:root{font-family:Inter,"Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#253c3b;background:#f5f6f2;font-synthesis:none;line-height:1.6;--green:#28695c;--muted:#6a7975;--border:#dde4df}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button,a,input,textarea{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.48;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,pre:focus-visible{outline:3px solid #66b89d;outline-offset:3px}.header{height:88px;padding:0 max(28px,calc((100vw - 1440px)/2));display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid var(--border);gap:20px}.brand{display:flex;align-items:center;gap:11px;font-size:21px;letter-spacing:-.4px;line-height:1.25}.brand b{font-weight:500;color:var(--green)}.brand small{display:block;font-size:11px;letter-spacing:1.5px;color:var(--muted);margin-top:5px}.brand-mark{height:40px;width:40px;display:grid;place-items:center;border:3px solid var(--green);border-radius:11px;font-weight:700;color:var(--green);font-size:25px}.header nav{display:flex;gap:30px;font-size:14px;color:#52625c}.header nav a:hover{color:var(--green)}main{max-width:1440px;margin:auto;padding:38px 28px 20px}.intro{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:27px}.eyebrow{font-size:11px;font-weight:700;letter-spacing:2.7px;color:#5d8274;margin:0 0 10px}h1{font-weight:600;font-size:31px;line-height:1.4;letter-spacing:-.5px;margin:0 0 9px}.intro>div>p:last-child{margin:0;color:var(--muted);font-size:14px}.connection{font-size:12px;white-space:nowrap;padding:7px 12px;border-radius:20px;background:#e6ede7;color:#456b54}.connection::before{content:"";display:inline-block;width:6px;height:6px;background:#588968;border-radius:50%;margin-right:7px}.environment-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:27px;min-height:142px}.environment{position:relative;text-align:left;border:1px solid var(--border);background:#fff;border-radius:14px;padding:19px 20px;min-height:142px;color:inherit;transition:border-color .15s,box-shadow .15s}.environment:hover{border-color:#84ab97}.environment.active{border:2px solid var(--green);padding:18px 19px;background:#f4faf6;box-shadow:0 3px 12px #28695c0a}.environment .env-icon{font-size:19px;color:var(--green);display:block;line-height:1.2;margin-bottom:9px}.environment .env-name{font-size:18px;display:block;font-weight:600}.environment .env-description{font-size:12px;color:var(--muted);display:block;margin-top:4px;padding-right:40px}.environment .env-state{position:absolute;right:18px;top:19px;font-size:10px;color:#52765c;background:#e9f1e8;padding:2px 7px;border-radius:12px}.environment[aria-disabled="true"] .env-state{background:#f2eee2;color:#826942}.workspace-layout{display:grid;grid-template-columns:minmax(0,1fr) 354px;align-items:start;gap:22px}.workbench,.tutor{background:#fff;border:1px solid var(--border);border-radius:15px;overflow:hidden;min-width:0}.workbench-title{padding:20px 24px 17px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #edf0ec}.small-label{font-size:10px;color:var(--muted);letter-spacing:1px}h2{font-size:18px;line-height:1.4;margin:2px 0 0;font-weight:600}.quiet{background:transparent;border:0;color:var(--green);padding:8px 3px;font-size:12px;white-space:nowrap}.environment-detail{padding:16px 24px 10px}.environment-detail p{font-size:12px;color:var(--muted);margin:0 0 9px}.package-list{display:flex;flex-wrap:wrap;gap:6px}.package-list span{font-family:monospace;font-size:10px;line-height:1.5;background:#f1f4f0;padding:3px 7px;border-radius:5px;color:#576c61}.step-bar{display:flex;gap:11px;padding:14px 24px 13px;align-items:center}.step-number{background:#eaf2ed;color:var(--green);width:27px;height:27px;display:grid;place-items:center;border-radius:8px;font-size:12px;font-weight:600}h3{font-size:13px;margin:0;font-weight:600}.step-bar p{font-size:11px;color:var(--muted);margin:2px 0 