/* =============================================
   SRE - CSS Complet Final v2.1
   Site web optimisé avec images et services cliquables
   ============================================= */

/* Reset CSS moderne */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
}

/* Variables CSS (Design System) */
:root {
  /* Identité visuelle */
  --c-primary: #3280a4;
  --c-primary-100: #b8d9e9;
  --c-primary-200: #80bed7;
  --c-primary-300: #5ba7c5;
  --c-primary-700: #266b8c;
  --c-primary-800: #1e5470;
  --c-primary-900: #ffffff;

  /* Couleurs neutres */
  --c-white: #ffffff;
  --c-bg: #ffffff;
  --c-fg: #0f172a;
  --c-muted: #475569;
  --c-border: #e5e7eb;
  --c-surface: #f8fafc;
  --c-surface-2: #f1f5f9;

  /* États et feedback */
  --c-success: #16a34a;
  --c-success-bg: #dcfce7;
  --c-warning: #d97706;
  --c-warning-bg: #fef3c7;
  --c-danger: #dc2626;
  --c-danger-bg: #fef2f2;

  /* Typographie */
  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Consolas', 'Liberation Mono', monospace;

  /* Échelle typographique fluide */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: 1.5rem;
  --fs-3xl: 1.875rem;
  --fs-4xl: 2.25rem;
  --fs-5xl: 3rem;

  /* Titles responsive */
  --fs-h1: clamp(2.25rem, 4vw + 1rem, 3rem);
  --fs-h2: clamp(1.875rem, 3.5vw + 0.5rem, 2.5rem);
  --fs-h3: clamp(1.5rem, 2.5vw + 0.5rem, 2rem);
  --fs-h4: clamp(1.25rem, 2vw + 0.25rem, 1.5rem);

  /* Line heights */
  --lh-tight: 1.25;
  --lh-normal: 1.6;
  --lh-relaxed: 1.75;

  /* Spacing (système 8px) */
  --sp-px: 1px;
  --sp-0: 0;
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-7: 1.75rem;
  --sp-8: 2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;
  --sp-24: 6rem;

  /* Radius */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Ombres */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 8px 10px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 150ms var(--ease-out);
  --transition-base: 250ms var(--ease-out);
  --transition-slow: 350ms var(--ease-out);

  /* Layout */
  --container-xs: 480px;
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-max: 1400px;

  /* Z-index scale */
  --z-hide: -1;
  --z-auto: auto;
  --z-base: 0;
  --z-docked: 10;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-banner: 1030;
  --z-overlay: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* Base styles */
body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--c-fg);
  background: var(--c-bg);
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--sp-4);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--sp-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--sp-8);
  }
}

/* Section spacing */
.section {
  padding: var(--sp-16) 0;
}

.section--sm {
  padding: var(--sp-12) 0;
}

.section--lg {
  padding: var(--sp-24) 0;
}

/* Typography harmonisée */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--lh-tight);
  color: var(--c-primary-700);
  #color: var(--c-fg);
  margin-bottom: var(--sp-4);
  font-family: var(--font-sans);
}

h1 { font-size: var(--fs-h1); font-weight: 700; }
h2 { font-size: var(--fs-h2); font-weight: 600; }
h3 { font-size: var(--fs-h3); font-weight: 600; }
h4 { font-size: var(--fs-h4); font-weight: 600; }
h5 { font-size: var(--fs-xl); font-weight: 600; }
h6 { font-size: var(--fs-lg); font-weight: 600; }

p {
  margin-bottom: var(--sp-4);
}

.lead {
  font-size: var(--fs-lg);
  font-weight: 400;
  color: var(--c-muted);
  line-height: var(--lh-relaxed);
}

.text-sm { font-size: var(--fs-sm); }
.text-xs { font-size: var(--fs-xs); }

/* Links */
a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover,
a:focus {
  color: var(--c-primary-700);
  outline: 2px solid transparent;
}

a:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border);
  z-index: var(--z-sticky);
  transition: all var(--transition-base);
}

.header--scrolled {
  box-shadow: var(--shadow-sm);
  background: rgba(255, 255, 255, 0.98);
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4) 0;
  position: relative;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-weight: 700;
  font-size: var(--fs-lg);
  color: var(--c-primary-700);
  text-decoration: none;
}

.nav__logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--c-primary-200), var(--c-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 900;
  font-size: 1.1rem;
  letter-spacing: -0.025em;
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--sp-2);
  color: var(--c-primary);
  border-radius: var(--radius);
  transition: background-color var(--transition-fast);
}

.nav__toggle:hover {
  background: var(--c-surface);
}

.nav__menu {
  display: flex;
  gap: var(--sp-8);
  list-style: none;
}

.nav__item {
  position: relative;
}

.nav__link {
  padding: var(--sp-2) 0;
  color: var(--c-fg);
  font-weight: 500;
  text-decoration: none;
  position: relative;
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--c-primary);
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link[aria-current="page"] {
  color: var(--c-primary);
}

.nav__link:hover::after,
.nav__link[aria-current="page"]::after {
  width: 100%;
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }

  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-white);
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--c-border);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    box-shadow: var(--shadow-lg);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-dropdown);
  }

  .nav__menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav__link {
    display: block;
    padding: var(--sp-4);
    border-bottom: 1px solid var(--c-border);
  }

  .nav__link:last-child {
    border-bottom: none;
  }
}

/* Hero Section - Amélioré avec dégradé et hauteur réduite */
.hero {
  background: linear-gradient(180deg, #e0f2f8 0%, var(--c-primary-200) 30%, var(--c-primary) 100%);
  color: white;
  text-align: center;
  padding: var(--sp-12) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='4'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
  opacity: 0.2;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero__title {
  font-size: var(--fs-h1);
  margin-bottom: var(--sp-5);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-primary-800);
  text-shadow: 0 2px 4px rgba(255, 255, 255, 0.3);
}

.hero__subtitle {
  font-size: var(--fs-lg);
  margin-bottom: var(--sp-8);
  color: var(--c-primary-900);
  line-height: var(--lh-relaxed);
  font-weight: 400;
}

.hero__actions {
  display: flex;
  gap: var(--sp-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-weight: 600;
  font-size: var(--fs-base);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn:focus {
  outline: 2px solid transparent;
  outline-offset: 2px;
}

.btn:focus-visible {
  outline: 2px solid currentColor;
}

.btn--primary {
  background: var(--c-white);
  color: var(--c-primary);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background: var(--c-surface);
}

.btn--outline {
  background: transparent;
  color: var(--c-white);
  border-color: var(--c-white);
}

.btn--outline:hover {
  background: var(--c-white);
  color: var(--c-primary);
}

.btn--secondary {
  background: var(--c-primary);
  color: white;
}

.btn--secondary:hover {
  background: var(--c-primary-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--ghost {
  background: transparent;
  color: var(--c-primary);
  border-color: transparent;
}

.btn--ghost:hover {
  background: var(--c-surface);
}

.btn--sm {
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--fs-sm);
}

.btn--lg {
  padding: var(--sp-4) var(--sp-8);
  font-size: var(--fs-lg);
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--sp-6);
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

@media (min-width: 1024px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Cards de base */
.card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--sp-6);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card--surface {
  background: var(--c-surface);
}

.card--featured {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-md);
}

.card--featured::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-primary-200), var(--c-primary));
}

/* =============================================
   CARTES DE SERVICES - OPTIMISÉES
   ============================================= */

.service-card {
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 100%;
  cursor: pointer;
}

.service-card__link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.service-card__image {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: linear-gradient(135deg, var(--c-primary-200), var(--c-primary));
}

.service-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.service-card__image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(50,128,164,0.15), rgba(50,128,164,0.35));
  transition: background var(--transition-base);
}

.service-card__body {
  padding: var(--sp-6);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.service-card__title {
  margin-bottom: var(--sp-3);
  color: var(--c-primary-700);
  font-size: var(--fs-xl);
  font-weight: 600;
}

.service-card__title a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.service-card__title a:hover {
  color: var(--c-primary);
}

.service-card__description {
  margin-bottom: var(--sp-5);
  color: var(--c-muted);
  flex: 1;
  line-height: var(--lh-relaxed);
}

/* Effets hover pour les cartes de services */
.service-card:hover .service-card__image img {
  transform: scale(1.05);
}

