/**
 * Blog (archive + single) styles for Katsumi theme.
 * Uses theme CSS vars (--bg, --ink, --surface, --border, --grad-text, etc.)
 * which are defined in styles.css under :root.
 */

/* ============================================================
   BLOG ARCHIVE
   ============================================================ */

.site-main--blog-archive {
    padding: 0;
}

.blog-archive-header {
    text-align: center;
    max-width: 740px;
    margin: 0 auto clamp(40px, 6vw, 72px);
}

.blog-archive-header .kicker {
    display: inline-block;
    font-size: 0.8125rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin: 0 0 14px;
    padding: 6px 14px;
    background: rgba(37, 99, 235, 0.1);
    color: var(--blue, #2563EB);
    font-weight: 600;
    border-radius: 999px;
}

.blog-archive-title {
    display: block;
    font-size: clamp(2rem, 5vw, 3.25rem);
    line-height: 1.2;
    margin: 0 0 16px;
    padding-bottom: 0.12em;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--ink, #0B0D17);
    background: var(--grad-text, linear-gradient(135deg, #E63946 0%, #2563EB 100%));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.blog-archive-intro {
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--ink-3, #595D6E);
}
.blog-archive-intro p { margin: 0; }

/* Card list — grid that gracefully collapses on mobile */
.blog-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: clamp(20px, 3vw, 32px);
}

.blog-card {
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #ECEDF3);
    border-radius: var(--radius-lg, 22px);
    overflow: hidden;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(15,23,42,0.06));
}
.blog-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-strong, #E1E3EC);
    box-shadow: var(--shadow-md, 0 12px 28px rgba(15,23,42,0.08));
}

.blog-card-thumb {
    display: block;
    aspect-ratio: 16 / 9;
    background: var(--bg-soft, #F4F5F9);
    overflow: hidden;
}
.blog-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
}
.blog-card:hover .blog-card-thumb img { transform: scale(1.04); }

.blog-card-body {
    padding: clamp(20px, 2.5vw, 28px);
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
}

.blog-card-meta {
    font-size: 0.8125rem;
    color: var(--ink-4, #8A8FA3);
    letter-spacing: 0.02em;
}

.blog-card-title {
    font-size: 1.3125rem;
    line-height: 1.3;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.01em;
    color: var(--ink, #0B0D17);
}
.blog-card-title a {
    color: inherit;
    text-decoration: none;
    background-image: linear-gradient(currentColor, currentColor);
    background-size: 0 1px;
    background-repeat: no-repeat;
    background-position: 0 100%;
    transition: background-size 0.25s ease;
}
.blog-card-title a:hover { background-size: 100% 1px; }

.blog-card-excerpt {
    margin: 0;
    color: var(--ink-3, #595D6E);
    line-height: 1.55;
    font-size: 0.9375rem;
    flex: 1;
}

.blog-card-link {
    align-self: flex-start;
    margin-top: 6px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 0.9375rem;
    text-decoration: none;
    background: var(--grad-text, linear-gradient(135deg, #E63946 0%, #2563EB 100%));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: gap 0.2s ease;
}
.blog-card-link:hover { gap: 12px; }
.blog-card-link span { color: var(--blue, #2563EB); -webkit-text-fill-color: var(--blue, #2563EB); }

/* Pagination */
.blog-pagination {
    margin-top: clamp(40px, 6vw, 64px);
}
.blog-pagination .nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}
.blog-pagination a,
.blog-pagination .current {
    padding: 10px 16px;
    border-radius: var(--radius-sm, 10px);
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #ECEDF3);
    text-decoration: none;
    color: var(--ink, #0B0D17);
    font-size: 0.9375rem;
    font-weight: 600;
    transition: background 0.2s ease, border-color 0.2s ease;
}
.blog-pagination a:hover {
    background: var(--bg-soft, #F4F5F9);
    border-color: var(--border-strong, #E1E3EC);
}
.blog-pagination .current {
    background: var(--ink, #0B0D17);
    border-color: var(--ink, #0B0D17);
    color: #fff;
}

/* Empty state */
.blog-empty {
    text-align: center;
    padding: 60px 16px;
    color: var(--ink-4, #8A8FA3);
    font-size: 1.0625rem;
    background: var(--surface, #FFFFFF);
    border: 1px dashed var(--border-strong, #E1E3EC);
    border-radius: var(--radius-lg, 22px);
}

/* ============================================================
   SINGLE BLOG POST
   ============================================================ */

.site-main--single-post {
    padding: 0 0 clamp(40px, 6vw, 80px);
}

.blog-post .container {
    max-width: 920px;
}

.blog-post-header {
    margin-top: clamp(24px, 3vw, 36px); /* spacing from breadcrumbs */
    margin-bottom: clamp(32px, 4vw, 48px);
    text-align: center;
}

.blog-post-header .kicker {
    display: inline-block;
    margin: 0 0 18px;
    padding: 6px 14px;
    font-size: 0.8125rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--blue, #2563EB);
    background: rgba(37, 99, 235, 0.1);
    border-radius: 999px;
}
.blog-post-header .kicker a {
    color: inherit;
    text-decoration: none;
}
.blog-post-header .kicker a:hover { opacity: 0.8; }

