:root{--navy:#060a14;--ink:#182748;--muted:#586783;--blue:#3d6fe8;--violet:#6d43c7;--line:#dce2ef;--bg:#f7f8fc}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.65}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:5px}.skip{position:fixed;left:12px;top:-80px;z-index:200;background:white;padding:10px}.skip:focus{top:12px}header{background:var(--navy);color:white;position:sticky;top:0;z-index:20;border-bottom:1px solid #202735}.header-inner{max-width:1280px;margin:auto;padding:18px 40px;display:flex;align-items:center;justify-content:space-between;gap:20px}header img{width:132px;display:block}.header-actions{display:flex;align-items:center;gap:22px;font-size:13px}.platform{font-size:10px;letter-spacing:1.8px;color:#9fa8bf}.header-actions button{background:transparent;border:1px solid #394258;color:white;padding:5px 12px;border-radius:5px}.product-link{color:#c8d6ff}.hero{background:var(--navy);color:white;border-bottom:1px solid #222a3d;position:relative;overflow:hidden}.hero:after{content:"";position:absolute;width:660px;height:660px;border:1px solid #222a3d;border-radius:50%;right:-300px;top:-280px;pointer-events:none;box-shadow:0 0 0 90px #121a2a66,0 0 0 180px #121a2a33}.hero-inner{max-width:1200px;padding:58px 40px 40px;margin:auto;position:relative;z-index:1}.eyebrow{font-size:11px;letter-spacing:1.8px;font-weight:700;color:var(--blue)}.hero .eyebrow{color:#a8beff}h1{font-size:clamp(36px,4vw,56px);letter-spacing:-1.6px;line-height:1.15;margin:18px 0}#hero-sub{color:#bac5d9;max-width:670px;margin:0 0 30px;font-size:17px}.route-picker{display:flex;gap:12px;max-width:730px}.route-picker button{text-align:left;width:50%;padding:18px 20px;color:#d3d9e7;border:1px solid #354057;background:#101725;border-radius:9px;font-weight:700;line-height:1.5}.route-picker button span{display:block;font-weight:400;font-size:13px;color:#a9b5cb;margin-top:4px}.route-picker button.selected{border-color:#7d9ef5;background:#172d5b;color:white;box-shadow:inset 0 0 0 1px #7d9ef5}.route-picker button.selected span{color:#c7d7ff}.journey{display:flex;flex-wrap:wrap;gap:14px;margin-top:31px;font-size:12px;color:#bcc6da}.journey b{font-size:10px;color:#a8beff;margin-right:6px}.journey i{font-style:normal;color:#5b6c8d}.guide-layout{max-width:1200px;margin:auto;display:grid;grid-template-columns:210px minmax(0,1fr);gap:56px;padding:45px 40px 70px}aside{position:sticky;top:110px;align-self:start;font-size:13px;max-height:calc(100vh - 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.hero #hero-sub{margin-bottom:0}.hero .journey{margin-top:26px}

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.foot{background:transparent;color:var(--muted);display:block;padding:34px 0 0;border-top:1px solid var(--line);margin-top:70px;font-size:12px;line-height:1.7}.foot p{margin:0 0 8px}.foot a{display:inline;color:var(--muted)}.foot a:hover{color:var(--blue)}.related{margin:52px 0 0;padding-top:30px;border-top:1px solid var(--line)}.related h2{font-family:Inter,sans-serif;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin-bottom:20px}.related ul{list-style:none;padding:0;margin:0}.related li{margin-bottom:10px}.related a{color:var(--muted);font-size:15px}.related a:hover{color:var(--blue)}

#chapters > .guide-section:last-child{border-bottom:0;padding-bottom:0;margin-bottom:0}