@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{font-family:'DM Sans',Arial,sans-serif;color:#182629;background:#dfe5e5;font-size:16px;font-synthesis:none;--ink:#182629;--accent:#d8ed9c;--muted:#677575}*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;border:0;color:inherit}button:focus-visible,a:focus-visible{outline:3px solid #789c36;outline-offset:4px}button{transition:background .18s,transform .18s}button:hover{filter:brightness(.96)}button:active{transform:translateY(1px)}[hidden]{display:none!important}#app{height:100dvh;min-height:650px;position:relative;overflow:hidden}#viewport{position:absolute;inset:0}canvas{display:block;width:100%;height:100%;touch-action:none}.masthead{position:absolute;top:0;left:0;right:0;height:108px;padding:28px 40px;display:flex;justify-content:space-between;align-items:center;pointer-events:none}.masthead>*{pointer-events:auto}.brand{display:flex;gap:14px;align-items:center;text-decoration:none;color:var(--ink);font:800 23px Manrope,sans-serif;letter-spacing:2px}.brand-mark{display:grid;place-items:center;border:1.5px solid var(--ink);height:49px;width:49px;font-size:23px;letter-spacing:-2px}.brand-sub{display:block;font:600 10px 'DM Sans',sans-serif;letter-spacing:2px;margin-top:6px}.quiet{background:#ffffffb8;border:1px solid #ffffffb0;backdrop-filter:blur(10px);padding:13px 18px;border-radius:25px;font-size:14px}.quiet span{margin-left:24px}.panel{position:absolute;left:40px;top:138px;width:326px;padding:28px;background:#fbfcf8f2;border:1px solid #ffffffd0;border-radius:3px;box-shadow:0 16px 45px #1220260a;backdrop-filter:blur(20px)}.eyebrow{font-size:11px;font-weight:700;letter-spacing:2px;color:#52615e}h1{font:500 37px/1.18 Manrope,sans-serif;letter-spacing:-1.7px;margin:18px 0 14px}.intro{font-size:14px;line-height:1.5;color:var(--muted);margin:0 0 28px}.unit-picker{display:flex;gap:8px;margin-bottom:23px}.unit-picker button{height:43px;width:54px;border:1px solid #dfe5dc;border-radius:3px;background:transparent;font-size:14px}.unit-picker button.active{background:var(--ink);border-color:var(--ink);color:#fff}.unit-title{display:flex;justify-content:space-between;align-items:center;gap:10px}.unit-title h2{font:700 21px Manrope,sans-serif;margin:0}.unit-title>span{font-size:11px;color:var(--muted)}.details{font-size:13px;line-height:1.7;color:var(--muted);margin:9px 0 21px}.primary{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;padding:17px 16px;background:var(--accent);border-radius:3px;font-size:14px;font-weight:700}.primary span{font-size:21px;font-weight:400}.view-buttons{display:flex;gap:3px;margin-top:14px;border:1px solid #dfe5dc;border-radius:4px;padding:3px}.view-buttons button{flex:1;white-space:nowrap;padding:9px 2px;font-size:12px;background:transparent;border-radius:2px}.view-buttons .active{background:#e7ece2}.panel-bottom{display:flex;gap:10px;margin-top:25px;padding-top:22px;border-top:1px solid #e2e7dd;font-size:12px;line-height:1.65;color:#52615e}.panel-bottom small{font-size:11px;color:#7a8580}.swatch{width:8px;height:8px;flex-shrink:0;background:#9caa77;margin-top:6px;border-radius:50%}.scene-heading{position:absolute;left:410px;top:138px;display:flex;flex-direction:column;gap:10px;pointer-events:none;text-shadow:0 1px 10px #ffffffc0}.scene-heading>span:first-child{font-size:11px;font-weight:700;letter-spacing:2px}.scene-heading>span:last-child{font-size:14px;color:#465654}.utility{position:absolute;right:32px;top:45%;display:flex;flex-direction:column;gap:10px}.utility