/* TheCodexes.com shared study shell (28 Oct 2026)
   One 56px fixed header, quiet non-fixed footer, shared popup. Inter for UI, Instrument Serif for headings. */
@font-face{font-family:"Inter";src:url(/assets/fonts/inter-latin-var_10_28_2026.woff2) format("woff2");font-weight:400 700;font-style:normal;font-display:swap}
@font-face{font-family:"Instrument Serif";src:url(/assets/fonts/instrument-serif-latin-400_10_28_2026.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap}
/* One type system on shell pages: older product CSS still names Manrope, Lora or a monospace face.
   These aliases render those names in Inter, so no page needs a fourth typeface. */
@font-face{font-family:"Manrope";src:url(/assets/fonts/inter-latin-var_10_28_2026.woff2) format("woff2");font-weight:200 800;font-display:swap}
@font-face{font-family:"Lora";src:url(/assets/fonts/inter-latin-var_10_28_2026.woff2) format("woff2");font-weight:400 700;font-display:swap}
@font-face{font-family:"JetBrains Mono";src:url(/assets/fonts/inter-latin-var_10_28_2026.woff2) format("woff2");font-weight:400 700;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/assets/fonts/inter-latin-var_10_28_2026.woff2) format("woff2");font-weight:400 700;font-display:swap}

:root{--tcx-head:56px;--tcx-theme:#0b4a3d;--tcx-ink:#162b27;--tcx-muted:#5b6b66;--tcx-paper:#f8f6f0;--tcx-sheet:#fffdf8;--tcx-rule:#dfe4dc;--tcx-ui:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;--tcx-serif:"Instrument Serif",Georgia,serif;
  /* legacy frame variables still read by product CSS */
  --cx-head:var(--tcx-head);--cx-foot:0px;--cx-theme:var(--tcx-theme)}
html[data-codex-track="step1"]{--tcx-theme:#0c2a4c}
html{scroll-padding-top:calc(var(--tcx-head) + 16px)}
body.tcx-shell{padding-top:var(--tcx-head)!important;padding-bottom:0!important;background-color:var(--tcx-paper);background-image:none;overflow-x:hidden}
body.tcx-shell [id]{scroll-margin-top:calc(var(--tcx-head) + 14px)}

/* ---------- header ---------- */
.tcx-study-head{position:fixed!important;top:0;left:0;right:0;z-index:60;box-sizing:border-box;height:56px;min-height:56px;margin:0;
  padding:0 max(20px,env(safe-area-inset-right)) 0 max(20px,env(safe-area-inset-left));
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;
  background:var(--tcx-paper);border-bottom:1px solid var(--tcx-rule);font-family:var(--tcx-ui);color:var(--tcx-ink)}
.tcx-study-head:empty{display:block}
.tcx-study-head *{box-sizing:border-box}
.tcx-sh-brand{display:inline-flex;align-items:center;gap:10px;min-width:0;color:var(--tcx-ink);text-decoration:none;justify-self:start}
.tcx-sh-emblem{width:26px;height:26px;flex:none;color:var(--tcx-theme)}
.tcx-sh-dot{transform-box:fill-box;transform-origin:center;animation:tcx-dot 6s ease-in-out infinite}
@keyframes tcx-dot{0%,100%{transform:translate(26.4px,22.4px) scale(.55)}50%{transform:translate(26.4px,22.4px) scale(1.1)}}
@media (prefers-reduced-motion:reduce){.tcx-sh-dot{animation:none}}
.tcx-sh-lockup{display:flex;flex-direction:column;line-height:1.1;min-width:0}
.tcx-sh-word{font:500 18px/1.15 var(--tcx-ui);letter-spacing:-.01em;color:var(--tcx-ink);white-space:nowrap}
.tcx-sh-word strong,.tcx-sh-lib strong,.tcx-sh-core{font-weight:700;color:var(--tcx-theme)}
.tcx-sh-motto{font:500 13px/1.25 var(--tcx-ui);color:var(--tcx-muted);white-space:nowrap}

.tcx-sh-track{position:relative;justify-self:center}
.tcx-sh-trackbtn{appearance:none;display:inline-flex;align-items:center;gap:6px;height:36px;padding:0 14px;border:1px solid #c9d3cc;border-radius:999px;background:var(--tcx-sheet);
  color:var(--tcx-ink);font:600 14px/1 var(--tcx-ui);cursor:pointer;white-space:nowrap}
.tcx-sh-trackbtn svg{width:16px;height:16px;color:var(--tcx-muted)}
.tcx-sh-trackbtn:hover{border-color:var(--tcx-theme)}

