/* ===== CSS Variables (Light Theme) ===== */
:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-alt: #f9f9f9;
  --border: #e0e0e0;
  --text: #333333;
  --text-muted: #555555;
  --text-placeholder: #bbbbbb;
  --primary: #3498db;
  --primary-dark: #2980b9;
  --primary-shadow: rgba(52, 152, 219, 0.35);
  --danger: #e74c3c;
  --danger-dark: #c0392b;
  --success: #2ecc71;
  --warning: #e67e22;
  --shadow: 0 10px 25px rgba(0,0,0,0.08);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --radius: 12px;
  --radius-sm: 8px;
}

/* ===== Dark Theme ===== */
[data-theme="dark"] {
  --bg: #1a1d23;
  --surface: #252830;
  --surface-alt: #2e3240;
  --border: #3a3f50;
  --text: #e8eaf0;
  --text-muted: #9aa0b4;
  --text-placeholder: #5a6070;
  --primary: #5dade2;
  --primary-dark: #3498db;
  --primary-shadow: rgba(93, 173, 226, 0.3);
  --danger: #e74c3c;
  --danger-dark: #c0392b;
  --success: #2ecc71;
  --warning: #e67e22;
  --shadow: 0 10px 25px rgba(0,0,0,0.3);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
}

/* ===== Reset ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', sans-serif;
}

/* ===== Body ===== */
body {
  background: var(--bg);
  display: flex;
  justify-content: center;
  padding: 20px;
  min-height: 100vh;
  transition: background 0.3s;
  color: var(--text);
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ===== Header Row ===== */
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px 20px;
  box-shadow: var(--shadow);
}

h1 {
  font-size: 20px;
  color: var(--text);
}

/* ===== Theme Toggle ===== */
.btn-icon {
  background: var(--surface-alt);
  border: 1.5px solid var(--border);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.2s;
}

.btn-icon:hover {
  transform: rotate(20deg);
  background: var(--border);
}

/* ===== Balance Card ===== */
#balance-card {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow);
  color: white;
}

#balance-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.85;
}

#balance {
  font-size: 28px;
  font-weight: 800;
  margin: 6px 0 4px;
}

#balance-card.over-limit {
  background: linear-gradient(135deg, #e74c3c, #c0392b);
}

#limit-warning {
  font-size: 13px;
  font-weight: 600;
  background: rgba(255,255,255,0.2);
  border-radius: 20px;
  padding: 4px 12px;
  display: inline-block;
  margin-top: 4px;
}

/* ===== Section Cards ===== */
.section-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.section-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

/* ===== Limit Row ===== */
.limit-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.limit-row input {
  flex: 1;
}

.limit-info {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ===== Category Chips ===== */
#category-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.chip {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 10px;
  font-size: 12px;
  color: var(--text);
}

.chip .chip-delete {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--danger);
  font-size: 13px;
  padding: 0 0 0 4px;
  line-height: 1;
}

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

/* ===== Form ===== */
form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.input-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

form input,
form select,
.limit-row input,
#new-category-name,
#new-category-emoji,
#spending-limit {
  padding: 10px 13px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  font-size: 14px;
  background: var(--surface-alt);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}

form input:focus,
form select:focus,
.limit-row input:focus,
#new-category-name:focus,
#new-category-emoji:focus,
#spending-limit:focus {
  border-color: var(--primary);
  background: var(--surface);
  outline: none;
  box-shadow: 0 0 0 3px var(--primary-shadow);
}

form input::placeholder,
.limit-row input::placeholder,
#new-category-name::placeholder,
#new-category-emoji::placeholder,
#spending-limit::placeholder {
  color: var(--text-placeholder);
}

/* ===== Buttons ===== */
.btn-submit {
  padding: 12px;
  border: none;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 4px 12px var(--primary-shadow);
  margin-top: 4px;
}

.btn-submit:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px var(--primary-shadow);
}

.btn-submit:active {
  transform: translateY(0);
}

.btn-secondary {
  padding: 9px 14px;
  border: 1.5px solid var(--primary);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--primary);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
}

.btn-secondary:hover {
  background: var(--primary);
  color: white;
}

.btn-tiny {
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-alt);
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-tiny:hover {
  background: var(--border);
}

/* ===== Controls Row ===== */
.controls-row {
  display: flex;
  gap: 10px;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1;
  min-width: 140px;
}

.control-group label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.control-group input[type="month"],
.control-group select {
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  font-size: 13px;
  background: var(--surface-alt);
  color: var(--text);
  cursor: pointer;
}

.control-group input[type="month"]:focus,
.control-group select:focus {
  border-color: var(--primary);
  outline: none;
}

/* ===== Monthly Summary ===== */
#monthly-summary .summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.summary-item {
  background: var(--surface-alt);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  border: 1px solid var(--border);
}

.summary-item .s-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.summary-item .s-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-top: 2px;
}

.summary-cat-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.summary-cat-row:last-child {
  border-bottom: none;
}

/* ===== Transaction List ===== */
#transaction-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

#transaction-list li {
  background: var(--surface);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  border-left-width: 5px;
  animation: fadeIn 0.3s ease;
  color: var(--text);
}

#transaction-list li.over-limit-item {
  background: #fff5f5;
  border-color: var(--danger);
}

[data-theme="dark"] #transaction-list li.over-limit-item {
  background: #2d1a1a;
}

.tx-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tx-name {
  font-weight: 600;
}

.tx-meta {
  font-size: 11px;
  color: var(--text-muted);
}

.tx-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tx-amount {
  font-weight: 700;
  font-size: 15px;
  color: var(--danger);
}

.tx-amount.over {
  color: var(--danger);
}

/* ===== Delete Button ===== */
.delete-btn {
  background: var(--danger);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 5px 9px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s;
}

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

/* ===== Category border colors (dynamic via inline style) ===== */

/* ===== Chart ===== */
.chart-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

canvas {
  width: 100% !important;
  max-height: 250px;
}

/* ===== Utility ===== */
.hidden {
  display: none !important;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 10px;
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
  .container {
    gap: 10px;
  }
  .controls-row {
    flex-direction: column;
  }
}