/* Matt Payments: spec-sheet look. Concrete neutrals, ink, hairline rules,
   square corners. Color only carries state: green paid, yellow waiting,
   signal orange for money you owe. */

:root {
  --bg: oklch(0.945 0.005 75);
  --panel: oklch(0.982 0.003 75);
  --panel-2: oklch(0.962 0.004 75);
  --ink: oklch(0.235 0.008 60);
  --ink-2: oklch(0.47 0.01 65);
  --ink-3: oklch(0.62 0.01 70);
  --rule: oklch(0.87 0.006 75);
  --rule-2: oklch(0.74 0.008 75);
  --bar: oklch(0.235 0.008 60);
  --bar-2: oklch(0.32 0.008 60);
  --bar-ink: oklch(0.95 0.004 75);
  --bar-ink-2: oklch(0.72 0.008 75);

  --paid: oklch(0.56 0.12 150);
  --paid-tint: oklch(0.94 0.035 150);
  --wait: oklch(0.83 0.15 88);
  --wait-tint: oklch(0.95 0.06 92);
  --wait-ink: oklch(0.42 0.08 80);
  --owe: oklch(0.62 0.18 42);
  --owe-tint: oklch(0.95 0.03 45);
  --focus: oklch(0.62 0.18 42);

  --sans: "Barlow", system-ui, sans-serif;
  --label: "Barlow Semi Condensed", "Barlow", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --r: 2px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* Dark theme: follows the device unless Settings picked light or dark
   (html[data-theme], set in index.html before first paint). Keep the two
   dark blocks identical. */
:root { color-scheme: light; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: oklch(0.2 0.006 60);
    --panel: oklch(0.235 0.006 60);
    --panel-2: oklch(0.265 0.006 60);
    --ink: oklch(0.93 0.004 75);
    --ink-2: oklch(0.72 0.008 75);
    --ink-3: oklch(0.58 0.008 75);
    --rule: oklch(0.32 0.006 60);
    --rule-2: oklch(0.44 0.008 60);
    --bar: oklch(0.155 0.005 60);
    --bar-2: oklch(0.27 0.006 60);
    --paid: oklch(0.72 0.13 150);
    --paid-tint: oklch(0.3 0.04 150);
    --wait: oklch(0.83 0.14 88);
    --wait-tint: oklch(0.33 0.05 88);
    --wait-ink: oklch(0.88 0.1 90);
    --owe: oklch(0.72 0.16 45);
    --owe-tint: oklch(0.3 0.04 45);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: oklch(0.2 0.006 60);
  --panel: oklch(0.235 0.006 60);
  --panel-2: oklch(0.265 0.006 60);
  --ink: oklch(0.93 0.004 75);
  --ink-2: oklch(0.72 0.008 75);
  --ink-3: oklch(0.58 0.008 75);
  --rule: oklch(0.32 0.006 60);
  --rule-2: oklch(0.44 0.008 60);
  --bar: oklch(0.155 0.005 60);
  --bar-2: oklch(0.27 0.006 60);
  --paid: oklch(0.72 0.13 150);
  --paid-tint: oklch(0.3 0.04 150);
  --wait: oklch(0.83 0.14 88);
  --wait-tint: oklch(0.33 0.05 88);
  --wait-ink: oklch(0.88 0.1 90);
  --owe: oklch(0.72 0.16 45);
  --owe-tint: oklch(0.3 0.04 45);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 15px/1.45 var(--sans);
  font-feature-settings: "tnum" 1;
}
button, input, select { font: inherit; color: inherit; }
h1, h2, h3, p { margin: 0; }
.icon { flex: none; display: block; }
.num { font-family: var(--mono); font-size: 0.93em; letter-spacing: -0.01em; }
.loading { padding: 48px 16px; text-align: center; color: var(--ink-3); font: 500 12px var(--label); letter-spacing: 0.12em; text-transform: uppercase; }
.dim { color: var(--ink-2); }
.label {
  font: 600 11.5px/1 var(--label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
}

