:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #6b7688;
  --border: #e3e8ef;
  --primary: #2f6df6;
  --primary-dark: #2357cf;
  --green: #1a9d5a;
  --green-bg: #e7f7ee;
  --red: #d64545;
  --amber: #b7791f;
  --shadow: 0 1px 3px rgba(16, 24, 40, .08), 0 1px 2px rgba(16, 24, 40, .06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1420;
    --card: #1a2130;
    --text: #e7ecf3;
    --muted: #93a0b4;
    --border: #2a3446;
    --green-bg: #12301f;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

.app-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px 0;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.app-header h1 { margin: 0; font-size: 22px; }
.event-bar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.event-select { min-width: 180px; max-width: 320px; font-weight: 600; }
.btn:disabled { opacity: .4; cursor: not-allowed; }

.tabs { display: flex; gap: 6px; }
.tab {
  border: none;
  background: transparent;
  padding: 10px 16px;
  font-size: 15px;
  cursor: pointer;
  color: var(--muted);
  border-bottom: 3px solid transparent;
  border-radius: 8px 8px 0 0;
}
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.tab:hover { background: var(--bg); }

main { max-width: 860px; margin: 0 auto; padding: 20px 16px 60px; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.card h2 { margin: 0 0 14px; font-size: 17px; }

.form-grid .row {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}
.row label { flex: 1; display: flex; flex-direction: column; font-size: 13px; color: var(--muted); gap: 5px; }
.row-actions { align-items: flex-end; }

input, select {
  font-size: 15px;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--bg);
  color: var(--text);
  width: 100%;
}
input:focus, select:focus { outline: 2px solid var(--primary); border-color: var(--primary); }

.checkbox { flex-direction: row !important; align-items: center; color: var(--text) !important; font-size: 15px !important; }
.checkbox input { width: auto; }

.btn {
  border: none;
  border-radius: 9px;
  padding: 10px 18px;
  font-size: 15px;
  cursor: pointer;
  background: var(--bg);
  color: var(--text);
  white-space: nowrap;
}
.btn.primary { background: var(--primary); color: #fff; font-weight: 600; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.small { padding: 6px 10px; font-size: 13px; }
.btn.danger { color: var(--red); }
.btn:hover { filter: brightness(.97); }

/* ---- summary ---- */
.summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 20px; }
.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  box-shadow: var(--shadow);
}
.stat .value { font-size: 24px; font-weight: 700; }
.stat .label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.breakdown { grid-column: 1 / -1; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px; box-shadow: var(--shadow); }
.breakdown h3 { margin: 0 0 8px; font-size: 13px; color: var(--muted); text-transform: uppercase; }
.breakdown-row { display: flex; justify-content: space-between; padding: 4px 0; border-bottom: 1px dashed var(--border); font-size: 14px; }
.breakdown-row:last-child { border-bottom: none; }
.breakdown-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

/* ---- list ---- */
.list-controls { display: flex; gap: 10px; margin-bottom: 14px; }
.list-controls .search { flex: 1; }
.list-controls select { flex: 0 0 160px; }

.list { display: flex; flex-direction: column; gap: 10px; }

.item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 12px;
}
.item.done { opacity: .62; }
.item.done .item-name { text-decoration: line-through; }

.item .check { width: 22px; height: 22px; cursor: pointer; flex: 0 0 auto; }

.item-main { flex: 1; min-width: 0; }
.item-name { font-weight: 600; font-size: 15px; }
.item-meta { font-size: 13px; color: var(--muted); margin-top: 3px; display: flex; flex-wrap: wrap; gap: 6px 12px; }
.tag { display: inline-flex; align-items: center; gap: 4px; }
.tag.family { color: var(--primary); }
.tag.amount { color: var(--green); font-weight: 600; }
.tag.receipt { color: var(--amber); }

.item-actions { display: flex; gap: 6px; flex: 0 0 auto; }

.cat-group { margin-bottom: 6px; }
.cat-title { font-size: 13px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; margin: 14px 0 8px; }