button{width:44px;height:44px;border-radius:50%;background:#ffffffe0;font-size:24px;box-shadow:0 4px 20px #11212e0b}.bottom-bar{position:absolute;bottom:26px;left:40px;right:40px;display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:12px;color:#425350}.bottom-bar>span{background:#ffffffbd;border-radius:25px;padding:12px 18px;backdrop-filter:blur(10px)}.bottom-bar button{font-size:12px;background:none;border-bottom:1px solid #697570;padding:4px 0}.room-title{margin:20px 0 10px}#room-buttons{display:flex;flex-wrap:wrap;gap:6px}#room-buttons button{font-size:12px;border:1px solid #d8dfd5;padding:7px 9px;background:transparent;border-radius:20px}#room-buttons button.active{background:var(--ink);color:white}.panel.walking h1,.panel.walking .intro,.panel.walking .panel-bottom,.panel.walking #enter{display:none}.panel.walking .unit-picker{margin-top:18px}#walk-bar{position:absolute;left:50%;bottom:80px;transform:translateX(-35%);display:flex;gap:28px;align-items:center;padding:12px 16px;background:#fbfcf8eb;border:1px solid #fff;border-radius:5px;backdrop-filter:blur(14px)}#walk-bar small{font-size:9px;letter-spacing:2px;color:#697570;display:block;margin-bottom:4px}#walk-bar strong{font-size:15px;white-space:nowrap}#walk-bar button{font-size:13px;white-space:nowrap;background:none;padding:12px 6px}#move-controls{position:absolute;bottom:140px;right:35px;text-align:center}#move-controls button{width:44px;height:44px;background:#fff9;margin:3px;border-radius:5px;font-size:21px;touch-action:none}#loading{position:absolute;inset:0;background:#e5eae6;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:22px;color:#5b6864;font-size:14px;transition:opacity .6s}.loading-mark{font:500 64px Manrope,sans-serif;letter-spacing:-7px;color:var(--ink)}#fade{position:absolute;inset:0;background:#ecf0ed;opacity:0;pointer-events:none;transition:opacity .18s}#toast{position:absolute;bottom:90px;left:50%;transform:translateX(-50%);background:#182629ed;color:white;font-size:14px;border-radius:5px;padding:12px 22px;opacity:0;pointer-events:none}dialog{border:none;border-radius:8px;padding:42px;max-width:720px;width:calc(100% - 32px);max-height:88dvh;color:var(--ink);background:#fbfcf8;box-shadow:0 30px 120px #0003}dialog::backdrop{background:#17232688;backdrop-filter:blur(8px)}dialog h2{font:500 32px/1.25 Manrope,sans-serif;letter-spacing:-1px;margin:18px 0 22px}dialog p{line-height:1.7;color:#53625d}dialog .close{position:absolute;right:18px;top:12px;background:none;font-size:30px}dl{display:grid;grid-template-columns:120px 1fr;gap:18px;font-size:14px;line-height:1.6;margin:28px 0}dt{font-weight:700}dd{margin:0;color:#53625d}.note{font-size:12px}.reference-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}figure{margin:0}figure img{width:100%;height:210px;object-fit:cover;border-radius:3px}figure:nth-child(3) img,figure:nth-child(4) img{object-fit:contain;background:white}figcaption{font-size:12px;margin-top:9px;color:#53625d}#reference-dialog{max-width:1050px}
@media(min-width:1500px){.panel{top:160px;left:52px;width:350px;padding:32px}.scene-heading{left:455px;top:160px}.masthead{padding:28px 52px}h1{font-size:40px}}
@media(max-height:800px) and (min-width:761px){.panel{top:112px;padding:22px}.intro{margin-bottom:18px}h1{font-size:30px;margin-top:13px}.panel-bottom{margin-top:16px;padding-top:14px}.unit-picker{margin-bottom:16px}.scene-heading{top:112px}.masthead{height:90px}.panel.walking{max-height:calc(100dvh - 180px);overflow:auto}}
