/* =================================================================
   Blog Pages — v3 Neo-Brutalism
   navy + orange + butter | Bricolage + Hanken + Fraunces + JetBrains
   共用 landing.css nav + mobile menu + footer v3
   覆蓋：列表卡片、文章頁 markdown typography、TOC、share、related
   ================================================================= */

/* ------------------------------------------
   0. BODY OVERRIDE — 修復 sticky（post 頁 TOC/Share）
   ------------------------------------------ */
body.blog-post-page {
    overflow-y: visible !important;
    /* clip 不會與 overflow-y: visible 衝突（不像 hidden 會把 visible 變成 auto）
       且不會建立 scroll container，sticky 子元素可正常運作 */
    overflow-x: clip;
}

/* body 的 overflow 不會 propagate 到 viewport，html 也需顯式設定，避免裝飾性
   元素（傾斜卡片、box-shadow、寬 table）在手機端造成水平滑動 */
html:has(body.blog-post-page) {
    overflow-x: clip;
}

body.blog-page {
    font-family: var(--brand-v3-sans);
    color: var(--brand-v3-ink-soft);
    background: var(--brand-v3-cream);
}

/* em → Fraunces italic 強調（post body 內常見） */
body.blog-page em,
.blog-page .italic {
    font-family: var(--brand-v3-serif);
    font-style: italic;
    font-weight: 500;
    color: var(--brand-v3-orange);
    font-variation-settings: "opsz" 144;
}

/* ------------------------------------------
   1. BREADCRUMB
   ------------------------------------------ */
.blog-breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--brand-v3-mono);
    font-size: 11.5px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--brand-v3-muted);
    padding: 16px 0;
    max-width: 1160px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.blog-breadcrumb a {
    color: var(--brand-v3-muted);
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.2s ease;
}

.blog-breadcrumb a:hover {
    color: var(--brand-v3-orange);
}

.blog-breadcrumb-sep {
    color: var(--brand-v3-navy);
    opacity: 0.3;
    display: inline-flex;
    align-items: center;
    user-select: none;
}

.blog-breadcrumb-current {
    color: var(--brand-v3-navy);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 360px;
    text-transform: none;
    letter-spacing: normal;
    font-weight: 700;
    font-family: var(--brand-v3-sans);
    font-size: 13px;
}

/* ------------------------------------------
   2. HERO（列表頁）
   ------------------------------------------ */
.blog-hero {
    position: relative;
    padding: 64px 24px 56px;
    text-align: center;
    overflow: hidden;
    background: var(--brand-v3-cream);
    border-bottom: 2.5px solid var(--brand-v3-navy);
}

.blog-hero-bg-blob {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    opacity: 0.45;
    z-index: 0;
}

.blog-hero-bg-blob.orange {
    width: 420px;
    height: 420px;
    background: radial-gradient(circle, var(--brand-v3-orange-soft) 0%, transparent 65%);
    top: -100px;
    right: -60px;
}

.blog-hero-bg-blob.yellow {
    width: 320px;
    height: 320px;
    background: radial-gradient(circle, var(--brand-v3-butter) 0%, transparent 65%);
    bottom: -60px;
    left: -40px;
}

.blog-hero-inner {
    position: relative;
    z-index: 1;
    max-width: 780px;
    margin: 0 auto;
}

.blog-hero-inner .blog-breadcrumb {
    justify-content: center;
    padding-top: 0;
    margin-bottom: 16px;
}

.blog-hero-title {
    font-family: var(--brand-v3-display);
    font-size: clamp(34px, 5vw, 62px);
    font-weight: 800;
    color: var(--brand-v3-navy);
    margin: 0 0 18px;
    line-height: 1.03;
    letter-spacing: -0.035em;
    font-variation-settings: "opsz" 72, "wdth" 92;
}

.blog-hero-subtitle {
    font-family: var(--brand-v3-sans);
    font-size: clamp(16px, 1.8vw, 18px);
    font-weight: 500;
    color: var(--brand-v3-ink-soft);
    margin: 0 auto;
    max-width: 640px;
    line-height: 1.6;
}

/* ------------------------------------------
   3. FILTER TABS（Tag pill）
   ------------------------------------------ */
.blog-filter {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 32px 24px 8px;
    max-width: 1160px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.blog-filter-btn {
    font-family: var(--brand-v3-mono);
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 8px 16px;
    border-radius: 999px;
    border: 2px solid var(--brand-v3-navy);
    background: var(--brand-v3-paper);
    color: var(--brand-v3-navy);
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    white-space: nowrap;
    box-shadow: var(--brand-v3-shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.blog-filter-btn:hover {
    background: var(--brand-v3-butter);
    transform: translate(-1px, -1px);
    box-shadow: var(--brand-v3-shadow-md);
}

