:root{color-scheme:dark;--ink:#f4f2ed;--muted:#a3abbc;--accent:#e7bf92;--border:rgba(186,199,224,.18);font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;font-synthesis:none}*{box-sizing:border-box}body{margin:0;background:#03050c;color:var(--ink);overflow:hidden}button,input{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}button:focus-visible,input:focus-visible,canvas:focus-visible{outline:2px solid var(--accent);outline-offset:5px}button{border:0}button:disabled{opacity:.5;cursor:default}[hidden]{display:none!important}#universe{position:relative;width:100%;height:100svh;min-height:440px;overflow:hidden}#space{width:100%;height:100%;display:block;touch-action:none;outline:none;cursor:grab}#space.dragging{cursor:grabbing}.vignette{position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(3,5,12,.5),transparent 23%,transparent 50%,rgba(3,5,12,.35) 75%,rgba(3,5,12,.93)),linear-gradient(90deg,rgba(3,5,12,.18),transparent 50%)}.interface{transition:opacity .45s ease}.topbar{position:absolute;left:42px;right:42px;top:30px;display:flex;justify-content:space-between;align-items:center;gap:20px}.brand{display:flex;gap:14px;align-items:center}.brand svg{width:43px;fill:none;stroke:var(--accent);stroke-width:1.25}.brand strong{display:block;font-size:22px;font-weight:500;letter-spacing:.34em;line-height:1.4}.brand span{display:block;font-size:10px;letter-spacing:.22em;color:#b9becb;margin-top:4px}.top-actions{display:flex;gap:20px;align-items:center}.mode-label{font-size:13px;letter-spacing:.13em;color:#bcc3d2;display:flex;align-items:center;gap:14px}.mode-line{display:block;width:27px;height:1px;background:var(--accent)}.glass{background:rgba(12,17,29,.52);border:1px solid var(--border);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px)}.sound-button{border-radius:28px;padding:12px 19px;display:flex;gap:11px;align-items:center;font-size:14px;min-height:44px}.sound-button:hover,.glass:hover{border-color:rgba(231,191,146,.45)}.wave{display:flex;align-items:center;gap:3px;height:17px}.wave i{height:4px;width:2px;background:#abb3c6;border-radius:2px}.wave i:nth-child(2){height:13px}.wave i:nth-child(3){height:9px}.wave i:nth-child(4){height:16px}.sound-button.playing .wave i{background:var(--accent);animation:wave 1.9s ease-in-out infinite alternate}.wave i:nth-child(2){animation-delay:-.7s!important}.wave i:nth-child(3){animation-delay:-1.3s!important}@keyframes wave{to{transform:scaleY(.35)}}.icon-button{width:44px;height:44px;display:grid;place-items:center;background:transparent;color:#c9ced9;border-radius:50%;font-size:26px;font-weight:300;line-height:1}.icon-button:hover{background:rgba(255,255,255,.08);color:white}.icon-button svg{width:19px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.scene-marker{position:absolute;left:46px;top:32%;display:flex;gap:15px;align-items:center;color:#acb6ca;font-size:12px;letter-spacing:.15em;writing-mode:vertical-rl}.scene-marker>span:first-child{font-family:monospace;color:var(--accent);writing-mode:horizontal-tb;letter-spacing:.12em}.marker-line{height:64px;width:1px;background:linear-gradient(var(--border),#9a866a,var(--border))}.scene-caption{position:absolute;left:8%;bottom:24%;pointer-events:none}.eyebrow{font-size:12px;letter-spacing:.3em;color:var(--accent)}h1{font-size:clamp(35px,4.2vw,64px);font-weight:300;letter-spacing:.13em;margin:19px 0 17px;line-height:1.22;text-shadow:0 2px 30px #040710}.scene-caption p{font-size:15px;color:#c1c7d2;letter-spacing:.07em;margin:0 0 25px;line-height:1.7}.caption-note{font-size:12px;color:#939bae;letter-spacing:.1em}.view-controls{position:absolute;right:42px;top:45%;display:flex;flex-direction:column;align-items:center;border:1px solid