@media(max-width:760px){#app{min-height:600px}.masthead{padding:18px 20px;height:82px}.brand{font-size:18px;gap:10px}.brand-mark{width:38px;height:38px;font-size:20px}.brand-sub{font-size:8px;letter-spacing:1.2px}.quiet{font-size:12px;padding:10px 12px}.quiet span{margin-left:7px}.panel{left:16px;right:16px;top:auto;bottom:65px;width:auto;padding:17px 18px}.panel h1,.panel .intro,.panel .eyebrow,.panel-bottom{display:none}.unit-picker{margin:0 0 13px;gap:6px;position:absolute;right:18px;top:15px}.unit-picker button{width:35px;height:33px;font-size:12px}.unit-title{justify-content:flex-start;gap:8px;margin-bottom:3px}.unit-title h2{font-size:18px}.unit-title>span{display:none}.details{font-size:11px;margin:10px 0 15px}.primary{padding:11px 14px}.view-buttons{margin-top:10px}.scene-heading{left:22px;top:101px;gap:7px}.scene-heading>span:last-child{font-size:12px}.utility{right:17px;top:160px;gap:7px}.utility button{height:36px;width:36px;font-size:22px}.bottom-bar{left:18px;right:18px;bottom:20px;font-size:10px}.bottom-bar>span{padding:7px 9px;font-size:10px;max-width:65%}.bottom-bar button{font-size:10px}.panel.walking{bottom:auto;top:145px;left:16px;right:auto;width:210px;padding:14px;background:#fbfcf8ed}.panel.walking .unit-picker{position:static;margin-top:0}.panel.walking .unit-title,.panel.walking .details,.panel.walking .view-buttons{display:none}.panel.walking #rooms{margin-top:8px}.panel.walking #room-buttons{gap:4px}.panel.walking #room-buttons button{font-size:11px;padding:6px 8px}#walk-bar{left:16px;right:16px;bottom:75px;transform:none;padding:8px;gap:10px;justify-content:space-between}#walk-bar button{font-size:12px}#walk-bar strong{font-size:13px}#move-controls{right:17px;bottom:156px}dialog{padding:28px 22px}dialog h2{font-size:26px}dl{grid-template-columns:1fr;gap:5px}dd{margin-bottom:12px}.reference-grid{grid-template-columns:1fr}figure img{height:auto;max-height:360px}#toast{width:90%;text-align:center}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}

/* Language selection stays available in both exterior and phone walkthrough views. */
.header-actions{display:flex;align-items:center;gap:12px}
.quiet .reference-label{margin-left:0}
[data-language]{font:inherit;font-size:14px;min-height:44px;padding:10px 12px;border:1px solid #ffffffd0;border-radius:25px;background:#fbfcf8f2;color:var(--ink);cursor:pointer;pointer-events:auto;max-width:125px}
[data-language]:focus-visible{outline:3px solid #789c36;outline-offset:3px}
html[lang="zh-CN"]{font-family:'DM Sans','Microsoft YaHei','PingFang SC',sans-serif}
html[lang="zh-CN"] h1,html[lang="zh-CN"] h2{font-family:Manrope,'Microsoft YaHei','PingFang SC',sans-serif;letter-spacing:0}
html[lang="zh-CN"] .eyebrow,html[lang="zh-CN"] .scene-heading>span:first-child,html[lang="zh-CN"] #walk-bar small{letter-spacing:1px}
@media(max-width:760px){
 .header-actions{gap:8px}.header-actions #references{width:44px;height:44px;padding:0}.header-actions #references span{margin:0}.header-actions #references .reference-label{display:none}
 .header-actions [data-language]{max-width:106px;padding:10px 7px}.brand-sub{letter-spacing:.4px}
}
@media(max-width:380px){.masthead{padding-left:14px;padding-right:14px}.brand{font-size:16px;letter-spacing:1px;gap:7px}.brand-sub{display:none}}

.panel{max-height:calc(100dvh - 215px);overflow:auto} @media(max-width:760px){.panel{max-height:calc(100dvh - 225px)}.details{font-size:13px}.unit-picker button{font-size:14px}.panel.walking #room-buttons button{font-size:13px}.bottom-bar button{color:#253831;background:#ffffffe0;padding:7px;border-radius:15px}.panel.walking{width:220px}}