0}.commands{padding:0 24px 16px;display:flex;flex-wrap:wrap;gap:7px}.commands button{font-size:11px;border:1px solid #dce5df;background:#fff;border-radius:7px;color:#47695a;padding:7px 9px}.commands button:hover{background:#f1f7f2}.commands button.selected{background:#e9f3ec;border-color:#8eae98}#command-form{margin:0 24px 15px}#command-form label{font-size:11px;color:#637367}.command-row{display:flex;align-items:center;gap:8px;border:1px solid #cddbd1;border-radius:8px;margin-top:6px;padding:5px 6px 5px 12px;background:#fafcf9}.command-row>span{color:#6b8d78}.command-row input{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;min-width:0;flex:1;border:0;background:transparent;font-size:12px;outline:0;padding:7px 0;color:#304e3b}.command-row button,#ask{border:0;background:var(--green);color:#fff;font-size:12px;border-radius:6px;padding:8px 14px;white-space:nowrap}.help{font-size:10px;color:var(--muted);margin:6px 0 0}.terminal-top{margin:0 24px;display:flex;align-items:center;gap:13px}.terminal-top h3{font-size:11px}.terminal-top>span{font-size:10px;color:#738376}.terminal-top .quiet{margin-left:auto}.terminal{background:#192923;color:#c5ddcb;min-height:212px;max-height:390px;overflow:auto;margin:4px 24px 0;border-radius:9px;padding:18px;font:12px/1.8 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre-wrap;word-break:break-word;tab-size:2}.result-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:7px 24px 14px;font-size:10px;color:var(--muted)}.tutor{display:flex;flex-direction:column;min-height:636px}.tutor-title{padding:19px 17px;display:flex;align-items:center;gap:9px;border-bottom:1px solid #edf0ec}.tutor-avatar{display:grid;place-items:center;width:34px;height:34px;background:#e7f0ea;border-radius:10px;color:var(--green);font-size:24px}.tutor-title h2{font-size:14px}.tutor-title p{font-size:9px;color:var(--muted);margin:2px 0 0}.available{margin-left:auto;font-size:9px;color:#638c70}.messages{padding:17px 16px 8px;overflow:auto;min-height:285px;max-height:430px;flex:1}.message{padding:12px 13px;margin-bottom:13px;border-radius:11px;background:#f0f5f0;font-size:12px;overflow-wrap:anywhere}.message>span{font-size:9px;color:#698471;font-weight:600}.message p{white-space:pre-wrap;line-height:1.8;margin:5px 0 0}.message.user{background:#f3f4f2;margin-left:22px}.message.user>span{color:#758074}.message.error{background:#fff5e9;color:#8a5d2c}.suggestions{padding:6px 17px 12px;display:flex;gap:6px;flex-wrap:wrap}.suggestions button{font-size:10px;padding:6px 9px;color:#587460;border:1px solid #dbe5db;background:#fff;border-radius:20px}#tutor-form{margin:0 15px;border:1px solid #d4ded4;border-radius:10px;overflow:hidden}textarea{display:block;width:100%;resize:vertical;border:0;padding:12px 12px 5px;outline:0;font-size:12px;line-height:1.7;min-height:75px;color:#334b3a}textarea::placeholder{color:#94a093}.composer-footer{display:flex;align-items:center;justify-content:space-between;padding:4px 8px 8px;gap:4px}.composer-footer>span{font-size:8px;color:#8d998b}.tutor-note{color:#929c90;font-size:9px;text-align:center;margin:10px 8px 13px}.notice{font-size:13px;border:1px solid #e8d7bb;background:#fff9ec;padding:12px 15px;border-radius:8px;color:#8b6338}footer{max-width:1440px;margin:10px auto;padding:18px 28px 26px;display:flex;gap:20px;font-size:10px;color:#8b988b}footer>a{margin-left:auto}.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}.mobile-switch{display:none}
@media(min-width:1001px){#tutor-panel[hidden]{display:flex}#workspace-panel[hidden]{display:block}}
@media(max-width:1150px){.workspace-layout{grid-template-columns:minmax(0,1fr) 320px;gap:16px}main{padding-top:28px}h1{font-size:27px}.header nav{gap:20px}}
