/* 頁首與導覽列元件 */
.site-header {
    position: relative;
    top: auto;
    z-index: 100;
    background: transparent;
    color: var(--color-text);
    box-shadow: none;
    border-bottom: 0;
}

.site-header__brand {
    height: var(--site-header-brand-height);
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
}

.site-header__brand-inner {
    height: var(--site-header-brand-height);
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 2fr) minmax(0, 1fr);
    align-items: center;
    gap: var(--space-md);
}

.site-header__brand-logo {
    display: inline-flex;
    flex-shrink: 0;
    align-items: center;
    max-width: 100%;
    justify-self: start;
}

.site-header__brand-logo-img {
    display: block;
    height: 4.375rem;
    width: auto;
    max-width: 100%;
    object-fit: contain;
}

.site-header__brand-tagline {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    align-self: center;
    justify-self: center;
    width: 100%;
    max-width: 22rem;
    margin: 0;
    padding: 0.65rem 1.25rem;
    box-sizing: border-box;
    text-align: center;
    background-image: var(--brand-tagline-bg);
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

.site-header__brand-tagline-text {
    display: block;
    font-family: var(--font-logo);
    font-size: var(--fs-md);
    font-weight: 600;
    color: var(--color-brand-tagline-text);
    line-height: 1.5;
    letter-spacing: 0.06em;
    text-align: center;
    -webkit-text-stroke: 4px var(--color-white);
    paint-order: stroke fill;
}

.site-header__brand-contact {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    min-width: 0;
    justify-self: end;
    text-decoration: none;
}

.site-header__brand-contact-img {
    display: block;
    height: 5rem;
    width: auto;
    max-width: 100%;
    object-fit: contain;
    margin-right: 10px;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.14));
}

.site-header__brand ~ .site-header__inner .site-header__bar-logo {
    display: none;
}

.site-header__inner {
    width: 100%;
    background-color: var(--color-header-nav-bg);
    background-image: var(--header-nav-bg-gradient);
}

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

/* Logo */
.site-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 900;
    flex-shrink: 0;
    font-size: var(--fs-md);
    line-height: 1.2;
    padding: 0;
}

.site-logo__mark {
    height: 1.2em;
    width: auto;
    object-fit: contain;
}

.site-logo__text {
    font-family: var(--font-logo);
    font-size: 1.3em;
    font-weight: 900;
    color: var(--color-header-text);
    letter-spacing: 0.06em;
    line-height: 1.2;
}

.site-header .site-logo {
    background: var(--color-white);
    padding: 0 10px 0 5px;
}

.site-header .site-logo__text {
    display: inline;
    color: var(--color-header-text);
}

.site-header .site-logo__mark {
    display: block;
    height: 3.1rem;
    width: auto;
    aspect-ratio: 61 / 40;
    object-fit: contain;
}

.site-logo__text--light {
    color: var(--color-white);
}

/* 桌面導覽 */
.site-nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.site-nav__link,
.site-nav__link--parent,
.site-nav__submenu-link {
    font-weight: 100;
}

.site-nav__link {
    font-size: var(--fs-md);
    color: var(--color-text);
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-md);
    background: transparent;
}

.site-nav__link--parent {
    cursor: pointer;
}

.site-nav__link:hover,
.site-nav__link--parent:hover {
    background: transparent;
    color: var(--color-nav-link-hover);
    font-weight: 100;
}

.site-nav__link.is-active,
.site-nav__link--parent.is-active {
    background: transparent;
    color: var(--color-text);
    font-weight: 100;
}

.site-nav__submenu-link:hover {
    background: var(--color-nav-submenu-link-hover-bg);
    color: var(--color-nav-submenu-link-hover);
}

/* 漢堡按鈕（桌面隱藏） */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: calc(2.75rem * 0.7);
    height: calc(2.75rem * 0.7);
    margin-right: 0.625rem;
    background: transparent;
    border: none;
    cursor: pointer;
}

.nav-toggle__bar {
    display: block;
    width: calc(1.6rem * 1.35);
    height: 4px;
    background: var(--color-nav-toggle);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(1) {
    transform: translateY(10px) rotate(45deg);
}
.nav-toggle.is-open .nav-toggle__bar:nth-child(2) {
    opacity: 0;
}
.nav-toggle.is-open .nav-toggle__bar:nth-child(3) {
    transform: translateY(-10px) rotate(-45deg);
}

/* 手機側拉選單 */
.mobile-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 78%;
    max-width: 320px;
    height: 100vh;
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    padding: var(--space-xl) var(--space-md) var(--space-md);
    transform: translateX(100%);
    transition: transform var(--transition);
    z-index: 99;
    overflow-y: auto;
}

.mobile-nav.is-open {
    transform: translateX(0);
}

.mobile-nav__close {
    position: absolute;
    top: 0;
    right: var(--space-md);
    margin-top: var(--space-xl);
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
}

.mobile-nav__close-icon {
    width: 1.5rem;
    height: 1.5rem;
    filter: grayscale(1) brightness(0.7);
    opacity: 0.6;
}

.mobile-nav__list {
    text-align: left;
}

.mobile-nav__list li {
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav__link,
.mobile-nav__toggle,
.mobile-nav__sublink {
    font-weight: 100;
}

.mobile-nav__link {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-sm);
    padding: var(--space-md) 0;
    font-size: var(--fs-md);
    color: var(--color-text);
    text-align: left;
}

