:root{color-scheme:dark;--brand-width:clamp(280px,22vw,360px);--logo-fraction:.36;--gutter:clamp(24px,3.4vw,64px)}
*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;overflow:hidden;background:#090909}body{font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:#fff;-webkit-font-smoothing:antialiased}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible{outline:1px solid currentColor;outline-offset:6px}button{min-height:44px}button:hover{color:#c9c9c9}[hidden]{display:none!important}#stage{position:fixed;inset:0;overflow:hidden;touch-action:none}.fullscreen{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}#hero{z-index:0}#lens{z-index:1;background:#090909}#white-field{position:absolute;inset:0;background:#fff;opacity:0;z-index:2;pointer-events:none}#reveal{position:absolute;inset:0;display:grid;place-items:center;z-index:3;opacity:0;pointer-events:none;overflow:hidden}#logo-video{width:calc(var(--brand-width) / var(--logo-fraction));max-width:none;flex-shrink:0;filter:grayscale(1) contrast(1.06);mix-blend-mode:multiply}#bridge{position:absolute;left:50%;top:50%;width:var(--brand-width);transform:translate(-50%,-50%);filter:brightness(0) invert(1);opacity:0;z-index:4;pointer-events:none}#intro-ui{position:absolute;bottom:max(45px,env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);z-index:5;text-align:center;transition:opacity .25s;white-space:nowrap}#scroll-hint{margin:0 0 22px;font-size:14px;letter-spacing:.16em;text-shadow:0 1px 14px #000}#scroll-hint span{display:block;font-size:10px;letter-spacing:.22em;margin-top:10px;opacity:.55}.progress{height:1px;width:112px;margin:auto;background:#ffffff30;overflow:hidden}.progress i{display:block;width:100%;height:1px;background:#fff;transform:scaleX(0);transform-origin:left}#skip{position:fixed;right:var(--gutter);bottom:max(35px,env(safe-area-inset-bottom));z-index:6;font-size:12px;letter-spacing:.08em;opacity:.65}#skip span{margin-left:12px}#header{position:fixed;top:0;left:0;width:100%;z-index:10;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:30px;padding:26px var(--gutter);opacity:0;visibility:hidden;transform:translateY(-7px);transition:opacity .8s,transform .8s,visibility .8s}#header:before{content:"";position:absolute;inset:0 0 -65px;background:linear-gradient(#00000040,transparent);pointer-events:none;z-index:-1}body[data-phase="hero"] #header{opacity:1;visibility:visible;transform:none}.wordmark{display:inline-flex;align-items:center;justify-self:start;min-height:44px}.wordmark img{display:block;width:126px;height:auto;filter:brightness(0) invert(1)}#navigation{display:flex;gap:clamp(24px,3vw,52px);align-items:center;font-size:14px;letter-spacing:.07em}#navigation>button,.cases>button{padding:0;white-space:nowrap}.cases{position:relative}.chevron{display:inline-block;width:6px;height:6px;border-right:1px solid;border-bottom:1px solid;transform:rotate(45deg);vertical-align:3px;margin-left:8px;transition:transform .2s}[aria-expanded="true"] .chevron{transform:rotate(225deg);vertical-align:0}#cases-menu{position:absolute;top:54px;left:-22px;min-width:166px;padding:12px 0;background:#111111f5;border:1px solid #ffffff20}#cases-menu button{display:block;text-align:left;width:100%;padding:0 22px;font-size:14px}#cases-menu button:hover{background:#ffffff0d;color:#fff}.login{justify-self:end;border:1px solid #ffffff75;min-width:90px;padding:0 18px;font-size:13px}.login span{margin-left:16px}.login:hover{background:white;color:#111}.mobile-login,#menu-toggle{display:none}#toast{position:fixed;left:50%;bottom:40px;transform:translate(-50%,10px);padding:14px 22px;max-width:calc(100% - 40px);width:max-content;font-size:14px;background:#111e;border:1px solid #ffffff25;opacity:0;pointer-events:none;transition:.25s;z-index:20}#toast.visible{opacity:1;transform:translate(-50%,0)}#playback-message{position:absolute;z-index:8;top:65%;left:50%;transform:translateX(-50%);text-align:center;font-size:14px;padding:16px;background:#111e;color:#fff;max-width:90vw;width:max-content}#playback-message p{margin:0 0 8px}#resume{border:1px solid #ffffff65;padding:0 24px}.no-script{position:fixed;inset:0;z-index:30;display:grid;place-items:center;background:#111}
