/* A narrow permanent rail opens into an editorial navigation panel. */
:root{--nav-rail-width:72px;--nav-drawer-width:clamp(340px,43vw,620px)}
.site-rail-layout{padding-left:var(--nav-rail-width);box-sizing:border-box}
.site-header.site-rail{--nav-bg:var(--m-bg,#10100e);--nav-text:var(--m-text,#f3edde);--nav-gold:var(--m-gold,#cfb17a);--nav-border:var(--m-border,#c8a76b38);inset:0 auto 0 0!important;width:var(--nav-rail-width);height:100dvh!important;padding:0!important;display:block;z-index:100;background:var(--nav-bg);color:var(--nav-text);border:0;border-right:1px solid var(--nav-border);backdrop-filter:none;transform:none;transition:none}
.site-rail-controls{position:relative;z-index:3;height:100%;display:flex;align-items:center;flex-direction:column;justify-content:space-between;background:var(--nav-bg);padding:22px 0 20px;border-right:1px solid var(--nav-border);box-sizing:border-box}
.site-header.site-rail .site-rail-controls button{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:10px;min-width:48px;min-height:48px;padding:0;border:0;background:none;color:var(--nav-gold);cursor:pointer}
.site-crest-toggle img{width:40px;height:40px;object-fit:contain;transition:transform .5s cubic-bezier(.2,.75,.2,1)}
.nav-open .site-crest-toggle img{transform:rotate(-12deg) scale(.95)}
.site-header.site-rail .site-rail-invitation{writing-mode:vertical-rl;transform:rotate(180deg);font:500 11px/1 'DM Sans',sans-serif;letter-spacing:.2em;color:var(--nav-gold);text-decoration:none;padding:20px 15px;white-space:nowrap}
.site-menu-caption{font:600 8px/1 'DM Sans',sans-serif;letter-spacing:.12em}
.site-menu-lines{position:relative;width:22px;height:14px;border-top:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transition:border-color .2s}
.site-menu-lines:before,.site-menu-lines:after{content:'';position:absolute;top:5px;left:0;width:22px;height:1.5px;background:currentColor;transition:transform .35s ease}
.nav-open .site-menu-lines{border-color:transparent}
.nav-open .site-menu-lines:before{transform:rotate(45deg)}
.nav-open .site-menu-lines:after{transform:rotate(-45deg)}
.site-drawer{position:absolute;inset:0 auto 0 var(--nav-rail-width);width:var(--nav-drawer-width);max-width:calc(100vw - var(--nav-rail-width));height:100%;padding:clamp(22px,4dvh,42px) 44px 24px;background:var(--nav-bg);color:var(--nav-text);border-right:1px solid var(--nav-border);display:flex;flex-direction:column;overflow-y:auto;overscroll-behavior:contain;z-index:2;transform:translateX(-105%);visibility:hidden;transition:transform .9s cubic-bezier(.4,0,.2,1),visibility 0s .9s;box-sizing:border-box}
.nav-open .site-drawer{transform:translateX(0);visibility:visible;transition-delay:0s}
.site-nav-kicker{font:500 9px/1.5 'DM Sans',sans-serif;letter-spacing:.2em;color:var(--nav-gold);margin:0 0 20px}
.site-nav-kicker,.site-primary,.site-chapters,.site-nav-signature{flex-shrink:0}
.site-header.site-rail .site-primary{display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;gap:3px;width:100%;backdrop-filter:none}
.site-header.site-rail .site-primary>a{display:block;position:relative;width:fit-content;max-width:100%;padding:3px 0;border:0;font:600 clamp(40px,min(4.5vw,6.8dvh),68px)/1.14 'Barlow Condensed',sans-serif;letter-spacing:-.025em;text-transform:uppercase;text-decoration:none;color:var(--nav-text);transition:color .2s,transform .25s;overflow-wrap:anywhere}
.site-header.site-rail .site-primary>a:hover{color:var(--nav-gold);transform:translateX(9px)}
.site-header.site-rail .site-primary>a[aria-current=page]{color:var(--nav-gold)}
.site-header.site-rail .site-signout{align-self:flex-start;min-height:44px;margin-top:12px;padding:8px 0;border:0;border-top:1px solid var(--nav-border);background:none;color:var(--nav-gold);font:500 12px/1.5 'DM Sans',sans-serif;letter-spacing:.1em;text-transform:uppercase;cursor:pointer}
.site-header.site-rail .site-signout:hover{text-decoration:underline;text-underline-offset:5px}
.site-header.site-rail .site-signout:disabled{opacity:.5;cursor:wait}
.site-header.site-rail [hidden]{display:none!important}
.site-header.site-rail a:focus-visible,.site-header.site-rail button:focus-visible{outline:2px solid var(--nav-gold);outline-offset:5px}
.site-chapters{margin-top:22px;border-top:1px solid var(--nav-border);padding-top:14px}
