:root{--blue:#0056b3;--blue-dark:#003b7a;--text:#263238;--muted:#64748b;--border:#dbe2ea;--bg:#f4f6f9}*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;font-size:17px;line-height:1.65;color:var(--text);background:var(--bg)}a{color:var(--blue)}.site-header{background:var(--blue);color:#fff;padding:16px 20px;box-shadow:0 2px 8px #0002}.site-header-inner{max-width:1140px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px}.logo{color:#fff;text-decoration:none;font-size:23px;font-weight:700}.site-nav{display:flex;flex-wrap:wrap;gap:14px;justify-content:flex-end}.site-nav a{color:#fff;text-decoration:none;font-size:14px}.site-nav a:hover{text-decoration:underline}.layout{max-width:1140px;margin:28px auto 50px;padding:0 20px;display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px}.content{background:#fff;border:1px solid var(--border);border-radius:8px;padding:35px;box-shadow:0 1px 3px #00000008}.article-header{border-bottom:1px solid var(--border);margin-bottom:26px;padding-bottom:16px}h1{font-size:31px;line-height:1.25;margin:0 0 10px;color:#111}h2{font-size:23px;line-height:1.3;margin:32px 0 14px;color:#172033}h3{font-size:19px;margin:22px 0 8px;color:#172033}p{margin:0 0 18px}.meta{color:var(--muted);font-size:14px}.step-sequence{display:grid;gap:16px;margin:24px 0}.step-card{display:flex;gap:14px;padding:18px;border:1px solid var(--border);border-left:4px solid var(--blue);border-radius:7px;background:#fff}.step-badge{display:grid;place-items:center;flex:0 0 32px;height:32px;border-radius:50%;background:var(--blue);color:#fff;font-weight:700}.step-card p{margin-bottom:0}.article-image{display:block;max-width:100%;max-height:430px;width:auto;height:auto;margin:20px auto 8px;border:1px solid var(--border);border-radius:6px;padding:5px}.caption{text-align:center;color:var(--muted);font-size:13px;font-style:italic}.important-box{background:#fff9db;border-left:4px solid #d99a20;padding:17px;margin:22px 0;border-radius:0 6px 6px 0}.note-box{background:#eff6ff;border-left:4px solid #2563eb;padding:17px;margin:22px 0}.sidebar{background:#fff;border:1px solid var(--border);border-radius:8px;padding:22px;height:max-content;position:sticky;top:20px}.sidebar h2{font-size:19px;margin:0 0 12px}.sidebar ul{margin:0;padding-left:20px}.sidebar li{margin-bottom:8px}.ad-container{min-height:90px;margin:0 0 24px;padding:10px;border:1px dashed #cbd5e1;text-align:center}.ad-label{display:block;color:#94a3b8;font-size:10px;letter-spacing:1px;text-transform:uppercase}.back-link{display:inline-block;margin-bottom:20px}.site-footer{background:#1e293b;color:#cbd5e1;padding:30px 20px;text-align:center;font-size:14px}.site-footer a{color:#fff;margin:0 8px}@media(max-width:850px){.site-header-inner{display:block}.site-nav{justify-content:flex-start;margin-top:12px}.layout{display:block}.sidebar{position:static;margin-top:24px}.content{padding:24px}h1{font-size:27px}}