.blog-filter-btn.active {
    background: var(--brand-v3-navy);
    color: var(--brand-v3-cream);
    box-shadow: var(--brand-v3-shadow-primary-md);
}

.blog-filter-btn.active:hover {
    background: var(--brand-v3-navy-2);
    box-shadow: var(--brand-v3-shadow-primary-lg);
}

/* ------------------------------------------
   4. ARTICLE CARD GRID (列表頁)
   ------------------------------------------ */
.blog-grid-section {
    padding: 40px 24px 72px;
    max-width: 1160px;
    margin: 0 auto;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    /* 留空間避免 rotate 卡片被裁 */
    padding: 6px 2px 10px;
}

/* Featured post — 左大卡佔 2 cols 2 rows（閱讀優先，不 rotate） */
.blog-card.featured {
    grid-column: 1 / 3;
    grid-row: 1 / 3;
}

/* Sub-featured — 右側高卡（微 rotate） */
.blog-card.sub-featured {
    grid-column: 3 / 4;
    grid-row: 1 / 3;
}

.blog-card {
    background: var(--brand-v3-paper);
    border: 2.5px solid var(--brand-v3-navy);
    border-radius: 18px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    cursor: pointer;
    text-decoration: none;
    color: var(--brand-v3-ink-soft);
    box-shadow: var(--brand-v3-shadow-md);
    transition: transform 0.3s cubic-bezier(.2,.8,.2,1), box-shadow 0.3s ease;
    will-change: transform;
}

/* 一般卡片交錯微 rotate（不含 featured）*/
.blog-card:not(.featured):nth-child(odd) {
    transform: rotate(-0.6deg);
}

.blog-card:not(.featured):nth-child(even) {
    transform: rotate(0.6deg);
}

.blog-card:hover {
    transform: rotate(0) translate(-3px, -3px);
    box-shadow: var(--brand-v3-shadow-lg);
}

/* Card Cover */
.blog-card-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--brand-v3-butter);
    border-bottom: 2.5px solid var(--brand-v3-navy);
    overflow: hidden;
}

.blog-card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.35s ease;
}

.blog-card:hover .blog-card-cover img {
    transform: scale(1.04);
}

.blog-card-cover-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-v3-cream-2);
    color: var(--brand-v3-navy);
    opacity: 0.55;
}

.blog-card-cover-placeholder svg {
    width: 52px;
    height: 52px;
}

/* Tag badge（cover 左上角 pill） */
.blog-card-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    font-family: var(--brand-v3-mono);
    font-size: 10.5px;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 999px;
    background: var(--brand-v3-navy);
    color: var(--brand-v3-cream);
    border: 2px solid var(--brand-v3-cream);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    box-shadow: var(--brand-v3-shadow-sm);
}

/* Card Body */
.blog-card-body {
    padding: 22px 22px 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 10px;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--brand-v3-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--brand-v3-muted);
}

.blog-card-meta-dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--brand-v3-navy);
    opacity: 0.4;
}

.blog-card-title {
    font-family: var(--brand-v3-display);
    font-size: 19px;
    font-weight: 700;
    color: var(--brand-v3-navy);
    line-height: 1.2;
    margin: 0;
    letter-spacing: -0.015em;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card.featured .blog-card-title {
    font-size: 28px;
    -webkit-line-clamp: 3;
    line-height: 1.12;
}

.blog-card.sub-featured .blog-card-title {
    font-size: 22px;
    -webkit-line-clamp: 3;
}

.blog-card-excerpt {
    font-family: var(--brand-v3-sans);
    font-size: 14.5px;
    color: var(--brand-v3-ink-soft);
    line-height: 1.62;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.blog-card.featured .blog-card-excerpt {
    font-size: 15.5px;
    -webkit-line-clamp: 4;
}

.blog-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 14px;
    border-top: 1.5px dashed var(--brand-v3-navy);
    margin-top: auto;
    opacity: 1;
}

.blog-card-author {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--brand-v3-sans);
    font-size: 12.5px;
    font-weight: 600;
    color: var(--brand-v3-ink-soft);
}

.blog-card-author-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--brand-v3-navy);
    background: var(--brand-v3-butter);
}

.blog-card-readmore {
    font-family: var(--brand-v3-mono);
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--brand-v3-orange);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.2s ease, color 0.2s ease;
}

.blog-card:hover .blog-card-readmore {
    gap: 10px;
    color: var(--brand-v3-orange-deep);
}

.blog-card-readmore svg {
    width: 14px;
    height: 14px;
}

/* ------------------------------------------
   5. BLOG POST PAGE
   ------------------------------------------ */
.blog-post-layout {
    display: grid;
    grid-template-columns: 1fr minmax(0, 740px) 1fr;
    gap: 0 40px;
    padding: 40px 24px 0;
    max-width: 1240px;
    margin: 0 auto;
}