var(--border);background:#070b1488;backdrop-filter:blur(12px);border-radius:26px;padding:6px}.view-controls>div{width:18px;height:1px;background:var(--border);margin:3px}.bottom-ui{position:absolute;bottom:66px;left:42px;right:42px;display:flex;align-items:center;justify-content:space-between;gap:25px}.journey-control{display:flex;align-items:center;gap:18px}.drift-button{border-radius:24px;padding:11px 19px;display:flex;align-items:center;gap:8px;min-height:44px;font-size:14px}.drift-button[aria-pressed=true]{color:var(--accent);border-color:#8a735b}.play-icon{font-size:22px;line-height:16px}.speed-control{display:flex;align-items:center;gap:9px;font-size:12px;color:var(--muted)}.speed-control input{width:64px}.speed-control output{min-width:23px;color:#d7dce4;font-family:monospace}.destinations{position:absolute;left:50%;transform:translateX(-50%);padding:5px;border-radius:40px;display:flex;gap:2px}.destination{background:transparent;border-radius:26px;padding:15px 21px;color:#9ca6b9;display:flex;gap:10px;align-items:center;white-space:nowrap;transition:.3s;font-size:14px;min-height:49px}.destination-number{font-family:monospace;font-size:11px;letter-spacing:.05em;color:#747f93}.destination:hover{color:#fff}.destination.active{background:rgba(171,156,137,.13);color:#f1dbbf;box-shadow:inset 0 0 0 1px #ccb29344}.destination.active .destination-number{color:#d5b38f}.help-button{display:flex;align-items:center;gap:9px;background:transparent;color:#aab3c4;font-size:13px;min-height:44px}.help-button>span{width:22px;height:22px;border:1px solid #788298;border-radius:50%;display:grid;place-items:center}.bottom-hint{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:14px;white-space:nowrap;font-size:12px;color:#8590a6}.bottom-hint b{font-weight:400;color:#5b6372}kbd{font-family:inherit;font-size:11px;border:1px solid #8b95a52e;border-radius:3px;padding:2px 4px;margin:0 2px;color:#a9b2c3}.popover{position:absolute;z-index:8;width:340px;border:1px solid var(--border);background:rgba(9,14,25,.96);backdrop-filter:blur(30px);border-radius:18px;padding:20px 23px;box-shadow:0 20px 80px #0008}.popover:not([hidden]){animation:appear .2s ease-out}#sound-panel{right:86px;top:96px}.panel-heading{display:flex;align-items:center;justify-content:space-between;font-size:16px}.panel-heading button{height:28px;width:28px;font-size:24px}.popover>p{font-size:13px;line-height:1.7;color:var(--muted);margin:9px 0 22px}.switch-row{display:flex;align-items:center;justify-content:space-between;margin-top:20px;font-size:14px}.switch-row small{display:block;color:#818da4;font-size:12px;margin-top:6px}.switch-row input{appearance:none;width:36px;height:21px;border-radius:15px;background:#303849;cursor:pointer;transition:.2s;position:relative}.switch-row input:before{content:"";position:absolute;left:3px;top:3px;width:15px;height:15px;background:#c6c9d1;border-radius:50%;transition:.2s}.switch-row input:checked{background:#ae8a60}.switch-row input:checked:before{transform:translateX(15px);background:white}.range-row{display:flex;align-items:center;gap:12px;margin:20px 0 26px;font-size:12px;color:var(--muted)}.range-row input{flex:1;min-width:50px}.range-row output{width:30px;font-family:monospace}input[type=range]{accent-color:var(--accent);height:3px;cursor:pointer}.quiet-button{width:100%;font-size:13px;padding:12px;background:#ffffff07;border:1px solid var(--border);border-radius:8px}.quiet-button:hover{background:#ffffff12}.popover>.audio-note{font-size:11px;margin:15px 0 0;color:#7b859a}.help-panel{right:42px;bottom:124px;width:375px}.help-panel dl{margin:22px 0}.help-panel dl>div{display:flex;justify-content:space-between;gap:18px;margin:16px 0;font-size:13px}.help-panel dt{color:#9aa5b9}.help-panel