:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg: #f8fafc;
    --panel-bg: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --success: #22c55e;
}
[data-theme="dark"] {
    --bg: #0f172a;
    --panel-bg: #1e293b;
    --text: #f8fafc;
    --text-secondary: #94a3b8;
    --border: #334155;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); text-decoration: underline; }

header {
    background: var(--panel-bg);
    padding: 12px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 24px;
    position: sticky;
    top: 0;
    z-index: 50;
}
.brand-link {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    margin-right: auto;
}
.brand-link:hover { text-decoration: none; }
.logo-text {
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--primary);
    letter-spacing: -0.5px;
}
nav { display: flex; gap: 20px; }
nav a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
}
nav a:hover {
    color: var(--text);
    text-decoration: none;
    border-color: var(--primary);
}
nav a.active {
    color: var(--text);
    border-color: var(--primary);
}
main {
    max-width: 860px;
    margin: 0 auto;
    padding: 48px 24px;
}
footer {
    background: var(--panel-bg);
    border-top: 1px solid var(--border);
    padding: 32px 24px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}
h1 { font-size: 2.5rem; font-weight: 800; letter-spacing: -1px; line-height: 1.2; margin-bottom: 16px; }
h2 { font-size: 1.6rem; font-weight: 700; margin-top: 40px; margin-bottom: 12px; }
h3 { font-size: 1.2rem; font-weight: 600; margin-top: 28px; margin-bottom: 8px; }
p { margin-bottom: 16px; color: var(--text-secondary); }
p + p { margin-top: -4px; }
.lead { font-size: 1.15rem; color: var(--text); margin-bottom: 32px; }
.card {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
}
.btn {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: background 0.15s;
}
.btn:hover { background: var(--primary-hover); color: white; text-decoration: none; }
.tag {
    display: inline-block;
    background: #eef2ff;
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-right: 6px;
    margin-bottom: 6px;
}
ul, ol { padding-left: 20px; margin-bottom: 16px; }
li { margin-bottom: 8px; color: var(--text-secondary); }
code {
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}
[data-theme="dark"] code { background: #1e293b; }
pre {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 20px;
}
[data-theme="dark"] pre { background: #1e293b; }
.post-card {
    display: block;
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 16px;
    transition: border-color 0.15s;
}
.post-card:hover { border-color: var(--primary); text-decoration: none; }
.post-card h3 { margin-top: 0; color: var(--text); }
.post-card:hover h3 { color: var(--primary); }
.post-card .meta { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 8px; }
.post-card p { margin-bottom: 0; }
.github-star {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #24292e;
    color: #fff;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.15s;
    white-space: nowrap;
}
.github-star:hover { background: #1b1f23; color: #fff; text-decoration: none; }
.github-star svg { width: 16px; height: 16px; fill: currentColor; }
.share-section {
    margin-top: 40px;
    padding: 24px;
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    text-align: center;
}
.share-section h3 { margin-top: 0; margin-bottom: 16px; font-size: 1rem; }
.share-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}
.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.15s;
}
.share-btn:hover { opacity: 0.85; text-decoration: none; }
.share-btn svg { width: 18px; height: 18px; fill: currentColor; }
.share-twitter { background: #1da1f2; color: #fff; }
.share-reddit { background: #ff4500; color: #fff; }
.share-linkedin { background: #0a66c2; color: #fff; }
.share-hn { background: #ff6600; color: #fff; }
@media (max-width: 640px) {
    header { flex-wrap: wrap; gap: 12px; }
    nav { order: 3; width: 100%; overflow-x: auto; gap: 16px; padding-bottom: 4px; }
    h1 { font-size: 1.8rem; }
    main { padding: 24px 16px; }
}