/* =========================
   VARIABLES & RESET
   ========================= */

:root {
  /* Couleurs */
  --color-bg: #f9fafb;
  --color-bg-alt: #ffffff;
  --color-text: #111827;
  --color-text-muted: #4b5563;
  --color-border: #e5e7eb;
  --color-accent: #0f766e;
  --color-accent-soft: #ecfdf5;
  --color-footer-bg: #f3f4f6;

  /* Typo */
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  /* Layout */
  --container-width: 70ch;
  --section-spacing: 4rem;
  --section-spacing-lg: 6rem;
  --content-padding-x: 1.5rem;

  /* Divers */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-pill: 999px;
  --transition-fast: 150ms ease-out;
}

/* Box-sizing & reset minimal */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* Suppression du style par défaut des listes */
ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* Liens */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #0b4f4a;
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Accessibilité : réduit les animations si demandé */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* =========================
   LAYOUT GLOBAL
   ========================= */

main {
  padding-inline: var(--content-padding-x);
}

section {
  padding-block: var(--section-spacing);
}

.section-hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.section-services,
.section-approche {
  border-top: 1px solid var(--color-border);
}

/* Conteneur central */
.hero-content,
.section-services > *,
.section-approche > * {
  max-width: var(--container-width);
  margin-inline: auto;
}

/* =========================
   HERO
   ========================= */

.section-hero {
  background-color: var(--color-bg-alt);
}

.hero-content {
  max-width: var(--container-width);
  margin-inline: auto;
}

#hero-title {
  font-size: clamp(2.3rem, 4vw, 2.7rem);
  margin: 0 0 0.5rem;
  letter-spacing: 0.03em;
}

.hero-role {
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
  margin: 0 0 1.5rem;
}

.hero-intro,
.hero-focus {
  margin: 0 0 1rem;
  color: var(--color-text-muted);
}

.hero-focus {
  margin-bottom: 2rem;
}

/* Bouton CTA */
.hero-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  font-size: 0.95rem;
  font-weight: 500;
  background-color: transparent;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.hero-cta:hover {
  background-color: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

.hero-cta:active {
  transform: translateY(0);
}

/* =========================
   TITRES & TEXTE
   ========================= */

h2 {
  font-size: 1.6rem;
  margin: 0 0 0.75rem;
}

h3 {
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
}

.section-intro {
  margin: 0 0 2rem;
  color: var(--color-text-muted);
}

/* =========================
   SERVICES
   ========================= */

.section-services {
  background-color: var(--color-bg);
}

.section-services > h2,
.section-services > .section-intro {
  padding-inline: 0;
}

.services-grid {
  display: grid;
  gap: 1.5rem;
}

.service-item {
  padding: 1.2rem 1.3rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-alt);
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.service-item p {
  margin: 0;
  color: var(--color-text-muted);
}

.service-item:hover {
  border-color: var(--color-accent);
  background-color: #f5fffb;
  transform: translateY(-1px);
}

/* =========================
   APPROCHE ÉCO-CONCEPTION
   ========================= */

.section-approche > h2,
.section-approche > .section-intro {
  padding-inline: 0;
}

.approche-grid {
  display: grid;
  gap: 1.5rem;
}

.approche-item {
  padding: 1.1rem 1.2rem;
  border-radius: var(--radius-md);
  background-color: #f3f4f6;
  border: 1px solid transparent;
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast);
}

.approche-item p {
  margin: 0;
  color: var(--color-text-muted);
}

.approche-item:hover {
  border-color: var(--color-accent);
  background-color: #edf7f6;
}

/* =========================
   BARRE DE CONTACT FIXE
   ========================= */

.contact-sidebar {
  position: fixed;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
}

.contact-sidebar ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.contact-sidebar a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-alt);
  color: var(--color-text);
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.contact-sidebar a:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
  transform: translateY(-1px);
}

.contact-sidebar a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* =========================
   PIED DE PAGE
   ========================= */

.site-footer {
  margin-top: var(--section-spacing);
  padding: 1.25rem var(--content-padding-x);
  background-color: var(--color-footer-bg);
  border-top: 1px solid var(--color-border);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* =========================
   RESPONSIVE
   ========================= */

@media (min-width: 768px) {
  main {
    padding-inline: 3rem;
  }

  section {
    padding-block: var(--section-spacing-lg);
  }

  .services-grid,
  .approche-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .contact-sidebar {
    top: auto;
    bottom: 1.25rem;
    right: 1.25rem;
    transform: none;
  }

  .contact-sidebar ul {
    flex-direction: row;
  }

  .section-hero {
    min-height: 100svh;
    display: flex;
    align-items: center;
    padding-top: 2rem;
    padding-bottom: 2rem;
  }
}