:root {
  --primary-color: #000000;
  --primary-hover: #000000;
  --primary-light: #e0e7ff;
  --secondary-color: #f8fafc;
  --text-color: #1e293b;
  --text-light: #64748b;
  --border-color: #e2e8f0;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --info-color: #000000;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --sidebar-width: 240px;
  --header-height: 70px;
  --border-radius: 12px;
  --transition-speed: 0.3s;
}

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: #f1f5f9;
  height: 100vh;
  overflow: hidden;
}

.app-container {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background: linear-gradient(to bottom, #000000, #000000);
  color: white;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  height: 100%;
  box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
  z-index: 10;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.logo i {
  font-size: 1.75rem;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
}

nav ul {
  list-style: none;
  padding: 0;
}

nav li {
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color var(--transition-speed);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

nav li:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

nav li.active {
  background-color: rgba(255, 255, 255, 0.2);
  font-weight: 500;
}

nav li i {
  width: 20px;
  text-align: center;
}

.sidebar-footer {
  margin-top: auto;
  text-align: center;
  font-size: 0.875rem;
  opacity: 0.7;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.sidebar-footer i.fa-heart {
  color: #f87171;
}

.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  height: 100%;
}

.top-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.top-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-profile span {
  color: var(--text-light);
}

.avatar {
  width: 40px;
  height: 40px;
  background-color: var(--primary-light);
  color: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto;
  gap: 1.5rem;
  grid-template-areas:
    "summary summary summary"
    "add-bill monthly-breakdown category-breakdown"
    "bills bills bills";
}

.card {
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.card-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.summary-cards {
  grid-area: summary;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.summary-cards .card {
  display: flex;
  align-items: center;
  padding: 1.5rem;
}

.card-icon {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 1rem;
  font-size: 1.5rem;
}

.total-card .card-icon {
  background-color: rgba(99, 102, 241, 0.1);
  color: var(--primary-color);
}

.month-card .card-icon {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--success-color);
}

.category-card .card-icon {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--warning-color);
}

.bill-card .card-icon {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--info-color);
}

.card-content h3 {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-light);
  margin-bottom: 0.25rem;
}

.card-content p {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-color);
}

.add-bill-section {
  grid-area: add-bill;
}

.add-bill-section form {
  padding: 1.5rem;
}

.form-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-group {
  flex: 1;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--text-light);
}

.input-icon {
  position: relative;
}

.input-icon i {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
}

.input-icon input,
.input-icon select {
  padding-left: 2.5rem;
}

input,
select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.875rem;
  transition: border-color var(--transition-speed),
    box-shadow var(--transition-speed);
  background-color: var(--secondary-color);
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-speed);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  justify-content: center;
  width: 100%;
  margin-top: 1rem;
}

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

.monthly-breakdown {
  grid-area: monthly-breakdown;
}

.chart-container {
  padding: 1.5rem;
  height: 300px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.month-bar-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.month-label {
  width: 100px;
  font-size: 0.875rem;
  color: var(--text-light);
}

.month-bar-wrapper {
  flex: 1;
  background-color: var(--border-color);
  height: 12px;
  border-radius: 6px;
  overflow: hidden;
}

.month-bar {
  height: 100%;
  background: linear-gradient(to right, #4f46e5, #6366f1);
  border-radius: 6px;
}

.month-amount {
  width: 80px;
  text-align: right;
  font-size: 0.875rem;
  font-weight: 500;
}

.category-breakdown {
  grid-area: category-breakdown;
}

.category-item {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.category-color {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  margin-right: 0.75rem;
}

.category-name {
  flex: 1;
  font-size: 0.875rem;
}

.category-amount {
  font-weight: 500;
  font-size: 0.875rem;
}

.bills-section {
  grid-area: bills;
}

.bills-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.filter-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-controls label {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.filter-controls select {
  width: auto;
  padding: 0.5rem;
}

.bills-list-container {
  padding: 1rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 1rem;
  text-align: left;
}

th {
  font-weight: 500;
  color: var(--text-light);
  font-size: 0.875rem;
  border-bottom: 1px solid var(--border-color);
}

th i {
  margin-right: 0.5rem;
}

td {
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
}

tr:last-child td {
  border-bottom: none;
}

.bill-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-delete {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--danger-color);
  border: none;
  padding: 0.5rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color var(--transition-speed);
}

.btn-delete:hover {
  background-color: rgba(239, 68, 68, 0.2);
}

#no-bills-message {
  text-align: center;
  padding: 3rem;
  color: var(--text-light);
  font-style: italic;
}

footer {
  text-align: center;
  padding: 1rem 0;
  color: var(--text-light);
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
}

@media (max-width: 1200px) {
  .dashboard-grid {
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "summary summary"
      "add-bill monthly-breakdown"
      "category-breakdown category-breakdown"
      "bills bills";
  }

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

@media (max-width: 900px) {
  .sidebar {
    width: 80px;
  }

  .logo h1,
  .sidebar-footer p,
  nav li span {
    display: none;
  }

  .logo {
    justify-content: center;
  }

  nav li {
    justify-content: center;
    padding: 0.75rem;
  }

  nav li i {
    margin: 0;
    font-size: 1.25rem;
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      "summary"
      "add-bill"
      "monthly-breakdown"
      "category-breakdown"
      "bills";
  }
}

@media (max-width: 768px) {
  .bills-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  th,
  td {
    padding: 0.5rem;
  }
}

@media (max-width: 600px) {
  .summary-cards {
    grid-template-columns: 1fr;
  }

  .form-row {
    flex-direction: column;
  }

  .top-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  th:nth-child(3),
  td:nth-child(3) {
    display: none;
  }
}

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

.card {
  animation: fadeIn 0.3s ease-out;
}

.summary-cards .card:nth-child(1) {
  animation-delay: 0.1s;
}
.summary-cards .card:nth-child(2) {
  animation-delay: 0.2s;
}
.summary-cards .card:nth-child(3) {
  animation-delay: 0.3s;
}
.summary-cards .card:nth-child(4) {
  animation-delay: 0.4s;
}