/* ═══════════════════════════════════════════════
   Book Comments: Tab 切換 + 留言聚合（時間軸）
   ═══════════════════════════════════════════════ */

/* ─── Tab 導航：Grid 定位 ─── */

/* 書頁：拉掉 container 上方間距，讓 tab 緊貼 gh-archive-inner 底線 */
.gh-container.is-list:has(#book-tabs-nav) {
    margin-top: -24px; /* 吸收 .gh-archive 的 margin-bottom */
}
.gh-container.is-list:has(#book-tabs-nav) > .gh-container-inner {
    padding-top: 0 !important; /* 移除容器上方 padding */
}

.book-tabs-nav {
    grid-column: 5 / span 8;
    margin-bottom: 3.6rem;
    min-height: 56px; /* 預留高度，防止 JS 填入 Tab 時 layout shift */
}

.gh-container.has-sidebar .book-tabs-nav {
    grid-column: 3 / span 8;
}

/* ─── 留言面板：Grid 定位（與 IOC 同位置） ─── */
.book-comments-panel {
    grid-column: 5 / span 8;
}

.gh-container.has-sidebar .book-comments-panel {
    grid-column: 3 / span 8;
}

/* ═══════════════════════════════════════════════
   底線 Tab（underline）
   選中：accent color 底線 + 深色字
   未選中：灰色字，hover 變深
   底部有一條淺灰底線貫穿
   ═══════════════════════════════════════════════ */

.book-tabs {
    display: flex;
    width: 100%;
    /* 不加 border-bottom — 依附 gh-archive-inner 的底線即可，減少線條 */
}

.book-tabs .book-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.2rem;
    padding: 12px 20px;
    border: none;
    background: transparent;
    color: var(--color-secondary-text, #999);
    cursor: pointer;
    font-size: 1.8rem; /* 未選中稍小 */
    font-weight: 600;
    transition: color 0.2s ease;
    white-space: nowrap;
    position: relative;
}

.book-tabs .book-tab.active {
    color: var(--color-primary-text, #15171a);
    font-size: 2.4rem;
}

.book-tabs .book-tab:hover:not(.active) {
    color: var(--color-primary-text, #333);
}

.book-tabs .book-tab-count {
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--color-secondary-text, #999);
}

.book-tabs .book-tab.active .book-tab-count {
    font-size: 1.4rem;
    color: var(--color-secondary-text, #777);
}

/* ─── 共用 Tab Label ─── */
.book-tab-label {
    /* 讓 label 和 count 水平排列 */
}

/* ─── 計數 loading 脈衝（JS 載入前） ─── */
.bc-loading {
    animation: bc-pulse 1.5s ease-in-out infinite;
}

@keyframes bc-pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

/* ═══════════════════════════════════════════════
   留言面板內容
   ═══════════════════════════════════════════════ */

/* 防劇透提示 */
.book-comments-spoiler-notice {
    font-size: 1.5rem;
    color: var(--color-secondary-text, #999);
    text-align: center;
    margin: 0 0 2rem;
}

/* 排序列 */
.book-comments-header {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    margin-bottom: 0.8rem;
}

.book-comments-sort-wrap {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.book-comments-sort-label {
    font-size: 1.4rem;
    color: var(--color-secondary-text, #999);
}

.book-comments-sort-dropdown {
    position: relative;
}

.book-comments-sort-trigger {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--color-primary-text, #15171a);
}

.book-comments-sort-trigger svg {
    width: 10px;
    height: 10px;
    transition: transform 0.2s ease;
}

.book-comments-sort-menu {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    left: -8px;
    min-width: 100px;
    background: #fff;
    border: 1px solid var(--color-border, #e1e1e1);
    border-radius: 8px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    z-index: 10;
}

.book-comments-sort-menu.open {
    display: block;
}

.book-comments-sort-option {
    display: block;
    width: 100%;
    padding: 8px 16px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 1.4rem;
    color: var(--color-primary-text, #15171a);
    text-align: left;
    transition: background 0.15s ease;
}

