/* ── Reset & base ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  overflow-x: hidden;
}

:root {
  --bg:       #0f0f0f;
  --surface:  #1a1a1a;
  --border:   #2a2a2a;
  --text:     #e8e8e8;
  --muted:    #777;
  --accent:   #d4ff6f;  /* lime-ish highlight */
  --danger:   #ff5f5f;
  --radius:   8px;
  --font:     system-ui, -apple-system, sans-serif;
}

body {
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  min-height: 100dvh;
}

/* ── PIN screen ────────────────────────────────────────────────────────── */
.pin-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  gap: 1.5rem;
  padding: 2rem;
}

.pin-screen h1 {
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.pin-screen form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
  max-width: 240px;
}

.pin-screen label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ── Inputs & selects ──────────────────────────────────────────────────── */
input, select, textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  padding: 0.55rem 0.75rem;
  outline: none;
  transition: border-color 0.15s;
  appearance: none;
  -webkit-appearance: none;
}

input:focus, select:focus {
  border-color: var(--accent);
}

input.error {
  border-color: var(--danger);
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23777' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

.error-msg {
  font-size: 0.8rem;
  color: var(--danger);
}

/* ── Buttons ───────────────────────────────────────────────────────────── */
button, .btn-primary, .btn-outline, .btn-ghost {
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  transition: opacity 0.15s, background 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #111;
}

.btn-primary:hover { opacity: 0.85; }

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-ghost {
  background: transparent;
  color: var(--muted);
  padding: 0.4rem 0.6rem;
}

.btn-ghost:hover { color: var(--text); }

.btn-delete {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 1.1rem;
  padding: 0 0.3rem;
  line-height: 1;
  cursor: pointer;
}

.btn-delete:hover { color: var(--danger); }

button[type="submit"].full-width,
.full-width { width: 100%; }

/* ── App shell ─────────────────────────────────────────────────────────── */
.app {
  max-width: 600px;
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Header ────────────────────────────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

header h1 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  border-radius: 99px;
}

.badge.open   { background: #1f3a12; color: var(--accent); }
.badge.closed { background: #3a1212; color: var(--danger); }

/* ── Summary bar ───────────────────────────────────────────────────────── */
.summary-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
}

.summary-item {
  display: flex;
  flex-direction: column;
  min-width: 80px;
}

.summary-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.summary-value {
  font-size: 1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* ── Settle bar ────────────────────────────────────────────────────────── */
.settle-bar {
  display: flex;
  justify-content: flex-end;
}

/* ── Sections ──────────────────────────────────────────────────────────── */
.section {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.section h2 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.section h2 small {
  font-weight: 400;
  font-size: 0.75rem;
}

/* ── Expense form ──────────────────────────────────────────────────────── */
.expense-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-row label {
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-row label small {
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.72rem;
}

/* ── Transactions (settlement) ─────────────────────────────────────────── */
.transactions {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.transactions li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.t-from { font-weight: 700; }
.t-to   { font-weight: 700; }

.t-amount {
  margin-left: auto;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.all-even {
  color: var(--muted);
  font-style: italic;
}

/* ── Expense list ──────────────────────────────────────────────────────── */
.expense-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.expense-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.65rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.e-main {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  min-width: 0;
}

.e-who {
  font-weight: 700;
  white-space: nowrap;
}

.e-cat {
  font-size: 0.72rem;
  background: #222;
  border: 1px solid var(--border);
  padding: 0.1rem 0.45rem;
  border-radius: 99px;
  white-space: nowrap;
}

.e-note {
  color: var(--muted);
  font-size: 0.85rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 180px;
}

.e-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.e-amount {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.empty {
  color: var(--muted);
  font-style: italic;
}

/* ── Balance colors ────────────────────────────────────────────────────── */
.bal-pos { color: var(--accent); }
.bal-neg { color: var(--danger); }

/* ── Participant chips ─────────────────────────────────────────────────── */
.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.chip {
  cursor: pointer;
  user-select: none;
}

.chip input[type="checkbox"] {
  display: none;
  width: auto;
}

.chip span {
  display: inline-block;
  font-size: 0.8rem;
  padding: 0.25rem 0.65rem;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  white-space: nowrap;
}

.chip input[type="checkbox"]:checked + span {
  background: var(--accent);
  color: #111;
  border-color: var(--accent);
  font-weight: 600;
}

/* ── Participant subset tag ────────────────────────────────────────────── */
.e-parts {
  font-size: 0.72rem;
  color: var(--muted);
  font-style: italic;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 160px;
}