/**
 * 後台管理 - 側邊欄樣式
 * Admin Sidebar Styles（導覽連結、分組手風琴、選單 badge、收合狀態）
 * 黑金/白金主題 (Black-Gold / White-Gold Theme)
 *
 * 由 admin-layout.css 拆出，緊接其後載入（見 src/lib/assets.ts 的 ADMIN_STYLES）。
 * 這裡的選擇器與 admin-layout.css 不重疊，但仍請維持載入順序：手機版的抽屜規則在
 * responsive/viewport-desktop.css，必須排在本檔之後才蓋得過桌機寬度。
 */

/* ==================== 側邊欄動畫 ==================== */
@keyframes adminNavItemFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== 側邊欄 (後台專用) ==================== */
.admin-page .sidebar {
    width: 16rem;
    background: linear-gradient(180deg, rgba(18, 16, 12, 0.98) 0%, rgba(12, 10, 8, 0.99) 100%);
    border-right: 1px solid rgba(212, 165, 32, 0.1);
    /* expo-out 把大部分位移集中在前段，主內容區重排的幀數也跟著集中、縮短 */
    transition: width var(--motion-medium) var(--ease-out-expo);
    overflow-y: auto;
    flex-shrink: 0;
}

.admin-page.light-theme .sidebar {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(248, 246, 240, 0.99) 100%);
    border-right: 1px solid rgba(184, 134, 11, 0.12);
}

.admin-page .sidebar.collapsed {
    width: 4rem;
}

.admin-page .sidebar.collapsed .nav-link span {
    display: none;
}

.admin-page .sidebar.collapsed .nav-link {
    justify-content: center;
    padding: 1rem;
}

.admin-page .sidebar.collapsed .nav-link i {
    margin-right: 0;
    font-size: 1.25rem;
}

/* 側邊欄咖啡按鈕 */
.admin-page .sidebar-coffee {
    padding: 1rem;
    margin-top: auto;
    border-top: 1px solid rgba(212, 165, 32, 0.1);
    transform: scale(0.72);
    transform-origin: left center;
    transition:
        opacity var(--motion-base) var(--ease-out-quart),
        visibility var(--motion-base) var(--ease-out-quart);
}

.admin-page.light-theme .sidebar-coffee {
    border-top-color: rgba(184, 134, 11, 0.1);
}

.admin-page .sidebar.collapsed .sidebar-coffee {
    opacity: 0;
    visibility: hidden;
    position: absolute;
    pointer-events: none;
}

/* 側邊欄遮罩 */
.admin-page .sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    -webkit-backdrop-filter: blur(3px);
    backdrop-filter: blur(3px);
    z-index: 1400;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
        opacity var(--motion-base) var(--ease-in-quart),
        visibility 0s linear var(--motion-base);
}

.admin-page .sidebar-overlay.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition:
        opacity var(--motion-medium) var(--ease-out-quart),
        visibility 0s;
}

.admin-page .sidebar-nav {
    padding: 1rem 0;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.admin-page .nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.admin-page .nav-item {
    margin: 0.25rem 0.5rem;
}

/* 側邊欄切換動畫 - 隱藏階段（作用於頂層項目：儀表板與各分組） */
.admin-page .sidebar.sidebar--hiding .nav-list > li {
    opacity: 0 !important;
    visibility: hidden !important;
    transition: none !important;
}

/* 側邊欄切換動畫 - 動畫階段 */
.admin-page .sidebar.sidebar--animating .nav-list > li {
    animation: adminNavItemFadeIn var(--motion-base) var(--ease-out-expo) backwards;
}

/* 由下往上依序出現的延遲 */
.admin-page .sidebar.sidebar--animating .nav-list > li:nth-child(6) { animation-delay: 0.06s; }
.admin-page .sidebar.sidebar--animating .nav-list > li:nth-child(5) { animation-delay: 0.09s; }
.admin-page .sidebar.sidebar--animating .nav-list > li:nth-child(4) { animation-delay: 0.12s; }
.admin-page .sidebar.sidebar--animating .nav-list > li:nth-child(3) { animation-delay: 0.15s; }
.admin-page .sidebar.sidebar--animating .nav-list > li:nth-child(2) { animation-delay: 0.18s; }
.admin-page .sidebar.sidebar--animating .nav-list > li:nth-child(1) { animation-delay: 0.21s; }