.book-comments-sort-option:hover {
    background: rgba(0, 0, 0, 0.04);
}

.book-comments-sort-option.active {
    font-weight: 600;
}

/* ─── 留言列表 ─── */
.book-comments-list {
    /* 時間軸容器 */
}

/* 單則留言 */
.book-comment {
    padding: 1.2rem 0;
}

/* 來源章節標示 — 位於名字下方 */
.book-comment-source {
    font-size: 1.3rem;
    line-height: 1.4;
    font-weight: 400;
    color: var(--color-secondary-text, #999);
    margin-bottom: 0.4rem;
}

.has-sans-body .book-comment-source {
    font-family: var(--font-sans);
}

.has-serif-body .book-comment-source {
    font-family: var(--font-serif-alt);
}

.book-comment-source a {
    color: var(--color-secondary-text, #999);
    text-decoration: none;
}

/* #2: hover 統一用 accent color（light + dark mode） */
.book-comment-source a:hover {
    color: var(--ghost-accent-color);
}

/* ─── Members Only Post 鎖頭 icon ─── */
.book-comment-lock {
    display: inline-block;
    width: 14px;
    height: 14px;
    margin-left: 0.4em;
    vertical-align: middle;
    color: var(--color-secondary-text, #999);
    flex-shrink: 0;
    position: relative;
    top: -1px;
}

/* 留言主體 */
.book-comment-body {
    display: flex;
    gap: 1.2rem;
}

/* ─── 頭像：疊層設計（彩色底 + initial letter + Gravatar）─── */
.book-comment-avatar-wrap {
    position: relative;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    flex-shrink: 0;
    overflow: hidden;
    /* 底色由 JS inline style 設定（nameToColor） */
}

.book-comment-avatar-initial {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    font-weight: 600;
    color: #fff;
    pointer-events: none;
}

.book-comment-avatar {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.book-comment-main {
    flex: 1;
    min-width: 0;
}

.book-comment-meta {
    display: flex;
    align-items: baseline;
    gap: 0;
    margin-bottom: 0.3rem;
}

.book-comment-name {
    font-weight: 700;
    font-size: 1.4rem;
    line-height: 1.4;
    color: var(--color-primary-text, #15171a);
}

.book-comment-sep {
    margin: 0 0.4em;
    color: var(--color-secondary-text, #999);
    font-size: 1.3rem;
}

.book-comment-time {
    font-size: 1.3rem;
    color: var(--color-secondary-text, #999);
}

.book-comment-text {
    font-size: 1.5rem;
    line-height: 1.6;
    color: var(--color-primary-text, #333);
    word-break: break-word;
}

.book-comment-text p {
    margin: 0 0 0.5em;
}

.book-comment-text p:last-child {
    margin-bottom: 0;
}

.book-comment-text a {
    color: var(--ghost-accent-color, #c05b4d);
    text-decoration: none;
}

.book-comment-text a:hover {
    text-decoration: underline;
}

/* 非會員遮蔽：Members Only Post 灰字 */
.book-comment-masked {
    color: var(--color-secondary-text, #999);
    font-style: italic;
}

.book-comment-footer {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    margin-top: 0.4rem;
}

/* #7: 用系統色，dark mode 自動切換 */
.book-comment-likes {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 1.3rem;
    color: var(--color-secondary-text, #999);
}

.book-comment-likes svg {
    width: 16px;
    height: 16px;
}

/* ─── 回覆（縮排） ─── */
.book-comment-replies {
    margin-left: 44px;
    margin-top: 0.6rem;
    padding-left: 1.2rem;
    border-left: 2px solid var(--color-border, #eee);
}

.book-comment-reply {
    padding: 0.6rem 0;
}

.book-comment-reply .book-comment-body {
    gap: 1rem;
}

.book-comment-reply .book-comment-avatar-wrap {
    width: 28px;
    height: 28px;
}

.book-comment-reply .book-comment-avatar-initial {
    font-size: 1.2rem;
}

.book-comment-reply .book-comment-name {
    font-size: 1.4rem;
}

.book-comment-reply .book-comment-text {
    font-size: 1.5rem;
}

.book-comment-reply .book-comment-time {
    font-size: 1.2rem;
}

/* ─── 展開更多回覆 — Ghost 原生 pill 風格 ─── */
.book-comment-replies-toggle-wrap {
    margin-left: 44px;
    margin-top: 0.6rem;
    margin-bottom: 0.6rem;
}

