/* H.OS stage.css: centered chapter head, generous reading space and a wide visual stage.
   Five chapters follow the existing research cards; styles stay scoped to this area. */
.hc-chapters{background:#f8f6f1;color:#1a2238}
.hc-chapters-anchor{height:0;scroll-margin-top:90px}
.hc-chapter{padding:clamp(80px,10vw,144px) 40px 72px;scroll-margin-top:80px}
.hc-chapter:nth-of-type(even){background:#f0ede6}
.hc-chapter-inner{max-width:1248px;margin:0 auto}
.hc-chapter-head{max-width:1000px;margin:0 auto clamp(48px,5vw,76px);text-align:center}
.hc-chapter-eyebrow{font-size:13px;line-height:1.5;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:#765b2b;margin:0 0 26px}
.hc-chapter-head h2{font-family:inherit;font-size:clamp(40px,5.3vw,80px);font-weight:600;line-height:1.06;letter-spacing:-.045em;max-width:1000px;margin:0 auto 32px;color:#1a2238;text-wrap:balance}
.hc-chapter-lead{max-width:810px;margin:0 auto;color:#525969;font-size:clamp(19px,1.65vw,24px);line-height:1.6;text-wrap:pretty}
.hc-chapter-link{display:inline-flex;align-items:center;gap:12px;min-height:44px;margin-top:25px;color:#765b2b;font-size:17px;font-weight:600;text-decoration:none;text-underline-offset:6px}
.hc-chapter-link:hover{text-decoration:underline}.hc-chapter-link span{transition:transform .2s}.hc-chapter-link:hover span{transform:translate(2px,-2px)}
.hc-chapter-stage{margin:0;border-radius:24px;overflow:hidden;background:#e5e0d2;box-shadow:0 24px 70px -40px #18253680}
.hc-chapter-stage img{display:block;width:100%;height:auto;aspect-ratio:1672/941;object-fit:cover}
.hc-chapter-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px;margin:38px 0 22px}
.hc-chapter-points>div{border-top:1px solid #1a223829;padding-top:20px}
.hc-chapter-points h3{font-size:19px;line-height:1.3;font-weight:600;color:#1a2238;margin:0 0 10px;letter-spacing:-.015em}
.hc-chapter-points p{font-size:17px;line-height:1.65;color:#525969;margin:0}
.hc-chapter-back{display:inline-flex;align-items:center;gap:10px;min-height:44px;font-size:14px;color:#525969;text-decoration:none}.hc-chapter-back:hover{text-decoration:underline;text-underline-offset:4px}
.hc-card-detail{display:inline-flex;align-items:center;gap:12px;min-height:44px;margin-top:24px;font-size:17px;color:#eee0c4;text-decoration:none;font-weight:600}.hc-card-detail:hover{text-decoration:underline;text-underline-offset:5px}
.hc-chapter a:focus-visible,.hc-card-detail:focus-visible{outline:2px solid currentColor;outline-offset:5px;border-radius:3px}
.hc-chapter-stage.is-entering{animation:hc-chapter-in .75s cubic-bezier(.16,1,.3,1) both}
@keyframes hc-chapter-in{from{opacity:.55;transform:translateY(20px)}to{opacity:1;transform:none}}
@media(max-width:700px){.hc-chapter{padding:76px 24px 48px;scroll-margin-top:68px}.hc-chapter-head{margin-bottom:36px}.hc-chapter-head h2{font-size:clamp(34px,8.7vw,52px);line-height:1.1;margin-bottom:25px}.hc-chapter-head h2 br{display:none}.hc-chapter-eyebrow{font-size:11px;margin-bottom:22px;letter-spacing:.075em}.hc-chapter-lead{font-size:18px;line-height:1.65}.hc-chapter-link{font-size:16px;margin-top:20px}.hc-chapter-stage{border-radius:16px}.hc-chapter-points{grid-template-columns:1fr;gap:22px;margin-top:28px}.hc-chapter-points h3{font-size:18px}.hc-chapter-points p{font-size:16px}.hc-card-detail{font-size:16px;margin-top:20px}}
