:root {
  --ink: #161513;
  --mut: #8a877f;
  --faint: #b6b3ab;
  --line: #e8e6e1;
  --accent: #e14d2e;
  --bg: #fbfbf9;
  --good: #2e7d4f;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}
#app { max-width: 560px; margin: 0 auto; padding: 20px 20px 84px; min-height: 100vh; }
#top {
  display: flex; justify-content: space-between; align-items: baseline;
  padding-bottom: 14px; border-bottom: 1px solid var(--line); margin-bottom: 26px;
}
#who { font-size: 15px; }
#date { color: var(--mut); font-size: 13px; }
.label {
  text-transform: uppercase; letter-spacing: 0.18em;
  font-size: 0.68rem; color: var(--mut);
}
.bignum {
  font-weight: 200; font-size: clamp(3rem, 15vw, 4.6rem);
  letter-spacing: -0.03em; line-height: 1.02; font-variant-numeric: tabular-nums;
}
.bignum.neg { color: var(--accent); }
.hairline { border: 0; border-top: 1px solid var(--line); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.row2 > div:first-child { border-right: 1px solid var(--line); padding-right: 16px; }
.row2 > div:last-child { padding-left: 16px; }
.colnum { font-weight: 300; font-size: 1.7rem; font-variant-numeric: tabular-nums; }
.colsub { color: var(--mut); font-size: 0.78rem; margin-top: 2px; }
section.block { margin: 26px 0; }
.secthead {
  display: flex; justify-content: space-between; align-items: baseline;
  border-bottom: 1px solid var(--line); padding-bottom: 8px; margin-bottom: 4px;
}
ul.rows { list-style: none; }
ul.rows > li {
  display: flex; justify-content: space-between; align-items: baseline; gap: 10px;
  padding: 13px 0; border-bottom: 1px solid var(--line);
}
ul.rows .r-title { flex: 1; min-width: 0; }
ul.rows .r-sub { color: var(--mut); font-size: 0.78rem; margin-top: 1px; }
ul.rows .r-amt { font-variant-numeric: tabular-nums; white-space: nowrap; }
ul.rows .r-status { font-size: 0.72rem; min-width: 64px; text-align: right; }
.status-open { color: var(--accent); }
.status-settled { color: var(--good); }
.status-tab { color: var(--mut); }
.status-neg { color: var(--accent); }
button, .linklike {
  font: inherit; background: none; border: 0; color: var(--ink);
  cursor: pointer; padding: 0;
}
.linklike { text-decoration: underline; text-underline-offset: 3px; }
.linklike.accent { color: var(--accent); }
.linklike.mut { color: var(--mut); }
.actions { display: flex; justify-content: space-between; padding: 22px 0 6px; }
.actions .linklike { font-size: 1rem; }
input, select {
  font: inherit; color: var(--ink); background: transparent;
  border: 0; border-bottom: 1px solid var(--line);
  padding: 8px 0; width: 100%; border-radius: 0;
}
input:focus, select:focus { outline: none; border-bottom-color: var(--ink); }
input[type="number"], input.amount { font-variant-numeric: tabular-nums; }
.field { margin: 18px 0 0; }
.field .label { display: block; margin-bottom: 2px; }
.seg { display: flex; gap: 0; border-bottom: 1px solid var(--line); }
.seg button {
  flex: 1; padding: 10px 4px; color: var(--mut); font-size: 0.82rem;
  text-transform: uppercase; letter-spacing: 0.08em;
}
.seg button.on { color: var(--ink); box-shadow: inset 0 -1px 0 var(--ink); }
.chips { display: flex; gap: 14px; padding: 10px 0; flex-wrap: wrap; }
.chips button { color: var(--mut); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em; }
.chips button.on { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
#nav {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--bg); border-top: 1px solid var(--line);
  display: flex; justify-content: space-around;
  padding: 12px 0 calc(12px + env(safe-area-inset-bottom));
}
#nav button {
  font-size: 0.7rem; letter-spacing: 0.14em; color: var(--faint); padding: 2px 4px;
}
#nav button.on { color: var(--ink); box-shadow: inset 0 -2px 0 var(--accent); }
#sheet {
  position: fixed; inset: 0; background: rgba(20,19,17,0.35);
  display: flex; align-items: flex-end; z-index: 10;
}
#sheet[hidden] { display: none; }
#sheet-card {
  background: var(--bg); width: 100%; max-width: 560px; margin: 0 auto;
  padding: 22px 20px calc(20px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--ink);
}
#sheet-close { margin-top: 18px; color: var(--mut); }
.form-actions { margin-top: 26px; display: flex; gap: 24px; align-items: baseline; }
.btn-primary {
  border-bottom: 1px solid var(--ink); padding-bottom: 4px; font-size: 1rem;
}
.err { color: var(--accent); font-size: 0.85rem; margin-top: 10px; }
.ok { color: var(--good); font-size: 0.85rem; margin-top: 10px; }
.detail { padding: 8px 0 14px; border-bottom: 1px solid var(--line); }
.detail .d-actions { display: flex; gap: 18px; margin-top: 10px; flex-wrap: wrap; }
.detail .d-actions .linklike { font-size: 0.85rem; }
.muted-note { color: var(--mut); font-size: 0.82rem; }
.empty { color: var(--mut); padding: 30px 0; text-align: center; font-size: 0.9rem; }
.auth-wrap { max-width: 400px; margin: 15vh auto 0; }
.auth-wrap h1 { font-weight: 200; font-size: 2.4rem; letter-spacing: -0.02em; margin-bottom: 6px; }
.auth-wrap .sub { color: var(--mut); margin-bottom: 30px; }
.claim-list { margin-top: 36px; }