/* Still here: one accent, white cards on soft gray, follows system light/dark. */
:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --soft: #f2f2f7;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --line: #e8e8ed;
  --accent: #007aff;
  --dot: #8999aa;
  --dot-strong: #526a86;
  --day-on: #83b6f3;
  --shadow: 0 1px 4px #00000012;
  --radius: 24px;
  --rounded: ui-rounded, 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1c1c1e;
    --soft: #2c2c2e;
    --ink: #f5f5f7;
    --muted: #a1a1aa;
    --line: #343438;
    --accent: #0a84ff;
    --dot: #8e9bab;
    --dot-strong: #b9c6d6;
    --day-on: #3f7fcf;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.4 -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3, p { margin: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.caption { font-size: 12px; color: var(--muted); }
.link { border: 0; background: none; padding: 0; color: var(--accent); font-size: 13px; text-decoration: none; cursor: pointer; }

/* ---------- header ---------- */
.top {
  max-width: 1040px; margin: 0 auto;
  padding: max(18px, env(safe-area-inset-top)) 32px 0;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.brand { color: var(--ink); text-decoration: none; font-weight: 700; font-size: 22px; letter-spacing: -0.8px; white-space: nowrap; }
.segmented { display: flex; gap: 2px; padding: 3px; background: var(--soft); border-radius: 10px; }
.segmented button {
  border: 0; background: transparent; color: var(--muted);
  padding: 6px 16px; border-radius: 7px; font-size: 13px; font-weight: 600;
}
.segmented button[aria-current], .segmented button[aria-pressed='true'] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }

/* ---------- layout ---------- */
main { max-width: 1040px; margin: 0 auto; padding: 36px 32px 0; }
.intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 26px; }
h1 { font-size: 42px; line-height: 1.1; letter-spacing: -1.8px; font-weight: 700; margin-bottom: 8px; }
#encouragement { color: var(--muted); font-size: 16px; }
.updated { text-align: right; font-size: 12px; color: var(--muted); }
.updated span, .updated strong { display: block; }
.updated strong { color: var(--ink); font-weight: 500; margin-top: 4px; }

.card { background: var(--surface); border-radius: var(--radius); padding: 28px 32px; margin-bottom: 20px; }
h2 { font-size: 20px; letter-spacing: -0.4px; font-weight: 600; }
h2.spaced { margin-top: 30px; }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 18px; }
select, input[type='date'] { border: 0; background: var(--soft); border-radius: 8px; padding: 8px 10px; font-size: 13px; }

body[data-view='overview'] .view-history,
body[data-view='history'] .view-overview { display: none; }

/* ---------- weights ---------- */
.trend-card { padding-top: 32px; }
.weights { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 24px; align-items: center; margin-bottom: 28px; }
.weight h2 { font-size: 15px; color: var(--muted); letter-spacing: -0.2px; }
.weight.latest { border-left: 1px solid var(--line); padding-left: 24px; }
.hero { display: flex; align-items: baseline; gap: 6px; margin: 6px 0 6px; font-family: var(--rounded); }
.hero > span:first-child { font-weight: 600; font-size: clamp(52px, 9vw, 78px); line-height: 1.05; letter-spacing: -3px; }
.trend .hero { color: var(--accent); }
.latest .hero > span:first-child { font-size: clamp(30px, 5vw, 44px); letter-spacing: -1.4px; }
.unit { font-size: 18px; color: var(--muted); font-weight: 500; }

/* ---------- chart ---------- */
.chart-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; }
.ranges button { padding: 6px 18px; font-size: 12px; }
#chart-wrap { position: relative; margin-top: 16px; min-height: 300px; }
#chart { display: block; width: 100%; touch-action: pan-y; }
#chart text { font-size: 11px; fill: var(--muted); }
#chart .grid { stroke: var(--line); }
#chart .gap { fill: var(--muted); opacity: 0.07; }
#chart .band { fill: var(--accent); opacity: 0.09; }
#chart .trend-line { fill: none; stroke: var(--accent); stroke-width: 2.8; stroke-linecap: round; stroke-linejoin: round; }
#chart .range-bar { stroke: var(--dot); stroke-width: 3; stroke-linecap: round; opacity: 0.65; }
#chart .dot { stroke-width: 1.3; opacity: 0.9; }
#chart .dot.health { fill: var(--dot); stroke: var(--dot); }
#chart .dot.journal { fill: var(--surface); stroke: var(--dot); }
#chart .dot.outside { stroke: var(--dot-strong); stroke-width: 2; }
#chart .dot.excluded { opacity: 0.3; }
#tooltip {
  position: absolute; top: 8px; pointer-events: none; z-index: 2;
  display: grid; gap: 2px; min-width: 140px;
  background: #1d1d1ff2; color: #fff; border-radius: 12px; padding: 10px 14px; font-size: 13px;
}
#tooltip span { color: #c9ccd1; font-size: 12px; }
#tooltip[hidden] { display: none; }
body[data-view='history'] #encouragement { display: none; }
.legend { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 6px; font-size: 11px; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend [hidden] { display: none; }
.key-line { width: 16px; height: 2.5px; border-radius: 2px; background: var(--accent); }
.key-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--dot); border: 1px solid var(--dot); }
.key-dot.hollow { background: var(--surface); }
.key-band { width: 14px; height: 9px; border-radius: 2px; background: var(--accent); opacity: 0.18; }

.highlight { border-top: 1px solid var(--line); margin-top: 22px; padding-top: 20px; }
.highlight h2 { font-size: 12px; font-weight: 500; color: var(--muted); letter-spacing: 0; }
.highlight .insight { font-size: 19px; letter-spacing: -0.3px; margin: 6px 0 6px; }