/* Breadcrumb bar — sticky 貼在 navbar 下方（nav 自身 sticky top:0，此處接續）
   top 值須對應 nav 實際高度，避免 scroll 後跟 nav 重疊 */
.blog-post-breadcrumb-bar {
    position: sticky;
    top: 85px;          /* desktop nav 高度 ~85px */
    z-index: 90;
    background: rgba(253, 251, 245, 0.92);
    backdrop-filter: saturate(1.4) blur(12px);
    -webkit-backdrop-filter: saturate(1.4) blur(12px);
    padding: 0 24px;
}

.blog-post-breadcrumb-bar .blog-breadcrumb {
    max-width: 1240px;
    margin: 0 auto;
    padding: 12px 0;
}

/* Post Header */
.blog-post-header {
    grid-column: 2;
    padding: 28px 0 36px;
    border-bottom: 2px solid var(--brand-v3-navy);
    margin-bottom: 40px;
}

.blog-post-tag {
    display: inline-flex;
    align-items: center;
    font-family: var(--brand-v3-mono);
    font-size: 11px;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 999px;
    background: var(--brand-v3-butter);
    color: var(--brand-v3-navy);
    border: 2px solid var(--brand-v3-navy);
    margin-bottom: 22px;
    text-decoration: none;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    box-shadow: var(--brand-v3-shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.blog-post-tag:hover {
    background: var(--brand-v3-orange);
    color: var(--brand-v3-paper);
    transform: translate(-1px, -1px);
    box-shadow: var(--brand-v3-shadow-md);
}

.blog-post-title {
    font-family: var(--brand-v3-display);
    font-size: clamp(28px, 4vw, 46px);
    font-weight: 800;
    color: var(--brand-v3-navy);
    line-height: 1.08;
    margin: 0 0 22px;
    letter-spacing: -0.03em;
    font-variation-settings: "opsz" 72, "wdth" 92;
}

.blog-post-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    font-family: var(--brand-v3-sans);
    font-size: 14px;
    color: var(--brand-v3-ink-soft);
    flex-wrap: wrap;
}

.blog-post-meta time,
.blog-post-meta > span:not(.blog-post-meta-sep):not(.blog-post-meta-author) {
    font-family: var(--brand-v3-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--brand-v3-muted);
}

.blog-post-meta-author {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--brand-v3-navy);
}

.blog-post-meta-author-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--brand-v3-navy);
    background: var(--brand-v3-butter);
}

.blog-post-meta-sep {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--brand-v3-navy);
    opacity: 0.4;
}

/* Cover image */
.blog-post-cover {
    grid-column: 1 / -1;
    max-width: 960px;
    margin: 0 auto 40px;
    border: 2.5px solid var(--brand-v3-navy);
    border-radius: 20px;
    overflow: hidden;
    aspect-ratio: 21 / 9;
    box-shadow: var(--brand-v3-shadow-lg);
}

.blog-post-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* TOC Sidebar */
.blog-post-toc {
    grid-column: 1;
    position: sticky;
    top: 160px;
    align-self: start;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    padding-right: 16px;
}

.blog-post-toc-title {
    font-family: var(--brand-v3-mono);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--brand-v3-muted);
    margin: 0 0 14px;
    padding: 0 14px;
}

.blog-post-toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
    border-left: 2px solid var(--brand-v3-off);
}

.blog-post-toc-list li {
    padding: 6px 0 6px 14px;
    border-left: 3px solid transparent;
    margin-left: -2px;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.blog-post-toc-list li.active {
    border-left-color: var(--brand-v3-orange);
    background: var(--brand-v3-butter);
}

.blog-post-toc-list a {
    font-family: var(--brand-v3-sans);
    font-size: 13px;
    font-weight: 500;
    color: var(--brand-v3-muted);
    text-decoration: none;
    line-height: 1.4;
    display: block;
    transition: color 0.2s ease;
}

.blog-post-toc-list li.active a,
.blog-post-toc-list a:hover {
    color: var(--brand-v3-navy);
    font-weight: 700;
}

.blog-post-toc-list li.toc-h3 {
    padding-left: 26px;
    font-size: 12px;
}

/* ---- Article Body（Markdown typography）---- */
.blog-post-body {
    grid-column: 2;
    font-family: var(--brand-v3-sans);
    font-size: 16.5px;
    color: var(--brand-v3-ink-soft);
    line-height: 1.8;
}

.blog-post-body h2 {
    font-family: var(--brand-v3-display);
    font-size: clamp(22px, 2.6vw, 30px);
    font-weight: 800;
    color: var(--brand-v3-navy);
    margin: 56px 0 20px;
    line-height: 1.15;
    letter-spacing: -0.025em;
    scroll-margin-top: 160px;
    padding-top: 28px;
    border-top: 2px solid var(--brand-v3-off);
}

