/*
 * SafetyWork Design System
 *
 * Sistema di design unificato per l'applicazione SafetyWork.
 * Include variabili CSS, utility classes e componenti standardizzati.
 */

/* ==========================================
   CSS VARIABLES - Design Tokens
   ========================================== */

:root {
  /* Professional Font Family */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  /* Brand Colors */
  --brand-primary: #2563eb;
  --brand-primary-dark: #1d4ed8;
  --brand-primary-light: #3b82f6;
  --brand-accent: #0ea5e9;
  --brand-surface: #f8fafc;
  --brand-surface-dark: #1e293b;

  /* Spacing Scale */
  --spacing-xs: 0.25rem;    /* 4px */
  --spacing-sm: 0.5rem;     /* 8px */
  --spacing-md: 1rem;       /* 16px */
  --spacing-lg: 1.5rem;     /* 24px */
  --spacing-xl: 2rem;       /* 32px */
  --spacing-2xl: 3rem;      /* 48px */
  --spacing-3xl: 4rem;      /* 64px */

  /* Border Radius */
  --radius-sm: 0.25rem;     /* 4px */
  --radius-md: 0.375rem;    /* 6px */
  --radius-lg: 0.5rem;      /* 8px */
  --radius-xl: 0.75rem;     /* 12px */
  --radius-2xl: 1rem;       /* 16px */
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Typography */
  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-base: 1rem;    /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem;  /* 36px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Letter Spacing */
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;

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

  /* Z-index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;

  /* Status Colors */
  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-danger: #dc2626;
  --color-info: #0ea5e9;
  --color-muted: #64748b;

  /* Navbar Height */
  --navbar-height: 64px;
}

/* Apply professional font */
body {
  font-family: var(--font-family-base);
  letter-spacing: var(--letter-spacing-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  letter-spacing: var(--letter-spacing-tight);
}

/* Dark Mode Variables */
[data-bs-theme="dark"] {
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  --brand-surface: #0f172a;
  --brand-surface-dark: #1e293b;
}

/* ==========================================
   PROFESSIONAL NAVBAR
   ========================================== */

#main-navbar {
  height: var(--navbar-height);
  padding: 0;
  border-bottom: 1px solid var(--bs-border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow var(--transition-base);
  z-index: var(--z-sticky);
}

#main-navbar.navbar-scrolled {
  box-shadow: var(--shadow-md);
}

#main-navbar .container {
  height: 100%;
}

#main-navbar .navbar-brand {
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

#main-navbar .navbar-brand img {
  height: 40px;
  width: auto;
}

#main-navbar .navbar-brand .brand-text {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-tight);
  line-height: 1.2;
}

#main-navbar .navbar-brand .brand-subtitle {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-normal);
  opacity: 0.7;
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
}

#main-navbar .navbar-nav .nav-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

#main-navbar .navbar-nav .nav-link:hover {
  background-color: rgba(var(--bs-primary-rgb), 0.08);
}

#main-navbar .navbar-nav .nav-link.active,
#main-navbar .navbar-nav .nav-item.active > .nav-link {
  color: var(--bs-primary) !important;
  background-color: rgba(var(--bs-primary-rgb), 0.1);
}

/* User Avatar Circle */
.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  flex-shrink: 0;
}

/* Content offset for fixed navbar */
main.container {
  padding-top: calc(var(--navbar-height) + var(--spacing-lg));
}

/* ==========================================
   PROFESSIONAL FOOTER
   ========================================== */

#main-footer {
  border-top: 1px solid var(--bs-border-color);
  padding: var(--spacing-xl) 0;
  font-size: var(--font-size-sm);
}

#main-footer .footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

#main-footer .footer-brand img {
  height: 36px;
  width: auto;
  opacity: 0.8;
}

#main-footer .footer-links a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

#main-footer .footer-links a:hover {
  color: var(--bs-body-color);
}

/* ==========================================
   LANDING / HERO
   ========================================== */

.hero-section {
  min-height: calc(100vh - var(--navbar-height));
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-section::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-tight);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-muted);
  line-height: var(--line-height-relaxed);
  max-width: 600px;
}

.feature-card {
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  border: 1px solid var(--bs-border-color);
  background: var(--bs-body-bg);
  transition: all var(--transition-base);
  height: 100%;
}

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

.feature-card .feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

.feature-card h5 {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  margin-bottom: 0;
  line-height: var(--line-height-relaxed);
}