/* ---------- calendar ---------- */
/* Cell size is set from JS (--cell) so labels, months and days stay aligned. */
.calendar { --cell: 16px; display: flex; gap: 6px; }
.weekdays {
  flex: none; width: 26px; display: grid; row-gap: 4px;
  grid-template-rows: repeat(7, var(--cell)); padding-top: 22px;
  font-size: 9px; color: var(--muted); align-items: center;
}
.calendar-scroll { flex: 1; min-width: 0; overflow-x: auto; padding: 0 2px 6px; scrollbar-width: thin; }
.months, .days { display: grid; column-gap: 4px; grid-template-columns: repeat(var(--weeks), var(--cell)); width: max-content; }
.months { height: 16px; margin-bottom: 6px; font-size: 10px; line-height: 16px; color: var(--muted); white-space: nowrap; }
.days { grid-auto-flow: column; grid-template-rows: repeat(7, var(--cell)); row-gap: 4px; }
.day { width: var(--cell); height: var(--cell); border: 0; padding: 0; border-radius: 3px; background: var(--soft); }
.day.on { background: var(--day-on); }
.day.blank { visibility: hidden; }
.day.today { box-shadow: inset 0 0 0 1.5px var(--accent); }
.day.selected { outline: 2px solid var(--accent); outline-offset: 1px; }
.calendar-foot { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; margin-top: 12px; font-size: 11px; }
.calendar-key { display: inline-flex; align-items: center; gap: 6px; }
.calendar-key i { width: 9px; height: 9px; border-radius: 2px; background: var(--soft); display: inline-block; }
.calendar-key i.on { background: var(--day-on); margin-left: 8px; }

/* ---------- history ---------- */
.stats { display: flex; flex-wrap: wrap; gap: 18px 40px; margin: 18px 0 22px; }
.stats span { display: block; font-size: 12px; color: var(--muted); }
.stats strong { display: block; font-family: var(--rounded); font-size: 26px; font-weight: 600; letter-spacing: -0.6px; margin-top: 4px; }
.explore { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; border-top: 1px solid var(--line); padding-top: 18px; font-size: 13px; }
.explore label { color: var(--muted); }
.history-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.history-grid .card { margin-bottom: 20px; }
.list { margin-top: 6px; }
.row {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; width: 100%;
  padding: 14px 0; border: 0; border-bottom: 1px solid var(--line); background: none; text-align: left;
}
.row:last-child { border-bottom: 0; }
.row small { display: block; font-size: 11px; color: var(--muted); margin-top: 3px; }
.row strong { font-size: 17px; font-weight: 600; white-space: nowrap; }
.row strong small { display: inline; font-size: 12px; font-weight: 500; }
.list.compact .row { padding: 10px 0; }
.list.compact .row strong { font-size: 15px; }
#flags-note { margin-top: 6px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th { text-align: left; color: var(--muted); font-weight: 500; font-size: 12px; padding: 8px 0; }
td { padding: 12px 0; border-top: 1px solid var(--line); }
td:last-child { text-align: right; }
.chip { border: 0; background: var(--soft); color: var(--accent); border-radius: 6px; padding: 5px 10px; font-size: 12px; }

.method { margin: 6px 3px 0; font-size: 12px; color: var(--muted); }
.method summary { cursor: pointer; width: fit-content; }
.method-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; padding-top: 14px; }
.method h3 { font-size: 13px; color: var(--ink); font-weight: 600; margin-bottom: 6px; }
.method p { line-height: 1.6; }
.method a { color: var(--accent); }

footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; padding: 26px 3px max(30px, env(safe-area-inset-bottom)); font-size: 11px; color: var(--muted); }
#error { max-width: 420px; margin: 40px auto; text-align: center; }

/* ---------- inspector ---------- */
dialog {
  width: min(440px, calc(100% - 32px)); max-height: 90vh; overflow: auto;
  border: 1px solid var(--line); border-radius: 22px; padding: 26px; background: var(--surface); color: var(--ink);
}
dialog::backdrop { background: #0006; }
dialog .close { float: right; width: 32px; height: 32px; border: 0; border-radius: 50%; background: var(--soft); font-size: 22px; line-height: 1; }
.inspect-value { font-family: var(--rounded); font-size: 34px; font-weight: 600; margin: 12px 0 16px; }
dialog dl { display: grid; grid-template-columns: 70px 1fr; gap: 10px; font-size: 13px; margin: 0 0 14px; }
dialog dt { color: var(--muted); }
dialog dd { margin: 0; }
#inspect-note:empty { display: none; }
#inspect-note { margin-bottom: 14px; font-size: 13px; }

/* ---------- small screens ---------- */
@media (max-width: 700px) {
  .top { padding-left: 18px; padding-right: 18px; }
  main { padding: 26px 16px 0; }
  h1 { font-size: 34px; }
  #encouragement { font-size: 14px; }
  .card { padding: 24px 20px; border-radius: 22px; }
  .weights { gap: 14px; }
  .weight.latest { padding-left: 14px; }
  .weight h2 { font-size: 12px; }
  .unit { font-size: 14px; }
  .chart-toolbar { flex-direction: column; align-items: stretch; gap: 10px; }
  .ranges button { flex: 1; }
  .history-grid { grid-template-columns: 1fr; gap: 0; }
  .method-grid { grid-template-columns: 1fr; gap: 8px; }
}
@media (max-width: 400px) {
  .intro .updated { display: none; }
  .segmented button { padding: 6px 12px; }
  .hero > span:first-child { font-size: 48px; letter-spacing: -2px; }
  .latest .hero > span:first-child { font-size: 28px; }
  .highlight .insight { font-size: 17px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }