:root {
  --paper: #f6f1e7;
  --paper-2: #fffdf8;
  --ink: #1f2420;
  --ink-2: #5b6159;
  --line: #e2dbcb;
  --accent: #204a3b;
  --accent-ink: #f4efe4;
  --pos: #1f7a4d;
  --neg: #b5472a;
  --zero: #7a7f78;
  --danger: #a5311b;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(31, 36, 32, .06), 0 8px 24px -12px rgba(31, 36, 32, .25);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #16191a; --paper-2: #1f2325; --ink: #ece7dc; --ink-2: #a9a69c;
    --line: #2d3234; --accent: #7fc9a6; --accent-ink: #0f1d17;
    --pos: #6fcf97; --neg: #f08a6a; --zero: #8b918d; --danger: #f07a62;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
  }
}
* { box-sizing: border-box; }
html { background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.45; -webkit-text-size-adjust: 100%; }
body { margin: 0; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, .brand, .big { font-family: var(--serif); font-weight: 600; letter-spacing: -.01em; }
h1 { font-size: 1.9rem; margin: 0 0 .75rem; }
h2 { font-size: 1.15rem; margin: 0 0 .75rem; }
h3 { font-size: 1rem; margin: 1.25rem 0 .5rem; }
p { margin: 0 0 .75rem; }
small, .small { font-size: .82rem; }
.muted { color: var(--ink-2); }
.error { color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, transparent); border-left: 3px solid var(--danger); padding: .5rem .75rem; border-radius: 6px; }

.topbar { display: flex; align-items: center; justify-content: space-between; padding: .8rem clamp(1rem, 4vw, 2.5rem); border-bottom: 1px solid var(--line); background: var(--paper); position: sticky; top: 0; z-index: 5; }
.brand { font-size: 1.35rem; color: var(--ink); }
.brand::before { content: "÷"; display: inline-grid; place-items: center; width: 1.6em; height: 1.6em; margin-right: .5rem; border-radius: .45em; background: var(--accent); color: var(--accent-ink); font-size: .85em; vertical-align: -.2em; }
.topnav { display: flex; gap: 1rem; align-items: center; }
.who { color: var(--ink); font-weight: 500; }
.page { max-width: 880px; margin: 0 auto; padding: 1.5rem clamp(1rem, 4vw, 2.5rem) 4rem; }
.pagehead { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.crumbs { color: var(--ink-2); font-size: .85rem; margin-bottom: .25rem; }

.card { background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; box-shadow: var(--shadow); margin-bottom: 1.25rem; }
.card.narrow { max-width: 460px; margin-left: auto; margin-right: auto; }
.card.empty { text-align: center; color: var(--ink-2); }
.card.danger { border-color: color-mix(in srgb, var(--danger) 40%, var(--line)); }
.columns { display: grid; gap: 1.25rem; grid-template-columns: 1fr; }
@media (min-width: 680px) { .columns { grid-template-columns: 1fr 1fr; } }

.flash { padding: .6rem 1rem; border-radius: 10px; margin-bottom: 1rem; background: color-mix(in srgb, var(--accent) 12%, transparent); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }
.flash-error { background: color-mix(in srgb, var(--danger) 12%, transparent); border-color: color-mix(in srgb, var(--danger) 40%, transparent); }

.hero { border-radius: var(--radius); padding: 1.5rem 1.25rem; margin-bottom: 1.25rem; color: var(--accent-ink); background: var(--accent); display: flex; flex-wrap: wrap; align-items: center; gap: .25rem 1.5rem; }
.hero.neg { background: var(--neg); }
.hero.zero { background: var(--zero); }
.hero .lead { margin: 0; opacity: .85; text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; flex-basis: 100%; }
.hero .big { font-size: clamp(2rem, 6vw, 2.8rem); margin: 0; line-height: 1.1; }
.hero .actions { margin-left: auto; display: flex; gap: .5rem; }
.hero .button { background: var(--accent-ink); color: var(--ink); border-color: transparent; }
.hero .button.primary { background: var(--paper-2); color: var(--accent); }
@media (prefers-color-scheme: dark) { .hero .button.primary { background: var(--ink); color: var(--accent-ink); } }

.button, button { font: inherit; font-weight: 500; border: 1px solid var(--line); background: var(--paper-2); color: var(--ink); border-radius: 10px; padding: .55rem 1rem; cursor: pointer; display: inline-block; line-height: 1.2; transition: transform .08s ease, box-shadow .15s ease; }
.button:hover, button:hover { text-decoration: none; box-shadow: var(--shadow); }
.button:active, button:active { transform: translateY(1px); }
.primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.danger { background: var(--danger); color: #fff; border-color: transparent; }
.danger-outline { color: var(--danger); border-color: var(--danger); background: transparent; }
button.small { padding: .25rem .6rem; font-size: .8rem; }
.linkish { background: none; border: 0; padding: 0; color: var(--accent); font-weight: 500; cursor: pointer; }
.linkish:hover { text-decoration: underline; box-shadow: none; }
.inline { display: inline; }
.iconbtn { border: 0; background: transparent; color: var(--ink-2); font-size: 1.2rem; padding: 0 .4rem; line-height: 1; }
.iconbtn:hover { color: var(--danger); box-shadow: none; }

