/* ============================================================
   Daily Calculator — header.css
   Site header, brand, navigation, mobile drawer
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-xs);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: var(--header-height);
}

/* ---------- Brand ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  font-weight: var(--fw-bold);
  font-size: var(--fs-md);
  letter-spacing: -0.01em;
  flex-shrink: 0;
  min-height: 44px;
}

.brand:hover { text-decoration: none; }

.brand__mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  object-fit: cover;
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .brand__mark { width: 36px; height: 36px; }
}

.brand__name {
  color: var(--color-primary-dark);
  font-weight: var(--fw-bold);
  white-space: nowrap;
}

.brand__name strong { color: var(--color-primary); }

/* ---------- Desktop navigation ---------- */
.nav-primary {
  display: none;
}

@media (min-width: 1024px) {
  .nav-primary {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin-left: var(--space-4);
    flex: 1 1 auto;
  }
}

.nav-primary__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-primary__item { position: relative; }

.nav-primary__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-primary__link:hover,
.nav-primary__link[aria-expanded="true"] {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  text-decoration: none;
}

.nav-primary__link[aria-current="page"] {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.nav-primary__link svg {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-fast);
}

.nav-primary__link[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

/* ---------- Dropdown ---------- */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 260px;
  max-width: 340px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--transition-fast),
              transform var(--transition-fast),
              visibility var(--transition-fast);
  z-index: var(--z-dropdown);
}

.nav-dropdown[data-open="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.nav-dropdown__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  color: var(--color-text);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-dropdown__link:hover,
.nav-dropdown__link:focus-visible {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  text-decoration: none;
}

/* ---------- Header actions ---------- */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.header-search-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-bg-subtle);
  color: var(--color-text);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  border: 1px solid var(--color-border);
  min-height: 40px;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.header-search-btn:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

.header-search-btn svg {
  width: 16px;
  height: 16px;
}

.header-search-btn__label { display: none; }

@media (min-width: 640px) {
  .header-search-btn__label { display: inline; }
}

/* ---------- Mobile menu toggle ---------- */
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  transition: background-color var(--transition-fast);
}

.menu-toggle:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

@media (min-width: 1024px) {
  .menu-toggle { display: none; }
}

.menu-toggle__icon {
  width: 22px;
  height: 22px;
}

.menu-toggle__icon--close { display: none; }
.menu-toggle[aria-expanded="true"] .menu-toggle__icon--open  { display: none; }
.menu-toggle[aria-expanded="true"] .menu-toggle__icon--close { display: block; }

/* ---------- Mobile drawer ---------- */
.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-drawer);
  visibility: hidden;
  pointer-events: none;
}

.mobile-drawer[data-open="true"] {
  visibility: visible;
  pointer-events: auto;
}

.mobile-drawer__overlay {
  position: absolute;
  inset: 0;
  background: rgba(23, 32, 51, 0.5);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.mobile-drawer[data-open="true"] .mobile-drawer__overlay {
  opacity: 1;
}

.mobile-drawer__panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(88vw, 380px);
  height: 100%;
  background: var(--color-white);
  box-shadow: var(--shadow-xl);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.mobile-drawer[data-open="true"] .mobile-drawer__panel {
  transform: translateX(0);
}

.mobile-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  min-height: var(--header-height);
}

.mobile-drawer__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text);
}

.mobile-drawer__close:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.mobile-drawer__body {
  flex: 1 1 auto;
  padding: var(--space-4);
}

.mobile-nav__section {
  margin-bottom: var(--space-6);
}

.mobile-nav__title {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  padding-inline: var(--space-2);
}

.mobile-nav__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 2px;
}

.mobile-nav__link {
  display: block;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
  color: var(--color-text);
  text-decoration: none;
  min-height: 44px;
  transition: background-color var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link:focus-visible {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  text-decoration: none;
}

.mobile-nav__link[aria-current="page"] {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-weight: var(--fw-semibold);
}

body.drawer-open { overflow: hidden; }