:root {
    --blog-bg: #f8fafc;
    --blog-surface: #ffffff;
    --blog-surface-hover: #f1f5f9;
    --blog-text: #1e293b;
    --blog-text-secondary: #64748b;
    --blog-text-muted: #94a3b8;
    --blog-border: #e2e8f0;
    --blog-accent: #6366f1;
    --blog-accent-light: #818cf8;
    --blog-accent-bg: rgba(99, 102, 241, 0.08);
    --blog-tag-bg: #f1f5f9;
    --blog-tag-text: #475569;
    --blog-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --blog-shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.08);
    --blog-radius: 12px;
    --blog-code-bg: #f1f5f9;
    --blog-blockquote-bg: #f8fafc;
    --blog-blockquote-border: #6366f1;
    --blog-table-stripe: #f8fafc;
    --blog-hero-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
}

[data-theme="dark"] {
    --blog-bg: #0f172a;
    --blog-surface: #1e293b;
    --blog-surface-hover: #334155;
    --blog-text: #f1f5f9;
    --blog-text-secondary: #94a3b8;
    --blog-text-muted: #64748b;
    --blog-border: #334155;
    --blog-accent: #818cf8;
    --blog-accent-light: #a5b4fc;
    --blog-accent-bg: rgba(129, 140, 248, 0.12);
    --blog-tag-bg: #334155;
    --blog-tag-text: #cbd5e1;
    --blog-shadow: 0 1px 3px rgba(0, 0, 0, 0.2), 0 1px 2px rgba(0, 0, 0, 0.15);
    --blog-shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.3);
    --blog-code-bg: #1e293b;
    --blog-blockquote-bg: #1e293b;
    --blog-blockquote-border: #818cf8;
    --blog-table-stripe: #1e293b;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--blog-bg);
    color: var(--blog-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ─── NAV ──────────────────────────────────────────── */

.blog-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--blog-surface);
    border-bottom: 1px solid var(--blog-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.blog-nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.blog-nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--blog-text);
}

.blog-nav-brand span:first-child {
    background: var(--blog-hero-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.blog-nav-links a {
    text-decoration: none;
    color: var(--blog-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s;
}

.blog-nav-links a:hover {
    color: var(--blog-accent);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--blog-border);
    border-radius: 8px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--blog-text-secondary);
    font-size: 1rem;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background: var(--blog-surface-hover);
    color: var(--blog-text);
}

/* ─── HERO ─────────────────────────────────────────── */

.blog-hero {
    background: var(--blog-hero-gradient);
    padding: 3.5rem 1.5rem 3rem;
    text-align: center;
    color: #fff;
}

.blog-hero h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.blog-hero p {
    font-size: 1.05rem;
    opacity: 0.9;
    max-width: 520px;
    margin: 0 auto;
}

/* ─── FILTERS ──────────────────────────────────────── */

.blog-filters {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem 1.5rem 0;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.4rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--blog-border);
    background: var(--blog-surface);
    color: var(--blog-text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-btn:hover {
    border-color: var(--blog-accent);
    color: var(--blog-accent);
}

.filter-btn.active {
    background: var(--blog-accent);
    border-color: var(--blog-accent);
    color: #fff;
}

/* ─── POST GRID ────────────────────────────────────── */

.blog-grid {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.25rem;
}

.post-card {
    background: var(--blog-surface);
    border: 1px solid var(--blog-border);
    border-radius: var(--blog-radius);
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    transition: all 0.25s ease;
    box-shadow: var(--blog-shadow);
}

.post-card:hover {
    box-shadow: var(--blog-shadow-lg);
    border-color: var(--blog-accent);
    transform: translateY(-2px);
}

.post-card-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.post-category {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.post-category.announcement {
    background: rgba(99, 102, 241, 0.12);
    color: var(--blog-accent);
}

.post-category.story {
    background: rgba(16, 185, 129, 0.12);
    color: #10b981;
}

.post-date {
    font-size: 0.8rem;
    color: var(--blog-text-muted);
}

.post-card h2 {
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 0.5rem;
    color: var(--blog-text);
    letter-spacing: -0.01em;
}

.post-card p {
    font-size: 0.9rem;
    color: var(--blog-text-secondary);
    line-height: 1.6;
    flex: 1;
}

.post-card-footer {
    margin-top: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.read-more {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--blog-accent);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.read-more::after {
    content: "\2192";
    transition: transform 0.2s;
}

.post-card:hover .read-more::after {
    transform: translateX(3px);
}

.post-tags {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.post-tag {
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    background: var(--blog-tag-bg);
    color: var(--blog-tag-text);
}

