:root {
  --primary: #5bc5a7; /* Splitwise Green-ish */
  --primary-hover: #45a089;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg: #f3f4f6;
  --card: #ffffff;
  --text: #333333;
  --text-sec: #6b7280;
  --border: #e5e7eb;
  --input-bg: #ffffff;
}

body.dark-mode {
  --bg: #111827;
  --card: #1f2937;
  --text: #f9fafb;
  --text-sec: #9ca3af;
  --border: #374151;
  --input-bg: #374151;
  --primary: #5bc5a7;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 20px;
  transition:
    background-color 0.3s,
    color 0.3s;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
  flex-wrap: wrap;
  gap: 10px;
}
h1 {
  margin: 0;
  color: var(--primary);
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}
.theme-toggle {
  background: none;
  border: 2px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 20px;
  cursor: pointer;
  white-space: nowrap;
}

/* Cards */
.card {
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  padding: 25px;
  margin-bottom: 25px;
  border: 1px solid var(--border);
}
h2 {
  margin-top: 0;
  font-size: 1.25rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
  margin-bottom: 20px;
  color: var(--text);
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
@media (max-width: 900px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* Inputs & Controls */
label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.9rem;
  color: var(--text);
}
input,
select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-sizing: border-box;
  margin-bottom: 15px;
  background: var(--input-bg);
  color: var(--text);
  font-size: 0.95rem;
}

.btn {
  padding: 10px 15px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  color: white;
  transition: 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.btn-primary {
  background: var(--primary);
  width: 100%;
}
.btn-primary:hover {
  background: var(--primary-hover);
}
.btn-secondary {
  background: var(--text-sec);
}
.btn-success {
  background: var(--success);
}
.btn-danger {
  background: var(--danger);
}
.btn-warning {
  background: var(--warning);
  color: #fff;
}
.btn-share {
  background: #8b5cf6;
}
.btn-sm {
  font-size: 0.85rem;
  padding: 8px 14px;
  width: auto;
}
.toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 0;
  align-items: center;
}

/* Dashboard specific */
.group-card {
  cursor: pointer;
  transition:
    transform 0.2s,
    box-shadow 0.2s;
  border-left: 5px solid var(--primary);
  position: relative;
}
.group-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}
.group-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 5px;
}
.group-title {
  font-size: 1.2rem;
  font-weight: bold;
}
.group-stat {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-sec);
  margin-top: 5px;
}
.new-group-card {
  border-left: 5px solid var(--text-sec);
  border-style: dashed;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
}
.nav-back {
  margin-right: 10px;
  font-size: 1.2rem;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

/* Context Menu */
.menu-btn {
  cursor: pointer;
  padding: 0 8px;
  font-weight: bold;
  font-size: 1.2rem;
  color: var(--text-sec);
  border-radius: 4px;
  line-height: 1;
}
.menu-btn:hover {
  background-color: rgba(0, 0, 0, 0.05);
  color: var(--text);
}
.context-menu {
  position: absolute;
  top: 40px;
  right: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  border-radius: 8px;
  z-index: 100;
  min-width: 140px;
  overflow: hidden;
  animation: fadeIn 0.1s ease-out;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.context-menu-item {
  padding: 10px 12px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text);
  transition: background 0.1s;
  display: flex;
  align-items: center;
  gap: 8px;
}
.context-menu-item:hover {
  background: var(--bg);
}
.context-menu-item.danger {
  color: var(--danger);
}
.context-menu-item.danger:hover {
  background: #fee2e2;
}

.hidden {
  display: none !important;
}

/* Other components (Badge, Table, etc.) */
.cat-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
}
.chart-toggles {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 15px;
}
.chart-toggle-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-sec);
  padding: 5px 15px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.85rem;
}
.chart-toggle-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}
.split-toggle {
  display: flex;
  background: var(--bg);
  padding: 4px;
  border-radius: 8px;
  margin-bottom: 15px;
}
.split-option {
  flex: 1;
  text-align: center;
  padding: 8px;
  cursor: pointer;
  border-radius: 6px;
  font-size: 0.9rem;
}
.split-option.active {
  background: var(--primary);
  color: white;
  font-weight: bold;
}
.participant-list {
  max-height: 250px;
  overflow-y: auto;
  background: var(--bg);
  padding: 10px;
  border-radius: 8px;
}
.participant-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}
.participant-row:last-child {
  border-bottom: none;
}
.unequal-input {
  width: 80px;
  margin: 0;
  padding: 5px;
  text-align: right;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
th {
  text-align: left;
  background: var(--bg);
  padding: 12px;
  color: var(--text-sec);
  white-space: nowrap;
}
td {
  padding: 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
@media (max-width: 600px) {
  body {
    padding: 10px;
  }
  .card {
    padding: 15px;
    margin-bottom: 15px;
  }
  h1 {
    font-size: 1.5rem;
  }
  .toolbar {
    gap: 8px;
    justify-content: center;
  }
  .btn-sm {
    flex: 1;
    font-size: 0.8rem;
    padding: 6px 10px;
    min-width: 80px;
  }
  th,
  td {
    padding: 8px 6px;
    font-size: 0.8rem;
  }
  .cat-badge {
    padding: 2px 5px;
  }
}
.settlement-item {
  display: flex;
  justify-content: space-between;
  padding: 12px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--success);
  color: var(--success);
  border-radius: 8px;
  margin-bottom: 8px;
  font-weight: 500;
}
body.dark-mode .settlement-item {
  background: rgba(16, 185, 129, 0.2);
}
.badge {
  background: var(--primary);
  color: white;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.8rem;
  margin-right: 5px;
}