.admin-page .nav-link {
    position: relative;
    isolation: isolate;
    display: flex;
    align-items: center;
    padding: 0.875rem 1.25rem;
    color: #b0b0b0;
    text-decoration: none;
    border-radius: 0.5rem;
    transition:
        color var(--motion-fast) var(--ease-out-quart),
        border-color var(--motion-base) var(--ease-out-quart);
    font-weight: 500;
    border-left: 3px solid transparent;
}

/* 兩層底色都畫在偽元素上：漸層（background-image）無法補間，畫在連結本身只能
   瞬間切換。::before 是 active 的金色底，::after 是 hover 的淡金色 */
.admin-page .nav-link::before,
.admin-page .nav-link::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -1;
    border-radius: inherit;
    pointer-events: none;
}

.admin-page .nav-link::after {
    background: linear-gradient(90deg, rgba(212, 165, 32, 0.1) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--motion-fast) var(--ease-out-quart);
}

/* 切頁時由 js/core/route-motion.js 讓它從舊連結滑過來；無法滑動時（目標分組
   剛要展開）退回這裡的「由左側展開」 */
.admin-page .nav-link::before {
    background: linear-gradient(90deg, rgba(212, 165, 32, 0.2) 0%, rgba(184, 134, 11, 0.1) 100%);
    opacity: 0;
    transform: scaleX(0.4);
    transform-origin: 0 0;
    transition:
        opacity var(--motion-fast) var(--ease-out-quart),
        transform var(--motion-medium) var(--ease-out-expo);
}

.admin-page .nav-link:hover::after {
    opacity: 1;
}

.admin-page .nav-link.active::before {
    opacity: 1;
    transform: none;
}

/* 滑動期間暫停偽元素的 transition：CSS transition 在串接中的優先權高於動畫，
   新連結的展開過渡若同時在跑，會把滑動整段蓋掉 */
.admin-page .sidebar-nav.is-gliding .nav-link::before {
    transition: none;
}

.admin-page .nav-link i {
    width: 1.5rem;
    margin-right: 0.75rem;
    font-size: 1.125rem;
    text-align: center;
    transition: translate var(--motion-base) var(--ease-spring);
}

/* hover 時圖示往右推一點：指向「點下去會前往」 */
.admin-page .nav-link:hover i {
    translate: 0.125rem 0;
}

.admin-page .nav-link:hover {
    color: var(--admin-gold-light);
    border-left-color: rgba(212, 165, 32, 0.5);
}

.admin-page .nav-link.active {
    color: var(--admin-primary);
    border-left-color: var(--admin-primary);
}

.admin-page.light-theme .nav-link {
    color: #666;
}

.admin-page.light-theme .nav-link::after {
    background: linear-gradient(90deg, rgba(184, 134, 11, 0.08) 0%, transparent 100%);
}

.admin-page.light-theme .nav-link::before {
    background: linear-gradient(90deg, rgba(184, 134, 11, 0.12) 0%, rgba(139, 105, 20, 0.06) 100%);
}

.admin-page.light-theme .nav-link:hover {
    color: var(--admin-primary-dark);
    border-left-color: rgba(184, 134, 11, 0.5);
}

.admin-page.light-theme .nav-link.active {
    color: var(--admin-primary-dark);
    border-left-color: var(--admin-primary-dark);
}

/* ==================== 側邊欄分組（手風琴） ==================== */

/* 分組標題刻意做成「區段標籤」而非另一顆導航按鈕：字級與顏色都低一階，
   讓子項目仍是視線焦點，不與實際可前往的頁面搶權重 */
.admin-page .nav-group {
    margin: 0.25rem 0.5rem;
}

.admin-page .nav-group-toggle {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
    padding: 0.75rem 1.25rem;
    background: none;
    border: none;
    border-left: 3px solid transparent;
    border-radius: 0.5rem;
    color: #8a8a8a;
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-align: left;
    cursor: pointer;
    transition:
        color var(--motion-fast) var(--ease-out-quart),
        background var(--motion-fast) var(--ease-out-quart),
        border-color var(--motion-fast) var(--ease-out-quart);
}

.admin-page .nav-group-toggle > i:first-child {
    width: 1.5rem;
    margin-right: 0.75rem;
    font-size: 1rem;
    text-align: center;
}

.admin-page .nav-group-toggle > span {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.admin-page .nav-group-caret {
    flex-shrink: 0;
    margin-left: 0.5rem;
    font-size: 0.6875rem;
    opacity: 0.7;
    transition: transform var(--motion-spring) var(--ease-spring);
}

.admin-page .nav-group.expanded .nav-group-caret {
    transform: rotate(180deg);
}

