/* Standalone styling for static exercise pages and the /exercises/
   browse + taxonomy index. Matches the Gym Tracker app: neutral-dark
   surfaces, azure accent, and the Inter typeface. */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

* { box-sizing: border-box; }

:root {
  --bg: #0a0c14;
  --bg-2: #12151d;
  --panel: #181c26;
  --border: #232838;
  --border-strong: #343a4f;
  --text: #f1f3f8;
  --muted: #a4adbd;
  --accent: #5b9bff;
  --accent-strong: #2563eb;
  --accent-2: #fbbf24;
}

html, body { margin: 0; padding: 0; }

/* Visible page scrollbar. With meta color-scheme:dark Chrome paints a dark
   native scrollbar that vanishes against the dark page; style it explicitly
   so it reads clearly. */
html {
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.28) transparent;
}
html::-webkit-scrollbar { width: 10px; }
html::-webkit-scrollbar-track { background: transparent; }
html::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.28); border-radius: 999px;
}
html::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.45); }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent); }
a:hover { color: #8fb8ff; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: -9999px; top: -9999px;
  background: var(--accent); color: #fff; padding: 8px 12px; border-radius: 6px;
}
.skip-link:focus { left: 12px; top: 12px; z-index: 1000; }

.page-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px; border-bottom: 1px solid var(--border);
  background: var(--bg-2);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(8px);
}
.brand {
  font-weight: 600; font-size: 17px; text-decoration: none; color: var(--text);
  display: inline-flex; align-items: center; gap: 8px;
}
.page-nav { display: flex; gap: 18px; }
.page-nav a { text-decoration: none; color: var(--muted); font-size: 14px; }
.page-nav a:hover, .page-nav a[aria-current="page"] { color: var(--text); }

main { max-width: 1080px; margin: 0 auto; padding: 24px; }

.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 20px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--text); text-decoration: underline; }

/* --- Exercise hero --- */
.exercise-hero { margin-bottom: 24px; }
.exercise-hero h1 {
  font-size: clamp(28px, 4.5vw, 38px); margin: 0 0 10px; line-height: 1.15;
}
.exercise-hero .lede { color: var(--muted); margin: 0 0 18px; max-width: 70ch; font-size: 16px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.primary-btn {
  display: inline-block; padding: 11px 18px; border-radius: 11px;
  text-decoration: none; font-size: 14px; font-weight: 600;
  background: linear-gradient(135deg, #3b82f6 0%, var(--accent-strong) 100%);
  color: #fff;
  box-shadow: 0 8px 20px -8px rgba(37, 99, 235, 0.55);
  transition: filter 0.15s ease, transform 0.08s ease, box-shadow 0.18s ease;
}
.primary-btn:hover {
  color: #fff; filter: brightness(1.08); transform: translateY(-1px);
  box-shadow: 0 10px 24px -8px rgba(37, 99, 235, 0.6);
}

/* --- Fact grid --- */
.facts { margin-bottom: 26px; }
.fact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin: 0;
}
.fact-grid > div {
  background: var(--panel); border: 1px solid var(--border);
  padding: 14px 16px; border-radius: 12px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
}
.fact-grid dt {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--muted); margin-bottom: 4px;
}
.fact-grid dd { margin: 0; font-size: 15px; }
.fact-grid dd a { color: var(--text); text-decoration: none; border-bottom: 1px dotted var(--muted); }
.fact-grid dd a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* --- Related --- */
.related h2 { font-size: 20px; margin: 0 0 12px; }
.related-list {
  list-style: none; margin: 0 0 26px; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 4px 16px;
}
.related-list li a {
  display: block; padding: 8px 12px; text-decoration: none;
  color: var(--text); border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg-2);
}
.related-list li a:hover { background: var(--panel); border-color: var(--accent); }
.related-list .muted { color: var(--muted); font-size: 13px; }

.page-footer-meta {
  margin-top: 26px; padding-top: 20px; border-top: 1px solid var(--border);
  color: var(--text); font-size: 14px;
}
.page-footer-meta a { color: var(--accent); }
.page-footer-meta .muted { color: var(--muted); }

.page-footer {
  max-width: 1080px; margin: 36px auto 60px; padding: 24px;
  color: var(--muted); font-size: 13px;
  border-top: 1px solid var(--border);
}
.page-footer a { color: var(--muted); }
.page-footer a:hover { color: var(--text); }

.footer-more { margin-bottom: 18px; }
.footer-more-heading {
  margin: 0 0 10px; font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--muted); font-weight: 600;
}
.footer-more ul {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 6px 18px;
}
.footer-more li a {
  display: block; padding: 6px 0; text-decoration: none; color: var(--text);
  border-bottom: 1px solid transparent;
}
.footer-more li a:hover { color: var(--accent); }
.footer-more li a strong { font-weight: 600; }
.footer-more li a span { color: var(--muted); font-size: 12px; }
.page-footer .copyright { margin: 0; text-align: center; font-size: 12px; }

/* --- Index/taxonomy pages --- */
.exercises-index .index-hero { margin-bottom: 20px; }
.exercises-index .index-hero h1 { margin: 0 0 8px; font-size: clamp(28px, 4vw, 36px); }
.exercises-index .lede { color: var(--muted); margin: 0; }

.alpha-jump {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 18px 0 26px; padding: 12px 16px;
  background: var(--panel); border-radius: 10px; border: 1px solid var(--border);
}
.alpha-jump a {
  display: inline-block; padding: 4px 10px; border-radius: 6px;
  text-decoration: none; font-weight: 500; font-size: 14px;
  background: var(--bg-2); color: var(--text);
}
.alpha-jump a:hover { background: var(--accent); color: #fff; }

.alpha-group { margin-bottom: 28px; }
.alpha-group h2 {
  margin: 0 0 10px; font-size: 22px; padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.alpha-group h2 a { color: var(--text); text-decoration: none; }
.alpha-group h2 a:hover { color: var(--accent); }
.alpha-group h2 .muted { font-size: 14px; font-weight: 400; color: var(--muted); }

.shows-list {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 4px 16px;
}
.shows-list.grid-2 { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.shows-list li a {
  display: block; padding: 6px 0; text-decoration: none;
  color: var(--text);
}
.shows-list li a:hover { color: var(--accent); }
.shows-list .muted { color: var(--muted); font-size: 13px; }

.index-footer { margin-top: 28px; color: var(--muted); font-size: 14px; }

@media (max-width: 700px) {
  main { padding: 16px; }
}