:root{color-scheme:dark;--bg:#0d0d0d;--ink:#f4f3ef;--muted:#858581;--line:#ffffff25;--accent:#f24c30;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}html{background:var(--bg);scrollbar-width:thin;scrollbar-color:#333 var(--bg)}body{margin:0;background:var(--bg);color:var(--ink)}button,input,textarea{font:inherit}button,a,input{ -webkit-tap-highlight-color:transparent}button,a{color:inherit}a{text-decoration:none}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:5px}.brain-sr-only,.brain-skip{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.brain-skip:focus{position:fixed;width:auto;height:auto;clip-path:none;z-index:100;padding:15px;background:var(--bg)}
.brain-header{position:fixed;z-index:30;inset:0 0 auto;height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 4vw;border-bottom:1px solid var(--line);background:#0d0d0df5}.brain-brand{display:flex;align-items:center;gap:12px;min-height:44px}.brain-brand img{width:26px;height:26px}.brain-brand span{font-size:17px;font-weight:600;letter-spacing:-.07em}.brain-header nav{display:flex;gap:19px;align-items:center}.brain-header nav a{font-size:12px;padding:8px 14px;border:1px solid transparent;border-radius:24px}.brain-header nav a:hover{border-color:#ffffff40}.brain-header nav a[aria-current]{border-color:#eee}
#brain-journey{height:350svh}.brain-stage{position:sticky;top:0;height:100svh;min-height:460px;overflow:hidden;background:var(--bg)}.brain-canvas,.brain-nodes{position:absolute;inset:0 10px 0 0}.brain-canvas canvas{display:block;width:100%;height:100%}.brain-nodes{pointer-events:none}.brain-loading{position:absolute;inset:48% 24px auto;text-align:center;color:var(--muted);font-size:12px;letter-spacing:.12em;pointer-events:none}.brain-loading[hidden]{display:none}
.neuron{position:absolute;left:0;top:0;display:flex;align-items:center;gap:8px;min-width:44px;min-height:44px;padding:0 8px 0 0;border:0;background:none;pointer-events:auto;white-space:nowrap;text-align:left;transform:translate(-22px,-22px);opacity:0;visibility:hidden;transition:opacity .45s,visibility .45s;color:#ccc;font-size:12px;line-height:1.2}.neuron.is-visible{opacity:1;visibility:visible}.neuron-dot{display:grid;place-items:center;flex:0 0 44px;height:44px;border:1px solid transparent;border-radius:50%;transition:border-color .25s,background .25s}.neuron-dot::after{content:"";width:5px;height:5px;border-radius:50%;background:#ffe5ce;box-shadow:0 0 8px #fff7,0 0 22px #f24c30c0;transition:transform .25s}.neuron-title{display:flex;gap:7px;padding:5px 0;max-width:140px;overflow:hidden;text-overflow:ellipsis;text-shadow:0 2px 8px #0d0d0d;font-weight:400}.neuron-title em{font-size:10px;font-style:normal;color:#8b8983;align-self:center}.neuron:hover,.neuron:focus-visible{color:white;z-index:3}.neuron:hover .neuron-dot,.neuron:focus-visible .neuron-dot{border-color:#f24c3070;background:#f24c3009}.neuron:hover .neuron-dot::after{transform:scale(1.6)}.neuron.is-saved .neuron-title::after{content:"·";color:var(--accent)}
.brain-caption{position:absolute;left:4vw;bottom:52px;pointer-events:none}.brain-caption::before{content:"";display:block;width:24px;height:1px;background:#eee;margin-bottom:14px}.brain-caption h1{font-size:23px;font-weight:400;letter-spacing:.13em;margin:0 0 11px}.brain-caption p{font-size:12px;line-height:1.7;color:var(--muted);margin:0}.brain-controls{position:absolute;right:calc(4vw + 10px);bottom:48px;display:flex;gap:30px;align-items:center}.brain-progress{display:grid;gap:8px;position:relative;width:190px;color:var(--muted);font:10px monospace}.brain-progress