:root{color-scheme:dark;--paper:#eef0dd;--muted:#a9c2bc;--accent:#eda576;--bg:#062b34}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--paper);font:16px/1.6 'PingFang SC','Microsoft YaHei',sans-serif;overflow:hidden}button,input,textarea{font:inherit}button{cursor:pointer;color:inherit;background:#113e45;border:1px solid #6b91824d;border-radius:4px;padding:8px 13px;transition:background .2s,transform .2s}button:hover,button:focus-visible{background:#285651;outline:1px solid #eac9a4}button.active,.primary{background:#bd7856!important;color:#fff9e9;border-color:#ecb081}button:disabled{opacity:.5}#world,#labels,#veil{position:fixed;inset:0}#labels{pointer-events:none;overflow:hidden}#world canvas{display:block;width:100%;height:100%}header{height:84px;position:fixed;inset:0 0 auto;display:flex;align-items:center;gap:25px;padding:14px 28px;background:linear-gradient(#062b34f0,#062b34a8);border-bottom:1px solid #83a99c30;z-index:4}.brand{display:flex;gap:12px;font:22px 'Songti SC',serif;white-space:nowrap;align-items:center}.brand small{display:block;font:11px/1.7 sans-serif;letter-spacing:2px;color:var(--muted)}.seal{border:1px solid #dba37e;color:#eacbb0;padding:6px;font-size:19px}.utilities{display:flex;gap:6px;margin-left:auto}.utilities button{font-size:12px;padding:6px 10px}nav{display:flex;gap:4px}nav button{font-size:14px;white-space:nowrap;background:transparent;border:0}#panel{position:fixed;left:26px;top:112px;bottom:144px;width:284px;overflow:auto;padding:0 18px 20px 0;background:linear-gradient(90deg,#062b34ef 83%,transparent);scrollbar-width:thin}#eyebrow,.overline{font-size:11px;letter-spacing:3px;color:#b6bda4}h1{font:36px/1.3 'Songti SC','SimSun',serif;letter-spacing:3px;margin:15px 0}#intro{font-size:14px;color:#b6ccc5;margin:0 0 23px}h2{font:28px 'Songti SC',serif}h3{font-size:17px;margin:12px 0}.line{border-top:1px solid #8db7a733;margin:18px 0;padding-top:14px}.meta{font-size:12px;color:#b6bda4;letter-spacing:2px}.question{font-size:16px;line-height:1.6;margin:13px 0}.choices{display:grid;gap:8px}.choices button{text-align:left;font-size:14px}.response{color:#ecd8aa;font-size:14px;margin-top:10px}.controls label{display:block;font-size:14px;margin-top:15px}input[type=range]{display:block;width:100%;accent-color:#efa774;margin:10px 0}output{color:#ffca91}.hint{font-size:12px;color:#a5bab5}.action{width:100%;text-align:left;margin-top:15px;padding:11px 15px;background:#b77555;color:white}.tabs{display:flex;gap:5px;flex-wrap:wrap}.tabs button{font-size:12px;padding:5px 9px}.metric{font:36px 'Songti SC',serif;color:#f6ce91;margin:10px 0}.pin{position:absolute;padding:4px 9px;background:#103b42eb;border:1px solid #bac8a880;color:#f2f0d8;pointer-events:auto;font-size:12px;white-space:nowrap;transform:translate(-50%,-115%);box-shadow:0 3px 10px #0003}.pin.selected{background:#c9805b;color:white}.geo-label{position:absolute;transform:translate(-50%,-50%);font-size:13px;color:#e9e5c8;text-shadow:0 2px 4px #000;letter-spacing:2px;white-space:nowrap}#mapTools{position:fixed;right:26px;top:113px;display:grid;gap:6px}#mapTools button{font-size:12px;background:#103e42d0}#legend{position:fixed;left:335px;bottom:151px;font-size:11px;width:230px;pointer-events:none}#legend b{font-weight:400}.ramp{display:block;height:6px;background:linear-gradient(90deg,#69ac91,#bbb889,#b39060,#a78564,#e2e7dc);margin:8px 0}#legend small{display:block;opacity:.6;font-size:10px}#tip{position:fixed;bottom:141px;right:27px;font-size:11px;color:#b4c9bd}#views{position:fixed;bottom:174px;left:50%;transform:translateX(-30%);display:flex;gap:7px}#views button{font-size:13px;background:#103e42de}footer{position:fixed;bottom:0;left:0;right:0;background:linear-gradient(transparent,#062b34f5 14%);padding:23px 28px 12px;z-index:3}#timeline{display:flex;justify-content:space-between;border-top:1px solid #90a89570;padding-top:12px;gap:8px}#timeline button{flex:1;background:transparent;border:0;color:#b3c7bf;font-size:13px;padding:0 8px}#timeline button small{display:block;color:#8aa79e;font-size:10px}#timeline button:before{content:'◇';display:block;margin-top:-23px;margin-bottom:5px;background:#062b34;width:32px;margin-left:auto;margin-right:auto}#timeline button.active{color:#ffcd91;background:transparent!important}#timeline button.active:before{color:#ffad75;content:'◆'}.footerLine{display:flex;align-items:center;gap:18px;margin-top:9px;font-size:10px;color:#8ba79d}.footerLine button{font-size:11px;padding:3px 10px}.footerLine button:first-of-type{margin-left:auto}#feedback{position:fixed;left:50%;top:96px;transform:translateX(-25%);padding:10px 20px;background:#edc99bec;color:#203c37;border-radius:3px;opacity:0;pointer-events:none;transition:opacity .3s;max-width:600px;font-size:14px}#feedback.show{opacity:1}#veil{background:#b7c1a9;opacity:0;pointer-events:none;z-index:2}#veil.flash{animation:fade .8s}@keyframes fade{0%,100%{opacity:0}35%{opacity:.35}}#start{position:fixed;inset:0;z-index:10;background:linear-gradient(90deg,#052b35f8 0%,#082e36b8 44%,#04222b38 100%);display:flex;align-items:center;padding:8vw}#start>div{max-width:530px}#start h1{font-size:64px;margin:23px 0}#start p{color:#c1d1c5;font-size:18px}#enter{background:#bf7c56;padding:14px 35px;margin:20px 0;font-size:20px}#loading{display:block;color:#a6beb5}dialog{border:1px solid #648c7d;background:#0c353c;color:#e3ecdc;width:min(700px,90vw);max-height:85vh;padding:30px}dialog::backdrop{background:#001b24c9}.close{float:right}textarea{width:100%;background:#0c3036;color:#f2edd8;border:1px solid #537b6e;min-height:85px;padding:10px}#recordList article{border-top:1px solid #517d7050;padding:10px 0}a{color:#f6cc98}.step-row{display:flex;align-items:center;justify-content:space-between;background:#ffffff08;margin:6px 0;padding:8px;font-size:14px}.step-row button{padding:2px 9px}.chip{font-size:11px;border:1px solid #97b0a14d;padding:3px 7px;color:#eac79e}.reduced *{scroll-behavior:auto!important}#error{position:fixed;inset:120px 20%;padding:30px;background:#183e40;z-index:30}@media(max-width:1050px){header{gap:12px;padding:12px 16px}.brand{font-size:18px}.brand small{font-size:9px}nav button{font-size:12px;padding:6px}.utilities button{padding:5px;font-size:10px}#panel{width:252px;left:18px;font-size:14px}#legend{left:290px}#timeline button{font-size:12px}}@media(max-width:720px){header{height:100px;flex-wrap:wrap;gap:5px}.brand{font-size:17px}nav{order:3;width:100%;justify-content:center}#panel{top:114px;width:210px;bottom:128px;padding-right:8px}#panel h1{font-size:26px}#intro{font-size:12px}#content{font-size:12px}.question{font-size:13px}.choices button{font-size:12px}#mapTools{right:9px;top:115px}#legend{display:none}#timeline{overflow:auto}#timeline button{min-width:80px}.footerLine #status{display:none}#tip{display:none}#views{bottom:137px;left:220px;transform:none;max-width:calc(100vw - 230px);flex-wrap:wrap}#views button{font-size:10px;padding:4px}#start h1{font-size:44px}.pin{font-size:10px}#feedback{max-width:85vw;transform:translateX(-50%);top:104px;width:85vw}}

.mountain-label{font-size:12px;color:#ffe2a9;background:#082f36de;border-bottom:1px solid #efb26d;padding:2px 6px;letter-spacing:1px}#mapTools{max-height:65vh;overflow:auto}.mountain-label:before{content:"▲ ";font-size:9px}
/* V5: quiet geographic canvas; legible labels; local scenes own the screen. */