.admin-page .nav-group-toggle:hover {
    background: linear-gradient(90deg, rgba(212, 165, 32, 0.08) 0%, transparent 100%);
    color: var(--admin-gold-light);
}

.admin-page .nav-group-toggle:focus-visible {
    outline: 2px solid var(--admin-primary);
    outline-offset: -2px;
}

.admin-page .nav-group.expanded .nav-group-toggle {
    color: var(--admin-primary);
}

/* 分組收合時仍以金色描邊與圓點標示「目前頁面在這一組」 */
.admin-page .nav-group.has-active:not(.expanded) .nav-group-toggle {
    color: var(--admin-primary);
    border-left-color: rgba(212, 165, 32, 0.45);
}

.admin-page .nav-group.has-active:not(.expanded) .nav-group-toggle::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 2.5rem;
    width: 0.375rem;
    height: 0.375rem;
    margin-top: -0.1875rem;
    border-radius: 50%;
    background: var(--admin-primary);
}

/* 展開面板：0fr → 1fr 讓高度隨內容自動過渡，不需為各分組硬寫 max-height */
.admin-page .nav-group-panel {
    display: grid;
    grid-template-rows: 0fr;
    /* 高度歸零只是視覺裁切，仍可被 Tab 聚焦；靠 visibility 把收合的子項移出
       tab 順序與報讀器。切換延後到收合動畫結束，展開時則立即生效 */
    visibility: hidden;
    transition:
        grid-template-rows var(--motion-base) var(--ease-standard),
        visibility 0s linear var(--motion-base);
}

.admin-page .nav-group.expanded .nav-group-panel {
    grid-template-rows: 1fr;
    visibility: visible;
    transition:
        grid-template-rows var(--motion-medium) var(--ease-out-expo),
        visibility 0s;
}

/* 子項目隨面板展開依序滑入；收合時一起淡出，不逐一等待 */
.admin-page .nav-sublist .nav-item {
    opacity: 0;
    translate: -0.375rem 0;
    transition:
        opacity var(--motion-fast) var(--ease-out-quart),
        translate var(--motion-fast) var(--ease-out-quart);
}

.admin-page .nav-group.expanded .nav-sublist .nav-item {
    opacity: 1;
    translate: none;
    transition:
        opacity var(--motion-base) var(--ease-out-quart),
        translate var(--motion-medium) var(--ease-out-expo);
}

.admin-page .nav-group.expanded .nav-sublist .nav-item:nth-child(2) { transition-delay: 30ms; }
.admin-page .nav-group.expanded .nav-sublist .nav-item:nth-child(3) { transition-delay: 60ms; }
.admin-page .nav-group.expanded .nav-sublist .nav-item:nth-child(n + 4) { transition-delay: 90ms; }

/* 還原上次的展開狀態時不播：那是「原本就開著」，不是使用者剛點開
   （class 由 js/core/sidebar-nav.js 的 initSidebarNav 在還原期間掛上） */
.admin-page .sidebar.is-restoring .nav-group-panel,
.admin-page .sidebar.is-restoring .nav-group-caret,
.admin-page .sidebar.is-restoring .nav-sublist .nav-item {
    transition: none;
}

.admin-page .nav-sublist {
    list-style: none;
    min-height: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

/* 子項目縮排並帶一條導引線，讓從屬層級不必靠背景色也讀得出來 */
.admin-page .nav-sublist .nav-item {
    margin: 0.125rem 0 0.125rem 1.375rem;
    border-left: 1px solid rgba(212, 165, 32, 0.15);
}

.admin-page .nav-sublist .nav-item:first-child {
    margin-top: 0.25rem;
}

.admin-page .nav-sublist .nav-item:last-child {
    margin-bottom: 0.375rem;
}

.admin-page .nav-sublist .nav-link {
    padding: 0.625rem 0.75rem;
    border-radius: 0 0.5rem 0.5rem 0;
}

/* 子項目改由導引線表示層級，不再額外畫左側粗邊 */
.admin-page .nav-sublist .nav-link,
.admin-page .nav-sublist .nav-link:hover,
.admin-page .nav-sublist .nav-link.active {
    border-left-width: 0;
}

/* 淺色主題 */
.admin-page.light-theme .nav-group-toggle {
    color: #8b7d5a;
}

.admin-page.light-theme .nav-group-toggle:hover {
    background: linear-gradient(90deg, rgba(184, 134, 11, 0.07) 0%, transparent 100%);
    color: var(--admin-primary-dark);
}

.admin-page.light-theme .nav-group.expanded .nav-group-toggle,
.admin-page.light-theme .nav-group.has-active:not(.expanded) .nav-group-toggle {
    color: var(--admin-primary-dark);
}

