:root {
  color-scheme: light;
  --bg: #f4f1eb;
  --surface: #fffdfa;
  --surface-soft: #f8f6f1;
  --surface-inset: #f1eee7;
  --border: #d9d4ca;
  --border-strong: #b9b1a4;
  --text: #242521;
  --muted: #6c6b64;
  --accent: #315f59;
  --accent-soft: #e0ebe6;
  --danger: #9b493e;
  --accent-deep: #214943;
  --radius: 10px;
  --shadow: 0 8px 24px rgb(49 42 31 / 7%);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
button, a, input, select { -webkit-tap-highlight-color: transparent; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 "Aptos", "Segoe UI", Inter, ui-sans-serif, system-ui, sans-serif;
}
main { width: min(1160px, 100%); margin: 0 auto; padding: 54px 28px 96px; }
.masthead { position: relative; padding: 12px 0 32px; border-bottom: 1px solid var(--border-strong); }
.masthead-copy { max-width: 700px; }
.eyebrow, .section-kicker {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}
h1, h2, h3, .eyebrow, .section-kicker, nav a, button, label { font-family: "Aptos Display", "Aptos", "Segoe UI", Inter, ui-sans-serif, system-ui, sans-serif; }
h1 { margin: 0; font-size: clamp(2.7rem, 7vw, 5.4rem); line-height: .98; letter-spacing: -.065em; font-weight: 700; }
h1 span { color: var(--accent); }
h2 { margin: 0; font-size: 1.55rem; line-height: 1.2; letter-spacing: -.025em; }
h3 { margin: 0 0 8px; font-size: 1rem; }
p { margin: 10px 0; }
.lede { max-width: 590px; margin-top: 22px; color: var(--muted); font-size: 1.08rem; }
.muted { color: var(--muted); }
.masthead-note { position: absolute; top: 16px; right: 0; display: flex; align-items: center; gap: 8px; color: var(--accent); font-size: .78rem; font-weight: 600; }
.masthead-note small { color: var(--muted); font-weight: 400; }
.signal { width: 8px; height: 8px; background: #688f71; border-radius: 50%; }
nav { display: flex; flex-wrap: wrap; gap: 24px; margin-top: 34px; }
nav a { position: relative; color: var(--muted); text-decoration: none; font-size: .88rem; font-weight: 600; }
nav a::after { position: absolute; right: 0; bottom: -8px; left: 0; height: 2px; background: var(--accent); content: ""; transform: scaleX(0); transform-origin: left; transition: transform .18s ease; }
nav a:hover, nav a:focus-visible { color: var(--accent-deep); }
nav a:hover::after, nav a:focus-visible::after { transform: scaleX(1); }
.panel { margin-top: 28px; padding: 30px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel > h2 { position: relative; padding-left: 14px; }
.panel > h2::before { position: absolute; top: .15em; bottom: .15em; left: 0; width: 3px; background: var(--accent); border-radius: 2px; content: ""; }
.section-kicker { margin-bottom: 10px; color: var(--muted); letter-spacing: .1em; }
.section-heading { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; margin-bottom: 22px; }
.status { color: var(--accent); font-size: .86rem; font-weight: 700; }
.action-grid, .chart-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.action-grid article, .chart-grid article { padding: 20px; background: var(--surface-soft); border: 1px solid var(--border); border-radius: 7px; transition: border-color .18s ease, box-shadow .18s ease, background .18s ease; }
.action-grid article:hover, .action-grid article:focus-within { background: var(--surface); border-color: #9eb5ac; box-shadow: 0 8px 18px rgb(49 42 31 / 8%); }
.chart-grid article:hover { border-color: #b8c8c0; }
.action-grid article p { min-height: 50px; color: var(--muted); }
.plan-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.plan-day { padding: 20px; background: var(--surface-soft); border: 1px solid var(--border); border-radius: 7px; }
.plan-day-head { display: flex; gap: 12px; align-items: baseline; }
.plan-day-head span { color: var(--accent); font-size: .74rem; font-weight: 700; letter-spacing: .12em; }
.plan-day-head strong { font-family: "Aptos Display", "Aptos", "Segoe UI", Inter, ui-sans-serif, system-ui, sans-serif; }
.plan-day p { color: var(--muted); }
.plan-day pre { margin: 14px 0; padding: 12px; overflow-x: auto; color: #41443d; background: #ebe8e0; border: 1px solid var(--border); border-radius: 6px; font-size: .78rem; line-height: 1.45; }
.plan-day code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.plan-day ul, .plan-success ul { padding-left: 22px; color: var(--muted); }
.plan-success { margin-top: 14px; padding: 20px; background: var(--accent-soft); border: 1px solid #b8c8c0; border-radius: 7px; }
.plan-success h3 { color: var(--accent-deep); }
