:root{
  --bg:#fbfbfc;--fg:#101114;--muted:#5a5f6a;--hair:rgba(16,17,20,.10);
  --card:rgba(16,17,20,.04);--accent:#2a5bd7;--accent2:#7a3aed;
  --measure:68ch;--radius:14px;--shadow:0 8px 30px rgba(0,0,0,.08);
  --sans:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;
  --serif:ui-serif,Georgia,Cambria,"Times New Roman",Times,serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;
}
:root[data-theme="dark"]{
  --bg:#0b0c10;--fg:#eaecf2;--muted:#a8afbd;--hair:rgba(234,236,242,.14);
  --card:rgba(234,236,242,.06);--accent:#7aa2ff;--accent2:#c4a7ff;
  --shadow:0 12px 44px rgba(0,0,0,.42);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme]){
    --bg:#0b0c10;--fg:#eaecf2;--muted:#a8afbd;--hair:rgba(234,236,242,.14);
    --card:rgba(234,236,242,.06);--accent:#7aa2ff;--accent2:#c4a7ff;
    --shadow:0 12px 44px rgba(0,0,0,.42);
  }
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:var(--sans);background:var(--bg);color:var(--fg);-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:8px}
[hidden]{display:none!important}
.skip{position:absolute;left:-999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip:focus{left:12px;top:12px;width:auto;height:auto;padding:10px 12px;background:var(--bg);border:1px solid var(--hair);border-radius:10px;z-index:1000}

/* Topbar */
.topbar{position:sticky;top:0;z-index:100;backdrop-filter:blur(10px);background:color-mix(in oklab,var(--bg),transparent 18%);border-bottom:1px solid var(--hair)}
.topbar__inner{max-width:1120px;margin:0 auto;padding:14px 18px;display:flex;gap:14px;align-items:center;justify-content:space-between}
.brand__title{font-weight:700;letter-spacing:-0.02em;color:var(--fg)}
.brand__title:hover{text-decoration:none;opacity:.92}
.nav{display:flex;gap:14px;flex-wrap:wrap;align-items:center;justify-content:center}
.nav a{color:var(--fg);opacity:.86;font-size:14px;padding:6px 8px;border-radius:10px}
.nav a[aria-current="page"]{opacity:1;background:var(--card);border:1px solid var(--hair)}
.nav a:hover{text-decoration:none;opacity:1;background:color-mix(in oklab,var(--card),transparent 35%)}
.topbar__actions{display:flex;gap:10px;align-items:center}
.iconbtn{border:1px solid var(--hair);background:var(--card);color:var(--fg);border-radius:999px;padding:8px 10px;cursor:pointer;display:inline-flex;align-items:center;gap:8px}
.iconbtn__dot{width:10px;height:10px;border-radius:999px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:inline-block}
.iconbtn--menu{display:none}
.mobileNav{max-width:1120px;margin:0 auto;padding:0 18px 14px 18px;display:grid;gap:8px}
.mobileNav a{padding:10px 12px;border:1px solid var(--hair);background:var(--card);border-radius:12px;color:var(--fg);opacity:.9}

/* Grid areas */
.rail--left{grid-area:left}
.content{grid-area:content;min-width:0}
.rail--right{grid-area:right}

/* Desktop: 2 columns (left rail + content) */
.layout{max-width:1120px;margin:0 auto;padding:22px 18px 56px 18px;display:grid;grid-template-columns:260px minmax(0,1fr);grid-template-areas:"left content";gap:22px}
.layout--wide{grid-template-columns:260px minmax(0,1fr);grid-template-areas:"left content"}
.rail{position:sticky;top:74px;align-self:start;max-height:calc(100vh - 94px);overflow:auto;padding-right:4px}
.rail__title{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:10px 0 12px 0}
.rail__nav{display:grid;gap:6px;margin-bottom:16px}
.rail__nav a{color:var(--fg);opacity:.84;padding:8px 10px;border-radius:12px;border:1px solid transparent}
.rail__nav a:hover{text-decoration:none;opacity:1;background:var(--card);border-color:var(--hair)}
.rail--right{display:none!important}

/* Tablet-ish: keep left rail + content */
@media (max-width:980px){
  .layout,.layout--wide{grid-template-columns:1fr 1fr;grid-template-areas:"left content";align-items:start}
  .rail{position:relative;top:auto;max-height:none;overflow:visible}
  .rail--right{display:none!important}
  .nav{display:none}
  .iconbtn--menu{display:inline-flex}
}

