:root {
  --bg: #eef1ea;
  --surface: #ffffff;
  --text: #1c2119;
  --muted: #5d6657;
  --border: #d5dbcf;
  --accent: #4f6b2f;
  --accent-contrast: #ffffff;
  --header: #1f2a1c;
  --header-text: #eef1ea;
  --ok: #2f7d32;
  --ok-bg: #e3f2e1;
  --info: #1f5f8b;
  --info-bg: #e1eef7;
  --warn: #8a5a00;
  --warn-bg: #fdf1d6;
  --danger: #b3261e;
  --danger-bg: #fbe3e1;
  --radius: 14px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121510;
    --surface: #1c2119;
    --text: #e6eae2;
    --muted: #a3ad9b;
    --border: #333b2e;
    --accent: #8fb35a;
    --accent-contrast: #121510;
    --header: #0c0e0a;
    --ok: #7ccc7f;
    --ok-bg: #1d3320;
    --info: #7fb9e3;
    --info-bg: #16293a;
    --warn: #f0c060;
    --warn-bg: #3a2e12;
    --danger: #f28b82;
    --danger-bg: #3c1a18;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding-bottom: env(safe-area-inset-bottom);
}

.app-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: calc(12px + env(safe-area-inset-top)) 16px 12px;
  background: var(--header);
  color: var(--header-text);
}
.app-header h1 { margin: 0; font-size: 1.15rem; line-height: 1.2; }
.subtitle { margin: 0; font-size: .8rem; opacity: .75; }
.install-btn {
  margin-left: auto;
  flex-shrink: 0;
  font: inherit;
  font-size: .85rem;
  font-weight: 700;
  border: 0;
  border-radius: 999px;
  padding: 8px 14px;
  min-height: 36px;
  background: #8fb35a;
  color: #121510;
  cursor: pointer;
}
.install-btn[hidden] { display: none; }
.install-btn:focus-visible { outline: 2px solid #eef1ea; outline-offset: 2px; }

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.card h2 { margin: 0 0 8px; font-size: 1rem; }

fieldset { border: 0; margin: 0 0 16px; padding: 0; }
legend, .field > label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 6px;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  background: var(--bg);
  padding: 4px;
  border-radius: 10px;
}
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented span {
  display: block;
  text-align: center;
  padding: 8px 4px;
  border-radius: 8px;
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
  user-select: none;
}
.segmented input:checked + span { background: var(--accent); color: var(--accent-contrast); }
.segmented input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 380px) { .grid-2 { grid-template-columns: 1fr; } }

select, input[type="number"] {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  min-height: 44px;
}
select:focus, input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.input-unit { position: relative; }
.input-unit input { padding-right: 52px; }
.input-unit span {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: .85rem;
  pointer-events: none;
}

input[type="range"] { width: 100%; accent-color: var(--accent); min-height: 32px; }
output { color: var(--text); }

.result { text-align: center; }
.result-label { margin: 0; color: var(--muted); font-size: .85rem; font-weight: 600; }
.result-time {
  margin: 4px 0;
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.result-sub { margin: 0 0 12px; color: var(--muted); }

.crate {
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 12px;
  font-size: .9rem;
}
.crate-value { font-weight: 800; white-space: nowrap; }
.crate[data-level="ok"] { background: var(--ok-bg); color: var(--ok); }
.crate[data-level="trickle"] { background: var(--info-bg); color: var(--info); }
.crate[data-level="caution"] { background: var(--warn-bg); color: var(--warn); }
.crate[data-level="danger"] { background: var(--danger-bg); color: var(--danger); }

.crate-help { margin: -6px 0 12px; text-align: left; font-size: .8rem; color: var(--muted); }
.crate-help summary { cursor: pointer; width: fit-content; margin-left: auto; color: var(--accent); }
.crate-help p { margin: 6px 0 0; }

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 0;
  text-align: left;
}
.stats div { background: var(--bg); border-radius: 10px; padding: 8px 10px; }
.stats dt { font-size: .75rem; color: var(--muted); }
.stats dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; }

.errors {
  background: var(--danger-bg);
  color: var(--danger);
  border-radius: 10px;
  padding: 10px 12px;
  text-align: left;
}
.errors p { margin: 0; }

.hint { margin: 6px 0 0; font-size: .8rem; color: var(--muted); }

.voltage-result {
  margin: 8px 0 0;
  border-radius: 10px;
  padding: 8px 12px;
  font-size: .9rem;
  font-weight: 600;
}
.voltage-result[hidden] { display: none; }
.voltage-result[data-level="ok"] { background: var(--ok-bg); color: var(--ok); }
.voltage-result[data-level="caution"] { background: var(--warn-bg); color: var(--warn); }
.voltage-result[data-level="danger"] { background: var(--danger-bg); color: var(--danger); }

.note {
  margin: 0;
  background: var(--info-bg);
  color: var(--info);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: .9rem;
}
.note[hidden] { display: none; }

.ref-table { margin-top: 8px; font-size: .85rem; }
.ref-table summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.ref-table table { width: 100%; margin-top: 6px; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.ref-table th, .ref-table td { text-align: left; padding: 4px 8px; border-bottom: 1px solid var(--border); }
.ref-table th { color: var(--muted); font-weight: 600; }

.tips { margin: 0; padding-left: 20px; }
.tips li { margin-bottom: 4px; }

.disclaimer { margin: 0; font-size: .8rem; color: var(--muted); }

.update-banner {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}
.update-banner[hidden] { display: none; }
.update-banner button {
  font: inherit;
  border: 0;
  border-radius: 8px;
  padding: 6px 12px;
  background: var(--accent-contrast);
  color: var(--accent);
  cursor: pointer;
}