:root {
    --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
    --danger-gradient: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    --success-color: #10b981;
    --danger-color: #ef4444;
    --bg-color: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius: 12px;
}



* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Cairo', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    height: 100dvh; /* viewport height including mobile URL bars */
    overflow: hidden; /* Prevent body scroll */
    display: flex;
    justify-content: center;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 550px;
    margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

section {
  display: flex;
  flex-direction: column;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  padding: 24px;
  margin-bottom: 20px;
}

.hidden {
  display: none;
}

/* ... headers/inputs ... */
h2,
.input-group,
.stats-container,
.secondary-btn {
  /* No special flex needed */
}

.list-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 500px; /* Scrollable area */
  overflow-y: auto;
  padding-right: 5px;
  margin-top: 10px;
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
}

.list-item {
  background: #f9fafb;
  padding: 15px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: transform 0.1s;
}

.list-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.debtor-info h3 {
  margin: 0;
  font-size: 1.1rem;
}

.debtor-info p {
  margin: 5px 0 0;
  font-size: 0.9rem;
  color: #6b7280;
}

.balance {
  font-weight: 700;
  font-size: 1.2rem;
}

.balance.positive {
  color: var(--danger-color);
}

.balance.negative {
  color: var(--success-color);
}

.transaction-item {
  cursor: default;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.transaction-item:hover {
  transform: none;
}

.t-info {
  display: flex;
  flex-direction: column;
}

.t-date {
  font-size: 0.8rem;
  color: #9ca3af;
}

.t-note {
  font-size: 0.9rem;
}

.t-amount {
  font-weight: bold;
}

.t-amount.debt {
  color: var(--danger-color);
}

.t-amount.payment {
  color: var(--success-color);
}

/* New Statistics Styles */
.stats-container {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 25px;
  flex-wrap: wrap;
}

.stat-card {
  flex: 1;
  background: #f8fafc;
  padding: 15px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 100px;
}

.stat-card span {
  font-size: 0.85rem;
  color: #64748b;
  margin-bottom: 5px;
}

.stat-card strong {
  font-size: 1.2rem;
  display: block;
}

.stat-card small {
  font-size: 0.75rem;
  color: #94a3b8;
  margin-top: 5px;
}

.debt-stat strong {
  color: var(--danger-color);
}
.payment-stat strong {
  color: var(--success-color);
}
.balance-stat {
  background-color: #eef2ff;
  border-color: #c7d2fe;
}
.balance-stat strong {
  color: var(--primary-color);
}

/* Context Menu */
.context-menu {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1000;
  min-width: 250px;
  border: 1px solid var(--border-color);
}

.context-menu.hidden {
  display: none;
}

.context-menu button {
  width: 100%;
  padding: 12px;
  text-align: center;
}

.context-menu button.danger {
  background-color: var(--danger-color);
}

.context-menu button.danger:hover {
  background-color: #dc2626;
}

#cancel-context-btn {
  background-color: #9ca3af;
}

/* Prevent auto-zoom on mobile */
input,
select,
textarea {
  font-size: 16px !important;
}