/* ================================================================
   InvoiceTracker — Design System
   Clean, bright, minimalist SaaS aesthetic
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ----------------------------------------------------------------
   Design Tokens
   ---------------------------------------------------------------- */
:root {
  /* Colors */
  --color-bg: #f8f9fc;
  --color-surface: #ffffff;
  --color-surface-hover: #f1f3f9;
  --color-surface-alt: #f0f2f8;
  --color-border: #e2e5f0;
  --color-border-light: #edf0f7;

  --color-text: #1a1d2e;
  --color-text-secondary: #6b7194;
  --color-text-muted: #9da3c0;

  --color-primary: #6366f1;
  --color-primary-hover: #5457e5;
  --color-primary-light: #eef0ff;
  --color-primary-bg: rgba(99, 102, 241, 0.08);

  --color-success: #10b981;
  --color-success-light: #ecfdf5;
  --color-warning: #f59e0b;
  --color-warning-light: #fffbeb;
  --color-danger: #ef4444;
  --color-danger-light: #fef2f2;
  --color-info: #3b82f6;
  --color-info-light: #eff6ff;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.6875rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.9375rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.375rem;
  --font-size-2xl: 1.75rem;
  --font-size-3xl: 2.25rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-sm: 0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-md: 0 4px 8px -2px rgba(16, 24, 40, 0.06), 0 2px 4px rgba(16, 24, 40, 0.04);
  --shadow-lg: 0 12px 24px -4px rgba(16, 24, 40, 0.08), 0 4px 8px rgba(16, 24, 40, 0.03);
  --shadow-xl: 0 20px 40px -8px rgba(16, 24, 40, 0.1);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --sidebar-width: 260px;
  --header-height: 64px;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
}

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

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

.sidebar-header {
  padding: var(--space-6) var(--space-6) var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.sidebar-logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-lg);
  font-weight: 800;
  flex-shrink: 0;
}

.sidebar-logo-text {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.sidebar-logo-badge {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  margin-left: auto;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-4) var(--space-3);
  overflow-y: auto;
}

.sidebar-section-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  padding: var(--space-4) var(--space-3) var(--space-2);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.sidebar-link:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.sidebar-link.active {
  background: var(--color-primary-bg);
  color: var(--color-primary);
  font-weight: 600;
}

.sidebar-link-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: var(--font-size-base);
}

.sidebar-link-badge {
  margin-left: auto;
  font-size: var(--font-size-xs);
  font-weight: 600;
  background: var(--color-danger);
  color: white;
  padding: 1px 7px;
  border-radius: var(--radius-full);
  min-width: 20px;
  text-align: center;
}

/* ----------------------------------------------------------------
   Main Content
   ---------------------------------------------------------------- */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
}

.page-header {
  padding: var(--space-6) var(--space-8);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.page-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.page-body {
  padding: var(--space-8);
}

/* ----------------------------------------------------------------
   Cards
   ---------------------------------------------------------------- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-sm);
}

.card-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.card-body {
  padding: var(--space-6);
}

/* ----------------------------------------------------------------
   Stat Cards
   ---------------------------------------------------------------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-8);
}

.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-xs);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--stat-color, var(--color-primary));
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.stat-card-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.stat-card-value {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.stat-card-sub {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* ----------------------------------------------------------------
   Tables
   ---------------------------------------------------------------- */
.table-wrapper {
  overflow-x: auto;
}

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

thead th {
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition: color var(--transition-fast);
}

thead th:hover {
  color: var(--color-text);
}

tbody tr {
  transition: background var(--transition-fast);
}

tbody tr:hover {
  background: var(--color-surface-hover);
}

tbody td {
  padding: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: middle;
}

.table-empty {
  text-align: center;
  padding: var(--space-12) var(--space-4);
  color: var(--color-text-muted);
}

.table-empty-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-3);
  opacity: 0.5;
}

/* ----------------------------------------------------------------
   Badges
   ---------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-paid {
  background: var(--color-success-light);
  color: var(--color-success);
}

.badge-pending {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.badge-overdue {
  background: var(--color-danger-light);
  color: var(--color-danger);
}

.badge-cancelled {
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ----------------------------------------------------------------
   Provider Dot / Avatar
   ---------------------------------------------------------------- */
.provider-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.provider-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: var(--font-size-sm);
  flex-shrink: 0;
}

.provider-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.provider-name {
  font-weight: 600;
  color: var(--color-text);
}

/* ----------------------------------------------------------------
   Buttons
   ---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  line-height: 1.5;
}

.btn:active {
  transform: scale(0.97);
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-text-muted);
}

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

.btn-danger:hover {
  background: #dc2626;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
  padding: var(--space-1) var(--space-2);
}

.btn-ghost:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.btn-sm {
  font-size: var(--font-size-xs);
  padding: var(--space-1) var(--space-3);
}

.btn-icon {
  padding: var(--space-2);
  min-width: 36px;
  min-height: 36px;
}

.btn-group {
  display: flex;
  gap: var(--space-2);
}

/* ----------------------------------------------------------------
   Forms
   ---------------------------------------------------------------- */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-label-optional {
  font-weight: 400;
  color: var(--color-text-muted);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  padding: var(--space-3) var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  outline: none;
}

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

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-help {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ----------------------------------------------------------------
   Modal
   ---------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 17, 30, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 90%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(16px) scale(0.98);
  transition: transform var(--transition-base);
}

.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  padding: var(--space-6) var(--space-6) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  line-height: 1;
}

.modal-close:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.modal-body {
  padding: 0 var(--space-6) var(--space-6);
}

