/* Navigation and search share the existing palette and leave the hero intact. */
.bt-search-dialog .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.top.bt-navigation{display:grid;grid-template-columns:minmax(0,1fr) minmax(210px,280px) minmax(0,1fr);gap:20px;padding:18px 3.5vw;align-items:center;isolation:isolate}
.bt-nav-start,.bt-nav-end,.bt-nav-links{display:flex;align-items:center;gap:25px;min-width:0}
.bt-nav-start{gap:34px}.bt-nav-end{justify-content:flex-end;gap:24px}.bt-nav-links{gap:24px}
.bt-nav-links a,.bt-nav-end>a,.bt-dropdown>summary{font:650 11px/1.3 var(--f-b);letter-spacing:.04em;text-decoration:none;white-space:nowrap;color:var(--text)}
.bt-dropdown{position:relative}.bt-dropdown>summary{display:flex;align-items:center;gap:9px;list-style:none;cursor:pointer;padding:12px 0}.bt-dropdown>summary::-webkit-details-marker{display:none}.bt-dropdown>summary:after{content:'';width:5px;height:5px;border-right:1px solid;border-bottom:1px solid;transform:rotate(45deg);margin-top:-3px;transition:transform .2s}.bt-dropdown[open]>summary:after{transform:rotate(225deg);margin-top:2px}
.bt-nav-panel{position:absolute;top:calc(100% + 10px);left:-20px;width:min(470px,80vw);padding:16px;border:1px solid var(--line);border-radius:20px;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(28px);box-shadow:0 18px 65px #0002;display:grid;grid-template-columns:1fr 1fr;gap:4px}
.bt-nav-panel a{display:block;padding:14px 12px;border-radius:12px;white-space:normal;letter-spacing:0;line-height:1.5}.bt-nav-panel a:hover,.bt-nav-panel a:focus-visible{background:var(--glass-hi)}.bt-nav-panel a>small{display:block;margin-top:4px;font-size:10px;font-weight:400;color:var(--mute)}
.bt-search-trigger{width:100%;border:1px solid var(--line);border-radius:50px;padding:13px 17px;display:flex;align-items:center;gap:10px;background:var(--glass-hi);backdrop-filter:blur(18px);color:var(--text);cursor:pointer;box-shadow:0 3px 20px #00000005;font:600 12px/1.3 var(--f-b);text-align:left;transition:background .2s,transform .2s}
.bt-search-trigger:hover{background:var(--glass);transform:translateY(-1px)}.bt-search-trigger svg{width:16px;height:16px;flex:none}.bt-search-trigger .bt-spark{color:var(--accent);font-size:17px;margin-left:auto}.bt-search-trigger kbd{border:1px solid var(--line);border-radius:5px;font:10px var(--f-b);padding:2px 5px;color:var(--mute)}
.bt-navigation .chap-btn{display:none}.bt-navigation .talk{font-size:11px}.bt-navigation .clients-entry{font-size:10px}
.bt-navigation a:focus-visible,.bt-navigation summary:focus-visible,.bt-search-trigger:focus-visible,.bt-search-dialog :focus-visible{outline:2px solid var(--accent);outline-offset:5px}
.bt-search-dialog{position:fixed;inset:0;z-index:100;overflow:auto;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(32px);color:var(--text);overscroll-behavior:contain;padding:30px clamp(20px,6vw,90px) 60px;box-sizing:border-box}
.bt-search-top{display:flex;align-items:center;justify-content:space-between;max-width:1100px;margin:auto;gap:20px}.bt-search-close{display:flex;align-items:center;gap:15px;cursor:pointer;border:1px solid var(--line);border-radius:50px;padding:12px 19px;background:var(--glass-hi);font:500 12px var(--f-b)}
.bt-search-body{max-width:920px;margin:9vh auto 0}.bt-search-body>h2{font:400 clamp(36px,5vw,66px)/1.08 var(--f-d);letter-spacing:-.05em;margin:10px 0 32px}.bt-search-body .eyebrow{color:var(--accent)}
.bt-search-form{border-bottom:1px solid var(--text);display:flex;align-items:center;gap:20px;padding:0 0 17px}.bt-search-form label{display:block;flex:1;min-width:0}.bt-search-form input{display:block;width:100%;box-sizing:border-box;border:0;border-radius:0;background:transparent;color:var(--text);font:400 clamp(20px,2.3vw,30px)/1.4 var(--f-d);padding:8px 0;outline:none}.bt-search-form input::placeholder{color:var(--mute-2)}
