:root { font-family: 'Neue Haas Grotesk Text Pro', 'Helvetica Neue', Arial, sans-serif; color: #202923; background: #f7f8f7; font-synthesis: none; }
* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 1080px; margin: auto; padding: 36px 24px; }
header, .history-heading, .meta, footer { display: flex; justify-content: space-between; gap: 16px; align-items: center; }
h1 { font-size: 1.65rem; letter-spacing: -.04em; margin: 0 0 6px; font-weight: 650; }
header p { margin: 0; color: #69716b; overflow-wrap: anywhere; }
h2 { font-size: 1rem; font-weight: 600; margin: 0; }
.status { white-space: nowrap; font-size: .8rem; border-radius: 20px; padding: 7px 11px; background: #e8ece9; }
.status[data-state="online"] { background: #e2f0e7; color: #245c3d; }
.status[data-state="stale"], .status[data-state="offline"] { background: #f4e9dc; color: #805620; }
.readings { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 28px; --battery-color: #69716b; }
.reading, .chart { background: white; border: 1px solid #dee3df; border-radius: 9px; }
.reading { padding: 20px; min-width: 0; }
.reading h2 { color: #69716b; font-size: .85rem; font-weight: 500; }
.reading p { display: flex; align-items: baseline; gap: 8px; margin: 14px 0 0; }
.reading strong { font-size: clamp(1.7rem, 4vw, 2.65rem); font-weight: 550; letter-spacing: -.05em; font-variant-numeric: tabular-nums; }
.reading p span { color: #69716b; font-size: .9rem; }
.battery-reading strong { color: var(--battery-color); }
#soc-meter { display: block; width: 100%; height: 5px; margin-top: 12px; border: 0; border-radius: 4px; background: #edf0ed; accent-color: var(--battery-color); overflow: hidden; }
#soc-meter::-webkit-progress-bar { background: #edf0ed; }
#soc-meter::-webkit-progress-value { background: var(--battery-color); }
#soc-meter::-moz-progress-bar { background: var(--battery-color); }
.meta { margin: 12px 0 14px; font-size: .78rem; color: #69716b; flex-wrap: wrap; gap: 6px 16px; }
.battery-curve { margin: 0 0 30px; font-size: .78rem; color: #69716b; line-height: 1.7; }
.battery-curve summary { cursor: pointer; width: fit-content; }
.battery-curve p { max-width: 700px; margin: 10px 0; }
.battery-curve a { color: #315f47; }
.curve-reference { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.curve-reference span { border-left: 3px solid; padding-left: 8px; font-variant-numeric: tabular-nums; }
.ranges { display: flex; gap: 4px; border: 1px solid #dce1dd; border-radius: 7px; padding: 3px; background: white; }
button { font: inherit; cursor: pointer; border: 0; border-radius: 4px; padding: 7px 13px; font-size: .8rem; color: #59615c; background: transparent; }
button:hover { background: #edf1ee; }
button[aria-pressed="true"] { background: #273c30; color: white; }
button:focus-visible { outline: 2px solid #358155; outline-offset: 3px; }
.subtle { color: #69716b; font-size: .8rem; margin: 10px 0 18px; }
.chart { padding: 18px 20px 10px; margin-bottom: 14px; position: relative; }
.chart-top { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 8px; }
.chart-top span { font-size: .75rem; color: #69716b; }
canvas { display: block; width: 100%; height: 195px; margin-top: 12px; touch-action: pan-y; }
.chart-summary { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 3px 0 0; color: #69716b; font-size: .73rem; }
.chart-summary div { display: flex; gap: 5px; }
.chart-summary dt, .chart-summary dd { margin: 0; }
.chart-summary dd { color: #333e36; font-variant-numeric: tabular-nums; }
.tooltip { position: absolute; z-index: 2; pointer-events: none; background: #24382e; color: white; border-radius: 6px; padding: 9px 11px; font-size: .75rem; line-height: 1.6; max-width: calc(100% - 24px); box-shadow: 0 3px 12px #0002; }
footer { margin-top: 25px; align-items: flex-start; flex-wrap: wrap; font-size: .72rem; line-height: 1.7; color: #747d76; }
.error { background: #f8e9e5; color: #853c2b; padding: 12px; border-radius: 7px; font-size: .85rem; }
[hidden] { display: none !important; }
@media (max-width: 760px) { .readings { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) {
  main { padding: 24px 14px; }
  h1 { font-size: 1.4rem; }
  .readings { grid-template-columns: repeat(2, 1fr); gap: 8px; margin-top: 22px; }
  .reading { padding: 14px 10px; }
  .reading p { flex-wrap: wrap; gap: 1px 5px; }
  .reading strong { font-size: 1.7rem; }
  .reading p span { font-size: .75rem; }
  .chart { padding: 16px 12px 10px; }
  button { padding: 7px 10px; }
  canvas { height: 180px; }
}
@media (max-width: 360px) { .reading strong { font-size: 1.4rem; } .history-heading { align-items: flex-start; flex-direction: column; gap: 10px; } }