:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef1f5;
  --ink: #16202b;
  --ink-soft: #5b6875;
  --line: #d8dee6;
  --accent: #0d5c8a;
  --accent-ink: #ffffff;
  --owe: #b3401f;
  --gain: #1c6b45;
  --warn-bg: #fdf3e2;
  --warn-line: #e0b872;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 32, 48, .06), 0 4px 14px rgba(16, 32, 48, .05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10151b;
    --surface: #18202a;
    --surface-2: #212b37;
    --ink: #e6ecf3;
    --ink-soft: #9aa8b7;
    --line: #2d3947;
    --accent: #4aa3d8;
    --accent-ink: #0b1218;
    --owe: #ef8f6d;
    --gain: #6fce9f;
    --warn-bg: #33291a;
    --warn-line: #7a6132;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 14px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3 { line-height: 1.25; margin: 0; }
h1 { font-size: 1.05rem; letter-spacing: .01em; }
h2 { font-size: 1.15rem; }
h3 { font-size: .95rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-soft); }
p { margin: 0; }

/* ---------------------------------------------------------- chrome */

.topbar {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between;
  padding: 12px 20px; background: var(--surface); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; }
.mark { font-size: 1.6rem; }
.tagline { color: var(--ink-soft); font-size: .8rem; }
.topbar-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

.tabs {
  display: flex; gap: 2px; padding: 0 20px; background: var(--surface);
  border-bottom: 1px solid var(--line); overflow-x: auto;
}
.tab {
  border: 0; background: none; color: var(--ink-soft); cursor: pointer;
  padding: 10px 14px; font: inherit; font-size: .92rem; white-space: nowrap;
  border-bottom: 2px solid transparent;
}
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); font-weight: 600; }

main { max-width: 1180px; margin: 0 auto; padding: 22px 20px 80px; display: grid; gap: 18px; }

/* ---------------------------------------------------------- cards */

.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px;
}
.card > header { display: flex; flex-wrap: wrap; gap: 10px; align-items: baseline; justify-content: space-between; margin-bottom: 14px; }
.card > header p { color: var(--ink-soft); font-size: .85rem; }
.stack { display: grid; gap: 12px; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.grow { flex: 1 1 180px; }
.muted { color: var(--ink-soft); font-size: .85rem; }
.empty { color: var(--ink-soft); padding: 26px 0; text-align: center; }

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

label { display: grid; gap: 4px; font-size: .78rem; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .05em; }

input, select, textarea, button { font: inherit; }
input, select, textarea {
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 7px;
  background: var(--surface); color: var(--ink); min-width: 0; width: 100%;
}
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}
textarea { min-height: 110px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .85rem; }

button {
  cursor: pointer; border-radius: 7px; padding: 8px 14px; border: 1px solid var(--line);
  background: var(--surface-2); color: var(--ink);
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
button.ghost { background: transparent; }
button.danger { color: var(--owe); }
button.small { padding: 4px 9px; font-size: .8rem; }

.file-button { position: relative; overflow: hidden; display: inline-block; }
.file-button input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; }

/* ---------------------------------------------------------- tables */

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-soft); font-weight: 600; }
tbody tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
td input, td select { padding: 5px 7px; font-size: .88rem; }
tr.is-mine { background: color-mix(in srgb, var(--accent) 8%, transparent); }
tr.needs-check td { background: var(--warn-bg); }
td.dropped { color: var(--ink-soft); text-decoration: line-through; }
.owe { color: var(--owe); font-variant-numeric: tabular-nums; font-weight: 600; }
.gain { color: var(--gain); font-variant-numeric: tabular-nums; font-weight: 600; }
.pill {
  display: inline-block; padding: 1px 7px; border-radius: 999px; font-size: .72rem;
  background: var(--surface-2); color: var(--ink-soft); border: 1px solid var(--line);
}

/* ---------------------------------------------------------- misc */

.notice {
  background: var(--warn-bg); border: 1px solid var(--warn-line);
  border-radius: 7px; padding: 10px 12px; font-size: .87rem;
}
.toast {
  position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%);
  background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 8px;
  box-shadow: var(--shadow); z-index: 50; max-width: min(560px, 92vw); font-size: .9rem;
}
.toast[data-tone="error"] { background: var(--owe); color: #fff; }

dialog {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 20px;
  background: var(--surface); color: var(--ink); max-width: min(520px, 92vw); box-shadow: var(--shadow);
}
dialog::backdrop { background: rgba(8, 14, 20, .5); }
dialog h2 { margin-bottom: 14px; }
dialog menu { display: flex; justify-content: flex-end; gap: 8px; margin: 18px 0 0; padding: 0; }
#modal-body { display: grid; gap: 12px; }

.spinner {
  display: inline-block; width: 14px; height: 14px; vertical-align: -2px;
  border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation-duration: 2s; } }

@media (max-width: 620px) {
  .topbar { padding: 10px 14px; }
  main { padding: 16px 14px 70px; }
  .tabs { padding: 0 8px; }
  .card { padding: 14px; }
}