/* ---------------------------------------------------------------- controls */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border: 1px solid var(--rule-2);
  border-radius: var(--r);
  background: var(--panel);
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 150ms var(--ease), border-color 150ms var(--ease);
}
.btn:hover:not(:disabled) { border-color: var(--ink); }
.btn:active:not(:disabled) { background: var(--panel-2); }
.btn:disabled { opacity: 0.45; cursor: default; }
.btn.primary { background: var(--ink); border-color: var(--ink); color: var(--panel); }
.btn.primary:hover:not(:disabled) { background: var(--ink-2); border-color: var(--ink-2); }
.btn.confirm { background: var(--paid); border-color: var(--paid); color: var(--panel); }
.btn.confirm:hover:not(:disabled) { filter: brightness(1.08); border-color: var(--paid); }
.btn.quiet { border-color: transparent; background: transparent; color: var(--ink-2); }
.btn.quiet:hover:not(:disabled) { border-color: var(--rule-2); color: var(--ink); }
.btn.sm { height: 28px; padding: 0 9px; font-size: 13px; }
.btn.icon-only { width: 32px; padding: 0; justify-content: center; }
.link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: 0;
  padding: 0;
  color: var(--ink);
  font: 500 13px var(--sans);
  text-decoration: underline;
  text-decoration-color: var(--rule-2);
  text-underline-offset: 3px;
  cursor: pointer;
}
.link:hover { text-decoration-color: var(--ink); }

label.field { display: grid; gap: 6px; }
input[type="text"], input[type="password"], input[type="number"], select {
  width: 100%;
  height: 38px;
  padding: 0 10px;
  border: 1px solid var(--rule-2);
  border-radius: var(--r);
  background: var(--panel);
  font-size: 16px; /* stops iOS zooming on focus */
}
input[type="number"] { font-family: var(--mono); font-size: 15px; }
input:hover, select:hover { border-color: var(--ink-3); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; }
input:focus-visible, select:focus-visible { outline-offset: -1px; }
label.check { display: flex; gap: 8px; align-items: center; font-size: 14px; cursor: pointer; }
label.check input { width: 16px; height: 16px; margin: 0; accent-color: var(--ink); }
.error { color: var(--owe); font-size: 13.5px; font-weight: 500; }
.error:empty { display: none; }

/* ---------------------------------------------------------------- login */

.login {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background-color: var(--bg);
  background-image:
    linear-gradient(color-mix(in oklch, var(--rule) 60%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in oklch, var(--rule) 60%, transparent) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: -1px -1px;
}
.login form {
  width: 100%;
  max-width: 340px;
  background: var(--panel);
  border: 1px solid var(--rule-2);
  border-radius: var(--r);
}
.login .plate {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: var(--bar);
  color: var(--bar-ink);
}
.login .plate .label { color: var(--bar-ink-2); margin-left: auto; }
.login .body { display: grid; gap: 16px; padding: 20px 18px 18px; }
.login .btn.primary { height: 40px; justify-content: center; font-size: 15px; }

.wordmark {
  font: 600 16px/1 var(--label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ---------------------------------------------------------------- app bar */

header.bar { background: var(--bar); color: var(--bar-ink); }
header.bar .inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 52px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
header.bar .mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--bar-2);
  border-radius: var(--r);
}
header.bar .who { margin-left: auto; color: var(--bar-ink-2); font-size: 14px; }
header.bar .who strong { color: var(--bar-ink); font-weight: 500; }
header.bar .btn {
  background: transparent;
  border-color: var(--bar-2);
  color: var(--bar-ink);
}
header.bar .btn:hover:not(:disabled) { border-color: var(--bar-ink-2); }

/* ---------------------------------------------------------------- sheet */

/* Panels sit in a grid whose 1px gaps show the rule color, so the page
   reads as one ruled sheet instead of floating cards. */
main { max-width: 1200px; margin: 0 auto; padding: 20px 16px 64px; }
.sheet {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule-2);
  border: 1px solid var(--rule-2);
}
.sheet > * { background: var(--panel); min-width: 0; }
.span-2 { grid-column: span 2; }
.span-3 { grid-column: span 3; }
.span-6 { grid-column: span 6; }

.panel { padding: 16px 18px 18px; }
.panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  min-height: 28px;
  margin-bottom: 12px;
}
.panel-head h2 { font: 600 13px/1 var(--label); letter-spacing: 0.1em; text-transform: uppercase; }
.panel-head .idx { font: 500 11px/1 var(--mono); color: var(--ink-3); }
.panel-head .spacer { flex: 1; }