@media(prefers-reduced-motion:reduce){.hc-chapter-stage.is-entering{animation:none}.hc-chapter-link span{transition:none}}
/* Each research chapter has its own visual argument: workspace, brief, chain, route, market. */
.hc-chapter{overflow:hidden}.hc-chapter-stage{isolation:isolate}.hc-ui-top{display:flex;justify-content:space-between;align-items:center;gap:16px;font-size:10px;letter-spacing:.09em;color:#7b8594}.hc-status{display:inline-flex;align-items:center;gap:7px;font-size:11px;letter-spacing:0;color:#47624e}.hc-status:before{content:'';width:6px;height:6px;background:#7c9b75;border-radius:50%;flex-shrink:0}.hc-ui-label{font-size:10px;letter-spacing:.12em;color:#8b7446}.hc-ui-tags{display:flex;justify-content:center;flex-wrap:wrap;gap:5px}.hc-ui-tags span{font-size:10px;border:1px solid #a8874a40;border-radius:20px;padding:5px 7px}
.hc-desk{display:grid;grid-template-columns:180px 1fr;border:1px solid #d8d3c8;background:#f0ece2;box-shadow:0 36px 80px -40px #18253650}.hc-desk-nav{background:#20251f;color:#e9e8df;padding:32px 18px;display:flex;flex-direction:column;gap:10px}.hc-desk-nav>b{font-size:32px;letter-spacing:-.04em;font-weight:500;margin:0 10px 26px}.hc-desk-nav b span{display:block;font-size:8px;letter-spacing:.14em;margin-top:8px;color:#b8bbaa}.hc-desk-nav>span{font-size:12px;padding:12px 10px;color:#bdbfb5}.hc-desk-nav .hc-nav-active{background:#ffffff12;color:#eee1bb;border-radius:8px}.hc-desk-nav>small{margin-top:auto;padding-top:40px;font-size:9px;color:#b8bbaa}.hc-desk-main{padding:30px}.hc-desk-main>h3{font-size:36px;line-height:1.1;font-weight:500;letter-spacing:-.035em;margin:28px 0;color:#252d29}.hc-evidence-grid{display:grid;grid-template-columns:1fr 1.1fr 1fr;gap:12px}.hc-evidence-grid article{background:#faf8f2;padding:22px 18px;border-radius:14px}.hc-evidence-grid h4{font-size:16px;letter-spacing:-.025em;margin:15px 0 22px;color:#252d29}.hc-evidence-grid article>p{font-size:12px;border-top:1px solid #252d2917;padding:13px 0;margin:0;color:#596258}.hc-evidence-grid small{display:block;font-size:10px;line-height:1.5;margin-top:5px;color:#778071}.hc-evidence-grid .hc-evidence-focus{background:#e4e8da}.hc-orbit{height:140px;position:relative;display:grid;place-items:center;margin:-5px 0 14px}.hc-orbit i{position:absolute;width:126px;height:126px;border:1px solid #8f9b7980;border-radius:50%}.hc-orbit i:nth-child(2){width:90px;height:90px}.hc-orbit i:nth-child(3){width:126px;height:50px;transform:rotate(-35deg)}.hc-orbit b{font-size:13px;line-height:1.3;text-align:center;background:#e4e8da;padding:10px;z-index:1;font-weight:500;color:#435341}.hc-desk-footer{display:flex;justify-content:space-between;gap:16px;margin-top:25px;padding-top:18px;border-top:1px solid #1a22381f}.hc-desk-footer strong{font-size:12px;font-weight:500;color:#435341}
