:root {
    --primary: #d32f2f;
    --primary-dim: rgba(211, 47, 47, 0.15);
    --bg: #0a0a0a;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --text: #e5e5e5;
    --text-dim: #888;
    --text-bright: #fff;
    --border: rgba(255, 255, 255, 0.08);
    --radius: 12px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* === LIGHT THEME === */
[data-theme="light"] {
    --bg: #f5f5f7; --bg-card: #ffffff; --bg-card-hover: #f0f0f2;
    --text: #374151; --text-dim: #6b7280; --text-bright: #111827;
    --border: rgba(0, 0, 0, 0.1); --primary-dim: rgba(59, 130, 246, 0.1);
}
.theme-toggle-float {
    position: fixed; bottom: 1.25rem; right: 1.25rem; width: 40px; height: 40px;
    border-radius: 50%; background: var(--bg-card); border: 1px solid var(--border);
    color: var(--text-dim); cursor: pointer; display: flex; align-items: center;
    justify-content: center; z-index: 1000; transition: all 0.2s;
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.theme-toggle-float:hover { color: var(--text-bright); transform: scale(1.1); }
@media print { .theme-toggle-float { display: none !important; } }

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* === NAV === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: transform 0.3s;
}
.nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: #fff;
    text-decoration: none;
}
.nav-links { display: flex; gap: 0.25rem; align-items: center; }
.nav-link {
    color: #aaa;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    transition: color 0.2s, background 0.2s;
}
.nav-link:hover, .nav-link.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
}
.nav-link-rss {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    color: #aaa;
}
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    margin: 5px 0;
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

/* === MAIN LAYOUT === */
.main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 5rem 1.5rem 3rem;
}

.layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 3rem;
    align-items: start;
}

.content-area {
    min-width: 0;
}

/* === PAGE HEADER === */
.page-header {
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}
.page-header-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    background: var(--primary-dim);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    margin-bottom: 0.75rem;
}
.page-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    color: var(--text-bright);
    line-height: 1.2;
    margin-bottom: 0.5rem;
}
.page-subtitle {
    font-size: 1.05rem;
    color: var(--text-dim);
    line-height: 1.6;
}

/* === POST CARDS === */
.posts-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
.post-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color 0.3s, transform 0.2s;
}
.post-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}
.post-card-image {
    display: block;
    aspect-ratio: 21 / 9;
    overflow: hidden;
}
.post-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s;
}
.post-card:hover .post-card-image img {
    transform: scale(1.03);
}
.post-card-body {
    padding: 1.5rem;
}
.post-card-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}
.post-card-category {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary);
    background: var(--primary-dim);
    padding: 0.2rem 0.6rem;
    border-radius: 50px;
    text-decoration: none;
    transition: background 0.2s;
}
.post-card-category:hover {
    background: rgba(59, 130, 246, 0.25);
}
.post-card-date,
.post-card-reading {
    font-size: 0.8rem;
    color: var(--text-dim);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}
.post-card-title {
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.5rem;
}
.post-card-title a {
    color: var(--text-bright);
    text-decoration: none;
    transition: color 0.2s;
}
.post-card-title a:hover {
    color: var(--primary);
}
.post-card-excerpt {
    font-size: 0.95rem;
    color: var(--text-dim);
    line-height: 1.7;
    margin-bottom: 1rem;
}
.post-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* Tags */
.tag {
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.2rem 0.6rem;
    border-radius: 50px;
    background: var(--bg-card-hover);
    color: var(--text-dim);
    text-decoration: none;
    border: 1px solid var(--border);
    transition: color 0.2s, border-color 0.2s;
}
.tag:hover, .tag-active {
    color: var(--primary);
    border-color: var(--primary);
}

/* === SIDEBAR === */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: sticky;
    top: 5rem;
}
.sidebar-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}
.sidebar-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    overflow: hidden;
    margin-bottom: 1rem;
    border: 2px solid var(--border);
}
.sidebar-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.sidebar-card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-bright);
    margin-bottom: 0.75rem;
}
.sidebar-text {
    font-size: 0.85rem;
    color: var(--text-dim);
    line-height: 1.7;
}
.sidebar-list {
    list-style: none;
}
.sidebar-list li {
    border-bottom: 1px solid var(--border);
}
.sidebar-list li:last-child {
    border-bottom: none;
}
.sidebar-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0;
    color: var(--text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}
.sidebar-link:hover, .sidebar-link.active {
    color: var(--primary);
}
.sidebar-count {
    font-size: 0.75rem;
    color: var(--text-dim);
    background: var(--bg-card-hover);
    padding: 0.15rem 0.5rem;
    border-radius: 50px;
    font-weight: 500;
}

/* === POST DETAIL === */
.post-detail {
    max-width: 760px;
    margin: 0 auto;
}
.post-header {
    margin-bottom: 2rem;
    text-align: center;
}
.post-header-meta {
    margin-bottom: 1rem;
}
.post-category-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--primary);
    background: var(--primary-dim);
    padding: 0.3rem 0.875rem;
    border-radius: 50px;
    text-decoration: none;
    transition: background 0.2s;
}
.post-category-badge:hover {
    background: rgba(59, 130, 246, 0.25);
}
.post-title {
    font-size: clamp(1.75rem, 5vw, 2.75rem);
    font-weight: 800;
    color: var(--text-bright);
    line-height: 1.15;
    margin-bottom: 1rem;
}
.post-excerpt {
    font-size: 1.15rem;
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}
.post-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: var(--text-dim);
}
.post-author {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    color: var(--text);
}
.post-author-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
}
.post-date, .post-reading-time {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}
.post-cover {
    margin-bottom: 2.5rem;
    border-radius: var(--radius);
    overflow: hidden;
}
.post-cover img {
    width: 100%;
    display: block;
}

