:root {
  --bg: #f7f8f7;
  --surface: #ffffff;
  --surface-2: #f0f3f2;
  --ink: #16201e;
  --ink-2: #4a5654;
  --line: #dfe5e3;
  --accent: #0b6e69;
  --accent-ink: #ffffff;
  --accent-soft: #e2f1ef;
  --ok: #1d7a3e; --ok-soft: #e6f4ea;
  --warn: #9a5b00; --warn-soft: #fdf2dc;
  --bad: #b3261e; --bad-soft: #fbe9e7;
  --info: #235a97; --info-soft: #e8f0fa;
  --logo-ink: #ffffff;
  --radius: 12px;
  --shadow: 0 1px 2px rgb(0 0 0 / .04), 0 4px 16px rgb(0 0 0 / .04);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1413; --surface: #161d1c; --surface-2: #1c2524; --ink: #e6ecea; --ink-2: #a3b0ad; --line: #2a3533;
    --accent: #3cc0b5; --accent-ink: #062321; --accent-soft: #15302d;
    --ok: #5cc98a; --ok-soft: #13291c; --warn: #f0b457; --warn-soft: #2e2412; --bad: #f28b82; --bad-soft: #321a18;
    --info: #8ab4f8; --info-soft: #172336; --logo-ink: #062321;
    --shadow: none; color-scheme: dark;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
h1, h2, h3 { line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.7rem, 4vw, 2.3rem); margin: .4rem 0 .5rem; }
h2 { font-size: 1.35rem; margin: 2rem 0 .6rem; }
h3 { font-size: 1.05rem; margin: 1.2rem 0 .4rem; }
code { background: var(--surface-2); padding: .05em .35em; border-radius: 4px; font-size: .92em; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 16px; }
.small { font-size: .875rem; }
.muted { color: var(--ink-2); }
.ok { color: var(--ok); } .bad { color: var(--bad); } .warn { color: var(--warn); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; } .skip:focus { left: 16px; top: 8px; background: var(--surface); padding: 8px; z-index: 9; }
.row { display: flex; align-items: center; } .gap { gap: 12px; flex-wrap: wrap; }

.site-header { background: var(--surface); border-bottom: 1px solid var(--line); }
.header-row { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.logo { display: flex; align-items: center; gap: 8px; color: var(--accent); text-decoration: none; font-size: 1.15rem; }
.logo span { color: var(--ink); } .logo b { color: var(--accent); }
.top-nav { display: flex; gap: 18px; } .top-nav a { color: var(--ink); text-decoration: none; font-size: .95rem; }
.top-nav a:hover { color: var(--accent); }

main { padding-top: 12px; padding-bottom: 40px; }
.crumbs { margin-top: 8px; color: var(--ink-2); } .crumbs a { color: var(--ink-2); }
.lede { font-size: 1.1rem; color: var(--ink-2); margin: 0 0 .3rem; max-width: 68ch; }
.checked { margin: 0 0 16px; }
h1 { max-width: 30ch; }

/* Wide screens: inputs + trips on the left, live results on the right. */
@media (min-width: 960px) {
  .tool {
    display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); grid-template-rows: auto 1fr;
    grid-template-areas: 'inputs results' 'trips results' 'foot foot'; column-gap: 32px; align-items: start; padding: 24px;
  }
  .tool-inputs { grid-area: inputs; }
  .trips { grid-area: trips; }
  .results { grid-area: results; margin-top: 0; position: sticky; top: 16px; }
  .tool-foot { grid-area: foot; }
}

/* Tool */
.tool { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; margin: 12px 0 28px; }
.tool-inputs { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px 18px; margin-bottom: 8px; }
.field { display: flex; flex-direction: column; gap: 4px; border: 0; padding: 0; margin: 0; min-width: 0; }
.field label, .field legend { font-weight: 600; font-size: .92rem; padding: 0; }
.field small { color: var(--ink-2); font-size: .8rem; line-height: 1.35; }
.radios { display: flex; flex-direction: column; gap: 4px; font-size: .92rem; }
.radios label { font-weight: 400; display: flex; gap: 6px; align-items: flex-start; }
input[type=date], input[type=number], input[type=text], textarea {
  font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
  padding: 8px 10px; min-height: 42px; width: 100%;
}
input:focus-visible, textarea:focus-visible, button:focus-visible, summary:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn { font: inherit; font-size: .9rem; font-weight: 600; background: var(--accent); color: var(--accent-ink); border: 1px solid var(--accent); border-radius: 8px; padding: 8px 14px; cursor: pointer; min-height: 40px; }
.btn-ghost { background: transparent; color: var(--accent); border-color: var(--line); }
.btn:hover { filter: brightness(1.05); }
.icon-btn { background: none; border: 1px solid transparent; color: var(--ink-2); font-size: 1.4rem; line-height: 1; width: 40px; height: 40px; border-radius: 8px; cursor: pointer; }
.icon-btn:hover { background: var(--bad-soft); color: var(--bad); }

.trips { border-top: 1px solid var(--line); margin-top: 14px; padding-top: 8px; }
.trips-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.trips-head h3 { margin: .6rem 0 .3rem; }
.trip-row { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr) 84px 40px; gap: 8px; align-items: center; margin-bottom: 6px; }
.trip-hdr { font-size: .8rem; font-weight: 600; color: var(--ink-2); margin-bottom: 2px; }
.trip-row input { min-width: 0; }
.trip-len .unit { display: none; }
.trip-len { text-align: right; font-variant-numeric: tabular-nums; color: var(--ink-2); font-size: .92rem; }
.trip-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: flex-start; margin-top: 8px; }
.bulk summary { list-style: none; } .bulk summary::-webkit-details-marker { display: none; }
.bulk[open] { flex-basis: 100%; order: 5; }
.bulk-box { margin-top: 8px; display: grid; gap: 8px; }