/* Mobile: left above content; right hidden */
@media (max-width:760px){
  .layout,.layout--wide{grid-template-columns:1fr;grid-template-areas:"left" "content"}
  .rail--right{display:none!important}
  .rail{position:relative;top:auto;max-height:none;overflow:visible}
}

/* Prose */
.prose{max-width:var(--measure)}
.pagehead h1{font-family:var(--serif);letter-spacing:-0.02em;margin:10px 0 10px 0;line-height:1.12;font-size:clamp(30px,4vw,44px)}
.lede{color:var(--muted);font-size:18px;line-height:1.6;margin:0 0 18px 0}
.prose h2,.prose h3{font-family:var(--serif);letter-spacing:-0.01em;margin-top:28px;margin-bottom:10px}
.prose h2{font-size:26px;line-height:1.2}
.prose h3{font-size:20px;line-height:1.25}
.prose p,.prose li{font-size:16px;line-height:1.72}
.prose p{margin:0 0 14px 0}
.prose ul{padding-left:18px}
blockquote{margin:18px 0;padding:14px 16px;border-left:4px solid var(--accent);background:color-mix(in oklab,var(--card),transparent 10%);border-radius:12px;color:color-mix(in oklab,var(--fg),var(--muted) 20%)}
code,pre{font-family:var(--mono)}
pre{padding:14px;border:1px solid var(--hair);background:color-mix(in oklab,var(--card),transparent 10%);border-radius:12px;overflow:auto}

/* UI bits */
.card{border:1px solid var(--hair);border-radius:var(--radius);background:var(--bg);box-shadow:var(--shadow);padding:14px;margin-top:12px}
.card.subtle{box-shadow:none;background:color-mix(in oklab,var(--card),transparent 25%)}
.meta{font-size:12px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin-bottom:8px}
.stack{display:grid;gap:8px}
.muted{color:var(--muted)}
.divider{height:1px;background:var(--hair);margin:22px 0}
.byline{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:14px}
.dot{opacity:.7}
.postlist{display:grid;gap:12px;margin-top:14px}
.postcard{border:1px solid var(--hair);border-radius:var(--radius);background:color-mix(in oklab,var(--card),transparent 12%);padding:14px}
.postcard__title{margin:0 0 6px 0;font-family:var(--serif);letter-spacing:-0.01em;font-size:22px}
.postcard__title a{color:var(--fg);text-decoration:none}
.postcard__title a:hover{text-decoration:underline;text-decoration-thickness:2px}
.postcard__meta{display:flex;flex-wrap:wrap;gap:6px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:8px}
.postcard__excerpt{margin:0;color:color-mix(in oklab,var(--fg),var(--muted) 28%)}
.pill{display:inline-flex;align-items:center;padding:3px 8px;border-radius:999px;border:1px solid var(--hair);background:color-mix(in oklab,var(--bg),transparent 0%);color:var(--fg);opacity:.9;font-size:12px}
.posttags{display:flex;gap:6px;flex-wrap:wrap}
.toc{display:grid;gap:6px}
.toc a{color:var(--fg);opacity:.78;font-size:14px;padding:6px 8px;border-radius:10px;border:1px solid transparent;text-decoration:none}
.toc a:hover{opacity:1;background:var(--card);border-color:var(--hair)}
.toc a[data-depth="3"]{padding-left:18px;font-size:13px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.chip{display:inline-flex;align-items:center;cursor:pointer;border:1px solid var(--hair);background:color-mix(in oklab,var(--card),transparent 10%);color:var(--fg);padding:7px 10px;border-radius:999px;font-size:13px;opacity:.9;text-decoration:none}
.chip:hover{opacity:1;text-decoration:none}
.chip.is-active{border-color:color-mix(in oklab,var(--accent),var(--hair) 35%);box-shadow:0 0 0 3px color-mix(in oklab,var(--accent),transparent 82%);opacity:1}
.pagefoot{margin-top:26px}

/* Compact directory listings (used by content_dir.html) */
.dirlist{
  display:grid;
  gap:4px;
  margin-top:8px;
}
.diritem{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  padding:4px 0;
  border-bottom:1px solid color-mix(in oklab,var(--hair),transparent 35%);
}
.diritem__link{
  color:var(--fg);
  text-decoration:none;
  line-height:1.35;
}
.diritem__link:hover{
  text-decoration:underline;
}
.diritem__kind{
  color:var(--muted);
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:.05em;
  white-space:nowrap;
}