.empty { text-align: center; color: var(--muted); padding: 40px 20px; }
.empty p { margin: 6px 0; }
.empty .btn { margin-top: 14px; }

.hint { font-size: 13px; color: var(--muted); margin: -6px 0 12px; }

/* учасники — чіпи */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 999px; padding: 6px 8px 6px 12px; font-size: 14px;
}
.chip-x {
  border: none; background: var(--border); color: var(--text);
  width: 20px; height: 20px; border-radius: 50%; cursor: pointer;
  font-size: 15px; line-height: 1; display: flex; align-items: center; justify-content: center;
}
.chip-x:hover { background: var(--red); color: #fff; }

.inline-form { display: flex; gap: 8px; margin-top: 4px; }
.inline-form input { flex: 1; }

.checkbox-label { justify-content: flex-end; }

/* хто я */
.me-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.me-label { display: flex; align-items: center; gap: 8px; font-size: 16px; font-weight: 600; color: var(--text); }
.me-label select { width: auto; min-width: 160px; font-size: 15px; font-weight: 600; }
.chip.me { border-color: var(--primary); background: rgba(47,109,246,.1); font-weight: 600; }

/* швидке додавання */
.quick-add { display: flex; gap: 10px; align-items: center; padding: 14px 16px; }
.quick-add input { flex: 1; font-size: 16px; }

/* заголовки списків */
.list-heading { font-size: 16px; margin: 22px 4px 10px; display: flex; align-items: center; gap: 8px; }
.list-heading .count { color: var(--muted); font-weight: 400; font-size: 14px; }
.bought-heading { color: var(--muted); }
.empty.small { padding: 16px; font-size: 13px; }

/* кнопка/поле розтрат */
.amount-btn {
  border: 1px solid var(--border); background: var(--bg); color: var(--muted);
  border-radius: 8px; padding: 6px 10px; font-size: 13px; cursor: pointer; white-space: nowrap;
}
.amount-btn.has { color: var(--green); border-color: var(--green); font-weight: 600; background: var(--green-bg); }
.amount-btn:hover { filter: brightness(.97); }
.amount-edit { display: inline-flex; gap: 4px; align-items: center; }
.amount-edit input { width: 110px; padding: 6px 8px; font-size: 14px; }

/* форма окремих витрат */
.expense-form { padding: 14px 16px; }
.expense-form .row { margin-bottom: 10px; }
.expense-form .row-actions { margin-bottom: 0; }
.stat-sub { font-size: 11px; color: var(--muted); margin-top: 4px; }
.breakdown-row .sub { display: block; font-weight: 400; color: var(--muted); font-size: 11px; }

/* баланси */
.bd-amount { display: inline-flex; gap: 8px; align-items: baseline; }
.bal { font-size: 12px; font-weight: 700; padding: 1px 6px; border-radius: 6px; }
.bal.pos { color: var(--green); background: var(--green-bg); }
.bal.neg { color: var(--red); background: rgba(214,69,69,.12); }
.tag.buyer { color: var(--primary); font-weight: 600; }
.tag.muted, .muted { color: var(--muted); }
.legend { font-size: 12px; color: var(--muted); margin: 10px 0 0; }
.breakdown small { font-weight: 400; text-transform: none; letter-spacing: 0; }

/* модалка */
.modal {
  position: fixed; inset: 0; background: rgba(16,24,40,.5);
  display: flex; align-items: center; justify-content: center; z-index: 50; padding: 16px;
}
.modal-card {
  background: var(--card); border-radius: 16px; padding: 22px; width: 100%; max-width: 420px;
  box-shadow: 0 10px 40px rgba(0,0,0,.25);
}
.modal-card h2 { margin: 0 0 16px; }
.modal-card label { display: flex; flex-direction: column; gap: 5px; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 8px; }

@media (max-width: 620px) {
  .form-grid .row { flex-direction: column; }
  .breakdown-cols { grid-template-columns: 1fr; }
  .list-controls { flex-direction: column; }
  .list-controls select { flex: 1; }
}