:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #16181d;
  --muted: #646b78;
  --border: #e2e5ea;
  --accent: #1a9e75;
  --accent-text: #ffffff;
  --positive: #16855f;
  --negative: #c4621a;
  --danger: #c63d3d;
  --backdrop: rgb(10 12 16 / 0.45);
  --pressed: rgb(22 24 29 / 0.06);
  --avatar-l: 88%;
  --avatar-text-l: 30%;
  --radius: 14px;
  --tabbar-height: 56px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101216;
    --surface: #1a1d23;
    --text: #eceef2;
    --muted: #9aa1ad;
    --border: #2b2f37;
    --accent: #2fbf8f;
    --accent-text: #08130f;
    --positive: #3fcf9c;
    --negative: #f09450;
    --danger: #ef6b6b;
    --backdrop: rgb(0 0 0 / 0.6);
    --pressed: rgb(236 238 242 / 0.08);
    --avatar-l: 30%;
    --avatar-text-l: 85%;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}
body.modal-open { overflow: hidden; }

#app {
  max-width: 560px;
  margin: 0 auto;
  padding: calc(env(safe-area-inset-top) + 12px) 16px calc(env(safe-area-inset-bottom) + 32px);
}
/* Leave room for the tab bar and the floating button above it. */
body.signed-in #app { padding-bottom: calc(env(safe-area-inset-bottom) + var(--tabbar-height) + 96px); }

h1 { font-size: 1.75rem; margin: 0; letter-spacing: -0.01em; }
p { line-height: 1.45; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.positive { color: var(--positive); }
.negative { color: var(--negative); }
[hidden] { display: none !important; }

.icon { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.error {
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  border-radius: 10px;
  padding: 10px 12px;
  margin: 0;
}
.error p { margin: 0 0 8px; }

.notice {
  margin: 0 0 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}
.notice.warning { background: color-mix(in srgb, var(--negative) 14%, transparent); }

.empty { text-align: center; margin: 40px 0; }
.empty p { margin: 0 0 8px; }
.empty button { margin-top: 12px; }

/* Buttons */
button {
  font: inherit;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button.small { min-height: 36px; padding: 0 14px; font-size: 0.9rem; }
button:disabled { opacity: 0.6; }
button.inline-link { border: none; background: none; padding: 0; min-height: 0; color: var(--accent); font-size: inherit; font-weight: 600; }
button.danger-link { border: none; background: none; color: var(--danger); justify-self: center; }
button.danger { color: var(--danger); font-weight: 600; }
.icon-button {
  width: 44px;
  height: 44px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}
a.link { color: var(--accent); text-decoration: none; font-weight: 600; display: inline-flex; align-items: center; min-height: 44px; }

/* Page header */
.page-header { margin-bottom: 12px; }
.page-title-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 44px; }
.page-title-row h1 { overflow-wrap: anywhere; }
a.back { color: var(--accent); text-decoration: none; font-weight: 600; display: inline-flex; align-items: center; min-height: 36px; }
.subtitle { margin: -6px 0 12px; }
.header-actions { display: inline-flex; align-items: center; gap: 4px; margin-right: -10px; }

/* Login */
.login {
  min-height: 70dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 24px;
  text-align: center;
}
.login .brand { font-size: 2.25rem; font-weight: 700; color: var(--accent); margin: 0; }
.google-button { display: flex; justify-content: center; min-height: 44px; }
.dev-login { display: grid; gap: 8px; }
.dev-login .label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; }

/* Lists of rows */
.list {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.list li + li { border-top: 1px solid var(--border); }
.row {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 60px;
  margin: 0;
  padding: 12px 14px;
  border: none;
  border-radius: 0;
  background: none;
  color: inherit;
  text-align: left;
  text-decoration: none;
}
.row.stacked { flex-direction: column; align-items: stretch; gap: 2px; }
a.row:active, button.row:active { background: var(--pressed); }
.main { display: flex; flex-direction: column; min-width: 0; flex: 1; }
.title { font-weight: 600; overflow-wrap: anywhere; }
.detail { font-size: 0.85rem; }
.row-end { margin-left: auto; text-align: right; font-size: 0.9rem; flex-shrink: 0; }
.section-heading {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 24px 4px 8px;
}

.avatar {
  border-radius: 50%;
  flex-shrink: 0;
  object-fit: cover;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  background: hsl(var(--hue, 160) 45% var(--avatar-l));
  color: hsl(var(--hue, 160) 45% var(--avatar-text-l));
}
.group-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: hsl(var(--hue) 45% var(--avatar-l));
  color: hsl(var(--hue) 45% var(--avatar-text-l));
}

.search {
  margin-bottom: 12px;
  -webkit-appearance: none;
  appearance: none;
  border-radius: 999px !important;
  padding-left: 16px !important;
}

/* Expenses */
.expense .date { display: flex; flex-direction: column; align-items: center; line-height: 1.1; width: 32px; flex-shrink: 0; }
.date-month { font-size: 0.7rem; text-transform: uppercase; }
.date-day { font-size: 1.2rem; color: var(--text); }
.share { display: flex; flex-direction: column; align-items: flex-end; text-align: right; flex-shrink: 0; margin-left: auto; }
.share-label { font-size: 0.75rem; }
.share-amount { font-weight: 600; font-variant-numeric: tabular-nums; }