/* ─── ARTICLE LAYOUT ───────────────────────────────── */

.article-wrapper {
    max-width: 760px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

.article-back {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    text-decoration: none;
    color: var(--blog-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 2rem;
    transition: color 0.2s;
}

.article-back:hover {
    color: var(--blog-accent);
}

.article-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--blog-border);
}

.article-header .post-category {
    margin-bottom: 0.75rem;
}

.article-header h1 {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.3;
    letter-spacing: -0.025em;
    margin-bottom: 1rem;
    color: var(--blog-text);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    color: var(--blog-text-muted);
    font-size: 0.875rem;
}

.article-meta-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.article-meta-divider {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--blog-text-muted);
}

/* ─── ARTICLE CONTENT ──────────────────────────────── */

.article-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--blog-text);
}

.article-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 2.5rem 0 1rem;
    letter-spacing: -0.02em;
    color: var(--blog-text);
}

.article-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 2rem 0 0.75rem;
    color: var(--blog-text);
}

.article-content p {
    margin-bottom: 1.25rem;
}

.article-content a {
    color: var(--blog-accent);
    text-decoration: underline;
    text-decoration-color: rgba(99, 102, 241, 0.3);
    text-underline-offset: 2px;
    transition: text-decoration-color 0.2s;
}

.article-content a:hover {
    text-decoration-color: var(--blog-accent);
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.4rem;
}

.article-content li ul,
.article-content li ol {
    margin-top: 0.4rem;
    margin-bottom: 0;
}

.article-content strong {
    font-weight: 600;
    color: var(--blog-text);
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--blog-radius);
    margin: 1.5rem 0;
    box-shadow: var(--blog-shadow-lg);
}

.article-content blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.25rem;
    border-left: 3px solid var(--blog-blockquote-border);
    background: var(--blog-blockquote-bg);
    border-radius: 0 8px 8px 0;
    color: var(--blog-text-secondary);
    font-style: italic;
}

.article-content blockquote p:last-child {
    margin-bottom: 0;
}

.article-content code {
    background: var(--blog-code-bg);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: 'SF Mono', SFMono-Regular, Consolas, monospace;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    border-radius: var(--blog-radius);
    overflow: hidden;
    border: 1px solid var(--blog-border);
}

.article-content th {
    background: var(--blog-accent-bg);
    font-weight: 600;
    text-align: left;
    padding: 0.75rem 1rem;
    border-bottom: 2px solid var(--blog-border);
}

.article-content td {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--blog-border);
}

.article-content tr:nth-child(even) td {
    background: var(--blog-table-stripe);
}

.article-content hr {
    border: none;
    height: 1px;
    background: var(--blog-border);
    margin: 2.5rem 0;
}

/* ─── CTA ──────────────────────────────────────────── */

.article-cta {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--blog-accent-bg);
    border: 1px solid var(--blog-border);
    border-radius: var(--blog-radius);
    text-align: center;
}

.article-cta p {
    margin-bottom: 1rem;
    font-size: 1rem;
    color: var(--blog-text-secondary);
}

.article-cta a.cta-button {
    display: inline-block;
    padding: 0.65rem 1.5rem;
    background: var(--blog-accent);
    color: #fff;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.article-cta a.cta-button:hover {
    background: var(--blog-accent-light);
    transform: translateY(-1px);
}

/* ─── FOOTER ───────────────────────────────────────── */

.blog-footer {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    border-top: 1px solid var(--blog-border);
    text-align: center;
    color: var(--blog-text-muted);
    font-size: 0.85rem;
}

.blog-footer a {
    color: var(--blog-accent);
    text-decoration: none;
}

.blog-footer a:hover {
    text-decoration: underline;
}

/* ─── RESPONSIVE ───────────────────────────────────── */

@media (max-width: 768px) {
    .blog-hero h1 {
        font-size: 1.5rem;
    }

    .blog-hero p {
        font-size: 0.95rem;
    }

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

    .article-header h1 {
        font-size: 1.5rem;
    }

    .article-content {
        font-size: 1rem;
    }

    .blog-nav-links .nav-hide-mobile {
        display: none;
    }
}

@media (max-width: 480px) {
    .blog-hero {
        padding: 2.5rem 1rem 2rem;
    }

    .blog-grid {
        padding: 1rem;
    }

    .post-card {
        padding: 1.25rem;
    }

    .article-wrapper {
        padding: 1.5rem 1rem 3rem;
    }
}