@media(max-width:1000px){.workspace-layout{display:block}.tutor{margin-top:16px;min-height:540px}.mobile-switch{display:flex;gap:0;margin:0;border-bottom:1px solid var(--border)}.mobile-switch button{flex:1;background:#fff;border:0;border-bottom:2px solid transparent;padding:13px;color:#7b877c;font-size:13px}.mobile-switch button[aria-selected="true"]{border-bottom-color:var(--green);color:var(--green);font-weight:600}.tutor[hidden]{display:none}#workspace-panel[hidden]{display:none}.messages{max-height:460px}.available{font-size:11px}.tutor-title p{font-size:11px}.tutor-title h2{font-size:16px}.tutor-note{font-size:11px}.composer-footer>span{font-size:10px}}
@media(max-width:600px){.header{height:72px;padding:0 17px}.brand{font-size:18px}.brand-mark{width:32px;height:32px;border-radius:9px;font-size:20px}.brand small{font-size:9px;letter-spacing:1px}.header nav{font-size:11px;gap:10px}.header nav a:first-child{display:none}main{padding:24px 13px 12px}.intro{display:block;margin-bottom:20px}.eyebrow{font-size:9px;letter-spacing:2px}h1{font-size:23px}.intro>div>p:last-child{font-size:12px}.connection{display:inline-block;font-size:10px;margin-top:13px;padding:4px 9px}.environment-grid{gap:8px;min-height:128px;margin-bottom:16px}.environment{padding:13px 9px;border-radius:10px;min-height:128px}.environment.active{padding:12px 8px}.environment .env-icon{font-size:16px;margin-bottom:16px}.environment .env-name{font-size:12px;letter-spacing:-.2px}.environment .env-description{font-size:10px;padding:0;line-height:1.6}.environment .env-state{font-size:8px;top:12px;right:7px;padding:1px 4px}.workbench-title{padding:15px 16px}h2{font-size:16px}.environment-detail{padding:14px 16px 6px}.step-bar{padding:13px 16px}.step-bar p{font-size:10px}.commands{padding:0 16px 14px;gap:6px}.commands button{font-size:10px;padding:7px 8px}#command-form{margin:0 16px 12px}.command-row{gap:5px;padding-left:9px}.command-row input{font-size:11px}.command-row button{padding:8px 11px}.terminal-top{margin:0 16px}.terminal{margin:4px 16px 0;min-height:240px;padding:13px;font-size:11px}.result-footer{margin:7px 16px 12px;display:block}.result-footer>span{display:block}.result-footer button{display:block;margin-left:auto}.tutor{margin-top:12px}.message{font-size:13px}.message>span{font-size:10px}textarea{font-size:13px}footer{padding:10px 17px 24px;font-size:9px;gap:10px}footer>span{display:none}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
.code-editor{margin:0 24px 15px;border:1px solid #dce4dc;border-radius:8px}.code-editor summary{cursor:pointer;font-size:12px;padding:10px 12px;color:#3c6250}.code-editor summary span{font-size:10px;color:#8a998d;float:right}.editor-content{border-top:1px solid #e4ebe3;padding:12px}.editor-content label{font-size:10px;color:#6f8273}.editor-content textarea{font:11px/1.7 ui-monospace,SFMono-Regular,Consolas,monospace;background:#f5f8f3;border:1px solid #e3e9df;margin-top:5px;padding:12px;max-height:400px;tab-size:4;white-space:pre;overflow:auto;resize:vertical}.editor-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:8px}.editor-footer p{font-size:10px;color:#758572;margin:0;max-width:75%}.editor-footer button{border:0;background:var(--green);color:white;font-size:11px;padding:8px 12px;border-radius:6px;white-space:nowrap}@media(max-width:600px){.code-editor{margin:0 16px 12px}.editor-footer{align-items:end}.editor-footer p{font-size:9px;max-width:65%}}
.tutor-launcher{display:none}@media(min-width:1001px){.tutor{position:sticky;top:18px}}@media(max-width:1000px){.tutor-launcher{display:block;position:fixed;z-index:10;right:18px;bottom:max(16px,env(safe-area-inset-bottom));border:0;border-radius:24px;background:#28695c;color:#fff;padding:12px 18px;box-shadow:0 4px 18px #193e402b;font-size:13px}footer{padding-bottom:80px}.tutor{scroll-margin-top:12px}.workbench{scroll-margin-top:12px}}

/* OriginMind visual shell. Existing header heights and learning panels stay in place. */
:root{--green:#545b48;--muted:#68665f;--border:#dcd8d0;color:#30302d;background:#faf9f6;font-family:Arial,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif}
