/**
 * SOVEREIGN TRUST - Core Design System Tokens & Utilities
 * Annuaire Inversé Portable - French Telecom Authority Design System
 */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,600&display=swap');

:root {
  /* Brand / Authority Colors */
  --primary: #00236f;
  --primary-container: #1e3a8a;
  --primary-hover: #172554;
  --primary-light: #2563eb;
  --on-primary: #ffffff;
  --on-primary-container: #dce1ff;

  /* Secondary / Tech Azure */
  --secondary: #006398;
  --secondary-container: #e0f2fe;
  --secondary-hover: #0369a1;
  --secondary-light: #38bdf8;
  --on-secondary: #ffffff;
  --on-secondary-container: #00476e;

  /* Tertiary / Compliance Emerald */
  --tertiary: #059669;
  --tertiary-container: #ecfdf5;
  --tertiary-hover: #047857;
  --on-tertiary: #ffffff;
  --on-tertiary-container: #065f46;

  /* Neutrals & Surfaces */
  --neutral-900: #0f172a;
  --neutral-800: #1e293b;
  --neutral-700: #334155;
  --neutral-600: #475569;
  --neutral-500: #64748b;
  --neutral-400: #94a3b8;
  --neutral-300: #cbd5e1;
  --neutral-200: #e2e8f0;
  --neutral-100: #f1f5f9;
  --neutral-50: #f8fafc;

  --surface: #ffffff;
  --surface-dim: #f1f5f9;
  --surface-bright: #faf8ff;
  --canvas: #f8fafc;
  --on-surface: #0f172a;
  --on-surface-variant: #475569;

  /* Status Colors */
  --error: #ba1a1a;
  --error-container: #fef2f2;
  --error-border: #fecaca;
  --on-error: #ffffff;
  --on-error-container: #991b1b;

  --warning: #b45309;
  --warning-container: #fef3c7;
  --warning-border: #fde68a;
  --on-warning: #92400e;

  --info: #0284c7;
  --info-container: #eff6ff;
  --info-border: #dbeafe;
  --on-info: #1e3a8a;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;

  /* Rounded Borders */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Elevation Shadows */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 2px 4px rgba(15, 23, 42, 0.03);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.06), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
  --shadow-focus: 0 0 0 3px rgba(2, 132, 199, 0.25);

  /* Layout */
  --max-width: 1200px;
  --header-height: 72px;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--canvas);
  color: var(--on-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--neutral-900);
  font-weight: 700;
  line-height: 1.25;
}

h1 {
  font-size: clamp(2rem, 3.8vw, 3rem);
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.5rem, 2.5vw, 2.25rem);
  letter-spacing: -0.025em;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: clamp(1.2rem, 1.8vw, 1.5rem);
  letter-spacing: -0.02em;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

h4 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
  color: var(--neutral-700);
}

p.lead {
  font-size: 1.18rem;
  line-height: 1.7;
  color: var(--neutral-700);
  margin-bottom: 1.5rem;
}

a {
  color: var(--primary-container);
  text-decoration: none;
  transition: color 0.15s ease, text-decoration 0.15s ease;
}

a:hover {
  color: var(--secondary);
  text-decoration: underline;
}

strong {
  font-weight: 700;
  color: var(--neutral-900);
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--neutral-700);
}

li {
  margin-bottom: 0.5rem;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--neutral-100);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  color: var(--primary-container);
  border: 1px solid var(--neutral-200);
}

/* Numeric Tabular figures for telecom numbers */
.num-tabular, .phone-display, .arcep-code {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

@media (max-width: 768px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

.section {
  padding-top: 3.5rem;
  padding-bottom: 3.5rem;
}

.section-hero {
  padding-top: 3rem;
  padding-bottom: 4rem;
  background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
  border-bottom: 1px solid var(--neutral-200);
}

.section-alt {
  background-color: var(--surface);
  border-top: 1px solid var(--neutral-200);
  border-bottom: 1px solid var(--neutral-200);
}

/* 12-Column Grid System */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 2rem;
}

/* 8/4 Asymmetric Split for Official Content & Telemetry Sidebar */
.layout-split {
  display: grid;
  grid-template-columns: 8fr 4fr;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .layout-split {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

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

@media (max-width: 900px) {
  .grid-3, .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* Flex utilities */
.flex {
  display: flex;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }

/* Text Alignment & Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-muted { color: var(--neutral-500); }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }