/*
 * LitMemo Blog — Standalone CSS
 * Matches the landing page aesthetic: parchment tones, gold accents, serif headings.
 * Self-contained — no Tailwind dependency.
 */

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --blog-bg: #faf6f0;
    --blog-text: #2c2418;
    --blog-text-muted: #7a6e5e;
    --blog-primary: #8b6f47;
    --blog-primary-light: #c4a574;
    --blog-border: #e8dfd4;
    --blog-card-bg: #ffffff;
    --blog-code-bg: #f5f0e8;
    --blog-font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
    --blog-font-serif: Georgia, "Noto Serif TC", "PingFang TC", serif;
    --blog-max-width: 1100px;
    --blog-narrow-width: 760px;
}

/*
 * Swei Spring Sugar — loaded lazily on user interaction to preserve
 * Core Web Vitals for SEO crawlers. The .fonts-loaded class is added
 * by the inline <script> in the HTML templates after first interaction.
 * html.fonts-loaded has higher specificity (0,1,1) than :root (0,1,0).
 */
html.fonts-loaded {
    --blog-font: "Swei Spring Sugar", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
    --blog-font-serif: "Swei Spring Sugar", Georgia, "Noto Serif TC", "PingFang TC", serif;
}

html { font-size: 16px; }
body {
    font-family: var(--blog-font);
    background: var(--blog-bg);
    color: var(--blog-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--blog-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Layout ---- */
.blog-layout {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.blog-container {
    max-width: var(--blog-max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.blog-container-narrow {
    max-width: var(--blog-narrow-width);
}

.blog-main { flex: 1; padding: 2.5rem 0 4rem; }

/* ---- Header ---- */
.blog-header {
    border-bottom: 1px solid var(--blog-border);
    background: rgba(255,255,255,0.8);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.blog-header .blog-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 3.5rem;
}

.blog-logo {
    font-family: var(--blog-font-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--blog-primary);
    letter-spacing: 0.02em;
}
.blog-logo {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}
.blog-logo:hover { text-decoration: none; opacity: 0.85; }

.blog-logo-img {
    height: 1.5rem;
    width: auto;
}

.blog-nav { display: flex; gap: 1.25rem; align-items: center; }

.blog-nav-link {
    font-size: 0.875rem;
    color: var(--blog-text-muted);
    transition: color 0.15s;
}
.blog-nav-link:hover,
.blog-nav-link.active { color: var(--blog-primary); text-decoration: none; }

.blog-nav-cta {
    background: var(--blog-primary);
    color: #fff !important;
    padding: 0.375rem 1rem;
    border-radius: 0.375rem;
    font-weight: 500;
}
.blog-nav-cta:hover { background: #7a6040; text-decoration: none; }

/* ---- Hamburger button (hidden on desktop) ---- */
.blog-hamburger {
    display: none;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--blog-text-muted);
}
.blog-hamburger:hover { color: var(--blog-primary); }
.blog-hamburger svg { width: 1.375rem; height: 1.375rem; }

/* ---- Mobile dropdown menu ---- */
.blog-mobile-menu {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.75rem 1rem 1rem;
    border-top: 1px solid var(--blog-border);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(8px);
}
.blog-mobile-menu a {
    display: block;
    padding: 0.5rem 0;
    font-size: 0.875rem;
    color: var(--blog-text-muted);
    text-decoration: none;
}
.blog-mobile-menu a:hover,
.blog-mobile-menu a.active { color: var(--blog-primary); }
.blog-mobile-menu .blog-nav-cta {
    display: block;
    text-align: center;
    margin-top: 0.375rem;
    color: #fff !important;
}

/* ---- Blog List ---- */
.blog-list-title {
    font-family: var(--blog-font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--blog-primary);
    margin-bottom: 0.5rem;
}

.blog-list-subtitle {
    color: var(--blog-text-muted);
    font-size: 1rem;
    margin-bottom: 2.5rem;
}

/* ---- Topic cluster sections ---- */
.blog-cluster-section { margin-bottom: 4rem; }
.blog-cluster-section:last-of-type { margin-bottom: 1rem; }

.blog-cluster-title {
    font-family: var(--blog-font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--blog-text);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.blog-cluster-emoji {
    font-size: 1.5rem;
    line-height: 1;
}

.blog-cluster-desc {
    color: var(--blog-text-muted);
    font-size: 0.9375rem;
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.blog-post-list { display: flex; flex-direction: column; gap: 1rem; }

.blog-card {
    background: var(--blog-card-bg);
    border: 1px solid var(--blog-border);
    border-radius: 0.75rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.blog-card:hover {
    border-color: var(--blog-primary-light);
    box-shadow: 0 2px 12px rgba(139,111,71,0.08);
}

.blog-card-link { display: block; text-decoration: none !important; color: inherit; }

.blog-card-body { padding: 1.5rem; }

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.8125rem;
    color: var(--blog-text-muted);
    margin-bottom: 0.5rem;
}