.mobile-nav__toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) 0;
    border: 0;
    background: transparent;
    cursor: pointer;
    text-align: left;
    font: inherit;
    color: var(--color-text);
}

.mobile-nav__link-inner {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-sm);
    flex: 1;
    min-width: 0;
    text-align: left;
}

.mobile-nav__icon {
    display: block;
    width: 1.625rem;
    height: 1.625rem;
    flex-shrink: 0;
    background-color: var(--color-mobile-nav-icon);
    -webkit-mask-image: var(--mobile-nav-icon-mask);
    mask-image: var(--mobile-nav-icon-mask);
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-position: center;
    mask-position: center;
}

.mobile-nav__label {
    flex: 1;
    min-width: 0;
    text-align: left;
}

.mobile-nav__caret {
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 0.3rem solid transparent;
    border-right: 0.3rem solid transparent;
    border-top: 0.35rem solid currentColor;
    transition: transform var(--transition);
    flex-shrink: 0;
}

.mobile-nav__item--has-submenu.is-open .mobile-nav__caret {
    transform: rotate(180deg);
}

.mobile-nav__submenu {
    display: none;
    margin: 0;
    padding: 0 0 var(--space-sm) calc(1.625rem + var(--space-sm));
    list-style: none;
    text-align: left;
}

.mobile-nav__item--has-submenu.is-open .mobile-nav__submenu {
    display: block;
}

.mobile-nav__list .mobile-nav__submenu li:last-child {
    border-bottom: none;
}

.mobile-nav__item--has-submenu.is-open {
    border-bottom: none;
}

.mobile-nav__link.is-active,
.mobile-nav__toggle.is-active {
    color: var(--color-mobile-nav-active);
    font-weight: 100;
}

.mobile-nav a:hover,
.mobile-nav__sublink:hover {
    color: var(--color-mobile-nav-active);
}

.mobile-nav__sublink {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-sm);
    padding: 0.5rem 0;
    font-size: var(--fs-base);
    color: var(--color-text-soft);
    text-align: left;
    text-decoration: none;
}

.mobile-nav__sublink .mobile-nav__label {
    flex: 1;
    text-align: left;
}

.mobile-nav__sublink-arrow {
    width: 0.875rem;
    height: 0.875rem;
    flex-shrink: 0;
    margin-left: auto;
    opacity: 0.55;
}

.mobile-nav__overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition);
    z-index: 98;
}

.mobile-nav__overlay.is-open {
    opacity: 1;
    visibility: visible;
}

/* 響應式：平板以下收合桌面選單、隱藏 brand 區、顯示漢堡與左側 logo-xs */
@media (max-width: 1024px) {
    .site-header {
        box-shadow: none;
    }

    .site-header__brand {
        display: none;
    }

    .site-header__inner {
        position: fixed;
        top: var(--site-topbar-height);
        left: 0;
        right: 0;
        z-index: 199;
        background-color: var(--color-white);
        background-image: none;
    }

    .site-header__inner-bar {
        background-color: var(--color-white);
        background-image: none;
        box-shadow: var(--shadow-header-inner-bar);
    }

    .site-nav,
    .site-header__cta {
        display: none;
    }
    .nav-toggle {
        display: flex;
    }

    .site-header__inner,
    .site-header__inner-bar {
        height: var(--header-height);
        min-height: var(--header-height);
    }

    .site-header__brand ~ .site-header__inner .site-header__bar-logo {
        display: inline-flex;
        align-items: center;
        flex-shrink: 0;
        height: 100%;
        padding: 0 0 0 var(--space-sm);
        background: transparent;
        text-decoration: none;
    }

    .site-header__bar-logo-img {
        display: block;
        height: calc(100% - 12px);
        margin-top: 6px;
        margin-bottom: 6px;
        width: auto;
        object-fit: contain;
    }

    /* 固定選單脫離文檔流，主內容需留出選單列高度避免重疊 */
    .site-main {
        padding-top: var(--header-height);
    }
}

@media (max-width: 767px) {
    .site-header__brand-logo {
        max-width: 45%;
    }

    .site-header__brand-logo-img {
        height: 3rem;
    }

    .site-header__brand-contact-img {
        height: 3.5rem;
    }
}

@media (min-width: 1025px) {
    .site-header__brand ~ .site-header__inner .site-header__bar-logo {
        display: none;
    }
}

/* 內頁頂部橫幅（banner 背景 + logo，位於 topnav 上方） */
.site-page-banner {
    height: 180px;
    width: 100%;
    background: url("../img/banner.jpg") center / cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
}

.site-page-banner__inner {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    height: 100%;
    max-width: min(100%, 56rem);
    padding: 0 var(--space-md);
}

.site-page-banner__logo {
    display: block;
    height: 80%;
    width: auto;
    max-width: min(90%, 20rem);
    flex-shrink: 0;
    object-fit: contain;
}

.site-page-banner__tagline {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    margin: 0;
    font-size: var(--fs-xl);
    color: var(--color-banner-tagline);
    letter-spacing: 0.04em;
    line-height: 1.35;
    text-align: center;
    align-items: center;
    -webkit-text-stroke: 4px var(--color-white);
    paint-order: stroke fill;
}

.site-page-banner__tagline-line {
    display: block;
}

.site-page-banner__tagline-line:first-child {
    font-weight: 700;
}

@media (max-width: 1024px) {
    .site-page-banner {
        display: none;
    }
}