:root {
  color-scheme: light;
  --bg: #f4f3f0;
  --surface: #fcfcfb;
  --surface-2: #f0efec;
  --border: #e3e2dd;
  --grid: #e8e7e3;
  --text: #0b0b0b;
  --text-2: #52514e;
  --text-3: #7a7974;
  --accent: #2a78d6;

  --s1: #2a78d6; /* blue    */
  --s2: #eb6834; /* orange  */
  --s3: #1baf7a; /* aqua    */
  --s4: #eda100; /* yellow  */
  --s5: #e87ba4; /* magenta */
  --s6: #008300; /* green   */
  --s7: #6250d6; /* violet  */

  --pos: #2a78d6;
  --neg: #e34948;
  --neutral: #c9c8c2;

  --good: #0ca30c;
  --warning: #fab219;
  --serious: #ec835a;
  --critical: #d03b3b;

  --heat-0: #f0efec;
  --heat-1: #b7d3f6;
  --heat-2: #6da7ec;
  --heat-3: #2a78d6;
  --heat-4: #184f95;

  --z1: #86b6ef;
  --z2: #5598e7;
  --z3: #2a78d6;
  --z4: #1c5cab;
  --z5: #104281;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121211;
    --surface: #1a1a19;
    --surface-2: #232321;
    --border: #2e2e2b;
    --grid: #2a2a28;
    --text: #f0efec;
    --text-2: #c3c2b7;
    --text-3: #8f8e86;
    --accent: #3987e5;
    --s1: #3987e5;
    --s2: #d95926;
    --s3: #199e70;
    --s4: #c98500;
    --s5: #d55181;
    --s6: #008300;
    --s7: #9085e9;
    --pos: #3987e5;
    --neg: #e66767;
    --neutral: #4a4a46;
    --heat-0: #232321;
    --heat-1: #184f95;
    --heat-2: #256abf;
    --heat-3: #3987e5;
    --heat-4: #86b6ef;
    --z1: #184f95;
    --z2: #256abf;
    --z3: #3987e5;
    --z4: #6da7ec;
    --z5: #9ec5f4;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121211;
  --surface: #1a1a19;
  --surface-2: #232321;
  --border: #2e2e2b;
  --grid: #2a2a28;
  --text: #f0efec;
  --text-2: #c3c2b7;
  --text-3: #8f8e86;
  --accent: #3987e5;
  --s1: #3987e5;
  --s2: #d95926;
  --s3: #199e70;
  --s4: #c98500;
  --s5: #d55181;
  --s6: #008300;
  --s7: #9085e9;
  --pos: #3987e5;
  --neg: #e66767;
  --neutral: #4a4a46;
  --heat-0: #232321;
  --heat-1: #184f95;
  --heat-2: #256abf;
  --heat-3: #3987e5;
  --heat-4: #86b6ef;
  --z1: #184f95;
  --z2: #256abf;
  --z3: #3987e5;
  --z4: #6da7ec;
  --z5: #9ec5f4;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-variant-numeric: tabular-nums;
}

header {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 8px;
  max-width: 1400px;
  margin: 0 auto;
}

h1 { font-size: 20px; margin: 0; letter-spacing: -0.01em; }
h1 small { font-weight: 400; color: var(--text-3); font-size: 13px; margin-left: 8px; }
h2 { font-size: 14px; margin: 0; font-weight: 600; }
.sub { color: var(--text-3); font-size: 12px; margin: 2px 0 0; }

.controls { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

.seg {
  display: inline-flex;
  background: var(--surface-2);
  border-radius: 8px;
  padding: 2px;
}
.seg button {
  border: 0;
  background: transparent;
  color: var(--text-2);
  font: inherit;
  font-size: 13px;
  padding: 5px 11px;
  border-radius: 6px;
  cursor: pointer;
}
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--text); box-shadow: 0 1px 2px #0000001a; }

.btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
}
.btn:disabled { opacity: 0.55; cursor: progress; }
.status { color: var(--text-3); font-size: 12px; }

main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 8px 24px 40px;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  min-width: 0;
}
.card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 12px; }

.span-12 { grid-column: span 12; }
.span-8 { grid-column: span 8; }
.span-6 { grid-column: span 6; }
.span-4 { grid-column: span 4; }

@media (max-width: 1000px) {
  .span-8, .span-6, .span-4 { grid-column: span 12; }
}
@media (max-width: 640px) {
  header, main { padding-left: 16px; padding-right: 16px; }
}