.blog-card-tags { display: flex; gap: 0.375rem; flex-wrap: wrap; }

.blog-tag {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    font-size: 0.75rem;
    border-radius: 999px;
    background: rgba(139,111,71,0.08);
    color: var(--blog-primary);
}

.blog-card-title {
    font-family: var(--blog-font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--blog-text);
    line-height: 1.4;
    margin-bottom: 0.375rem;
}

.blog-card-desc {
    font-size: 0.9375rem;
    color: var(--blog-text-muted);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ---- Empty State ---- */
.blog-empty {
    text-align: center;
    padding: 4rem 0;
    color: var(--blog-text-muted);
    font-size: 1.125rem;
}

/* ---- Pagination ---- */
.blog-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 3rem;
    font-size: 0.9375rem;
}

.blog-page-link {
    color: var(--blog-primary);
    font-weight: 500;
}

.blog-page-info { color: var(--blog-text-muted); }

/* ---- Single Article ---- */
.blog-breadcrumb {
    font-size: 0.8125rem;
    color: var(--blog-text-muted);
    margin-bottom: 2rem;
}
.blog-breadcrumb a { color: var(--blog-primary); }
.blog-breadcrumb-sep { margin: 0 0.5rem; }

.blog-article-header { margin-bottom: 2.5rem; }

.blog-article-title {
    font-family: var(--blog-font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--blog-text);
    line-height: 1.35;
    margin-bottom: 0.75rem;
}

.blog-article-meta {
    font-size: 0.875rem;
    color: var(--blog-text-muted);
    margin-bottom: 0.75rem;
}

.blog-article-tags { display: flex; gap: 0.375rem; flex-wrap: wrap; }

/* ---- Markdown Content ---- */
.blog-content {
    font-size: 1.0625rem;
    line-height: 1.85;
    color: var(--blog-text);
}

.blog-content h1,
.blog-content h2,
.blog-content h3,
.blog-content h4,
.blog-content h5,
.blog-content h6 {
    font-family: var(--blog-font-serif);
    font-weight: 600;
    color: var(--blog-text);
    margin-top: 2em;
    margin-bottom: 0.75em;
    line-height: 1.3;
}

.blog-content h1 { font-size: 1.75rem; }
.blog-content h2 { font-size: 1.5rem; border-bottom: 1px solid var(--blog-border); padding-bottom: 0.3em; }
.blog-content h3 { font-size: 1.25rem; }
.blog-content h4 { font-size: 1.125rem; }

.blog-content p { margin-bottom: 1.25em; }

.blog-content a {
    color: var(--blog-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.blog-content strong { font-weight: 600; }

.blog-content blockquote {
    border-left: 3px solid var(--blog-primary-light);
    padding: 0.75em 1.25em;
    margin: 1.5em 0;
    background: rgba(139,111,71,0.04);
    color: var(--blog-text-muted);
    border-radius: 0 0.375rem 0.375rem 0;
}
.blog-content blockquote p:last-child { margin-bottom: 0; }

.blog-content ul,
.blog-content ol {
    padding-left: 1.5em;
    margin-bottom: 1.25em;
}
.blog-content li { margin-bottom: 0.3em; }

.blog-content code {
    font-family: "SF Mono", "Fira Code", "Consolas", monospace;
    font-size: 0.875em;
    background: var(--blog-code-bg);
    padding: 0.15em 0.4em;
    border-radius: 0.25rem;
}

.blog-content pre {
    background: #1e1e1e;
    color: #d4d4d4;
    border-radius: 0.5rem;
    padding: 1.25rem;
    overflow-x: auto;
    margin: 1.5em 0;
    font-size: 0.875rem;
    line-height: 1.6;
}
.blog-content pre code {
    background: none;
    padding: 0;
    font-size: inherit;
    color: inherit;
}

/* Wrap tables in a horizontal scroll container on mobile */
.blog-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5em 0;
    font-size: 0.9375rem;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.blog-content th,
.blog-content td {
    border: 1px solid var(--blog-border);
    padding: 0.625rem 0.875rem;
    text-align: left;
    white-space: nowrap;
}
.blog-content th {
    background: var(--blog-code-bg);
    font-weight: 600;
}

.blog-content img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
    margin: 1.5em 0;
}

.blog-content hr {
    border: none;
    border-top: 1px solid var(--blog-border);
    margin: 2em 0;
}

/* ---- Related Posts ---- */
/* ---- FAQ ---- */
.blog-faq {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--blog-border);
}
.blog-faq-title {
    font-family: var(--blog-font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--blog-text);
    margin-bottom: 1.25rem;
}
.blog-faq-item {
    border: 1px solid var(--blog-border);
    border-radius: 0.75rem;
    background: var(--blog-card-bg);
    margin-bottom: 0.75rem;
    overflow: hidden;
}
.blog-faq-question {
    font-family: var(--blog-font-serif);
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--blog-text);
    padding: 1rem 1.25rem;
    cursor: pointer;
    list-style: none;
    position: relative;
    padding-right: 2.75rem;
    transition: color 0.2s;
}
.blog-faq-question:hover { color: var(--blog-primary); }
/* Hide the default disclosure triangle (incl. Safari/WebKit) and draw our own +/− */
.blog-faq-question::-webkit-details-marker { display: none; }
.blog-faq-question::after {
    content: "+";
    position: absolute;
    right: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.375rem;
    font-weight: 400;
    color: var(--blog-primary-light);
    line-height: 1;
}
.blog-faq-item[open] .blog-faq-question::after { content: "\2212"; } /* minus sign */
.blog-faq-answer {
    padding: 0 1.25rem 1.125rem;
    color: var(--blog-text-muted);
    font-size: 0.9375rem;
    line-height: 1.7;
    white-space: pre-wrap;
}

