/* ========================================
   文章 dock —— 阅读控制（Aa）+ 返回顶部 + 专注模式（仅文章页）
   专注模式经 <html class="is-focus-mode"> 驱动，避免 JS 直接改各组件内部。
   清爽轻量：柔和投影、近似不透明面板、浅遮罩。
   颜色一律 token 或 color-mix，禁止硬编码深色/十六进制。
   ======================================== */

:root {
    /* dock 几何令牌：toc.css 的目录胶囊据此排布在 dock 上方 */
    --article-dock-item: 44px;
    --article-dock-gap: 10px;
    --article-dock-bottom: max(20px, env(safe-area-inset-bottom));
    --article-dock-height: calc(var(--article-dock-item) * 2 + var(--article-dock-gap));
    /* 柔和投影：替代 --panel-shadow 的 4px 硬偏移，用于小型浮层 */
    --article-dock-shadow: 0 10px 30px rgba(0, 0, 0, 0.14), 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme='dark'] {
    --article-dock-shadow: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 12px 32px rgba(0, 0, 0, 0.5);
}

/* ===== 专注模式：隐藏外壳、正文居中加宽 ===== */
html.is-focus-mode .top-bar,
html.is-focus-mode .hero-sticky,
html.is-focus-mode .page-footer {
    display: none;
}

html.is-focus-mode .post-container {
    max-width: min(1000px, 100%);
}

/* ===== dock 容器（右下角纵向堆叠） ===== */
.article-dock {
    position: fixed;
    right: max(20px, env(safe-area-inset-right));
    bottom: var(--article-dock-bottom);
    z-index: 1490;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--article-dock-gap);
    pointer-events: none;
    transition:
        opacity 0.22s ease,
        transform 0.22s cubic-bezier(0.16, 1, 0.3, 1),
        visibility 0.22s;
}

/* 翻到正文开始前，整个 dock（Aa + 返回顶部）隐藏 */
.article-dock--hidden {
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
}

/* ===== 圆形 FAB（Aa / 返回顶部） ===== */
.article-dock__fab {
    pointer-events: auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: var(--article-dock-item);
    height: var(--article-dock-item);
    padding: 0;
    border: 1px solid color-mix(in srgb, var(--fg) 12%, transparent);
    border-radius: 50%;
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: var(--panel-blur);
    -webkit-backdrop-filter: var(--panel-blur);
    box-shadow: var(--article-dock-shadow);
    color: var(--fg);
    cursor: pointer;
    transition:
        background-color var(--transition-fast),
        color var(--transition-fast),
        border-color var(--transition-fast);
}

.article-dock__fab:hover:not(:disabled) {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.article-dock__fab:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.article-dock__fab--aa {
    font-family: var(--font-ui);
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1;
}

.article-dock__fab--active {
    border-color: var(--accent-blue);
    background: color-mix(in srgb, var(--accent-blue) 14%, var(--bg));
    color: var(--accent-blue);
}

/* ===== 「Aa」模态框（居中，层级高于目录，避免互相遮挡） ===== */
.article-dock__overlay {
    position: fixed;
    inset: 0;
    z-index: calc(var(--z-dock, 10000) + 20);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(0, 0, 0, 0.16);
}

.article-dock__popover {
    display: grid;
    width: min(360px, 100%);
    max-height: min(80dvh, 560px);
    overflow-y: auto;
    gap: 14px;
    padding: 16px;
    border: 1px solid color-mix(in srgb, var(--fg) 12%, transparent);
    border-radius: 16px;
    background: var(--bg);
    box-shadow: var(--article-dock-shadow);
    color: var(--fg);
    font-family: var(--font-ui);
    transform: scale(1);
    transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

.article-dock__popover:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.article-dock__popover-group {
    display: grid;
    gap: 8px;
}

.article-dock__popover-label {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}

.article-dock__popover-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-dock__popover-value {
    flex: 1;
    min-width: 3em;
    text-align: center;
    font-size: 0.85rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--fg);
}

/* ===== 弹出面板内按钮 ===== */
.article-dock__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    height: 36px;
    padding: 0 12px;
    border: 1px solid transparent;
    border-radius: 999px;
    background: transparent;
    color: var(--fg);
    font-family: var(--font-ui);
    font-size: 0.82rem;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    transition:
        background-color var(--transition-fast),
        color var(--transition-fast),
        border-color var(--transition-fast);
}

.article-dock__btn:hover:not(:disabled) {
    background: color-mix(in srgb, var(--fg) 8%, transparent);
}

.article-dock__btn:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.article-dock__btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.article-dock__btn--font {
    min-width: 34px;
    padding: 0 12px;
    font-size: 0.92rem;
    font-weight: 700;
}

.article-dock__btn--seg {
    flex: 1;
    border-color: color-mix(in srgb, var(--fg) 18%, transparent);
    color: var(--muted);
}

.article-dock__btn--active {
    border-color: var(--accent-blue);
    background: color-mix(in srgb, var(--accent-blue) 14%, transparent);
    color: var(--accent-blue);
}

.article-dock__btn--focus {
    width: 100%;
    border-color: color-mix(in srgb, var(--fg) 18%, transparent);
}

/* ===== 模态框过渡（遮罩淡入 + 面板轻微缩放） ===== */
.dock-popover-enter-from,
.dock-popover-leave-to {
    opacity: 0;
}

.dock-popover-enter-from .article-dock__popover,
.dock-popover-leave-to .article-dock__popover {
    transform: scale(0.96);
}

.dock-popover-enter-active,
.dock-popover-leave-active {
    transition: opacity 0.18s ease;
}

/* ===== 减弱动态：dock 与模态框不做任何动画 ===== */
@media (prefers-reduced-motion: reduce) {
    .article-dock,
    .article-dock__fab,
    .article-dock__btn,
    .article-dock__popover,
    .post-container {
        transition: none;
    }

    .dock-popover-enter-active,
    .dock-popover-leave-active {
        transition: none;
    }
}