@media(min-width:901px){#navigation{visibility:visible!important}}
@media(max-width:900px){:root{--gutter:28px;--brand-width:280px}#header{padding:20px var(--gutter);grid-template-columns:1fr auto;gap:16px}.wordmark img{width:112px}.login{display:none}#menu-toggle{display:flex;width:44px;height:44px;flex-direction:column;align-items:center;justify-content:center;gap:7px;padding:8px;z-index:12}#menu-toggle span{height:1px;width:25px;background:currentColor;transition:transform .3s}body.menu-open #menu-toggle span:first-child{transform:translateY(4px) rotate(45deg)}body.menu-open #menu-toggle span:last-child{transform:translateY(-4px) rotate(-45deg)}#navigation{position:fixed;inset:0;height:100dvh;background:#0c0c0c;z-index:-1;display:flex;flex-direction:column;align-items:stretch;gap:0;padding:112px var(--gutter) 32px;overflow-y:auto;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s}body.menu-open #navigation{opacity:1;visibility:visible}#navigation>button,.cases>button{font-size:22px;text-align:left;min-height:70px;width:100%;border-bottom:1px solid #ffffff1c;letter-spacing:.1em}.cases>button{display:flex;align-items:center;justify-content:space-between}#cases-menu{position:static;background:none;border:0;padding:8px 0 16px}#cases-menu button{color:#aaa;padding:0;font-size:15px;min-height:44px}.mobile-login{display:flex;align-items:center;justify-content:space-between!important;margin-top:auto;padding-top:18px!important}.chevron{margin-right:10px}.wordmark{z-index:12}}
@media(max-width:600px){:root{--gutter:22px;--brand-width:170px}#header{padding-top:max(16px,env(safe-area-inset-top))}.wordmark img{width:104px}#intro-ui{bottom:95px}#skip{bottom:25px}#scroll-hint{font-size:13px}#logo-video{width:calc(var(--brand-width) / var(--logo-fraction))}}
@media(prefers-reduced-motion:reduce){*,*:before{transition-duration:.01ms!important}}
/* Login reference: 30px circular account icon and 890 × 532 split dialog. */
.login{width:44px;height:44px;min-width:44px;border:0;border-radius:50%;padding:7px;background:transparent}.login svg{width:30px;height:30px;display:block;border-radius:50%;background:#ffffff33;stroke:#fff;stroke-width:1.5}.login:hover{background:none;color:white;opacity:.8}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
#login-dialog{color-scheme:light;width:890px;max-width:calc(100vw - 40px);height:532px;max-height:calc(100dvh - 40px);padding:0;border:0;border-radius:0;background:#fff;color:#25252d;box-shadow:0 0 20px #00000012;overflow:auto}#login-dialog::backdrop{background:#000b}#login-dialog[open]{animation:login-enter .3s ease-out}.login-layout{height:100%;min-height:532px;display:flex;align-items:center;justify-content:space-between;padding:25px 70px 25px 25px;gap:32px}.login-close{position:absolute;right:8px;top:8px;width:44px;height:44px;line-height:1;padding:0;font-size:28px;font-weight:300;z-index:1;color:#25252d;display:grid;place-items:center;transform:none;transition:background-color .2s}.login-close:hover{color:#25252d;background:#f4f5f6;transform:none}.login-close-icon{display:block;pointer-events:none;transition:transform .3s;transform-origin:center}.login-close:hover .login-close-icon{transform:rotate(90deg)}.login-cover{width:380px;height:482px;object-fit:cover;border-radius:20px;flex-shrink:0}.login-panel{width:320px;flex-shrink:0}.login-mobile-title{display:none}.login-tabs{display:flex;align-items:center;gap:28px;margin-bottom:23px}.login-tabs button{position:relative;min-height:23px;padding:0 0 9px;color:#ccc;font-size:13px;font-weight:600}.login-tabs button[aria-selected="true"]{color:#25252d}.login-tabs button[aria-selected="true"]:after{content:"";position:absolute;width:10px;height:3px;border-radius:2px;bottom:0;left:calc(50% - 5px);background:#25252d}.phone-field,.password-field{display:flex;align-items:center;background:#f4f5f6;border-radius:6px;height:44px}.phone-field