.blog-post-title {
    display: block;
    font-size: clamp(1.875rem, 4.5vw, 2.75rem);
    line-height: 1.2;
    margin: 0 0 18px;
    padding-bottom: 0.1em;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--ink, #0B0D17);
    background: var(--grad-text, linear-gradient(135deg, #E63946 0%, #2563EB 100%));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.blog-post-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 0.875rem;
    color: var(--ink-4, #8A8FA3);
}
.blog-post-meta .dot { opacity: 0.5; }

.blog-post-hero {
    margin: clamp(28px, 4vw, 48px) calc(var(--gutter, 28px) * -1) clamp(32px, 4vw, 48px);
    border-radius: 0;
    overflow: hidden;
}
@media (min-width: 920px) {
    .blog-post-hero {
        margin-left: 0;
        margin-right: 0;
        border-radius: var(--radius-lg, 22px);
    }
}
.blog-post-hero img {
    width: 100%;
    height: auto;
    display: block;
}

/* Long-form reading column typography */
.blog-post-content {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--ink-2, #2A2D3A);
}
.blog-post-content > * + * { margin-top: 1.2em; }
.blog-post-content p { margin: 0 0 1.2em; }
.blog-post-content h2 {
    font-size: clamp(1.375rem, 2.5vw, 1.75rem);
    line-height: 1.25;
    margin: 1.2em 0 0.6em;
    letter-spacing: -0.01em;
    font-weight: 700;
    color: var(--ink, #0B0D17);
}
.blog-post-content h3 {
    font-size: 1.25rem;
    line-height: 1.3;
    margin: 1.8em 0 0.4em;
    font-weight: 700;
    color: var(--ink, #0B0D17);
}
.blog-post-content ul,
.blog-post-content ol {
    margin: 0 0 1.2em;
    padding-left: 1.4em;
}
.blog-post-content li { margin: 0.4em 0; }
.blog-post-content li strong { font-weight: 700; color: var(--ink, #0B0D17); }
.blog-post-content a {
    color: var(--blue, #2563EB);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    text-decoration-color: rgba(37, 99, 235, 0.4);
    transition: text-decoration-color 0.2s ease;
    font-weight: 500;
}
.blog-post-content a:hover { text-decoration-color: var(--blue, #2563EB); }
.blog-post-content blockquote {
    margin: 1.5em 0;
    padding: 18px 22px;
    border-left: 3px solid var(--blue, #2563EB);
    background: var(--bg-soft, #F4F5F9);
    border-radius: 0 12px 12px 0;
    font-style: italic;
    color: var(--ink-2, #2A2D3A);
}
.blog-post-content blockquote p:last-child { margin-bottom: 0; }
.blog-post-content img,
.blog-post-content figure {
    max-width: 100%;
    height: auto;
    margin: 1.6em 0;
    border-radius: var(--radius, 16px);
}
.blog-post-content code {
    background: var(--bg-soft, #F4F5F9);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.875em;
    color: var(--ink, #0B0D17);
}

.blog-post-footer {
    margin-top: clamp(40px, 5vw, 64px);
    padding-top: 24px;
    border-top: 1px solid var(--border, #ECEDF3);
}
.blog-post-taxonomy {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}
.chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-soft, #F4F5F9);
    border: 1px solid var(--border, #ECEDF3);
    border-radius: 999px;
    font-size: 0.8125rem;
    text-decoration: none;
    color: var(--ink-2, #2A2D3A);
    transition: background 0.2s ease, border-color 0.2s ease;
    font-weight: 500;
}
.chip:hover {
    background: var(--surface, #FFFFFF);
    border-color: var(--border-strong, #E1E3EC);
}
.chip--tag { color: var(--ink-3, #595D6E); }

/* Post navigation */
.blog-post-nav {
    margin-top: clamp(48px, 6vw, 72px);
    margin-bottom: clamp(40px, 5vw, 64px);
}
.blog-post-nav .nav-links {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}
@media (min-width: 720px) {
    .blog-post-nav .nav-links {
        grid-template-columns: 1fr 1fr;
    }
}
.blog-post-nav .nav-previous a,
.blog-post-nav .nav-next a {
    display: block;
    padding: 18px 22px;
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #ECEDF3);
    border-radius: var(--radius, 16px);
    text-decoration: none;
    color: var(--ink, #0B0D17);
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.blog-post-nav .nav-previous a:hover,
.blog-post-nav .nav-next a:hover {
    background: var(--bg-soft, #F4F5F9);
    border-color: var(--border-strong, #E1E3EC);
    transform: translateY(-2px);
}
.blog-post-nav .nav-next { text-align: right; }
.blog-post-nav .nav-subtitle {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ink-4, #8A8FA3);
    margin-bottom: 4px;
    font-weight: 600;
}
.blog-post-nav .nav-title {
    display: block;
    font-weight: 600;
    line-height: 1.3;
    color: var(--ink, #0B0D17);
}