/* ==========================================================================
   ILSITODI.IT — Modern Enterprise Design System (Clean Light Theme)
   Modern Typography | Crisp Shadows | WCAG AA Compliant | Mobile-First (>=320px)
   ========================================================================== */

:root {
  --bg-body: #ffffff;
  --bg-surface: #ffffff;
  --bg-muted: #f8fafc;
  --bg-subtle: #f1f5f9;
  
  --border-light: #e2e8f0;
  --border-subtle: #cbd5e1;
  --border-focus: #2563eb;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  --primary-blue: #1d4ed8;
  --primary-blue-hover: #1e40af;
  --primary-blue-subtle: #eff6ff;
  --primary-blue-border: #bfdbfe;
  
  --accent-emerald: #059669;
  --accent-emerald-hover: #047857;
  --accent-emerald-subtle: #ecfdf5;
  
  --accent-amber: #d97706;
  --accent-amber-subtle: #fffbeb;
  
  --accent-rose: #e11d48;
  --accent-rose-subtle: #fff1f2;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, -apple-system, "Helvetica Neue", Arial, sans-serif;
  
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.07), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 30px -6px rgba(0, 0, 0, 0.1), 0 8px 10px -4px rgba(0, 0, 0, 0.04);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  
  --min-touch-target: 44px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  min-width: 320px;
}

.container {
  width: 100%;
  max-width: 1140px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.container-narrow {
  max-width: 780px;
}

/* Header */
.site-header {
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: all 0.2s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-logo {
  font-size: 21px;
  font-weight: 800;
  color: var(--primary-blue);
  text-decoration: none;
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-logo span {
  color: var(--text-primary);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.025em;
}

h1 {
  font-size: clamp(30px, 4.5vw, 48px);
}

h2 {
  font-size: clamp(24px, 3.2vw, 34px);
}

h3 {
  font-size: 20px;
  font-weight: 700;
}

p {
  color: var(--text-secondary);
}

.lead {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
}

.badge-label {
  background-color: var(--primary-blue-subtle);
  color: var(--primary-blue);
  border: 1px solid var(--primary-blue-border);
}

.badge-demo {
  background-color: var(--accent-amber-subtle);
  color: var(--accent-amber);
  border: 1px solid rgba(217, 119, 6, 0.25);
}

.badge-success {
  background-color: var(--accent-emerald-subtle);
  color: var(--accent-emerald);
  border: 1px solid rgba(5, 150, 105, 0.25);
}

.badge-danger {
  background-color: var(--accent-rose-subtle);
  color: var(--accent-rose);
  border: 1px solid rgba(225, 29, 72, 0.25);
}

.badge-neutral {
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--min-touch-target);
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid transparent;
  gap: 8px;
}

.btn-primary {
  background-color: var(--primary-blue);
  color: var(--text-inverse);
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.btn-primary:hover {
  background-color: var(--primary-blue-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(29, 78, 216, 0.25);
}

.btn-outline {
  background-color: var(--bg-surface);
  border-color: var(--border-light);
  color: var(--text-primary);
}

.btn-outline:hover {
  background-color: var(--bg-muted);
  border-color: var(--border-subtle);
}

.btn-success {
  background-color: var(--accent-emerald);
  color: var(--text-inverse);
}

.btn-success:hover {
  background-color: var(--accent-emerald-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(5, 150, 105, 0.25);
}

.btn-lg {
  min-height: 50px;
  padding: 12px 28px;
  font-size: 16px;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* Form Elements */
.form-input, .form-select, .form-textarea {
  width: 100%;
  min-height: var(--min-touch-target);
  padding: 12px 16px;
  font-size: 16px;
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

/* Cards */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  border-color: var(--border-subtle);
}

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

.card-muted {
  background-color: var(--bg-muted);
}

/* Footer */
.site-footer {
  background-color: #f8fafc;
  border-top: 1px solid var(--border-light);
  padding: 48px 0 24px 0;
  font-size: 14px;
}

@media (min-width: 641px) {
  .mobile-only {
    display: none !important;
  }
}

@media (max-width: 640px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .card {
    padding: 18px;
  }
}