/* ==========================================================================
   Header
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: transparent;
  transition:
    background-color var(--transition-speed) var(--easing),
    box-shadow var(--transition-speed) var(--easing);
}

.header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: 80px;
}

.header-logo {
  display: flex;
  align-items: center;
}

.header-logo-img {
  height: 40px;
  width: auto;
}

.header-nav-list {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.header-nav-link {
  font-family: var(--font-en);
  font-size: var(--fz-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-md);
  color: var(--color-white);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-speed) var(--easing);
}

.header.is-scrolled .header-nav-link {
  color: var(--color-black);
}

.header-nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-primary);
  transition: width var(--transition-speed) var(--easing);
}

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

.header-nav-link:hover::after {
  width: 100%;
}

.header-nav-link--contact {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 28px;
  background: var(--gradient-primary);
  color: var(--color-white);
  border-radius: var(--radius-full);
  transition: opacity var(--transition-speed) var(--easing);
}

.header-nav-link--contact::after {
  display: none;
}

.header-nav-link--contact:hover {
  opacity: 0.85;
  color: var(--color-white);
}

/* スクロール前後どちらも白文字を維持 */
.header.is-scrolled .header-nav-link--contact {
  color: var(--color-white);
}

/* Hamburger */
.header-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.header-hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition:
    transform var(--transition-speed) var(--easing),
    opacity var(--transition-speed) var(--easing),
    background-color var(--transition-speed) var(--easing);
}

.header.is-scrolled .header-hamburger-line {
  background-color: var(--color-black);
}

.header-hamburger.is-active .header-hamburger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.header-hamburger.is-active .header-hamburger-line:nth-child(2) {
  opacity: 0;
}

.header-hamburger.is-active .header-hamburger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  background-color: var(--color-bg-alt);
  color: var(--color-black);
  padding: var(--space-2xl) 0 var(--space-md);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-gray-border);
}

.footer-logo {
  display: inline-block;
  margin-bottom: var(--space-sm);
}

.footer-logo-img {
  height: 40px;
  width: auto;
}

.footer-description {
  font-family: var(--font-jp);
  font-size: var(--fz-sm);
  font-weight: var(--fw-regular);
  letter-spacing: var(--ls-md);
  color: var(--color-gray);
  margin-bottom: var(--space-md);
}

.footer-address {
  font-family: var(--font-jp);
  font-size: var(--fz-xs);
  font-style: normal;
  line-height: var(--lh-lg);
  color: var(--color-gray);
}

.footer-nav {
  display: flex;
  gap: var(--space-xl);
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-nav-link {
  font-family: var(--font-en);
  font-size: var(--fz-xs);
  font-weight: var(--fw-regular);
  letter-spacing: var(--ls-md);
  color: var(--color-gray);
  text-decoration: none;
  transition: color var(--transition-speed) var(--easing);
}

.footer-nav-link:hover {
  color: var(--color-black);
}

.footer-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
}

.footer-cta-text {
  font-family: var(--font-jp);
  font-size: var(--fz-sm);
  font-weight: var(--fw-regular);
  color: var(--color-gray);
}

.footer-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 40px;
  font-family: var(--font-en);
  font-size: var(--fz-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-lg);
  color: var(--color-white);
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: opacity var(--transition-speed) var(--easing);
}

.footer-cta-btn:hover {
  opacity: 0.85;
}

.footer-bottom {
  padding-top: var(--space-md);
  text-align: center;
}

.footer-copyright {
  font-family: var(--font-en);
  font-size: var(--fz-xs);
  font-weight: var(--fw-light);
  letter-spacing: var(--ls-sm);
  color: var(--color-gray);
}

/* ==========================================================================
   Section Title
   ========================================================================== */

.section-title {
  margin-bottom: var(--space-lg);
}

.section-title-en {
  display: inline-block;
  font-family: var(--font-en);
  font-size: clamp(40px, 4vw, 56px);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-lg);
  line-height: var(--lh-sm);
  color: var(--color-primary);
}

body:not(.is-subpage) .section-title-en {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-title-jp {
  display: block;
  font-family: var(--font-jp);
  font-size: var(--fz-md);
  font-weight: var(--fw-regular);
  letter-spacing: var(--ls-md);
  color: var(--color-gray);
  margin-top: 4px;
}

/* ==========================================================================
   Page Title
   ========================================================================== */

.page-title {
  position: relative;
  padding: var(--space-3xl) 0 var(--space-lg);
  padding-top: clamp(120px, 15vw, 180px);
  background-color: var(--color-bg-alt);
  overflow: hidden;
}

.page-title-inner {
  position: relative;
  z-index: 1;
}

.page-title-bg {
  position: absolute;
  top: 55%;
  left: max(var(--container-padding), calc((100% - var(--container-max)) / 2 + var(--container-padding)));
  transform: translateY(-50%);
  font-family: var(--font-en);
  font-size: clamp(50px, 7vw, 100px);
  font-weight: var(--fw-bold);
  letter-spacing: 0.02em;
  color: rgba(0, 0, 0, 0.06);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  z-index: 0;
  text-transform: uppercase;
}

.page-title-heading {
  font-family: var(--font-jp);
  font-size: clamp(28px, 3.5vw, 42px);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-md);
  line-height: var(--lh-sm);
  color: var(--color-black);
}

.page-title-desc {
  font-family: var(--font-jp);
  font-size: var(--fz-base);
  font-weight: var(--fw-regular);
  letter-spacing: var(--ls-md);
  line-height: var(--lh-lg);
  color: var(--color-black);
  margin-top: var(--space-md);
}

/* ==========================================================================
   Breadcrumb
   ========================================================================== */

.breadcrumb {
  padding: var(--space-sm) 0;
  margin-bottom: calc(-1 * var(--space-lg));
}

.breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 0;
  font-family: var(--font-jp);
  font-size: var(--fz-xs);
  color: var(--color-gray);
  letter-spacing: var(--ls-sm);
}

.breadcrumb a {
  color: var(--color-gray);
  text-decoration: none;
  transition: color var(--transition-speed) var(--easing);
}

.breadcrumb a:hover {
  color: var(--color-black);
  opacity: 1;
}

.breadcrumb-separator {
  margin: 0 8px;
  color: var(--color-gray);
}

.breadcrumb-current {
  color: var(--color-black);
  font-weight: var(--fw-medium);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 40px;
  font-family: var(--font-en);
  font-size: var(--fz-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-lg);
  color: var(--color-white);
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: opacity var(--transition-speed) var(--easing);
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 40px;
  font-family: var(--font-en);
  font-size: var(--fz-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-lg);
  color: var(--color-primary);
  background-color: transparent;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color var(--transition-speed) var(--easing),
    color var(--transition-speed) var(--easing);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* ==========================================================================
   Section Padding
   ========================================================================== */

.section-padding {
  padding: var(--space-2xl) 0;
}