:root,
[data-theme="light"] {
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --card-top-bg: #f8f9fa;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #e9ecef;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --btn-hover-bg: #e2e6ea;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --card-top-bg: #252525;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border-color: #2c2c2c;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --btn-hover-bg: #2a2a2a;
}

body {
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.posts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px;
    max-width: 1200px;
    margin: 0 auto;
}

@media (min-width: 600px) {
    .posts-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 20px;
        padding: 20px;
    }
}

.post-card {
    display: flex;
    flex-direction: column;
    height: 250px;
    border-radius: 12px;
    background-color: var(--card-bg);
    cursor: pointer;
    overflow: hidden;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1), 0 3px 6px rgba(0, 0, 0, 0.15);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15), 0 6px 6px rgba(0, 0, 0, 0.10);
}

.card-top {
    flex: 1;
    padding: 16px;
    display: flex;
    align-items: center;
    background-color: var(--card-top-bg);
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.card-bottom {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
}

.card-description {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-tags {
    margin-top: auto;
    padding-top: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-footer {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-top: 8px;
}

.card-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.8;
}

.post-view {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.back-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.back-tile {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 20px;
    margin-bottom: 24px;
    border-radius: 12px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 8px var(--shadow-color);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.back-tile:hover {
    transform: translateY(-2px);
    background-color: var(--card-top-bg);
    box-shadow: 0 6px 12px var(--shadow-color);
}

.back-tile-icon {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--text-primary);
    line-height: 1;
}

.back-tile-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.back-tile-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.back-tile-subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.post {
    max-width: 800px;
    margin: 0 auto;
    padding: 28px 24px;
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--card-top-bg) 100%);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 4px 12px var(--shadow-color);
}

.post header h1 {
    margin: 0 0 8px 0;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
}

.post-meta {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.post hr {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 20px 0;
}

.post-body {
    color: var(--text-primary);
    line-height: 1.65;
    font-size: 0.95rem;
}

.post-body p {
    margin: 0 0 16px 0;
}

.post-body ul {
    margin: 0 0 16px 0;
    padding-left: 20px;
}

.post-body li {
    margin-bottom: 10px;
    color: var(--text-primary);
}

.post-body li strong {
    color: var(--text-primary);
}