.site-header.site-rail .site-chapters-toggle{width:100%;display:flex;align-items:center;justify-content:space-between;gap:15px;min-height:44px;background:none;border:0;padding:0;color:var(--nav-gold);font:500 10px/1.5 'DM Sans',sans-serif;letter-spacing:.13em;cursor:pointer;text-align:left}
.site-chapters-toggle>span{font-size:24px;font-weight:300}
.site-header.site-rail .site-chapter-links{display:flex;flex-direction:column;align-items:stretch;gap:0;padding:10px 0 4px;width:100%;backdrop-filter:none}
.site-header.site-rail .site-chapter-links a{font:400 13px/1.5 'DM Sans',sans-serif;color:var(--nav-text);display:flex;gap:16px;align-items:baseline;padding:10px 0;border:0;text-decoration:none;text-transform:none;letter-spacing:0}
.site-header.site-rail .site-chapter-links a:hover{color:var(--nav-gold)}
.site-chapter-links a>span:first-child{color:var(--nav-gold)}
.site-nav-signature{margin-top:auto;padding-top:22px;text-align:right}
.site-header.site-rail .site-nav-signature .site-brand{display:flex;justify-content:flex-end;gap:0;padding:0;color:var(--nav-gold)}
.site-nav-signature .site-brand img{width:150px;height:150px;object-fit:contain}
.site-nav-signature .site-brand span{display:none}
.site-nav-signature p{margin:12px 0 0;font:500 9px/1.8 'DM Sans',sans-serif;letter-spacing:.06em;color:var(--nav-gold)}
.site-nav-signature p span{font-size:8px;opacity:.72}
.site-nav-backdrop{position:fixed;inset:0 0 0 var(--nav-rail-width);z-index:1;visibility:hidden;pointer-events:none;background:transparent}
.nav-open .site-nav-backdrop{visibility:visible;pointer-events:auto}
.site-rail-layout #stage{left:var(--nav-rail-width)}
.site-rail-layout .progress,.site-rail-layout .reading-progress,.site-rail-layout .m-reading-bar{left:var(--nav-rail-width);right:0;width:auto}
.site-rail-layout .m-main{padding-top:80px}
.site-rail-layout .hub-main{padding-top:90px}
.site-rail-layout .hero-content{padding-top:95px}
.site-rail-layout .chapter:first-child .frame{padding-top:90px}
.site-rail-layout .chapter,.site-rail-layout .learning-intro{scroll-margin-top:20px}
/* Isolate the rail from older lesson-specific header and navigation rules. */
.site-header.site-rail>.site-drawer{flex-direction:column;flex-wrap:nowrap;align-items:stretch;justify-content:flex-start;max-width:calc(100vw - var(--nav-rail-width))}
.site-header.site-rail>.site-rail-controls{max-width:none;flex-direction:column;flex-wrap:nowrap;align-items:center;justify-content:space-between}
.site-header.site-rail>.site-nav-backdrop{max-width:none;display:block}
.site-header.site-rail nav{padding:0;max-width:none;overflow:visible}
.site-header.site-rail .site-primary>a{font-size:clamp(40px,min(4.5vw,6.8dvh),68px)!important;white-space:normal}
.site-header.site-rail .site-chapter-links a{font-size:13px!important;white-space:normal}
@media(max-width:700px){
 :root{--nav-rail-width:48px;--nav-drawer-width:calc(100vw - 48px)}
 .site-rail-controls{padding:14px 0 16px}
 .site-header.site-rail .site-rail-controls button{min-width:44px}
 .site-crest-toggle img{width:34px;height:34px}
 .site-header.site-rail .site-rail-invitation{font-size:9px;letter-spacing:.17em;padding:15px 12px}
 .site-menu-lines{width:18px}.site-menu-lines:before,.site-menu-lines:after{width:18px}
 .site-menu-caption{font-size:7px}
 .site-drawer{padding:28px 25px 26px}
 .site-nav-kicker{font-size:8px;margin-bottom:23px}
 .site-header.site-rail .site-primary>a{font-size:clamp(38px,10vw,62px)!important;line-height:1.12;padding:5px 0}
 .site-nav-signature{padding-top:30px}.site-nav-signature .site-brand img{width:120px;height:120px}
 .site-rail-layout .m-main{padding:55px 6% 65px}
 .site-rail-layout .hub-main{padding-top:60px}
 .site-rail-layout .chapter:first-child .frame{padding-top:70px}
 .site-rail-layout .m-heading h1{font-size:clamp(45px,12vw,72px);overflow-wrap:anywhere}
 .site-rail-layout .hero-content{padding-top:75px}
 .site-rail-layout .reading-progress{gap:10px;font-size:7px}
 .site-rail-layout .reading-progress #chapter-label{min-width:120px}
}
@media(prefers-reduced-motion:reduce){.site-crest-toggle img,.site-menu-lines,.site-menu-lines:before,.site-menu-lines:after{transition:none!important}.site-header.site-rail .site-primary>a{transition:none}}
@media print{.site-header.site-rail{display:none!important}.site-rail-layout{padding-left:0}}