.blog-post-body h2:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.blog-post-body h3 {
    font-family: var(--brand-v3-display);
    font-size: 20px;
    font-weight: 700;
    color: var(--brand-v3-navy);
    margin: 36px 0 14px;
    line-height: 1.25;
    scroll-margin-top: 160px;
    letter-spacing: -0.01em;
}

.blog-post-body h4 {
    font-family: var(--brand-v3-display);
    font-size: 17px;
    font-weight: 700;
    color: var(--brand-v3-navy);
    margin: 28px 0 10px;
    line-height: 1.3;
}

.blog-post-body p {
    margin: 0 0 22px;
}

.blog-post-body strong {
    color: var(--brand-v3-navy);
    font-weight: 700;
}

.blog-post-body a {
    color: var(--brand-v3-orange);
    text-decoration: none;
    border-bottom: 2px solid var(--brand-v3-orange-soft);
    transition: color 0.2s ease, border-color 0.2s ease;
    font-weight: 600;
}

.blog-post-body a:hover {
    color: var(--brand-v3-orange-deep);
    border-bottom-color: var(--brand-v3-orange);
}

.blog-post-body img {
    max-width: 100%;
    border: 2.5px solid var(--brand-v3-navy);
    border-radius: 14px;
    margin: 28px 0;
    box-shadow: var(--brand-v3-shadow-md);
}

.blog-post-body blockquote {
    position: relative;
    border: 2.5px solid var(--brand-v3-navy);
    margin: 28px 0;
    padding: 22px 26px 22px 32px;
    background: var(--brand-v3-butter);
    border-radius: 16px;
    font-family: var(--brand-v3-serif);
    font-style: italic;
    font-size: 17px;
    color: var(--brand-v3-navy);
    font-variation-settings: "opsz" 144;
    font-weight: 500;
    box-shadow: var(--brand-v3-shadow-md);
    line-height: 1.65;
}

.blog-post-body blockquote::before {
    content: "";
    position: absolute;
    left: -2.5px;
    top: -2.5px;
    bottom: -2.5px;
    width: 6px;
    background: var(--brand-v3-orange);
    border-top-left-radius: 14px;
    border-bottom-left-radius: 14px;
}

.blog-post-body blockquote p {
    margin: 0;
}

.blog-post-body blockquote p + p {
    margin-top: 12px;
}

/* Code block */
.blog-post-body pre {
    background: var(--brand-v3-navy-deep);
    color: #D5DAE8;
    padding: 22px 24px;
    border: 2.5px solid var(--brand-v3-navy);
    border-radius: 14px;
    overflow-x: auto;
    font-family: var(--brand-v3-mono);
    font-size: 13.5px;
    line-height: 1.7;
    margin: 28px 0;
    box-shadow: var(--brand-v3-shadow-md);
}

.blog-post-body code {
    font-family: var(--brand-v3-mono);
    font-size: 0.88em;
    font-weight: 500;
}

.blog-post-body :not(pre) > code {
    background: var(--brand-v3-butter);
    color: var(--brand-v3-navy);
    padding: 2px 7px;
    border-radius: 5px;
    border: 1.5px solid var(--brand-v3-navy);
    font-weight: 600;
}

.blog-post-body ul,
.blog-post-body ol {
    padding-left: 28px;
    margin: 18px 0;
}

.blog-post-body li {
    margin-bottom: 10px;
    line-height: 1.7;
}

.blog-post-body ul li::marker,
.blog-post-body ol li::marker {
    color: var(--brand-v3-orange);
    font-weight: 700;
}

.blog-post-body hr {
    border: none;
    border-top: 2px dashed var(--brand-v3-navy);
    opacity: 0.25;
    margin: 44px 0;
}

/* Tables */
.blog-post-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 28px 0;
    font-family: var(--brand-v3-sans);
    font-size: 14.5px;
    line-height: 1.55;
    border: 2.5px solid var(--brand-v3-navy);
    border-radius: 14px;
    overflow: hidden;
    box-shadow: var(--brand-v3-shadow-md);
    background: var(--brand-v3-paper);
    display: table;
}

.blog-post-body thead,
.blog-post-body tbody {
    display: table-row-group;
}

.blog-post-body th {
    background: var(--brand-v3-butter);
    font-family: var(--brand-v3-mono);
    font-weight: 700;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--brand-v3-navy);
    text-align: left;
    padding: 12px 16px;
    border-bottom: 2px solid var(--brand-v3-navy);
    white-space: nowrap;
}

.blog-post-body td {
    padding: 12px 16px;
    border-bottom: 1.5px solid var(--brand-v3-off);
    color: var(--brand-v3-ink-soft);
    vertical-align: top;
}

.blog-post-body tbody tr:last-child td {
    border-bottom: none;
}

.blog-post-body tbody tr:hover {
    background: var(--brand-v3-cream);
}

/* Share Sidebar */
.blog-post-share {
    grid-column: 3;
    position: sticky;
    top: 160px;
    align-self: start;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-left: 16px;
}

