/* Shared product-level navigation. Research workflow navigation stays in its own sidebar. */
:root{--product-header-height:68px;--product-blue:#3657d6;--product-ink:#192337;--product-muted:#68758a}
.product-header{position:sticky;top:0;z-index:60;height:var(--product-header-height);display:flex;align-items:center;gap:48px;padding:0 32px;background:#fff;color:var(--product-ink);border-bottom:1px solid #e3e8f0;box-sizing:border-box;font:14px/1.5 Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
.product-header a{text-decoration:none;color:inherit}
.product-brand{display:flex;align-items:center;gap:12px;white-space:nowrap;font-size:20px;font-weight:650;letter-spacing:-.5px}
.product-brand svg{width:31px;height:31px;color:var(--product-blue);flex-shrink:0}
.product-navigation{display:flex;align-self:stretch;gap:30px;white-space:nowrap}
.product-navigation a{position:relative;display:flex;align-items:center;color:var(--product-muted);font-size:14px;min-height:44px}
.product-navigation a:hover{color:var(--product-blue)}
.product-navigation a[aria-current=page]{color:var(--product-blue);font-weight:600}
.product-navigation a[aria-current=page]:after{content:"";position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--product-blue)}
.product-account{display:flex;align-items:center;gap:16px;margin-left:auto;white-space:nowrap;font-size:13px}
.product-account-label{color:var(--product-muted);border-right:1px solid #e3e8f0;padding-right:16px}
.product-account-link{display:flex;align-items:center;gap:9px;min-height:44px}
.product-account-link svg{width:24px;height:24px;color:var(--product-blue)}
.product-header :focus-visible,.product-start :focus-visible{outline:2px solid var(--product-blue);outline-offset:4px}
.product-skip{position:fixed;top:-80px;left:16px;z-index:300;padding:12px;background:white;color:var(--product-blue)}
.product-skip:focus{top:8px}
.product-start{margin:0;min-width:320px;background:#fff;color:var(--product-ink);font:16px/1.6 Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
.product-start *{box-sizing:border-box}
.product-start a{text-decoration:none}
.product-start .icon{width:18px;height:18px;vertical-align:middle;flex-shrink:0}
.start-main{max-width:1200px;margin:0 auto;padding:60px 24px 22px}
.start-heading{text-align:center;margin-bottom:42px}
.start-heading p{color:var(--product-muted);margin:0;font-size:18px}
.start-heading p:first-child{font-size:14px;margin-bottom:12px}
.start-heading h1{font-size:38px;line-height:1.3;letter-spacing:-1px;margin:0 0 12px;font-weight:650}
.start-choices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.start-choice{border:1px solid #dbe3fb;border-radius:9px;padding:28px 24px;background:#f8faff;display:flex;flex-direction:column}
.start-choice-ask{border-color:#e0dffa;background:#faf9ff}
.start-choice-icon{display:grid;place-items:center;width:80px;height:80px;border-radius:12px;background:#eaf0ff;color:var(--product-blue);margin-bottom:22px}
.start-choice-ask .start-choice-icon{background:#eeedff}
.start-choice-icon .icon{width:44px;height:44px}
.start-eyebrow{font-size:16px;color:var(--product-muted);margin:0 0 6px}
.start-choice h2{font-size:28px;line-height:1.3;margin:0 0 10px;font-weight:650;letter-spacing:-.5px}
.start-choice:first-child h2{color:#233ba1}
.start-description{margin:0;font-size:16px;line-height:1.8;color:#46536b;min-height:58px}
.start-examples{margin:24px 0 28px;padding-top:12px;border-top:1px solid #e2e7f0;font-size:15px;color:var(--product-muted)}
.start-examples span{margin:0 8px;color:#a6afbd}
.start-primary{display:flex;align-items:center;justify-content:center;gap:14px;max-width:288px;min-height:54px;padding:12px 20px;border-radius:7px;background:#394ec6;color:#fff;font-size:17px;font-weight:500}
.start-primary:hover{background:#2c42b9}
.start-course{display:block;max-width:288px;text-align:center;margin-top:18px;color:#354dc4;font-size:15px;font-weight:600;min-height:28px}
