/* extras.css — Pinghsu theme additions (Batch 2+) */

/* ─── Accessibility helpers ─────────────────────────────────────────────── */

/* Visually hidden but readable by screen readers */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* sr-only that becomes visible on focus (for skip links) */
.sr-only-focusable:focus,
.sr-only-focusable:active {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Skip-to-content link */
.skip-link {
    position: absolute;
    top: -100%;
    left: 8px;
    z-index: 9999;
    padding: 8px 16px;
    background: #eb5055;
    color: #fff;
    border-radius: 0 0 4px 4px;
    font-size: 14px;
    text-decoration: none;
    transition: top 0.2s;
}
.skip-link:focus {
    top: 0;
}

/* ─── Print ─────────────────────────────────────────────────────────────── */

@media print {
    .header,
    .footer,
    .post-bottom-bar,
    .directory-content,
    .navbar-mobile-menu,
    .related-post-lists,
    .comment-container,
    .lists-navigator {
        display: none !important;
    }
    body {
        background: #fff !important;
        color: #000 !important;
        font-size: 12pt;
    }
    .post-page,
    .page-page {
        max-width: 100% !important;
        padding: 0 !important;
    }
    .post-header-thumb {
        display: none !important;
    }
    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 9pt;
        color: #555;
    }
    a[href^="#"]::after,
    a[href^="javascript:"]::after {
        content: "";
    }
}

/* ─── Homepage card polish ──────────────────────────────────────────────── */

/* Lift + shadow on hover */
.post-list-item-container {
    border-radius: 6px;
    overflow: hidden;
    transition: transform .25s ease, box-shadow .25s ease;
    will-change: transform;
}
.post-list-item-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 28px rgba(0, 0, 0, .13);
}

/* Thumb zoom on hover */
.item-thumb {
    transition: transform .45s ease;
}
.post-list-item-container:hover .item-thumb {
    transform: scale(1.06);
}

/* Title hover colour */
.item-label .item-title a {
    transition: color .15s;
}
.item-label .item-title a:hover {
    color: var(--ph-accent, #eb5055);
}

/* Meta: tabular date, tighten line */
.item-meta-date time {
    font-variant-numeric: tabular-nums;
    letter-spacing: .02em;
}

/* Pagination: subtle style lift */
.lists-navigator {
    text-align: center;
    margin: 24px 0 16px;
}
.lists-navigator a,
.lists-navigator span {
    display: inline-block;
    padding: 6px 14px;
    margin: 0 3px;
    border-radius: 4px;
    transition: background .15s, color .15s;
}
.lists-navigator a:hover {
    background: var(--ph-accent, #eb5055);
    color: #fff;
}

/* ─── Dark mode ─────────────────────────────────────────────────────────── */

/* Light theme tokens (defaults) */
:root {
    --ph-bg:          #fff;
    --ph-bg-alt:      #f7f7f7;
    --ph-bg-card:     #fff;
    --ph-text:        #5f5f5f;
    --ph-text-dark:   #313131;
    --ph-accent:      #eb5055;
    --ph-border:      #e0e0e0;
    --ph-footer-bg:   #fff;
    --ph-code-bg:     #f4f4f4;
    --ph-shadow:      rgba(0,0,0,.08);
}

/* Dark theme tokens */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --ph-bg:        #1a1a1a;
        --ph-bg-alt:    #222;
        --ph-bg-card:   #252525;
        --ph-text:      #c8c8c8;
        --ph-text-dark: #e0e0e0;
        --ph-accent:    #f0686d;
        --ph-border:    #333;
        --ph-footer-bg: #1e1e1e;
        --ph-code-bg:   #2d2d2d;
        --ph-shadow:    rgba(0,0,0,.4);
    }
}
:root[data-theme="dark"] {
    --ph-bg:        #1a1a1a;
    --ph-bg-alt:    #222;
    --ph-bg-card:   #252525;
    --ph-text:      #c8c8c8;
    --ph-text-dark: #e0e0e0;
    --ph-accent:    #f0686d;
    --ph-border:    #333;
    --ph-footer-bg: #1e1e1e;
    --ph-code-bg:   #2d2d2d;
    --ph-shadow:    rgba(0,0,0,.4);
}
:root[data-theme="light"] {
    --ph-bg:        #fff;
    --ph-bg-alt:    #f7f7f7;
    --ph-bg-card:   #fff;
    --ph-text:      #5f5f5f;
    --ph-text-dark: #313131;
    --ph-accent:    #eb5055;
    --ph-border:    #e0e0e0;
    --ph-footer-bg: #fff;
    --ph-code-bg:   #f4f4f4;
    --ph-shadow:    rgba(0,0,0,.08);
}