dd{margin:0;text-align:right;color:#ccd2df}#toast{position:absolute;top:110px;left:50%;transform:translateX(-50%);font-size:13px;background:#101626dd;border:1px solid var(--border);border-radius:24px;padding:12px 22px;opacity:0;transition:opacity .3s;pointer-events:none;z-index:12;max-width:85vw;text-align:center}#toast.visible{opacity:1}.immersed .interface{opacity:0;pointer-events:none}.immersed #space{cursor:grab}#exit-immersive{position:absolute;right:30px;bottom:28px;border-radius:25px;padding:12px 20px;font-size:13px;color:#b0b8c9;opacity:.55}#exit-immersive:hover{opacity:1}.touch-flight{display:none;position:absolute;right:18px;bottom:170px;text-align:center;touch-action:none}.touch-flight button{width:39px;height:39px;border:1px solid #b4c7ed26;border-radius:50%;background:#090e1a99;color:#bfcadd;margin:2px;font-size:19px}.touch-flight button:active{background:#d3af8044}.vertical-flight{margin-top:5px}.vertical-flight button{font-size:12px}.loading,.fallback{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#040710;z-index:20}.loading p{font-size:14px;letter-spacing:.2em;color:#aeb5c5}.loading-orbit{width:46px;height:46px;border-radius:50%;border:1px solid #e7bf9233;border-top-color:var(--accent);animation:spin 1.5s linear infinite}.fallback{padding:24px;text-align:center}.fallback h1{font-size:27px}.fallback p{color:#aeb5c5;line-height:1.8}.fallback button{background:#ad8c65;padding:12px 25px;border-radius:25px;margin-top:15px}@keyframes spin{to{transform:rotate(360deg)}}@keyframes appear{from{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}
@media(min-width:1500px){.scene-caption{left:9%;bottom:25%}.bottom-ui{bottom:78px}.topbar{top:38px}}
@media(max-width:1150px){.speed-control{display:none}.destination{padding:14px 17px}.scene-caption{left:8%;bottom:26%}.scene-caption h1{font-size:44px}}
@media(max-width:760px){.topbar{top:22px;left:22px;right:17px}.brand{gap:9px}.brand svg{width:34px}.brand strong{font-size:19px}.brand span{font-size:8px;letter-spacing:.14em}.top-actions{gap:8px}.mode-label{display:none}.sound-button{padding:10px 13px;font-size:12px}.scene-marker{top:25%;left:22px;font-size:11px}.scene-marker>span:last-child{display:none}.marker-line{height:40px}.scene-caption{left:26px;bottom:27%;max-width:70%}.eyebrow{font-size:10px;letter-spacing:.2em}.scene-caption h1{font-size:36px;margin:12px 0}.scene-caption p{font-size:13px;line-height:1.8;margin-bottom:15px}.caption-note{font-size:11px}.view-controls{right:19px;top:28%;padding:3px}.view-controls .icon-button{width:35px;height:37px}.bottom-ui{left:22px;right:22px;bottom:100px}.destinations{bottom:-68px;padding:4px;gap:0;max-width:95vw}.destination{padding:13px 18px;gap:8px;font-size:13px}.destination-number{font-size:10px}.bottom-hint{display:none}.help-button{font-size:12px}.drift-button{padding:9px 16px;font-size:13px}.touch-flight{display:block}.popover,#sound-panel{right:17px;top:88px;max-width:calc(100vw - 34px);width:340px}.help-panel{top:auto!important;bottom:152px;max-height:calc(100svh - 180px);overflow:auto}.popover{padding:17px 20px}.range-row{margin:17px 0 20px}.popover>p{margin-bottom:15px}.switch-row{margin-top:17px}.scene-caption .caption-note{display:none}.bottom-ui{gap:10px}#toast{top:90px;font-size:12px;width:max-content;max-width:90vw}#exit-immersive{right:20px;bottom:23px}}
@media(max-height:590px){.topbar{top:15px}.scene-caption{bottom:30%}.scene-caption h1{font-size:30px;margin:10px 0}.scene-caption p{margin-bottom:10px}.caption-note{display:none}.scene-marker{display:none}.bottom-ui{bottom:50px}.bottom-hint{bottom:15px}.popover{max-height:calc(100svh - 110px);overflow:auto}.touch-flight{bottom:100px}.help-panel{bottom:100px}.scene-caption{max-width:60%}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}