:root{color-scheme:light;--paper:#213c40;--muted:#557273;--accent:#aa5338;--bg:#b7cbd0}body{color:#213c40;background:#b7cbd0}button{color:#284e52;background:#f4f4ecde;border:1px solid #a1b8b466;border-radius:7px}button:hover,button:focus-visible{background:#ffffff;outline:2px solid #477c7b66}button.active,.primary{background:#9e523b!important;border-color:#b97c62;color:#fff9ee}header{height:77px;background:linear-gradient(#f9f7efed,#eff3edf2);border-bottom:1px solid #779da244;gap:16px;padding:12px 23px;backdrop-filter:blur(18px)}.brand{font-size:23px}.brand small{color:#526e70}.seal{border-color:#a75f42;color:#994f39}nav button{font-size:13px;padding:7px 9px}nav{gap:1px}.utilities{gap:4px}.utilities button{color:#355c61}#panel{left:22px;top:138px;bottom:148px;width:290px;background:#f7f6edeb;border:1px solid #8aaba43d;border-radius:14px;padding:21px 19px;box-shadow:0 14px 50px #28454b15;backdrop-filter:blur(15px);transition:transform .45s,opacity .35s}#panel h1{font-size:32px;line-height:1.3;letter-spacing:1px;margin:12px 0 15px}#eyebrow,.meta{color:#8c583c;letter-spacing:1px}#intro{color:#52706e;font-size:14px;margin-bottom:16px}.hint{color:#55716e;font-size:12px}.response{color:#854932}.metric,output{color:#9c5231}.line{border-color:#8ea99a55}.choices button{background:#ffffffa8}.choices button:hover{background:#dce8dc}.step-row{background:#d9e3d766}.action{background:#9e563f;color:#fff8ef}.action:hover{background:#b17058}#panelToggle{position:fixed;left:22px;top:94px;z-index:5;font-size:12px;padding:7px 13px;background:#f9f8efeb}.panel-collapsed #panel{transform:translateX(-335px);opacity:0;pointer-events:none}#layerDock{position:fixed;right:22px;top:94px;z-index:5;min-width:133px}#layerButton{width:100%;background:#f9f8efef;font-size:13px;padding:8px 13px}#layerChoices{display:none;background:#f7f6edf2;border:1px solid #9eb4ad88;border-radius:10px;padding:10px 14px;margin-top:7px;box-shadow:0 10px 30px #183a3d20}.open #layerChoices{display:grid;gap:9px}#layerChoices label{display:flex;align-items:center;gap:9px;font-size:13px;color:#27484c;cursor:pointer}#layerChoices input{width:16px;height:16px;accent-color:#9f533b}#mapTools{right:22px;top:147px;gap:7px;transition:opacity .3s}#layerDock.open~#mapTools{opacity:0;pointer-events:none}#mapTools button{background:#f7f7f0db;color:#345d61;font-size:12px;border:1px solid #97b1ac66;box-shadow:0 3px 12px #2d525615}#legend{left:337px;bottom:153px;color:#1b424a;background:#f8f7ecdc;padding:10px 13px;border-radius:8px;width:260px}#legend small{color:#385d63;opacity:1}#tip{color:#2d565b;background:#f8f7ecc7;border-radius:5px;padding:3px 8px;font-size:11px}footer{background:linear-gradient(transparent,#edf2ebeb 22%,#eff2ecfa);color:#2a555c;padding-top:30px}#timeline{border-color:#78989399}#timeline button{color:#355962;font-weight:600}#timeline button small{color:#536f73}#timeline button:before{background:#ebf0e9;color:#6f8d8b}#timeline button.active{color:#993d2a}#timeline button.active:before{color:#a44931}.footerLine{color:#45676b}.footerLine button{background:#f6f5eddd;color:#325659}#feedback{background:#263f42ee;color:#fff9e9;z-index:12;box-shadow:0 8px 30px #17343822;border-radius:7px}.geo-label{font-size:15px;font-weight:650;color:#183d43;text-shadow:0 1px #fff,1px 0 #fffff3,-1px 0 #fffff3,0 -1px #fffff3;letter-spacing:1px;background:#f9f5e2a8;padding:2px 5px;border-radius:3px}.mountain-label{font-size:12px;color:#734026;background:#fff7e4ed;border:1px solid #bb997188;text-shadow:none;font-weight:650;padding:3px 7px}.pin{font-size:12px;color:#6b3324;background:#fff4e8ed;border:1px solid #ae6a4d99;border-radius:5px;font-weight:600;box-shadow:0 3px 12px #40211120}.pin.selected{background:#984d38;border-color:#b46545;color:#fff6e8}.energy-label{background:#fff0d9e8;color:#7e3d25;border-bottom:2px solid #ac673c}.shipping-label{background:#e6f5faed;color:#145776;border-bottom:2px solid #3486a3}#views{bottom:166px;left:50%;transform:translateX(-50%);max-width:85vw;flex-wrap:wrap;justify-content:center}#views button{background:#f8f5e9ef;color:#305156;border:1px solid #d8dfd1;font-size:13px;padding:10px 17px;box-shadow:0 5px 15px #122b3c22}#walkTour{background:#824830!important;color:#fff7e8!important}#sceneRibbon{position:fixed;left:25px;bottom:238px;pointer-events:none;color:#fff9e9;text-shadow:0 