/* Readouts */
.readout { padding: 14px 18px 16px; display: grid; gap: 8px; align-content: start; }
.readout .value { font: 500 28px/1.05 var(--mono); letter-spacing: -0.03em; }
.readout .sub { font-size: 13px; color: var(--ink-2); }
.readout.owing .value { color: var(--owe); }
.readout.clear .value { color: var(--paid); }
.readout.attention { background: var(--wait-tint); }

/* Notice */
.notice {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--wait-tint);
  color: var(--ink);
  font-size: 14px;
}
.notice .icon { color: var(--wait-ink); }

/* Ledger rows */
.rows { list-style: none; margin: 0; padding: 0; }
.rows li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 12px;
  padding: 9px 0;
  border-top: 1px solid var(--rule);
}
.rows li:first-child { border-top: 0; padding-top: 2px; }
.rows .what { min-width: 0; }
.rows .what .meta { display: block; font-size: 13px; color: var(--ink-2); }
.rows .amt { font: 500 14px var(--mono); text-align: right; }
.rows .actions { display: flex; gap: 6px; justify-content: flex-end; }
.empty { color: var(--ink-2); font-size: 14px; }
details.more { margin-top: 10px; border-top: 1px solid var(--rule); }
details.more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
  padding-top: 10px;
  font-size: 13px;
  color: var(--ink-2);
}
details.more summary::-webkit-details-marker { display: none; }
details.more summary .icon { transition: transform 150ms var(--ease); }
details.more[open] summary .icon { transform: rotate(90deg); }
details.more[open] summary { margin-bottom: 4px; }

/* Status markers: squares, not dots */
.mark { width: 10px; height: 10px; border-radius: 1px; flex: none; display: inline-block; }
.mark.paid { background: var(--paid); }
.mark.claimed { background: var(--wait); }
.mark.unpaid { border: 1.5px solid var(--ink-3); }
.legend { display: flex; gap: 16px; flex-wrap: wrap; }
.legend span { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--ink-2); }

/* ---------------------------------------------------------------- month ledger */

.month-nav { display: flex; align-items: center; gap: 4px; }
.month-picker { position: relative; }
.picker-btn { height: 28px; min-width: 190px; padding: 0 10px; gap: 8px; }
.picker-btn .icon { margin-left: auto; color: var(--ink-2); }
.now {
  font: 600 10px/1 var(--label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 5px 2px;
  background: var(--ink);
  color: var(--panel);
  border-radius: 1px;
}
.mark.none { border: 1.5px dotted var(--ink-3); }
.mark.future { border: 1.5px solid var(--rule-2); }

.month-list {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  z-index: 20;
  width: 280px;
  max-height: 340px;
  overflow-y: auto;
  margin: 0;
  padding: 4px 0;
  list-style: none;
  background: var(--panel);
  border: 1px solid var(--ink-3);
  border-radius: var(--r);
  box-shadow: 0 8px 24px oklch(0.2 0.01 60 / 0.14);
}
.month-list:focus { outline: none; }
.month-list li {
  display: flex;
  align-items: center;
  gap: 9px;
  height: 36px;
  padding: 0 12px;
  font-size: 14px;
  cursor: pointer;
}
.month-list li .s { margin-left: auto; font: 500 12px var(--sans); color: var(--ink-2); }
.month-list li.future .m, .month-list li.future .s { color: var(--ink-3); }
.month-list li:hover, .month-list li.active { background: var(--panel-2); }
.month-list li.active { outline: 1px solid var(--ink-3); outline-offset: -1px; }
.month-list li[aria-selected="true"] .m { font-weight: 600; }

.editor {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 14px 18px;
  padding: 14px;
  margin-bottom: 14px;
  background: var(--panel-2);
  border: 1px solid var(--rule-2);
}
.editor .field { width: 150px; }
.editor .checks { display: grid; gap: 6px; padding-bottom: 4px; }
.editor .hint { font-size: 13px; color: var(--ink-2); padding-bottom: 9px; }
.editor .actions { display: flex; gap: 6px; margin-left: auto; }

