@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Color Palette */
  --primary: hsl(210, 100%, 56%);
  --primary-dark: hsl(210, 100%, 46%);
  --primary-light: hsl(210, 100%, 66%);
  --secondary: hsl(280, 70%, 60%);
  --secondary-dark: hsl(280, 70%, 50%);
  --accent: hsl(340, 82%, 62%);
  --success: hsl(142, 71%, 45%);
  --warning: hsl(38, 92%, 50%);
  --error: hsl(4, 90%, 58%);

  /* Neutral Colors */
  --bg-primary: hsl(220, 26%, 14%);
  --bg-secondary: hsl(220, 26%, 18%);
  --bg-tertiary: hsl(220, 26%, 22%);
  --text-primary: hsl(0, 0%, 98%);
  --text-secondary: hsl(0, 0%, 75%);
  --text-tertiary: hsl(0, 0%, 60%);
  --border: hsl(220, 26%, 30%);

  /* Glassmorphism */
  --glass-bg: hsla(220, 26%, 18%, 0.7);
  --glass-border: hsla(0, 0%, 100%, 0.1);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 20px rgba(33, 150, 243, 0.3);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Animated Background */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 20% 50%,
      hsla(210, 100%, 56%, 0.1) 0%,
      transparent 50%),
    radial-gradient(circle at 80% 80%,
      hsla(280, 70%, 60%, 0.1) 0%,
      transparent 50%);
  animation: backgroundShift 20s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes backgroundShift {

  0%,
  100% {
    transform: translate(0, 0);
  }

  50% {
    transform: translate(-5%, -5%);
  }
}

/* Container */
.container {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

/* Header */
header {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
}

header h1 {
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Navigation */
nav {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

nav::-webkit-scrollbar {
  display: none;
}

.nav-btn {
  flex-shrink: 0;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.nav-btn:hover {
  background: var(--bg-secondary);
  border-color: var(--primary);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.nav-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-color: transparent;
  color: var(--text-primary);
  box-shadow: var(--shadow-glow);
}

/* Views */
.view {
  display: none;
  animation: fadeIn var(--transition-base);
}

.view.active {
  display: block;
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Section Styles */
section {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-md);
}

section h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

.btn-danger {
  background: var(--error);
  color: white;
}

.btn-danger:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.85rem;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card-badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-domestic {
  background: hsla(210, 100%, 56%, 0.2);
  color: var(--primary-light);
  border: 1px solid var(--primary);
}

.badge-industrial {
  background: hsla(280, 70%, 60%, 0.2);
  color: var(--secondary);
  border: 1px solid var(--secondary);
}

.badge-paid {
  background: hsla(142, 71%, 45%, 0.2);
  color: var(--success);
  border: 1px solid var(--success);
}

.badge-unpaid {
  background: hsla(4, 90%, 58%, 0.2);
  color: var(--error);
  border: 1px solid var(--error);
}

.badge-partial {
  background: hsla(38, 92%, 50%, 0.2);
  color: var(--warning);
  border: 1px solid var(--warning);
}

.card-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
}

.info-label {
  color: var(--text-tertiary);
}

.info-value {
  color: var(--text-primary);
  font-weight: 500;
}

.card-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

input,
select,
textarea {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all var(--transition-base);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px hsla(210, 100%, 56%, 0.1);
}

input::placeholder {
  color: var(--text-tertiary);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  padding: var(--spacing-md);
  overflow-y: auto;
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn var(--transition-base);
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  max-width: 500px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  animation: slideUp var(--transition-base);
  max-height: 90vh;
  overflow-y: auto;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 600;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.close-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-footer {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
  justify-content: flex-end;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-tertiary);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.3;
}

.empty-state-text {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-lg);
}

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

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-sm);
  }

  header {
    padding: var(--spacing-md);
  }

  section {
    padding: var(--spacing-lg);
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

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

  .card-actions {
    flex-direction: column;
  }

  .card-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .modal-content {
    margin: var(--spacing-md);
  }
}

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

  .nav-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.85rem;
  }
}

/* Search Box */
.search-box {
  margin-bottom: var(--spacing-lg);
}

.search-input {
  width: 100%;
  max-width: 400px;
  padding: var(--spacing-sm) var(--spacing-md);
  padding-left: 2.5rem;
  background: var(--bg-tertiary) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="%23999" stroke-width="2"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.35-4.35"/></svg>') no-repeat 0.75rem center;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all var(--transition-base);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px hsla(210, 100%, 56%, 0.1);
}

/* View Toggle */
.view-toggle {
  display: flex;
  gap: var(--spacing-xs);
  background: var(--bg-tertiary);
  padding: var(--spacing-xs);
  border-radius: var(--radius-md);
}

.view-toggle-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-size: 0.9rem;
}

.view-toggle-btn.active {
  background: var(--primary);
  color: var(--text-primary);
}

.view-toggle-btn:hover:not(.active) {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* Table Styles */
.table-container {
  overflow-x: auto;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-top: var(--spacing-lg);
}

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

thead {
  background: var(--bg-tertiary);
  border-bottom: 2px solid var(--border);
}

thead th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: all var(--transition-fast);
}

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

tbody tr:hover {
  background: var(--bg-tertiary);
}

tbody td {
  padding: var(--spacing-md);
  color: var(--text-secondary);
}

tbody td:first-child {
  font-weight: 500;
  color: var(--text-primary);
}

.table-actions {
  display: flex;
  gap: var(--spacing-xs);
}

.table-actions .btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.85rem;
}

/* Responsive: Hide table on mobile, show cards */
@media (max-width: 768px) {
  .table-view {
    display: none !important;
  }

  .card-view {
    display: grid !important;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .view-toggle {
    display: none;
  }

  .cards-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .card {
    width: 100%;
  }
}

/* Responsive: Show table on desktop, hide cards by default */
@media (min-width: 769px) {
  .table-view {
    display: block;
  }

  .card-view {
    display: none;
  }

  .card-view.active {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
  }

  .table-view.hidden {
    display: none;
  }
}

/* Utility Classes */
.messages {
  margin-bottom: var(--spacing-lg);
}

.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
  animation: slideDown var(--transition-base);
  border-left: 4px solid;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.alert-success {
  background: hsla(142, 71%, 45%, 0.15);
  color: var(--success);
  border-left-color: var(--success);
}

.alert-error,
.alert-danger {
  background: hsla(4, 90%, 58%, 0.15);
  color: var(--error);
  border-left-color: var(--error);
}

.alert-warning {
  background: hsla(38, 92%, 50%, 0.15);
  color: var(--warning);
  border-left-color: var(--warning);
}

.alert-info {
  background: hsla(210, 100%, 56%, 0.15);
  color: var(--primary-light);
  border-left-color: var(--primary);
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: var(--spacing-sm);
}

.mt-2 {
  margin-top: var(--spacing-md);
}

.mt-3 {
  margin-top: var(--spacing-lg);
}

.mb-1 {
  margin-bottom: var(--spacing-sm);
}

.mb-2 {
  margin-bottom: var(--spacing-md);
}

.mb-3 {
  margin-bottom: var(--spacing-lg);
}

.hidden {
  display: none;
}