/* Scientific Sports - site chrome.
   One measured column, journal-cover masthead, light and dark. */

:root {
  --paper: #fbfaf7;
  --paper-sunk: #f3f1ec;
  --ink: #17171b;
  --ink-soft: #55555f;
  --ink-faint: #86868f;
  --rule: #d9d5cc;
  --rule-soft: #e8e4db;
  --accent: #24435e;
  --badge-bg: #e9edf2;
  --badge-ink: #24435e;

  --serif: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  --measure: 36rem;
  --shell: 60rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #15161a;
    --paper-sunk: #1d1f24;
    --ink: #e9e7e2;
    --ink-soft: #a8a6a0;
    --ink-faint: #7b7974;
    --rule: #33353c;
    --rule-soft: #26282e;
    --accent: #8fb4d8;
    --badge-bg: #22303d;
    --badge-ink: #a9c8e6;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-feature-settings: "onum" 1, "kern" 1;
}

a { color: var(--accent); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }

/* ---------- masthead ---------- */

.masthead {
  border-bottom: 1px solid var(--rule);
  padding: 3.5rem 1.25rem 1.5rem;
  text-align: center;
}

.masthead .wordmark {
  display: block;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2rem, 7vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--ink);
  text-decoration: none;
  margin: 0;
}

.masthead .tagline {
  margin: 0.9rem 0 0;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.masthead .imprint {
  margin: 0.35rem 0 0;
  font-family: var(--sans);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.cover-band {
  height: clamp(6rem, 22vw, 13rem);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  border-bottom: 1px solid var(--rule);
  filter: saturate(0.85);
}

/* ---------- nav ---------- */

.sitenav {
  border-bottom: 1px solid var(--rule);
  background: var(--paper-sunk);
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.sitenav ul {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  justify-content: center;
}

.sitenav a { color: var(--ink-soft); text-decoration: none; }
.sitenav a:hover, .sitenav a[aria-current="page"] { color: var(--accent); text-decoration: underline; }

.crumbs {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 1rem 1.25rem 0;
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-faint);
}
.crumbs a { color: var(--ink-soft); }

/* ---------- layout ---------- */

main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.prose { max-width: var(--measure); }
.prose p { margin: 0 0 1.1em; }

h1, h2, h3, h4 { font-weight: 600; line-height: 1.25; letter-spacing: -0.01em; }

main > h1 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  margin: 0 0 1.5rem;
  max-width: var(--measure);
}

.section-head {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.5rem;
  margin: 3rem 0 1.25rem;
}
.section-head:first-of-type { margin-top: 0; }

/* ---------- issue / volume listings ---------- */

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

.toc > li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.toc > li:first-child { padding-top: 0.25rem; }

.badge {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--badge-ink);
  background: var(--badge-bg);
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  margin-bottom: 0.5rem;
}

.toc .title {
  display: block;
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 0.3rem;
}
.toc .title a { color: var(--ink); text-decoration: none; }
.toc .title a:hover { color: var(--accent); text-decoration: underline; }

.toc .byline {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin: 0 0 0.5rem;
}

.toc .links {
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  align-items: baseline;
}

.issue-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr));
  gap: 1px;
  background: var(--rule-soft);
  border: 1px solid var(--rule-soft);
}

.issue-grid li { background: var(--paper); }

.issue-grid a {
  display: block;
  padding: 1rem 1.1rem;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
}
.issue-grid a:hover { background: var(--paper-sunk); }

.issue-grid .vol {
  display: block;
  font-weight: 600;
  font-size: 1rem;
}
.issue-grid .meta {
  display: block;
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin-top: 0.2rem;
}

.empty {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--ink-faint);
  font-style: normal;
  padding: 1rem 0;
}

/* ---------- article abstract page ---------- */

.article-head { max-width: var(--measure); margin-bottom: 2rem; }
.article-head h1 { font-size: clamp(1.5rem, 3.6vw, 2rem); margin: 0.6rem 0 0.9rem; }

.authors { margin: 0 0 0.4rem; font-size: 1.02rem; }
.affil { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }

.pubinfo {
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-faint);
  margin: 1rem 0 0;
  padding-top: 0.8rem;
  border-top: 1px solid var(--rule-soft);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.75rem 0 0;
}

.actions a {
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.5rem 0.95rem;
  border: 1px solid var(--rule);
  border-radius: 2px;
  color: var(--ink);
}
.actions a:hover { border-color: var(--accent); color: var(--accent); }
.actions a.primary { background: var(--accent); border-color: var(--accent); color: var(--paper); }
.actions a.primary:hover { opacity: 0.88; color: var(--paper); }

pre.cite {
  max-width: var(--measure);
  background: var(--paper-sunk);
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  padding: 0.9rem 1rem;
  font-size: 0.78rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---------- footer ---------- */

.sitefoot {
  border-top: 1px solid var(--rule);
  margin-top: 4rem;
  padding: 2.5rem 1.25rem 3.5rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-faint);
  text-align: center;
}
.sitefoot p { margin: 0 0 0.4rem; max-width: var(--shell); margin-inline: auto; }
.sitefoot a { color: var(--ink-soft); }

@media (max-width: 32rem) {
  .masthead { padding-top: 2.25rem; }
  main { padding-top: 1.75rem; }
}

.issue-intro {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.issue-cover {
  flex: 0 0 auto;
  width: 8.5rem;
  height: auto;
  border: 1px solid var(--rule);
  background: var(--paper-sunk);
}

.issue-intro .pubinfo { margin-top: 0; padding-top: 0; border-top: 0; }

@media (max-width: 32rem) {
  .issue-intro { flex-direction: column; gap: 1rem; }
  .issue-cover { width: 6.5rem; }
}