2px 8px #152124c9;max-width:540px}#sceneName{display:block;font:34px 'Songti SC',serif;letter-spacing:3px}#sceneTask{display:block;margin-top:10px;font-size:15px;line-height:1.65;background:#182e324d;padding:5px 9px;border-radius:4px}.local-scene header{background:linear-gradient(#102a32bf,#152d3430);border:0;color:#fff9e9}.local-scene header .brand small{color:#e1e8d7}.local-scene header nav button{color:#fff9ed}.local-scene .utilities button{color:#f6f5e5;background:#25474d7d}.local-scene #layerDock{display:none}.local-scene #mapTools{display:none}.local-scene footer{background:linear-gradient(transparent,#122a33c9 30%,#10242deb);color:#edeedc}.local-scene #timeline button{color:#dde9df}.local-scene #timeline button small{color:#bdcec9}.local-scene #timeline button:before{background:#233c3f}.local-scene #timeline button.active{color:#ffc59d}.local-scene .footerLine{color:#d1ddd5}.local-scene .footerLine button{background:#173940b8;color:#e7ebdb}.local-scene #tip{color:#f5f5e6;background:#1e3b4266}#veil{background:#b6c7c2;z-index:7}#veil.flash{animation:sceneFade 1.2s ease-in-out}@keyframes sceneFade{0%,100%{opacity:0}35%{opacity:.86}60%{opacity:.38}}#start{background:linear-gradient(90deg,#eaf0e9f7 0%,#ecf0e4c9 43%,#b5cbd012 100%);color:#243d3f}#start .overline{color:#926048}#start p{color:#49686b}#loading{color:#46666d}#enter{color:#fff6e9;background:#9d553d;border-color:#b97b5f;border-radius:7px}dialog{background:#f4f3e9;color:#2e5054;border:1px solid #99b3aa;border-radius:12px}dialog a{color:#7c422e}dialog textarea{background:#fffdf4;color:#24454b;border-color:#9cb2a7}#recordList article{border-color:#99b1a777}.reduced #veil.flash{animation:none}.reduced #panel{transition:none}#classClock{top:95px;right:170px}body:has(.dem-profile:not([hidden])) #classClock{right:22px;top:94px}
@media(max-width:1200px){.brand{font-size:19px}.brand small{font-size:9px}header{gap:9px;padding:10px 15px}nav button{font-size:12px;padding:6px}.utilities button{font-size:10px;padding:6px}#panel{width:265px}#legend{left:305px}.geo-label{font-size:13px}}
@media(max-width:800px){header{height:105px;flex-wrap:wrap}.utilities{margin-left:auto}nav{order:3;width:100%;justify-content:center}#panelToggle,#layerDock{top:116px}#panel{top:157px;width:230px;bottom:150px;padding:15px}#panel h1{font-size:26px}#mapTools{top:165px}#legend{display:none}#sceneRibbon{left:18px;bottom:252px;max-width:70vw}#sceneName{font-size:28px}#sceneTask{font-size:12px}#views{bottom:148px;max-width:94vw;width:94vw}#views button{font-size:11px;padding:8px 10px}#timeline button{min-width:74px}#classClock{top:153px;right:10px}.geo-label{font-size:12px}}
#panel .river-lab .rl-metric{color:#9a4b2e}#panel .river-lab .rl-answer{color:#426a4d}#panel .river-lab svg text{fill:#385b60}#panel .river-lab svg{background:#eaf0e6;border-radius:8px}#panel .river-lab .rl-ports{font-size:14px}#panel .river-lab button{font-size:13px}#panel .river-lab input{accent-color:#a35a38}
.pin{transform:translate(-50%,-50%)}
#rainLegend{position:fixed;bottom:234px;left:337px;background:#f8f7edeb;color:#254b52;padding:10px 13px;border-radius:8px;font-size:11px;width:260px}#rainLegend b{display:block}#rainLegend span{display:block;height:6px;margin:7px 0;background:linear-gradient(90deg,#dcb779,#237ca8)}@media(max-width:800px){#rainLegend{left:22px;bottom:157px;width:220px}}

/* Textbook-inspired elevation colors: east green, middle ochre, west violet. */
.ramp{height:10px;border-radius:3px;background:linear-gradient(90deg,#357f58 0%,#478e61 6%,#57966b 9%,#a78e5b 13%,#bc9863 29%,#aa8467 41%,#796977 50%,#746987 65%,#968aa2 77%,#d9d4d4 100%);border:1px solid #314b4970}
.geo-label{color:#fff3d2;text-shadow:0 1px 3px #072b30,0 2px 8px #072b30,0 0 2px #072b30;font-weight:600}
#back[hidden]{display:none!important}