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

/* Spacing Utilities */
.gap-xs { gap: var(--spacing-xs) !important; }
.gap-sm { gap: var(--spacing-sm) !important; }
.gap-md { gap: var(--spacing-md) !important; }
.gap-lg { gap: var(--spacing-lg) !important; }
.gap-xl { gap: var(--spacing-xl) !important; }

/* Border Radius Utilities */
.rounded-sm { border-radius: var(--radius-sm) !important; }
.rounded-md { border-radius: var(--radius-md) !important; }
.rounded-lg { border-radius: var(--radius-lg) !important; }
.rounded-xl { border-radius: var(--radius-xl) !important; }
.rounded-2xl { border-radius: var(--radius-2xl) !important; }

/* Shadow Utilities */
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }
.shadow-xl { box-shadow: var(--shadow-xl) !important; }

/* Typography Utilities */
.font-weight-medium { font-weight: var(--font-weight-medium) !important; }
.font-weight-semibold { font-weight: var(--font-weight-semibold) !important; }

.text-xs { font-size: var(--font-size-xs) !important; }
.text-sm { font-size: var(--font-size-sm) !important; }
.text-lg { font-size: var(--font-size-lg) !important; }
.text-xl { font-size: var(--font-size-xl) !important; }
.text-2xl { font-size: var(--font-size-2xl) !important; }

/* Transition Utilities */
.transition-fast { transition: all var(--transition-fast) !important; }
.transition-base { transition: all var(--transition-base) !important; }
.transition-slow { transition: all var(--transition-slow) !important; }

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

/* Page Header */
.page-header {
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--bs-border-color);
}

.page-header h1 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
}

/* Filter Card */
.filter-card {
  border: 1px solid var(--bs-border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

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

.filter-card .card-header {
  background: var(--bs-body-bg);
  border-bottom: 1px solid var(--bs-border-color);
  padding: var(--spacing-lg);
}

.filter-card .card-body {
  padding: var(--spacing-lg);
}

/* Action Buttons */
.btn-group-sm > .btn {
  padding: 0.375rem 0.5rem;
  font-size: var(--font-size-sm);
}

.btn-group-md > .btn {
  padding: 0.5rem 0.75rem;
  font-size: var(--font-size-base);
}

.btn-group-lg > .btn {
  padding: 0.75rem 1rem;
  font-size: var(--font-size-lg);
}

/* Empty State */
.empty-state {
  padding: var(--spacing-3xl) var(--spacing-xl);
  min-height: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.empty-state-icon {
  opacity: 0.6;
}

.empty-state-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--bs-body-color);
}

.empty-state-message {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
}

/* Status Badges */
.badge {
  font-weight: var(--font-weight-medium);
  padding: 0.35em 0.65em;
  transition: all var(--transition-fast);
}

.badge-sm {
  font-size: var(--font-size-xs);
  padding: 0.25em 0.5em;
}

.badge-lg {
  font-size: var(--font-size-base);
  padding: 0.5em 0.85em;
}

/* Cards */
.card {
  border: 1px solid var(--bs-border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

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

.card-header {
  background: var(--bs-body-bg);
  border-bottom: 1px solid var(--bs-border-color);
  padding: var(--spacing-lg);
  font-weight: var(--font-weight-semibold);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  background: var(--bs-body-bg);
  border-top: 1px solid var(--bs-border-color);
  padding: var(--spacing-md) var(--spacing-lg);
}

/* Stats Card */
.stats-card {
  border-left: 4px solid var(--bs-primary);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.stats-card.stats-success {
  border-left-color: var(--color-success);
}

.stats-card.stats-warning {
  border-left-color: var(--color-warning);
}

.stats-card.stats-danger {
  border-left-color: var(--color-danger);
}

.stats-card.stats-info {
  border-left-color: var(--color-info);
}

/* Tables */
.table {
  border-collapse: separate;
  border-spacing: 0;
}

.table thead th {
  background: var(--bs-body-bg);
  font-weight: var(--font-weight-semibold);
  border-bottom: 2px solid var(--bs-border-color);
  padding: var(--spacing-md);
  white-space: nowrap;
}

.table tbody td {
  padding: var(--spacing-md);
  vertical-align: middle;
}

.table-hover tbody tr {
  transition: background-color var(--transition-fast);
}

.table-hover tbody tr:hover {
  background-color: var(--bs-table-hover-bg);
}

/* Forms */
.form-label {
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-sm);
  color: var(--bs-body-color);
}