/* Profile rail card */
.profile-card{display:grid;gap:10px}
.profile-card__avatar{
  width:96px;
  height:96px;
  border-radius:999px;
  object-fit:cover;
  object-position:center 35%;
  border:1px solid var(--hair);
}
.profile-card__avatar--caricature{
  object-position:center top;
  transform:scale(0.94);
}
.profile-card__name{
  font-weight:700;
  letter-spacing:-0.01em;
}
.profile-card__headline{
  margin:0;
  color:var(--muted);
  font-size:14px;
  line-height:1.5;
}
.profile-card__meta{
  display:grid;
  gap:6px;
  font-size:13px;
  color:var(--muted);
}
.profile-card__contacts{
  gap:6px;
}
.profile-card__contacts a,
.profile-card__contact-item{
  display:inline-flex;
  align-items:center;
  gap:6px;
  width:100%;
  padding:2px 0;
  border-radius:0;
  border:0;
  color:var(--fg);
  text-decoration:none;
  font-size:13px;
  background:transparent;
}
.profile-card__contacts a:hover{
  text-decoration:underline;
  background:transparent;
}
.profile-card__links a{
  display:inline-flex;
  align-items:center;
  gap:6px;
  width:100%;
  padding:2px 0;
  border-radius:0;
  border:0;
  color:var(--fg);
  text-decoration:none;
  font-size:13px;
  background:transparent;
}
.profile-card__links a:hover{
  text-decoration:underline;
  background:transparent;
}
.profile-card__link-icon{
  width:16px;
  height:16px;
  border-radius:0;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:0;
  background:transparent;
  color:var(--muted);
  font-size:9px;
  line-height:1;
  font-weight:700;
  text-transform:lowercase;
}
.profile-card__link-iconimg{
  width:16px;
  height:16px;
  border-radius:0;
  object-fit:cover;
  border:0;
  background:transparent;
}

/* ===== Menu system ===== */

/* Desktop menubar (dropdown) */
.menubar{display:block}
.menu{list-style:none;margin:0;padding:0;display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:center}
.menu__item{position:relative}
.menu__link{color:var(--fg);opacity:.86;font-size:14px;padding:8px 10px;border-radius:12px;display:inline-flex;align-items:center;gap:8px}
.menu__link:hover{text-decoration:none;opacity:1;background:color-mix(in oklab,var(--card),transparent 35%)}
.menu__link[aria-current="page"]{opacity:1;background:var(--card);border:1px solid var(--hair)}
.menu__item.has-sub > .menu__link::after{content:"▾";font-size:12px;opacity:.75;margin-left:2px}

/* Submenu base */
.submenu{list-style:none;margin:0;padding:8px;position:absolute;top:100%;left:0;min-width:240px;transform:translateY(8px);
  background:var(--bg);border:1px solid var(--hair);border-radius:14px;box-shadow:var(--shadow);
  display:none;z-index:200;
}
.submenu__item{position:relative}
.submenu__link{display:flex;justify-content:space-between;align-items:center;padding:10px 10px;border-radius:12px;color:var(--fg);opacity:.9}
.submenu__link:hover{text-decoration:none;opacity:1;background:color-mix(in oklab,var(--card),transparent 15%)}
.submenu__link[aria-current="page"]{opacity:1;background:var(--card);border:1px solid var(--hair)}
.submenu__item.has-sub > .submenu__link::after{content:"›";opacity:.7}

/* Nested submenus fly out right */
.submenu--nested{top:0;left:100%;transform:translateX(8px)}

/* Open on hover + keyboard focus */
.menu__item.has-sub:hover > .submenu,
.menu__item.has-sub:focus-within > .submenu{display:block}
.submenu__item.has-sub:hover > .submenu,
.submenu__item.has-sub:focus-within > .submenu{display:block}

/* Drawer (tablet/mobile) */
.drawer{position:fixed;inset:0;z-index:250;background:rgba(0,0,0,.38);backdrop-filter:blur(3px)}
.drawer__inner{position:absolute;left:0;top:0;height:100%;width:min(420px,92vw);background:var(--bg);
  border-right:1px solid var(--hair);box-shadow:var(--shadow);display:flex;flex-direction:column;
}
.drawer__head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--hair)}
.drawer__title{font-weight:700;letter-spacing:-0.01em}
.drawer__nav{padding:12px 12px 18px 12px;overflow:auto;display:grid;gap:10px}
.drawer__leaf{display:flex;align-items:center;justify-content:space-between;padding:12px 12px;border:1px solid var(--hair);
  background:color-mix(in oklab,var(--card),transparent 10%);border-radius:14px;color:var(--fg);text-decoration:none;opacity:.95}
.drawer__leaf:hover{text-decoration:none;opacity:1}

