:root {
  --sidebar-width: 256px;
  --header-height: 64px;
  --brand-50: #eef2ff;
  --brand-100: #e0e7ff;
  --brand-200: #c7d2fe;
  --brand-300: #a5b4fc;
  --brand-400: #818cf8;
  --brand-500: #6366f1;
  --brand-600: #4f46e5;
  --brand-700: #4338ca;
  --brand-800: #3730a3;
  --brand-900: #312e81;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif; }

#app.hidden, #auth-container.hidden { display: none !important; }

/* ============================
   TAILWIND UTILITY CLASSES
   ============================ */

/* --- Display --- */
.hidden { display: none; }
.block { display: block; }
.flex { display: flex; }
.inline-block { display: inline-block; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

/* --- Flexbox --- */
.flex-col { flex-direction: column; }
.flex-1 { flex: 1 1 0%; }
.flex-shrink-0 { flex-shrink: 0; }
.flex-wrap { flex-wrap: wrap; }
.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

/* --- Grid --- */
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.col-span-full { grid-column: 1 / -1; }

/* --- Gap --- */
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }

/* --- Spacing: Padding --- */
.p-1 { padding: 0.25rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.px-1 { padding-left: 0.25rem; padding-right: 0.25rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-5 { padding-left: 1.25rem; padding-right: 1.25rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.py-16 { padding-top: 4rem; padding-bottom: 4rem; }
.pt-4 { padding-top: 1rem; }
.pb-4, .pb-0 { padding-bottom: 0; }

/* --- Spacing: Margin --- */
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.ml-2 { margin-left: 0.5rem; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }

/* --- Space Between --- */
.space-y-1 > * + * { margin-top: 0.25rem; }
.space-y-2 > * + * { margin-top: 0.5rem; }
.space-y-3 > * + * { margin-top: 0.75rem; }
.space-y-4 > * + * { margin-top: 1rem; }
.space-y-6 > * + * { margin-top: 1.5rem; }

/* --- Width --- */
.w-5 { width: 1.25rem; }
.w-8 { width: 2rem; }
.w-10 { width: 2.5rem; }
.w-12 { width: 3rem; }
.w-14 { width: 3.5rem; }
.w-16 { width: 4rem; }
.w-64 { width: 16rem; }
.w-full { width: 100%; }

/* --- Height --- */
.h-4 { height: 1rem; }
.h-5 { height: 1.25rem; }
.h-8 { height: 2rem; }
.h-10 { height: 2.5rem; }
.h-12 { height: 3rem; }
.h-16 { height: 4rem; }
.h-screen { height: 100vh; }
.min-h-screen { min-height: 100vh; }
.min-w-0 { min-width: 0; }
.max-w-md { max-width: 28rem; }
.max-w-2xl { max-width: 42rem; }
.max-w-\[150px\] { max-width: 150px; }

/* --- Text Size --- */
.text-xs { font-size: 0.75rem; line-height: 1rem; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }
.text-lg { font-size: 1.125rem; line-height: 1.75rem; }
.text-xl { font-size: 1.25rem; line-height: 1.75rem; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }

/* --- Font Weight --- */
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

/* --- Text Alignment & Decoration --- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.uppercase { text-transform: uppercase; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* --- Letter Spacing --- */
.tracking-tight { letter-spacing: -0.025em; }
.tracking-wide { letter-spacing: 0.025em; }

/* --- Line Height --- */
.leading-none { line-height: 1; }

/* --- Colors: Text --- */
.text-white { color: #fff; }
.text-gray-300 { color: #d1d5db; }
.text-gray-400 { color: #9ca3af; }
.text-gray-500 { color: #6b7280; }
.text-gray-600 { color: #4b5563; }
.text-gray-700 { color: #374151; }
.text-gray-900 { color: #111827; }
.text-red-500 { color: #ef4444; }
.text-red-600 { color: #dc2626; }
.text-red-700 { color: #b91c1c; }
.text-green-600 { color: #16a34a; }
.text-amber-600 { color: #d97706; }
.text-brand-300 { color: var(--brand-300); }
.text-brand-600 { color: var(--brand-600); }
.text-brand-700 { color: var(--brand-700); }

/* --- Colors: Background --- */
.bg-white { background-color: #fff; }
.bg-gray-50 { background-color: #f9fafb; }
.bg-slate-800 { background-color: #1e293b; }
.bg-slate-900 { background-color: #0f172a; }
.bg-red-50 { background-color: #fef2f2; }
.bg-red-100 { background-color: #fee2e2; }
.bg-green-50 { background-color: #f0fdf4; }
.bg-green-100 { background-color: #dcfce7; }
.bg-amber-50 { background-color: #fffbeb; }
.bg-brand-50 { background-color: var(--brand-50); }
.bg-brand-100 { background-color: var(--brand-100); }
.bg-brand-500\/20 { background-color: rgba(99, 102, 241, 0.2); }
.bg-brand-600 { background-color: var(--brand-600); }
.bg-red-600 { background-color: #dc2626; }

/* --- Borders --- */
.border { border-width: 1px; border-style: solid; }
.border-b { border-bottom-width: 1px; border-bottom-style: solid; }
.border-t { border-top-width: 1px; border-top-style: solid; }
.border-gray-50 { border-color: #f9fafb; }
.border-gray-100 { border-color: #f3f4f6; }
.border-gray-200 { border-color: #e5e7eb; }
.border-red-200 { border-color: #fecaca; }
.border-slate-700\/50 { border-color: rgba(51, 65, 85, 0.5); }
.border-transparent { border-color: transparent; }
.last\:border-0:last-child { border-bottom: 0; }

