/* Divido - shared bill splitter. Calm, adult, clinical-but-warm.
   Neutral skeleton shared with the appnest family; the amber accent is Divido's own.
   Divido is a STANDALONE tool - it deliberately does not cross-link that family. */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #1c2430;
  --ink-soft: #5b6674;
  --ink-faint: #8d97a5;
  --accent: #b7791f;        /* warm amber - Divido's identity */
  --accent-ink: #ffffff;
  --accent-soft: #f8eed8;
  --line: #e3e7ec;
  --input-bg: #fbfcfd;
  --input-focus-bg: #ffffff;
  --btn-primary-hover: #9a6516;
  --chip-hover: #f0e2c4;
  --summary-bg: #f3f5f7;
  /* semantic colours - kept separate from the accent so "owed" vs "owes" reads at a glance */
  --good: #2f7d4f;
  --good-soft: #e6f2ec;
  --danger: #b3423a;
  --danger-soft: #fdecea;
  --del-hover-bg: #fdf1f0;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 4px 16px rgba(16, 24, 40, .06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
}
.tnum { font-variant-numeric: tabular-nums; }

/* ---------------- top bar ---------------- */

.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 880px;
  margin: 0 auto;
  padding: 18px 20px 10px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -.01em;
}
.tagline { color: var(--ink-faint); font-size: .85rem; }
.topbar-controls { margin-left: auto; display: flex; gap: 8px; }

.unit-toggle { display: inline-flex; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; }
.unit-toggle button {
  border: none;
  background: var(--surface);
  color: var(--ink-faint);
  font: inherit;
  font-size: .72rem;
  font-weight: 700;
  line-height: 1;
  padding: 6px 9px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}
.unit-toggle button.on { background: var(--accent); color: var(--accent-ink); }
.unit-toggle button svg { display: block; }

main { max-width: 880px; margin: 0 auto; padding: 0 20px 48px; }

/* ---------------- buttons ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 9px 16px;
  font: inherit;
  font-weight: 600;
  font-size: .92rem;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, border-color .15s, transform .05s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--btn-primary-hover); }
.btn-ghost { background: var(--surface); border-color: var(--line); color: var(--ink-soft); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-lg { padding: 13px 26px; font-size: 1.05rem; }
.btn-sm { padding: 6px 11px; font-size: .82rem; border-radius: 8px; }
.btn-danger { color: var(--danger); border-color: var(--line); background: var(--surface); }
.btn-danger:hover { background: var(--del-hover-bg); border-color: var(--danger); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

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

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-top: 16px;
}
.card h2 { margin: 0 0 14px; font-size: 1.05rem; letter-spacing: -.01em; }

/* ---------------- landing ---------------- */

.hero { text-align: center; padding: 52px 0 28px; }
.hero h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); letter-spacing: -.02em; line-height: 1.2; margin: 0 0 16px; text-wrap: balance; }
.lede { max-width: 560px; margin: 0 auto 8px; color: var(--ink-soft); font-size: 1.05rem; }

.create h2 { margin-top: 0; }
.member-inputs { display: flex; flex-direction: column; gap: 8px; margin: 6px 0 12px; }
.member-input-row { display: flex; gap: 8px; align-items: center; }
.member-input-row input { flex: 1; }
.field-label { font-size: .8rem; font-weight: 600; color: var(--ink-soft); display: block; margin-bottom: 5px; }
.create-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 14px; }

.recent { margin-top: 22px; font-size: .9rem; color: var(--ink-soft); }
.recent h2 { font-size: .95rem; }
.recent ul { list-style: none; margin: 8px 0 0; padding: 0; }
.recent li { padding: 6px 0; border-top: 1px solid var(--line); display: flex; gap: 10px; align-items: center; }
.recent li:first-child { border-top: none; }
.recent a { color: var(--accent); font-weight: 600; text-decoration: none; }
.recent a:hover { text-decoration: underline; }
.recent .when { color: var(--ink-faint); font-size: .8rem; margin-left: auto; }

/* ---------------- household header ---------------- */

.hh { display: flex; align-items: flex-start; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.hh-name { font-size: 1.45rem; font-weight: 700; letter-spacing: -.02em; }
.hh-sub { color: var(--ink-faint); font-size: .9rem; }
.hh-actions { margin-left: auto; display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------------- balances ---------------- */