/* Accordion groups */
.acc{border:1px solid var(--hair);border-radius:16px;overflow:hidden;background:color-mix(in oklab,var(--card),transparent 10%)}
.acc__top{display:flex;align-items:center;justify-content:space-between;width:100%;border:0;background:transparent;
  padding:12px 12px;color:var(--fg);cursor:pointer;font:inherit}
.acc__top:hover{background:color-mix(in oklab,var(--card),transparent 0%)}
.acc__chev{opacity:.7;transition:transform .15s ease}
.acc[aria-expanded="true"] .acc__chev{transform:rotate(180deg)}
.acc__panel{display:none;padding:0 10px 10px 10px}
.acc[aria-expanded="true"] .acc__panel{display:grid;gap:8px}
.acc__child{display:flex;align-items:center;justify-content:space-between;padding:10px 10px;border:1px solid var(--hair);
  border-radius:14px;background:var(--bg);color:var(--fg);text-decoration:none;opacity:.92}
.acc__child:hover{text-decoration:none;opacity:1}
.acc__child--indent{padding-left:18px}

/* Show/hide based on breakpoints */
@media (max-width:980px){
  .menubar{display:none}
  .iconbtn--menu{display:inline-flex}
}
@media (min-width:981px){
  .drawer{display:none!important}
}

/* Hide older nav blocks */
.nav,.mobileNav{display:none!important}

/* ===== Drawer peep-hole fix =====
   Ensure the overlay fills the viewport and the nav can scroll fully.
*/
.topbar{overflow:visible}
.drawer{height:100vh}
.drawer__inner{max-height:100vh}
.drawer__nav{flex:1; min-height:0; overflow:auto; -webkit-overflow-scrolling:touch}

/* Notebook link styling (mobile drawer) */
.drawer__leaf{
  padding:10px 10px;
  background:var(--bg);
  border-radius:14px;
}

/* ===== Drawer link sizing fix ===== */
.drawer__link{
  display:block;
  padding:10px 12px;
  border-radius:12px;
  color:var(--fg);
  text-decoration:none;
  opacity:.9;
}
.drawer__link:hover{
  text-decoration:none;
  opacity:1;
  background:color-mix(in oklab,var(--card),transparent 20%);
}
.drawer__link:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
}

/* Make leaf tiles less 'giant button' if they appear */
.drawer__leaf{
  padding:10px 12px;
  border-radius:12px;
  background:color-mix(in oklab,var(--card),transparent 18%);
}

/* ===== Mobile drawer leaf normalization =====
   Make top-level leaf links (including Notebook) look like standard nav rows.
*/
.drawer__leaf{
  background:var(--bg);
  border:1px solid var(--hair);
  padding:10px 10px;
  border-radius:14px;
  box-shadow:none;
}

/* ===== Desktop dropdown hover bridge =====
   Prevent submenu from disappearing when moving the pointer from the top item
   to the dropdown by removing layout gaps + adding an invisible hover buffer.
*/
.menu__item.has-sub::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  top:100%;
  height:10px; /* hover buffer */
}
.submenu{ margin-top:0; }

/* ===== Desktop menubar restyle (WYSIWYG-like) =====
   Goal: horizontally spaced text links (not pill buttons), subtle underline/active state,
   dropdown panels with modest rounding, keeping current color scheme.
*/
@media (min-width:981px){
  .menu{gap:22px; justify-content:flex-start}
  .menubar{margin-left:8px}
  .menu__link{
    padding:6px 0;
    border-radius:0;
    background:transparent;
    border:0;
    opacity:.9;
    font-size:14px;
    position:relative;
  }
  .menu__link:hover{
    background:transparent;
    text-decoration:none;
    opacity:1;
  }
  /* underline hover */
  .menu__link::after{
    content:"";
    position:absolute;
    left:0; right:0; bottom:-6px;
    height:2px;
    background:color-mix(in oklab,var(--accent),transparent 35%);
    transform:scaleX(0);
    transform-origin:left;
    transition:transform .15s ease;
    border-radius:2px;
  }
  .menu__item:hover > .menu__link::after,
  .menu__item:focus-within > .menu__link::after{
    transform:scaleX(1);
  }
  .menu__link[aria-current="page"]{
    opacity:1;
    background:transparent;
    border:0;
  }
  .menu__link[aria-current="page"]::after{
    transform:scaleX(1);
    background:var(--accent);
  }

  .menu__item.has-sub > .menu__link::before{
    content:"▾";
    font-size:11px;
    opacity:.75;
    margin-left:0;
    position:absolute;
    right:-14px;
    top:7px;
  }
  /* disable old ::after chevron */
  .menu__item.has-sub > .menu__link::after{
    /* keep underline via ::after above; chevron moved to ::before */
  }

