:root{color-scheme:light;--ink:#1a2840;--muted:#59677c;--line:#dfe5ed;--blue:#2768c7;--purple:#7650b6;--orange:#bd5a28;--paper:#fff;--accent:#e67b3e}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;background:#f7f9fc;color:var(--ink);font-family:Inter,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.65}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible,.map-scroll:focus-visible{outline:3px solid #2272e3;outline-offset:4px}.topbar,main,footer{width:min(1420px,calc(100% - 80px));margin:auto}.topbar{height:82px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:650;font-size:16px}.brand-mark{background:var(--ink);color:white;display:grid;place-items:center;width:34px;height:34px;border-radius:9px;font-size:22px;font-weight:700;line-height:1;letter-spacing:-1px}.edition{font-size:14px;color:var(--muted)}.intro{padding:36px 0 27px}.eyebrow{margin:0 0 7px;font-size:14px;font-weight:600;letter-spacing:.07em;color:var(--muted)}h1{font-size:clamp(30px,3vw,44px);letter-spacing:-.045em;line-height:1.25;margin:0 0 12px;font-weight:750}.lead{margin:0;color:var(--muted);font-size:17px}.reading-key{display:flex;gap:24px;margin-top:19px;color:var(--muted);font-size:14px}.reading-key>span{display:flex;align-items:center;gap:9px}.key-line{width:22px;height:2px;background:var(--ink)}.key-square{width:12px;height:12px;border:1.5px solid var(--muted);border-radius:3px}.section-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;gap:15px}.section-bar h2{font-size:16px;margin:0;font-weight:650}.scroll-hint{font-size:14px;color:var(--muted)}.map-scroll{overflow-x:auto;background:white;border:1px solid var(--line);border-radius:15px;scrollbar-color:#a9b5c6 #edf1f6;scrollbar-width:thin;overscroll-behavior-x:contain}.map-board{min-width:1235px;display:grid;grid-template-columns:190px 158px 232px minmax(615px,1fr);grid-template-rows:47px repeat(3,143px);padding:0 20px 18px;column-gap:12px;position:relative;background:linear-gradient(90deg,#f8fafc 0,#fff 25%)}.era-label{display:flex;align-items:center;gap:9px;color:#46566b;font-size:14px;font-weight:650;border-bottom:1px solid var(--line)}.era-label span{font-weight:400;color:#6f7b8e;font-size:13px}.era-before{grid-column:1}.era-turn{grid-column:2;color:var(--orange)}.era-base{grid-column:3}.era-routes{grid-column:4}.before-panel{grid-column:1;grid-row:2/5;padding:22px 12px 0 0}.panel-caption{font-size:14px;margin:0 0 17px;color:var(--muted)}.history-card{display:flex;align-items:center;gap:12px;border:1px solid #dfe5ed;border-radius:9px;background:#fff;width:100%;text-align:left;padding:14px 10px;margin-bottom:12px;transition:background .15s,border-color .15s}.history-card strong{display:block;font-size:16px}.history-card small{display:block;font-size:13px;line-height:1.55;color:var(--muted);margin-top:3px}.history-symbol{width:28px;text-align:center;color:#516681;font-size:22px}.panel-foot{font-size:13px;color:var(--muted);line-height:1.8;margin:18px 0 0}.turn-panel{grid-column:2;grid-row:2/5;display:flex;flex-direction:column;align-items:center;position:relative;padding-top:27px;border-left:2px solid #f0b18a;margin-left:9px;background:linear-gradient(90deg,#fff5ec,transparent 90%)}.turn-year{font-size:38px;font-weight:700;letter-spacing:-.05em;color:#bd5a28;margin-top:42px}.turn-node{border:1px solid #e5a37d;background:#fff9f3;border-radius:12px;padding:22px 9px 17px;width:155px;position:relative;margin-left:-3px;margin-top:16px;box-shadow:0 5px 15px #d7783b0a;text-align:center}.turn-node strong{display:block;font-size:17px;letter-spacing:-.025em}.turn-node>span:not(.turn-dot){display:block;font-size:14px;color:#8b512f;line-height:1.75;margin:9px 0}.turn-node small{font-size:12px;color:#946b51}.turn-dot{position:absolute;top:-7px;left:calc(50% - 6px);height:12px;width:12px;background:#e67b3e;border-radius:50%;box-shadow:0 0 0 5px #fbe8d9}.turn-note{margin-top:37px;font-size:13px;color:#986544}.base-panel{grid-column:3;grid-row:2/5;padding:22px 15px 0 15px}.base-card{width:100%;padding:13px 12px;text-align:left;background:#edf3fb;border:1px solid #d6e2f1;border-radius:9px}.node-year{display:block;font-size:12px;font-weight:650;letter-spacing:.02em;color:var(--muted);margin-bottom:4px}.base-card strong{display:block;font-size:16px;line-height:1.4}.base-card>span:last-child{display:block;color:#596b81;font-size:13px;margin-top:7px}.base-connector{height:18px;width:1px;display:block;background:#b8c9df;margin-left:21px}.route{grid-column:4;position:relative;padding:16px 0 9px 14px;border-bottom:1px solid #ecf0f5;--route-color:var(--blue);--tint:#f1f6fd;--route-border:#ccddf4}.route-vision{grid-row:2}.route-generation{grid-row:3;--route-color:var(--purple);--tint:#f7f3fd;--route-border:#e0d3f1}.route-reasoning{grid-row:4;--route-color:var(--orange);--tint:#fff6ee;--route-border:#f1dac8;border-bottom:0}.route-title{display:flex;align-items:center;gap:8px;margin-bottom:10px;flex-wrap:wrap}.route-title h3{font-size:15px;color:var(--route-color);margin:0;line-height:1.5}.route-title p{font-size:12px;color:var(--muted);margin:0 0 0 auto}.route-number{font-size:12px;font-weight:650;color:var(--route-color);border:1px solid var(--route-border);border-radius:4px;padding:0 4px}.route-nodes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px;position:relative}.route-nodes::before{content:"";position:absolute;left:-29px;right:12px;top:44px;background:var(--route-border);height:2px}.node{border:1px solid var(--route-border);background:var(--tint);border-radius:9px;position:relative;padding:11px 12px 12px;text-align:left;min-height:88px;transition:transform .15s,box-shadow .15s,border-color .15s}.node strong{display:block;font-size:15px;line-height:1.45;letter-spacing:-.015em}.node>span:last-child{font-size:13px;display:block;color:var(--muted);margin-top:5px;line-height:1.55}.node .node-year{color:var(--route-color)}.extension{border-style:dashed;background:#fff}.node.is-selected{border:2px solid var(--route-color);padding:10px 11px 11px;box-shadow:0 3px 12px #1c294414}.base-card.is-selected,.history-card.is-selected{border:2px solid #526f92}.turn-node.is-selected{border:2px solid #d5763d;padding:21px 8px 16px;box-shadow:0 4px 18px #d7783b16}@media(hover:hover){.node:hover{transform:translateY(-2px);box-shadow:0 4px 12px #1c294412}.history-card:hover,.base-card:hover{border-color:#819ab8;background:#edf3fb}.turn-node:hover{background:#fff0e2}}.map-caption{display:flex;justify-content:space-between;gap:16px;margin:11px 2px 0;color:var(--muted);font-size:13px}.map-caption p{margin:0}.map-caption>span{display:flex;align-items:center;gap:7px;white-space:nowrap}.dashed-key{display:block;width:19px;border-top:1px dashed #8793a5}.detail{display:grid;grid-template-columns:1.25fr 1fr;gap:48px;margin-top:27px;padding:28px 32px;background:#fff;border:1px solid var(--line);border-radius:13px;scroll-margin-top:20px}.detail-main h2{font-size:27px;letter-spacing:-.035em;margin:0 0 9px;line-height:1.35}.detail .eyebrow{font-size:13px}.understanding{font-size:19px;font-weight:600;line-height:1.65;margin:0 0 10px}.explanation{color:var(--muted);font-size:15px;line-height:1.9;margin:0}.source-row{display:flex;flex-wrap:wrap;gap:7px 15px;margin-top:18px}.source-row a{font-size:13px;color:#37638f;text-underline-offset:4px;text-decoration-color:#b7c9de;overflow-wrap:anywhere}.external-icon{font-size:12px}.detail-example{border-left:1px solid var(--line);padding-left:30px}.example-label{font-size:13px;font-weight:600;color:var(--muted);margin:0 0 9px}.detail-example>p:not(.example-label){font-size:16px;line-height:1.85;margin:0}.boundary{margin-top:18px;padding-top:14px;border-top:1px solid #e7edf4}.boundary strong{font-size:13px;color:#8c613d}.boundary p{font-size:14px;color:var(--muted);line-height:1.8;margin:5px 0 0}footer{padding:23px 0 30px;display:flex;justify-content:space-between;gap:15px;color:var(--muted);font-size:13px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:12px;top:-70px;background:white;padding:8px 15px;z-index:10}.skip-link:focus{top:12px}.noscript{color:#8c613d}@media(min-width:1350px){.scroll-hint{display:none}}@media(max-width:800px){.topbar,main,footer{width:calc(100% - 36px)}.topbar{height:66px}.edition{font-size:12px}.intro{padding-top:26px}.lead{font-size:16px}.reading-key{gap:16px;font-size:12px;flex-wrap:wrap}.section-bar{align-items:flex-start}.section-bar h2{font-size:15px}.scroll-hint{font-size:12px}.map-caption{flex-direction:column;gap:4px;font-size:12px}.map-caption>span{white-space:normal}.detail{grid-template-columns:1fr;gap:20px;padding:23px 22px;margin-top:21px}.detail-example{padding:20px 0 0;border-left:0;border-top:1px solid var(--line)}.detail-main h2{font-size:25px}.understanding{font-size:18px}footer{flex-direction:column;gap:4px;font-size:12px}.map-scroll{border-radius:10px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
:root .mobile-legend{display:none}@media(max-width:800px){:root .mobile-legend{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;margin:0 0 10px}.mobile-legend span:nth-child(1){color:var(--blue)}.mobile-legend span:nth-child(2){color:var(--purple)}.mobile-legend span:nth-child(3){color:var(--orange)}}