/* KidMindIO Header Styles - builds on base.css */

.km-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(250, 251, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(176, 190, 222, 0.35);
}

.km-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.km-header__brand {
  display: flex;
  align-items: center;
  min-width: 0;
}

.km-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.km-header__logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 14px;
  background: radial-gradient(circle at 30% 30%, #ffeef6 0, #f7d5ff 32%, #c9d9ff 68%, #b5cffc 100%);
  box-shadow: 0 4px 10px rgba(149, 157, 255, 0.35);
}

.km-header__site-name {
  font-family: "Playfair Display", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #1b2340;
}

.km-header__nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1.75rem;
}

.km-header__nav-list {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.km-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0;
  font-family: "Nunito", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: #3b4463;
  text-decoration: none;
}

.km-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.15rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #f5a7c7, #9fb6ff);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.18s ease-out;
}

.km-header__nav-link:hover::after,
.km-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

.km-header__nav-link:focus-visible {
  outline: 2px solid #7f8dff;
  outline-offset: 3px;
  border-radius: 4px;
}

.km-header__cta-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.km-header__cta-primary,
.km-header__cta-secondary {
  font-family: "Nunito", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 0.4rem 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
}

.km-header__cta-primary {
  background: linear-gradient(135deg, #f9a8d4, #a5b4fc);
  color: #18181b!important;
  box-shadow: 0 8px 18px rgba(148, 163, 255, 0.45);
}

.km-header__cta-primary:hover {
  filter: brightness(1.05);
}

.km-header__cta-primary:focus-visible {
  outline: 2px solid #4f46e5;
  outline-offset: 2px;
}

.km-header__cta-secondary {
  background: transparent;
  color: #374151;
  border-color: rgba(148, 163, 255, 0.6);
}

.km-header__cta-secondary:hover {
  background: rgba(191, 219, 254, 0.3);
}

.km-header__cta-secondary:focus-visible {
  outline: 2px solid #4f46e5;
  outline-offset: 2px;
}

/* Mobile Menu Toggle */
button.km-header__menu-toggle {
  display: none;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 255, 0.7);
  background: rgba(255, 255, 255, 0.95);
  color: #111827;
  cursor: pointer;
}

.km-header__menu-toggle:focus-visible {
  outline: 2px solid #4f46e5;
  outline-offset: 2px;
}

.km-header__menu-label {
  font-family: "Nunito", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
}

.km-header__menu-icon {
  position: relative;
  width: 18px;
  height: 14px;
}

.km-header__menu-icon::before,
.km-header__menu-icon::after,
.km-header__menu-icon span {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 999px;
  background-color: #4b5563;
  transition: transform 0.2s ease, opacity 0.2s ease, top 0.2s ease, bottom 0.2s ease;
}

.km-header__menu-icon::before {
  top: 0;
}

.km-header__menu-icon::after {
  bottom: 0;
}

.km-header__menu-icon span {
  top: 6px;
}

/* When JS adds helper span */
.km-header__menu-icon span {
  display: block;
}

.km-header__menu-toggle[aria-expanded="true"] .km-header__menu-icon::before {
  top: 6px;
  transform: rotate(45deg);
}

.km-header__menu-toggle[aria-expanded="true"] .km-header__menu-icon::after {
  bottom: 6px;
  transform: rotate(-45deg);
}

.km-header__menu-toggle[aria-expanded="true"] .km-header__menu-icon span {
  opacity: 0;
}

/* Responsive layout */
@media (max-width: 768px) {
  .km-header__inner {
    padding: 0.6rem 1rem;
  }

  button.km-header__menu-toggle {
    display: inline-flex;
  }

  .km-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: rgba(250, 251, 255, 0.98);
    border-bottom: 1px solid rgba(176, 190, 222, 0.4);
    box-shadow: 0 18px 30px rgba(15, 23, 42, 0.15);
    flex-direction: column;
    align-items: stretch;
    padding: 0.35rem 1rem 0.75rem;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-4px);
    transition: max-height 0.2s ease, opacity 0.18s ease, transform 0.18s ease;
  }

  .km-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
  }

  .km-header__nav-link {
    padding-block: 0.45rem;
    width: 100%;
  }

  .km-header__cta-group {
    margin-top: 0.35rem;
    justify-content: flex-start;
  }

  .km-header__nav--open {
    max-height: 420px;
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .km-header,
  .km-header__nav {
    scroll-behavior: auto;
    transition: none !important;
  }
}