.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border-light);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* ----------------------------------------------------------------
   Toast Notifications
   ---------------------------------------------------------------- */
.toast-container {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.toast {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--color-primary);
  min-width: 300px;
  max-width: 420px;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  animation: slideInRight var(--transition-base) ease-out;
}

.toast.toast-success { border-left-color: var(--color-success); }
.toast.toast-error { border-left-color: var(--color-danger); }
.toast.toast-warning { border-left-color: var(--color-warning); }

.toast-message {
  flex: 1;
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.toast-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: var(--font-size-lg);
  line-height: 1;
}

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

/* ----------------------------------------------------------------
   Filters Bar
   ---------------------------------------------------------------- */
.filters-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.filter-input {
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast);
  min-width: 140px;
}

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

.filter-input-search {
  flex: 1;
  min-width: 200px;
}

/* ----------------------------------------------------------------
   Chart (CSS-only bar chart)
   ---------------------------------------------------------------- */
.chart-container {
  padding: var(--space-4) 0;
}

.bar-chart {
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
  height: 160px;
  padding-top: var(--space-4);
}

.bar-chart-bar {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
  min-width: 0;
}

.bar-chart-fill {
  width: 100%;
  max-width: 40px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background: linear-gradient(180deg, #6366f1, #8b5cf6);
  transition: height var(--transition-slow);
  min-height: 3px;
  position: relative;
}

.bar-chart-fill:hover {
  opacity: 0.85;
}

.bar-chart-label {
  font-size: 0.625rem;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
  white-space: nowrap;
  text-align: center;
}

.bar-chart-value {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

/* ----------------------------------------------------------------
   Provider Cards Grid
   ---------------------------------------------------------------- */
.providers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
}

.provider-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-xs);
  transition: all var(--transition-fast);
  position: relative;
}

.provider-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.provider-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.provider-card-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.provider-card-stat {
  text-align: center;
  padding: var(--space-3);
  background: var(--color-bg);
  border-radius: var(--radius-md);
}

.provider-card-stat-value {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
}

.provider-card-stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.provider-card-actions {
  margin-top: var(--space-4);
  display: flex;
  gap: var(--space-2);
}

.provider-api-badge {
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.provider-api-badge.connected {
  background: var(--color-success-light);
  color: var(--color-success);
}

/* ----------------------------------------------------------------
   EPN Cards
   ---------------------------------------------------------------- */
.epn-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-5);
}

.epn-card {
  background: linear-gradient(135deg, #1a1d2e, #2d3154);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  color: white;
  position: relative;
  overflow: hidden;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-fast);
}

.epn-card:hover {
  transform: translateY(-2px);
}

.epn-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15), transparent 70%);
  pointer-events: none;
}

.epn-card-brand {
  font-size: var(--font-size-sm);
  font-weight: 600;
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.epn-card-number {
  font-size: var(--font-size-lg);
  font-weight: 600;
  letter-spacing: 0.15em;
  margin: var(--space-4) 0;
}

.epn-card-bottom {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
}

.epn-card-balance-label {
  font-size: var(--font-size-xs);
  opacity: 0.6;
}

.epn-card-balance {
  font-size: var(--font-size-xl);
  font-weight: 800;
}

.epn-card-status {
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.15);
}

/* ----------------------------------------------------------------
   Settings
   ---------------------------------------------------------------- */
.settings-section {
  margin-bottom: var(--space-8);
}

.settings-section-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.api-key-field {
  display: flex;
  gap: var(--space-2);
}

.api-key-field .form-input {
  flex: 1;
  font-family: monospace;
}

/* ----------------------------------------------------------------
   Empty States
   ---------------------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.3;
}

.empty-state-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.empty-state-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  max-width: 400px;
  margin-inline: auto;
}

/* ----------------------------------------------------------------
   Confirm Dialog
   ---------------------------------------------------------------- */
.confirm-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
  margin-top: var(--space-6);
}

.confirm-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ----------------------------------------------------------------
   Amount styling
   ---------------------------------------------------------------- */
.amount {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.amount-large {
  font-size: var(--font-size-xl);
}

/* ----------------------------------------------------------------
   Skeleton loading
   ---------------------------------------------------------------- */
.skeleton {
  background: linear-gradient(90deg, var(--color-surface-alt) 25%, var(--color-border-light) 50%, var(--color-surface-alt) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ----------------------------------------------------------------
   Mobile Menu Toggle
   ---------------------------------------------------------------- */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  padding: var(--space-2);
  color: var(--color-text);
}

/* ----------------------------------------------------------------
   Scrollbar
   ---------------------------------------------------------------- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* ----------------------------------------------------------------
   Responsive
   ---------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }

  .sidebar {
    transform: translateX(-100%);
    width: 260px;
  }

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

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

  .mobile-menu-toggle {
    display: block;
  }

  .page-body {
    padding: var(--space-4);
  }

  .page-header {
    padding: var(--space-4) var(--space-5);
  }

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

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

  .filters-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-input-search {
    min-width: unset;
  }

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

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

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

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

.fade-in {
  animation: fadeIn var(--transition-base) ease-out;
}

/* ----------------------------------------------------------------
   Invoice Amount Cell Coloring
   ---------------------------------------------------------------- */
.cell-actions {
  display: flex;
  gap: var(--space-1);
}

/* ----------------------------------------------------------------
   Tab navigation inside pages
   ---------------------------------------------------------------- */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-6);
}

.tab {
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-5);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: -1px;
}

.tab:hover {
  color: var(--color-text);
}

.tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 600;
}