/* Fuel Tracker — design tokens + layout. Light-first (readable at a sunlit pump), dark via media query. */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef1f5;
  --text: #14181f;
  --text-2: #565d6a;
  --text-3: #8a91a0;
  --border: #dfe3ea;
  --primary: #1e40af;
  --primary-ink: #ffffff;
  --series-1: #2a78d6;          /* single-series data hue (validated) */
  --good: #008300;
  --warn-bg: #fff4d6;
  --warn-ink: #7a5300;
  --danger: #dc2626;
  --danger-bg: #fdecec;
  --grid: #e8ebf0;              /* recessive chart gridlines */
  --radius: 10px;
  --shadow: 0 1px 3px rgba(20, 24, 31, 0.08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10141c;
    --surface: #1a2029;
    --surface-2: #232a36;
    --text: #f2f4f8;
    --text-2: #aab2c0;
    --text-3: #79818f;
    --border: #2c3441;
    --primary: #3b82f6;
    --series-1: #3987e5;
    --good: #34c759;
    --warn-bg: #3a2f10;
    --warn-ink: #ffd977;
    --danger: #ef6363;
    --danger-bg: #3a1a1a;
    --grid: #242b37;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { touch-action: manipulation; }
body {
  margin: 0;
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.num { font-variant-numeric: tabular-nums; }

header {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 12px;
  padding: 10px max(16px, env(safe-area-inset-left));
  background: var(--surface); border-bottom: 1px solid var(--border);
}
header h1 { font-size: 18px; margin: 0; flex: 1; }
header h1 a { color: inherit; text-decoration: none; }

main { max-width: 1080px; margin: 0 auto; padding: 16px; padding-bottom: 48px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 44px; padding: 8px 16px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font-size: 16px; cursor: pointer; text-decoration: none;
  transition: background 150ms ease-out, border-color 150ms ease-out;
}
.btn:hover { background: var(--surface-2); }
.btn:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--primary); outline-offset: 1px;
}
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn-primary:hover { filter: brightness(1.1); background: var(--primary); }
.btn-danger { color: var(--danger); border-color: var(--danger); background: transparent; }
.btn:disabled { opacity: 0.45; cursor: default; }

/* banners */
.banner {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 14px; margin-bottom: 14px;
  border-radius: var(--radius); cursor: pointer;
  background: var(--warn-bg); color: var(--warn-ink);
  border: 1px solid color-mix(in srgb, var(--warn-ink) 25%, transparent);
  font-weight: 500;
}
.banner.danger { background: var(--danger-bg); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 30%, transparent); }
.banner svg { flex-shrink: 0; }

/* cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow);
}
a.card { display: block; color: inherit; text-decoration: none; transition: border-color 150ms ease-out; }
a.card:hover { border-color: var(--primary); }
.card h3 { margin: 0 0 2px; font-size: 17px; display: flex; align-items: center; gap: 8px; }
.chip {
  font-size: 12px; font-weight: 600; padding: 1px 8px; border-radius: 99px;
  background: var(--surface-2); color: var(--text-2); white-space: nowrap;
}
.muted { color: var(--text-2); font-size: 14px; }
.cardhead { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.vthumb { width: 56px; height: 56px; border-radius: 8px; object-fit: cover; flex-shrink: 0; }
.vthumb-lg { width: 64px; height: 64px; border-radius: 10px; object-fit: cover; }
.photoph { background: var(--surface-2); border: 1px dashed var(--border); }
.photorow { display: flex; align-items: center; gap: 14px; }
.photorow input[type="file"] { border: none; min-height: auto; padding: 0; background: none; }
.hero-num { font-size: 32px; font-weight: 700; line-height: 1.15; }
.hero-num small { font-size: 14px; font-weight: 500; color: var(--text-2); }
.statrow { display: flex; flex-wrap: wrap; gap: 4px 18px; margin-top: 8px; font-size: 14px; color: var(--text-2); }
.statrow b { color: var(--text); font-weight: 600; }
.cardfoot { display: flex; align-items: flex-end; justify-content: space-between; margin-top: 10px; gap: 12px; }

/* stat tiles */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 14px 0; }
.tile { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; }
.tile .label { font-size: 13px; color: var(--text-2); }
.tile .value { font-size: 24px; font-weight: 700; margin-top: 2px; }
.tile .sub { font-size: 12.5px; color: var(--text-3); margin-top: 2px; }
.delta-up { color: var(--good); font-size: 14px; font-weight: 600; }
.delta-down { color: var(--danger); font-size: 14px; font-weight: 600; }

/* charts */
.chart-card { margin: 14px 0; }
.chart-card h4 { margin: 0 0 10px; font-size: 15px; color: var(--text-2); font-weight: 600; }
.chart-wrap { position: relative; }
.chart-wrap svg { display: block; width: 100%; height: auto; }
#tooltip {
  position: fixed; z-index: 100; pointer-events: none; display: none;
  background: var(--text); color: var(--bg);
  padding: 6px 10px; border-radius: 8px; font-size: 13px; white-space: nowrap;
}

/* tables */
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--text-2); font-weight: 600; font-size: 13px; position: sticky; top: 0; background: var(--surface); }
td.r, th.r { text-align: right; }
tr.rowlink { cursor: pointer; }
tr.rowlink:hover { background: var(--surface-2); }

/* forms */
form.entry { max-width: 560px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 5px; }
.field .help { font-size: 13px; color: var(--text-3); margin-top: 4px; }
input, select, textarea {
  width: 100%; min-height: 44px; padding: 9px 12px; font-size: 16px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: var(--text);
}
input[readonly] { background: var(--surface-2); color: var(--text-2); }
textarea { min-height: 72px; resize: vertical; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.row3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
@media (max-width: 480px) { .row3 { grid-template-columns: 1fr 1fr; } }

/* segmented control (currency toggle, tank status) */
.seg { display: flex; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.seg button {
  flex: 1; min-height: 44px; border: none; background: var(--surface);
  color: var(--text-2); font-size: 15px; font-weight: 600; cursor: pointer;
  transition: background 150ms ease-out;
}
.seg button + button { border-left: 1px solid var(--border); }
.seg button[aria-pressed="true"] { background: var(--primary); color: var(--primary-ink); }

.formfoot { display: flex; gap: 10px; margin-top: 22px; align-items: center; }
.spacer { flex: 1; }

/* login */
.login-wrap { min-height: 70dvh; display: grid; place-items: center; }
.login-wrap .card { width: min(360px, 90vw); }

section.archived { margin-top: 28px; }
section.archived summary { cursor: pointer; color: var(--text-2); font-weight: 600; padding: 6px 0; }
h2.pagetitle { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 4px 0 2px; }
.backlink { color: var(--text-2); text-decoration: none; font-size: 14px; }
.backlink:hover { color: var(--text); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}