/* ========================================
   HEADER CSS
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: var(--z-header);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
}

.header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0);
    backdrop-filter: blur(0px);
    transition: all var(--transition-base);
}

.header.is-scrolled::before {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

.header__inner {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--padding-x);
}

/* Logo */
.header__logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

/* 実物ロゴ（左上） */
.header__logo-img {
    display: block;
    height: 36px;
    width: auto;
    transition: filter var(--transition-base);
}

/* ナビが詰まる幅では少し小さくする */
@media (max-width: 1320px) {
    .header__logo-img { height: 32px; }
}

@media (max-width: 768px) {
    .header__logo-img { height: 30px; }
}

/* ヒーロー写真の上（未スクロール時）は黒文字が沈むので白版にする
   ── 公式サイトのフッターでも白一色のロゴが使われている運用に合わせる */
.header:not(.is-scrolled) .header__logo-img {
    filter: brightness(0) invert(1);
}

.header__logo-text {
    font-family: var(--font-heading-en);
    font-size: 1.5rem;
    font-weight: var(--fw-black);
    color: var(--color-navy);
    letter-spacing: 0.08em;
}

.header__logo-text span {
    color: var(--color-primary);
}

.header:not(.is-scrolled) .header__logo-text,
.header:not(.is-scrolled) .header__nav-link {
    color: var(--text-white);
}

.header:not(.is-scrolled) .header__logo-text span {
    color: var(--color-primary-light);
}

.header:not(.is-scrolled) .header__hamburger-line {
    background: var(--text-white);
}

/* Desktop Navigation */
.header__nav {
    display: flex;
    align-items: center;
    gap: 0;
}

.header__nav-list {
    display: flex;
    align-items: center;
    gap: 0.2rem;
}

.header__nav-item {
    position: relative;
}

.header__nav-link {
    display: block;
    padding: 0.5rem 1rem;
    font-family: var(--font-heading-jp);
    font-size: 0.85rem;
    font-weight: var(--fw-medium);
    color: var(--color-navy);
    letter-spacing: 0.06em;
    transition: color var(--transition-fast);
    position: relative;
}

.header__nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
    transition: width var(--transition-base);
}

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

.header__nav-link:hover::after {
    width: 60%;
}

/* CTA Button in Header */
.header__cta {
    margin-left: 1rem;
}

.header__cta .btn {
    padding: 0.6rem 1.6rem;
    font-size: 0.82rem;
}

/* Hamburger Menu Button */
.header__hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    gap: 6px;
    cursor: pointer;
    z-index: var(--z-modal);
}

.header__hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-navy);
    border-radius: 1px;
    transition: all var(--transition-base);
    transform-origin: center;
}

.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);
}

/* Mobile Menu Overlay */
.header__mobile-menu {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px);
    z-index: var(--z-overlay);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.header__mobile-menu.is-active {
    display: flex;
    opacity: 1;
}

.header__mobile-menu .header__nav-link {
    font-size: 1.2rem;
    padding: 0.8rem 1rem;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .header__nav {
        display: none;
    }

    .header__cta {
        display: none;
    }

    .header__hamburger {
        display: flex;
    }
}