/* Apply dark mode tokens to structural elements */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) body,
    :root:not([data-theme="light"]) .bg-white { background-color: var(--ph-bg) !important; color: var(--ph-text); }
    :root:not([data-theme="light"]) .bg-grey   { background-color: var(--ph-bg-alt) !important; }
    :root:not([data-theme="light"]) .header,
    :root:not([data-theme="light"]) .footer    { background-color: var(--ph-bg) !important; }
    :root:not([data-theme="light"]) .post-content,
    :root:not([data-theme="light"]) .post-onelist-item,
    :root:not([data-theme="light"]) .post-list-item-container { background-color: var(--ph-bg-card) !important; color: var(--ph-text); }
    :root:not([data-theme="light"]) .post-content h1,
    :root:not([data-theme="light"]) .post-content h2,
    :root:not([data-theme="light"]) .post-content h3,
    :root:not([data-theme="light"]) .post-content h4,
    :root:not([data-theme="light"]) .post-content h5,
    :root:not([data-theme="light"]) .post-content h6,
    :root:not([data-theme="light"]) .post-title,
    :root:not([data-theme="light"]) .item-title a,
    :root:not([data-theme="light"]) .navbar-logo { color: var(--ph-text-dark) !important; }
    :root:not([data-theme="light"]) .post-content pre,
    :root:not([data-theme="light"]) .post-content code { background-color: var(--ph-code-bg) !important; color: var(--ph-text-dark) !important; border-color: var(--ph-border) !important; }
    :root:not([data-theme="light"]) .post-info  { border-top-color: var(--ph-border) !important; }
    :root:not([data-theme="light"]) a           { color: var(--ph-accent); }
    :root:not([data-theme="light"]) .navbar-container { border-bottom-color: var(--ph-border) !important; }
    :root:not([data-theme="light"]) .comment-view { background-color: var(--ph-bg-card) !important; }
    :root:not([data-theme="light"]) .meta-title { color: var(--ph-text-dark) !important; }
}
[data-theme="dark"] body,
[data-theme="dark"] .bg-white { background-color: var(--ph-bg) !important; color: var(--ph-text); }
[data-theme="dark"] .bg-grey  { background-color: var(--ph-bg-alt) !important; }
[data-theme="dark"] .header,
[data-theme="dark"] .footer   { background-color: var(--ph-bg) !important; }
[data-theme="dark"] .post-content,
[data-theme="dark"] .post-onelist-item,
[data-theme="dark"] .post-list-item-container { background-color: var(--ph-bg-card) !important; color: var(--ph-text); }
[data-theme="dark"] .post-content h1,
[data-theme="dark"] .post-content h2,
[data-theme="dark"] .post-content h3,
[data-theme="dark"] .post-content h4,
[data-theme="dark"] .post-content h5,
[data-theme="dark"] .post-content h6,
[data-theme="dark"] .post-title,
[data-theme="dark"] .item-title a,
[data-theme="dark"] .navbar-logo { color: var(--ph-text-dark) !important; }
[data-theme="dark"] .post-content pre,
[data-theme="dark"] .post-content code { background-color: var(--ph-code-bg) !important; color: var(--ph-text-dark) !important; border-color: var(--ph-border) !important; }
[data-theme="dark"] .post-info  { border-top-color: var(--ph-border) !important; }
[data-theme="dark"] a           { color: var(--ph-accent); }
[data-theme="dark"] .navbar-container { border-bottom-color: var(--ph-border) !important; }
[data-theme="dark"] .comment-view { background-color: var(--ph-bg-card) !important; }
[data-theme="dark"] .meta-title { color: var(--ph-text-dark) !important; }

