/* Persistent presentation header. Single-owner stylesheet (v155 cleanup). */
.presentation-header{
    position:fixed;z-index:var(--layer-header);top:0;left:0;right:0;width:100vw;height:31px;min-height:31px;
    display:flex;align-items:center;justify-content:space-between;gap:14px;box-sizing:border-box;margin:0;
    padding:0 var(--kub-header-edge);border:0;border-bottom:1px solid rgba(255,255,255,.075);
    background:rgba(13,15,20,.76);box-shadow:0 4px 16px rgba(0,0,0,.10);backdrop-filter:blur(12px);
    color:#d3d7df;pointer-events:auto;cursor:pointer;transform:none
}
.presentation-header,.presentation-header.is-scrolled{
    --kub-page-width:min(calc(100vw - 96px),var(--content-text));
    --kub-header-edge:calc((100vw - var(--kub-page-width))/2 + 42px)
}
.presentation-current-title{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:rgba(255,255,255,.76);font:700 11px/1.15 var(--font-ui);letter-spacing:.005em;pointer-events:none}
.presentation-menu-toggle{flex:0 0 auto;height:27px;min-height:0;max-height:27px;margin:0;padding:0 9px;display:inline-flex;align-items:center;gap:7px;box-sizing:border-box;border:1px solid transparent;border-radius:0;background:transparent;color:#eef0f4;font:600 10px/1 var(--font-ui);cursor:pointer;pointer-events:auto;transition:background .16s ease,border-color .16s ease,color .16s ease}
.presentation-header{isolation:isolate}
.presentation-header::before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;opacity:0;background:linear-gradient(90deg,transparent,rgba(84,183,255,.18) 65%,transparent);transition:opacity .18s ease}
.presentation-header:has(.presentation-menu-toggle:hover)::before,.presentation-header:has(.presentation-menu-toggle:focus-visible)::before{opacity:1}
.presentation-menu-toggle:hover,.presentation-menu-toggle:focus-visible{background:transparent;border-color:transparent;color:#fff}
.presentation-menu-toggle:focus-visible{outline:2px solid currentColor;outline-offset:-2px}
[data-theme="light"] .presentation-header::before{background:linear-gradient(90deg,transparent,rgba(47,114,229,.14) 65%,transparent)}
.presentation-menu-icon{font-size:13px;line-height:1}
.navigation-presentation-surface{box-sizing:border-box;padding:7px;border:1px solid rgba(255,255,255,.10);border-radius:12px;background:rgba(17,19,25,.97);box-shadow:0 24px 70px rgba(0,0,0,.42);color:#d3d7df;backdrop-filter:blur(20px)}
.presentation-menu{display:none;position:fixed!important;z-index:var(--layer-menu);top:31px!important;left:var(--kub-menu-left,auto)!important;right:auto!important;width:min(360px,calc(100vw - 16px));max-width:calc(100vw - 16px);max-height:calc(100vh - 39px);overflow-y:auto;border-radius:0 0 12px 12px;pointer-events:auto;scrollbar-width:thin;scrollbar-color:#30343d #111319;transform:none!important}
.presentation-menu.is-open{display:block}
.presentation-menu::-webkit-scrollbar{width:8px}.presentation-menu::-webkit-scrollbar-track{background:#111319}.presentation-menu::-webkit-scrollbar-thumb{background:#30343d;border:2px solid #111319;border-radius:8px}.presentation-menu::-webkit-scrollbar-thumb:hover{background:#414752}
.navigation-presentation-item{display:flex;align-items:center;gap:9px;width:100%;box-sizing:border-box;padding:9px 10px;border:0;border-radius:8px;background:transparent;color:#d3d7df;text-align:left;text-decoration:none!important;font:500 13px/1.25 var(--font-ui);cursor:pointer;transition:background .14s ease,color .14s ease}
.navigation-presentation-item:hover{background:rgba(84,183,255,.10);color:#fff}.navigation-presentation-item.is-current{background:linear-gradient(90deg,rgba(150,120,255,.13),rgba(84,183,255,.08));color:#fff}.presentation-menu-number{color:#777f8e;font-size:11px;font-weight:600}