/* Group balance card */
.balance { text-align: center; padding: 24px 20px; }
.balance-label { margin: 0; font-size: 1rem; }
.balance-amount { margin: 4px 0 0; font-size: 2.5rem; font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.balance .settle { margin-top: 16px; min-width: 160px; font-weight: 600; }
.transfers { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 4px; }
.transfers.muted { font-size: 0.9rem; }
.settlement-summary .transfers { margin: 0 0 8px; font-size: 1.15rem; font-weight: 600; }
.settlement-summary p { margin: 0; }

.fab {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(env(safe-area-inset-bottom) + var(--tabbar-height) + 16px);
  min-height: 52px;
  padding: 0 28px;
  font-size: 1.05rem;
  box-shadow: 0 6px 20px rgb(0 0 0 / 0.18);
  z-index: 5;
}

/* Activity */
.feed-item { align-items: flex-start; }
.feed-text { line-height: 1.35; }
.feed-impact { font-size: 0.9rem; font-weight: 600; margin-top: 2px; }
.feed .detail { margin-top: 2px; }
.load-more { display: block; margin: 16px auto 0; }

/* Account */
.profile { display: flex; align-items: center; gap: 16px; margin-bottom: 12px; }
.profile p { margin: 0; }
.profile-name { font-size: 1.3rem; font-weight: 700; }
.emails { list-style: none; margin: 2px 0 0; padding: 0; overflow-wrap: anywhere; }
.account-form { display: grid; gap: 12px; margin-bottom: 24px; }
.account-form .notice { margin: 0; }
.hint { margin: 0; font-size: 0.85rem; }
.sign-out { width: 100%; color: var(--danger); font-weight: 600; }

/* Bottom tab bar */
.tabbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  height: calc(var(--tabbar-height) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
}
.tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.7rem;
  font-weight: 600;
}
.tab.active { color: var(--accent); }
.tab:active { background: var(--pressed); }

/* Bottom sheet dialog */
dialog.sheet {
  width: 100%;
  max-width: 560px;
  max-height: 92dvh;
  margin: auto auto 0;
  padding: 0;
  border: none;
  border-radius: 20px 20px 0 0;
  background: var(--surface);
  color: var(--text);
  overflow: auto;
}
dialog.sheet::backdrop { background: var(--backdrop); }
@media (min-width: 600px) {
  dialog.sheet { margin: auto; border-radius: 20px; }
}
.sheet form, .sheet .sheet-body {
  display: grid;
  gap: 16px;
  padding: 20px 16px calc(env(safe-area-inset-bottom) + 20px);
}
.sheet h2 { margin: 0; font-size: 1.25rem; }
.sheet h2:focus { outline: none; }
.sheet p { margin: 0; }

.field { display: grid; gap: 6px; }
.field label, .participants legend { font-size: 0.85rem; font-weight: 600; color: var(--muted); }
.field-error { margin: 0; color: var(--danger); font-size: 0.85rem; }

/* 16px+ stops iOS Safari zooming in when a field is focused. */
input, select {
  font: inherit;
  font-size: 16px;
  width: 100%;
  min-height: 48px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
input[type="date"] { -webkit-appearance: none; appearance: none; display: flex; align-items: center; }
input[type="checkbox"] { width: 22px; min-height: 22px; height: 22px; margin: 0; accent-color: var(--accent); flex-shrink: 0; }

.participants { border: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.participants legend { padding: 0; margin-bottom: 6px; }
.check { display: flex; align-items: center; gap: 12px; min-height: 44px; }

.amount-input { position: relative; }
.amount-input span {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}
.amount-input input { padding-left: 26px; font-size: 1.25rem; font-variant-numeric: tabular-nums; }

.preview { margin: -4px 0 0; min-height: 1.45em; font-weight: 600; }
.lookup { min-height: 1.45em; margin-top: -8px !important; }
.settle-question { font-size: 1.15rem; font-weight: 600; }
.payments { margin: 0; padding-left: 20px; display: grid; gap: 4px; font-weight: 600; }
.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.actions.single { grid-template-columns: 1fr; }

/* Group settings */
.settings-form, .danger-zone { display: grid; gap: 14px; margin-bottom: 8px; }
.settings-form .notice, .danger-zone p { margin: 0; }
.list + .hint, .list + .error { margin-top: 8px; }

/* Percentage and exact splits: name, share, then a narrow box per person */
.split-values { gap: 0; }
.split-row { display: flex; align-items: center; gap: 10px; min-height: 52px; }
.split-name { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.split-share { font-size: 0.9rem; font-variant-numeric: tabular-nums; }
.split-input { position: relative; width: 112px; flex-shrink: 0; }
.split-input input { text-align: right; font-variant-numeric: tabular-nums; }
.split-input span { position: absolute; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; }
.split-input.exact span { left: 12px; }
.split-input.exact input { padding-left: 24px; }
.split-input.percent span { right: 12px; }
.split-input.percent input { padding-right: 28px; }
.split-total { margin: 6px 0 0; font-size: 0.9rem; font-weight: 600; color: var(--negative); }
.split-total.done { color: var(--positive); }