.bal-row {
  display: grid;
  grid-template-columns: 1.3fr 1fr 2.2fr;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
}
.bal-row:first-of-type { border-top: none; }
.member { display: flex; align-items: center; gap: 9px; font-weight: 600; min-width: 0; }
.member .nm { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dot {
  width: 22px; height: 22px; border-radius: 50%;
  color: #fff; font-size: .72rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.bal-amt { font-weight: 700; font-size: 1.02rem; text-align: right; }
.bal-amt .lbl { font-size: .72rem; font-weight: 600; color: var(--ink-faint); }
.bal-amt.pos { color: var(--good); }
.bal-amt.neg { color: var(--danger); }
.bal-amt.zero { color: var(--ink-faint); }
.bar-wrap { position: relative; height: 12px; background: var(--summary-bg); border-radius: 999px; overflow: hidden; }
.bar { position: absolute; top: 0; bottom: 0; border-radius: 999px; }
.bar.pos { background: var(--good); left: 50%; }
.bar.neg { background: var(--danger); right: 50%; }
.bal-mid { position: absolute; left: 50%; top: -3px; bottom: -3px; width: 1px; background: var(--ink-faint); opacity: .4; }

.settle { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.settle-label { font-size: .72rem; font-weight: 700; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .05em; }
.transfer { background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 4px 11px; font-size: .85rem; font-weight: 600; }
.settle.zero .transfer { background: var(--good-soft); color: var(--good); }

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

.ledger-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.ledger-head h2 { margin: 0; }
.filters { margin-left: auto; display: flex; gap: 8px; }

select, input[type=text], input[type=number], input[type=date] {
  font: inherit;
  background: var(--input-bg);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 9px 10px;
}
select:focus, input:focus { outline: none; border-color: var(--accent); background: var(--input-focus-bg); }
.filters select { padding: 6px 9px; font-size: .85rem; }

.entry { display: grid; grid-template-columns: auto 1fr auto auto; align-items: center; gap: 12px; padding: 12px 0; border-top: 1px solid var(--line); }
.entry:first-of-type { border-top: none; }
.cat { font-size: .66rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--accent); background: var(--accent-soft); border-radius: 6px; padding: 4px 7px; white-space: nowrap; }
.entry-main { min-width: 0; }
.entry-main .desc { font-weight: 600; }
.entry-main .rec { color: var(--accent); }
.entry-main .meta { font-size: .8rem; color: var(--ink-faint); margin-top: 2px; }
.entry-amt { font-weight: 700; text-align: right; white-space: nowrap; }
.entry-actions { display: flex; gap: 4px; }
.icon-btn { border: none; background: none; color: var(--ink-faint); cursor: pointer; border-radius: 7px; padding: 5px 7px; font-size: .95rem; line-height: 1; }
.icon-btn:hover { color: var(--accent); background: var(--chip-hover); }
.icon-btn.del:hover { color: var(--danger); background: var(--del-hover-bg); }

.ledger-foot { display: flex; align-items: center; gap: 10px; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); flex-wrap: wrap; }
.total { font-weight: 700; }
.ledger-foot .spacer { margin-left: auto; }
.empty { color: var(--ink-faint); text-align: center; padding: 18px 0; }

/* payments */
.pay-row { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 12px; padding: 10px 0; border-top: 1px solid var(--line); }
.pay-row:first-of-type { border-top: none; }
.pay-row .meta { font-size: .8rem; color: var(--ink-faint); }

/* share / note */
.note { color: var(--ink-soft); font-size: .85rem; }
.link-row { display: flex; align-items: center; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.link-pill { font-family: var(--mono); font-size: .8rem; background: var(--summary-bg); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; color: var(--ink-soft); overflow-wrap: anywhere; }

/* ---------------- dialog ---------------- */

dialog {
  border: none;
  border-radius: var(--radius);
  box-shadow: 0 8px 40px rgba(16, 24, 40, .25);
  padding: 22px;
  width: min(560px, calc(100vw - 32px));
  background: var(--surface);
  color: var(--ink);
}
dialog::backdrop { background: rgba(20, 28, 38, .45); }
.modal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.modal-head h2 { margin: 0; font-size: 1.1rem; }
.close-x { border: none; background: none; font-size: 1.4rem; color: var(--ink-faint); cursor: pointer; line-height: 1; padding: 0 4px; }
.close-x:hover { color: var(--ink); }

