/* ==========================================================================
   FONDATION VERDE — Version Django (thèmes dynamiques)
   Design System & Feuille de Styles - /nouv/
   ========================================================================== */

/* --- 1. Variables & Design Tokens --- */
:root {
  /* Valeurs par défaut (thème Émeraude) — surchargées dynamiquement par Django. */
  --c-primary: #1E4D3B;
  --c-primary-deep: #163B2C;
  --c-primary-darkest: var(--c-primary-darkest);
  --c-secondary: #2F6F56;
  --c-secondary-light: #5E9C83;
  --c-secondary-soft: #8EBAA8;
  --c-bg: #FAF6EE;
  --c-bg-alt: #F4EFE6;
  --c-surface: #FFFFFF;
  --c-surface-tint: #EBF3EF;
  --c-accent: #B88E3E;
  --c-accent-dark: var(--c-accent-dark);
  --c-accent-light: #FBF4E6;
  --c-text-dark: #14201A;
  --c-text-body: #2D3D35;
  --c-text-muted: #586E63;
  --c-text-inverse: #FFFFFF;
  --rgb-primary: 30, 77, 59;
  --rgb-primary-deep: 22, 59, 44;
  --rgb-secondary: 47, 111, 86;
  --rgb-secondary-light: 94, 156, 131;
  --rgb-bg: 250, 246, 238;
  --rgb-text-dark: 20, 32, 26;
  --font-heading: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --heading-scale: 1;

  --c-ghost: rgba(var(--rgb-secondary), 0.08);
  --c-border: rgba(var(--rgb-primary), 0.12);
  --c-border-light: rgba(var(--rgb-primary), 0.06);

  --shadow-xs: 0 1px 3px rgba(var(--rgb-text-dark), 0.05);
  --shadow-card: 0 10px 30px -5px rgba(var(--rgb-text-dark), 0.06), 0 4px 12px -2px rgba(var(--rgb-text-dark), 0.03);
  --shadow-hover: 0 20px 40px -10px rgba(var(--rgb-primary), 0.14), 0 8px 16px -4px rgba(var(--rgb-primary), 0.06);
  --shadow-glow: 0 0 40px rgba(var(--rgb-secondary), 0.18);

  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
}

/* --- 2. Reset & Bases --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--c-bg);
  color: var(--c-text-body);
  line-height: 1.65;
  font-weight: 400;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img, svg {
  display: block;
  max-width: 100%;
}

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

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* --- 3. Utilitaires de Layout --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding: 6rem 0;
  position: relative;
}

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

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-primary);
  background-color: var(--c-ghost);
  padding: 0.35rem 0.95rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: calc(2.85rem * var(--heading-scale));
  line-height: 1.15;
  color: var(--c-primary-deep);
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--c-text-muted);
  font-weight: 400;
}

/* --- 4. Boutons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.875rem 1.85rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--c-primary);
  color: var(--c-text-inverse);
  box-shadow: 0 4px 15px rgba(var(--rgb-primary), 0.25);
}

.btn-primary:hover {
  background-color: var(--c-primary-deep);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(var(--rgb-primary), 0.35);
}

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

.btn-outline:hover {
  background-color: var(--c-ghost);
  color: var(--c-primary-deep);
  transform: translateY(-2px);
}

.btn-gold {
  background-color: var(--c-accent);
  color: #FFFFFF;
}

.btn-gold:hover {
  background-color: var(--c-accent-dark);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.6rem 1.25rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1.05rem 2.25rem;
  font-size: 1.0625rem;
}

/* --- 5. Navigation / Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(var(--rgb-bg), 0.90);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-border);
  transition: all var(--transition-normal);
}

.site-header.scrolled {
  background-color: rgba(var(--rgb-bg), 0.98);
  box-shadow: var(--shadow-card);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-mark {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--c-secondary), var(--c-primary-deep));
  color: #FFFFFF;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(var(--rgb-primary), 0.2);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: calc(1.35rem * var(--heading-scale));
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-primary-deep);
  line-height: 1.1;
}

.brand-sub {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-text-muted);
  font-weight: 600;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--c-text-body);
  position: relative;
  padding: 0.25rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--c-secondary);
  transition: width var(--transition-fast);
}

.nav-link:hover {
  color: var(--c-primary-deep);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--c-primary-deep);
  cursor: pointer;
  padding: 0.5rem;
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 80px;
  left: 0;
  right: 0;
  background-color: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: var(--shadow-hover);
  transform: translateY(-110%);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
  z-index: 999;
}

.mobile-drawer.active {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer .nav-link {
  font-size: 1.125rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--c-border-light);
}