.blog-related {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--blog-border);
}
.blog-related-title {
    font-family: var(--blog-font-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--blog-text);
    margin-bottom: 1.25rem;
}
.blog-related-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}
@media (min-width: 640px) {
    .blog-related-grid { grid-template-columns: repeat(3, 1fr); }
}
.blog-related-card {
    display: block;
    padding: 1.25rem;
    border: 1px solid var(--blog-border);
    border-radius: 0.75rem;
    background: var(--blog-card-bg);
    text-decoration: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.blog-related-card:hover {
    border-color: var(--blog-primary-light);
    box-shadow: 0 2px 8px rgba(139, 111, 71, 0.1);
}
.blog-related-card-title {
    font-family: var(--blog-font-serif);
    font-size: 1rem;
    font-weight: 700;
    color: var(--blog-text);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}
.blog-related-card-desc {
    font-size: 0.8125rem;
    color: var(--blog-text-muted);
    line-height: 1.5;
    margin-bottom: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.blog-related-card-link {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--blog-primary);
}

/* ---- Related Features (blog → feature internal links) ----
   Reuses .blog-related-* card/grid styles; this block only adds the
   small「功能」eyebrow tag shown above each feature link title. */
.blog-feature-card-tag {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--blog-primary);
    background: var(--blog-card-tag-bg, rgba(125, 99, 64, 0.08));
    border-radius: 0.375rem;
    padding: 0.125rem 0.5rem;
    margin-bottom: 0.625rem;
}

/* ---- Back Link ---- */
.blog-back {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--blog-border);
}

.blog-back-link {
    color: var(--blog-primary);
    font-size: 0.9375rem;
    font-weight: 500;
}

/* ---- Footer ---- */
.blog-footer {
    border-top: 1px solid var(--blog-border);
    padding: 2rem 0;
    text-align: center;
}

.blog-footer-text {
    font-size: 0.875rem;
    color: var(--blog-text-muted);
    margin-bottom: 0.5rem;
}

.blog-footer-logo {
    font-family: var(--blog-font-serif);
    font-weight: 700;
    color: var(--blog-primary);
}
.blog-footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}
.blog-footer-logo:hover { text-decoration: none; }

.blog-footer-logo-img {
    height: 1rem;
    width: auto;
    opacity: 0.5;
}

.blog-footer-links {
    font-size: 0.8125rem;
    color: var(--blog-text-muted);
}
.blog-footer-links a { color: var(--blog-text-muted); }
.blog-footer-links a:hover { color: var(--blog-primary); }

/* ---- Responsive ---- */
@media (max-width: 640px) {
    .blog-container { padding: 0 1rem; }
    .blog-list-title { font-size: 1.5rem; }
    .blog-list-subtitle { font-size: 0.875rem; margin-bottom: 1.5rem; }
    .blog-cluster-section { margin-bottom: 2.5rem; }
    .blog-cluster-title { font-size: 1.25rem; }
    .blog-cluster-desc { font-size: 0.875rem; margin-bottom: 0.875rem; }
    .blog-article-title { font-size: 1.375rem; }
    .blog-card-body { padding: 1rem; }
    .blog-card-title { font-size: 1.1rem; }
    .blog-content { font-size: 1rem; }
    .blog-content h2 { font-size: 1.25rem; }
    .blog-content h3 { font-size: 1.125rem; }
    .blog-content pre { padding: 0.875rem; font-size: 0.8125rem; }
    .blog-content blockquote { padding: 0.5em 0.75em; }
    .blog-content th,
    .blog-content td { padding: 0.5rem 0.625rem; font-size: 0.8125rem; }
    .blog-faq-title { font-size: 1.25rem; }
    .blog-faq-question { font-size: 1rem; padding: 0.875rem 1rem; padding-right: 2.5rem; }
    .blog-faq-answer { padding: 0 1rem 1rem; font-size: 0.875rem; }

    /* Header: hide desktop nav, show hamburger */
    .blog-nav { display: none; }
    .blog-hamburger { display: flex; }
    .blog-mobile-menu.open { display: flex; }
    .blog-nav-cta { font-size: 0.8125rem; padding: 0.3rem 0.75rem; }
    .blog-logo-img { height: 1.25rem; }

    /* Footer compact */
    .blog-footer { padding: 1.5rem 0; }
    .blog-footer-text { font-size: 0.8125rem; }
}