.start-course:hover{text-decoration:underline}
.start-learning{display:flex;align-items:center;gap:20px;margin-top:26px;padding:20px 26px;border:1px solid #e2e7f4;border-radius:9px;color:var(--product-ink);background:#fcfdff}
.start-play{display:grid;place-items:center;width:48px;height:48px;border-radius:50%;background:#eef2ff;color:var(--product-blue);flex-shrink:0}
.start-play .icon{width:22px;height:22px}
.start-learning strong,.start-learning small{display:block}
.start-learning strong{font-size:17px;font-weight:600}
.start-learning small{font-size:14px;color:var(--product-muted)}
.start-learning-action{display:flex;align-items:center;gap:10px;margin-left:auto;color:#354dc4;white-space:nowrap;font-size:15px}
.start-boundary{text-align:center;color:var(--product-muted);font-size:14px;margin:22px 0 16px}
.start-footer{border-top:1px solid #e8ebf2;text-align:center;padding-top:16px;color:#929bad;font-size:14px}
/* Existing Q&A and workbench keep their own inner navigation and state. */
.alchemy-work-computer .shell,.alchemy-work-computer .workspace,.alchemy-work-computer .work-sidebar,.alchemy-work-computer .research-page{height:calc(100dvh - var(--product-header-height))}
.alchemy-work-computer .product-header .icon{width:24px;height:24px}
.alchemy-work-computer .product-brand .icon{width:31px;height:31px}
.alchemy-work-computer .work-brand-row{padding-bottom:12px}
.alchemy-work-computer .work-brand{font-family:inherit!important;font-size:14px!important;font-weight:600;letter-spacing:0}
.alchemy-work-computer .work-course-link{display:flex;gap:7px;align-items:center;font-size:13px;color:#4055b7;white-space:nowrap}
.rw-app .rw-header.product-header{position:sticky;background:white;color:var(--product-ink);gap:36px}
.rw-app .product-header .rw-brand{min-width:0;padding:0;background:none;color:var(--product-ink);font-size:20px}
.rw-app .product-header .rw-logo{width:31px;height:31px;background:none;color:var(--product-blue);border:0}
.rw-app .product-header .rw-logo svg{width:31px;height:31px}
.rw-app .product-header .rw-header-right{margin-left:auto;gap:12px}
.rw-app .product-header .rw-header-right>button,.rw-app .product-header .account-trigger{color:var(--product-muted);background:none}
.rw-app .product-header .account-label small{color:var(--product-muted)}
.rw-app .product-header .account-trigger:hover{background:#f4f6fb}
.rw-app .product-header .header-organization{padding-left:16px;border-left:1px solid #e3e8f0;color:var(--product-muted)}
.rw-app .product-header .header-organization select{background:#f6f8fc;color:var(--product-ink);border:1px solid #e3e8f0}
.rw-app .rw-sidebar{top:var(--product-header-height)}
.rw-app .rw-nav-scrim{top:var(--product-header-height)}
@media(max-width:1200px){.product-header{gap:26px;padding:0 24px}.product-navigation{gap:22px}.start-main{margin:0 7%;padding-top:48px}.start-choice{padding:30px}.start-description{font-size:15px;white-space:normal}.rw-app .product-header{gap:20px}.rw-app .product-header .header-organization{display:none}}
@media(max-width:800px){:root{--product-header-height:106px}.product-header,.rw-app .rw-header.product-header{height:var(--product-header-height);display:flex;flex-wrap:wrap;align-content:center;gap:0 16px;padding:10px 18px 0}.product-brand,.rw-app .product-header .rw-brand{font-size:17px;height:42px}.product-brand svg,.rw-app .product-header .rw-logo{width:26px;height:26px}.product-navigation{order:3;flex-basis:100%;height:44px;justify-content:space-between;gap:12px}.product-navigation a{font-size:13px}.product-account{font-size:12px}.product-account-label{display:none}.product-account-link span{max-width:110px;overflow:hidden;text-overflow:ellipsis}.start-main{margin:0 24px;padding-top:36px}.start-heading{margin-bottom:28px}.start-heading h1{font-size:30px}.start-heading p{font-size:15px}.start-choice{padding:24px}.start-choice