  /* Dropdown panels */
  .submenu{
    border-radius:10px;
    padding:6px;
    min-width:220px;
    box-shadow:0 12px 40px rgba(0,0,0,.14);
  }
  :root[data-theme="dark"] .submenu{
    box-shadow:0 16px 54px rgba(0,0,0,.55);
  }
  .submenu__link{
    padding:9px 10px;
    border-radius:8px;
    font-size:14px;
  }
  .submenu__link:hover{
    background:color-mix(in oklab,var(--card),transparent 0%);
  }
  .submenu__link[aria-current="page"]{
    border:0;
    background:color-mix(in oklab,var(--card),transparent 0%);
  }

  /* Flyout indicator */
  .submenu__item.has-sub > .submenu__link::after{
    content:"›";
    opacity:.6;
  }

  /* Make the menubar feel like a strip: slightly reduce topbar padding */
  .topbar__inner{padding-top:12px;padding-bottom:12px}
}

/* ===== Desktop submenu restyle (WYSIWYG-like) =====
   - Rectangular dropdown panel
   - Full-width rows
   - Subtle separators
   - Clear hover highlight
   - Flyout submenus aligned and crisp
*/
@media (min-width:981px){
  .submenu{
    background:color-mix(in oklab,var(--bg),white 0%);
    border:1px solid color-mix(in oklab,var(--fg),transparent 85%);
    border-radius:6px;
    padding:4px 0;
    box-shadow:0 10px 30px rgba(0,0,0,.12);
    transform:translateY(6px); /* keep a little visual spacing, no hover gap */
  }
  :root[data-theme="dark"] .submenu{
    background:color-mix(in oklab,var(--bg),black 0%);
    border-color:color-mix(in oklab,var(--fg),transparent 82%);
    box-shadow:0 18px 54px rgba(0,0,0,.55);
  }

  .submenu__item + .submenu__item{
    border-top:1px solid color-mix(in oklab,var(--fg),transparent 88%);
  }

  .submenu__link{
    width:100%;
    border-radius:0;
    padding:9px 12px;
    line-height:1.2;
    font-size:14px;
    opacity:.92;
    background:transparent;
  }
  .submenu__link:hover{
    background:color-mix(in oklab,var(--accent),transparent 88%);
    opacity:1;
  }
  .submenu__link[aria-current="page"]{
    background:color-mix(in oklab,var(--accent),transparent 86%);
    opacity:1;
  }

  /* Flyout submenu: align flush to the right edge with a small offset */
  .submenu--nested{
    border-radius:6px;
    padding:4px 0;
    transform:translateX(6px);
  }

  /* Reduce "cardy" feel */
  .submenu__item.has-sub > .submenu__link::after{
    content:"▶"; /* small right-pointing triangle */
    font-size:10px;
    opacity:.65;
  }

  /* Improve hover bridge for nested submenus too */
  .submenu__item.has-sub::after{
    content:"";
    position:absolute;
    top:0;
    right:-10px;
    width:10px;
    height:100%;
  }
}

/* ===== Submenus like main menu (different panel color) =====
   Intent: submenu items look like the top-level text links (underline on hover/active),
   but the dropdown panel has a subtly different background tint.
*/
@media (min-width:981px){
  .submenu{
    background:color-mix(in oklab,var(--bg),var(--card) 55%);
    border:1px solid color-mix(in oklab,var(--fg),transparent 86%);
    border-radius:8px;
    padding:10px 14px;
    box-shadow:0 10px 30px rgba(0,0,0,.12);
  }

  /* remove row separators + row highlighting from previous styles */
  .submenu__item + .submenu__item{border-top:0}

  .submenu__link{
    padding:6px 0;
    border-radius:0;
    background:transparent;
    border:0;
    opacity:.9;
    font-size:14px;
    position:relative;
    justify-content:flex-start;
  }
  .submenu__link:hover{
    background:transparent;
    opacity:1;
  }

  /* underline hover, like main menu */
  .submenu__link::before{
    content:"";
    position:absolute;
    left:0; right:0; bottom:-6px;
    height:2px;
    background:color-mix(in oklab,var(--accent),transparent 40%);
    transform:scaleX(0);
    transform-origin:left;
    transition:transform .15s ease;
    border-radius:2px;
  }
  .submenu__item:hover > .submenu__link::before,
  .submenu__item:focus-within > .submenu__link::before{
    transform:scaleX(1);
  }

  .submenu__link[aria-current="page"]{
    opacity:1;
  }
  .submenu__link[aria-current="page"]::before{
    transform:scaleX(1);
    background:var(--accent);
  }