/* Phone walkthrough: the scene stays open, with navigation within thumb reach. */
#mobile-walk-header,#mobile-walk-bar{display:none}
#room-sheet{position:fixed;inset:auto 0 0;margin:0 auto;width:min(100%,560px);max-width:560px;max-height:85dvh;border-radius:24px 24px 0 0;padding:18px 22px max(24px,env(safe-area-inset-bottom));overscroll-behavior:contain}
#room-sheet::backdrop{background:#17232670;backdrop-filter:blur(3px)}
.sheet-handle{width:36px;height:4px;border-radius:4px;background:#c4cec6;margin:0 auto 24px}
#room-sheet .close{width:44px;height:44px;right:10px;top:16px}
#room-sheet h2{font-size:24px;margin:0 34px 20px 0}
.sheet-units{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.sheet-units button{min-height:46px;border:1px solid #d4ddd1;background:transparent;border-radius:7px;font-size:14px}
.sheet-units button.active{background:var(--ink);color:#fff;border-color:var(--ink)}
#sheet-current{font-size:14px;margin:18px 0 12px}
#sheet-room-buttons{display:grid;grid-template-columns:1fr 1fr;gap:8px}
#sheet-room-buttons button{min-height:50px;padding:12px;text-align:left;background:#edf1e8;border-radius:8px;font-size:15px;border:1px solid transparent}
#sheet-room-buttons button[aria-current="location"]{background:var(--accent);border-color:#9cb85c}
#sheet-exterior{width:100%;background:transparent;text-align:left;font-size:14px;min-height:48px;margin-top:15px;border-top:1px solid #dbe2d6}
@media(max-width:760px),(max-height:500px) and (max-width:1000px){
 #app{min-height:0;height:100dvh}
 #app.is-walking .panel,#app.is-walking .masthead,#app.is-walking .scene-heading,#app.is-walking .utility,#app.is-walking #walk-bar,#app.is-walking #move-controls,#app.is-walking #about{display:none}
 #mobile-walk-header{position:absolute;top:calc(12px + env(safe-area-inset-top));left:max(16px,env(safe-area-inset-left));right:max(16px,env(safe-area-inset-right));display:flex;justify-content:space-between;align-items:center;gap:12px;pointer-events:none}
 #mobile-walk-header button,#mobile-unit-name{background:#fbfcf8f2;border:1px solid #fff;border-radius:25px;padding:12px 16px;font-size:14px;box-shadow:0 4px 24px #13231b14;backdrop-filter:blur(12px)}
 #mobile-walk-header button{min-height:46px;pointer-events:auto}
 #mobile-unit-name{font-weight:600}
 #mobile-walk-header{gap:6px}
 #mobile-walk-header button,#mobile-unit-name{padding:12px 10px;white-space:nowrap}
 #mobile-walk-header [data-language]{max-width:106px;font-size:14px;padding:10px 7px;flex-shrink:0}
 #mobile-unit-name{font-size:13px;padding:12px 8px}
 #mobile-walk-bar{display:block;position:absolute;bottom:calc(12px + env(safe-area-inset-bottom));left:max(12px,env(safe-area-inset-left));right:max(12px,env(safe-area-inset-right));max-width:460px;margin:0 auto;padding:12px;background:#fbfcf8f5;border:1px solid #fff;border-radius:18px;box-shadow:0 8px 35px #14211e24;backdrop-filter:blur(18px)}
 .mobile-room-status{display:flex;align-items:center;justify-content:space-between;padding:0 7px 10px;gap:12px}
 #mobile-room-name{font-size:16px;font-weight:600}
 #room-count{font-size:12px;color:#52615e}
 .mobile-walk-actions{display:grid;grid-template-columns:1fr 1.2fr 1fr;gap:6px}
 .mobile-walk-actions button{min-height:48px;border-radius:9px;font-size:14px;background:#e8eee1;touch-action:manipulation}
 .mobile-walk-actions #open-rooms{background:var(--ink);color:#fff;font-weight:600}
