/* ==========================================================================
   Carbon Saver — Homepage + Header + Footer Styles
   ========================================================================== */

/* ── HEADER ── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  transition: background var(--transition-base), backdrop-filter var(--transition-base);
}

.header--scrolled {
  background: rgba(15, 35, 31, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header__topbar {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
}

.header__topbar-content {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: var(--space-md);
}

.nav {
  padding: var(--space-md) 0;
}

.nav__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  color: var(--color-text-light);
  text-decoration: none;
}

.nav__logo:hover {
  color: var(--color-text-light);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-light);
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
}

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

/* Dropdown */
.nav__dropdown {
  position: relative;
}

.nav__dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-light);
  cursor: pointer;
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
}

.nav__dropdown-trigger:hover {
  color: var(--color-primary);
}

.nav__dropdown-trigger svg {
  transition: transform var(--transition-fast);
}

.nav__dropdown--open .nav__dropdown-trigger svg {
  transform: rotate(180deg);
}

.nav__dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 200px;
  background: var(--color-bg-medium);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-sm);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-lg);
}

.nav__dropdown--open .nav__dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav__dropdown-menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-sm);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav__dropdown-menu a:hover {
  background: rgba(223, 254, 161, 0.1);
  color: var(--color-primary);
}

/* Language Selector */
.lang-select {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-light);
  background: transparent;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  padding-right: 24px;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 12 12' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%23818D8A' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
}

.lang-select option {
  background: var(--color-bg-medium);
  color: var(--color-text-light);
}

/* Mobile Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
  background: none;
  border: none;
  cursor: pointer;
}

.nav__toggle span {
  display: block;
  height: 2px;
  background: var(--color-text-light);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.nav__toggle--open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle--open span:nth-child(2) {
  opacity: 0;
}

.nav__toggle--open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ── HERO ── */
.hero {
  padding-top: calc(var(--space-5xl) + 100px);
  min-height: 85vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at 50% 30%, rgba(44, 67, 62, 0.5) 0%, transparent 70%);
  pointer-events: none;
}

.hero__badge {
  margin-bottom: var(--space-xl);
}

.hero__title {
  margin-bottom: var(--space-lg);
  max-width: 900px;
  margin-inline: auto;
}

.hero__subtitle {
  font-size: var(--fs-lg);
  color: var(--color-text-muted);
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
}

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

/* ── INTRO ── */
.intro__grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-3xl);
  align-items: start;
}

.intro__heading {
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  color: var(--color-text-muted);
  line-height: var(--lh-normal);
}

.intro__text {
  font-size: var(--fs-xl);
  line-height: var(--lh-loose);
}

/* ── FEATURES ── */
.features__header {
  margin-bottom: var(--space-2xl);
}

.features__tab-list {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  overflow-x: auto;
  padding-bottom: var(--space-sm);
}

.features__tab {
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
  background: transparent;
}

.features__tab:hover,
.features__tab.active {
  background: var(--color-primary);
  color: var(--color-primary-text);
  border-color: var(--color-primary);
}

.features__panel-content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-3xl);
}

.features__panel-content h3 {
  margin-bottom: var(--space-md);
}

.features__panel-content p {
  color: var(--color-text-muted);
  font-size: var(--fs-md);
  margin-bottom: var(--space-xl);
  max-width: 640px;
}

/* ── SECTORS ── */
.sectors__header {
  margin-bottom: var(--space-2xl);
}

.sectors__subtitle {
  color: var(--color-text-muted);
  max-width: 700px;
  margin-inline: auto;
  margin-top: var(--space-md);
}

.sectors__card {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
}

.sectors__icon {
  margin-bottom: var(--space-lg);
}

.sectors__card h3 {
  margin-bottom: var(--space-sm);
}

/* ── CASE STUDIES ── */
.cases__grid {
  margin-top: var(--space-2xl);
}

.cases__card h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.cases__card p {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
}

/* ── PRICING ── */
.pricing__grid {
  margin-top: var(--space-2xl);
  max-width: 800px;
  margin-inline: auto;
}

.pricing__badge {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.pricing__card h3 {
  margin-bottom: var(--space-md);
}

.pricing__desc {
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
}

.pricing__card--featured {
  border-color: var(--color-primary);
  position: relative;
}

.pricing__card--featured::before {
  content: 'Recommandé';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-primary-text);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  padding: 4px 16px;
  border-radius: var(--radius-full);
}

/* ── MISSION ── */
.mission {
  color: var(--color-primary-text);
}

.mission__tagline {
  font-size: var(--fs-3xl);
  margin-top: var(--space-md);
  margin-bottom: var(--space-3xl);
}

.mission__values {
  margin-top: var(--space-2xl);
}

.mission__value h3 {
  margin-bottom: var(--space-sm);
}

.mission__value p {
  opacity: 0.8;
}

/* ── NEWSLETTER ── */
.newsletter__form {
  display: flex;
  gap: var(--space-sm);
  max-width: 480px;
  margin: var(--space-xl) auto 0;
}

.newsletter__form input {
  flex: 1;
  padding: 0.875rem 1.25rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-light);
  font-size: var(--fs-base);
}

.newsletter__form input::placeholder {
  color: var(--color-text-muted);
}

.newsletter__form input:focus {
  border-color: var(--color-primary);
  outline: 2px solid rgba(223, 254, 161, 0.2);
}

/* ── FOOTER ── */
.footer {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

.footer__desc {
  margin-top: var(--space-md);
  font-size: var(--fs-sm);
  max-width: 280px;
}

.footer__col h4 {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-lg);
  color: var(--color-text-light);
}

.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__col a {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer__col a:hover {
  color: var(--color-primary);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.footer__legal {
  display: flex;
  gap: var(--space-sm);
}

.footer__legal a {
  color: var(--color-text-muted);
}

.footer__legal a:hover {
  color: var(--color-primary);
}

/* ── FAQ ── */
.faq__item {
  border-bottom: 1px solid var(--color-border);
}

.faq__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-lg) 0;
  font-size: var(--fs-md);
  font-weight: var(--fw-medium);
  text-align: left;
  cursor: pointer;
}

.faq__question::after {
  content: '+';
  font-size: var(--fs-xl);
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.faq__item--open .faq__question::after {
  content: '−';
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq__item--open .faq__answer {
  max-height: 300px;
}

.faq__answer p {
  padding-bottom: var(--space-lg);
  color: var(--color-text-muted);
}

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .intro__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

@media (max-width: 768px) {
  .header__topbar { display: none; }

  .nav__toggle { display: flex; }

  .nav__menu {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--color-bg-dark);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-xl);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-overlay);
  }

  .nav__menu--open {
    opacity: 1;
    visibility: visible;
  }

  .nav__dropdown-menu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: transparent;
    border: none;
    box-shadow: none;
    padding: var(--space-sm) 0;
    display: none;
  }

  .nav__dropdown--open .nav__dropdown-menu {
    display: block;
    transform: none;
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--space-3xl) + 80px);
    padding-bottom: var(--space-3xl);
  }

  .intro__text {
    font-size: var(--fs-md);
  }

  .features__tab-list {
    gap: var(--space-xs);
  }

  .features__panel-content {
    padding: var(--space-xl);
  }

  .newsletter__form {
    flex-direction: column;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}