:root{color-scheme:light;--paper:#f8f7f3;--ink:#202e30;--muted:#626e71;--teal:#11656a;--line:#dce3de;--soft:#edf4f0}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.85 system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif}a{color:var(--teal);text-underline-offset:4px}a:hover{text-decoration:underline}a:focus-visible,summary:focus-visible{outline:3px solid #bd7731;outline-offset:5px;border-radius:3px}img{max-width:100%;height:auto;display:block}.skip{position:fixed;top:-100px;left:20px;z-index:100;background:#fff;padding:12px}.skip:focus{top:10px}.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:17px 4vw;border-bottom:1px solid var(--line);background:#f8f7f3f5}.brand{font-family:Georgia,"Noto Serif SC",serif;font-size:22px;font-weight:700;text-decoration:none;color:var(--ink)}.brand span{font:12px system-ui,sans-serif;color:var(--muted);margin-left:14px}.back{font-size:13px;white-space:nowrap}.layout{display:grid;grid-template-columns:230px minmax(0,980px);gap:56px;max-width:1390px;margin:auto;padding:40px 36px 0}.sidebar{position:sticky;top:110px;align-self:start;max-height:calc(100dvh - 125px);overflow-y:auto;padding-right:15px;font-size:13px}.sidebar summary{font-weight:700;margin-bottom:18px;cursor:pointer}.sidebar nav{display:grid;gap:3px}.sidebar nav a{text-decoration:none;padding:6px 9px;border-left:2px solid transparent;color:var(--muted);line-height:1.55}.sidebar nav a:hover,.sidebar nav a:focus{color:var(--teal);background:var(--soft);border-left-color:var(--teal)}.side-note{font-size:11px;color:var(--muted);border-top:1px solid var(--line);margin-top:23px;padding-top:15px}main{min-width:0}section{padding:42px 0;border-bottom:1px solid var(--line);scroll-margin-top:18px}.hero{padding-top:15px;padding-bottom:50px}.eyebrow{font-size:11px;font-weight:700;letter-spacing:.17em;color:var(--teal);margin:0 0 14px}h1,h2,h3{font-family:Georgia,"Noto Serif SC","Songti SC",serif;line-height:1.35;letter-spacing:-.025em}h1{font-size:clamp(36px,4.5vw,62px);font-weight:600;margin:0 0 23px}h2{font-size:29px;margin:0 0 20px}h3{font-size:22px}.lead{font-size:18px;max-width:700px;color:var(--muted)}p{margin:14px 0}.route-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:30px 0}.route-cards a{display:flex;flex-direction:column;gap:7px;padding:20px 16px;border:1px solid var(--line);border-radius:12px;background:#fff;text-decoration:none}.route-cards a:hover{border-color:var(--teal)}.route-cards b{font-size:15px}.route-cards span{font-size:12px;color:var(--muted)}.entry{font-size:13px;color:var(--teal);background:var(--soft);border-radius:7px;padding:10px 15px;margin:0 0 24px}ol,ul{padding-left:1.5em}li{padding-left:.25em;margin:10px 0}li::marker{color:var(--teal);font-weight:600}.notice{font-size:13px;color:var(--muted);border-left:3px solid #bc955a;padding:9px 15px;background:#f3efe6}.done,.example{padding:15px 18px;margin:22px 0;border-radius:9px;font-size:14px}.done{background:var(--soft)}.example{border:1px dashed #b7c8bf;background:#fff}.illustrated{display:grid;grid-template-columns:minmax(0,1fr) minmax(200px,290px);gap:26px;align-items:start}.compact,.rail-shot{margin:16px 0;background:#fff;padding:10px;border:1px solid var(--line);border-radius:12px;overflow:hidden}.rail-shot{max-width:230px;justify-self:end}.rail-shot img{max-height:600px;object-fit:contain;object-position:top}.compact img,.rail-shot img{border-radius:8px}figcaption{font-size:11px;color:var(--muted);line-height:1.65;padding:10px 4px 0}.table-wrap{max-width:100%;overflow-x:auto;margin:20px 0}table{width:100%;border-collapse:collapse;background:#fff;font-size:13px;min-width:540px}th,td{padding:14px 15px;text-align:left;vertical-align:top;border:1px solid var(--line)}th{background:var(--soft);font-weight:600}td:first-child{font-weight:600;white-space:nowrap}.flow{border:1px solid var(--line);padding:18px 20px;border-radius:10px;background:#fff;color:var(--teal);font-size:14px}.faq dt{font-weight:650;margin-top:24px}.faq dd{margin:7px 0 20px;color:var(--muted);font-size:14px}.support{display:grid;grid-template-columns:240px minmax(0,1fr);gap:30px;align-items:start}.qr{display:block;padding:12px;background:#fff;border:1px solid var(--line);border-radius:14px}.qr img{width:100%;height:auto}.support p:first-child{margin-top:0}.support ul{font-size:14px}.footer{padding:35px 0 60px;color:var(--muted);font-size:12px}.footer a{display:inline-block;margin-left:15px}
@media(max-width:1100px){.layout{gap:30px;grid-template-columns:205px minmax(0,1fr);padding-inline:24px}.route-cards{grid-template-columns:1fr}.illustrated{grid-template-columns:1fr}.compact{max-width:400px;margin-inline:auto}.rail-shot{justify-self:start;max-width:290px}.rail-shot img{max-height:none}}
@media(max-width:760px){html{scroll-padding-top:90px}.topbar{padding:13px 18px}.brand{font-size:19px}.brand span{display:block;margin:0;font-size:10px}.back{font-size:12px}.layout{display:block;padding:20px 20px 0}.sidebar{position:static;max-height:none;padding:0 0 20px;border-bottom:1px solid var(--line)}.sidebar nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:5px}.sidebar nav a{font-size:12px;padding:7px}.side-note{display:none}.hero{padding-top:32px}section{padding:32px 0}h2{font-size:25px}.lead{font-size:16px}.support{grid-template-columns:1fr}.qr{max-width:240px}.compact{max-width:100%}.route-cards{gap:8px}.route-cards a{padding:15px}.footer a{margin-left:0}body{font-size:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{body{background:#fff;font-size:10pt}.topbar{position:static;background:#fff}.sidebar,.back,.skip,.footer a{display:none}.layout{display:block;padding:0;max-width:none}.hero{padding-top:20px}section{padding:20px 0;break-inside:auto}h1{font-size:30pt}h2{font-size:19pt;break-after:avoid}figure,.done,.example,tr,.support{break-inside:avoid}.illustrated{display:block}.compact,.rail-shot{max-width:240px;margin:12px 0}.table-wrap{overflow:visible}table{min-width:0}.route-cards{display:block}.route-cards a{margin:8px 0}.support{grid-template-columns:160px 1fr}.qr{max-width:160px}a{color:inherit}}