:root {
    --color-bg: #f7f8fa;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-text: #1f2937;
    --color-muted: #6b7280;
    --color-primary: #d90429;
    --color-primary-dark: #a00320;
    --color-primary-light: #fde8ec;
    --radius: 10px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
    --container: 1140px;
}

* {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

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

a:hover {
    color: var(--color-primary-dark);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 20px;
}

/* ------------------------- Header ------------------------- */

.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 16px;
    padding-bottom: 16px;
}

.brand {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.brand:hover {
    color: var(--color-primary);
}

.main-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
}

.main-nav a {
    color: var(--color-muted);
    padding: 8px 14px;
    border-radius: 8px;
    font-weight: 500;
}

.main-nav a:hover {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* ------------------------- Main ------------------------- */

.site-main {
    padding: 40px 0 60px;
    min-height: 60vh;
}

.page-header {
    margin-bottom: 28px;
}

.page-title {
    font-size: 2rem;
    margin: 0 0 6px;
    letter-spacing: -0.02em;
}

.page-subtitle {
    color: var(--color-muted);
    margin: 0;
}

/* ------------------------- Alerts ------------------------- */

.alert {
    padding: 14px 18px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-weight: 500;
}

.alert-success {
    background: #ecfdf5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* ------------------------- Toolbar ------------------------- */

.blog-toolbar {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 28px;
}

.search-form {
    display: flex;
    gap: 8px;
}

.search-form input[type="search"] {
    flex: 1;
    max-width: 420px;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    background: var(--color-surface);
}

.search-form button {
    padding: 12px 22px;
    border: none;
    border-radius: var(--radius);
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

.search-form button:hover {
    background: var(--color-primary-dark);
}

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.category-filter {
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    color: var(--color-muted);
    background: var(--color-surface);
    font-size: 0.9rem;
    font-weight: 500;
}

.category-filter:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.category-filter.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

/* ------------------------- Blog grid ------------------------- */

.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.blog-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.blog-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.blog-card-media {
    display: block;
    aspect-ratio: 16 / 9;
    background: #eef0f3;
    overflow: hidden;
}

.blog-card-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.blog-card-media-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--color-muted);
    font-size: 0.85rem;
}

.blog-card-body {
    padding: 18px 20px 22px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

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

.blog-card-title {
    font-size: 1.15rem;
    line-height: 1.35;
    margin: 0;
}

.blog-card-title a {
    color: var(--color-text);
}

.blog-card-title a:hover {
    color: var(--color-primary);
}

.blog-card-excerpt {
    color: var(--color-muted);
    font-size: 0.92rem;
    margin: 0;
}

/* ------------------------- Pagination ------------------------- */

.pagination {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: 40px;
}

.page-link {
    display: inline-block;
    padding: 8px 14px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    background: var(--color-surface);
    font-weight: 500;
}

.page-link:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.page-link.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

/* ------------------------- Empty state ------------------------- */

.empty-state {
    text-align: center;
    padding: 70px 20px;
    color: var(--color-muted);
}

.empty-state h2 {
    color: var(--color-text);
    margin-bottom: 8px;
}

/* ------------------------- Blog detail ------------------------- */

.blog-detail {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px;
    box-shadow: var(--shadow);
}

.blog-detail-header {
    margin-bottom: 24px;
}

.blog-detail-title {
    font-size: 2.1rem;
    line-height: 1.25;
    margin: 0 0 12px;
    letter-spacing: -0.02em;
}

.blog-detail-meta {
    color: var(--color-muted);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.blog-detail-image {
    margin: 0 0 8px;
}

.blog-detail-image img {
    width: 100%;
    border-radius: var(--radius);
}

.blog-detail-content {
    font-size: 1.05rem;
    line-height: 1.8;
    word-wrap: break-word;
}

.blog-detail-content h1,
.blog-detail-content h2,
.blog-detail-content h3,
.blog-detail-content h4 {
    line-height: 1.3;
    margin: 1.5em 0 0.5em;
}

.blog-detail-content p {
    margin: 0 0 1.1em;
}

.blog-detail-content img {
    border-radius: 8px;
}

.blog-detail-content blockquote {
    border-left: 4px solid var(--color-primary);
    margin: 1.2em 0;
    padding: 4px 0 4px 20px;
    color: var(--color-muted);
}

.blog-detail-content a {
    text-decoration: underline;
}

/* ------------------------- Comments ------------------------- */

.blog-comments {
    margin-top: 40px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 36px;
    box-shadow: var(--shadow);
}

.comments-title {
    margin: 0 0 18px;
    font-size: 1.4rem;
}

.comments-empty {
    color: var(--color-muted);
}

.comments-list {
    list-style: none;
    margin: 0 0 28px;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.comment {
    padding: 16px 18px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
}

.comment-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 6px;
}

.comment-name {
    color: var(--color-text);
}

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

.comment-body {
    margin: 0;
}

.comment-form-title {
    font-size: 1.2rem;
    margin: 0 0 14px;
}

.comment-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-weight: 600;
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    background: #fff;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.btn {
    display: inline-block;
    padding: 12px 26px;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
}

/* ------------------------- Footer ------------------------- */

.site-footer {
    background: #14181f;
    color: #cbd5e1;
    margin-top: 60px;
}

.footer-inner {
    display: grid;
    grid-template-columns: 1.3fr 1fr 1.4fr;
    gap: 40px;
    padding-top: 48px;
    padding-bottom: 48px;
}

.site-footer h4 {
    color: #fff;
    margin: 0 0 14px;
}

.site-footer p {
    margin: 0 0 8px;
}

.footer-links ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a,
.social-links a {
    color: #cbd5e1;
}

.footer-links a:hover,
.social-links a:hover {
    color: #fff;
}

.newsletter-form {
    display: flex;
    gap: 8px;
}

.newsletter-form input {
    flex: 1;
    padding: 11px 14px;
    border: 1px solid #334155;
    border-radius: var(--radius);
    background: #1e2530;
    color: #fff;
}

.newsletter-form input::placeholder {
    color: #64748b;
}

.newsletter-form button {
    padding: 11px 18px;
    border: none;
    border-radius: var(--radius);
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

.footer-bottom {
    border-top: 1px solid #24303f;
    padding: 18px 0;
    font-size: 0.85rem;
}

.footer-bottom .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom p {
    margin: 0;
}

.social-links {
    display: flex;
    gap: 16px;
}

/* ------------------------- Responsive ------------------------- */

@media (max-width: 900px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 28px;
    }
}

@media (max-width: 640px) {
    .blog-grid {
        grid-template-columns: 1fr;
    }

    .blog-detail,
    .blog-comments {
        padding: 24px 20px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .blog-detail-title {
        font-size: 1.6rem;
    }
}