/* --- Border Radius --- */
.rounded { border-radius: 0.25rem; }
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-full { border-radius: 9999px; }

/* --- Shadows --- */
.shadow { box-shadow: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1); }
.shadow-md { box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1); }
.hover\:shadow-md:hover { box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1); }

/* --- Overflow --- */
.overflow-hidden { overflow: hidden; }
.overflow-y-auto { overflow-y: auto; }
.overflow-x-auto { overflow-x: auto; }

/* --- Position --- */
.fixed { position: fixed; }
.relative { position: relative; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.top-4 { top: 1rem; }
.right-4 { right: 1rem; }
.z-50 { z-index: 50; }

/* --- Cursor --- */
.cursor-pointer { cursor: pointer; }

/* --- Pointer Events --- */
.pointer-events-none { pointer-events: none; }

/* --- Transitions --- */
.transition-colors { transition-property: color, background-color, border-color; transition-timing-function: cubic-bezier(0.4,0,0.2,1); transition-duration: 150ms; }
.transition-shadow { transition-property: box-shadow; transition-timing-function: cubic-bezier(0.4,0,0.2,1); transition-duration: 150ms; }
.transition-opacity { transition-property: opacity; transition-timing-function: cubic-bezier(0.4,0,0.2,1); transition-duration: 150ms; }
.transition-all { transition-property: all; transition-timing-function: cubic-bezier(0.4,0,0.2,1); transition-duration: 150ms; }

/* --- Opacity --- */
.opacity-0 { opacity: 0; }
.opacity-25 { opacity: 0.25; }
.opacity-60 { opacity: 0.6; }
.opacity-75 { opacity: 0.75; }

/* --- Antialiasing --- */
.antialiased { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

/* --- Animate --- */
@keyframes spin { to { transform: rotate(360deg); } }
.animate-spin { animation: spin 1s linear infinite; }

/* --- Group Hover --- */
.group:hover .group-hover\:opacity-100 { opacity: 1; }

/* --- Hover Variants --- */
.hover\:bg-slate-800:hover { background-color: #1e293b; }
.hover\:bg-gray-50:hover { background-color: #f9fafb; }
.hover\:bg-brand-600:hover { background-color: var(--brand-600); }
.hover\:text-white:hover { color: #fff; }
.hover\:text-gray-600:hover { color: #4b5563; }
.hover\:text-red-700:hover { color: #b91c1c; }
.hover\:text-brand-700:hover { color: var(--brand-700); }
.hover\:opacity-100:hover { opacity: 1; }

/* --- Responsive: sm (>= 640px) --- */
@media (min-width: 640px) {
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* --- Responsive: md (>= 768px) --- */
@media (min-width: 768px) {
  .md\:flex { display: flex; }
}

/* --- Responsive: lg (>= 1024px) --- */
@media (min-width: 1024px) {
  .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* --- Responsive: xl (>= 1280px) --- */
@media (min-width: 1280px) {
  .xl\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ============================
   CUSTOM COMPONENT STYLES
   ============================ */

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #94a3b8;
  transition: all 0.15s ease;
  cursor: pointer;
  text-decoration: none;
}
.sidebar-link:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: #e2e8f0;
}
.sidebar-link.active {
  background-color: rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  border: none;
  line-height: 1.5;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--brand-600); color: white; }
.btn-primary:hover:not(:disabled) { background: var(--brand-700); }
.btn-secondary { background: white; color: #374151; border: 1px solid #d1d5db; }
.btn-secondary:hover:not(:disabled) { background: #f9fafb; }
.btn-danger { background: #dc2626; color: white; }
.btn-danger:hover:not(:disabled) { background: #b91c1c; }
.btn-ghost { background: transparent; color: #6b7280; }
.btn-ghost:hover:not(:disabled) { background: #f3f4f6; color: #374151; }
.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8125rem; }

.input {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  line-height: 1.5;
  background: white;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.input:focus {
  outline: none;
  border-color: var(--brand-500);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}
.input-error { border-color: #dc2626; }
.input-error:focus { box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1); }

.card {
  background: white;
  border-radius: 0.75rem;
  border: 1px solid #e5e7eb;
  padding: 1.5rem;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.04);
}

.table-container { overflow-x: auto; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.data-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #6b7280;
  border-bottom: 1px solid #e5e7eb;
  white-space: nowrap;
}
.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #f3f4f6;
  white-space: nowrap;
}
.data-table tbody tr:hover { background-color: #f9fafb; }

.progress-bar {
  width: 100%;
  height: 0.5rem;
  background: #e5e7eb;
  border-radius: 9999px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  border-radius: 9999px;
  transition: width 0.5s ease;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
  animation: fadeIn 0.15s ease;
}
.modal-panel {
  background: white;
  border-radius: 0.75rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 28rem;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.2s ease;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  animation: slideIn 0.2s ease;
  min-width: 280px;
}
.toast-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.toast-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.toast-info { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }

@keyframes slideIn { from { opacity: 0; transform: translateX(1rem); } to { opacity: 1; transform: translateX(0); } }

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  color: #9ca3af;
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.625rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-income { background: #dcfce7; color: #166534; }
.badge-expense { background: #fee2e2; color: #991b1b; }

.color-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 9999px;
  display: inline-block;
  flex-shrink: 0;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #111827;
}

.filter-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

select.input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

textarea.input {
  resize: vertical;
  min-height: 2.5rem;
}