:root {
  --bg: #f6f7f9; --card: #fff; --text: #1b1f24; --muted: #667085; --border: #e1e4ea;
  --accent: #1f6feb; --accent-text: #fff; --danger: #c0352b; --elec: #0e9f6e; --fuel: #d9822b;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151a; --card: #1b2028; --text: #e8eaee; --muted: #9aa3b2; --border: #2b323d;
    --accent: #4c8dff; --accent-text: #0b1220; --danger: #ff7b72; --elec: #3ddc97; --fuel: #f0a04b;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.45 system-ui, sans-serif; }
main { max-width: 960px; margin: 0 auto; padding: 16px; }
header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
h1 { font-size: 1.25rem; margin: 0; }
nav { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
nav button { background: var(--card); color: var(--text); border: 1px solid var(--border); padding: 8px 14px; border-radius: 8px; cursor: pointer; }
nav button.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin-bottom: 16px; }
.card h2 { font-size: 1rem; margin: 0 0 12px; }
form { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; align-items: end; }
label { display: flex; flex-direction: column; gap: 4px; font-size: .85rem; color: var(--muted); }
input { font: inherit; padding: 9px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--text); min-width: 0; }
button.primary { font: inherit; padding: 10px 14px; border: 0; border-radius: 8px; background: var(--accent); color: var(--accent-text); cursor: pointer; }
button.link { background: none; border: 0; color: var(--muted); cursor: pointer; font: inherit; }
button.danger { background: none; border: 0; color: var(--danger); cursor: pointer; font: inherit; }
.scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { padding: 8px 10px; text-align: right; border-bottom: 1px solid var(--border); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { color: var(--muted); font-weight: 600; font-size: .8rem; }
.error { color: var(--danger); margin: 8px 0 0; }
.muted { color: var(--muted); }
.login { max-width: 360px; margin: 12vh auto; }
.login form { grid-template-columns: 1fr; }
.elec { color: var(--elec); } .fuel { color: var(--fuel); }