html[data-theme="light"] .navigation-presentation-item,html[data-theme="light"] .reveal .navigation-presentation-item{color:var(--text)}
html[data-theme="light"] .navigation-presentation-item:hover,html[data-theme="light"] .navigation-presentation-item.is-current,html[data-theme="light"] .reveal .navigation-presentation-item:hover,html[data-theme="light"] .reveal .navigation-presentation-item.is-current{color:var(--text-strong)}
.presentation-menu-group{margin:0;padding:0}.presentation-menu-group>summary{list-style:none}.presentation-menu-group>summary::-webkit-details-marker{display:none}.presentation-menu-group-toggle{justify-content:flex-start!important;gap:7px!important;color:#d3d7df!important}.presentation-menu-group-chevron{font-size:18px;font-weight:900;line-height:.8;opacity:.92;transform-origin:50% 48%;transition:transform .16s ease}.presentation-menu-group[open] .presentation-menu-group-chevron{transform:rotate(180deg)}
.presentation-menu-submenu{display:grid;gap:2px;margin:2px 0 5px;padding:4px 5px 5px 16px;border-left:1px solid rgba(255,255,255,.10)}.navigation-presentation-subitem{display:block;padding:8px 10px;border-radius:7px;color:#aeb7c4;text-decoration:none;font:500 12px/1.25 var(--font-ui)}.navigation-presentation-subitem:hover,.navigation-presentation-subitem.is-current{background:rgba(84,183,255,.09);color:#fff}
[data-theme="light"] .presentation-menu-submenu{border-left-color:rgba(25,71,125,.12)}[data-theme="light"] .presentation-menu-group-toggle{color:#425f7c!important}
.site-back-home{position:fixed;z-index:var(--layer-back);left:max(14px,env(safe-area-inset-left));top:50%;transform:translateY(-50%);display:inline-flex;align-items:center;gap:7px;padding:9px 12px 9px 9px;border:1px solid rgba(255,255,255,.11);border-radius:12px;background:rgba(14,18,25,.70);backdrop-filter:blur(12px);box-shadow:0 8px 26px rgba(0,0,0,.16);color:#d8dee8;text-decoration:none;font:650 11px/1 var(--font-ui)}.site-back-home[hidden]{display:none!important}.site-back-home span{font:300 26px/.65 var(--font-ui)}.site-back-home b{font:inherit}
.page-slide[data-show-menu="1"] .slide-page{height:calc(100% - 31px - 46px)!important;margin-top:31px!important;margin-bottom:46px!important;padding-top:22px!important}
@media(max-width:768px){
    .presentation-header,.presentation-header.is-scrolled{--kub-header-edge:max(12px,env(safe-area-inset-left));padding-left:max(12px,env(safe-area-inset-left));padding-right:max(8px,env(safe-area-inset-right));cursor:pointer;pointer-events:auto}
    .presentation-current-title{font-size:11px}.presentation-menu-toggle{height:27px;max-height:27px;padding:0 7px}.presentation-menu-toggle>span:first-child{display:none}
    .presentation-menu{top:31px!important;width:min(330px,calc(100vw - 2 * var(--kub-header-edge)));max-width:calc(100vw - 2 * var(--kub-header-edge));max-height:calc(100vh - 38px)}
    .page-slide[data-show-menu="1"] .slide-page{height:calc(100% - 31px - 42px)!important;margin-top:31px!important;margin-bottom:42px!important;padding-top:22px!important}
    .site-back-home{left:max(8px,env(safe-area-inset-left));top:auto;bottom:max(54px,calc(env(safe-area-inset-bottom) + 50px));width:38px;height:38px;padding:0;justify-content:center;border-radius:10px}.site-back-home b{display:none}
}
@media(min-width:1600px){
    .presentation-header,.presentation-header.is-scrolled{height:42px;min-height:42px}.presentation-current-title{font-size:13px}.presentation-menu-toggle{height:36px;max-height:36px;padding:0 12px;font-size:12px}.presentation-menu-icon{font-size:15px}.presentation-menu{top:42px!important;max-height:calc(100vh - 50px)}