/* KPI tiles */
.kpis {
  grid-column: span 12;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  grid-auto-flow: dense;
  gap: 16px;
}
.kpi .label { color: var(--text-2); font-size: 12px; }
.kpi .value { font-size: 28px; font-weight: 600; letter-spacing: -0.02em; line-height: 1.15; margin-top: 4px; }
.kpi .value small { font-size: 14px; font-weight: 500; color: var(--text-2); margin-left: 3px; }
.kpi .note { color: var(--text-3); font-size: 12px; margin-top: 4px; }
.kpi.hero { grid-row: span 2; grid-column: span 2; display: flex; flex-direction: column; }
@media (max-width: 640px) {
  .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .kpi.hero { grid-column: span 2; grid-row: span 1; }
  .kpi .value { font-size: 24px; }
}
.kpi.hero .value { font-size: 48px; }

.gauge { height: 6px; background: var(--surface-2); border-radius: 3px; margin: 10px 0 8px; overflow: hidden; }
.gauge > span { display: block; height: 100%; border-radius: 3px; background: var(--accent); }

.drivers { list-style: none; padding: 0; margin: 8px 0 0; display: grid; gap: 6px; font-size: 12px; }
.drivers li { display: grid; grid-template-columns: 92px 1fr 34px; align-items: center; gap: 8px; color: var(--text-2); }
.drivers .bar { position: relative; height: 6px; background: var(--surface-2); border-radius: 3px; }
.drivers .bar::after { content: ""; position: absolute; left: 50%; top: -2px; bottom: -2px; width: 1px; background: var(--text-3); }
.drivers .bar span { position: absolute; top: 0; bottom: 0; border-radius: 3px; }
.drivers .z { text-align: right; color: var(--text-3); }

/* Alerts */
.alerts { display: grid; gap: 8px; }
.alert { display: grid; grid-template-columns: 22px 1fr; gap: 10px; padding: 10px 12px; border-radius: 8px; background: var(--surface-2); }
.alert .icon { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-size: 12px; font-weight: 700; color: #fff; }
.alert .title { font-weight: 600; }
.alert .detail { color: var(--text-2); font-size: 13px; }
.alert.good .icon { background: var(--good); }
.alert.info .icon { background: var(--text-3); }
.alert.warning .icon { background: var(--warning); color: #0b0b0b; }
.alert.serious .icon { background: var(--critical); }
.empty { color: var(--text-3); font-size: 13px; padding: 8px 0; }

/* Charts */
.chart { position: relative; width: 100%; }
.chart svg { display: block; width: 100%; overflow: visible; }
.chart .grid line { stroke: var(--grid); stroke-width: 1; }
.chart .axis text { fill: var(--text-3); font-size: 11px; }
.chart .baseline { stroke: var(--text-3); stroke-width: 1; }
.chart .hover-line { stroke: var(--text-3); stroke-width: 1; }

.legend { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 12px; color: var(--text-2); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.legend i.line { height: 2px; border-radius: 1px; width: 14px; }
.legend i.dot { width: 7px; height: 7px; border-radius: 50%; }
.legend i.dash { height: 0; width: 14px; border-top: 2px dashed var(--text-3); border-radius: 0; background: none !important; }

#tooltip {
  position: fixed;
  pointer-events: none;
  z-index: 10;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 12px;
  box-shadow: 0 4px 16px #00000026;
  min-width: 140px;
  opacity: 0;
  transition: opacity 80ms;
}
#tooltip .t-head { font-weight: 600; margin-bottom: 4px; }
#tooltip .t-row { display: flex; align-items: center; gap: 6px; justify-content: space-between; }
#tooltip .t-row span:first-child { display: inline-flex; align-items: center; gap: 6px; color: var(--text-2); }
#tooltip i { width: 8px; height: 8px; border-radius: 2px; display: inline-block; }

/* Calendar heatmap */
.heatmap { overflow-x: auto; }
.heatmap svg { display: block; }
.heatmap rect.cell { rx: 2px; }
.heat-legend { display: flex; align-items: center; gap: 4px; font-size: 11px; color: var(--text-3); margin-top: 8px; }
.heat-legend i { width: 10px; height: 10px; border-radius: 2px; display: inline-block; }

/* Tables */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th { text-align: left; color: var(--text-3); font-weight: 500; font-size: 12px; padding: 6px 8px; border-bottom: 1px solid var(--border); white-space: nowrap; }
td { padding: 7px 8px; border-bottom: 1px solid var(--grid); }
td.num, th.num { text-align: right; }
tr:last-child td { border-bottom: 0; }
.table-wrap { overflow-x: auto; }
.pill { display: inline-block; font-size: 11px; padding: 1px 7px; border-radius: 10px; background: var(--surface-2); color: var(--text-2); white-space: nowrap; }
.pill.new { background: var(--good); color: #fff; }
.sport-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; }