/* === PROSE / MARKDOWN CONTENT === */
.prose {
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--text);
}
.prose h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-bright);
    margin: 2.5rem 0 1rem;
    line-height: 1.3;
}
.prose h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-bright);
    margin: 2rem 0 0.75rem;
    line-height: 1.3;
}
.prose h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-bright);
    margin: 1.5rem 0 0.5rem;
}
.prose p {
    margin-bottom: 1.25rem;
}
.prose a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}
.prose a:hover {
    text-decoration: none;
}
.prose strong {
    color: var(--text-bright);
    font-weight: 600;
}
.prose em {
    font-style: italic;
}
.prose ul, .prose ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}
.prose li {
    margin-bottom: 0.375rem;
}
.prose li::marker {
    color: var(--primary);
}
.prose blockquote {
    border-left: 3px solid var(--primary);
    padding: 0.75rem 1.25rem;
    margin: 1.5rem 0;
    background: var(--bg-card);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--text-dim);
    font-style: italic;
}
.prose blockquote p {
    margin-bottom: 0;
}
.prose code {
    font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
    font-size: 0.875em;
    background: var(--bg-card-hover);
    color: var(--primary);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}
.prose pre {
    margin: 1.5rem 0;
    padding: 1.25rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.prose pre code {
    background: none;
    color: var(--text);
    padding: 0;
    font-size: 0.85rem;
    line-height: 1.7;
}
.prose img {
    max-width: 100%;
    border-radius: var(--radius);
    margin: 1.5rem 0;
}
.prose hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2.5rem 0;
}
.prose table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.9rem;
}
.prose th, .prose td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.prose th {
    color: var(--text-bright);
    font-weight: 600;
    background: var(--bg-card);
}
.prose td {
    color: var(--text-dim);
}

/* === POST FOOTER === */
.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 2.5rem 0 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}
.post-share {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}
.post-share-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-dim);
}
.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50px;
    cursor: pointer;
    font-family: inherit;
    transition: border-color 0.2s, color 0.2s;
}
.share-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}
.share-btn.copied {
    border-color: #22c55e;
    color: #22c55e;
}

.post-back {
    margin-top: 1.5rem;
}
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}
.back-link:hover {
    color: var(--primary);
}

/* === PAGINATION === */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}
.pagination-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.6rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50px;
    text-decoration: none;
    transition: border-color 0.2s, color 0.2s;
}
.pagination-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}
.pagination-info {
    font-size: 0.85rem;
    color: var(--text-dim);
}

/* === EMPTY STATE === */
.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--text-dim);
    font-size: 1rem;
}

/* === FOOTER === */
.footer {
    border-top: 1px solid var(--border);
    padding: 2rem 1.5rem;
    margin-top: 3rem;
}
.footer .container {
    max-width: 1100px;
    margin: 0 auto;
}
.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.footer-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.footer-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text);
}
.footer-tagline {
    font-size: 0.8rem;
    color: var(--text-dim);
}
.footer-contact {
    display: flex;
    align-items: center;
}
.footer-email {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.2s;
}
.footer-email:hover {
    color: var(--primary);
}
.footer-social {
    display: flex;
    gap: 0.5rem;
}

/* Social icons */
.social-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid var(--border);
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.2s, border-color 0.2s, transform 0.2s;
}
.social-icon:hover {
    color: var(--primary);
    border-color: var(--primary);
    transform: scale(1.1);
}

/* Badge */
.badge {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}
.badge a {
    font-size: 0.7rem;
    color: var(--text-dim);
    text-decoration: none;
    opacity: 0.6;
    transition: opacity 0.2s;
}
.badge a:hover {
    opacity: 1;
}

/* === ANIMATIONS === */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* === RESPONSIVE === */
@media (max-width: 900px) {
    .layout {
        grid-template-columns: 1fr;
    }
    .sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 1rem;
    }
}

@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 10, 0.95);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.open { display: flex; }
    .nav-link { padding: 0.75rem 1rem; }
    .nav-link-rss { padding: 0.75rem 1rem; justify-content: flex-start; }
    .main { padding: 4.5rem 1rem 2rem; }
    .post-card-title { font-size: 1.15rem; }
    .post-info { flex-direction: column; gap: 0.5rem; }
    .post-share { flex-wrap: wrap; }
    .sidebar {
        grid-template-columns: 1fr;
    }
}

/* === PRINT === */
@media print {
    * { background: #fff !important; color: #111 !important; box-shadow: none !important; }
    .nav, .footer, .sidebar, .post-share, .pagination, .badge { display: none !important; }
    .main { padding: 0; }
    .layout { grid-template-columns: 1fr; }
    .post-card, .sidebar-card { border: 1px solid #ddd !important; }
    .prose pre { border: 1px solid #ddd !important; background: #f8f8f8 !important; }
    .prose code { background: #f0f0f0 !important; color: #333 !important; }
    .fade-in { opacity: 1 !important; transform: none !important; }
    .tag { background: #eee !important; color: #333 !important; border-color: #ddd !important; }
    a { text-decoration: none; }
}