.blog-post-share-title {
    font-family: var(--brand-v3-mono);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--brand-v3-muted);
    margin: 0 0 6px;
}

.blog-post-share-btn {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 2px solid var(--brand-v3-navy);
    background: var(--brand-v3-paper);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--brand-v3-navy);
    box-shadow: var(--brand-v3-shadow-sm);
    transition: transform 0.2s cubic-bezier(.2,.8,.2,1), box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
    text-decoration: none;
}

.blog-post-share-btn:hover {
    background: var(--brand-v3-orange);
    color: var(--brand-v3-paper);
    border-color: var(--brand-v3-navy);
    transform: translate(-2px, -2px);
    box-shadow: var(--brand-v3-shadow-md);
}

.blog-post-share-btn svg {
    width: 18px;
    height: 18px;
}

/* Post Tags 底部 */
.blog-post-tags {
    grid-column: 2;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    padding: 32px 0;
    border-top: 2px solid var(--brand-v3-navy);
    margin-top: 56px;
}

.blog-post-tags-label {
    font-family: var(--brand-v3-mono);
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--brand-v3-muted);
}

.blog-post-tags a {
    font-family: var(--brand-v3-mono);
    font-size: 11px;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 999px;
    background: var(--brand-v3-butter);
    color: var(--brand-v3-navy);
    border: 2px solid var(--brand-v3-navy);
    text-decoration: none;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.blog-post-tags a:hover {
    background: var(--brand-v3-orange);
    color: var(--brand-v3-paper);
    transform: translate(-1px, -1px);
    box-shadow: var(--brand-v3-shadow-sm);
}

/* ------------------------------------------
   6. RELATED POSTS
   ------------------------------------------ */
.blog-related {
    padding: 56px 24px 72px;
    max-width: 1160px;
    margin: 0 auto;
}

.blog-related-title {
    font-family: var(--brand-v3-display);
    font-size: clamp(26px, 3.2vw, 36px);
    font-weight: 800;
    color: var(--brand-v3-navy);
    text-align: center;
    margin: 0 0 40px;
    letter-spacing: -0.025em;
    line-height: 1.1;
}

.blog-related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
    padding: 6px 2px 10px;
}

/* related 卡片用跟 regular 一樣的樣式（透過 .blog-card） */

/* ------------------------------------------
   7. TAG PAGE Header（已保留舊結構支援）
   ------------------------------------------ */
.blog-tag-header {
    text-align: center;
    padding: 130px 24px 32px;
    background: var(--brand-v3-cream);
    position: relative;
    overflow: hidden;
    border-bottom: 2.5px solid var(--brand-v3-navy);
}

.blog-tag-header-inner {
    position: relative;
    z-index: 1;
}

.blog-tag-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--brand-v3-mono);
    font-size: 11.5px;
    font-weight: 700;
    padding: 8px 18px;
    border-radius: 999px;
    background: var(--brand-v3-butter);
    color: var(--brand-v3-navy);
    border: 2px solid var(--brand-v3-navy);
    margin-bottom: 18px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    box-shadow: var(--brand-v3-shadow-sm);
}

.blog-tag-label svg {
    width: 14px;
    height: 14px;
}

.blog-tag-title {
    font-family: var(--brand-v3-display);
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 800;
    color: var(--brand-v3-navy);
    margin: 0 0 10px;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.blog-tag-count {
    font-family: var(--brand-v3-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--brand-v3-muted);
}

/* ------------------------------------------
   8. PAGINATION
   ------------------------------------------ */
.blog-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    padding: 40px 24px 20px;
    flex-wrap: wrap;
}

.blog-pagination-btn {
    font-family: var(--brand-v3-sans);
    font-size: 14px;
    font-weight: 700;
    padding: 10px 18px;
    border-radius: 12px;
    border: 2px solid var(--brand-v3-navy);
    background: var(--brand-v3-paper);
    color: var(--brand-v3-navy);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    box-shadow: var(--brand-v3-shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.blog-pagination-btn:hover {
    background: var(--brand-v3-butter);
    transform: translate(-1px, -1px);
    box-shadow: var(--brand-v3-shadow-md);
}

.blog-pagination-btn.disabled {
    opacity: 0.35;
    pointer-events: none;
    box-shadow: none;
}

.blog-pagination-btn svg {
    width: 16px;
    height: 16px;
}

.blog-pagination-pages {
    display: flex;
    align-items: center;
    gap: 4px;
}

.blog-pagination-page {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: 2px solid transparent;
    background: transparent;
    color: var(--brand-v3-ink-soft);
    font-family: var(--brand-v3-mono);
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.blog-pagination-page:hover {
    background: var(--brand-v3-butter);
    color: var(--brand-v3-navy);
    border-color: var(--brand-v3-navy);
}

