:root {
  --bg: #f2f2f7; --card: #fff; --card2: #fff; --line: #e3e3e8;
  --fg: #000; --fg2: #6c6c70; --fg3: #a1a1a6;
  --accent: #007aff; --good: #30a14e; --warn: #ff9f0a; --bad: #ff453a;
  --radius: 14px;
  --safe-b: env(safe-area-inset-bottom, 0px);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000; --card: #1c1c1e; --card2: #2c2c2e; --line: #38383a;
    --fg: #fff; --fg2: #98989f; --fg3: #6c6c70;
    --accent: #0a84ff; --good: #32d74b; --warn: #ffd60a; --bad: #ff453a;
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--fg);
  font: 15px/1.45 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  padding-bottom: calc(58px + var(--safe-b));
}
a { color: var(--accent); text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

/* ---------------------------------------------------------------- layout */
main { max-width: 780px; margin: 0 auto; padding: 0 16px 32px; }
header.top {
  max-width: 780px; margin: 0 auto; padding: 22px 16px 6px;
}
header.top h1 { margin: 0; font-size: 30px; font-weight: 700; letter-spacing: -0.4px; }
header.top .sub { color: var(--fg2); font-size: 14px; margin-top: 2px; }

section { margin-top: 22px; }
h2 {
  margin: 0 0 8px; font-size: 13px; font-weight: 600; letter-spacing: 0.4px;
  text-transform: uppercase; color: var(--fg2); padding-left: 4px;
}

.card {
  background: var(--card); border-radius: var(--radius);
  padding: 14px 16px; margin-bottom: 10px;
}
.grid { display: grid; gap: 10px; grid-template-columns: repeat(2, 1fr); }
.grid > .card { margin-bottom: 0; }
/* Three across even on a phone — he asked for dense once you're in the detail. */
.grid.g3 { grid-template-columns: repeat(3, 1fr); gap: 8px; }
.grid.g3 > .card { padding: 11px 12px; }
.grid.g3 .value { font-size: 21px; letter-spacing: -0.4px; }
.grid.g3 .value .unit { font-size: 11px; margin-left: 1px; }
.grid.g3 .label { font-size: 11px; }

/* ------------------------------------------------------------- stat cards */
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat .label { font-size: 12px; color: var(--fg2); font-weight: 500; }
.stat .value { font-size: 27px; font-weight: 600; letter-spacing: -0.6px; line-height: 1.15; }
.stat .value .unit { font-size: 14px; font-weight: 500; color: var(--fg2); margin-left: 2px; }
.stat .note { font-size: 12px; color: var(--fg2); }
.stat.wide .value { font-size: 34px; }

.z { font-weight: 600; }
.z.up { color: var(--good); } .z.down { color: var(--bad); } .z.flat { color: var(--fg2); }
.chip {
  display: inline-block; font-size: 11px; font-weight: 600; padding: 2px 7px;
  border-radius: 999px; background: var(--card2); color: var(--fg2);
  border: 1px solid var(--line);
}
@media (prefers-color-scheme: dark) { .chip { border-color: transparent; } }
.src { font-size: 11px; color: var(--fg3); }

/* ------------------------------------------------------------- disclosure */
details.more { margin-top: 10px; border-top: 1px solid var(--line); padding-top: 8px; }
details.more > summary {
  list-style: none; cursor: pointer; font-size: 12px; color: var(--accent);
  font-weight: 500;
}
details.more > summary::-webkit-details-marker { display: none; }
details.more > summary::after { content: " ›"; }
details.more[open] > summary::after { content: " ⌄"; }

/* ------------------------------------------------------------------ table */
table.data { width: 100%; border-collapse: collapse; font-size: 12.5px; font-variant-numeric: tabular-nums; }
table.data th {
  text-align: left; font-weight: 600; color: var(--fg2); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.3px; padding: 6px 8px 6px 0;
  border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--card);
}
table.data td { padding: 5px 8px 5px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data tr:last-child td { border-bottom: 0; }
table.data td.num, table.data th.num {
  text-align: right; padding-right: 0; padding-left: 12px; white-space: nowrap;
}
.scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 11.5px; }