form label { display: block; margin-bottom: .9rem; font-weight: 500; font-size: .9rem; }
form label input, form label select, form label textarea { display: block; width: 100%; margin-top: .3rem; font: inherit; padding: .55rem .7rem; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); color: var(--ink); }
form input:focus, form select:focus, form textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 50%, transparent); outline-offset: 1px; border-color: var(--accent); }
.row { display: flex; gap: .75rem; flex-wrap: wrap; align-items: center; }
.row > label { flex: 1 1 160px; }
.stack { margin-top: 1rem; }
fieldset.split { border: 1px solid var(--line); border-radius: var(--radius); padding: .9rem 1rem 0.5rem; margin: 0 0 1rem; }
legend { font-weight: 600; font-family: var(--serif); padding: 0 .4rem; }
.segmented { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .75rem; }
.segmented label { margin: 0; font-weight: 500; }
.segmented input { position: absolute; opacity: 0; width: 0; height: 0; }
.segmented label { border: 1px solid var(--line); border-radius: 999px; padding: .35rem .8rem; cursor: pointer; font-size: .85rem; }
.segmented label:has(input:checked) { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.participants { list-style: none; margin: 0; padding: 0; }
.participants li { display: grid; grid-template-columns: 1fr 110px 70px; gap: .6rem; align-items: center; padding: .35rem 0; border-top: 1px dashed var(--line); }
.participants li:first-child { border-top: 0; }
.participants label.check { margin: 0; display: flex; align-items: center; gap: .5rem; font-weight: 500; }
.participants label.check input { width: auto; margin: 0; }
.participants .val { font: inherit; padding: .35rem .5rem; border: 1px solid var(--line); border-radius: 8px; background: var(--paper); color: var(--ink); width: 100%; text-align: right; }
.participants .val:disabled { opacity: .35; }
.mode-equal .participants .val { visibility: hidden; }
.preview { text-align: right; font-variant-numeric: tabular-nums; }
.check input[type=checkbox] { accent-color: var(--accent); }

.grouplist, .balances, .transfers, .expenses, .members { list-style: none; margin: 0; padding: 0; }
.grouprow { display: flex; justify-content: space-between; align-items: center; gap: 1rem; background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.25rem; margin-bottom: .6rem; color: var(--ink); box-shadow: var(--shadow); transition: transform .1s ease; }
.grouprow:hover { text-decoration: none; transform: translateY(-1px); }
.groupname { font-family: var(--serif); font-size: 1.2rem; font-weight: 600; }
.amt { font-variant-numeric: tabular-nums; font-weight: 600; white-space: nowrap; }
.amt.pos, em.pos { color: var(--pos); }
.amt.neg, em.neg { color: var(--neg); }
.amt.zero, em.zero { color: var(--zero); font-weight: 500; }
.balances li, .members li { display: flex; justify-content: space-between; gap: 1rem; padding: .45rem 0; border-top: 1px dashed var(--line); }
.balances li:first-child, .members li:first-child { border-top: 0; }
.transfers li { display: grid; grid-template-columns: 1fr auto 1fr auto; gap: .5rem; align-items: center; padding: .45rem 0; border-top: 1px dashed var(--line); }
.transfers li:first-child { border-top: 0; }
.transfers li.mine { font-weight: 600; }
.transfers .arrow { color: var(--ink-2); }
.expenses li { display: grid; grid-template-columns: 44px 1fr auto 28px; gap: .75rem; align-items: center; padding: .6rem 0; border-top: 1px dashed var(--line); }
.expenses li:first-child { border-top: 0; }
.expenses li.settlement { background: color-mix(in srgb, var(--accent) 6%, transparent); margin: 0 -.5rem; padding: .6rem .5rem; border-radius: 8px; }
.expenses .date { display: flex; flex-direction: column; align-items: center; line-height: 1.1; font-variant-numeric: tabular-nums; font-weight: 600; color: var(--ink-2); font-size: 1.3rem; }
.expenses .date small { font-weight: 500; font-size: .68rem; margin-top: .2rem; }
.expenses .what { display: flex; flex-direction: column; min-width: 0; }
.expenses .what a { color: var(--ink); }
.expenses .what small { color: var(--ink-2); }
.expenses .delta { display: flex; flex-direction: column; align-items: flex-end; font-variant-numeric: tabular-nums; font-weight: 600; }
.expenses .delta em { font-style: normal; font-size: .7rem; font-weight: 500; text-transform: uppercase; letter-spacing: .05em; }
.invite { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }
.invite code { background: var(--paper); border: 1px solid var(--line); padding: .4rem .6rem; border-radius: 8px; font-size: .8rem; word-break: break-all; }
.categories { list-style: none; margin: 0; padding: 0; }
.categories li { display: grid; grid-template-columns: auto 1fr auto; gap: .75rem; align-items: center; padding: .4rem 0; border-top: 1px dashed var(--line); }
.categories li:first-child { border-top: 0; }
.categories .catlabel { white-space: nowrap; }
.categories .bar { display: block; min-width: 60px; height: 8px; border-radius: 999px; background: var(--line); overflow: hidden; }
.categories .bar span { display: block; height: 100%; background: var(--accent); border-radius: 999px; }
.cardhead { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; }