.ledger { width: 100%; border-collapse: collapse; table-layout: fixed; }
.ledger th, .ledger td { text-align: left; padding: 0; }
.ledger thead th {
  padding: 0 10px 10px;
  vertical-align: bottom;
  border-bottom: 1px solid var(--rule-2);
  font-weight: 400;
}
.ledger thead th:first-child { width: 96px; padding-left: 0; }
.ledger .exp { display: grid; gap: 3px; }
.ledger .exp .name { font: 600 13px/1 var(--label); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink); }
.ledger .exp .to { font-size: 13px; color: var(--ink-2); }
.ledger .exp .total { display: flex; align-items: center; gap: 8px; font: 500 13.5px var(--mono); min-height: 20px; }
.ledger tbody th {
  font-weight: 500;
  padding: 0 10px 0 0;
  white-space: nowrap;
  border-bottom: 1px solid var(--rule);
}
.ledger tbody td { border-bottom: 1px solid var(--rule); border-left: 1px solid var(--rule); }
.ledger tr.me th { color: var(--ink); }
.ledger tr.me th::after { content: "YOU"; margin-left: 6px; font: 600 10px var(--label); letter-spacing: 0.1em; color: var(--ink-3); }
.ledger tfoot td { padding: 8px 10px 0; font: 500 12px var(--mono); color: var(--ink-2); }

.tag {
  display: inline-block;
  font: 600 10.5px/1 var(--label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 5px;
  border: 1px solid currentColor;
  border-radius: 1px;
  color: var(--ink-3);
}
.tag.paid { color: var(--paid); }

.cell {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  height: 40px;
  padding: 0 10px;
  background: transparent;
  border: 0;
  text-align: left;
  font-size: 14px;
}
.cell .num { flex: 1; }
.cell .state { font: 600 10.5px/1 var(--label); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.cell.paid .state { color: var(--paid); }
.cell.claimed { background: var(--wait-tint); }
.cell.claimed .state { color: var(--wait-ink); }
.cell.unpaid .state { color: var(--ink-3); }
tr.me .cell.unpaid .state, .person.me .cell.unpaid .state { color: var(--owe); }
.cell.none { color: var(--ink-3); }
button.cell { cursor: pointer; transition: background-color 150ms var(--ease); }
button.cell:hover { background: var(--panel-2); box-shadow: inset 0 0 0 1px var(--ink-3); }
button.cell.claimed:hover { background: var(--wait-tint); }
button.cell:focus-visible { outline-offset: -2px; }

/* Saving: the change already shows; a thin bar sweeps along the bottom of
   whatever is still being written to the server. */
.cell, .rows li { position: relative; }
.cell.saving .state { color: var(--ink-2); }
.cell.saving::after, .rows li.saving::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--ink-2) 50%, transparent 100%) no-repeat;
  background-size: 40% 100%;
  animation: sweep 900ms var(--ease) infinite;
}
.rows li.saving .meta { color: var(--ink-2); }
.tag.saving { color: var(--ink-2); animation: blink 1s steps(2, jump-none) infinite; }
@keyframes sweep {
  from { background-position: -60% 0; }
  to { background-position: 160% 0; }
}
@keyframes blink {
  50% { opacity: 0.35; }
}

.sync {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-width: 70px;
  font: 600 11px/1 var(--label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bar-ink-2);
}
.sync .pulse { width: 7px; height: 7px; background: var(--wait); animation: blink 900ms steps(2, jump-none) infinite; }
.sync.saved { color: var(--paid); }

/* Phone ledger: one block per expense */
.exp-blocks { display: none; }
.exp-block { border-top: 1px solid var(--rule-2); padding: 12px 0 4px; }
.exp-block:first-child { border-top: 0; padding-top: 0; }
.exp-block .head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; margin-bottom: 6px; }
.exp-block .head .name { font: 600 13px/1 var(--label); letter-spacing: 0.1em; text-transform: uppercase; }
.exp-block .head .right { display: flex; align-items: center; gap: 10px; font: 500 13.5px var(--mono); }
.exp-block .person { display: grid; grid-template-columns: 84px 1fr; align-items: center; border-top: 1px solid var(--rule); }
.exp-block .person .who { font-weight: 500; font-size: 14px; }
.exp-block .person.me .who::after { content: "YOU"; margin-left: 6px; font: 600 10px var(--label); letter-spacing: 0.1em; color: var(--ink-3); }
.exp-block .foot { font: 500 12px var(--mono); color: var(--ink-2); padding-top: 6px; }