.admin-page.light-theme .nav-group.has-active:not(.expanded) .nav-group-toggle {
    border-left-color: rgba(184, 134, 11, 0.45);
}

.admin-page.light-theme .nav-group.has-active:not(.expanded) .nav-group-toggle::after {
    background: var(--admin-primary-dark);
}

.admin-page.light-theme .nav-sublist .nav-item {
    border-left-color: rgba(184, 134, 11, 0.18);
}

/* 側邊欄收合（僅剩圖示）時分組標題退為分隔線，子項一律攤平，
   否則使用者會看到一排無法展開的群組圖示、點不到任何頁面 */
.admin-page .sidebar.collapsed .nav-group-toggle {
    justify-content: center;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    border-top: 1px solid rgba(212, 165, 32, 0.12);
    border-left: none;
    border-radius: 0;
    cursor: default;
    pointer-events: none;
    opacity: 0.55;
}

.admin-page.light-theme .sidebar.collapsed .nav-group-toggle {
    border-top-color: rgba(184, 134, 11, 0.15);
}

.admin-page .sidebar.collapsed .nav-group-toggle > span,
.admin-page .sidebar.collapsed .nav-group-caret {
    display: none;
}

.admin-page .sidebar.collapsed .nav-group.has-active .nav-group-toggle::after {
    display: none;
}

.admin-page .sidebar.collapsed .nav-group-toggle > i:first-child {
    margin-right: 0;
    font-size: 0.875rem;
}

.admin-page .sidebar.collapsed .nav-group-panel {
    grid-template-rows: 1fr;
    visibility: visible;
}

.admin-page .sidebar.collapsed .nav-sublist .nav-item {
    margin-left: 0.5rem;
    margin-right: 0.5rem;
    border-left: none;
    /* 收成圖示列時面板一律攤平，子項目不受「分組是否展開」的淡入控制 */
    opacity: 1;
    translate: none;
}

.admin-page .sidebar.collapsed .nav-sublist .nav-link {
    border-radius: 0.5rem;
}

/* 不支援 grid-template-rows 過渡的瀏覽器：退回無動畫的顯示／隱藏 */
@supports not (grid-template-rows: 0fr) {
    .admin-page .nav-group-panel {
        display: block;
        height: 0;
        overflow: hidden;
    }

    .admin-page .nav-group.expanded .nav-group-panel,
    .admin-page .sidebar.collapsed .nav-group-panel {
        height: auto;
        visibility: visible;
    }
}

/* 使用者偏好減少動態時，展開直接到位 */
@media (prefers-reduced-motion: reduce) {
    .admin-page .nav-group-panel,
    .admin-page .nav-group-caret {
        transition: none;
    }
}

/* ══════════════════════════════════════════════════════════════════════
   選單待簽核數量 badge
   ══════════════════════════════════════════════════════════════════════

   由 js/core/auth/permission-ui.js 的 setApprovalBadge() 動態插入／移除。
   0 時整個節點被移除（不是顯示 "0"）——一個寫著 0 的紅點是純粹的視覺噪音。

   放在全域的側邊欄樣式（而非 pages/*.css）是因為側邊欄屬於 shell，首屏就存在；
   放進 pages/*.css 會讓切到第一個子頁之前 badge 都沒有樣式。 */

.nav-link .nav-badge {
    transition:
        scale var(--motion-spring) var(--ease-spring-bouncy),
        opacity var(--motion-fast) var(--ease-out-quart);
    margin-left: auto;
    min-width: 1.25rem;
    padding: 0.0625rem 0.375rem;
    border-radius: 999px;
    background: #ef4444;
    color: #fff;
    font-size: 0.6875rem;
    font-weight: 700;
    line-height: 1.4;
    text-align: center;
}

/* 由 permission-ui.js 插入的那一刻從 0 彈出：數字出現本身就是提醒，給它一點存在感 */
@starting-style {
    .nav-link .nav-badge {
        scale: 0.3;
        opacity: 0;
    }
}

/* 側邊欄收合時只剩圖示，badge 縮成一個角標而不是撐開版面 */
.sidebar.collapsed .nav-link .nav-badge {
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    min-width: 0.5rem;
    height: 0.5rem;
    padding: 0;
    font-size: 0;
    line-height: 0;
}

/* 沒有權限的選單項目與群組：permission-ui.js 以 is-hidden 控制，
   這裡不另外定義——utilities.css 已有 .is-hidden { display: none !important } */