/**
 * Header Component
 * BEM naming convention: site-header__*
 */

.site-header {
    background: var(--travel-card-bg);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 0 rgba(0,0,0,0.05);
    padding: var(--travel-space-sm) 0;
    transition: var(--travel-transition);
}

.site-header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--travel-space-lg);
}

/* Branding / Logo */
.site-header__branding {
    flex-shrink: 0;
}

.site-header__logo {
    display: flex;
    align-items: center;
    font-size: var(--travel-fs-h3);
    font-weight: 800;
    color: var(--travel-primary);
    text-decoration: none;
}

.site-header__logo-text {
    background: linear-gradient(135deg, var(--travel-primary) 0%, var(--travel-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

/* Navigation */
.site-header__nav {
    flex-grow: 1;
    display: flex;
    justify-content: center;
}

.main-navigation__list {
    display: flex;
    list-style: none;
    gap: var(--travel-space-md);
    margin: 0;
    padding: 0;
    align-items: center;
}

/* selector 同時兼顧 wp_nav_menu 輸出的 .menu-item 與 fallback 的 .main-navigation__item */
.main-navigation__list > li > a {
    display: inline-block;
    font-weight: 600;
    color: var(--travel-text-main);
    font-size: var(--travel-fs-h5);
    padding: var(--travel-space-xs) var(--travel-space-md);
    border-radius: var(--travel-radius-pill);
    transition: color 0.18s ease, background-color 0.18s ease;
    text-decoration: none;
}

/* hover：色變 accent + 淡橘底色 pill */
.main-navigation__list > li > a:hover {
    color: var(--travel-accent);
    background: rgba(230, 126, 34, 0.12);
}

/* 鍵盤 focus：明顯外框 */
.main-navigation__list > li > a:focus-visible {
    color: var(--travel-accent);
    background: rgba(230, 126, 34, 0.12);
    outline: 2px solid var(--travel-accent);
    outline-offset: 3px;
}

/* 點擊瞬間：底色加深 */
.main-navigation__list > li > a:active {
    background: rgba(230, 126, 34, 0.20);
}

/* 目前頁 — 同時兼容 wp_nav_menu 與手刻 fallback list；文字 accent + 加粗 + 淡底 */
.main-navigation__list > li.current-menu-item > a,
.main-navigation__list > li.current_page_item > a,
.main-navigation__list > li.current-menu-ancestor > a,
.main-navigation__list > li > a[aria-current="page"],
.main-navigation__list > li.is-active > a {
    color: var(--travel-accent);
    font-weight: 700;
    background: rgba(230, 126, 34, 0.14);
}

@media (prefers-reduced-motion: reduce) {
    .main-navigation__list > li > a {
        transition: none;
    }
}

/* Actions */
.site-header__actions {
    display: flex;
    align-items: center;
    gap: var(--travel-space-md);
    flex-shrink: 0;
}

.site-header__icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--travel-radius-pill);
    color: var(--travel-text-muted);
    background: transparent;
    border: none;
    cursor: pointer;
    position: relative;
    transition: var(--travel-transition);
}

.site-header__icon-btn:hover {
    background: var(--travel-bg);
    color: var(--travel-accent);
}

.site-header__icon-btn .dashicons {
    font-size: 20px;
}

/* Search Trigger */
.search-trigger {
    display: flex;
    align-items: center;
}

/* Mobile Toggle (漢堡按鈕) */
.site-header__mobile-toggle {
    display: none; /* 桌面版隱藏，手機版打開 */
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--travel-radius-btn);
    cursor: pointer;
    transition: background-color 0.2s;
    /* 蓋掉 base.css 給所有 <button> 的 inline-flex 等預設 */
    white-space: normal;
    color: var(--travel-text-main);
}
.site-header__mobile-toggle:hover {
    background: var(--travel-bg);
}
.site-header__mobile-toggle:focus-visible {
    outline: 2px solid var(--travel-accent);
    outline-offset: 2px;
}

.site-header__mobile-toggle-bar {
    display: block;
    width: 22px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: transform 0.25s ease, opacity 0.2s ease;
    transform-origin: center;
}

/* 開啟時轉成 X */
.site-header__mobile-toggle[aria-expanded="true"] .site-header__mobile-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.site-header__mobile-toggle[aria-expanded="true"] .site-header__mobile-toggle-bar:nth-child(2) {
    opacity: 0;
}
.site-header__mobile-toggle[aria-expanded="true"] .site-header__mobile-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* a11y — 視覺隱藏但 screen reader 可讀 */
.screen-reader-text {
    position: absolute !important;
    clip: rect(1px, 1px, 1px, 1px);
    width: 1px;
    height: 1px;
    overflow: hidden;
    word-wrap: normal !important;
}

/* Responsive */
@media (max-width: 1023px) {
    .site-header__nav {
        /* 預設收起；點漢堡 .site-header.is-open 時下拉。 */
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--travel-card-bg);
        box-shadow: 0 8px 24px rgba(0,0,0,0.08);
        border-top: 1px solid rgba(0,0,0,0.05);
        padding: var(--travel-space-md) 0;
        max-height: calc(100vh - 80px);
        overflow-y: auto;
        transform: translateY(-8px);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.2s ease, opacity 0.2s ease, visibility 0.2s ease;
        z-index: 999;
    }

    .site-header.is-open .site-header__nav {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .main-navigation__list {
        flex-direction: column;
        gap: 0;
    }

    .main-navigation__list > li > a {
        display: block;
        padding: var(--travel-space-md) var(--travel-space-lg);
        font-size: var(--travel-fs-body);
        border-radius: 0;
        border-bottom: 1px solid rgba(0,0,0,0.04);
        border-left: 3px solid transparent;
    }
    .main-navigation__list > li > a:hover,
    .main-navigation__list > li > a:focus-visible {
        background: rgba(230, 126, 34, 0.08);
        color: var(--travel-accent);
        border-left-color: var(--travel-accent);
    }
    .main-navigation__list > li.current-menu-item > a,
    .main-navigation__list > li.current_page_item > a,
    .main-navigation__list > li.current-menu-ancestor > a,
    .main-navigation__list > li > a[aria-current="page"],
    .main-navigation__list > li.is-active > a {
        background: rgba(230, 126, 34, 0.14);
        color: var(--travel-accent);
        border-left-color: var(--travel-accent);
    }

    .site-header__mobile-toggle {
        display: flex;
    }

    /* 開啟時鎖卷軸 */
    body.has-mobile-nav-open { overflow: hidden; }
}

@media (prefers-reduced-motion: reduce) {
    .site-header__mobile-toggle,
    .site-header__mobile-toggle-bar { transition: none; }
}