:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --fg: #1a1d21;
  --muted: #667085;
  --accent: #0f62fe;
  --err: #da1e28;
  --ok: #1a7f37;
  --warn: #9a6700;
  --border: #d5dce5;
}

* { box-sizing: border-box; }
html { font-size: 16px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.45;
}

.top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  flex-wrap: wrap;
}
.top h1 { font-size: 1.2rem; margin: 0; }
.sub { color: var(--muted); font-size: 0.9rem; }
.top select { flex: 1; min-width: 160px; }

main {
  padding: 0 1rem calc(2rem + env(safe-area-inset-bottom));
  max-width: 900px;
  margin: 0 auto;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 1rem;
}
.card h2 { font-size: 1.05rem; margin: 0 0 0.75rem; }
.card h3 { font-size: 0.95rem; margin: 0.75rem 0 0.5rem; }

.muted { color: var(--muted); }
.err { color: var(--err); font-weight: 600; }
.warn { color: var(--warn); }

/* inputs & buttons: 16px font avoids iOS zoom, 44px min tap targets */
input, select, textarea {
  font: inherit;
  font-size: 1rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 100%;
  min-height: 44px;
  background: #fff;
}
input.big, select.big { font-size: 1.35rem; }
textarea { min-height: 110px; font-family: ui-monospace, monospace; font-size: 0.85rem; }

button {
  font: inherit;
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--fg);
  min-height: 44px;
  cursor: pointer;
  white-space: nowrap;
}
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.danger { color: var(--err); }
button.block { width: 100%; }

label.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1 1 140px;
  font-size: 0.85rem;
  color: var(--muted);
  min-width: 0;
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: end;
}
.form-row .field { flex: 1 1 130px; }

/* MV form: inner card with grouped rows */
.mv-form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  padding: 1rem;
}
.mv-form .field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1 1 130px;
  font-size: 0.85rem;
  color: var(--muted);
  min-width: 0;
}
.mv-form .field.grow { flex: 1 1 100%; }
.mv-form .form-actions { justify-content: space-between; align-items: center; }
.btn-row { display: flex; gap: 0.5rem; }
.mv-card-actions { display: flex; justify-content: flex-end; gap: 0.5rem; }
.mv-card-actions button { min-height: 36px; padding: 0.35rem 0.7rem; font-size: 0.85rem; }
.check-inline { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.9rem; color: var(--fg); }
.check-inline input { width: 1.1rem; height: 1.1rem; min-height: 0; padding: 0; accent-color: var(--accent); }

/* multi-select for persons (Ctrl/⌘ for several) */
.person-multi {
  width: 100%;
  min-height: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  font: inherit;
  font-size: 0.95rem;
  padding: 0.3rem;
}
.person-multi option { padding: 0.3rem 0.4rem; }
.person-multi option:checked {
  background: var(--accent) linear-gradient(0deg, var(--accent), var(--accent));
  color: #fff;
}

/* Vorauszahlung: first row inherits the MV start date, extra rows carry one */
.adv-first { display: flex; align-items: center; gap: 0.5rem; }
.adv-first input { flex: 1; min-width: 0; }
.adv-first .unit-hint { font-size: 0.8rem; color: var(--muted); white-space: nowrap; }
.advance-row { display: flex; gap: 0.4rem; margin-top: 0.4rem; align-items: center; }
.advance-row input { min-height: 40px; }
.advance-row input[type=date] { flex: 1.3; min-width: 0; }
.advance-row input[type=number] { flex: 1; min-width: 0; }
.advance-row button { flex: none; }

/* tabs: horizontal scroll on small screens */
.tabs {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  padding: 0 0.75rem;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 5;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tabs button {
  border: none;
  background: transparent;
  border-bottom: 3px solid transparent;
  border-radius: 0;
  min-height: 48px;
  color: var(--muted);
  padding-inline: 0.6rem;
}
.tabs button.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

.list-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 0.45rem 0.4rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }
td.num, th.num { text-align: right; }
td .btn { min-height: 36px; padding-inline: 0.5rem; }

/* reading entry: the phone workhorse */
.reading-form { display: grid; gap: 0.6rem; margin-bottom: 0.75rem; }

/* readings chart (canvas sized in JS) */
.chart { margin: 0.25rem 0 0.75rem; }
.chart-canvas { display: block; }
.reading-form .value-input { font-size: 1.6rem; text-align: center; }
.reading-form .form-row button { flex: 1 1 140px; font-size: 1.05rem; }

.summary {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem 1.25rem;
  font-size: 0.95rem;
}
.summary .label { color: var(--muted); }
.summary .value { text-align: right; font-variant-numeric: tabular-nums; }
.balance-pos { color: var(--err); font-weight: 600; }
.balance-neg { color: var(--ok); font-weight: 600; }

.warnings { list-style: none; margin: 0.5rem 0 0; padding: 0.5rem 0 0; }
.warnings li { padding: 0.25rem 0; font-size: 0.85rem; }
.warnings li.blocked-line { color: var(--err); font-weight: 600; }

#toast {
  position: fixed;
  bottom: calc(1rem + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  background: #161b22;
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  z-index: 20;
  max-width: 92vw;
  font-size: 0.9rem;
}
#toast.error { background: var(--err); }

@media (min-width: 720px) {
  main { padding-top: 0.5rem; }
  .card { padding: 1.25rem; }
}