.tcx-sh-right{display:flex;align-items:center;justify-content:flex-end;gap:6px;justify-self:end;min-width:0}
.tcx-sh-lib{display:inline-flex;align-items:center;height:40px;padding:0 10px;border-radius:10px;color:var(--tcx-ink);font:600 14px/1 var(--tcx-ui);text-decoration:none;white-space:nowrap}
.tcx-sh-lib:hover,.tcx-sh-lib[aria-current="page"]{background:rgba(11,74,61,.07)}
.tcx-sh-search{position:relative;display:flex;align-items:center;margin:0}
.tcx-sh-search input{width:0;opacity:0;padding:0;border:0;height:36px;font:400 14px/1 var(--tcx-ui);color:var(--tcx-ink);background:var(--tcx-sheet);border-radius:999px;transition:width .18s ease,opacity .18s ease,padding .18s ease}
.tcx-sh-search.is-open input{width:min(240px,40vw);opacity:1;padding:0 14px 0 12px;border:1px solid #c9d3cc;margin-left:4px}
.tcx-sh-iconbtn{appearance:none;display:inline-grid;place-items:center;width:40px;height:40px;border:0;border-radius:10px;background:transparent;color:var(--tcx-ink);cursor:pointer}
.tcx-sh-iconbtn svg{width:19px;height:19px}
.tcx-sh-iconbtn:hover{background:rgba(11,74,61,.07)}
.tcx-sh-account{position:relative;display:flex;align-items:center}
.tcx-sh-signin{display:inline-flex;align-items:center;height:36px;padding:0 16px;border-radius:999px;background:var(--tcx-theme);color:#fff!important;font:600 14px/1 var(--tcx-ui);text-decoration:none;white-space:nowrap}
.tcx-sh-avatar{appearance:none;width:34px;height:34px;border-radius:50%;border:0;background:var(--tcx-theme);color:#fff;font:600 14px/1 var(--tcx-ui);cursor:pointer}

.tcx-sh-menu{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%);min-width:260px;padding:6px;background:var(--tcx-sheet);border:1px solid var(--tcx-rule);border-radius:14px;
  box-shadow:0 18px 40px -18px rgba(11,34,27,.35);display:grid;gap:2px;z-index:70}
.tcx-sh-menu[hidden]{display:none}
.tcx-sh-menu-right{left:auto;right:0;transform:none}
.tcx-sh-menu a,.tcx-sh-menu button,.tcx-sh-menu .tcx-sh-soon{appearance:none;white-space:nowrap;box-shadow:none;display:flex;align-items:center;justify-content:space-between;gap:10px;width:100%;min-height:40px;padding:8px 12px;border:0;border-radius:10px;background:transparent;
  color:var(--tcx-ink);font:500 14px/1.3 var(--tcx-ui);text-align:left;text-decoration:none;cursor:pointer}
.tcx-sh-menu a:hover,.tcx-sh-menu button:hover,.tcx-sh-menu a:focus-visible,.tcx-sh-menu button:focus-visible{background:rgba(11,74,61,.07)}
.tcx-sh-menu .tcx-sh-soon{cursor:default;color:var(--tcx-muted)}
.tcx-sh-menu .tcx-sh-soon small{font:500 12px/1 var(--tcx-ui)}
.tcx-sh-check{color:var(--tcx-theme);font-weight:700}
.tcx-sh-who{display:grid;gap:2px;padding:8px 12px 10px;border-bottom:1px solid var(--tcx-rule);margin-bottom:4px;font:400 13px/1.35 var(--tcx-ui);color:var(--tcx-muted);overflow-wrap:anywhere}
.tcx-sh-who strong{font-weight:600;color:var(--tcx-ink);font-size:14px}
.tcx-study-head a:focus-visible,.tcx-study-head button:focus-visible,.tcx-study-head input:focus-visible{outline:2px solid var(--tcx-theme);outline-offset:2px}

