@charset "UTF-8";
/**
 * Header
 */

/* ========================================
   HEADER BASE
======================================== */

.kv-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  max-width: 100%;
  z-index: var(--z-index-fixed);
  transition: all 0.3s cubic-bezier(0.3, 0.26, 0.38, 1);
  overflow-x: hidden;
}

.kv-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem var(--container-padding-mobile);
  transition: padding 0.3s ease;
}

@media (min-width: 768px) {
  .kv-header__inner {
    padding: 1.5rem var(--container-padding-tablet);
  }
}

@media (min-width: 1441px) {
  .kv-header__inner {
    padding-left: max(64px, 4rem);
    padding-right: max(64px, 4rem);
  }
}

/* Header Background */
.kv-header__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0);
  backdrop-filter: blur(0px);
  transition: all 0.3s ease;
  z-index: -1;
}

/* Scrolled State - 背景なしで文字色のみ変更 */
.kv-header.is-scrolled .kv-header__bg {
  background: transparent;  /* 背景は透明 */
  backdrop-filter: none;
  box-shadow: none;  /* 影もなし */
}

.kv-header.is-scrolled .kv-header__inner {
  padding-top: 1rem;
  padding-bottom: 1rem;
}

/* Color Mode - White（初期状態：MV上では白文字） */
.kv-header .kv-header__logo-text,
.kv-header .kv-header__nav-main a,
.kv-header .kv-header__menu-text {
  color: var(--color-text-white);
  transition: color 0.3s ease;
}

/* Color Mode - Black（MVを抜けたら黒文字） */
.kv-header.is-scrolled .kv-header__logo-text,
.kv-header.is-scrolled .kv-header__nav-main a,
.kv-header.is-scrolled .kv-header__menu-text {
  color: var(--color-text-primary);
}

/* ========================================
   LOGO
======================================== */

.kv-header__logo {
  text-decoration: none;
  transition: opacity 0.3s ease;
  pointer-events: auto;
}

.kv-header__logo:hover {
  opacity: 0.7;
}

.kv-header__logo-text {
  font-size: 1rem;
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
  transition: color 0.3s ease;
}

/* ========================================
   DESKTOP NAVIGATION
======================================== */

.kv-header__nav-wrap {
  display: none;  /* PC・モバイル共にハンバーガーメニューのみ */
}

.kv-header__nav-main {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.kv-header__nav-main li {
  position: relative;
}

.kv-header__nav-main a {
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: opacity 0.25s cubic-bezier(0.3, 0.26, 0.38, 1);
  display: block;
}

@media (hover: hover) and (pointer: fine) {
  .kv-header__nav-main a:hover {
    opacity: 0.5;
  }
}

/* Separator */
.kv-header__nav-separator {
  width: 1px;
  height: 1rem;
  background: currentColor;
  opacity: 0.2;
}

/* ========================================
   MENU BUTTON (PC & MOBILE)
======================================== */

.kv-header__menu-trigger {
  display: block;
  margin-left: auto;
  pointer-events: auto;
  /* PC・モバイル共に常に表示 */
}

.kv-header__menu-btn {
  background: none;
  border: none;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-family: var(--font-family-en-accent);
  transition: opacity 0.3s ease;
}

.kv-header__menu-btn:hover {
  opacity: 0.7;
}

.kv-header__menu-text {
  font-size: 0.875rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.1em;
  transition: color 0.3s ease;
}

/* ========================================
   MOBILE MENU MODAL
======================================== */

.kv-header-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-index-modal);
  visibility: hidden;
  opacity: 0;
  transition: visibility 0s 0.5s, opacity 0.5s ease;
}

.kv-header-modal[aria-hidden="false"],
.kv-header-modal.is-active {
  visibility: visible;
  opacity: 1;
  transition: visibility 0s, opacity 0.5s ease;
}

.kv-header-modal__inner {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 2rem 4rem;
}

/* Modal Background */
.kv-header-modal__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-bg-dark);
  z-index: -1;
}

/* Navigation */
.kv-header-modal__nav {
  width: 100%;
  max-width: 600px;
}

/* Main Navigation */
.kv-header-modal__nav-main {
  list-style: none;
  margin: 0 0 3rem 0;
  padding: 0;
}

.kv-header-modal__nav-main li {
  margin-bottom: 1.5rem;
}

.kv-header-modal__nav-main a {
  font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-white);
  text-decoration: none;
  transition: opacity 0.25s ease;
  display: block;
}

.kv-header-modal__nav-main a:hover {
  opacity: 0.5;
}

/* Sub Navigation */
.kv-header-modal__nav-sub {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: 2rem;
}

.kv-header-modal__nav-sub-list {
  list-style: none;
  margin: 0 0 2rem 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
}

.kv-header-modal__nav-sub-list a {
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.25s ease;
}

.kv-header-modal__nav-sub-list a:hover {
  color: var(--color-text-white);
}

/* SNS Links */
.kv-header-modal__sns {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
}

.kv-header-modal__sns a {
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  transition: color 0.25s ease;
  letter-spacing: 0.05em;
}

.kv-header-modal__sns a:hover {
  color: var(--color-text-white);
}

/* Close Button */
.kv-header-modal__close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: none;
  border: none;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-family: var(--font-family-en-accent);
  z-index: 10;
}

@media (min-width: 768px) {
  .kv-header-modal__close {
    top: 2rem;
    right: 4rem;
  }
}

.kv-header-modal__close-text {
  font-size: 0.875rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-white);
  letter-spacing: 0.1em;
  transition: opacity 0.3s ease;
}

.kv-header-modal__close:hover .kv-header-modal__close-text {
  opacity: 0.5;
}

/* ========================================
   JAVASCRIPT TRIGGERS
======================================== */

/* These classes will be toggled by JavaScript */
body.menu-open {
  overflow: hidden;
}

/* Disable animations if user prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
  }
}