.hc-chapter.hc-policy{background:#171d24;color:#f7f3e9;padding-top:110px;padding-bottom:86px}.hc-policy .hc-chapter-inner{display:grid;grid-template-columns:1.15fr 1fr;align-items:center;column-gap:80px}.hc-policy .hc-chapter-head{margin:0;text-align:left}.hc-policy .hc-chapter-head h2{font-size:clamp(40px,4.5vw,66px);color:#f8f5ed}.hc-policy .hc-chapter-lead{color:#b6bec6;font-size:21px}.hc-policy .hc-chapter-eyebrow,.hc-policy .hc-chapter-link{color:#d3b97e}.hc-policy .hc-chapter-points{grid-column:1/-1;margin-top:65px}.hc-policy .hc-chapter-points h3{color:#f3f0e8}.hc-policy .hc-chapter-points p,.hc-policy .hc-chapter-back{color:#b6bec6}.hc-policy .hc-chapter-points>div{border-color:#ffffff20}.hc-policy-visual{position:relative;background:none;box-shadow:none;overflow:visible;padding:15px 20px}.hc-policy-orbit{position:absolute;inset:18% -12%;border-radius:50%;background:radial-gradient(ellipse,#c0aa7325,transparent 70%);border:1px solid #baa77a15;transform:rotate(-22deg);z-index:-1}.hc-phone{width:340px;max-width:100%;margin:auto;background:#f2eee3;color:#26332f;border:8px solid #0d1117;outline:1px solid #c0bda338;border-radius:46px;padding:26px 24px;box-shadow:0 40px 80px #0005;transform:rotate(3deg)}.hc-phone-island{width:96px;height:22px;background:#0d1117;border-radius:20px;margin:-15px auto 26px}.hc-phone>.hc-ui-label{margin:30px 0 10px}.hc-phone h3{font-size:29px;line-height:1.1;letter-spacing:-.035em;color:#26332f;margin:10px 0 25px}.hc-phone-tabs{display:flex;background:#e4e0d4;padding:4px;border-radius:9px;gap:3px}.hc-phone-tabs button{font-family:inherit;font-size:10px;border:0;background:none;color:#566154;border-radius:6px;min-height:34px;flex:1;cursor:pointer;padding:4px}.hc-phone-tabs button[aria-pressed=true]{background:#faf8f2;color:#273629;box-shadow:0 2px 8px #0001}.hc-phone-tabs button:focus-visible{outline:2px solid #866b37;outline-offset:2px}.hc-policy-response{margin:22px 0;padding:17px;background:#e2e6d8;border-radius:12px;min-height:157px}.hc-policy-response h4{font-size:16px;line-height:1.3;letter-spacing:-.015em;margin:12px 0 8px}.hc-policy-response p{font-size:12px;line-height:1.55;color:#5a6755;margin:0}.hc-policy-timeline{list-style:none;padding:0;margin:24px 0}.hc-policy-timeline li{position:relative;padding:0 0 19px 20px;border-left:1px solid #aaa786;margin-left:3px}.hc-policy-timeline li:before{content:'';position:absolute;left:-4px;top:5px;width:7px;height:7px;border-radius:50%;background:#9a8253}.hc-policy-timeline li:last-child{border:0;padding-bottom:0}.hc-policy-timeline b{display:block;font-size:12px;font-weight:600}.hc-policy-timeline span{display:block;font-size:10px;line-height:1.5;color:#7a8071;margin-top:5px}.hc-demo-caption{font-size:9px;color:#7a8071}
.hc-trade .hc-chapter-head{display:grid;grid-template-columns:1.25fr 1fr;text-align:left;max-width:none;gap:0 60px}.hc-trade .hc-chapter-eyebrow{grid-column:1/-1}.hc-trade .hc-chapter-head h2{grid-row:2/4;font-size:clamp(40px,4vw,60px);margin:0}.hc-trade .hc-chapter-lead{font-size:20px}.hc-trade-board{padding:38px;background:#1e2c34;color:#d9e3df;border:1px solid #70867c55}.hc-trade-board .hc-ui-top{color:#adc0b6}.hc-chain{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:42px 0;border-bottom:1px solid #c4d2c626}.hc-chain>div{flex:1}.hc-chain span{display:block;font-size:12px;color:#cbb782;margin-bottom:16px}.hc-chain b{display:block;font-size:31px;font-weight:500;letter-spacing:-.03em;color:#f3f1e9}.hc-chain