.field { display: flex; flex-direction: column; gap: 5px; margin-bottom: 14px; }
.field > label { font-size: .8rem; font-weight: 600; color: var(--ink-soft); }
.field input, .field select { width: 100%; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip { border: 1px solid var(--line); background: var(--surface); color: var(--ink-soft); border-radius: 999px; padding: 6px 12px; font-size: .85rem; font-weight: 600; cursor: pointer; }
.chip.on { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
.seg button { border: none; background: var(--surface); color: var(--ink-soft); font: inherit; font-weight: 600; font-size: .85rem; padding: 8px 14px; cursor: pointer; }
.seg button.on { background: var(--accent); color: var(--accent-ink); }

.splitline { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 10px; padding: 8px 0; border-top: 1px solid var(--line); }
.splitline:first-of-type { border-top: none; }
.splitline .who { display: flex; align-items: center; gap: 8px; }
.splitline input { width: 100px; text-align: right; }
.splitline .suffix { color: var(--ink-faint); font-size: .85rem; margin-left: 6px; }
.split-hint { font-size: .82rem; font-weight: 600; margin-top: 10px; }
.split-hint.ok { color: var(--good); }
.split-hint.bad { color: var(--danger); }

.member-manage { display: flex; flex-direction: column; gap: 8px; }
.member-manage-row { display: flex; gap: 8px; align-items: center; }
.member-manage-row input { flex: 1; }

.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 18px; }
.cb { width: 17px; height: 17px; accent-color: var(--accent); }
.danger-zone { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }

/* ---------------- footer & toast ---------------- */

.footer { text-align: center; color: var(--ink-faint); font-size: .78rem; padding: 26px 20px; }
.footer-links { display: flex; gap: 8px; justify-content: center; margin-top: 6px; }
.footer-link { color: var(--ink-soft); cursor: pointer; text-decoration: underline; text-underline-offset: 2px; background: none; border: none; font: inherit; }
.footer-link:hover { color: var(--accent); }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 10px;
  font-size: .9rem;
  box-shadow: var(--shadow);
  z-index: 50;
  transition: opacity .2s;
  max-width: calc(100vw - 32px);
}
.toast.err { background: var(--danger); color: #fff; }

@media (max-width: 560px) {
  .bal-row { grid-template-columns: 1fr auto; }
  .bal-row .bar-wrap { grid-column: 1 / -1; }
  .row2, .create-grid { grid-template-columns: 1fr; }
  .entry { grid-template-columns: auto 1fr auto; }
  .entry-actions { grid-column: 2 / -1; justify-content: flex-end; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* ---------------- dark mode ----------------
   Every visual difference is a variable override, so system preference and the
   manual toggle only swap tokens. [data-theme] = explicit choice; absent = follow OS. */
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #10151b;
    --surface: #1a222b;
    --ink: #e7ecf2;
    --ink-soft: #a6b1be;
    --ink-faint: #75808d;
    --accent: #e0a83e;
    --accent-ink: #2a1d05;
    --accent-soft: #3a2c12;
    --line: #2b3542;
    --input-bg: #141b22;
    --input-focus-bg: #10161c;
    --btn-primary-hover: #cf9a32;
    --chip-hover: #4a3a17;
    --summary-bg: #141b22;
    --good: #58b581;
    --good-soft: #173026;
    --danger: #f07b72;
    --danger-soft: #3a1d19;
    --del-hover-bg: #3a2320;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 4px 16px rgba(0, 0, 0, .35);
  }
}
:root[data-theme="dark"] {
  --bg: #10151b;
  --surface: #1a222b;
  --ink: #e7ecf2;
  --ink-soft: #a6b1be;
  --ink-faint: #75808d;
  --accent: #e0a83e;
  --accent-ink: #2a1d05;
  --accent-soft: #3a2c12;
  --line: #2b3542;
  --input-bg: #141b22;
  --input-focus-bg: #10161c;
  --btn-primary-hover: #cf9a32;
  --chip-hover: #4a3a17;
  --summary-bg: #141b22;
  --good: #58b581;
  --good-soft: #173026;
  --danger: #f07b72;
  --danger-soft: #3a1d19;
  --del-hover-bg: #3a2320;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 4px 16px rgba(0, 0, 0, .35);
}

/* ---------------- print (monthly summary) ---------------- */
@media print {
  .topbar-controls, .hh-actions, .filters, .ledger-foot, .entry-actions,
  .pay-row .icon-btn, .footer-links, .share-card { display: none !important; }
  body { background: #fff; color: #000; }
  .card { box-shadow: none; border-color: #ccc; break-inside: avoid; }
}