.bt-search-submit{border:1px solid var(--line);border-radius:50px;background:var(--text);color:var(--bg);padding:14px 20px;white-space:nowrap;font:600 11px var(--f-b);cursor:pointer}.bt-search-submit:disabled{opacity:.45;cursor:wait}
.bt-search-help{font-size:11px;color:var(--mute);margin:14px 0 20px}.bt-search-suggestions{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0 32px}.bt-search-suggestions button{font:500 11px var(--f-b);border:1px solid var(--line);border-radius:40px;padding:9px 15px;background:var(--glass-hi);cursor:pointer}
.bt-search-status{font-size:12px;color:var(--mute);min-height:20px}.bt-search-results{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px 0 28px}.bt-search-card{display:block;padding:23px;border:1px solid var(--line);border-radius:17px;text-decoration:none;color:inherit;background:var(--glass-hi);transition:background .2s,transform .2s}.bt-search-card:hover{background:var(--glass);transform:translateY(-2px)}
.bt-search-card>small{font-size:9px;letter-spacing:.12em;text-transform:uppercase;color:var(--mute)}.bt-search-card>h3{font:500 20px/1.3 var(--f-d);margin:10px 0}.bt-search-card>p{font-size:12px;line-height:1.7;color:var(--mute);margin:0}.bt-search-card>span{display:block;margin-top:18px;font-size:11px;color:var(--text)}
.bt-search-answer{padding:25px 28px;border:1px solid var(--line);border-radius:18px;background:var(--glass-hi);margin:26px 0}.bt-search-answer>small{font:650 10px var(--f-b);letter-spacing:.08em;color:var(--accent)}.bt-search-answer>p{font-size:15px;line-height:1.8;white-space:pre-wrap;margin:12px 0 0}.bt-search-answer>aside{font-size:10px;color:var(--mute);margin-top:16px}
.bt-search-bottom{border-top:1px solid var(--line);padding-top:20px;display:flex;justify-content:space-between;gap:20px;font-size:11px;color:var(--mute)}.bt-search-bottom>a{color:var(--text);text-decoration:none;white-space:nowrap}
@media(min-width:1600px){.bt-nav-start{gap:45px}.bt-nav-links,.bt-nav-end{gap:32px}.bt-nav-links a,.bt-nav-end>a,.bt-dropdown>summary{font-size:12px}}
@media(max-width:1199px){.bt-nav-start{gap:20px}.bt-nav-links,.bt-nav-end{gap:16px}.top.bt-navigation{padding-inline:25px;gap:18px;grid-template-columns:minmax(0,1fr) 230px minmax(0,1fr)}.bt-navigation .wordmark{font-size:1.15rem}.bt-nav-end .talk{display:none}}
@media(max-width:999px){.bt-nav-links,.bt-nav-end>.bt-desktop-link{display:none}.bt-navigation .chap-btn{display:flex}.bt-navigation .chap-btn .mono,.bt-navigation .chap-btn .nm{display:none}.bt-navigation .chap-btn{padding:10px 13px}.bt-nav-end{gap:15px}.top.bt-navigation{grid-template-columns:minmax(0,1fr) 230px minmax(0,1fr)}.bt-search-body{margin-top:7vh}}
@media(max-width:600px){.top.bt-navigation{grid-template-columns:1fr 1fr;padding:15px 20px;gap:14px}.bt-nav-start{grid-column:1;grid-row:1}.bt-nav-end{grid-column:2;grid-row:1}.bt-search-trigger{grid-column:1/-1;grid-row:2;padding:12px 17px;max-width:420px;justify-self:center}.bt-search-trigger kbd{display:none}.bt-search-dialog{padding:20px 20px 35px}.bt-search-body{margin-top:7vh}.bt-search-body>h2{margin-bottom:24px}.bt-search-form{flex-wrap:wrap;gap:10px}.bt-search-form label{flex-basis:100%}.bt-search-submit{padding:12px 17px}.bt-search-results{grid-template-columns:1fr}.bt-search-card{padding:20px}.bt-search-bottom{flex-wrap:wrap}.bt-search-answer{padding:20px}.bt-search-close{padding:10px 15px}.bt-search-close>span{display:none}}
@media(prefers-reduced-motion:reduce){.bt-search-trigger,.bt-search-card,.bt-dropdown>summary:after{transition:none}.bt-search-card:hover,.bt-search-trigger:hover{transform:none}}