small{display:block;color:#adbbb7;font-size:13px;margin-top:8px}.hc-chain>i{font-size:32px;font-style:normal;color:#9fbaaa}.hc-trade-question{display:flex;align-items:center;justify-content:space-between;gap:30px;margin:30px 0}.hc-trade-question>span{font-size:10px;letter-spacing:.12em;color:#a9bab2}.hc-trade-question h3{font-size:25px;font-weight:500;letter-spacing:-.025em;line-height:1.3;color:#efece2;margin:0}.hc-comparison{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.hc-comparison>div{background:#ffffff09;border:1px solid #ffffff15;border-radius:12px;padding:22px}.hc-comparison b{display:block;font-size:16px;font-weight:500;color:#dcc695;margin-bottom:18px}.hc-comparison span{display:block;font-size:12px;margin:10px 0;color:#b4c4bd}.hc-board-note{font-size:12px;color:#afc1b7;margin:24px 0 0}
.hc-chapter.hc-energy{position:relative;background:#162730;color:white;padding-top:100px;min-height:850px}.hc-energy .hc-chapter-inner{position:relative;z-index:1;display:flex;flex-direction:column;min-height:720px}.hc-energy .hc-chapter-stage{position:absolute;z-index:-2;inset:-100px calc((min(1248px,100vw - 80px) - 100vw)/2) -72px;border-radius:0;box-shadow:none;background:#162730}.hc-energy .hc-chapter-stage:after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#0a1922ed 0%,#10253288 62%,#10253230),linear-gradient(0deg,#0a1823dd,transparent 60%)}.hc-energy .hc-chapter-stage img{width:100%;height:100%;object-fit:cover;aspect-ratio:auto}.hc-energy .hc-chapter-head{text-align:left;margin:0;max-width:700px}.hc-energy .hc-chapter-head h2{color:#f9f6ef;font-size:clamp(40px,4.8vw,70px)}.hc-energy .hc-chapter-lead{font-size:21px;color:#d1d8db;max-width:610px}.hc-energy .hc-chapter-eyebrow,.hc-energy .hc-chapter-link{color:#e1ca95}.hc-energy .hc-chapter-points{margin-top:auto;padding-top:75px;max-width:1050px}.hc-energy .hc-chapter-points>div{border-color:#ffffff40}.hc-energy .hc-chapter-points h3{color:#f4f1e8}.hc-energy .hc-chapter-points p,.hc-energy .hc-chapter-back{color:#c8d2d8}.hc-energy .hc-chapter-stage.is-entering{animation:none}
.hc-market .hc-chapter-inner{display:grid;grid-template-columns:1.05fr 1fr;gap:0 70px;align-items:center}.hc-market .hc-chapter-stage{grid-column:1;grid-row:1/3;border-radius:4px 80px 4px 4px;height:710px;box-shadow:none}.hc-market .hc-chapter-stage img{height:100%;aspect-ratio:auto;object-position:38% center}.hc-market .hc-chapter-head{grid-column:2;grid-row:1;text-align:left;margin:0}.hc-market .hc-chapter-head h2{font-size:clamp(40px,4.3vw,64px)}.hc-market .hc-chapter-lead{font-size:20px}.hc-market .hc-chapter-points{grid-column:2;display:block;margin-top:30px}.hc-market .hc-chapter-points>div{padding:16px 0}.hc-market .hc-chapter-points h3{font-size:17px;margin-bottom:4px}.hc-market .hc-chapter-points p{font-size:15px}.hc-market .hc-chapter-back{grid-column:2}
@media(max-width:1000px){.hc-desk{grid-template-columns:140px 1fr}.hc-desk-main{padding:24px}.hc-evidence-grid{gap:8px}.hc-evidence-grid article{padding:16px 12px}.hc-policy .hc-chapter-inner{gap:40px}.hc-market .hc-chapter-inner{gap:35px}.hc-market .hc-chapter-stage{height:780px}}