.service-card:hover .service-card__image::after {
  background: linear-gradient(180deg, rgba(50,128,164,0.20), rgba(50,128,164,0.45));
}

.service-card:hover .service-card__title {
  color: var(--c-primary);
}

/* Forms */
.form {
  display: grid;
  gap: var(--sp-5);
  max-width: 600px;
}

.form-group {
  display: grid;
  gap: var(--sp-2);
}

.form-label {
  font-weight: 600;
  color: var(--c-fg);
  font-size: var(--fs-sm);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--sp-3) var(--sp-4);
  border: 2px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-white);
  font-family: inherit;
  font-size: var(--fs-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(50, 128, 164, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--c-muted);
}

.form-error {
  color: var(--c-danger);
  font-size: var(--fs-sm);
  margin-top: var(--sp-1);
}

.form-success {
  color: var(--c-success);
  font-weight: 600;
  padding: var(--sp-3);
  background: var(--c-success-bg);
  border: 1px solid var(--c-success);
  border-radius: var(--radius);
}

.form-error-message {
  color: var(--c-danger);
  font-weight: 600;
  padding: var(--sp-3);
  background: var(--c-danger-bg);
  border: 1px solid var(--c-danger);
  border-radius: var(--radius);
}

/* About Section */
.about {
  background: var(--c-surface);
}

.about__content {
  display: grid;
  gap: var(--sp-10);
  align-items: center;
}

@media (min-width: 900px) {
  .about__content {
    grid-template-columns: 1.2fr 1fr;
  }
}

.about__text h2 {
  color: var(--c-primary-700);
  margin-bottom: var(--sp-6);
}

.about__text h3 {
  color: var(--c-primary);
  margin: var(--sp-6) 0 var(--sp-3);
  font-size: var(--fs-xl);
}

.about__text p {
  color: var(--c-muted);
  margin-bottom: var(--sp-4);
}

.about__highlight {
  font-style: italic;
  color: var(--c-primary-700);
  font-weight: 500;
  font-size: var(--fs-lg);
  margin: var(--sp-6) 0;
  padding: var(--sp-5);
  background: rgba(50, 128, 164, 0.05);
  border-left: 4px solid var(--c-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.about__image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  max-width: 400px;
  justify-self: center;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--c-surface), var(--c-border));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--c-muted);
}

.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about__image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(50,128,164,0.1), rgba(50,128,164,0.2));
}

/* Values List */
.values-list {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-6);
}

.values-item {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
}

.values-icon {
  width: 24px;
  height: 24px;
  background: var(--c-primary-200);
  border-radius: var(--radius-full);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.values-icon::after {
  content: '✓';
  color: var(--c-primary-700);
  font-weight: bold;
  font-size: 0.75rem;
}

.values-text {
  flex: 1;
}

.values-text strong {
  color: var(--c-primary-700);
  font-weight: 600;
}

/* Footer */
.footer {
  background: var(--c-fg);
  color: white;
  text-align: center;
  padding: var(--sp-10) 0;
  margin-top: var(--sp-20);
}

.footer a {
  color: var(--c-primary-200);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer a:hover {
  color: white;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s var(--ease-out);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: all 0.6s var(--ease-out);
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: all 0.6s var(--ease-out);
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--sp-2); }
.mb-4 { margin-bottom: var(--sp-4); }
.mb-6 { margin-bottom: var(--sp-6); }
.mb-8 { margin-bottom: var(--sp-8); }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--sp-2); }
.mt-4 { margin-top: var(--sp-4); }
.mt-6 { margin-top: var(--sp-6); }
.mt-8 { margin-top: var(--sp-8); }

.hidden { display: none; }
.invisible { visibility: hidden; }

/* Honeypot (anti-spam) */
.hp {
  position: absolute;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
}

/* =============================================
   RESPONSIVE DESIGN AVANCÉ
   ============================================= */

/* Petits écrans */
@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
    align-items: center;
  }
  
  .grid--4 {
    grid-template-columns: 1fr;
  }
  
  .service-card__image {
    aspect-ratio: 4/3;
  }
}

/* Tablettes */
@media (min-width: 481px) and (max-width: 768px) {
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Écrans moyens */
@media (min-width: 769px) and (max-width: 1023px) {
  .grid--4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/*