/* #7: 用系統色 — var(--color-lighter-gray) + var(--color-secondary-text) */
.book-comment-replies-toggle {
    display: inline-flex;
    align-items: center;
    height: 40px;
    padding: 0 16px;
    border: none;
    border-radius: 6px;
    background: var(--color-lighter-gray, #f0f0f0);
    cursor: pointer;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-secondary-text, #666);
    transition: background 0.15s ease;
    white-space: nowrap;
}

.book-comment-replies-toggle span {
    margin-left: 0.3em;
}

.book-comment-replies-toggle:hover {
    background: var(--color-border, #e1e1e1);
    color: var(--color-primary-text, #333);
}

/* ─── 載入更多按鈕 — Ghost 原生 pill 風格 ─── */
.book-comments-more-wrap {
    display: flex;
    justify-content: flex-start;
    margin-top: 1.2rem;
    margin-bottom: 1rem;
}

.book-comments-more {
    display: inline-flex;
    align-items: center;
    height: 40px;
    padding: 0 16px;
    border: none;
    border-radius: 6px;
    background: var(--color-lighter-gray, #f0f0f0);
    cursor: pointer;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-secondary-text, #666);
    transition: background 0.15s ease;
    white-space: nowrap;
}

.book-comments-more span {
    margin-left: 0.3em;
}

.book-comments-more:hover {
    background: var(--color-border, #e1e1e1);
    color: var(--color-primary-text, #333);
}

/* ─── Loading 狀態（fetch 留言中）─── */
.book-comments-loading {
    text-align: center;
    padding: 3rem;
    color: var(--color-secondary-text, #999);
    font-size: 1.5rem;
}

.book-comments-loading::after {
    content: '';
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid var(--color-border, #ddd);
    border-top-color: var(--ghost-accent-color);
    border-radius: 50%;
    animation: bc-spin 0.8s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}

@keyframes bc-spin {
    to { transform: rotate(360deg); }
}

/* ─── 空狀態 ─── */
.book-comments-empty {
    text-align: center;
    color: var(--color-secondary-text, #999);
    padding: 4rem 1rem;
    font-size: 1.5rem;
}

/* ═══════════════════════════════════════════════
   Dark Mode
   所有用 var() 的屬性會自動切換，
   這裡只處理 var() 無法覆蓋的特殊情況
   ═══════════════════════════════════════════════ */

/* Tab — dark mode */
.has-light-text .book-tabs .book-tab {
    color: rgba(255, 255, 255, 0.45);
}

.has-light-text .book-tabs .book-tab.active {
    color: rgba(255, 255, 255, 0.95);
}

.has-light-text .book-tabs .book-tab:hover:not(.active) {
    color: rgba(255, 255, 255, 0.75);
}

.has-light-text .book-tabs .book-tab-count {
    color: rgba(255, 255, 255, 0.4);
}

/* #2: dark mode 下章節 hover 也用 accent color */
.has-light-text .book-comment-source a:hover {
    color: var(--ghost-accent-color);
}

.has-light-text .book-comment-lock {
    color: rgba(255, 255, 255, 0.5);
}

/* 排序 dark mode */
.has-light-text .book-comments-sort-menu {
    background: var(--background-color, #2a2a2a);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
}

.has-light-text .book-comments-sort-option:hover {
    background: rgba(255, 255, 255, 0.08);
}

/* ═══════════════════════════════════════════════
   響應式
   ═══════════════════════════════════════════════ */

@media (max-width: 1023px) {
    .book-tabs-nav,
    .book-comments-panel {
        /* grid 變 block，不需要 grid-column */
    }
}

@media (max-width: 767px) {
    .book-tabs .book-tab {
        padding: 10px 12px;
        font-size: 1.8rem;
    }

    .book-comment-replies {
        margin-left: 2rem;
    }

    .book-comment-replies-toggle-wrap {
        margin-left: 2rem;
    }
}