/* ------------------------------------------------------------------- list */
.row {
  display: flex; align-items: center; gap: 12px; padding: 11px 16px;
  background: var(--card); border-bottom: 1px solid var(--line);
  color: var(--fg);
}
.row:first-child { border-radius: var(--radius) var(--radius) 0 0; }
.row:last-child { border-bottom: 0; border-radius: 0 0 var(--radius) var(--radius); }
.row:only-child { border-radius: var(--radius); }
.row .ico { font-size: 21px; width: 28px; text-align: center; flex: none; }
.row .mid { flex: 1; min-width: 0; }
.row .t1, .row .t2 { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.row .t1 { font-weight: 600; font-size: 15px; }
.row .t2 { font-size: 12.5px; color: var(--fg2); }
.row .end { flex: none; text-align: right; font-size: 12.5px; color: var(--fg2); font-variant-numeric: tabular-nums; }
.row .end b { display: block; color: var(--fg); font-size: 15px; font-weight: 600; }

/* ------------------------------------------------------------------ coach */
.coach {
  background: linear-gradient(180deg, var(--card), var(--card));
  border-left: 3px solid var(--accent); border-radius: 6px var(--radius) var(--radius) 6px;
}
.coach .who { font-size: 11px; font-weight: 700; letter-spacing: 1px; color: var(--accent); }
.coach p { margin: 6px 0 0; font-size: 15px; line-height: 1.5; white-space: pre-wrap; }

/* ------------------------------------------------------------------ zones */
.zbar { display: flex; height: 26px; border-radius: 6px; overflow: hidden; margin: 6px 0 4px; }
.zbar div { min-width: 0; }
.zlegend { display: flex; gap: 10px; flex-wrap: wrap; font-size: 11.5px; color: var(--fg2); }
.zlegend i { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 4px; }

/* ------------------------------------------------------------------- tabs */
nav.tabs {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 20;
  display: flex; justify-content: space-around;
  padding-bottom: var(--safe-b);
  background: color-mix(in srgb, var(--card) 82%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-top: 1px solid var(--line);
}
nav.tabs a {
  flex: 1; text-align: center; padding: 7px 0 6px; color: var(--fg3);
  font-size: 10px; font-weight: 500; letter-spacing: 0.2px;
}
nav.tabs a .g { display: block; font-size: 20px; line-height: 1.25; }
nav.tabs a.on { color: var(--accent); }

/* ------------------------------------------------------------------ misc */
.controls { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
.controls button, .controls select {
  background: var(--card); border: 1px solid var(--line); color: var(--fg);
  padding: 6px 11px; border-radius: 999px; font-size: 13px;
}
.controls button.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.controls select { border-radius: 10px; flex-basis: 100%; }
.muted { color: var(--fg2); }
.tiny { font-size: 11.5px; }
.center { text-align: center; }
.spinner { padding: 40px 0; text-align: center; color: var(--fg3); }
.err { color: var(--bad); }
.chart { width: 100%; }
.delta { font-size: 12.5px; font-weight: 600; }

/* ------------------------------------------------------------------ login */
.login { max-width: 320px; margin: 22vh auto; text-align: center; padding: 0 16px; }
.login h1 { font-size: 22px; margin: 0 0 4px; }
.login input {
  width: 100%; padding: 12px 14px; font-size: 16px; margin: 16px 0 10px;
  border-radius: 12px; border: 1px solid var(--line); background: var(--card); color: var(--fg);
}
.login button {
  width: 100%; padding: 12px; border-radius: 12px; background: var(--accent);
  color: #fff; font-weight: 600; font-size: 16px;
}

/* uPlot theming */
.u-legend { font-size: 11.5px; color: var(--fg2); }
.u-legend .u-marker { width: 9px; height: 9px; }
.u-title { font-size: 12px; color: var(--fg2); }