/* ===== Article Page Styles ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: #f8f9fa;
    color: #1a1a2e;
    line-height: 1.9;
    font-size: 16px;
}

.article-nav {
    background: #fff;
    border-bottom: 1px solid #e8e8f0;
    position: sticky;
    top: 0;
    z-index: 100;
}
.article-nav .inner {
    max-width: 800px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.article-nav .brand {
    font-weight: 800;
    font-size: 1.1rem;
    color: #1a1a2e;
    text-decoration: none;
}
.article-nav .brand span { color: #4f46e5; }
.article-nav .cta {
    background: #4f46e5;
    color: #fff;
    padding: 8px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s;
}
.article-nav .cta:hover { background: #4338ca; }

article {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 24px 80px;
    background: #fff;
    min-height: 70vh;
}

.article-meta {
    font-size: 0.85rem;
    color: #6b7280;
    margin-bottom: 24px;
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.article-meta span { background: #eef2ff; color: #4f46e5; padding: 2px 12px; border-radius: 20px; }

h1 {
    font-size: 1.9rem;
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 40px 0 16px;
    padding-left: 12px;
    border-left: 4px solid #4f46e5;
}

h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 28px 0 12px;
    color: #16213e;
}

p { margin-bottom: 16px; color: #374151; }

ul, ol { margin: 0 0 20px 24px; color: #374151; }
li { margin-bottom: 8px; }

strong { color: #111827; }

blockquote {
    background: #f0f4ff;
    border-left: 4px solid #4f46e5;
    padding: 16px 20px;
    border-radius: 0 8px 8px 0;
    margin: 24px 0;
    color: #374151;
}

.article-cta {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    color: #fff;
    margin: 48px 0;
}
.article-cta h3 { color: #fff; margin-bottom: 8px; font-size: 1.3rem; }
.article-cta p { color: rgba(255,255,255,0.85); margin-bottom: 20px; font-size: 0.95rem; }
.article-cta a {
    display: inline-block;
    background: #fff;
    color: #4f46e5;
    padding: 12px 32px;
    border-radius: 8px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s;
}
.article-cta a:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }

.toc {
    background: #f8f9fa;
    border: 1px solid #e8e8f0;
    border-radius: 12px;
    padding: 20px 24px;
    margin: 24px 0 40px;
}
.toc-title { font-weight: 700; margin-bottom: 12px; color: #111827; }
.toc a {
    display: block;
    color: #4f46e5;
    text-decoration: none;
    padding: 4px 0;
    font-size: 0.92rem;
}
.toc a:hover { text-decoration: underline; }

.footer {
    background: #1a1a2e;
    color: #7878a0;
    text-align: center;
    padding: 32px 24px;
    font-size: 0.85rem;
}
.footer a { color: #a5b4fc; text-decoration: none; }

@media (max-width: 640px) {
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.2rem; }
    article { padding: 24px 18px 60px; }
}