/* =============================================
   CSS Variables — Light & Dark Theme
   ============================================= */
:root {
  --bg-page:        #f0f2f5;
  --bg-card:        #ffffff;
  --bg-header:      #4f46e5;
  --text-primary:   #1e1e2e;
  --text-secondary: #6b7280;
  --text-header:    #ffffff;
  --accent:         #4f46e5;
  --accent-hover:   #4338ca;
  --danger:         #ef4444;
  --danger-hover:   #dc2626;
  --highlight-bg:   #fef2f2;
  --highlight-border: #ef4444;
  --border:         #e5e7eb;
  --input-bg:       #f9fafb;
  --shadow:         0 2px 8px rgba(0,0,0,0.08);
  --radius:         12px;
  --transition:     0.25s ease;
}

[data-theme="dark"] {
  --bg-page:        #0f0f1a;
  --bg-card:        #1a1a2e;
  --bg-header:      #1a1a2e;
  --text-primary:   #e2e8f0;
  --text-secondary: #94a3b8;
  --text-header:    #e2e8f0;
  --accent:         #818cf8;
  --accent-hover:   #6366f1;
  --danger:         #f87171;
  --danger-hover:   #ef4444;
  --highlight-bg:   #2d1b1b;
  --highlight-border: #f87171;
  --border:         #2d2d44;
  --input-bg:       #0f0f1a;
  --shadow:         0 2px 8px rgba(0,0,0,0.4);
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
}

/* =============================================
   Layout
   ============================================= */
.app-container {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 0 2rem;
}

/* =============================================
   Header
   ============================================= */
.app-header {
  background: var(--bg-header);
  color: var(--text-header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: var(--shadow);
}

.app-header h1 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.3px;
}

.btn-icon {
  background: transparent;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  transition: transform var(--transition);
}

.btn-icon:hover { transform: scale(1.15); }

/* =============================================
   Balance Card
   ============================================= */
.balance-card {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: #fff;
  text-align: center;
  padding: 1.75rem 1.25rem;
  margin: 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.balance-label {
  font-size: 0.85rem;
  opacity: 0.85;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.4rem;
}

.balance-amount {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

/* =============================================
   Generic Card
   ============================================= */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 0 1rem 1rem;
  box-shadow: var(--shadow);
  transition: background var(--transition);
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

/* =============================================
   Form
   ============================================= */
.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 0.85rem;
}

.form-group label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group select {
  background: var(--input-bg);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  color: var(--text-primary);
  transition: border-color var(--transition), background var(--transition);
  outline: none;
}

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

.form-group input.invalid,
.form-group select.invalid {
  border-color: var(--danger);
}

.error-msg {
  font-size: 0.78rem;
  color: var(--danger);
  margin-top: 0.25rem;
  min-height: 1rem;
}

.btn-primary {
  width: 100%;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 0.25rem;
  transition: background var(--transition), transform 0.1s;
}

.btn-primary:hover  { background: var(--accent-hover); }
.btn-primary:active { transform: scale(0.98); }

/* =============================================
   Controls (Sort + Limit)
   ============================================= */
.controls-section {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.control-group {
  flex: 1;
  min-width: 130px;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.control-group label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.control-group select,
.control-group input {
  background: var(--input-bg);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  font-size: 0.88rem;
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}

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

/* =============================================
   Transaction List
   ============================================= */
.transaction-list {
  list-style: none;
  max-height: 320px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding-right: 2px; /* prevent scrollbar overlap */
}

/* Scrollbar styling */
.transaction-list::-webkit-scrollbar { width: 5px; }
.transaction-list::-webkit-scrollbar-track { background: transparent; }
.transaction-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.empty-state {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 1.5rem 0;
}

/* Individual transaction item */
.transaction-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--input-bg);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 0.65rem 0.85rem;
  transition: border-color var(--transition), background var(--transition);
  animation: slideIn 0.2s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Highlight items over spending limit */
.transaction-item.over-limit {
  background: var(--highlight-bg);
  border-color: var(--highlight-border);
}

.item-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  flex: 1;
  min-width: 0;
}

.item-name {
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.item-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.item-amount {
  font-size: 1rem;
  font-weight: 700;
  color: var(--danger);
  margin: 0 0.75rem;
  white-space: nowrap;
}

.btn-delete {
  background: transparent;
  border: 1.5px solid var(--danger);
  color: var(--danger);
  border-radius: 6px;
  padding: 0.25rem 0.55rem;
  font-size: 0.78rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  flex-shrink: 0;
}

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

/* =============================================
   Chart
   ============================================= */
.chart-wrapper {
  position: relative;
  max-width: 260px;
  height: 260px; /* diperlukan saat maintainAspectRatio: false */
  margin: 0 auto;
}

/* =============================================
   Hide native browser spin-buttons
   Chrome, Safari, Edge (WebKit)
   ============================================= */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  appearance: none;
  margin: 0;
}

/* Firefox */
input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

/* =============================================
   Custom Stepper Wrapper
   ============================================= */
.stepper-wrap {
  display: flex;
  align-items: stretch;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color var(--transition);
}

/* When the inner input is focused, highlight the whole wrapper */
.stepper-wrap:focus-within {
  border-color: var(--accent);
}

/* Input inside stepper — remove its own border since wrapper handles it */
.stepper-wrap input[type="number"] {
  flex: 1;
  border: none;
  border-radius: 0;
  background: var(--input-bg);
  color: var(--text-primary);
  font-size: 0.95rem;
  padding: 0.6rem 0.5rem;
  text-align: center;
  outline: none;
  transition: background var(--transition), color var(--transition);
  min-width: 0; /* prevent overflow on small screens */
}

/* Invalid state — highlight wrapper border */
.stepper-wrap.invalid {
  border-color: var(--danger);
}

/* + / − buttons */
.stepper-btn {
  background: var(--input-bg);
  border: none;
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 700;
  width: 2.4rem;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition), color var(--transition);
  /* Divider lines between button and input */
  border-right: 1.5px solid var(--border);
}

.stepper-btn:last-child {
  border-right: none;
  border-left: 1.5px solid var(--border);
}

.stepper-btn:hover {
  background: var(--accent);
  color: #fff;
}

.stepper-btn:active {
  opacity: 0.8;
}

/* =============================================
   Responsive tweaks for larger screens
   ============================================= */
@media (min-width: 520px) {
  .app-container { padding-bottom: 3rem; }
}