:root{--ink:#143f35;--muted:#536b60;--paper:#f8f4ea;--line:#cbd4c4;--gold:#946c30}*{box-sizing:border-box}html{scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font:18px/1.8 system-ui,"PingFang SC",sans-serif}header,main,footer{max-width:1060px;margin:auto;padding:28px 24px}header{padding-top:38px}a{color:var(--ink);text-underline-offset:5px;overflow-wrap:anywhere}nav{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:16px}nav a,.button{display:inline-flex;align-items:center;min-height:44px}h1,h2,h3{line-height:1.3}h1,h2{font-family:"Songti SC",serif}h1{font-size:clamp(36px,6vw,66px);margin:24px 0}h2{font-size:32px;margin:0 0 20px}h3{font-size:22px;margin:0 0 10px}p{margin:12px 0}.eyebrow{font-size:15px;letter-spacing:2px;color:var(--gold);margin-top:40px}.lead{font-size:22px;max-width:760px}.muted,figcaption{color:var(--muted)}section{margin-bottom:48px;scroll-margin:20px}.card{background:#fffdf7;border:1px solid var(--line);padding:26px;border-radius:12px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.steps{padding-left:25px}.steps li{padding:9px 0}.steps strong{display:block}.tag{font-size:14px;display:inline-block;color:var(--gold);border:1px solid var(--line);padding:2px 10px;border-radius:20px}.button,button{font:inherit;cursor:pointer;border:1px solid var(--ink);border-radius:8px;padding:8px 17px;background:var(--ink);color:#fffdf7;text-decoration:none}button{min-height:44px}a:focus-visible,button:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #b48239;outline-offset:4px}pre{white-space:pre-wrap;overflow-wrap:anywhere;font:16px/1.8 system-ui,"PingFang SC",sans-serif;background:#eef1e6;padding:20px;border-radius:8px;margin:16px 0}.status{font-size:15px;margin-left:10px}figure{margin:0}figure img{display:block;width:100%;max-width:400px;height:auto;margin:20px auto;border-radius:8px}figcaption{font-size:16px}blockquote{margin:20px 0;padding:16px 22px;border-left:3px solid #bb9355;background:#eef1e6}.note{border-left:3px solid #bb9355;padding-left:16px}details{margin:20px 0}summary{cursor:pointer;min-height:44px;font-weight:600}footer{border-top:1px solid var(--line);color:var(--muted);font-size:15px}.skip{position:absolute;top:-100px}.skip:focus{top:0;background:white;padding:12px}.source{font-size:16px}textarea{width:100%;font:inherit;min-height:160px;padding:12px}@media(max-width:600px){header,main,footer{padding:24px 18px}.grid{grid-template-columns:1fr}.card{padding:20px}h2{font-size:28px}.lead{font-size:20px}section{margin-bottom:36px}}@media print{button,nav,.skip{display:none}body{background:white}.card{break-inside:avoid}pre{background:white}a{color:inherit}}

.jump{margin-top:24px;justify-content:flex-start;gap:24px}.resource-group{border:1px solid var(--line);border-radius:10px;padding:16px 20px;background:#fffdf7}.resource-group summary{display:list-item;line-height:1.6;padding:4px 0}.resource-group .grid{margin-top:18px}.resource h3{margin-top:14px}.resource-check{margin-bottom:0}.resource-group .card{background:var(--paper)}@media(max-width:600px){.resource-group{padding:14px}.jump{gap:16px}}
.mindmap-preview img{max-width:none;background:#fffdf7;border:1px solid var(--line)}.map-actions{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.chapter-group{border-bottom:1px solid var(--line);padding:10px 0}.chapter-group .grid{margin:16px 0}#map-dialog{width:min(96vw,1500px);max-width:96vw;max-height:94vh;padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--paper);color:var(--ink)}#map-dialog::backdrop{background:#102e32aa}.map-toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.map-toolbar label{display:flex;align-items:center;gap:8px}.map-toolbar input{max-width:150px}.map-scroll{height:65vh;overflow:auto;overscroll-behavior:contain;border:1px solid var(--line);background:var(--paper)}.map-scroll img{display:block;height:auto;max-width:none}@media(max-width:600px){#map-dialog{padding:14px}.map-toolbar strong{width:100%}.map-toolbar input{max-width:100px}}

/* ===== 版本切换：少儿版 / 壮年版 ===== */
.ver-switch{margin-top:18px;justify-content:flex-start;gap:12px;border-bottom:0;padding-bottom:0}
.ver-switch a,.ver-switch span{display:inline-flex;align-items:center;min-height:40px;padding:6px 18px;border:1px solid var(--line);border-radius:999px;font-size:15px;text-decoration:none;background:#fffdf7;color:var(--ink)}
.ver-switch .ver-on{background:var(--ink);color:#fffdf7;border-color:var(--ink);font-weight:600}
.ver-switch a:hover{border-color:var(--gold);color:var(--gold)}

/* ===== 壮年版里的「少儿版」醒目入口 ===== */
.kids-entry{background:#fffdf7;border:1px solid var(--line);border-left:3px solid var(--gold);border-radius:10px;padding:16px 18px;display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.kids-entry .button{background:var(--ink);color:#fffdf7;border-color:var(--ink);margin:0 2px}
.kids-entry .button:hover{background:var(--gold);border-color:var(--gold);color:#fffdf7}

/* ===== 更新历史时间线 ===== */
.tl{list-style:none;margin:0;padding:0}
.tl>li{border-left:2px solid var(--line);padding:0 0 26px 22px;position:relative}
.tl>li:last-child{padding-bottom:0}
.tl>li::before{content:"";position:absolute;left:-7px;top:9px;width:12px;height:12px;border-radius:50%;background:var(--gold)}
.tl .when{font-size:15px;color:var(--gold);font-weight:700;letter-spacing:1px;margin:0}
.tl h3{margin:4px 0 8px;font-size:20px}
.tl ul{margin:8px 0 0;padding-left:20px}
.tl ul li{padding:4px 0}