.form-control,
.form-select {
  border-radius: var(--radius-md);
  border: 1px solid var(--bs-border-color);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
  border-color: var(--bs-primary);
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-control.is-invalid,
.form-select.is-invalid {
  border-color: var(--color-danger);
}

.form-control.is-invalid:focus,
.form-select.is-invalid:focus {
  box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25);
}

/* Buttons */
.btn {
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  padding: 0.5rem 1rem;
}

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

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

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-lg);
}

/* Modals */
.modal-content {
  border: none;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}

.modal-header {
  border-bottom: 1px solid var(--bs-border-color);
  padding: var(--spacing-lg) var(--spacing-xl);
}

.modal-body {
  padding: var(--spacing-xl);
}

.modal-footer {
  border-top: 1px solid var(--bs-border-color);
  padding: var(--spacing-lg) var(--spacing-xl);
}

/* Alerts */
.alert {
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  padding: var(--spacing-md) var(--spacing-lg);
}

.alert .alert-heading {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

/* Breadcrumbs */
.breadcrumb {
  background: transparent;
  padding: 0;
  margin-bottom: var(--spacing-md);
}

.breadcrumb-item + .breadcrumb-item::before {
  color: var(--bs-secondary);
}

/* Loading States */
.btn-loading {
  position: relative;
  pointer-events: none;
  opacity: 0.65;
}

.loading-spinner {
  padding: var(--spacing-xl);
}

/* Page Loading Overlay */
.page-loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  animation: fadeIn 0.2s ease-out;
}

.page-loading-content {
  background: var(--bs-body-bg);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  text-align: center;
  min-width: 200px;
}

[data-bs-theme="dark"] .page-loading-content {
  background: var(--bs-dark);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Skeleton Loading (for future use) */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: var(--radius-md);
}

[data-bs-theme="dark"] .skeleton {
  background: linear-gradient(90deg, #2a2a2a 25%, #3a3a3a 50%, #2a2a2a 75%);
  background-size: 200% 100%;
}

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

/* Toast Notifications */
.toast-container {
  z-index: 9999;
}

.toast {
  background: var(--bs-body-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  min-width: 300px;
  max-width: 500px;
}

.toast-header {
  background: var(--bs-body-bg);
  border-bottom: 1px solid var(--bs-border-color);
  padding: var(--spacing-sm) var(--spacing-md);
  font-weight: var(--font-weight-semibold);
}

.toast-body {
  padding: var(--spacing-md);
  color: var(--bs-body-color);
}

/* Toast animations */
@keyframes toastSlideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

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

.toast.showing {
  animation: toastSlideIn 0.3s ease-out;
}

.toast.hide {
  animation: toastSlideOut 0.3s ease-in;
}

/* Pagination */
.pagination {
  gap: var(--spacing-xs);
}

.page-link {
  border-radius: var(--radius-md);
  border: 1px solid var(--bs-border-color);
  transition: all var(--transition-fast);
  margin: 0 2px;
}

.page-link:hover {
  background-color: var(--bs-primary);
  border-color: var(--bs-primary);
  color: white;
  transform: translateY(-1px);
}

.page-item.active .page-link {
  background-color: var(--bs-primary);
  border-color: var(--bs-primary);
}

/* ==========================================
   RESPONSIVE UTILITIES
   ========================================== */

/* Mobile optimizations */
@media (max-width: 768px) {
  .page-header h1 {
    font-size: var(--font-size-2xl);
  }

  .empty-state {
    padding: var(--spacing-xl);
    min-height: 250px;
  }

  .card-body,
  .card-header,
  .modal-body,
  .modal-header {
    padding: var(--spacing-md);
  }

  .table thead th,
  .table tbody td {
    padding: var(--spacing-sm);
    font-size: var(--font-size-sm);
  }
}

/* ==========================================
   ACCESSIBILITY IMPROVEMENTS
   ========================================== */

/* Focus visible styles */
*:focus-visible {
  outline: 2px solid var(--bs-primary);
  outline-offset: 2px;
}

/* Skip to main content link */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--bs-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  z-index: var(--z-tooltip);
}

.skip-to-main:focus {
  top: 0;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ==========================================
   PRINT STYLES
   ========================================== */

@media print {
  .page-header,
  .btn,
  .nav,
  .sidebar,
  .filter-card,
  .modal {
    display: none !important;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ccc;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }
}