input{width:100%;height:24px;margin:0;cursor:ew-resize;accent-color:var(--accent)}#brain-phase{letter-spacing:.16em;text-align:center}.brain-pause{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted);border:0;background:none;min-height:44px;padding:0}.brain-pause>span:first-child{width:38px;height:38px;display:grid;place-items:center;border:1px solid #f24c3080;border-radius:50%;font-size:14px;color:#eee}.brain-pause:hover{color:#fff}.brain-next{position:absolute;right:0;top:64px;bottom:0;width:10px;background:var(--accent);transition:width .25s}.brain-next span{position:absolute;writing-mode:vertical-rl;top:50%;left:12px;font:10px monospace;letter-spacing:.15em;opacity:0;white-space:nowrap;transform:translateY(-50%)}.brain-next:hover,.brain-next:focus-visible{width:36px}.brain-next:hover span,.brain-next:focus-visible span{opacity:1}
.thought-dialog{color:var(--ink);background:#151515f5;border:1px solid #ffffff30;border-radius:2px;padding:28px 32px 24px;width:min(530px,calc(100vw - 40px));max-height:calc(100svh - 96px);overflow:auto;box-shadow:0 30px 120px #0009;backdrop-filter:blur(20px)}.thought-dialog::backdrop{background:#0505059c;backdrop-filter:blur(7px)}.thought-top{display:flex;align-items:center;justify-content:space-between;gap:20px}.thought-top p{font:11px monospace;letter-spacing:.1em;color:var(--muted);margin:0}.thought-close{display:grid;place-items:center;width:44px;height:44px;margin:-12px -12px -4px 0;font-size:26px;font-weight:300;border:0;background:none;color:#aaa}.thought-close:hover{color:#fff}.thought-dialog h2{margin:27px 0 28px;font-size:25px;font-weight:400;letter-spacing:-.03em}.thought-dialog label{display:block;font-size:11px;color:#a5a49e;margin-bottom:10px}.thought-dialog input,.thought-dialog textarea{display:block;width:100%;color:#eee;background:transparent;border:0;border-bottom:1px solid #ffffff25;padding:8px 0 14px;border-radius:0;line-height:1.8;font-size:14px;margin-bottom:25px;resize:vertical}.thought-dialog input::placeholder,.thought-dialog textarea::placeholder{color:#696965}.thought-dialog textarea{min-height:150px;max-height:38svh}.thought-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px}.thought-bottom p{font-size:11px;color:var(--muted);line-height:1.7;max-width:60%}.thought-save{min-height:44px;border:1px solid #ffffff40;background:transparent;color:#eee;padding:8px 15px;white-space:nowrap;font-size:12px}.thought-save:hover{background:#f24c30;border-color:#f24c30;color:#0d0d0d}.thought-privacy{color:#777772;font-size:10px;line-height:1.8;margin:22px 0 0}.brain-stage.is-fallback .neuron{visibility:visible;opacity:1}.brain-stage.is-fallback .neuron:nth-child(1){left:28%!important;top:34%!important}.brain-stage.is-fallback .neuron:nth-child(2){left:57%!important;top:43%!important}.brain-stage.is-fallback .neuron:nth-child(3){left:23%!important;top:59%!important}.brain-stage.is-fallback .neuron:nth-child(4){left:61%!important;top:62%!important}.brain-stage.is-fallback .neuron:nth-child(5){left:46%!important;top:72%!important}
@media(max-width:700px){.brain-header{height:64px;justify-content:center;padding:0}.brain-brand{justify-content:center;width:64px;height:64px}.brain-brand img{width:32px;height:32px}.brain-brand span{display:none}.brain-header nav{position:absolute;left:0;right:0;top:64px;padding:14px 20px 20px;display:none;flex-direction:column;gap:8px;background:#0d0d0d;border-bottom:1px solid var(--line)}.brain-header.is-open nav{display:flex}.brain-header nav a{width:100%;min-height:48px;display:grid;place-items:center;border:1px solid #ffffff50;font-size:15px;border-radius:16px}.brain-header nav a[aria-current]{background:#eee;color:#0d0d0d}.brain-caption{left:24px;bottom:104px}.brain-caption h1{font-size:20px;margin-bottom:9px}.brain-caption p{font-size:11px}.brain-controls{left:24px;right:34px;bottom:27px;justify-content:space-between;gap:20px}.brain-progress{width:150px}.brain-caption::before{margin-bottom:11px}.neuron{font-size:11px;gap:3px}.neuron-title{max-width:86px}.neuron-title em{font-size:9px}.thought-dialog{padding:22px;width:calc(100vw - 32px)}.thought-dialog h2{font-size:23px;margin:20px 0 24px}.thought-dialog input,.thought-dialog textarea{font-size:16px}.thought-bottom{gap:10px}.brain-stage{min-height:420px}}