h2{font-size:27px}.start-choice-icon{width:60px;height:60px;margin-bottom:20px}.start-choice-icon .icon{width:34px;height:34px}.start-examples{font-size:13px}.start-examples span{margin:0 4px}.start-learning{padding:18px;gap:14px}.start-learning-action{font-size:13px}.rw-app .product-header .rw-nav-toggle{color:var(--product-ink);padding:4px}.rw-app .product-header .rw-header-right{gap:5px}.rw-app .product-header .header-refresh{display:none}.rw-app .product-header .rw-header-right>button[aria-label="查看我的待办"]{display:none}.rw-app .rw-sidebar{top:var(--product-header-height)}.alchemy-work-computer .work-sidebar{top:var(--product-header-height)}.alchemy-work-computer .mobile-drawer-backdrop{top:var(--product-header-height)}}
@media(max-width:560px){.start-main{margin:0 18px;padding-top:30px}.start-choices{grid-template-columns:1fr;gap:16px}.start-choice{padding:25px 28px}.start-choice-icon{width:52px;height:52px;margin-bottom:16px}.start-choice-icon .icon{width:30px;height:30px}.start-primary,.start-course{max-width:none}.start-examples{margin:20px 0}.start-learning{flex-wrap:wrap}.start-learning strong{font-size:15px}.start-learning small{font-size:12px}.start-learning-action{margin-left:62px}.start-boundary{font-size:12px}.start-heading h1{font-size:28px}.start-heading p:last-child{font-size:14px}.alchemy-work-computer .work-course-link{font-size:12px}.rw-app .product-header .brand-desktop{display:inline}.rw-app .product-header .brand-mobile{display:none}}

.work-space-title{font-size:14px;font-weight:600;color:#68758a}.ask-learning-links{display:flex;align-items:center;gap:24px;margin-top:14px}.ask-learning-links>a{display:inline-flex;align-items:center;gap:7px;font-size:14px;color:#4055b7}.ask-learning-links .icon{width:17px!important;height:17px!important}

.product-start .product-brand .icon{width:31px;height:31px}
@media(max-width:800px){.product-start .product-brand .icon{width:26px;height:26px}}
.alchemy-work-computer .research-page.computer-page{height:calc(100dvh - var(--product-header-height))}
.start-choice-operations{background:#f5faf8;border-color:#d8e9e1}.start-choice-operations .start-choice-icon{background:#e5f2ec;color:#287657}.start-choice-operations .start-primary{background:#287657}.start-workspace-note{font-size:13px;color:#68758a;line-height:1.6;margin:14px 0 0}.start-primary[aria-disabled=true]{background:#e6eaf0;color:#69778c;cursor:not-allowed}.start-choice .start-primary{margin-top:auto}@media(max-width:960px){.start-choices{grid-template-columns:1fr}.start-choice{padding:24px 28px}.start-description{min-height:0}.start-choice-icon{width:55px;height:55px}.start-choice-icon .icon{width:30px;height:30px}.start-examples{margin:16px 0}.start-choice .start-primary{margin-top:0}}@media(max-width:800px){.product-navigation{overflow-x:auto;justify-content:flex-start;gap:22px}.product-navigation a{flex-shrink:0}}

/* Keep all three destinations above the long explanations on small screens. */
.start-quick-links{display:none}
@media(max-width:960px){
  .start-quick-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:0 0 24px}
  .start-quick-links a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;min-height:94px;padding:10px 4px;border:1px solid #dbe3f1;border-radius:8px;color:#3149ac;background:#f8faff;text-align:center}
  .start-quick-links strong{font-size:13px;line-height:1.4}
  .start-quick-links small{font-size:11px;line-height:1.5;color:#617086}
  .start-quick-links a[aria-disabled=true]{color:#69778c;background:#f2f4f7;cursor:not-allowed}
}
@media(max-width:800px){
  .product-navigation{overflow:visible;justify-content:space-between;gap:6px;min-width:0}
  .product-navigation a{font-size:12px;flex:0 1 auto;white-space:nowrap;min-width:0}
}
@media(max-width:560px){
  .product-start .start-main{margin:0;padding:24px 16px 22px}
  .product-start .start-heading{margin-bottom:20px}
}