.cosmos-actions{position:absolute;left:8%;bottom:16%;display:flex;align-items:center;gap:17px}.observe-button{display:flex;gap:9px;align-items:center;border-radius:25px;padding:12px 18px;min-height:44px;font-size:14px}.observe-button.selected{color:#e8c79f;border-color:#c3a58255}.cosmos-actions>span{font-size:12px;letter-spacing:.08em;color:#8d98ad}.wide-universe .scene-caption{max-width:46%}.wide-universe .vignette{background:linear-gradient(180deg,rgba(3,5,12,.48),transparent 22%,transparent 55%,rgba(3,5,12,.8)),linear-gradient(90deg,rgba(3,5,12,.18),transparent 45%)}
@media(min-width:1500px){.cosmos-actions{left:9%}}
@media(max-width:760px){.destinations{width:calc(100vw - 32px);max-width:440px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-radius:27px}.destination{flex-direction:column;justify-content:center;gap:4px;padding:9px 5px;min-height:52px;font-size:13px}.destination-number{font-size:10px}.wide-universe .scene-caption{bottom:34%;max-width:65%}.wide-universe .scene-caption h1{font-size:32px}.wide-universe .scene-caption p{max-width:190px}.cosmos-actions{left:26px;bottom:24%;gap:0}.cosmos-actions>span{display:none}.observe-button{font-size:13px;padding:10px 15px}.wide-universe .scene-marker{top:23%}}
@media(max-height:590px){.cosmos-actions{bottom:19%;left:8%}.cosmos-actions>span{display:none}.wide-universe .scene-caption{bottom:32%}.wide-universe .scene-caption p{margin-bottom:0}.wide-universe .caption-note{display:none}}
.scene-marker{display:none}.wide-universe .scene-caption h1{font-size:clamp(32px,3.2vw,46px);letter-spacing:.18em}.wide-universe .scene-caption .eyebrow{color:#b4bfd6;letter-spacing:.22em;font-size:11px}.wide-universe .scene-caption p{color:#b7bdcc;font-weight:300}.wide-universe .scene-caption .caption-note{color:#76829a}.wide-universe .cosmos-actions>span{color:#7c879d}.waypoint-label{position:absolute;top:-24px;left:50%;transform:translateX(-50%);font-size:11px;letter-spacing:.2em;color:#7f8a9d;white-space:nowrap}.destinations{background:rgba(9,14,23,.35);border-color:#b6c5e020}.destination.active{background:#adb6c815;color:#d8dfef;box-shadow:inset 0 0 0 1px #b1bfd82b}.destination{padding:13px 24px}.observe-button.selected{color:#c5d1e5;border-color:#bccbe033}.wide-universe .vignette{background:linear-gradient(180deg,rgba(3,5,12,.28),transparent 19%,transparent 62%,rgba(3,5,12,.7))}
@media(max-width:760px){.wide-universe .scene-caption .eyebrow{font-size:9px;letter-spacing:.15em;max-width:210px;line-height:1.8}.wide-universe .scene-caption h1{font-size:29px}.destination{padding:10px 4px;min-height:46px;font-size:12px}.waypoint-label{top:-18px;font-size:9px}.wide-universe .scene-caption{bottom:33%}.cosmos-actions{bottom:24%}.destinations{bottom:-65px}}

/* A single, continuous universe: leave the centre of the view open. */
.together{position:absolute;z-index:9;left:42px;top:108px;max-width:calc(100vw - 84px)}.together-toggle{display:flex;align-items:center;gap:12px;padding:11px 17px;border-radius:24px;font-size:14px;text-align:left;max-width:100%}.two-stars{color:#d8c9ad;white-space:nowrap}.together-panel{top:54px;left:0;width:330px;max-height:calc(100svh - 195px);overflow:auto}.name-label{display:block;margin:20px 0 16px;font-size:14px;color:#9faac0}.name-label input,#chat-input{display:block;width:100%;min-width:0;background:#02060d77;border:1px solid #acbdd126;border-radius:9px;color:#e5e9f2;padding:11px 12px;font:inherit;font-size:16px;outline-offset:3px}.name-label input{margin-top:9px}.together-actions{display:flex;gap:8px}.together-actions .quiet-button,.point-button{font-size:14px;min-height:44px}.point-button{margin-top:9px}.together button:disabled{opacity:.4;cursor:default}.together