.blog-pagination-page.active {
    background: var(--brand-v3-navy);
    color: var(--brand-v3-cream);
    border-color: var(--brand-v3-navy);
    box-shadow: var(--brand-v3-shadow-sm);
}

/* ------------------------------------------
   9. CTA SECTION（深 navy 底）
   ------------------------------------------ */
.blog-cta {
    background: var(--brand-v3-navy);
    padding: 88px 24px;
    text-align: center;
    position: relative;
    overflow: hidden;
    border-top: 2.5px solid var(--brand-v3-navy);
}

.blog-cta::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 640px;
    height: 640px;
    background: radial-gradient(circle, var(--brand-v3-orange-deep) 0%, transparent 55%);
    opacity: 0.22;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.blog-cta-inner {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
}

.blog-cta-title {
    font-family: var(--brand-v3-display);
    font-size: clamp(26px, 3.8vw, 38px);
    font-weight: 800;
    color: var(--brand-v3-cream);
    margin: 0 0 14px;
    line-height: 1.1;
    letter-spacing: -0.025em;
    font-variation-settings: "opsz" 72, "wdth" 92;
}

.blog-cta-subtitle {
    font-family: var(--brand-v3-sans);
    font-size: 15.5px;
    font-weight: 500;
    color: var(--brand-v3-cream);
    opacity: 0.82;
    margin: 0 0 30px;
    line-height: 1.6;
}

.blog-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    background: var(--brand-v3-orange);
    color: var(--brand-v3-paper);
    border: 2.5px solid var(--brand-v3-paper);
    border-radius: 999px;
    font-family: var(--brand-v3-sans);
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    box-shadow: 5px 5px 0 var(--brand-v3-orange-deep);
    transition: transform 0.25s cubic-bezier(.2,.8,.2,1), box-shadow 0.25s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    letter-spacing: -0.005em;
}

.blog-cta-btn:hover {
    background: var(--brand-v3-paper);
    color: var(--brand-v3-navy);
    border-color: var(--brand-v3-navy);
    transform: translate(-2px, -2px);
    box-shadow: 7px 7px 0 var(--brand-v3-cream);
}

/* ------------------------------------------
   10. EMPTY STATE
   ------------------------------------------ */
.blog-empty {
    text-align: center;
    padding: 96px 24px;
    max-width: 560px;
    margin: 0 auto;
}

.blog-empty-icon {
    width: 64px;
    height: 64px;
    color: var(--brand-v3-navy);
    opacity: 0.35;
    margin-bottom: 24px;
}

.blog-empty-title {
    font-family: var(--brand-v3-display);
    font-size: clamp(22px, 3vw, 28px);
    font-weight: 800;
    color: var(--brand-v3-navy);
    margin: 0 0 10px;
    letter-spacing: -0.02em;
}

.blog-empty-desc {
    font-family: var(--brand-v3-sans);
    font-size: 15px;
    color: var(--brand-v3-ink-soft);
    margin: 0 0 28px;
    line-height: 1.6;
}

.blog-empty-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--brand-v3-sans);
    font-size: 14px;
    font-weight: 700;
    color: var(--brand-v3-orange);
    text-decoration: none;
    border-bottom: 2px solid var(--brand-v3-orange-soft);
    padding-bottom: 2px;
    transition: gap 0.2s ease, border-color 0.2s ease;
}

.blog-empty-back:hover {
    gap: 12px;
    border-bottom-color: var(--brand-v3-orange);
}

.blog-empty-back svg {
    width: 16px;
    height: 16px;
}

/* ------------------------------------------
   11. READING PROGRESS BAR
   ------------------------------------------ */
.blog-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: var(--brand-v3-orange);
    z-index: 9999;
    transition: width 80ms linear;
}

/* ------------------------------------------
   12. MOBILE TOC SHEET（post 頁）
   ------------------------------------------ */
.blog-mobile-toc-btn {
    display: none;
    position: fixed;
    bottom: 26px;
    right: 26px;
    width: 52px;
    height: 52px;
    border-radius: 14px;
    border: 2.5px solid var(--brand-v3-navy);
    background: var(--brand-v3-orange);
    color: var(--brand-v3-paper);
    box-shadow: var(--brand-v3-shadow-md);
    z-index: 100;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.blog-mobile-toc-btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: var(--brand-v3-shadow-lg);
}