  /* flyout indicator matches style (subtle) */
  .submenu__item.has-sub > .submenu__link::after{
    content:"▸";
    font-size:11px;
    opacity:.65;
    margin-left:auto;
  }

  /* nested panel should use same treatment */
  .submenu--nested{
    background:color-mix(in oklab,var(--bg),var(--card) 55%);
    border-radius:8px;
    padding:10px 14px;
    transform:translateX(6px);
  }
}

/* ===== Horizontal sub-menus (WYSIWYG-style) =====
   Submenus appear as horizontal bars beneath the main menu,
   using the same link styling as top-level items.
*/
@media (min-width:981px){
  /* First-level submenu becomes horizontal bar */
  .menu__item > .submenu{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    flex-direction:row;
    gap:22px;
    align-items:center;
    justify-content:flex-start;
    padding:10px 16px;
    background:color-mix(in oklab,var(--bg),var(--card) 55%);
    border:1px solid color-mix(in oklab,var(--fg),transparent 86%);
    border-left:0;
    border-right:0;
    border-radius:0;
    box-shadow:0 8px 24px rgba(0,0,0,.12);
  }

  /* Show on hover/focus */
  .menu__item.has-sub:hover > .submenu,
  .menu__item.has-sub:focus-within > .submenu{
    display:flex;
  }

  /* Submenu items inline */
  .submenu__item{
    position:relative;
  }

  .submenu__link{
    padding:6px 0;
    font-size:14px;
    border-radius:0;
    background:transparent;
  }

  /* Underline hover/active (same as main menu) */
  .submenu__link::before{
    content:"";
    position:absolute;
    left:0; right:0; bottom:-6px;
    height:2px;
    background:color-mix(in oklab,var(--accent),transparent 40%);
    transform:scaleX(0);
    transform-origin:left;
    transition:transform .15s ease;
  }
  .submenu__item:hover > .submenu__link::before,
  .submenu__item:focus-within > .submenu__link::before{
    transform:scaleX(1);
  }
  .submenu__link[aria-current="page"]::before{
    transform:scaleX(1);
    background:var(--accent);
  }

  /* Disable vertical flyouts for now */
  .submenu--nested{
    position:static;
    display:contents;
    transform:none;
    background:none;
    border:0;
    box-shadow:none;
    padding:0;
  }
}


/* ===== Full-width slide-under horizontal submenus =====
   Makes the horizontal submenu feel like it slides out from underneath the sticky topbar.
*/
@media (min-width:981px){
  /* Ensure submenu isn't constrained by parent list item */
  .menu__item{ position:static; }

  .menu__item > .submenu{
    position:fixed;
    left:0;
    right:0;
    top:var(--topbar-h, 60px);
    width:100vw;

    display:flex; /* keep flex for animation */
    flex-direction:row;
    gap:24px;
    align-items:center;
    justify-content:center;

    padding:12px 18px;
    background:color-mix(in oklab,var(--bg),var(--card) 60%);
    border-top:1px solid color-mix(in oklab,var(--fg),transparent 86%);
    border-bottom:1px solid color-mix(in oklab,var(--fg),transparent 86%);
    border-left:0;
    border-right:0;
    border-radius:0;
    box-shadow:none;

    opacity:0;
    transform:translateY(-10px);
    pointer-events:none;
    visibility:hidden;
    transition:opacity .14s ease, transform .14s ease, visibility 0s linear .14s;
    z-index:240; /* above content, below drawer */
  }

  .menu__item.has-sub:hover > .submenu,
  .menu__item.has-sub:focus-within > .submenu{
    opacity:1;
    transform:translateY(0);
    pointer-events:auto;
    visibility:visible;
    transition:opacity .14s ease, transform .14s ease;
  }

  /* Links in the bar look like main menu links (underline) */
  .submenu__link{
    padding:6px 0;
    border-radius:0;
    background:transparent;
    font-size:14px;
    position:relative;
  }
  .submenu__link::before{
    content:"";
    position:absolute;
    left:0; right:0; bottom:-6px;
    height:2px;
    background:color-mix(in oklab,var(--accent),transparent 40%);
    transform:scaleX(0);
    transform-origin:left;
    transition:transform .15s ease;
  }
  .submenu__item:hover > .submenu__link::before,
  .submenu__item:focus-within > .submenu__link::before{
    transform:scaleX(1);
  }
  .submenu__link[aria-current="page"]::before{
    transform:scaleX(1);
    background:var(--accent);
  }

