/* 全体のリセットと共通設定 */
:root {
    --bg-color: #000000;
    --card-bg: #0e0e0e;
    --text-color: #e2e8f0;
    --text-muted: #94a3b8;
    --primary: #91f0f3;
    --primary-hover: #c084fc;
    --border-color: #2d3142;
    --code-bg: #1e2230;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
}

.container {
    max-width: 840px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    background-color: rgba(22, 24, 32, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 15px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--primary);
}

nav a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    transition: color 0.2s;
}

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

.hero {
    padding: 60px 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    background: radial-gradient(circle at top, rgba(168,85,247,0.1) 0%, transparent 70%);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 850;
    margin-bottom: 15px;
    letter-spacing: -1px;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.posts-grid {
    padding: 40px 0;
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.post-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    transition: transform 0.2s, border-color 0.2s;
}

.post-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

.post-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.post-card h2 {
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.post-card h2 a {
    color: #fff;
    text-decoration: none;
}

.post-card h2 a:hover {
    color: var(--primary);
}

.post-card p {
    color: var(--text-muted);
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.read-more {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
}

.md-content {
    padding: 40px 0;
}

.post-date {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.md-content h1 {
    font-size: 2.2rem;
    margin-bottom: 30px;
    line-height: 1.3;
}

.md-content h2 {
    font-size: 1.6rem;
    margin-top: 40px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.md-content h3 {
    font-size: 1.2rem;
    margin-top: 25px;
    margin-bottom: 12px;
}

.md-content p {
    margin-bottom: 20px;
    color: #cbd5e1;
}
.md-content a {
    margin-bottom: 20px;
    color: #2587ff;
}

.md-content strong {
    color: var(--primary-hover);
}

.md-content ul, .md-content ol {
    margin-left: 20px;
    margin-bottom: 20px;
    color: #cbd5e1;
}

.md-content li {
    margin-bottom: 8px;
}

.md-content pre {
    background-color: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 25px;
}

.md-content code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9rem;
    color: #f1f5f9;
}

.md-content blockquote {
    border-left: 4px solid var(--primary);
    background-color: rgba(168, 85, 247, 0.05);
    padding: 15px 20px;
    margin-bottom: 25px;
    border-radius: 0 8px 8px 0;
}

.md-content blockquote p {
    margin-bottom: 0;
    font-size: 0.95rem;
    color: #cbd5e1;
}

footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}