.blog-mobile-toc-btn svg {
    width: 22px;
    height: 22px;
}

.blog-mobile-toc-sheet {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 65vh;
    background: var(--brand-v3-cream);
    border-top: 2.5px solid var(--brand-v3-navy);
    border-radius: 24px 24px 0 0;
    box-shadow: 0 -8px 0 var(--brand-v3-navy);
    z-index: 200;
    overflow-y: auto;
    padding: 24px 22px 32px;
    transform: translateY(100%);
    /* box-shadow Y:-8px 是向上偏移的硬陰影，transform: translateY(100%) 帶不走
       它的視覺位置，會在 viewport 底部殘留一條 navy 實心線。
       用 visibility 確保 close 後整個元素（含 shadow）完全不可見；
       transition 加 delay 等動畫結束才 hidden，不打斷滑出動畫。 */
    visibility: hidden;
    transition: transform 0.3s cubic-bezier(.2,.8,.2,1),
                visibility 0s linear 0.3s;
}

.blog-mobile-toc-sheet.open {
    transform: translateY(0);
    visibility: visible;
    transition: transform 0.3s cubic-bezier(.2,.8,.2,1),
                visibility 0s linear 0s;
}

.blog-mobile-toc-sheet-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--brand-v3-navy);
}

.blog-mobile-toc-sheet-title {
    font-family: var(--brand-v3-display);
    font-size: 16px;
    font-weight: 800;
    color: var(--brand-v3-navy);
    letter-spacing: -0.01em;
}

.blog-mobile-toc-close {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    border: 2px solid var(--brand-v3-navy);
    background: var(--brand-v3-paper);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--brand-v3-navy);
    box-shadow: var(--brand-v3-shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.blog-mobile-toc-close:hover {
    transform: translate(-1px, -1px);
    box-shadow: var(--brand-v3-shadow-md);
}

.blog-mobile-toc-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(21, 33, 58, 0.45);
    backdrop-filter: blur(4px);
    z-index: 199;
}

/* =================================================================
   RWD 斷點系統（對齊 v3 skill §17）
   ≤1080: TOC/Share 隱藏、Grid 2 cols、post layout 單欄
   ≤820:  hero padding/title 縮、filter 小間距、card 單欄
   ≤640:  hero 再縮、featured card title 小、meta 包行
   ================================================================= */

@media (max-width: 1080px) {
    .blog-post-layout {
        grid-template-columns: 1fr;
        padding-top: 32px;
    }

    .blog-post-toc,
    .blog-post-share {
        display: none;
    }

    .blog-post-header,
    .blog-post-body,
    .blog-post-tags {
        grid-column: 1;
    }

    .blog-post-cover {
        grid-column: 1;
        max-width: 100%;
    }

    .blog-mobile-toc-btn {
        display: flex;
    }

    .blog-mobile-toc-sheet {
        display: block;
    }

    /* 列表頁 2 cols，featured/sub-featured 恢復全寬 */
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 26px;
    }

    .blog-card.featured,
    .blog-card.sub-featured {
        grid-column: 1 / -1;
        grid-row: auto;
    }

    .blog-card.featured .blog-card-title {
        font-size: 24px;
    }

    .blog-related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 820px) {
    .blog-hero {
        padding: 48px 20px 44px;
    }

    .blog-hero-title {
        font-size: clamp(28px, 6vw, 42px);
    }

    .blog-hero-subtitle {
        font-size: 15.5px;
    }

    .blog-filter {
        padding: 24px 18px 4px;
        gap: 6px;
    }

    .blog-filter-btn {
        font-size: 10.5px;
        padding: 6px 12px;
    }

    .blog-grid-section {
        padding: 32px 20px 60px;
    }

    /* 手機端取消 sticky：避免與 nav 高度誤差造成文字被切，且讓出寶貴的螢幕空間
       （導航靠浮動 TOC 按鈕即可，breadcrumb 不需常駐） */
    .blog-post-breadcrumb-bar {
        position: static;
        background: transparent;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        padding: 0 18px;
    }

    .blog-post-breadcrumb-bar .blog-breadcrumb {
        padding: 18px 0 6px;
        font-size: 11px;
    }

    /* 手機端隱藏第三層（文章標題）+ 對應的分隔符：
       原因：current 強制 max-width 360px，加上前段約 100px 會超出 mobile viewport，
       被 body overflow 裁掉變成「右側被切」；且 H1 已顯示同樣標題，breadcrumb
       只保留「首頁 > 部落格」更乾淨。 */
    .blog-post-breadcrumb-bar .blog-breadcrumb-current,
    .blog-post-breadcrumb-bar .blog-breadcrumb-sep:last-of-type {
        display: none;
    }

    .blog-post-title {
        font-size: clamp(24px, 5.5vw, 34px);
    }

    .blog-post-body {
        font-size: 15.5px;
    }

    .blog-post-body h2 {
        font-size: clamp(20px, 4.5vw, 26px);
        margin: 44px 0 16px;
        padding-top: 22px;
    }

    .blog-post-body h3 {
        font-size: 18px;
        margin: 30px 0 12px;
    }

    .blog-post-body blockquote {
        padding: 18px 20px 18px 26px;
        font-size: 15.5px;
    }