.header{background:#fff;color:#30302d}.header .brand{font-weight:500;letter-spacing:-.025em}.header .brand img{display:block;flex:none;object-fit:contain;width:29px;height:29px}.header .brand small{letter-spacing:0}.header nav{gap:16px;align-items:center;color:#30302d}.header .om-cloud-menu-button{flex:none}
@media(max-width:600px){.header{gap:10px}.header .brand img{width:25px;height:25px}.header nav{gap:8px}.header nav a:nth-child(2){font-size:11px}}
.cn-footer { padding: 56px 0 24px; background: #232420; color: #ccc7bc; }
.cn-footer .cn-footer-wrap { width: min(1380px, 88%); margin: 0 auto; padding: 0; }
.cn-footer .cn-footer-grid { display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 36px; }
.cn-footer .cn-footer-grid > div { min-width: 0; }
.cn-footer .cn-footer-wordmark { display: inline-block; font-size: 25px; font-weight: 500; letter-spacing: -.025em; line-height: 1.2; color: #f5f3ef; margin: 0 0 18px; }
.cn-footer .cn-footer-brand p { font-size: 14px; line-height: 1.9; margin: 0 0 12px; color: #ccc7bc; }
.cn-footer .cn-footer-brand > a:not(.cn-footer-wordmark) { display: block; width: fit-content; min-height: 44px; padding: 10px 0; font-size: 13px; line-height: 1.8; overflow-wrap: anywhere; }
.cn-footer h3 { font-size: 14px; font-weight: 500; letter-spacing: 0; line-height: 1.6; margin: 0 0 12px; color: #f5f3ef; }
.cn-footer nav { display: flex; flex-direction: column; gap: 0; align-items: flex-start; }
.cn-footer nav a { display: block; width: fit-content; min-height: 44px; padding: 9px 0; font-size: 13px; font-weight: 400; line-height: 1.9; color: #ccc7bc; overflow-wrap: anywhere; }
.cn-footer a:hover { color: #fff; text-decoration: underline; text-underline-offset: 4px; }
.cn-footer .cn-research-links { margin-top: 12px; font-size: 13px; }
.cn-footer .cn-research-links summary { cursor: pointer; min-height: 44px; padding: 10px 0; line-height: 1.8; }
.cn-footer .cn-research-links nav { padding-left: 12px; }
.cn-footer .cn-footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px 24px; border-top: 1px solid #ffffff26; margin-top: 40px; padding-top: 18px; font-size: 12px; line-height: 1.8; color: #b8b3a8; }
.cn-footer .cn-footer-bottom > div { display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; }
.cn-footer .cn-footer-bottom a { display: inline-flex; align-items: center; min-height: 44px; }
.cn-footer .cn-security-record { gap: 6px; white-space: nowrap; }
.cn-footer .cn-security-record img { width: 20px; height: 20px; object-fit: contain; flex-shrink: 0; }
.cn-footer .footer-invitation { display: flex; justify-content: space-between; align-items: center; gap: 24px; border-bottom: 1px solid #ffffff26; margin: 0 0 40px; padding: 0 0 36px; }
.cn-footer .footer-invitation h2 { font-size: clamp(26px, 2.6vw, 36px); font-weight: 500; line-height: 1.35; letter-spacing: -.015em; color: #f5f3ef; }
.cn-footer .footer-invitation .eyebrow { color: #ccc7bc; font-size: 13px; font-weight: 400; margin: 0 0 16px; }
.cn-footer .footer-invitation .button { flex-shrink: 0; color: #f5f3ef; background: transparent; border: 0; border-bottom: 1px solid #aaa59b; border-radius: 0; padding: 10px 0; min-height: 44px; font-size: 14px; font-weight: 400; }


.cn-footer { font-family:Arial,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;line-height:1.6;text-align:left;display:block;max-width:none;width:100%;margin:0;box-sizing:border-box; }
.cn-footer *, .om-cloud-site-menu * { box-sizing:border-box; }
.cn-footer a { text-decoration:none; }
.cn-footer a:focus-visible,.cn-footer summary:focus-visible { outline:3px solid #9e8764;outline-offset:4px; }
@media(max-width:760px){.cn-footer{padding-top:44px}.cn-footer .cn-footer-grid{grid-template-columns:1fr 1fr;gap:30px 24px}.cn-footer .cn-footer-brand{grid-column:1/-1}}