select{border:0;background:transparent;color:#25252d;font:600 13px Arial,sans-serif;width:81px;padding:0 12px 0 18px;outline-offset:-2px}.login-panel input:not([type="checkbox"]){font:14px Arial,"PingFang SC",sans-serif;color:#25252d;min-width:0;flex:1;width:100%;height:44px;padding:0 20px;border:0;background:transparent;border-radius:6px;outline-offset:-2px}.login-panel input::placeholder{color:#d0d1d2}.phone-field input{padding-left:12px!important}.password-field{margin-top:20px}.password-field button{width:40px;padding:10px;flex-shrink:0;display:grid;place-items:center;color:#25252d}.password-field svg{width:18px;height:18px;stroke:currentColor;stroke-width:1.6}.code-field{display:flex;align-items:center;margin-top:20px;gap:14px}.code-field input{background:#f4f5f6!important}.code-field button{font-size:12px;white-space:nowrap;color:#25252d}.login-actions{display:flex;gap:10px;margin-top:20px}.login-actions button,.social-login>button,#back-to-login{border:1px solid #e7e7e9;border-radius:6px;flex:1;font-size:13px;font-weight:500;padding:0 16px;color:#25252d;height:44px}.login-actions .primary{background:#25252d;border-color:#25252d;color:#fff}.login-actions button:hover,.social-login>button:hover{opacity:.8}.login-divider{display:flex;gap:10px;align-items:center;color:#969696;margin:20px 0;font-size:12px}.login-divider:before,.login-divider:after{content:"";height:1px;background:#e7e7e9;flex:1}.social-login>button{width:100%;display:flex;align-items:center;justify-content:center;gap:10px}.social-login img{width:20px;height:20px;object-fit:contain}.agreement{display:flex;align-items:flex-start;gap:7px;margin-top:30px;color:#aaa;font-size:10px;line-height:18px;white-space:normal}.agreement input{appearance:none;width:13px;height:13px;border:1.5px solid #25252d;border-radius:50%;margin:2px 0 0;flex-shrink:0;cursor:pointer}.agreement input:checked:after{content:"";display:block;width:5px;height:3px;border-left:1.4px solid #25252d;border-bottom:1.4px solid #25252d;transform:translate(2.5px,2.5px) rotate(-45deg)}.agreement button{display:inline;min-height:0;padding:0;color:#25252d;font-size:inherit;line-height:inherit}.agreement button:hover{text-decoration:underline}#auth-feedback{font-size:12px;line-height:1.6;margin:10px 0 -8px;color:#92503e}#wechat-panel{text-align:center}#wechat-panel h2{font-size:19px;font-weight:500}.wechat-placeholder{padding:30px 0 45px}.wechat-placeholder img{width:42px;height:42px}.wechat-placeholder p{font-size:14px;margin-top:24px}.wechat-placeholder small{color:#999;font-size:12px}#back-to-login{width:100%}.login-panel button:disabled{cursor:default;opacity:.45}@keyframes login-enter{from{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}
@media(max-width:900px) and (min-width:641px){#login-dialog{height:500px}.login-layout{min-height:500px;padding:25px;gap:28px}.login-cover{width:calc(100% - 348px);height:450px}.login-panel{width:320px}}
@media(max-width:640px){#login-dialog{position:fixed;inset:auto 0 0;margin:0;width:100%;max-width:none;height:85dvh;max-height:85dvh;border-radius:12px 12px 0 0}#login-dialog[open]{animation:login-up .3s ease-out}.login-layout{min-height:0;height:auto;padding:60px 24px 35px;display:block}.login-cover{display:none}.login-panel{width:100%;max-width:390px;margin:auto}.login-mobile-title{display:block;font-size:24px;margin:0 0 24px;font-weight:600}.login-tabs{gap:28px}.login-tabs button{font-size:14px}.agreement{font-size:11px;margin-top:26px;line-height:20px}.social-login{display:block}.login-close{right:8px;top:8px}@keyframes login-up{from{transform:translateY(100%)}to{transform:translateY(0)}}}

@media(prefers-reduced-motion:reduce){#login-dialog[open]{animation:none}}

/* Public release omits unfinished membership and demo login. */
[data-login],[data-page="member.html"],.editor-entry{display:none!important}.admin-session .editor-entry{display:block!important}

#case-demo-note,#spatial-note,#production-note{display:none!important}