/* ============================================================================
   Simplif'IA France — Design System v2 · Refined & Modern
   Inspirations: Linear, Vercel, Stripe, Notion · Made in France
   ============================================================================ */

:root {
  /* === Palette principale === */
  --bleu: #000091;
  --bleu-2: #1313B7;
  --bleu-clair: #6A6AF4;
  --bleu-pale: #EEEEFA;
  --bleu-mist: #F5F5FC;
  --bleu-deep: #050530;

  --rouge: #E1000F;
  --rouge-soft: #FFF1F2;
  --rouge-pale: #FEE2E4;

  --vert: #0B7332;
  --vert-soft: #E7F5EC;
  --vert-vif: #00B289;

  --jaune: #F5C518;
  --orange: #F58300;
  --violet: #7C3AED;

  /* === Neutrals === */
  --gris-50: #FAFAFB;
  --gris-100: #F4F4F7;
  --gris-200: #E8E8EE;
  --gris-300: #D4D4DC;
  --gris-400: #A0A0AC;
  --gris-500: #71717A;
  --gris-600: #52525B;
  --gris-700: #3F3F46;
  --gris-800: #27272A;
  --gris-900: #18181B;
  --noir: #09090B;

  /* === Texte === */
  --text: #09090B;
  --text-soft: #52525B;
  --text-mute: #A0A0AC;
  --text-inverse: #FAFAFB;

  /* === Surfaces === */
  --bg: #FFFFFF;
  --bg-soft: #FAFAFB;
  --bg-mute: #F4F4F7;
  --card: #FFFFFF;
  --border: #EBEBF1;
  --border-strong: #D4D4DC;

  /* === Shadows soft layered === */
  --shadow-xs: 0 1px 2px rgba(9, 9, 11, 0.04);
  --shadow-sm: 0 2px 8px rgba(9, 9, 11, 0.04), 0 1px 2px rgba(9, 9, 11, 0.06);
  --shadow-md: 0 8px 24px -8px rgba(9, 9, 11, 0.10), 0 4px 12px -4px rgba(9, 9, 11, 0.06);
  --shadow-lg: 0 24px 48px -12px rgba(9, 9, 11, 0.18), 0 12px 24px -8px rgba(9, 9, 11, 0.08);
  --shadow-xl: 0 32px 64px -16px rgba(9, 9, 11, 0.22), 0 16px 32px -12px rgba(9, 9, 11, 0.12);
  --shadow-glow: 0 0 0 3px rgba(0, 0, 145, 0.12);

  /* === Radius === */
  --r-xs: 6px;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 20px;
  --r-2xl: 28px;
  --r-3xl: 40px;
  --r-full: 999px;

  /* === Typography === */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-serif: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

  /* === Transitions === */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --t-fast: 150ms;
  --t-base: 220ms;
  --t-slow: 400ms;

  /* === Layout === */
  --max-w: 1200px;
  --max-w-sm: 720px;
  --max-w-md: 960px;
  --nav-h: 64px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'cv11', 'ss01';
  text-rendering: optimizeLegibility;
}

::selection { background: var(--bleu); color: white; }

a {
  color: var(--bleu);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease-out);
}
a:hover { color: var(--bleu-clair); }

img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }

/* === Typographie === */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text);
}
h1 { font-size: clamp(36px, 5vw, 56px); letter-spacing: -0.035em; line-height: 1.05; font-weight: 800; }
h2 { font-size: clamp(28px, 3.5vw, 40px); letter-spacing: -0.028em; line-height: 1.1; }
h3 { font-size: 22px; letter-spacing: -0.018em; }
h4 { font-size: 17px; letter-spacing: -0.012em; }

.serif, .accent em { font-family: var(--font-serif); font-style: italic; font-weight: 400; }
.mono { font-family: var(--font-mono); }

/* === Container === */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: var(--max-w-sm); margin: 0 auto; padding: 0 24px; }
.container-md { max-width: var(--max-w-md); margin: 0 auto; padding: 0 24px; }

/* === NAVIGATION === */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 14px max(32px, 5vw);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}

.site-nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.018em;
  color: var(--text);
}
.site-nav-brand:hover { color: var(--text); }

.site-nav-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: linear-gradient(90deg, #0055A4 0% 33.33%, #FFFFFF 33.33% 66.66%, #EF4135 66.66%);
  box-shadow: 0 1px 3px rgba(9, 9, 11, 0.15), inset 0 0 0 0.5px rgba(255, 255, 255, 0.4);
  flex-shrink: 0;
}

.site-nav-links {
  display: flex;
  gap: 4px;
  align-items: center;
}
.site-nav-links a {
  color: var(--text-soft);
  font-weight: 500;
  font-size: 14px;
  padding: 8px 14px;
  border-radius: var(--r-sm);
  transition: all var(--t-fast) var(--ease-out);
}
.site-nav-links a:hover {
  color: var(--text);
  background: var(--gris-100);
}