    .page-slide[data-show-menu="1"] .slide-page{height:calc(100% - 42px - 56px)!important;margin-top:42px!important;margin-bottom:56px!important}
}


/* #104: one semantic header trigger; label is part of its continuous silhouette. */
.presentation-header { padding: 0; border: 0; background: transparent; backdrop-filter: none; box-shadow: none; }
.presentation-menu-toggle { position: relative; isolation: isolate; width: 100%; height: 100%; min-height: 100%; max-height: none; margin: 0; padding: 6px var(--kub-header-edge) 0; display:grid; grid-template-columns:minmax(0,1fr) auto; align-items:center; column-gap:24px; border: 0; border-radius: 0; background: transparent; font: 600 11px/1.2 var(--font-ui); text-align:left; }
.presentation-menu-toggle::before { content: ''; position: absolute; inset: 0; z-index: -1; background: rgba(13,15,20,.88); backdrop-filter: blur(12px); clip-path: polygon(0 6px, calc(100% - var(--kub-header-edge) - 92px) 6px, calc(100% - var(--kub-header-edge) - 80px) 0, calc(100% - var(--kub-header-edge) + 4px) 0, calc(100% - var(--kub-header-edge) + 16px) 6px, 100% 6px, 100% 100%, 0 100%); }
.presentation-header::before { display: none; }
.presentation-menu-toggle::after { content: ''; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: 0; background: linear-gradient(90deg,transparent,rgba(84,183,255,.18) 65%,transparent); clip-path: polygon(0 6px, calc(100% - var(--kub-header-edge) - 92px) 6px, calc(100% - var(--kub-header-edge) - 80px) 0, calc(100% - var(--kub-header-edge) + 4px) 0, calc(100% - var(--kub-header-edge) + 16px) 6px, 100% 6px, 100% 100%, 0 100%); transition: opacity .18s ease; }
.presentation-menu-toggle:hover::after,.presentation-menu-toggle:focus-visible::after { opacity: 1; }
[data-theme="light"] .presentation-menu-toggle::after { background: linear-gradient(90deg,transparent,rgba(47,114,229,.14) 65%,transparent); }
.presentation-menu-label { position: static; transform: none; display: inline-flex; align-items: center; justify-self:end; align-self:center; gap: 7px; padding: 0; border: 0; background: transparent; white-space: nowrap; line-height:1.15; }
.presentation-menu-toggle .presentation-current-title { display: block; min-width:0; padding-right:0; pointer-events:none; text-align:left; align-self:center; line-height:1.15; }
.presentation-menu-toggle:hover::before { background: rgba(20,25,34,.96); }
.presentation-menu-toggle:focus-visible { outline: 0; }
.presentation-menu-toggle:focus-visible .presentation-menu-label { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 4px; }
[data-theme="light"] .presentation-menu-toggle::before { background: rgba(244,251,253,.96); }
[data-theme="light"] .presentation-menu-toggle:hover::before { background: #fff; }
@media(max-width:768px) {
    .presentation-header,.presentation-header.is-scrolled { --kub-header-edge:17px; padding:0; }
    .presentation-menu-toggle { padding:6px var(--kub-header-edge) 0; height:100%; max-height:none; column-gap:14px; }
    .presentation-menu-toggle .presentation-current-title { display:block; max-width:none; padding-right:0; }
    .presentation-menu-toggle .presentation-menu-label { display:inline-flex; }
}
@media(min-width:1600px) { .presentation-menu-toggle { height:100%;max-height:none;font-size:12px; } }
@media(max-width:768px) {
    .presentation-menu-toggle > .presentation-current-title:first-child { display: block; }
}

@media(max-width:380px){.presentation-header,.presentation-header.is-scrolled{--kub-header-edge:13px}}