/* ==========================================================================
   HEADER
   Desktop 1440×80  ·  Mobile 375×56
   Default (transparent) → Scrolled (white)
   ========================================================================== */

/* ------------------------------------------------------------------
   BASE
   ------------------------------------------------------------------ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-sticky);
  height: var(--header-desktop-h);
  background: transparent;
  backdrop-filter: var(--header-blur);
  -webkit-backdrop-filter: var(--header-blur);
  border-bottom: var(--header-border-bottom);
  color: var(--color-font-primary);
  transition: background var(--transition-default),
              border-color var(--transition-default),
              color var(--transition-default);
}

.site-header__inner {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-40);
}

/* ------------------------------------------------------------------
   LOGO
   ------------------------------------------------------------------ */
.site-header__logo {
  font-family: var(--font-en);
  font-weight: 400;
  font-size: var(--logo-desktop-size);
  line-height: var(--logo-desktop-lh);
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color var(--transition-default);
}

/* ------------------------------------------------------------------
   NAV + CTA WRAPPER (desktop: pushed right of logo)
   ------------------------------------------------------------------ */
.site-header__nav-cta {
  display: flex;
  align-items: center;
  gap: 228px;
  margin-left: auto;
}

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

.site-header__nav-list li {
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  position: relative;
  font-family: var(--font-body);
  font-weight: var(--nav-item-weight);
  font-size: var(--nav-item-size);
  line-height: var(--nav-item-lh);
  color: inherit;
  text-decoration: none;
  padding: var(--space-4) 0;
  transition: color var(--transition-default);
}

.site-header__nav-list a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: currentColor;
  transition: var(--transition-underline);
}

.site-header__nav-list a:hover::after,
.site-header__nav-list a:focus-visible::after,
.site-header__nav-list .current-menu-item > a::after {
  width: 100%;
}

/* ------------------------------------------------------------------
   CTA BUTTONS
   ------------------------------------------------------------------ */
.site-header__cta {
  display: flex;
  align-items: center;
  gap: var(--header-cta-gap);
  flex-shrink: 0;
}

.site-header__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--btn-secondary-lg-size);
  line-height: 1.2;
  letter-spacing: 0.0625em;
  border-radius: var(--radius-pill);
  padding: var(--space-12) var(--space-28);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: var(--transition-default);
}

.site-header__btn:focus-visible {
  outline: 2px solid var(--color-bg-01);
  outline-offset: 2px;
}

.site-header__btn:active {
  transform: scale(0.97);
}

/* Outline variant (Line預約) */
.site-header__btn--outline {
  background: transparent;
  color: var(--color-font-primary);
  border: 1px solid var(--color-font-primary);
}

.site-header__btn--outline:hover {
  background: var(--color-white-06);
}

/* Filled variant (電話預約) */
.site-header__btn--filled {
  background: var(--color-font-primary);
  color: var(--color-black-01);
  border: 1px solid transparent;
}

.site-header__btn--filled:hover {
  background-image: linear-gradient(
    to bottom,
    var(--color-state-hover-overlay),
    transparent
  );
}

/* ------------------------------------------------------------------
   HAMBURGER (hidden on desktop)
   ------------------------------------------------------------------ */
.site-header__hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
  flex-shrink: 0;
  transition: color var(--transition-default);
}

.site-header__hamburger-icon {
  width: 24px;
  height: 24px;
  display: block;
}

/* ------------------------------------------------------------------
   SCROLLED STATE
   ------------------------------------------------------------------ */
.site-header--scrolled {
  background: var(--color-surface-white);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border-bottom-color: var(--color-divider);
  color: var(--color-bg-02);
}

.site-header--scrolled .site-header__btn--outline {
  color: var(--color-black-01);
  border-color: var(--color-black-01);
}

.site-header--scrolled .site-header__btn--filled {
  background: var(--color-black-01);
  color: var(--color-font-primary);
}

.site-header--scrolled .site-header__btn--filled:hover {
  background-image: linear-gradient(
    to bottom,
    var(--color-state-hover-overlay),
    transparent
  );
}

/* ------------------------------------------------------------------
   MOBILE  (max-width: 767px)
   ------------------------------------------------------------------ */
@media (max-width: 767px) {
  .site-header {
    height: var(--header-mobile-h);
  }

  .site-header__inner {
    padding: 0 var(--space-12);
  }

  .site-header__hamburger {
    display: inline-flex;
    margin-right: var(--space-16);
  }

  .site-header__logo {
    font-size: var(--logo-mobile-size);
    line-height: var(--logo-mobile-lh);
  }

  .site-header__nav-cta {
    gap: 0;
    margin-left: auto;
  }

  .site-header__nav {
    display: none;
  }

  .site-header__cta {
    gap: var(--space-8);
  }

  .site-header__btn {
    font-size: var(--btn-secondary-sm-size);
    padding: var(--btn-mobile-cta-py) var(--btn-mobile-cta-px);
  }

  .site-header__btn--outline {
    width: 78px;
  }

  .site-header__btn--filled {
    width: 76px;
  }
}

/* ------------------------------------------------------------------
   MOBILE MENU DRAWER
   ------------------------------------------------------------------ */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  pointer-events: none;
  visibility: hidden;
}

.mobile-menu[aria-hidden="false"] {
  pointer-events: auto;
  visibility: visible;
}

.mobile-menu__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity 300ms ease;
}

.mobile-menu[aria-hidden="false"] .mobile-menu__overlay {
  opacity: 1;
}

.mobile-menu__panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 280px;
  height: 100%;
  background: var(--color-surface-white);
  color: var(--color-bg-02);
  transform: translateX(-100%);
  transition: transform 300ms ease;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-menu[aria-hidden="false"] .mobile-menu__panel {
  transform: translateX(0);
}

.mobile-menu__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-16) var(--space-20);
  border-bottom: var(--footer-divider);
  flex-shrink: 0;
}

.mobile-menu__logo {
  font-family: var(--font-en);
  font-weight: 400;
  font-size: var(--logo-mobile-size);
  line-height: var(--logo-mobile-lh);
  color: inherit;
  text-decoration: none;
}

.mobile-menu__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
}

.mobile-menu__close:focus-visible {
  outline: 2px solid var(--color-bg-01);
  outline-offset: 2px;
}

.mobile-menu__nav {
  padding: var(--space-24) var(--space-20);
}

.mobile-menu__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mobile-menu__list li {
  margin: 0;
  padding: 0;
}

.mobile-menu__list a {
  display: block;
  font-family: var(--font-body);
  font-weight: var(--nav-item-weight);
  font-size: var(--nav-item-size);
  line-height: var(--nav-item-lh);
  color: inherit;
  text-decoration: none;
  padding: var(--space-16) 0;
  border-bottom: 1px solid var(--color-gray-01);
  transition: color var(--transition-default);
}

.mobile-menu__list li:last-child a {
  border-bottom: none;
}

.mobile-menu__list a:hover {
  color: var(--color-font-accent);
}

body.mobile-menu-open {
  overflow: hidden;
}