/* ============================================================================
   Header & Navigation Styles
   ============================================================================ */

/* Header Container */
.ef-header {
  position: relative;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--space-4) var(--space-6);
  box-shadow: var(--shadow-xs);
}

.ef-header__inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

/* Logo / Brand */
.ef-header__brand {
  flex-shrink: 0;
}

.ef-header__logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 700;
  font-size: var(--font-size-xl);
  transition: color var(--transition-base);
}

.ef-header__logo-link:hover {
  color: var(--color-primary);
}

.ef-header__logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-surface);
  font-size: 1.2rem;
}

.ef-header__logo-text {
  font-family: var(--font-heading);
  text-transform: lowercase;
  letter-spacing: -0.5px;
}

/* Navigation */
.ef-header__nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.ef-header__nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-wrap: wrap;
  justify-content: center;
}

.ef-header__nav-item {
  position: relative;
  white-space: nowrap;
}

.ef-header__nav-link {
  display: block;
  padding: var(--space-4) var(--space-5);
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--font-size-base);
  font-weight: 500;
  transition: color var(--transition-base);
  position: relative;
}

.ef-header__nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-5);
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.ef-header__nav-link:hover {
  color: var(--color-primary);
}

.ef-header__nav-link:hover::after {
  width: calc(100% - var(--space-10));
}

.ef-header__nav-link.active {
  color: var(--color-primary);
  font-weight: 600;
}

.ef-header__nav-link.active::after {
  width: calc(100% - var(--space-10));
  background-color: var(--color-primary);
}

/* CTA Button */
.ef-header__nav-link--cta {
  background-color: var(--color-primary);
  color: var(--color-surface);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  font-size: var(--font-size-sm);
  letter-spacing: 0.5px;
  padding: var(--space-3) var(--space-6);
  margin-left: var(--space-4);
  transition: background-color var(--transition-base), transform var(--transition-base);
}

.ef-header__nav-link--cta:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-surface);
  transform: translateY(-1px);
}

.ef-header__nav-link--cta::after {
  display: none;
}

/* Toggle Button (Burger Menu) */
.ef-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 24px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  margin: 0;
  transition: all var(--transition-base);
}

.ef-header__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: var(--radius-xs);
  transition: all var(--transition-base);
  transform-origin: center;
}

.ef-header__toggle:hover span {
  background-color: var(--color-primary);
}

.ef-header__toggle.is-open span:nth-child(1) {
  transform: translateY(11px) rotate(45deg);
}

.ef-header__toggle.is-open span:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}

.ef-header__toggle.is-open span:nth-child(3) {
  transform: translateY(-11px) rotate(-45deg);
}

/* ============================================================================
   Mobile Menu (max-width: 900px)
   ============================================================================ */

@media (max-width: 900px) {
  .ef-header__inner {
    gap: var(--space-4);
  }

  .ef-header__toggle {
    display: flex;
  }

  .ef-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-gray-200);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
  }

  .ef-header__nav.is-open {
    max-height: 500px;
    box-shadow: var(--shadow-sm);
  }

  .ef-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-4) 0;
    justify-content: flex-start;
  }

  .ef-header__nav-item {
    width: 100%;
  }

  .ef-header__nav-link {
    display: block;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-gray-100);
  }

  .ef-header__nav-link::after {
    display: none;
  }

  .ef-header__nav-link:hover {
    background-color: var(--color-primary-soft);
  }

  .ef-header__nav-link.active {
    background-color: var(--color-primary-soft);
    border-left: 3px solid var(--color-primary);
    padding-left: calc(var(--space-6) - 3px);
  }

  .ef-header__nav-link--cta {
    background-color: var(--color-primary);
    color: var(--color-surface);
    border-radius: 0;
    margin: var(--space-3) var(--space-6) 0;
    border: none;
    padding: var(--space-4) var(--space-5);
  }

  .ef-header__nav-link--cta:hover {
    background-color: var(--color-primary-dark);
  }
}

@media (max-width: 600px) {
  .ef-header {
    padding: var(--space-3) var(--space-4);
  }

  .ef-header__inner {
    gap: var(--space-3);
  }

  .ef-header__logo-link {
    font-size: var(--font-size-lg);
  }

  .ef-header__logo-mark {
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }

  .ef-header__nav-link {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
  }
}