@media (max-width:900px){
  .tcx-sh-motto{display:none}
}
@media (max-width:640px){
  .tcx-study-head{grid-template-columns:auto minmax(0,1fr) auto;gap:8px;padding-inline:max(14px,env(safe-area-inset-left))}
  .tcx-sh-word{display:none}
  .tcx-sh-tl-long{display:none}
  .tcx-sh-track{justify-self:start;min-width:0}
  .tcx-sh-trackbtn{height:34px;padding:0 10px;font-size:13px}
  .tcx-sh-lib{padding:0 6px;font-size:13px}
  .tcx-sh-signin{padding:0 12px;font-size:13px}
  .tcx-sh-search.is-open{position:absolute;right:0;top:-2px;z-index:2;background:var(--tcx-paper)}
  .tcx-sh-search.is-open input{width:min(220px,calc(100vw - 120px))}
}
@media (max-width:380px){.tcx-sh-lib{display:none}}

/* hide legacy chrome if a page still ships it */
body.tcx-shell .codex-frame-foot{display:none!important}

/* page-level secondary navigation (e.g. the ImageBank bank switch), scrolls with the page */
.tcx-subnav{display:flex;justify-content:center;padding:16px max(16px,env(safe-area-inset-left)) 0;font-family:var(--tcx-ui)}
.tcx-subnav .bank-switch{display:inline-flex;gap:4px;padding:4px;border-radius:999px;background:#ecebe3}
.tcx-subnav .bank-tab{display:inline-flex;align-items:center;min-height:36px;padding:0 14px;border-radius:999px;color:var(--tcx-ink)!important;font:600 14px/1 var(--tcx-ui);text-decoration:none;white-space:nowrap;box-shadow:none!important;background:transparent;border:0}
.tcx-subnav .bank-tab:hover{background:rgba(11,74,61,.08)}
.tcx-subnav .bank-tab.is-active,.tcx-subnav .bank-tab[aria-current="page"]{background:var(--tcx-sheet);color:var(--tcx-theme)!important}
.tcx-subnav .bank-short{display:none}
@media (max-width:520px){.tcx-subnav .bank-long{display:none}.tcx-subnav .bank-short{display:inline}}

/* ---------- quiet footer (not fixed) ---------- */
.tcx-study-foot{position:static!important;margin:56px 0 0;padding:20px max(20px,env(safe-area-inset-left)) max(20px,env(safe-area-inset-bottom));background:#f1efe7;color:var(--tcx-muted);font:400 12px/1.5 var(--tcx-ui);
  display:grid;gap:6px;justify-items:center;text-align:center}
.tcx-sf-brand{display:grid;gap:2px;justify-items:center}
.tcx-sf-brand .tcx-sh-word{font-size:20px}
.tcx-sf-motto{font:500 13px/1.3 var(--tcx-ui);color:var(--tcx-muted)}
.tcx-sf-tag{margin:0;font:600 14px/1.4 var(--tcx-ui);color:var(--tcx-ink)}
.tcx-sf-links{display:flex;flex-wrap:wrap;justify-content:center;gap:2px 6px}
.tcx-study-foot .tcx-sf-links>:is(a,button){all:unset;box-sizing:border-box;display:inline-flex;align-items:center;min-height:32px;padding:0 8px;border-radius:8px;color:var(--tcx-ink);font:500 12px/1.3 var(--tcx-ui);cursor:pointer}
.tcx-study-foot .tcx-sf-links>:is(a,button):hover{background:rgba(11,74,61,.07)}
.tcx-study-foot .tcx-sf-links>:is(a,button):focus-visible{outline:2px solid var(--tcx-theme);outline-offset:1px}
.tcx-sf-copy{margin:0;font-size:12px;color:#4d5c57}
.tcx-sf-note{margin:0;max-width:80ch;font-size:12px;line-height:1.5;color:#4d5c57}
.tcx-sf-kept{position:static!important;display:block!important;max-width:68ch;margin:0 0 6px!important;padding:0!important;background:none!important;border:0!important;box-shadow:none!important;font:400 12px/1.5 var(--tcx-ui)!important;color:#4d5c57!important}
.tcx-sf-kept a{color:var(--tcx-ink)}
.tcx-sf-copy strong{color:var(--tcx-theme)}
.tcx-sf-copy a{color:inherit}

