:root {
  --bg: #0f0f1a;
  --surface: #1a1a2e;
  --surface-hover: #222244;
  --border: #2a2a4a;
  --text: #e8e8f0;
  --text-secondary: #8888aa;
  --primary: #6c5ce7;
  --primary-hover: #7c6cf7;
  --primary-glow: rgba(108, 92, 231, 0.3);
  --success: #00b894;
  --danger: #ff6b6b;
  --danger-hover: #ff5252;
  --warning: #fdcb6e;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* ---- Layout ---- */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* ---- Sidebar ---- */
.sidebar {
  width: 240px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 100;
  transition: transform var(--transition);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 24px 20px;
  border-bottom: 1px solid var(--border);
}

.logo i {
  font-size: 1.8rem;
  color: var(--primary);
  filter: drop-shadow(0 0 8px var(--primary-glow));
}

.logo h1 {
  font-size: 1.3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--success));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition);
}

.nav-item:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.nav-item.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 0 20px var(--primary-glow);
}

.nav-item i {
  width: 20px;
  text-align: center;
  font-size: 1.1rem;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ---- Main Content ---- */
.main-content {
  flex: 1;
  margin-left: 240px;
  padding: 0;
}

.main-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 32px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 4px;
}

.header-search {
  flex: 1;
  max-width: 360px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  transition: border-color var(--transition);
}

.header-search:focus-within {
  border-color: var(--primary);
}

.header-search i {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.header-search input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
}

.header-summary {
  text-align: right;
  background: linear-gradient(135deg, var(--primary), #a29bfe);
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  min-width: 140px;
}

.header-summary span {
  display: block;
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}

.header-summary small {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ---- Views ---- */
.views {
  padding: 24px 32px;
}

.view {
  display: none;
  animation: fadeIn 0.3s ease;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.view-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ---- Stats Grid ---- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all var(--transition);
}

.stat-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--primary-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--primary);
  flex-shrink: 0;
}

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

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 1.4rem;
  font-weight: 700;
}

/* ---- Dashboard Grid ---- */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
}

.chart-container {
  min-height: 280px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: flex-end;
}

.chart-bar-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chart-bar-label {
  min-width: 100px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-align: right;
}

.chart-bar-track {
  flex: 1;
  height: 28px;
  background: var(--bg);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}

.chart-bar-fill {
  height: 100%;
  border-radius: 6px;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 4px;
}

.chart-bar-value {
  min-width: 60px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  text-align: right;
}

.chart-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 200px;
  color: var(--text-secondary);
  gap: 8px;
}

.chart-empty i {
  font-size: 2.5rem;
  opacity: 0.3;
}

/* ---- Recent List ---- */
.recent-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.recent-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg);
  transition: background var(--transition);
}

.recent-item:hover {
  background: var(--surface-hover);
}

.recent-item .recent-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.recent-item .recent-info {
  flex: 1;
  min-width: 0;
}

.recent-item .recent-name {
  font-weight: 500;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.recent-item .recent-amount {
  font-weight: 700;
  font-size: 0.9rem;
}

/* ---- View Header (filters) ---- */
.view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.filter-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-controls select {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition);
}

.filter-controls select:focus {
  border-color: var(--primary);
}

/* ---- Table ---- */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.expense-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.expense-table thead {
  background: var(--surface);
}

.expense-table th {
  text-align: left;
  padding: 14px 16px;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.expense-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.expense-table tbody tr:hover td {
  background: var(--surface-hover);
}

.expense-table tbody tr:last-child td {
  border-bottom: none;
}

.expense-table .category-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
}

.expense-table .amount-cell {
  font-weight: 700;
}

.expense-table .delete-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 6px;
  transition: all var(--transition);
  font-size: 0.9rem;
}

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

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-secondary);
  font-size: 1rem;
}

/* ---- Form ---- */
.expense-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 560px;
  margin-bottom: 28px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  font-family: var(--font);
  outline: none;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.btn-primary {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary), #a29bfe);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--primary-glow);
}

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

/* ---- Quick Actions ---- */
.quick-actions h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-secondary);
}

.quick-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.quick-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.85rem;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
}

.quick-btn:hover {
  border-color: var(--primary);
  background: var(--surface-hover);
  transform: translateY(-1px);
}

.quick-btn i {
  color: var(--primary);
}

/* ---- Toast ---- */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 360px;
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOut {
  to { opacity: 0; transform: translateX(50px); }
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
  }

  .menu-toggle {
    display: block;
  }

  .main-header {
    padding: 12px 16px;
  }

  .views {
    padding: 16px;
  }

  .header-search {
    max-width: none;
  }

  .header-summary {
    display: none;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .view-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .filter-controls {
    width: 100%;
  }

  .filter-controls select {
    flex: 1;
  }
}