@media(max-height:530px) and (min-width:701px){.brain-caption{bottom:22px}.brain-controls{bottom:18px}.brain-caption h1{font-size:18px}.brain-caption::before{display:none}}
.brain-canvas{opacity:0;transition:opacity 1.1s ease}
.brain-stage[data-ready="true"] .brain-canvas{opacity:1}
.brain-depth-demo{height:100svh;overflow:hidden}
.brain-depth-demo #brain-journey{height:100svh}
.brain-depth-demo .brain-stage{min-height:0}
.brain-depth-demo .brain-canvas{touch-action:none}
.brain-depth-demo .brain-progress{width:auto;min-width:110px;letter-spacing:.12em}
.brain-reset{font:11px Arial,"PingFang SC",sans-serif;color:var(--muted);background:none;border:0;padding:10px 0;min-height:44px}
.brain-reset:hover{color:var(--ink)}
.brain-depth-demo .brain-stage:focus-visible{outline:1px solid var(--accent);outline-offset:-4px}
.brain-depth-demo .brain-stage::after{content:"";position:absolute;inset:0;pointer-events:none;z-index:2;background:linear-gradient(to bottom,transparent 70%,#0d0d0d99 85%,#0d0d0d 100%)}
.brain-depth-demo .brain-caption,.brain-depth-demo .brain-controls{z-index:3}
.brain-depth-demo .neuron-title{font-size:11px}
@media(max-width:700px){.brain-depth-demo .brain-controls{gap:14px}.brain-depth-demo .brain-progress{min-width:95px}.brain-depth-demo .brain-controls .brain-pause{gap:8px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;scroll-behavior:auto!important}}
.brain-depth-demo .brain-controls{left:4vw;right:calc(4vw + 10px);justify-content:space-between}
.brain-depth-control{display:flex;align-items:center;gap:10px;color:#aaa9a3;font:11px monospace;letter-spacing:.12em}
.brain-depth-control input{width:13ch;min-height:44px;padding:8px 0;background:transparent;border:0;border-bottom:1px solid transparent;border-radius:0;color:#eee;font:inherit;letter-spacing:.05em;appearance:textfield;-moz-appearance:textfield;cursor:text}
.brain-depth-control input::-webkit-inner-spin-button,.brain-depth-control input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}
.brain-depth-control input:hover,.brain-depth-control input:focus{border-bottom-color:#ffffff50}
.brain-home{width:44px;height:44px;display:grid;place-items:center;padding:8px;border:0;background:transparent;color:#bdbbb4;transition:color .2s,transform .2s}
.brain-home svg{width:28px;height:28px}.brain-home:hover{color:#fff;transform:scale(1.06)}
.brain-motion[hidden]{display:none}.brain-motion{pointer-events:auto;margin-left:auto;margin-right:18px}
@media(max-width:700px){.brain-depth-demo .brain-controls{left:24px;right:34px}}
.brain-depth-demo .space-links a{text-decoration:none}
.brain-depth-demo .brain-controls{right:112px}
.brain-depth-marker{font:12px monospace;letter-spacing:.1em;color:#c4c1b9;margin:0;opacity:0;transition:opacity .6s;pointer-events:none}.brain-depth-marker.is-visible{opacity:1}
.brain-depth-demo .brain-controls{pointer-events:none}.brain-depth-demo .brain-home{pointer-events:auto}
.brain-depth-demo .space-header{font-family:Arial,"PingFang SC",sans-serif}
@media(max-width:700px),(max-height:500px) and (pointer:coarse){.brain-depth-demo .brain-canvas,.brain-depth-demo .brain-nodes{right:0;bottom:52px}.brain-depth-demo .brain-controls{right:24px;bottom:max(80px,calc(env(safe-area-inset-bottom) + 68px))}}