.error-banner { grid-column: span 12; background: var(--surface); border: 1px solid var(--critical); border-radius: 12px; padding: 12px 16px; }

/* Navigation */
#nav { display: flex; gap: 2px; flex-wrap: wrap; order: 3; width: 100%; border-bottom: 1px solid var(--border); }
#nav a {
  color: var(--text-2);
  text-decoration: none;
  padding: 8px 12px;
  font-size: 14px;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
#nav a:hover { color: var(--text); }
#nav a[aria-current="true"] { color: var(--text); border-bottom-color: var(--accent); font-weight: 600; }
.controls { order: 2; }

main.view[hidden] { display: none; }
.loading { grid-column: span 12; color: var(--text-3); padding: 40px 0; text-align: center; }
.link { color: inherit; text-decoration: none; border-bottom: 1px dotted var(--text-3); }
.link:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* Running */
.predictions { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; }
.prediction { background: var(--surface-2); border-radius: 10px; padding: 12px 14px; }
.prediction .label { color: var(--text-2); font-size: 12px; }
.prediction .value { font-size: 26px; font-weight: 600; letter-spacing: -0.02em; margin: 2px 0; }
.prediction .note { color: var(--text-3); font-size: 12px; }

/* Bar lists (zones, groups, weekdays) */
.barlist { display: grid; gap: 8px; }
.bl-row { display: grid; grid-template-columns: minmax(90px, 150px) 1fr minmax(70px, auto); gap: 10px; align-items: center; font-size: 13px; }
.bl-label { color: var(--text-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bl-track { position: relative; height: 12px; background: var(--surface-2); border-radius: 4px; }
.bl-track span { position: absolute; top: 0; bottom: 0; border-radius: 4px; min-width: 2px; }
.barlist.diverging .bl-track::after { content: ""; position: absolute; left: 50%; top: -3px; bottom: -3px; width: 1px; background: var(--text-3); }
.bl-value { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.bl-value small { color: var(--text-3); margin-left: 6px; }

/* Insights */
.intro h2 { font-size: 16px; }
.finding { font-size: 15px; margin: 0 0 12px; line-height: 1.45; }
.pill.strength-strong { background: var(--accent); color: #fff; }
.pill.strength-moderate { background: color-mix(in srgb, var(--accent) 25%, var(--surface-2)); color: var(--text); }
.pill.strength-insufficient { color: var(--text-3); }
.scatter .axis text { fill: var(--text-3); font-size: 11px; }

/* Compare */
.compare-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
table.compare td:first-child { width: 40%; }
.delta { color: var(--text-2); white-space: nowrap; }
.delta b { font-size: 10px; }
.delta.good b { color: var(--good); }
.delta.bad b { color: var(--critical); }

/* Activity detail */
.activity-head { grid-column: span 12; }
.activity-title { font-size: 22px; margin: 6px 0 2px; display: flex; align-items: center; }
.activity-title .sport-dot { width: 12px; height: 12px; margin-right: 10px; }
.back { font-size: 13px; color: var(--text-2); }
.map { height: 360px; border-radius: 8px; overflow: hidden; background: var(--surface-2); }
tr.best td { background: var(--surface-2); }
.leaflet-container { font: inherit; }

/* Login page ---------------------------------------------------------------- */
main.login {
  grid-template-columns: minmax(0, 360px);
  justify-content: center;
  align-content: center;
  min-height: 100vh;
  padding: 24px 16px;
}
.login-card {
  display: grid;
  gap: 14px;
  padding: 28px 24px;
}
.login-card .sub { font-size: 13px; margin-top: -8px; }
.login-card .btn { width: 100%; padding: 9px 12px; text-align: center; text-decoration: none; display: block; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn-primary:hover { filter: brightness(1.08); }
.login-form { display: grid; gap: 8px; }
.login-form label { font-size: 12px; color: var(--text-2); }
.login-form input {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text);
}
.login-form input:focus-visible, .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.login-error {
  margin: 0;
  padding: 8px 10px;
  border-radius: 8px;
  border-left: 3px solid var(--critical);
  background: var(--surface-2);
  font-size: 13px;
}
.login-or { display: flex; align-items: center; gap: 10px; color: var(--text-3); font-size: 12px; }
.login-or::before, .login-or::after { content: ""; flex: 1; border-top: 1px solid var(--border); }
.user { color: var(--text-3); font-size: 12px; }
.logout-form { display: contents; }
.user:empty { display: none; }