/* Roster + activity */
.roster { width: 100%; border-collapse: collapse; }
.roster td { padding: 9px 0; border-top: 1px solid var(--rule); vertical-align: middle; }
.roster tr:first-child td { border-top: 0; padding-top: 2px; }
.roster td.m { width: 22px; }
.roster .runs { font-size: 13px; color: var(--ink-2); }
.roster td.amt { text-align: right; font: 500 14px var(--mono); }
.roster td.amt.clear { color: var(--ink-3); font-family: var(--sans); font-size: 13px; }

.log { list-style: none; margin: 0; padding: 0; font-size: 14px; }
.log li { display: grid; grid-template-columns: 104px 1fr; gap: 12px; padding: 8px 0; border-top: 1px solid var(--rule); }
.log li:first-child { border-top: 0; padding-top: 2px; }
.log time { font: 400 12px/1.7 var(--mono); color: var(--ink-3); }

/* Settings */
.settings { max-width: 440px; display: grid; gap: 28px; }
.settings form { display: grid; gap: 14px; }
.settings h3 { font: 600 13px/1 var(--label); letter-spacing: 0.1em; text-transform: uppercase; }
.settings .hint { font-size: 13.5px; color: var(--ink-2); margin-top: -6px; }
.settings .row-end { display: flex; justify-content: flex-start; }
.settings fieldset { border: 0; margin: 0; padding: 0; display: grid; gap: 14px; }
.settings legend { padding: 0; margin-bottom: 14px; }

/* Segmented control: radio buttons joined into one ruled strip */
.segmented { display: inline-flex; border: 1px solid var(--rule-2); border-radius: var(--r); width: fit-content; }
.segmented label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 34px;
  padding: 0 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
  cursor: pointer;
  border-left: 1px solid var(--rule-2);
  transition: background-color 150ms var(--ease), color 150ms var(--ease);
}
.segmented label:first-child { border-left: 0; }
.segmented label:hover { color: var(--ink); background: var(--panel-2); }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented label:has(input:checked) { background: var(--ink); color: var(--panel); }
.segmented label:has(input:focus-visible) { outline: 2px solid var(--focus); outline-offset: 1px; }

/* Toast */
#toast {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translate(-50%, 12px);
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--ink);
  color: var(--panel);
  padding: 10px 14px;
  border-radius: var(--r);
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms var(--ease), transform 180ms var(--ease);
  max-width: calc(100vw - 32px);
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }
#toast.bad { background: var(--owe); color: oklch(0.99 0.003 45); }

/* ---------------------------------------------------------------- responsive */

@media (max-width: 900px) {
  .span-3 { grid-column: span 6; }
  .ledger-wrap { display: none; }
  .exp-blocks { display: block; }
}
@media (max-width: 640px) {
  main { padding: 0 0 48px; }
  .sheet { border-left: 0; border-right: 0; }
  .span-2 { grid-column: span 3; }
  .span-2.first { grid-column: span 6; }
  .readout .value { font-size: 24px; }
  .panel, .readout, .notice { padding-left: 16px; padding-right: 16px; }
  header.bar .who { display: none; }
  header.bar .inner > .spacer-sm { margin-left: auto; }
  header.bar .btn .txt { display: none; }
  header.bar .btn { width: 32px; padding: 0; justify-content: center; }
  .rows li { grid-template-columns: 12px minmax(0, 1fr) auto; }
  .rows .actions { grid-column: 2 / -1; justify-content: flex-start; }
  .log li { grid-template-columns: 1fr; gap: 0; }
  .editor .field { width: 100%; }
  .month-list { left: 0; right: auto; width: min(280px, calc(100vw - 32px)); }
  .picker-btn { min-width: 0; }
  .editor .actions { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .cell.saving::after, .rows li.saving::after { animation: none; background-size: 100% 100%; opacity: 0.5; }
  .tag.saving, .sync .pulse { animation: none; }
}

[hidden] { display: none !important; }