/* ===== CSS Variables (matches main site) ===== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-card: #16161f;
    --bg-card-hover: #1c1c28;
    --text-primary: #f0f0f5;
    --text-secondary: #8888a0;
    --text-muted: #55556a;
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.3);
    --accent-soft: rgba(59, 130, 246, 0.1);
    --gradient-start: #1a1a2e;
    --gradient-end: #0a0a0f;
    --border: rgba(255, 255, 255, 0.06);
}

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

body {
    font-family: 'Noto Sans JP', 'Inter', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.8;
    font-size: 15px;
}

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

.accent { color: var(--accent); }

/* ===== Blog Hero ===== */
.blog-hero {
    text-align: center;
    padding: 120px 32px 48px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}
.blog-hero h1 {
    font-family: 'Inter', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
}
.blog-hero p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== Blog Container ===== */
.blog-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 48px 32px 80px;
}

/* ===== Blog Card (article list) ===== */
.blog-card {
    margin-bottom: 24px;
    border-radius: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    transition: background 0.2s, border-color 0.2s;
}
.blog-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-glow);
}
.blog-card a {
    color: inherit;
    text-decoration: none;
    display: block;
}
.blog-card-body {
    padding: 24px;
}
.blog-card-body time {
    font-size: 0.8rem;
    color: var(--text-muted);
}
.blog-card-body h2 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 8px 0;
    color: var(--text-primary);
}
.blog-card-body p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Blog Tags ===== */
.blog-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}
.blog-tag {
    font-size: 0.75rem;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 2px 10px;
    border-radius: 12px;
}

/* ===== Blog Article (single post) ===== */
.blog-article {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 32px 80px;
}
.blog-article-header {
    padding-top: 120px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 32px;
}
.blog-article-header time {
    font-size: 0.85rem;
    color: var(--text-muted);
}
.blog-article-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 12px 0 16px;
    line-height: 1.4;
}

/* ===== Article Body ===== */
.blog-article-body {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 2;
}
.blog-article-body h2 {
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 700;
    margin: 48px 0 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}
.blog-article-body h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin: 32px 0 12px;
}
.blog-article-body p {
    margin-bottom: 16px;
}
.blog-article-body ul, .blog-article-body ol {
    margin-bottom: 16px;
    padding-left: 24px;
}
.blog-article-body li {
    margin-bottom: 6px;
}
.blog-article-body code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
}
.blog-article-body pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 16px;
}
.blog-article-body pre code {
    background: none;
    padding: 0;
}
.blog-article-body blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 16px;
    margin: 16px 0;
    color: var(--text-muted);
}
.blog-article-body img {
    max-width: 100%;
    border-radius: 8px;
    margin: 16px 0;
}
.blog-article-body a {
    color: var(--accent);
}
.blog-article-body a:hover {
    text-decoration: underline;
}

/* ===== Language Switch ===== */
.blog-lang-switch {
    display: flex;
    gap: 16px;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}
.blog-lang-switch a {
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.blog-lang-switch a:hover {
    color: var(--accent);
}

/* ===== Back Link ===== */
.blog-back {
    margin-top: 32px;
}
.blog-back a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.blog-back a:hover {
    color: var(--accent);
}

/* ===== Footer (matches main site) ===== */
footer {
    background: var(--gradient-start);
    border-top: 1px solid var(--border);
    padding: 48px 32px;
    text-align: center;
}
.footer-brand {
    font-family: 'Inter', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
}
.footer-tagline {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 24px;
}
.footer-social {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}
.footer-social a {
    color: var(--text-muted);
    transition: color 0.2s;
}
.footer-social a:hover { color: var(--text-primary); }
.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 20px;
}
.footer-links a {
    color: var(--text-secondary);
    font-size: 0.8rem;
}
.footer-links a:hover {
    color: var(--text-primary);
}
.footer-copy {
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
    .blog-hero { padding: 100px 16px 32px; }
    .blog-hero h1 { font-size: 1.5rem; }
    .blog-container { padding: 32px 16px 60px; }
    .blog-article { padding: 0 16px 60px; }
    .blog-article-header { padding-top: 100px; }
    .blog-article-header h1 { font-size: 1.4rem; }
}