/* ==========================================================================
   Critical CSS — Design System ModernIA
   Palette sobre gris clair + accents émeraude/corail
   ========================================================================== */

/* Design Tokens */
:root {
  /* Couleurs principales */
  --color-primary: #10b981;
  --color-primary-light: #34d399;
  --color-primary-dark: #059669;
  --color-primary-bg: rgba(16, 185, 129, 0.08);
  --color-primary-glow: rgba(16, 185, 129, 0.25);

  /* Couleurs secondaires (CTA) */
  --color-secondary: #f97316;
  --color-secondary-light: #fb923c;
  --color-secondary-dark: #ea580c;
  --color-secondary-glow: rgba(249, 115, 22, 0.3);

  /* Accent */
  --color-accent: #6366f1;
  --color-accent-light: #818cf8;
  --color-accent-bg: rgba(99, 102, 241, 0.08);

  /* Neutres — palette gris sobre */
  --color-text: #111827;
  --color-text-secondary: #374151;
  --color-text-light: #6b7280;
  --color-text-muted: #9ca3af;
  --color-bg: #f3f4f6;
  --color-bg-white: #ffffff;
  --color-bg-elevated: #ffffff;
  --color-bg-dark: #111827;
  --color-bg-darker: #0a0f1a;
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  --color-border-subtle: rgba(0, 0, 0, 0.06);

  /* Glass effect */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-blur: 12px;

  /* Sémantiques */
  --color-success: #059669;
  --color-success-bg: #ecfdf5;
  --color-warning: #d97706;
  --color-warning-bg: #fffbeb;
  --color-danger: #dc2626;
  --color-danger-bg: #fef2f2;
  --color-info: #2563eb;
  --color-info-bg: #eff6ff;

  /* Typographie */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.75rem;
  --font-size-5xl: 3.5rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.05em;

  /* Espacement */
  --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;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Rayons de bordure */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Ombres modernes */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.07), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 40px -10px rgba(0, 0, 0, 0.1), 0 8px 16px -8px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 60px -15px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 20px var(--color-primary-glow);
  --shadow-glow-secondary: 0 0 20px var(--color-secondary-glow);
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.04);

  /* 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: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --max-width: 1280px;
  --sidebar-width: 300px;
  --header-height: 72px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Grain texture subtile sur le body */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.015;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 10000;
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: #fff;
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-secondary);
  outline-offset: 2px;
}

/* ---- Header glassmorphism ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--color-border-subtle);
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: box-shadow var(--transition-base);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-lg);
}

[id] {
  scroll-margin-top: 100px;
}

[id]:target,
[id]:focus {
  outline: none;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.site-logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  letter-spacing: var(--letter-spacing-tight);
}

.site-logo svg {
  filter: drop-shadow(0 2px 4px rgba(16, 185, 129, 0.3));
}

.site-logo:hover svg {
  filter: drop-shadow(0 2px 8px rgba(16, 185, 129, 0.5));
}

.site-logo:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* Navigation */
.main-nav {
  display: none;
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: var(--space-1);
}

.main-nav a {
  color: var(--color-text-light);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.main-nav a:hover {
  color: var(--color-text);
  background: rgba(0, 0, 0, 0.04);
}

.main-nav a[aria-current="page"] {
  color: var(--color-primary-dark);
  background: var(--color-primary-bg);
  font-weight: var(--font-weight-semibold);
}

.main-nav a:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 2px;
}

/* Menu burger */
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.menu-toggle:hover {
  background: rgba(0, 0, 0, 0.05);
}

.menu-toggle:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 2px;
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* ---- Hero section ---- */
.hero {
  padding: var(--space-16) 0 var(--space-10);
  text-align: center;
  position: relative;
}

/* Gradient orb décoratif derrière le hero */
.hero::before {
  content: "";
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, var(--color-primary-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.hero h1 .text-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
}

.hero .hero-cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  margin-top: var(--space-8);
  flex-wrap: wrap;
}

/* Ad slot */
.ad-slot {
  background: var(--color-bg-white);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  min-height: 90px;
  margin: var(--space-6) 0;
}

/* GSAP animation states */
.gsap-reveal {
  opacity: 0;
  transform: translateY(30px);
}

.gsap-reveal-left {
  opacity: 0;
  transform: translateX(-40px);
}

.gsap-reveal-right {
  opacity: 0;
  transform: translateX(40px);
}

.gsap-reveal-scale {
  opacity: 0;
  transform: scale(0.9);
}

/* Espacement réduit sur mobile */
@media (max-width: 767px) {
  .hero {
    padding: var(--space-8) 0 var(--space-6);
  }

  .hero h1 {
    margin-bottom: var(--space-4);
  }

  .ad-slot {
    min-height: 60px;
    margin: var(--space-4) 0;
  }
}

/* Responsive */
@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-8);
  }

  .hero h1 {
    font-size: var(--font-size-5xl);
  }

  .main-nav {
    display: block;
  }

  .menu-toggle {
    display: none;
  }
}

@media (min-width: 1024px) {
  .hero {
    padding: var(--space-24) 0 var(--space-16);
  }
}