@media(max-width:700px){.hc-desk{grid-template-columns:1fr}.hc-desk-nav{display:none}.hc-desk-main{padding:20px}.hc-desk-main>h3{font-size:29px}.hc-evidence-grid{grid-template-columns:1fr}.hc-evidence-grid article{padding:20px}.hc-evidence-grid h4{margin-bottom:12px}.hc-evidence-grid article>p{padding:10px 0}.hc-desk-footer{flex-direction:column}.hc-policy .hc-chapter-inner,.hc-market .hc-chapter-inner{display:flex;flex-direction:column;gap:0;align-items:stretch}.hc-chapter.hc-policy{padding-top:76px;padding-bottom:48px}.hc-policy .hc-chapter-head h2,.hc-market .hc-chapter-head h2,.hc-trade .hc-chapter-head h2,.hc-energy .hc-chapter-head h2{font-size:38px}.hc-policy .hc-chapter-lead,.hc-market .hc-chapter-lead,.hc-trade .hc-chapter-lead,.hc-energy .hc-chapter-lead{font-size:18px}.hc-policy-visual{padding:50px 10px 10px}.hc-phone{transform:none;width:100%}.hc-policy .hc-chapter-points{margin-top:36px}.hc-trade .hc-chapter-head{display:block}.hc-trade .hc-chapter-head h2{margin-bottom:24px}.hc-trade-board{padding:22px}.hc-trade-board .hc-ui-top{font-size:8px;gap:12px;align-items:start}.hc-chain{gap:8px;padding:28px 0}.hc-chain b{font-size:18px}.hc-chain small{font-size:10px;line-height:1.4}.hc-chain>i{font-size:18px}.hc-trade-question{display:block}.hc-trade-question h3{font-size:24px;margin-top:15px}.hc-comparison{grid-template-columns:1fr}.hc-board-note{line-height:1.5}.hc-chapter.hc-energy{min-height:0;padding-top:76px}.hc-energy .hc-chapter-inner{min-height:0}.hc-energy .hc-chapter-stage{inset:-76px -24px -48px}.hc-energy .hc-chapter-stage:after{background:linear-gradient(90deg,#0a1922eb,#102532a6)}.hc-energy .hc-chapter-points{padding-top:38px}.hc-market .hc-chapter-stage{height:420px;order:1;margin-top:32px;border-radius:4px 50px 4px 4px}.hc-market .hc-chapter-points{order:2}.hc-market .hc-chapter-back{order:3}}
.hc-policy-visual{overflow:hidden;padding:25px 20px}.hc-energy .hc-chapter-lead{margin-left:0}.hc-policy .hc-chapter-inner>*{min-width:0}
@media(max-width:700px){.hc-policy-visual{padding:42px 8px 12px}}
/* Small, local feedback complements the once-only H.OS-style entry choreography. */
.hc-chapter-link,.hc-chapter-back{transition:color .2s ease}
.hc-phone-tabs button{transition:background .2s ease,box-shadow .2s ease,transform .2s ease}
.hc-phone-tabs button:active{transform:scale(.96)}
@media(hover:hover) and (prefers-reduced-motion:no-preference){
 .hc-comparison>div{transition:transform .3s ease,border-color .3s ease,background .3s ease}
 .hc-comparison>div:hover{transform:translateY(-4px);border-color:#dcc69570;background:#ffffff0e}
}
@media(prefers-reduced-motion:reduce){.hc-phone-tabs button,.hc-chapter-link,.hc-chapter-back{transition:none}.hc-phone-tabs button:active{transform:none}}
/* NEXBOT + a compact policy brief: one integrated research scene. */
.hc-robot-visual{height:790px;padding:0!important;overflow:hidden;position:relative}
.hc-robot-stage{position:absolute;top:0;left:0;width:100%;height:510px;z-index:1}
.hc-robot-stage canvas{display:block;width:100%;height:100%;outline:none}
.hc-robot-loading{position:absolute;top:45%;left:0;width:100%;text-align:center;font-size:12px;color:#c8b687}
.hc-robot-stage.ready .hc-robot-loading{display:none}
.hc-robot-visual .hc-phone{position:absolute;left:9%;right:5%;bottom:10px;width:auto;max-width:none;margin:0;transform:none;border:1px solid #d4c49642;border-radius:19px;padding:22px;background:#26312ff2;color:#eee9dc;z-index:2;box-shadow:0 20px 60px #0004}