.om-cloud-site-menu { position:fixed;inset:0;width:min(780px,calc(100vw - 24px));max-height:calc(100dvh - 24px);margin:auto;padding:0;border:1px solid #dcd8d0;border-radius:0;overflow:auto;background:#fff;color:#30302d;font:400 14px/1.6 Arial,"PingFang SC","Microsoft YaHei",sans-serif;box-shadow:0 16px 70px #0003; }
.om-cloud-site-menu:not([open]){display:none}
.om-cloud-site-menu::backdrop{background:#23242088}
.om-cloud-menu-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 6%;border-bottom:1px solid #dcd8d0}
.om-cloud-menu-head strong{font-size:22px;font-weight:500;letter-spacing:-.025em}
.om-cloud-menu-head .om-cloud-menu-close{display:grid;place-items:center;flex:none;margin:0;padding:0;width:44px;min-width:44px;height:44px;min-height:44px;border:0;border-radius:0;background:transparent;color:#30302d;font:400 28px/1 Arial,sans-serif}
.om-cloud-menu-nav{display:grid;grid-template-columns:1fr 1fr;gap:0 24px;padding:16px 6% 24px}
.om-cloud-menu-nav a{display:flex;align-items:center;min-height:44px;padding:9px 0;border-bottom:1px solid #dcd8d0;color:#30302d;text-decoration:none;font-size:15px;line-height:1.6}
.om-cloud-menu-nav a:hover{text-decoration:underline;text-underline-offset:4px}
.om-cloud-menu-button{display:grid;place-items:center;flex:none;width:36px;height:36px;min-height:36px;margin:0;padding:6px;border:0;border-radius:0;background:transparent;color:#30302d}
.om-cloud-menu-button svg{display:block}
.om-cloud-menu-button:focus-visible,.om-cloud-menu-close:focus-visible,.om-cloud-menu-nav a:focus-visible{outline:3px solid #9e8764;outline-offset:3px}
.start-learning{display:flex;align-items:center;flex-wrap:wrap;gap:10px 16px;margin-top:18px}.start-learning button{min-height:44px;border:0;border-radius:7px;background:var(--green);color:#fff;padding:10px 18px}.start-learning span{font-size:13px;color:var(--muted)}
@media(max-width:600px){.environment-grid{grid-template-columns:1fr;gap:10px}.environment{display:grid;grid-template-columns:20px minmax(0,1fr);column-gap:12px;min-height:108px;padding:18px}.environment.active{padding:17px}.environment .env-icon{grid-column:1;grid-row:1/3;margin:3px 0 0}.environment .env-name{grid-column:2;font-size:16px;padding-right:70px;letter-spacing:0}.environment .env-description{grid-column:2;font-size:12px;line-height:1.7;padding:0}.environment .env-state{font-size:9px;top:16px;right:14px}}
/* ARTS Lab family: shared warm paper, charcoal navigation and clear hierarchy. */
.header{height:88px;gap:24px}.header .brand-arts{flex:none}.header .brand-arts img{width:128px;height:50px;object-fit:contain}.header .lab-header-nav{gap:22px;font-size:13px;white-space:nowrap}.lab-header-nav a[aria-current=page]{text-decoration:underline;text-underline-offset:7px}.lab-header-actions{display:flex;align-items:center;gap:16px;margin-left:auto;white-space:nowrap;font-size:12px}.lab-header-actions a{display:inline-flex;align-items:center;min-height:44px}.lab-header-actions .om-cloud-menu-button{display:none}.lab-breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px 14px;font-size:12px;color:var(--muted);padding:0 0 30px}.lab-breadcrumb a{min-height:24px;display:inline-flex;align-items:center}.lab-breadcrumb a:hover{text-decoration:underline}.workbench,.tutor,.environment,.environment.active{border-radius:0;box-shadow:none}.start-learning button{border-radius:0;background:#30302d}.eyebrow{color:#68665f}.connection{background:#eeece5;color:#5e6254}.tutor-launcher{background:#30302d}
@media(max-width:1200px){.header .lab-header-nav{display:none}.lab-header-actions .om-cloud-menu-button{display:grid}}
@media(max-width:600px){.header{height:76px;padding:0 16px;gap:14px}.header .brand-arts img{width:105px;height:42px}.lab-header-actions{gap:8px;font-size:11px}.lab-header-actions>a:first-child{display:none}.lab-breadcrumb{padding-bottom:24px;gap:6px 10px;font-size:11px}}