  /* Remove flyout cues in this mode */
  .submenu__item.has-sub > .submenu__link::after{ content:""; }
  .submenu--nested{ display:none !important; }
}


/* ===== Full-width submenu glitch fixes =====
   - Make submenu background fully opaque
   - Keep dropdown trigger triangle within link hitbox
   - Add a small hover buffer to prevent flicker while crossing edges
*/
@media (min-width:981px){
  /* Opaque bar */
  .menu__item > .submenu{
    background:var(--bg);
    /* if you prefer slightly different tint but still opaque, swap to: background: var(--card); */
    opacity:0;
    /* reduce travel to minimize hover loss during animation */
    transform:translateY(-6px);
  }
  .menu__item.has-sub:hover > .submenu,
  .menu__item.has-sub:focus-within > .submenu{
    opacity:1;
    transform:translateY(0);
  }

  /* Put the ▾ inside the link bounds (no negative right offset hitbox weirdness) */
  .menu__link{
    padding-right:18px;
  }
  .menu__item.has-sub > .menu__link::before{
    right:0;
    top:7px;
  }

  /* Hover buffer under the menu item to bridge to the bar */
  .menu__item.has-sub::after{
    content:"";
    position:absolute;
    left:0;
    right:0;
    top:100%;
    height:14px;
    background:transparent;
  }

  /* Remove any delayed visibility switching that can cause momentary dismiss */
  .menu__item > .submenu{
    visibility:hidden;
    transition:opacity .12s ease, transform .12s ease, visibility 0s linear .12s;
  }
  .menu__item.has-sub:hover > .submenu,
  .menu__item.has-sub:focus-within > .submenu{
    visibility:visible;
    transition:opacity .12s ease, transform .12s ease;
  }
}


/* ===== Desktop menu final hover/triangle cleanup =====
   Fixes:
   - flicker when moving from top link to full-width bar (remove hover buffer artifact)
   - submenu shouldn't appear when hovering below main menu unless within item or bar
   - remove duplicate triangles by eliminating pseudo-element conflicts
*/
@media (min-width:981px){
  /* 1) Remove any hover-buffer pseudo elements added earlier */
  .menu__item.has-sub::after{ content:none !important; }
  .submenu__item.has-sub::after{ content:none !important; }

  /* 2) Make submenu bar "touch" the topbar edge to avoid a dead gap */
  .menu__item > .submenu{
    top:calc(var(--topbar-h, 60px) - 1px);
    transform:none;                 /* no translate gap */
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transition:opacity .12s ease, visibility 0s linear .12s;
  }
  .menu__item.has-sub:hover > .submenu,
  .menu__item.has-sub:focus-within > .submenu,
  .menu__item > .submenu:hover{
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transition:opacity .12s ease;
  }

  /* 3) Stop using ::after for underline (it conflicted with old chevron rules).
        Use background-image underline instead. */
  .menu__link{
    padding:6px 16px 6px 0;
    background-image:linear-gradient(var(--accent), var(--accent));
    background-repeat:no-repeat;
    background-position:0 100%;
    background-size:0% 2px;
    transition:background-size .15s ease, opacity .15s ease;
  }
  .menu__item:hover > .menu__link,
  .menu__item:focus-within > .menu__link{
    background-size:100% 2px;
    opacity:1;
  }
  .menu__link::after{ content:"" !important; } /* nuke any old pseudo chevrons/underlines */
  .menu__link::before{ content:"" !important; }

  /* Add a single chevron via a span-free approach */
  .menu__item.has-sub > .menu__link{
    position:relative;
    padding-right:22px;
  }
  .menu__item.has-sub > .menu__link::after{
    content:"▾" !important;
    position:absolute;
    right:0;
    top:7px;
    font-size:11px;
    opacity:.75;
  }

  /* Active page underline */
  .menu__link[aria-current="page"]{
    background-size:100% 2px;
    opacity:1;
  }

  /* 4) Submenu link underline matches main menu (different tint panel already handled) */
  .submenu__link{
    background-image:linear-gradient(var(--accent), var(--accent));
    background-repeat:no-repeat;
    background-position:0 100%;
    background-size:0% 2px;
    transition:background-size .15s ease, opacity .15s ease;
  }
  .submenu__item:hover > .submenu__link,
  .submenu__item:focus-within > .submenu__link{
    background-size:100% 2px;
    opacity:1;
  }
  .submenu__link::before{ content:none !important; }
  .submenu__link::after{ content:none !important; }

  /* Keep submenu bar fully opaque */
  .menu__item > .submenu{ background:var(--bg); }
}


