:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1c1f24;
  --muted: #69707d;
  --border: #e2e5ea;
  --accent: #2f6fdf;
  --accent-soft: #e3ecfc;
  --error: #b3261e;
  --radius: 12px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --surface: #1b1e24;
    --text: #e8eaee;
    --muted: #9aa1ad;
    --border: #2c3038;
    --accent: #7aa7ff;
    --accent-soft: #22324f;
    --error: #ff8a80;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

main { max-width: 1200px; margin: 0 auto; padding: 16px; }

h1 { font-size: 1.6rem; margin: 0; }
h2 { font-size: 1.05rem; margin: 0 0 8px; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; margin: 0 0 8px; }

.topbar {
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
  padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.topbar nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
.topbar nav a {
  color: var(--muted); text-decoration: none; padding: 6px 12px; border-radius: 8px;
}
.topbar nav a:hover { color: var(--text); }
.topbar nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }
.logout { display: flex; align-items: center; gap: 8px; margin: 0; }

footer { max-width: 1200px; margin: 0 auto; padding: 8px 16px 32px; font-size: 0.85rem; }

.page-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; margin: 8px 0 16px;
}
.controls { display: flex; align-items: flex-end; gap: 12px; flex-wrap: wrap; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; margin-bottom: 16px;
}
.card-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; flex-wrap: wrap; }

.cards {
  display: grid; gap: 16px; margin-bottom: 16px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.cards .card { margin: 0; }
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat .label { color: var(--muted); font-size: 0.85rem; }
.stat .value { font-size: 1.5rem; font-weight: 650; font-variant-numeric: tabular-nums; }
.stat .sub { color: var(--muted); font-size: 0.8rem; min-height: 1.2em; }
.stat.highlight { background: var(--accent-soft); border-color: transparent; }

.chart { width: 100%; height: 320px; }
.chart.tall { height: 440px; }

.controls-card { display: flex; flex-wrap: wrap; gap: 12px 16px; align-items: flex-end; }
.control { display: flex; flex-direction: column; gap: 2px; font-size: 0.8rem; color: var(--muted); }

input, select, button, .button {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px;
}
button, .button { cursor: pointer; text-decoration: none; display: inline-block; }
button:hover, .button:hover { border-color: var(--accent); }
button.link { border: none; background: none; color: var(--accent); padding: 0; }
.button.secondary { margin-left: auto; }
.button.disabled { opacity: 0.5; pointer-events: none; }

.presets { display: flex; gap: 0; flex-wrap: wrap; }
.presets button { border-radius: 0; margin-left: -1px; }
.presets button:first-child { border-radius: 8px 0 0 8px; margin-left: 0; }
.presets button:last-child { border-radius: 0 8px 8px 0; }
.presets button.active { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); position: relative; }

fieldset.zones { border: none; padding: 0; margin: 0; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
fieldset.zones legend { font-size: 0.8rem; color: var(--muted); padding: 0; margin-bottom: 2px; }

.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
th, td { text-align: right; padding: 6px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { color: var(--muted); font-weight: 500; font-size: 0.85rem; }

.login { max-width: 360px; margin: 12vh auto 0; display: flex; flex-direction: column; gap: 12px; }
.login label { display: flex; flex-direction: column; gap: 4px; font-size: 0.9rem; }
.login button { background: var(--accent); color: #fff; border: none; padding: 10px; font-weight: 600; }
.error { color: var(--error); margin: 0; }
.takeaway { font-weight: 600; margin: 0 0 4px; min-height: 1.5em; }

@media (max-width: 640px) {
  .topbar { gap: 8px; }
  .chart { height: 260px; }
  .chart.tall { height: 360px; }
  .button.secondary { margin-left: 0; }
}