.site-nav-cta {
  display: flex;
  gap: 8px;
  align-items: center;
}

@media (max-width: 860px) {
  .site-nav-links { display: none; }
  .site-nav { padding: 12px 16px; }
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--r-full);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: -0.005em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--t-base) var(--ease-out);
  white-space: nowrap;
  user-select: none;
  line-height: 1.2;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--noir);
  color: white;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--gris-800);
  transform: translateY(-1px);
  color: white;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16), var(--shadow-md);
}

.btn-marianne {
  background: var(--bleu);
  color: white;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16), var(--shadow-sm);
}
.btn-marianne:hover {
  background: var(--bleu-2);
  transform: translateY(-1px);
  color: white;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
}
.btn-ghost:hover {
  background: var(--gris-100);
  color: var(--text);
}

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border-color: var(--border);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover {
  border-color: var(--border-strong);
  background: var(--gris-50);
  color: var(--text);
}

.btn-lg { padding: 14px 26px; font-size: 15px; }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-xs { padding: 5px 10px; font-size: 12px; }

/* === HERO === */
.hero {
  position: relative;
  padding: clamp(60px, 10vw, 120px) 24px clamp(60px, 8vw, 100px);
  text-align: center;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(106, 106, 244, 0.12), transparent 70%),
    radial-gradient(ellipse 50% 30% at 90% 80%, rgba(225, 0, 15, 0.04), transparent 70%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(9, 9, 11, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(9, 9, 11, 0.022) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 0%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 0%, black 30%, transparent 80%);
  pointer-events: none;
}

.hero > .container,
.hero > * { position: relative; }

.hero h1 {
  max-width: 900px;
  margin: 0 auto 18px;
  font-weight: 800;
}
.hero h1 .accent {
  background: linear-gradient(135deg, var(--bleu) 0%, var(--bleu-clair) 60%, var(--rouge) 110%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero h1 em,
.hero h1 .serif {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: clamp(16px, 1.8vw, 19px);
  color: var(--text-soft);
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.5;
}

.hero-ctas {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  margin-bottom: 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text-soft);
  box-shadow: var(--shadow-xs);
}

@media (max-width: 700px) {
  .hero h1 { font-size: 36px; }
  .hero p { font-size: 16px; }
}

/* === SECTIONS === */
section { padding: clamp(60px, 8vw, 100px) 0; }

/* === CARDS === */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 24px;
  transition: all var(--t-base) var(--ease-out);
}
.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* === BREADCRUMB === */
.breadcrumb {
  font-size: 13px;
  color: var(--text-mute);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--text-soft); }
.breadcrumb a:hover { color: var(--text); }
.breadcrumb strong { color: var(--text); font-weight: 600; }

/* === LEGAL CONTENT === */
.legal-content {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
}
.legal-content h2 {
  margin: 36px 0 14px;
  color: var(--text);
}
.legal-content h3 {
  margin: 28px 0 10px;
  font-size: 17px;
}
.legal-content p { margin-bottom: 16px; }
.legal-content ul {
  margin: 12px 0 16px 24px;
  list-style: disc;
}
.legal-content li { margin-bottom: 8px; }
.legal-content strong { color: var(--text); font-weight: 600; }
.legal-content code {
  background: var(--gris-100);
  padding: 1px 6px;
  border-radius: var(--r-xs);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--bleu);
}

.toc {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 20px 24px;
  margin: 24px 0 32px;
}
.toc h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--text-mute);
  margin-bottom: 12px;
}
.toc ul {
  list-style: none;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px 16px;
}
.toc li { margin: 0; }
.toc a {
  font-size: 13px;
  color: var(--text-soft);
  display: block;
  padding: 4px 0;
}
.toc a:hover { color: var(--bleu); }

/* === FOOTER === */
.site-footer {
  background: var(--gris-50);
  border-top: 1px solid var(--border);
  padding: 64px 24px 24px;
  margin-top: 80px;
}

.site-footer-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
}

.site-footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 12px;
  color: var(--text);
}

.site-footer h4 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-mute);
  margin-bottom: 14px;
}

.site-footer ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.site-footer ul a {
  color: var(--text-soft);
  font-size: 14px;
  transition: color var(--t-fast);
}
.site-footer ul a:hover { color: var(--text); }

.site-footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-mute);
}

@media (max-width: 860px) {
  .site-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .site-footer-bottom {
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
  }
}

/* === GRID UTILITIES === */
.grid-2, .grid-3, .grid-4 {
  display: grid;
  gap: 20px;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 860px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 14px; }
}

.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 24px; }
.mt-6 { margin-top: 48px; }
.mt-8 { margin-top: 64px; }
.text-center { text-align: center; }
.text-soft { color: var(--text-soft); }
.text-mute { color: var(--text-mute); }
.text-small { font-size: 13px; }

/* === KBD === */
kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 6px;
  background: var(--gris-100);
  border: 1px solid var(--border);
  border-radius: var(--r-xs);
  color: var(--text-soft);
  box-shadow: 0 1px 0 var(--border-strong);
}

/* === ACCESSIBILITY === */
:focus-visible {
  outline: 2px solid var(--bleu);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}