/* Dark mode toggle button */
#dm-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    margin-left: 8px;
    border: none;
    border-radius: 50%;
    background: transparent;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    vertical-align: middle;
    transition: background .2s;
    color: inherit;
}
#dm-toggle:hover { background: rgba(128,128,128,.15); }

/* ─── Back to top ───────────────────────────────────────────────────────── */

#back-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--ph-border, #e0e0e0);
    background: var(--ph-bg-card, #fff);
    color: var(--ph-text, #5f5f5f);
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    transform: translateY(16px);
    transition: opacity .25s, transform .25s;
    z-index: 200;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
}
#back-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
#back-top:hover {
    background: var(--ph-accent, #eb5055);
    color: #fff;
    border-color: var(--ph-accent, #eb5055);
}

/* ─── Code copy button ──────────────────────────────────────────────────── */

.code-copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 2px 8px;
    font-size: 11px;
    border: 1px solid var(--ph-border, #ddd);
    border-radius: 4px;
    background: var(--ph-bg, #fff);
    color: var(--ph-text, #5f5f5f);
    cursor: pointer;
    opacity: 0;
    transition: opacity .2s;
}
pre:hover .code-copy-btn { opacity: 1; }

/* ─── Reading time ──────────────────────────────────────────────────────── */

.read-time {
    font-size: inherit;
}

/* ─── Mobile TOC drawer ─────────────────────────────────────────────────── */

#toc-toggle {
    display: none;
}
@media (max-width: 1000px) {
    #toc-toggle {
        display: inline-block;
        margin: 16px 0 8px;
        padding: 4px 14px;
        border: 1px solid var(--ph-accent, #eb5055);
        border-radius: 20px;
        background: transparent;
        color: var(--ph-accent, #eb5055);
        font-size: 13px;
        cursor: pointer;
    }
    .directory-content { display: none; }
    .directory-content.toc-open {
        display: block;
        position: static;
        opacity: 1;
        max-width: 100%;
        margin: 0 0 16px !important;
    }
}

/* ─── Search page ──────────────────────────────────────────────────────── */

.search-hint {
    margin: 12px 0 6px;
    font-size: 13px;
    color: var(--ph-text, #767676);
}

/* ─── Search result highlight ───────────────────────────────────────────── */

.item-title mark {
    background: rgba(235, 80, 85, .18);
    color: var(--ph-accent, #eb5055);
    border-radius: 2px;
    padding: 0 2px;
}

/* ─── Timeline page ─────────────────────────────────────────────────────── */

.timeline-wrap {
    max-width: 760px;
    margin: 0 auto;
    padding: 32px 16px 48px;
}

.timeline-year-group {
    margin-bottom: 36px;
}

.timeline-year-node {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 12px;
}

.timeline-year-label {
    font-size: 26px;
    font-weight: 700;
    color: var(--ph-text-dark, #313131);
    letter-spacing: 1px;
}

.year-count {
    font-size: 12px;
    color: var(--ph-text, #999);
}

.timeline-list {
    list-style: none;
    padding: 0;
    margin: 0 0 0 13px;
    border-left: 2px solid var(--ph-border, #e8e8e8);
}

.timeline-item {
    display: flex;
    align-items: baseline;
    gap: 14px;
    padding: 7px 0 7px 22px;
    position: relative;
}

.timeline-dot {
    position: absolute;
    left: -5px;
    top: 12px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--ph-accent, #eb5055);
    flex-shrink: 0;
}

.timeline-date {
    font-size: 12px;
    color: var(--ph-text, #999);
    white-space: nowrap;
    min-width: 44px;
    font-variant-numeric: tabular-nums;
}

.timeline-title {
    color: var(--ph-text-dark, #444);
    text-decoration: none;
    font-size: 14px;
    line-height: 1.6;
    transition: color .15s;
}

.timeline-title:hover {
    color: var(--ph-accent, #eb5055);
}