    .blog-post-body pre {
        padding: 18px 20px;
        font-size: 12.5px;
    }

    .blog-post-body table {
        font-size: 13px;
    }

    .blog-post-body th,
    .blog-post-body td {
        padding: 10px 12px;
    }

    .blog-related {
        padding: 40px 20px 56px;
    }

    .blog-related-grid {
        gap: 22px;
    }

    .blog-cta {
        padding: 64px 20px;
    }

    .blog-hero-bg-blob.orange {
        width: 320px;
        height: 320px;
        opacity: 0.32;
    }

    .blog-hero-bg-blob.yellow {
        width: 240px;
        height: 240px;
        opacity: 0.32;
    }
}

@media (max-width: 640px) {
    .blog-hero {
        padding: 40px 18px 40px;
    }

    .blog-hero-title {
        font-size: clamp(24px, 7.5vw, 32px);
        letter-spacing: -0.025em;
    }

    .blog-grid {
        grid-template-columns: 1fr;
        gap: 22px;
    }

    .blog-card.featured .blog-card-title {
        font-size: 21px;
    }

    .blog-card.sub-featured .blog-card-title {
        font-size: 19px;
    }

    .blog-card-body {
        padding: 18px;
    }

    .blog-related-grid {
        grid-template-columns: 1fr;
    }

    .blog-post-layout {
        padding: 28px 18px 0;
    }

    .blog-post-title {
        font-size: 24px;
    }

    .blog-post-meta {
        gap: 10px;
        font-size: 13px;
    }

    .blog-post-meta time,
    .blog-post-meta > span:not(.blog-post-meta-sep):not(.blog-post-meta-author) {
        font-size: 11px;
    }

    .blog-pagination {
        gap: 6px;
    }

    .blog-pagination-btn {
        padding: 8px 14px;
        font-size: 13px;
    }

    .blog-pagination-page {
        width: 34px;
        height: 34px;
        font-size: 12.5px;
    }

    .blog-cta {
        padding: 56px 18px;
    }

    .blog-cta-btn {
        padding: 13px 28px;
        font-size: 14px;
    }

    .blog-mobile-toc-btn {
        bottom: 20px;
        right: 20px;
        width: 48px;
        height: 48px;
    }
}

/* =================================================================
   13. 滾動進場動畫（v3 skill §18）
        用 CSS 3 translate 保留卡片 rotate
   ================================================================= */

/* 覆蓋 landing.css 的 global .animate-on-scroll（transform: translateY(40px)）
   用 CSS 3 translate 屬性做進場動畫，不碰 transform，保留卡片 rotate
   blog JS 加 .visible class（非 .in-view），兩者都支援 */
.blog-card.animate-on-scroll,
.blog-cta-inner.animate-on-scroll {
    opacity: 0;
    transform: none;          /* 重設 landing 的 translateY(40px) */
    translate: 0 24px;        /* CSS 3 translate 不影響卡片 rotate */
    transition: opacity 0.6s cubic-bezier(.2,.8,.2,1),
                translate 0.6s cubic-bezier(.2,.8,.2,1);
}

.blog-card.animate-on-scroll.visible,
.blog-card.animate-on-scroll.in-view,
.blog-cta-inner.animate-on-scroll.visible,
.blog-cta-inner.animate-on-scroll.in-view {
    opacity: 1;
    translate: 0 0;
}

/* Featured / Sub-featured：第一眼內容，直接顯示不等進場 */
.blog-card.featured.animate-on-scroll,
.blog-card.sub-featured.animate-on-scroll {
    opacity: 1;
    translate: 0 0;
    transition: none;
}

/* Staggered card delay */
.blog-card:nth-child(1).animate-on-scroll { transition-delay: 0s; }
.blog-card:nth-child(2).animate-on-scroll { transition-delay: 0.08s; }
.blog-card:nth-child(3).animate-on-scroll { transition-delay: 0.16s; }
.blog-card:nth-child(4).animate-on-scroll { transition-delay: 0.24s; }
.blog-card:nth-child(5).animate-on-scroll { transition-delay: 0.32s; }
.blog-card:nth-child(6).animate-on-scroll { transition-delay: 0.40s; }

/* =================================================================
   14. REDUCED MOTION
   ================================================================= */
@media (prefers-reduced-motion: reduce) {
    .blog-card,
    .blog-cta-btn,
    .blog-post-share-btn,
    .blog-pagination-btn,
    .blog-card-cover img {
        transition-duration: 0.01ms !important;
    }

    .blog-card.animate-on-scroll,
    .blog-cta-inner.animate-on-scroll {
        opacity: 1 !important;
        translate: 0 0 !important;
        transition: none !important;
    }

    .blog-card:not(.featured) {
        transform: none !important;
    }

    .blog-progress-bar {
        transition: none;
    }
}