:root { color-scheme: light; --ink: #0f172a; --body: #475569; --brand: #7c3aed; --line: #e2e8f0; }
* { box-sizing: border-box; }
body { margin: 0; background: #fff; color: var(--body); font: 16px/1.85 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif; }
a { color: var(--brand); text-underline-offset: 4px; }
a:hover { color: #5b21b6; }
a:focus-visible { outline: 3px solid #c4b5fd; outline-offset: 4px; border-radius: 4px; }
.topic-shell { width: min(1160px, calc(100% - 48px)); margin-inline: auto; }
.topic-header { border-bottom: 1px solid var(--line); }
.topic-header nav { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-block: 20px; }
.topic-brand { display: inline-flex; gap: 10px; align-items: center; color: var(--ink); font-weight: 800; font-size: 21px; text-decoration: none; white-space: nowrap; }
.topic-nav-links { display: flex; flex-wrap: wrap; gap: 24px; }
.topic-nav-links a, .topic-footer a { text-decoration: none; }
.topic-hero { padding: 68px 0 48px; max-width: 920px; }
.topic-eyebrow { color: var(--brand); font-weight: 700; letter-spacing: .04em; }
h1, h2, h3 { color: var(--ink); line-height: 1.4; }
h1 { font-size: clamp(30px, 4.5vw, 50px); margin: 16px 0 24px; letter-spacing: -.02em; }
.topic-lead { font-size: 19px; max-width: 800px; }
.topic-actions { display: flex; gap: 24px; flex-wrap: wrap; align-items: center; margin-top: 30px; }
.topic-button { background: var(--brand); color: white; padding: 11px 22px; border-radius: 10px; text-decoration: none; font-weight: 700; }
.topic-button:hover { background: #5b21b6; color: white; }
.topic-layout { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 64px; padding-bottom: 64px; }
.topic-content { min-width: 0; overflow-wrap: anywhere; }
.topic-content h2 { margin: 42px 0 16px; font-size: 26px; }
.topic-content h2:first-child { margin-top: 0; }
.topic-content h3 { margin: 28px 0 12px; font-size: 20px; }
.topic-content p, .topic-content ul, .topic-content ol { margin: 16px 0; }
.topic-content li { margin-block: 8px; }
.topic-content img { display: block; max-width: 100%; height: auto; border: 1px solid var(--line); border-radius: 12px; margin-block: 24px; }
.topic-content blockquote { border-left: 4px solid #a78bfa; margin: 24px 0; padding: 4px 24px; background: #f5f3ff; }
.topic-content table { width: 100%; border-collapse: collapse; font-size: 15px; }
.topic-content th, .topic-content td { border: 1px solid var(--line); text-align: left; padding: 12px; overflow-wrap: anywhere; }
.topic-content th { background: #f8fafc; color: var(--ink); }
.topic-content code { background: #f1f5f9; border-radius: 4px; padding: 2px 5px; }
.topic-aside { align-self: start; position: sticky; top: 24px; background: #f8fafc; padding: 24px; border: 1px solid var(--line); border-radius: 14px; }
.topic-aside h2 { font-size: 17px; margin: 0 0 16px; }
.topic-aside ul { padding-left: 20px; margin: 0 0 24px; }
.topic-aside ul:last-child { margin-bottom: 0; }
.topic-aside li { margin-bottom: 10px; }
.topic-footer { border-top: 1px solid var(--line); padding-block: 30px; font-size: 14px; }
.topic-footer nav { display: flex; flex-wrap: wrap; gap: 24px; }
@media (max-width: 800px) { .topic-layout { grid-template-columns: minmax(0, 1fr); gap: 36px; } .topic-aside { position: static; } }
@media (max-width: 520px) { .topic-shell { width: calc(100% - 32px); } .topic-header nav { flex-direction: column; align-items: flex-start; gap: 12px; } .topic-nav-links { gap: 18px; } .topic-hero { padding-block: 36px; } .topic-lead { font-size: 17px; } .topic-content th, .topic-content td { padding: 8px; } }