.hc-robot-visual .hc-phone-island,.hc-robot-visual .hc-phone>.hc-ui-label,.hc-robot-visual .hc-phone h3,.hc-robot-visual .hc-policy-timeline{display:none}
.hc-robot-visual .hc-ui-top{color:#c5c9ba;margin-bottom:17px}
.hc-robot-visual .hc-phone-tabs{background:#192220}
.hc-robot-visual .hc-phone-tabs button{color:#c3c8b7;font-size:11px}
.hc-robot-visual .hc-phone-tabs button[aria-pressed=true]{background:#d3c291;color:#222e29}
.hc-robot-visual .hc-policy-response{background:#ffffff06;margin:14px 0 10px;min-height:144px;padding:15px}
.hc-robot-visual .hc-policy-response h4{color:#f3eddc}
.hc-robot-visual .hc-policy-response p{color:#bcc5b5}
.hc-robot-visual .hc-status{color:#b9c8aa}.hc-robot-visual .hc-demo-caption{color:#a8b3a1}
.hc-robot-visual .no3d-msg{padding-top:150px;text-align:center;color:#d3c291;font-size:30px}
@media(max-width:700px){.hc-robot-visual{height:710px;margin-top:25px}.hc-robot-stage{height:415px}.hc-robot-visual .hc-phone{left:0;right:0;bottom:0;padding:18px}}

/* Editorial refinement: close portrait, restrained metals, a lighter research brief. */
.hc-policy .hc-chapter-inner{grid-template-columns:1fr 1.12fr;column-gap:44px}
.hc-policy .hc-chapter-head h2{font-size:clamp(40px,4.15vw,60px);line-height:1.08;letter-spacing:-.035em}
.hc-policy .hc-chapter-head h2 br{display:none}
.hc-policy .hc-chapter-lead{font-size:19px;line-height:1.65;max-width:490px}
.hc-policy .hc-chapter-eyebrow{font-size:11px;letter-spacing:.1em;margin-bottom:25px}
.hc-robot-visual{height:650px;overflow:hidden}
.hc-robot-stage{top:-8px;left:3%;width:97%;height:580px;mask-image:linear-gradient(to bottom,#000 70%,transparent 98%)}
.hc-robot-visual .hc-policy-orbit{display:none}
.hc-robot-visual .hc-phone{left:auto;right:0;bottom:4px;width:340px;padding:20px 22px;border-radius:16px;background:#253039ed;border:1px solid #aab6bf30;box-shadow:none;backdrop-filter:blur(18px)}
.hc-robot-visual .hc-ui-top{font-size:10px;letter-spacing:.08em;color:#c9cdd0;margin-bottom:14px}
.hc-robot-visual .hc-phone-tabs{background:transparent;padding:0;gap:12px;border-radius:0;border-bottom:1px solid #ffffff18}
.hc-robot-visual .hc-phone-tabs button{border-radius:0;min-height:36px;font-size:11px;color:#bfc6cb;padding:0 0 10px;position:relative}
.hc-robot-visual .hc-phone-tabs button[aria-pressed=true]{background:none;color:#ebd2a1;box-shadow:inset 0 -2px #c2a166}
.hc-robot-visual .hc-policy-response{padding:14px 0 0;background:none;min-height:128px;margin:0 0 10px}
.hc-robot-visual .hc-policy-response h4{font-size:18px;line-height:1.3;font-weight:500;margin:10px 0;color:#f4f0e7;letter-spacing:-.015em}
.hc-robot-visual .hc-policy-response p{font-size:13px;line-height:1.6;color:#c0c8cd}
.hc-robot-visual .hc-status{color:#c0c9c9;font-size:10px}.hc-robot-visual .hc-demo-caption{font-size:9px;color:#aeb7bf}
.hc-policy .hc-chapter-points{margin-top:44px}
@media(max-width:700px){
 .hc-policy .hc-chapter-head h2{font-size:39px;max-width:360px}
 .hc-policy .hc-chapter-lead{font-size:18px}
 .hc-robot-visual{height:590px;margin-top:20px}
 .hc-robot-stage{height:450px;width:112%;left:-6%;top:0}
 .hc-robot-visual .hc-phone{width:100%;left:0;right:0;bottom:0;padding:18px 20px}
}