:root{--bg:#f7f9fc;--panel:#fff;--text:#172033;--muted:#667085;--line:#e5eaf2;--brand:#3772FF;--brand-dark:#2459d6;--soft:#eef4ff;--code:#111827;--shadow:0 10px 28px rgba(15,23,42,.06)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.72}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:1120px;margin:0 auto;padding:0 22px}.hero{background:linear-gradient(135deg,#1f57d6,#3772FF);color:#fff;padding:58px 0 46px}.small-hero{padding:22px 0}.nav{display:flex;justify-content:space-between;align-items:center;margin-bottom:34px}.small-hero .nav{margin-bottom:0}.brand{font-weight:800;font-size:23px;color:#fff}.nav a{color:#eef4ff;margin-left:18px}.nav .brand{margin-left:0}.hero h1{font-size:40px;line-height:1.2;margin:0 0 16px}.hero p{font-size:18px;max-width:820px;color:#eef4ff;margin:0}.section{padding:34px 0}.intro{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow)}.intro h2,.section h2{color:#101828}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-items:stretch}.topic-card{display:flex;flex-direction:column;min-height:154px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;color:#0f172a;box-shadow:var(--shadow);transition:.18s ease}.topic-card:hover{text-decoration:none;border-color:rgba(55,114,255,.38);transform:translateY(-2px);box-shadow:0 14px 32px rgba(15,23,42,.09)}.topic-card strong{display:block;font-size:18px;line-height:1.35}.topic-card span{display:inline-block;margin:8px 0;color:var(--brand);font-weight:700}.topic-card p{margin:0;color:var(--muted);font-size:14px}.article-group{padding:18px 0}.article-group>h3{font-size:24px;margin:0 0 14px;color:#101828;border-left:4px solid var(--brand);padding-left:12px}.article-group>h3 span{font-size:14px;color:var(--muted);font-weight:400}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;align-items:stretch}.card-link{display:block;color:inherit;height:236px}.card-link:hover{text-decoration:none}.card{height:100%;background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow);transition:.18s ease;display:flex;flex-direction:column;overflow:hidden}.card-link:hover .card{transform:translateY(-2px);box-shadow:0 14px 32px rgba(15,23,42,.09);border-color:rgba(55,114,255,.38)}.card h2,.card h3{margin:0 0 10px;line-height:1.35;color:#10203f;font-size:21px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card p{color:var(--muted);margin:0;font-size:16px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.meta{font-size:13px;color:var(--brand);font-weight:700;margin-bottom:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.article{max-width:920px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:14px;padding:34px;overflow:hidden;box-shadow:var(--shadow)}.article h1{font-size:34px;line-height:1.25;margin:0 0 10px}.article h2,.article h3{margin-top:28px;line-height:1.35}.article .summary{font-size:17px;color:var(--muted);border-left:4px solid var(--brand);padding-left:14px}.article p{margin:13px 0}.article ul{padding-left:24px}.article li{margin:6px 0}.article blockquote{border-left:4px solid var(--brand);background:var(--soft);margin:16px 0;padding:10px 14px;color:#475569}.article pre{background:var(--code);color:#e5e7eb;padding:16px;border-radius:10px;overflow:auto}.article code{font-family:Consolas,"Cascadia Code",monospace}.footer{padding:34px 22px;color:var(--muted);font-size:14px;display:flex;justify-content:space-between;gap:16px}.pill{display:inline-block;background:var(--soft);color:var(--brand-dark);border-radius:999px;padding:4px 10px;font-size:13px;font-weight:700;margin-bottom:12px}.back{display:inline-block;margin-bottom:18px}@media(max-width:950px){.topic-grid,.grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:650px){.topic-grid,.grid{grid-template-columns:1fr}.hero h1{font-size:31px}.article{padding:22px}.card-link{height:220px}.nav,.footer{display:block}.nav a{display:inline-block;margin:10px 12px 0 0}.footer div{margin:8px 0}}

/* Fixed equal card sizing */
.topic-grid{align-items:stretch!important;grid-auto-rows:154px!important}.topic-card{box-sizing:border-box!important;height:154px!important;min-height:154px!important;max-height:154px!important;overflow:hidden!important}.topic-card strong{display:-webkit-box!important;-webkit-line-clamp:2!important;-webkit-box-orient:vertical!important;overflow:hidden!important}.topic-card p{display:-webkit-box!important;-webkit-line-clamp:2!important;-webkit-box-orient:vertical!important;overflow:hidden!important}.grid{align-items:stretch!important;grid-auto-rows:280px!important}.grid>.card-link{box-sizing:border-box!important;display:block!important;height:280px!important;min-height:280px!important;max-height:280px!important;overflow:hidden!important}.grid>.card-link>.card{box-sizing:border-box!important;height:280px!important;min-height:280px!important;max-height:280px!important;overflow:hidden!important}.card h2,.card h3{min-height:56px!important;max-height:56px!important;display:-webkit-box!important;-webkit-line-clamp:2!important;-webkit-box-orient:vertical!important;overflow:hidden!important}.card p{display:-webkit-box!important;-webkit-line-clamp:6!important;-webkit-box-orient:vertical!important;overflow:hidden!important;max-height:160px!important}@media(max-width:950px){.grid{grid-auto-rows:280px!important}.grid>.card-link,.grid>.card-link>.card{height:280px!important;min-height:280px!important;max-height:280px!important}}@media(max-width:650px){.grid{grid-auto-rows:280px!important}.grid>.card-link,.grid>.card-link>.card{height:280px!important;min-height:280px!important;max-height:280px!important}.topic-grid{grid-auto-rows:154px!important}.topic-card{height:154px!important;min-height:154px!important;max-height:154px!important}}