/* AI write-ups */
.ai { display: grid; gap: 10px; }
.ai-text { font-size: 14px; line-height: 1.55; max-width: 80ch; }
.ai-text p { margin: 0 0 8px; }
.ai-text ul { margin: 0 0 8px; padding-left: 20px; }
.ai-text li { margin: 2px 0; }
.ai-busy { color: var(--text-3); margin: 0; }
.ai-error { margin: 0; padding: 8px 10px; border-left: 3px solid var(--critical); background: var(--surface-2); border-radius: 8px; }
.ai-foot { display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap; }

/* Goals */
.goal-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.goal { display: grid; gap: 6px; }
.goal-head { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; }
.goal-value { color: var(--text-2); }
.goal-value strong { color: var(--text); }
.goal .done { color: var(--good); font-weight: 700; }
.goal-weeks { display: flex; gap: 3px; align-items: center; font-size: 11px; color: var(--text-3); }
.goal-weeks i { width: 10px; height: 10px; border-radius: 2px; background: var(--surface-2); border: 1px solid var(--border); }
.goal-weeks i.hit { background: var(--accent); border-color: var(--accent); }
.goal-weeks span { margin-left: 6px; }
.race-goal { padding-top: 10px; border-top: 1px solid var(--border); }
.goal-editor { display: grid; gap: 10px; }
.goal-edit-rows { display: grid; gap: 8px; }
.goal-edit-row { display: grid; grid-template-columns: 1.2fr 1.2fr 0.8fr auto; gap: 6px; align-items: center; }
.race-row { grid-template-columns: auto 1.2fr 1fr; padding-top: 8px; border-top: 1px solid var(--border); font-size: 13px; color: var(--text-2); }
.goal-editor select, .goal-editor input, .note-form input, .note-form textarea, .ask-form textarea {
  font: inherit; font-size: 13px; padding: 6px 8px; min-width: 0;
  border: 1px solid var(--border); border-radius: 8px; background: var(--surface-2); color: var(--text);
}
.btn.icon { padding: 4px 10px; }
#goal-error:empty { display: none; }

/* Day notes */
.note-form { display: grid; gap: 8px; }
.note-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.note-row label { font-size: 12px; color: var(--text-2); }
.note-form textarea, .ask-form textarea { resize: vertical; width: 100%; }
.tag-chips, .suggestions { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  font: inherit; font-size: 12px; padding: 4px 10px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface); color: var(--text-2);
}
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip:focus-visible, .note-item:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.note-list { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 2px; }
.note-item {
  font: inherit; font-size: 13px; text-align: left; width: 100%; cursor: pointer;
  background: none; border: 0; padding: 4px 0; color: var(--text-2);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.note-item:hover { color: var(--text); }
.note-date { color: var(--text); font-weight: 600; margin-right: 6px; }

/* Ask */
.ask { display: grid; gap: 12px; }
.messages { display: grid; gap: 10px; max-height: 60vh; overflow-y: auto; }
.msg { max-width: 85ch; padding: 10px 12px; border-radius: 12px; }
.msg.user { justify-self: end; background: var(--accent); color: #fff; white-space: pre-wrap; }
.msg.assistant { justify-self: start; background: var(--surface-2); }
.msg .ai-text p:last-child, .msg .ai-text ul:last-child { margin-bottom: 0; }
.queries { margin-top: 8px; font-size: 12px; color: var(--text-3); }
.queries summary { cursor: pointer; }
.queries pre { white-space: pre-wrap; background: var(--surface); padding: 8px; border-radius: 8px; margin: 6px 0 0; font-size: 11px; color: var(--text-2); }
.ask-form { display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: end; }
@media (max-width: 640px) {
  .goal-edit-row { grid-template-columns: 1fr 1fr; }
  .goal-edit-row .btn.icon { justify-self: start; }
  .race-row { grid-template-columns: 1fr 1fr; }
  .race-row label { grid-column: 1 / -1; }
}

/* Weight & body composition */
.body-grid { display: grid; grid-template-columns: minmax(0, 2fr) minmax(200px, 1fr); gap: 20px; align-items: start; }
.body-stats { margin: 0; display: grid; gap: 10px; }
.body-stats div { display: grid; gap: 1px; }
.body-stats dt { font-size: 12px; color: var(--text-3); }
.body-stats dd { margin: 0; font-size: 14px; }
.body-stats strong { font-size: 18px; }
#body-card .ai-foot { margin-top: 12px; }
@media (max-width: 760px) { .body-grid { grid-template-columns: 1fr; } }