/*
 * Thème de design : L'Élégance Parisienne - Site de luxe pour GC ARMATURES
 * Palette de couleurs :
 * - Noir Profond (Deep Noir): #050505
 * - Soie Ivoire (Ivory Silk): #F9F9F9
 * - Or Royal (Royal Gold): #D4AF37
 * - Gris Anthracite: #1C1C1E
 * - Blanc Pur: #FFFFFF
 */

/* ============================================
   VARIABLES CSS & THÈME
   ============================================ */
:root {
  /* Palette principale - Mode Clair */
  --color-noir-profond: #050505;
  --color-soie-ivoire: #F9F9F9;
  --color-or-royal: #D4AF37;
  --color-gris-anthracite: #1C1C1E;
  --color-blanc-pur: #FFFFFF;
  --color-gris-clair: #E8E8E8;
  --color-gris-moyen: #9A9A9A;
  --color-or-clair: #E5C769;
  --color-or-fonce: #B8962E;

  /* Typographie */
  --font-primary: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
  --font-secondary: 'Lato', 'Segoe UI', Tahoma, sans-serif;
  --font-display: 'Didot', 'Bodoni MT', 'Times New Roman', serif;

  /* Espacement */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Bordures */
  --border-thin: 0.5px;
  --border-thin-gold: 0.5px solid var(--color-or-royal);
  --border-radius: 2px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-luxury: 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* Ombres */
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-elegant: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-luxury: 0 8px 40px rgba(0, 0, 0, 0.12);

  /* Z-index */
  --z-header: 1000;
  --z-dropdown: 999;
  --z-modal: 2000;
  --z-overlay: 1999;
}

/* Mode Sombre */
[data-theme="dark"] {
  --color-soie-ivoire: #0A0A0A;
  --color-gris-clair: #1A1A1A;
  --color-blanc-pur: #050505;
  --color-gris-moyen: #6A6A6A;
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-secondary);
  background-color: var(--color-blanc-pur);
  color: var(--color-noir-profond);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

/* ============================================
   TYPOGRAPHIE
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: var(--color-noir-profond);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

p {
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
  line-height: 1.8;
}

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

a:hover {
  color: var(--color-or-fonce);
}

/* ============================================
   EN-TÊTE (HEADER)
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: var(--z-header);
  background-color: transparent;
  transition: background-color var(--transition-smooth), box-shadow var(--transition-smooth);
  padding: var(--spacing-md) 0;
}

.header.scrolled {
  background-color: rgba(249, 249, 249, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-subtle);
  padding: var(--spacing-sm) 0;
}

[data-theme="dark"] .header.scrolled {
  background-color: rgba(10, 10, 10, 0.95);
}

.header__container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
}

.header__logo img {
  width: 232px;
  height: auto;
  max-height: 70px;
  object-fit: contain;
  transition: transform var(--transition-smooth);
}

.header__logo img:hover {
  transform: scale(1.02);
}

.header__logo-text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-noir-profond);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.header__logo-text span {
  color: var(--color-or-royal);
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
}

.nav__list {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  align-items: center;
}

.nav__link {
  position: relative;
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-noir-profond);
  padding: var(--spacing-xs) 0;
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-or-royal);
  transition: width var(--transition-smooth);
}

.nav__link:hover {
  color: var(--color-or-royal);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__icon {
  font-size: 1.25rem;
  vertical-align: middle;
  margin-right: var(--spacing-xs);
}

/* Header Actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
  justify-content: flex-end;
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-noir-profond);
  transition: color var(--transition-fast);
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.theme-toggle:hover {
  color: var(--color-or-royal);
  background-color: var(--color-gris-clair);
}

.theme-toggle__icon {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  justify-content: center;
  align-items: center;
}

.mobile-menu-btn__line {
  width: 24px;
  height: 1px;
  background-color: var(--color-noir-profond);
  transition: all var(--transition-smooth);
  transform-origin: center;
}

.mobile-menu-btn.active .mobile-menu-btn__line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .mobile-menu-btn__line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active .mobile-menu-btn__line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   MOBILE MENU
   ============================================ */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: var(--color-blanc-pur);
  z-index: var(--z-modal);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-smooth), visibility var(--transition-smooth);
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__close {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--color-noir-profond);
  cursor: pointer;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-menu__nav {
  text-align: center;
}

.mobile-menu__list {
  list-style: none;
}

.mobile-menu__item {
  margin: var(--spacing-lg) 0;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-smooth);
}

.mobile-menu.active .mobile-menu__item {
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu__link {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-noir-profond);
  text-decoration: none;
  letter-spacing: 0.1em;
  transition: color var(--transition-fast);
}

.mobile-menu__link:hover {
  color: var(--color-or-royal);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-top: 0;
}

.hero__media {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero__media::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.3);
  z-index: 2;
}

.hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: blur(3px);
  transform: scale(1.05);
}

.hero__content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: var(--spacing-2xl);
  max-width: 900px;
  animation: fadeInUp 1s ease-out;
}

.hero__title {
  color: var(--color-blanc-pur);
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero__subtitle {
  color: var(--color-soie-ivoire);
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  font-family: var(--font-primary);
  font-weight: 300;
  letter-spacing: 0.05em;
}

.hero__cta {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--color-or-royal);
  color: var(--color-blanc-pur);
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border: var(--border-thin-gold);
  transition: all var(--transition-smooth);
  cursor: pointer;
}