 #open-rooms span{margin-left:8px;color:var(--accent)}
 #app.is-walking .bottom-bar{bottom:calc(125px + env(safe-area-inset-bottom));left:0;right:0;justify-content:center;pointer-events:none}
 #app.is-walking #hint{max-width:calc(100% - 32px);font-size:12px;padding:8px 12px;background:#fbfcf8e8;color:#273c36}
 #app.is-walking #toast{bottom:calc(170px + env(safe-area-inset-bottom));font-size:14px}
 .unit-picker button{min-width:38px;min-height:44px}
 .panel .unit-title{min-height:44px}
 .panel .view-buttons button{min-height:44px;font-size:13px}
}
@media(max-height:500px) and (max-width:1000px){
 #mobile-walk-bar{left:auto;width:350px;right:max(12px,env(safe-area-inset-right));padding:8px}
 #app.is-walking .bottom-bar{right:auto;left:max(12px,env(safe-area-inset-left));bottom:18px}
 #app.is-walking #hint{max-width:300px}
 #room-sheet{max-height:94dvh}
 #sheet-room-buttons{grid-template-columns:repeat(3,1fr)}
 #app:not(.is-walking) .panel{left:16px;top:86px;bottom:16px;width:300px;padding:14px;max-height:calc(100dvh - 102px)}
 #app:not(.is-walking) .panel.collapsed{bottom:auto;padding:6px 14px}
 #app:not(.is-walking) .panel h1,#app:not(.is-walking) .panel .intro,#app:not(.is-walking) .panel .eyebrow,#app:not(.is-walking) .panel-bottom{display:none}
 #app:not(.is-walking) .unit-picker{position:static;margin:0 0 8px;gap:6px}
 #app:not(.is-walking) .unit-title{min-height:0}
 #app:not(.is-walking) .details{font-size:12px;margin:8px 0}
 #app:not(.is-walking) .primary{min-height:44px;padding:9px 12px}
 #app:not(.is-walking) .view-buttons{margin-top:8px}
 #app:not(.is-walking) .scene-heading{left:340px;top:88px}
 #app:not(.is-walking) .masthead{height:76px;padding:12px 20px}
 #app:not(.is-walking) .bottom-bar{left:340px;right:16px;bottom:16px}
 #app:not(.is-walking) .bottom-bar #hint{display:none}
 #app:not(.is-walking) .utility{top:130px;right:16px}
}

/* Compact controls leave the model visible; hidden content leaves the tab order. */
#panel-toggle{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;min-height:44px;margin:0 0 14px;padding:8px 0;background:transparent;font-size:14px;text-align:left}
.control-chevron{display:block;flex-shrink:0;width:18px;height:18px;transition:transform .18s ease}
[aria-expanded="true"]>.control-chevron{transform:rotate(180deg)}
#open-rooms{display:flex;align-items:center;justify-content:center;gap:8px}
#open-rooms .control-chevron{color:var(--accent)}
@media(prefers-reduced-motion:reduce){.control-chevron{transition:none}}
.panel.collapsed{padding:8px 16px;overflow:visible}
.panel.collapsed #panel-toggle{margin:0}
#walk-controls-toggle{display:flex;align-items:center;gap:8px;min-height:44px;background:transparent;font-size:13px;padding:6px 0 6px 8px;white-space:nowrap}
.mobile-room-status{gap:8px}
.mobile-room-status #room-count{margin-left:auto}
#mobile-walk-bar.collapsed .mobile-room-status{padding-bottom:0}
@media(max-width:760px){
 #panel-content{position:relative}
 .panel #panel-content .unit-picker{top:0;right:0}
 .panel #panel-toggle{margin-bottom:10px;min-height:36px}
 .panel.collapsed #panel-toggle{margin:0;min-height:44px}
 .panel.collapsed{padding:6px 14px}
}
@media(max-width:760px),(max-height:500px) and (max-width:1000px){
 #app.is-walking .bottom-bar{display:none}
 #mobile-walk-bar.collapsed{padding:6px 12px}
 #mobile-room-name{font-size:14px}
}
@media(max-width:760px) and (min-height:501px) and (max-height:650px){
 .utility{flex-direction:row;top:150px}
}