:root{--bc-ink:#102027;--bc-bg:#f5fbff;--bc-card:#ffffff;--bc-cyan:#1bbbd7;--bc-blue:#2349ff;--bc-lime:#b7f34b;--bc-line:#d8e8ef}*{box-sizing:border-box}body{margin:0;font-family:Inter,Arial,sans-serif;color:var(--bc-ink);background:radial-gradient(circle at top left,#dff9ff,transparent 35%),linear-gradient(180deg,#f7fcff,#eef7f1)}a{color:#1741d7}.bc-shell{max-width:1180px;margin:auto}.bc-header{display:flex;gap:24px;align-items:center;justify-content:space-between;padding:22px 18px;position:sticky;top:0;background:rgba(245,251,255,.92);backdrop-filter:blur(12px);z-index:2;border-bottom:1px solid var(--bc-line)}.bc-brand{display:flex;align-items:center;gap:10px;font-weight:900;text-decoration:none;color:var(--bc-ink);font-size:1.25rem}.bc-logo{width:42px;height:42px}.bc-nav{display:flex;gap:8px;flex-wrap:wrap}.bc-navlink{padding:9px 12px;border:1px solid var(--bc-line);border-radius:999px;text-decoration:none;background:#fff;font-size:.92rem}.bc-main{padding:22px 18px}.bc-ribbon{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0 22px}.bc-ribbon span{background:#102027;color:#fff;border-radius:999px;padding:7px 11px;font-size:.85rem}.bc-article{background:rgba(255,255,255,.86);border:1px solid var(--bc-line);border-radius:28px;padding:34px;box-shadow:0 24px 70px rgba(20,72,105,.12)}h1{font-size:clamp(2rem,5vw,4.4rem);line-height:1.02;margin:0 0 18px;letter-spacing:-.05em}h2{font-size:1.6rem;margin:0 0 12px}.bc-lead{font-size:1.25rem;line-height:1.65;border-left:6px solid var(--bc-cyan);padding-left:18px}.bc-section{margin:34px 0;padding:24px;border-radius:22px;background:linear-gradient(135deg,#fff,#f3fbff);border:1px solid var(--bc-line)}.bc-section p{line-height:1.75;font-size:1.05rem}.bc-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px;padding:0;list-style:none}.bc-list li{background:#eefbff;border-left:5px solid var(--bc-lime);padding:12px;border-radius:12px}.bc-tool{border:2px dashed var(--bc-blue);background:#f2fbff;padding:20px;border-radius:20px;display:grid;gap:14px;margin:24px 0}.bc-tool label{font-weight:800}.bc-input{display:block;width:100%;padding:12px;border:1px solid var(--bc-line);border-radius:12px;margin-top:6px}.bc-panel{margin-top:24px;padding:26px;border-radius:24px;background:linear-gradient(135deg,#102027,#173b49);color:#fff}.bc-panel p{line-height:1.7}.bc-cta{display:inline-block;background:var(--bc-lime);color:#102027;text-decoration:none;font-weight:900;padding:14px 18px;border-radius:14px}.bc-footer{padding:30px 18px;color:#36535d}.bc-footer a{color:#1741d7}@media(max-width:760px){.bc-header{position:static;align-items:flex-start;flex-direction:column}.bc-article{padding:22px}.bc-nav{overflow:auto}.bc-list{grid-template-columns:1fr}}