/**
 * Header component
 * Uses design tokens; semantic markup for a11y.
 */

.header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding-block: var(--space-header-block);
  background-color: var(--color-bg-container);
  box-sizing: border-box;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* Logo – home link */
.header__logo {
  display: inline-flex;
  align-items: center;
  color: var(--color-logo);
  text-decoration: none;
  line-height: 0;
}

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

.header__logo:focus {
  outline: 2px solid var(--color-header-link-focus-ring);
  outline-offset: 4px;
}

.header__logo:focus:not(:focus-visible) {
  outline: none;
}

.header__logo:focus-visible {
  outline: 2px solid var(--color-header-link-focus-ring);
  outline-offset: 4px;
}

.header__logo svg {
  width: 50px;
  height: 59px;
  flex-shrink: 0;
}

/* Nav */
.header__nav {
  display: flex;
  align-items: center;
}

.header__nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--header-nav-gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

.header__nav-link {
  color: var(--color-header-link);
  text-decoration: none;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-nav);
  font-weight: var(--font-weight-nav);
  line-height: var(--line-height-nav);
  opacity: 0.5;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.header__nav-link:hover,
.header__nav-link:focus-visible,
.header__nav-link--active {
  opacity: 1;
  color: var(--color-header-link);
}

.header__nav-link:focus {
  outline: none;
}

.header__nav-link:focus-visible {
  outline: 2px solid var(--color-header-link-focus-ring);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: no-preference) {
  .header__nav-link {
    transition: color 0.2s ease;
  }
  .header__logo {
    transition: color 0.2s ease;
  }
}

/* ── Works dropdown ── */
.header__nav-item {
  position: relative;
}

.header__dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  color: var(--color-header-link);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-nav);
  font-weight: var(--font-weight-nav);
  line-height: var(--line-height-nav);
  opacity: 0.5;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.header__dropdown-toggle:hover,
.header__dropdown-toggle:focus-visible,
.header__nav-item--has-dropdown.is-active > .header__dropdown-toggle {
  opacity: 1;
  color: var(--color-header-link);
}

.header__dropdown-toggle:focus {
  outline: none;
}

.header__dropdown-toggle:focus-visible {
  outline: 2px solid var(--color-header-link-focus-ring);
  outline-offset: 4px;
}

.header__dropdown-icon {
  font-size: 1.1rem;
  transition: transform 0.2s ease;
}

.header__dropdown-toggle[aria-expanded="true"] .header__dropdown-icon {
  transform: rotate(180deg);
}

/* Desktop dropdown */
.header__dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 0;
  min-width: 220px;
  margin: 0;
  padding: 8px 0;
  list-style: none;
  background-color: var(--color-bg-container);
  border: 0.5px solid var(--card-border-color);
  border-radius: 4px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  z-index: 100;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}

.header__nav-item--has-dropdown.is-open > .header__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.header__dropdown-link {
  display: block;
  padding: 10px 20px;
  font-family: var(--font-family-primary);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-header-link);
  text-decoration: none;
  white-space: nowrap;
}

.header__dropdown-link:hover {
  color: var(--color-card-btn-bg);
}

.header__dropdown-link:focus {
  outline: none;
}

.header__dropdown-link:focus-visible {
  outline: 2px solid var(--color-header-link-focus-ring);
  outline-offset: -2px;
}

/* ── Theme toggle button ── */
.header__theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: none;
  border: 0.5px solid var(--color-header-link);
  border-radius: 50%;
  cursor: pointer;
  color: var(--color-header-link);
  opacity: 0.75;
  transition: opacity 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.header__theme-toggle:hover {
  opacity: 1;
}

.header__theme-toggle:focus {
  outline: none;
}

.header__theme-toggle:focus-visible {
  outline: 2px solid var(--color-header-link-focus-ring);
  outline-offset: 4px;
}

.header__theme-icon {
  font-size: 1.125rem;
  line-height: 1;
}

/* ── Hamburger button (hidden on desktop) ── */
.header__menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-header-link);
  z-index: 20;
}

.header__menu-toggle:focus-visible {
  outline: 2px solid var(--color-header-link-focus-ring);
  outline-offset: 4px;
}

.header__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 16px;
  pointer-events: none;
}

.header__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
}

@media (prefers-reduced-motion: no-preference) {
  .header__hamburger span {
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
}

/* Hamburger → ✕ when open */
.header__menu-toggle[aria-expanded="true"] .header__hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.header__menu-toggle[aria-expanded="true"] .header__hamburger span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.header__menu-toggle[aria-expanded="true"] .header__hamburger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Flyout panel ── */
/* Desktop: render as normal inline nav */
.header__flyout {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* ── Mobile breakpoint ── */
@media (max-width: 768px) {
  .header__menu-toggle {
    display: flex;
  }

  /* Mobile: flyout becomes a fixed slide-in panel */
  .header__flyout {
    position: fixed;
    inset-block-start: 0;
    inset-inline-end: 0;
    width: min(320px, 80vw);
    height: 100dvh;
    background-color: var(--color-bg-container);
    padding: var(--container-margin) 40px;
    box-sizing: border-box;
    transform: translateX(100%);
    visibility: hidden;
    z-index: 15;
    border-left: 1px solid rgba(255, 255, 255, 0.08);
    justify-content: flex-start;
    padding-block-start: calc(var(--header-height) + 80px);
  }

  @media (prefers-reduced-motion: no-preference) {
    .header__flyout {
      transition: transform 0.35s ease, visibility 0.35s ease;
    }
  }

  .header__flyout[aria-hidden="false"] {
    transform: translateX(0);
    visibility: visible;
  }

  .header__flyout .header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 32px;
  }

  .header__flyout .header__nav-link {
    font-size: 1.5rem;
  }

  /* Dropdown inline in mobile flyout */
  .header__flyout .header__dropdown-toggle {
    font-size: 1.5rem;
  }

  .header__flyout .header__dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    background: none;
    border: none;
    border-left: 0.5px solid var(--card-border-color);
    border-radius: 0;
    padding: 0 0 0 16px;
    margin-top: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
  }

  .header__flyout .header__nav-item--has-dropdown.is-open > .header__dropdown {
    max-height: 200px;
    padding: 12px 0 0 16px;
  }

  .header__flyout .header__dropdown-link {
    font-size: 1.25rem;
    padding: 10px 0;
    white-space: normal;
  }

  .header__logo svg {
    width: 38px;
    height: 45px;
  }
}