:root {
  color-scheme: light;
  --ink: #334155;
  --muted: #64748b;
  --line: #e5dfdb;
  --paper: #fbfaf8;
  --merlot: #b0202b;
  --rose-wash: #f8e8e9;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, sans-serif;
}

.page-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 80px;
}

.hero { margin-bottom: 38px; }
.hero-top { display: flex; align-items: center; justify-content: space-between; }
.eyebrow { margin: 0 0 12px; color: var(--merlot); font-size: 12px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(36px, 6vw, 64px); letter-spacing: -.045em; line-height: 1; }
.intro { margin: 18px 0 0; color: var(--muted); font-size: 18px; }
.github-mark { display: inline-flex; color: #111827; }
.github-mark svg { width: 32px; height: 30px; fill: currentColor; }
.github-mark:hover, .github-mark:focus-visible { color: var(--merlot); }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 22px;
}

label { display: grid; gap: 8px; color: var(--muted); font-size: 12px; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; }
select { min-width: 240px; border: 1px solid var(--line); border-radius: 8px; background: white; color: var(--ink); font: inherit; padding: 11px 12px; text-transform: none; }

.chart-card { min-height: 480px; border: 1px solid var(--line); border-radius: 14px; background: white; padding: 28px 30px 22px; box-shadow: 0 18px 50px rgba(65, 38, 32, .06); }
#chart { overflow-x: auto; }
.empty-state { color: var(--muted); padding: 100px 0; text-align: center; }
.updated-at { margin: 18px 0 0; color: var(--muted); font-size: 13px; text-align: right; }

@media (max-width: 640px) {
  .page-shell { width: min(100% - 24px, 1120px); padding-top: 42px; }
  .chart-card { padding: 18px 12px; }
  select { width: 100%; min-width: 0; }
}