h3 { margin: 0; }

.card p {
  margin: 0;
  font-size: .92rem;
  color: var(--muted);
}

.card .more {
  margin-top: auto;
  padding-top: .9rem;
  font-family: var(--sans);
  font-size: .8rem;
  font-weight: 500;
  color: var(--accent);
}

/* ---------- Principles ---------- */

.principles {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  counter-reset: p;
}

.principle { counter-increment: p; }

.principle::before {
  content: counter(p, decimal-leading-zero);
  display: block;
  font-family: var(--sans);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--brass);
  margin-bottom: .5rem;
}

.principle h3 { font-size: 1.05rem; }

.principle p {
  font-size: .93rem;
  color: var(--muted);
  margin: 0;
}

/* ---------- Author strip ---------- */

.author-strip {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  padding: clamp(1.5rem, 4vw, 2.6rem);
}

.author-strip h2 { margin-bottom: .35rem; }

.author-strip .role {
  font-family: var(--sans);
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--brass);
  margin-bottom: 1rem;
}

/* ---------- Article ---------- */

.article-head {
  padding-block: clamp(2rem, 5vw, 3.4rem) 0;
}

.breadcrumb {
  font-family: var(--sans);
  font-size: .78rem;
  color: var(--muted);
  margin-bottom: 1.4rem;
}

.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin-inline: .45rem; opacity: .6; }

.article-head h1 { font-size: clamp(2rem, 4.4vw, 3.1rem); }

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.2rem;
  font-family: var(--sans);
  font-size: .78rem;
  color: var(--muted);
  margin-top: 1.2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}

.article-body { padding-block: clamp(2rem, 4vw, 3rem); }

.article-body h2 {
  font-size: 1.5rem;
  margin-top: 2.4rem;
}

.article-body h2:first-child { margin-top: 0; }

.article-body ul, .article-body ol {
  padding-left: 1.2rem;
  margin: 0 0 1.3em;
}

.article-body li { margin-bottom: .55em; padding-left: .2rem; }

.callout {
  border-left: 3px solid var(--brass);
  background: var(--brass-soft);
  padding: 1rem 1.2rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.8rem 0;
  font-size: .95rem;
}

.callout strong {
  font-family: var(--sans);
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: .4rem;
  color: var(--brass);
}

.refs {
  font-family: var(--sans);
  font-size: .82rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 1.2rem;
  margin-top: 2.5rem;
}

.refs ol { padding-left: 1.1rem; }
.refs li { margin-bottom: .5em; }

.article-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--line);
  padding-top: 1.6rem;
  margin-top: 2.5rem;
  font-family: var(--sans);
  font-size: .82rem;
}

/* ---------- Sign index ---------- */

.field-group { margin-bottom: 2.6rem; }

.field-head {
  display: flex;
  align-items: baseline;
  gap: .8rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: .6rem;
  margin-bottom: 1rem;
}

.field-head h2 { font-size: 1.15rem; margin: 0; }

.field-head .count {
  font-family: var(--sans);
  font-size: .75rem;
  color: var(--muted);
  margin-left: auto;
}

.sign-list { list-style: none; margin: 0; padding: 0; }

.sign-list li + li { border-top: 1px solid var(--line); }

.sign-list a {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: baseline;
  padding: .95rem 0;
  text-decoration: none;
  color: inherit;
}

.sign-list .ref {
  font-family: var(--sans);
  font-size: .75rem;
  color: var(--brass);
  letter-spacing: .04em;
}

.sign-list .title { font-size: 1.02rem; }

.sign-list .hint {
  font-family: var(--sans);
  font-size: .76rem;
  color: var(--muted);
  white-space: nowrap;
}

.sign-list a:hover .title { color: var(--accent); }

.sign-row {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: baseline;
  padding: .95rem 0;
  color: var(--muted);
}

.sign-row .ref { color: color-mix(in srgb, var(--brass) 65%, var(--muted)); }
.sign-row .hint {
  font-family: var(--sans);
  font-size: .72rem;
  letter-spacing: .04em;
  font-style: italic;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: clamp(2rem, 5vw, 4rem);
  padding-block: 2.6rem;
  font-family: var(--sans);
  font-size: .8rem;
  color: var(--muted);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 3rem;
  justify-content: space-between;
  align-items: flex-start;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.4rem;
}

.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--accent); }

.footer-note {
  max-width: 46ch;
  margin: .8rem 0 0;
  line-height: 1.6;
}

/* ---------- Motion ---------- */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity .6s ease, transform .6s ease;
  }
  .reveal.is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-aside { border-left: 0; border-top: 1px solid var(--line); padding-left: 0; padding-top: 1.4rem; }
  .author-strip { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  body { font-size: 17.5px; }
  .header-inner { padding: .7rem 1.1rem; }
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: .4rem 1.1rem 1rem;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: .65rem 0; width: 100%; border-bottom: 1px solid var(--line); }
  .nav-toggle { display: inline-block; }
  .sign-list a { grid-template-columns: 2.6rem minmax(0, 1fr); }
  .sign-list .hint { display: none; }
  .sign-row { grid-template-columns: 2.6rem minmax(0, 1fr); }
  .sign-row .hint { display: none; }
  .wrap { padding: 0 1.1rem; }
}

@media print {
  .site-header, .site-footer, .hero-actions, .nav-toggle { display: none; }
  body { background: #fff; color: #000; font-size: 11pt; }
  a { color: #000; }
}