.hero__cta:hover {
  background-color: var(--color-or-fonce);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(212, 175, 55, 0.3);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   SECTIONS GÉNÉRALES
   ============================================ */
.section {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

.section--dark {
  background-color: var(--color-gris-anthracite);
  color: var(--color-blanc-pur);
}

.section--light {
  background-color: var(--color-soie-ivoire);
}

.section--with-bg {
  position: relative;
  overflow: hidden;
}

.section__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: blur(3px);
  z-index: 0;
}

.section__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(5, 5, 5, 0.7);
  z-index: 1;
}

.section__content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section__header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section__title {
  position: relative;
  display: inline-block;
  margin-bottom: var(--spacing-md);
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 1px;
  background-color: var(--color-or-royal);
}

.section--dark .section__title {
  color: var(--color-blanc-pur);
}

/* ============================================
   CARTES & GRILLES
   ============================================ */
.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card {
  background-color: var(--color-blanc-pur);
  padding: var(--spacing-xl);
  border: var(--border-thin-gold);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-or-royal), transparent);
  transform: scaleX(0);
  transition: transform var(--transition-smooth);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-luxury);
}

.card:hover::before {
  transform: scaleX(1);
}

.card__icon {
  width: 50px;
  height: 50px;
  margin-bottom: var(--spacing-md);
  color: var(--color-or-royal);
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.card__text {
  color: var(--color-gris-moyen);
  line-height: 1.8;
}

.section--dark .card {
  background-color: var(--color-gris-anthracite);
  border-color: rgba(212, 175, 55, 0.3);
}

.section--dark .card__title,
.section--dark .card__text {
  color: var(--color-blanc-pur);
}

/* ============================================
   BOUTONS
   ============================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
  cursor: pointer;
  border: var(--border-thin-gold);
  transition: all var(--transition-smooth);
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-or-royal);
  color: var(--color-blanc-pur);
}

.btn--primary:hover {
  background-color: var(--color-or-fonce);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(212, 175, 55, 0.3);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-or-royal);
}

.btn--outline:hover {
  background-color: var(--color-or-royal);
  color: var(--color-blanc-pur);
}

.btn--white {
  background-color: var(--color-blanc-pur);
  color: var(--color-noir-profond);
}

.btn--white:hover {
  background-color: var(--color-or-royal);
  color: var(--color-blanc-pur);
}

/* ============================================
   FORMULAIRES
   ============================================ */
.form {
  max-width: 600px;
  margin: 0 auto;
}

.form__group {
  margin-bottom: var(--spacing-lg);
}

.form__label {
  display: block;
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-noir-profond);
  margin-bottom: var(--spacing-xs);
}

.form__input,
.form__textarea,
.form__select {
  width: 100%;
  padding: var(--spacing-md);
  font-family: var(--font-secondary);
  font-size: 1rem;
  color: var(--color-noir-profond);
  background-color: var(--color-blanc-pur);
  border: var(--border-thin-gold);
  transition: all var(--transition-fast);
}

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
  outline: none;
  border-color: var(--color-or-royal);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.form__textarea {
  min-height: 150px;
  resize: vertical;
}

/* ============================================
   PIED DE PAGE (FOOTER)
   ============================================ */
.footer {
  background-color: var(--color-noir-profond);
  color: var(--color-gris-moyen);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.footer__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-or-royal);
  margin-bottom: var(--spacing-md);
}

.footer__text {
  line-height: 1.8;
  margin-bottom: var(--spacing-sm);
}

.footer__link {
  color: var(--color-gris-moyen);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-or-royal);
}

.footer__contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.footer__contact-icon {
  width: 20px;
  height: 20px;
  color: var(--color-or-royal);
  flex-shrink: 0;
}

.footer__bottom {
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  padding-top: var(--spacing-lg);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  font-size: 0.875rem;
}

/* ============================================
   ACCESSIBILITÉ
   ============================================ */
.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;
}

:focus-visible {
  outline: 2px solid var(--color-or-royal);
  outline-offset: 2px;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-or-royal);
  color: var(--color-blanc-pur);
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: 9999;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 992px) {
  .nav {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .header__logo img {
    width: 180px;
  }

  h1 { font-size: clamp(2rem, 5vw, 3rem); }
  h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }

  .grid--2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

  .hero__content {
    padding: var(--spacing-lg);
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer__legal {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .header__actions {
    gap: var(--spacing-sm);
  }

  .card {
    padding: var(--spacing-lg);
  }
}

/* ============================================
   UTILITAIRES
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.pt-1 { padding-top: var(--spacing-sm); }
.pt-2 { padding-top: var(--spacing-md); }
.pt-3 { padding-top: var(--spacing-lg); }
.pt-4 { padding-top: var(--spacing-xl); }

.pb-1 { padding-bottom: var(--spacing-sm); }
.pb-2 { padding-bottom: var(--spacing-md); }
.pb-3 { padding-bottom: var(--spacing-lg); }
.pb-4 { padding-bottom: var(--spacing-xl); }

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-gris-clair);
}

::-webkit-scrollbar-thumb {
  background: var(--color-or-royal);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-or-fonce);
}

/* Selection */
::selection {
  background-color: var(--color-or-royal);
  color: var(--color-blanc-pur);
}