button[aria-pressed=true]{color:#efd5ac;border-color:#d9bc7960;background:#dac19a10}.chat-messages{max-height:210px;overflow-y:auto;margin:18px 0 12px;overscroll-behavior:contain}.chat-message{padding:0 4px;margin:13px 0;overflow-wrap:anywhere}.chat-message span{font-size:12px;color:#c3b299}.chat-message p{font-size:15px;line-height:1.6;color:#d0d9ea;margin:5px 0}.chat-message.own span{color:#8d9aae}.chat-message.pending{opacity:.6}.chat-message.failed span{color:#e3ad9c}#chat-form{display:flex;gap:8px;align-items:center}#chat-form button{min-height:44px;padding:8px;font-size:14px;color:#d9c5a2;white-space:nowrap}.together-panel .together-note{font-size:12px;line-height:1.6;margin:12px 0 0;color:#8895ad}#reconnect{margin-top:8px;font-size:14px}.partner-label,.shared-point{position:absolute;pointer-events:none;transform:translate(-50%,-50%);z-index:3;white-space:nowrap;text-align:center}.partner-label i{display:block;margin:auto;width:8px;height:8px;border-radius:50%;background:#ffe5b5;box-shadow:0 0 12px 5px #eed0a675,0 0 35px 13px #dcc9a424}.partner-label span,.shared-point span{display:block;margin-top:16px;font-size:14px;color:#e4d8c5;text-shadow:0 1px 6px #000}.partner-direction,.point-direction{position:absolute;top:50%;right:70px;font-size:14px;color:#c8bea9;pointer-events:none;text-shadow:0 1px 6px #000;z-index:3}.point-direction{top:calc(50% + 28px);color:#c5d6e9}.shared-point i{font-size:35px;color:#deedff;font-style:normal;text-shadow:0 0 18px #a7c9fb}.shared-point span{margin-top:4px;color:#c5d6e9}.pointing{cursor:crosshair!important}.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}
@media(max-width:760px){.together{left:22px;top:86px;max-width:calc(100vw - 44px)}.together-toggle{font-size:14px;padding:9px 13px}.together-panel{top:49px!important;left:0;right:auto!important;width:min(330px,calc(100vw - 44px));max-height:calc(100svh - 155px)}.partner-direction,.point-direction{right:22px;top:44%;font-size:12px}.point-direction{top:calc(44% + 24px)}.chat-messages{max-height:140px}}
@media(max-height:590px){.together{top:76px}.together-panel{max-height:calc(100svh - 145px)}}
.redirect-button{min-height:44px;padding:10px 14px;border-radius:24px;background:#15203488;border:1px solid #b6c5e030;font-size:14px;color:#c7d1e3;white-space:nowrap}.redirect-button:hover{background:#243149aa;border-color:#b6c5e060}.journey-control{gap:12px}.help-panel dd{line-height:1.7}.speed-control{font-size:14px}.bottom-ui{bottom:52px}.bottom-hint{bottom:18px}
@media(max-width:1150px){.speed-control{display:flex}.speed-control>span{display:none}}
@media(max-width:760px){.bottom-ui{bottom:calc(24px + env(safe-area-inset-bottom));left:18px;right:18px;align-items:flex-end}.journey-control{max-width:calc(100% - 52px);flex-wrap:wrap;gap:8px}.speed-control{flex-basis:100%;order:3;padding:7px 4px 0}.speed-control>span{display:inline}.speed-control input{width:88px}.redirect-button{font-size:13px;padding:9px 12px}.help-button{font-size:0;gap:0;min-width:44px;justify-content:center}.help-button>span{font-size:14px}.touch-flight{bottom:155px}.cosmos-actions{bottom:26%;}.wide-universe .scene-caption{bottom:36%}.help-panel{bottom:130px}}
@media(max-height:590px){.bottom-ui{bottom:22px}.bottom-hint{display:none}.cosmos-actions{bottom:22%}.wide-universe .scene-caption{bottom:36%}.speed-control{display:none}.touch-flight{bottom:105px}.help-panel{bottom:83px}}

/* Keep direction hints clear of zoom controls. */
.partner-direction{top:22%;right:95px}.point-direction{top:calc(22% + 28px);right:95px}#chat-form button{border:1px solid #c5ad7a33;border-radius:9px;background:#c5ad7a0d}#chat-form button:hover{background:#c5ad7a22}
@media(max-width:760px){.partner-direction{top:21%;right:22px}.point-direction{top:calc(21% + 24px);right:22px}}

.partner-label i{visibility:hidden}