.results { margin-top: 18px; display: grid; gap: 12px; }
.result { border-radius: 10px; padding: 12px 14px; border: 1px solid var(--line); background: var(--surface-2); }
.result-title { font-weight: 700; display: flex; gap: 10px; align-items: flex-start; font-size: 1.02rem; }
.badge { flex: none; width: 24px; height: 24px; border-radius: 50%; display: inline-grid; place-items: center; font-size: .8rem; color: #fff; background: var(--info); margin-top: 1px; }
.result-ok { background: var(--ok-soft); border-color: transparent; } .result-ok .badge { background: var(--ok); }
.result-warn { background: var(--warn-soft); border-color: transparent; } .result-warn .badge { background: var(--warn); }
.result-bad { background: var(--bad-soft); border-color: transparent; } .result-bad .badge { background: var(--bad); }
.result-info .badge { background: var(--info); }
@media (prefers-color-scheme: dark) { .badge { color: #0f1413; } }
.result-body { margin: 6px 0 0 34px; } .result-body p { margin: .3rem 0; } .result-body ul { margin: .3rem 0; padding-left: 1.1rem; }
.checks { list-style: none; padding: 0 !important; } .checks li { margin: 4px 0; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 8px 16px; margin: 6px 0 0; }
.stat dt { font-size: .8rem; color: var(--ink-2); } .stat dd { margin: 0; font-weight: 650; font-variant-numeric: tabular-nums; }
.stat.ok dd { color: var(--ok); } .stat.warn dd { color: var(--warn); } .stat.bad dd { color: var(--bad); }
.tool-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 16px; border-top: 1px solid var(--line); padding-top: 12px; }

.chart { margin: 4px 0 0; } .chart svg { width: 100%; height: auto; display: block; }
.chart .line { fill: none; stroke: var(--accent); stroke-width: 2; } .chart .area { fill: var(--accent-soft); }
.chart .line.over { stroke: var(--bad); } .chart .area.over { fill: var(--bad-soft); }
.chart .limit { stroke: var(--bad); stroke-dasharray: 5 4; stroke-width: 1.2; } .chart .base { stroke: var(--line); }
.chart .ax { font-size: 11px; fill: var(--ink-2); } .chart .lim { fill: var(--bad); }

/* Content */
.prose { max-width: 70ch; }
.prose p, .prose li { color: var(--ink); }
.prose table { border-collapse: collapse; width: 100%; font-size: .93rem; margin: .6rem 0 1rem; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; border-bottom: 1px solid var(--line); padding: 6px 10px 6px 0; vertical-align: top; }
.prose th { font-size: .85rem; color: var(--ink-2); }
.callout { background: var(--info-soft); border-radius: 10px; padding: 12px 14px; margin: 1rem 0; }
.callout.warn { background: var(--warn-soft); }
.faq details { border-bottom: 1px solid var(--line); padding: 10px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details > div { margin-top: 6px; color: var(--ink); }
.disclaimer { background: var(--surface-2); border-radius: 10px; padding: 12px 14px; margin: 28px 0; color: var(--ink-2); max-width: 70ch; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.tile { display: flex; flex-direction: column; gap: 4px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; text-decoration: none; color: var(--ink); box-shadow: var(--shadow); }
.tile:hover { border-color: var(--accent); }
.tile strong { color: var(--accent); } .tile span { font-size: .9rem; color: var(--ink-2); }
.tile .eyebrow { font-size: .72rem; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-2); }
.hero { padding: 18px 0 8px; }
.hero h1 { font-size: clamp(1.9rem, 5vw, 2.7rem); max-width: 20ch; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 6px; padding: 0; list-style: none; }
.pills li { background: var(--accent-soft); color: var(--ink); border-radius: 999px; padding: 4px 12px; font-size: .88rem; }
.group-title { margin-top: 1.6rem; }

.site-footer { border-top: 1px solid var(--line); background: var(--surface); padding: 24px 0 32px; margin-top: 24px; }
.foot-nav { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 8px 20px; margin-bottom: 12px; }
.foot-nav h3 { font-size: .85rem; margin: .4rem 0; color: var(--ink-2); text-transform: uppercase; letter-spacing: .04em; }
.foot-nav ul { list-style: none; padding: 0; margin: 0; } .foot-nav li { margin: 2px 0; font-size: .9rem; }
.foot-nav a, .site-footer a { color: var(--ink); } .foot-nav a[aria-current] { color: var(--accent); font-weight: 600; }

@media (max-width: 560px) {
  .tool { padding: 14px 12px; margin-left: -4px; margin-right: -4px; }
  .trip-row { grid-template-columns: minmax(0,1fr) minmax(0,1fr) 36px; gap: 6px; }
  .trip-row input[type=date] { padding: 8px 6px; font-size: .95rem; }
  .trip-len .unit { display: inline; }
  .icon-btn { width: 36px; }
  .lede { font-size: 1.02rem; }
  .trip-row .trip-len { grid-column: 1 / 3; text-align: left; margin-top: -4px; font-size: .82rem; }
  .trip-row .trip-len:empty { display: none; }
  .trip-row .icon-btn { grid-row: 1; grid-column: 3; }
  .trip-hdr span:nth-child(3) { display: none; }
  .result-body { margin-left: 0; }
}
@media print {
  .site-header, .site-footer, .trip-actions, .icon-btn, .tool-foot button, .related, .faq, .crumbs, .skip { display: none !important; }
  body { background: #fff; color: #000; }
  .tool { border: 0; box-shadow: none; padding: 0; display: block !important; }
  .results { position: static !important; margin-top: 18px !important; }
}