#training-form { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 17px; }
label { color: var(--muted); font-size: .83rem; font-weight: 600; }
input, select, button { width: 100%; margin-top: 6px; padding: 10px 12px; border-radius: 6px; font: inherit; }
input, select { color: var(--text); background: var(--surface); border: 1px solid var(--border-strong); outline: none; }
input:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgb(49 95 89 / 12%); }
button { border: 1px solid var(--accent); background: var(--accent); color: #fff; font-weight: 700; cursor: pointer; transition: background .18s ease, border-color .18s ease, box-shadow .18s ease, color .18s ease; }
button:hover:not(:disabled), button:focus-visible { background: var(--accent-deep); box-shadow: 0 4px 10px rgb(33 73 67 / 18%); }
button:disabled { opacity: .45; cursor: not-allowed; }
button.secondary { color: var(--accent); background: transparent; border-color: var(--border-strong); }
button.secondary:hover:not(:disabled), button.secondary:focus-visible { color: var(--accent-deep); background: var(--accent-soft); border-color: var(--accent); box-shadow: 0 4px 10px rgb(49 95 89 / 10%); }
#start::after, .action-grid button::after { margin-left: 9px; content: "→"; font-size: 1.05em; }
button.danger { margin-top: 8px; color: var(--danger); background: transparent; border-color: #c49b94; }
button.danger:hover:not(:disabled), button.danger:focus-visible { color: #7f362e; background: #f6e8e5; border-color: var(--danger); box-shadow: none; }
.check { display: flex; align-items: center; align-self: end; gap: 9px; }
.check input { width: auto; margin: 0; accent-color: var(--accent); }
.form-actions { align-self: end; }
canvas { display: block; width: 100%; min-height: 180px; background: var(--surface); border-radius: 4px; }
.legend { color: var(--muted); white-space: nowrap; font-size: .86rem; }
.legend i { display: inline-block; width: 9px; height: 9px; margin-right: 5px; background: var(--accent); border-radius: 50%; }
#runs { display: grid; gap: 8px; }
.run { text-align: left; color: var(--text); background: var(--surface-soft); border-color: var(--border); }
.run { transition: border-color .18s ease, background .18s ease; }
.run:hover, .run:focus-visible { border-color: var(--accent); background: var(--accent-soft); }
.docs-layout { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 18px; align-items: start; }
#doc-list { display: grid; gap: 7px; align-content: start; }
.doc-button { text-align: left; color: var(--muted); background: var(--surface-soft); border-color: var(--border); text-transform: capitalize; }
.doc-button { transition: border-color .18s ease, background .18s ease, color .18s ease; }
.doc-button.active, .doc-button:hover, .doc-button:focus-visible { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
#doc-content { min-height: 420px; padding: 26px 30px; overflow: auto; background: var(--surface-soft); border: 1px solid var(--border); border-radius: 7px; }
.documentation h1, .documentation h2, .documentation h3 { margin: 0 0 12px; color: var(--text); }
.documentation h1 { font-size: 1.8rem; }
.documentation h2 { margin-top: 28px; font-size: 1.35rem; }
.documentation h3 { margin-top: 22px; font-size: 1.08rem; }
.documentation p, .documentation ul, .documentation ol { color: #555750; }
.documentation ul, .documentation ol { padding-left: 24px; }
.documentation li { margin: 5px 0; }
.documentation a { color: var(--accent); }
.documentation code { padding: 2px 5px; color: var(--accent); background: var(--accent-soft); border-radius: 3px; font: .9em ui-monospace, SFMono-Regular, Consolas, monospace; }
.documentation pre { padding: 15px 17px; overflow-x: auto; color: #41443d; background: #ebe8e0; border: 1px solid var(--border); border-radius: 6px; }
.documentation pre code { padding: 0; background: none; }
.documentation table { width: 100%; margin: 16px 0; border-collapse: collapse; }
.documentation th, .documentation td { padding: 9px 11px; text-align: left; border: 1px solid var(--border); }
.documentation th { color: var(--accent); background: var(--accent-soft); }
@media (max-width: 700px) {
  main { padding: 32px 14px 60px; }
  .masthead-note { position: static; margin-top: 22px; }
  .panel { padding: 20px; }
  .plan-grid { grid-template-columns: 1fr; }
  .action-grid, .chart-grid, .docs-layout { grid-template-columns: 1fr; }
  .section-heading { display: block; }
  #doc-content { padding: 20px; }
}