/* ---------- shared popup (Credits / Updates / Report / Support) ---------- */
dialog.cx-premium-modal{border:0;border-radius:20px;padding:0;max-width:600px;width:calc(100vw - 28px);max-height:min(86dvh,720px);background:var(--tcx-sheet);color:var(--tcx-ink);
  box-shadow:-4px 4px 0 rgba(22,43,39,.10),0 24px 60px rgba(11,34,27,.24);font-family:var(--tcx-ui);overflow:hidden;margin:auto}
dialog.cx-premium-modal:not([open]){display:none!important}
dialog.cx-premium-modal[open]{display:flex!important;flex-direction:column}
dialog.cx-premium-modal::backdrop{background:rgba(11,30,25,.5)}
.cx-pm-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;padding:22px 24px 14px;background:var(--tcx-paper)}
.cx-pm-brand{display:flex;align-items:center;gap:8px;margin-bottom:6px;font:600 13px/1.3 var(--tcx-ui);color:var(--tcx-theme)}
.cx-pm-brand svg{width:16px;height:16px;flex:none}
.cx-pm-title{margin:0;font:400 30px/1.08 var(--tcx-serif);color:var(--tcx-ink);letter-spacing:-.01em}
.cx-pm-close{appearance:none;border:0;background:rgba(11,74,61,.07);color:var(--tcx-ink);width:40px;height:40px;min-width:40px;border-radius:10px;font-size:20px;line-height:1;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;flex:none}
.cx-pm-close:hover{background:rgba(11,74,61,.14)}
.cx-pm-body{padding:18px 24px 24px;overflow-y:auto;display:grid;gap:14px;font:400 15px/1.6 var(--tcx-ui);color:var(--tcx-ink)}
.cx-pm-card{background:var(--tcx-paper);border-radius:12px;padding:14px 16px}
.cx-pm-card h4{margin:0 0 6px;font:600 15px/1.35 var(--tcx-ui);color:var(--tcx-ink)}
.cx-pm-card p{margin:0;font:400 14.5px/1.6 var(--tcx-ui);color:var(--tcx-ink)}
.cx-pm-card p+p{margin-top:8px}
.cx-pm-badge{display:inline-block;padding:2px 8px;border-radius:999px;background:#e5f0ec;color:var(--tcx-theme);font:600 13px/1.4 var(--tcx-ui);margin-right:6px}
.cx-pm-form{display:grid;gap:12px}
.cx-pm-field{display:grid;gap:5px}
.cx-pm-field label{font:600 14px/1.3 var(--tcx-ui);color:var(--tcx-ink)}
.cx-pm-field input,.cx-pm-field select,.cx-pm-field textarea{width:100%;box-sizing:border-box;padding:10px 12px;border:1px solid #b5c4ba;border-radius:10px;background:#fff;color:var(--tcx-ink);font:400 15px/1.45 var(--tcx-ui)}
.cx-pm-field textarea{min-height:92px;resize:vertical}
.cx-pm-actions{display:flex;align-items:center;justify-content:flex-end;gap:10px;padding-top:6px;flex-wrap:wrap}
.cx-pm-btn{appearance:none;border:1.5px solid var(--tcx-theme);border-radius:10px;min-height:42px;padding:9px 18px;font:600 14px/1.2 var(--tcx-ui);cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px}
.cx-pm-btn.pri{background:var(--tcx-theme);color:#fff!important}
.cx-pm-btn.ghost{background:#fff;color:var(--tcx-theme)!important}
.cx-pm-status{padding:10px 12px;border-radius:10px;font:600 14px/1.45 var(--tcx-ui);display:none}
.cx-pm-status.ok{display:block;background:#e6f4ee;color:var(--tcx-theme)}
.cx-pm-status.err{display:block;background:#fce8e6;color:#9c2b23}
@media (max-width:600px){
  dialog.cx-premium-modal{width:calc(100vw - 18px);max-height:90dvh;border-radius:18px}
  .cx-pm-head{padding:16px 16px 12px}
  .cx-pm-title{font-size:25px}
  .cx-pm-body{padding:14px 16px 18px}
}
@media print{body.tcx-shell{padding:0!important;background:#fff!important}.tcx-study-head,.tcx-study-foot,dialog.cx-premium-modal{display:none!important}
  .tcx-sh-word strong,.tcx-sf-copy strong{color:var(--tcx-theme)!important;-webkit-print-color-adjust:exact;print-color-adjust:exact}}