/* ===== Inline chevron + stable hover bridge =====
   - Chevron is real markup (part of link), not an overlay pseudo-element.
   - Submenu stays open while crossing from link to the full-width bar.
*/
@media (min-width:981px){
  /* Chevron as inline text */
  .menu__chev{
    display:inline-block;
    margin-left:6px;
    font-size:11px;
    line-height:1;
    opacity:.75;
    transform:translateY(-1px);
    pointer-events:none; /* hover is only about the link */
  }

  /* Remove any pseudo-element chevrons we previously used */
  .menu__item.has-sub > .menu__link::before,
  .menu__item.has-sub > .menu__link::after{
    content:none !important;
  }

  /* Restore menu item positioning for hover bridge pseudo-element */
  .menu__item{ position:relative; }

  /* Conditional hover bridge: ONLY exists while the item is hovered/focused */
  .menu__item.has-sub:hover::after,
  .menu__item.has-sub:focus-within::after{
    content:"";
    position:fixed;
    left:0;
    right:0;
    top:calc(var(--topbar-h, 60px) - 1px);
    height:14px;
    background:transparent;
  }

  /* Ensure submenu is directly adjacent to the bridge */
  .menu__item > .submenu{
    top:calc(var(--topbar-h, 60px) + 13px); /* bridge height - 1px overlap */
  }

  /* Keep open when hovering the bar itself */
  .menu__item > .submenu:hover{
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transition:opacity .12s ease;
  }
}


/* ===== Desktop submenu: JS-controlled open state =====
   We stop relying on :hover (which is brittle with fixed full-width bars) and instead
   open/close submenus via a .is-open class managed by site.js.
*/
@media (min-width:981px){
  /* Ensure default is closed */
  .menu__item > .submenu{
    opacity:0 !important;
    visibility:hidden !important;
    pointer-events:none !important;
  }
  /* Open state */
  .menu__item.is-open > .submenu{
    opacity:1 !important;
    visibility:visible !important;
    pointer-events:auto !important;
  }

  /* Remove any previous hover-driven open rules so they don't fight JS */
  .menu__item.has-sub:hover > .submenu,
  .menu__item.has-sub:focus-within > .submenu,
  .menu__item > .submenu:hover{
    /* no-op; JS controls via .is-open */
  }

  /* Remove hover-bridge hacks (JS makes them unnecessary) */
  .menu__item.has-sub:hover::after,
  .menu__item.has-sub:focus-within::after{
    content:none !important;
  }

  /* Give submenu bar a tiny top overlap to avoid a physical gap */
  .menu__item > .submenu{
    top:calc(var(--topbar-h, 60px) - 1px);
  }
}

/* ===== Desktop menu hover style: background highlight (no underline) ===== */
@media (min-width:981px){
  /* Remove underline effects entirely */
  .menu__link,
  .submenu__link{
    background-image:none !important;
  }

  /* Top-level hover/active */
  .menu__item:hover > .menu__link,
  .menu__item.is-open > .menu__link,
  .menu__item:focus-within > .menu__link{
    background-color:color-mix(in oklab,var(--card),var(--bg) 35%);
    border-radius:4px;
    opacity:1;
  }

  /* Active page */
  .menu__link[aria-current="page"]{
    background-color:color-mix(in oklab,var(--card),var(--bg) 25%);
    opacity:1;
  }

  /* Submenu bar items */
  .submenu__item:hover > .submenu__link,
  .submenu__item:focus-within > .submenu__link{
    background-color:color-mix(in oklab,var(--card),var(--bg) 35%);
    border-radius:4px;
  }

  .submenu__link[aria-current="page"]{
    background-color:color-mix(in oklab,var(--card),var(--bg) 25%);
  }
}

/* ===== Desktop menu: remove any remaining underline + full-height highlight ===== */
@media (min-width:981px){
  /* Some earlier blocks used background-image underline; kill it everywhere */
  .menu__link,
  .submenu__link{
    background-image:none !important;
    background-size:0 0 !important;
    background-repeat:no-repeat !important;
  }

  /* Make the topbar row stretch so highlights can fill the full height */
  .topbar__inner{ align-items:stretch; }
  .menubar{ align-self:stretch; }
  .menu{ align-items:stretch; }

  .menu__item{ display:flex; align-items:stretch; }
  .menu__link{
    display:flex;
    align-items:center;
    height:100%;
    padding:0 12px;          /* no vertical padding so it fills the bar */
    border-radius:0;         /* full-height block looks better square */
  }

  /* Darker full-height highlight */
  .menu__item:hover > .menu__link,
  .menu__item.is-open > .menu__link,
  .menu__item:focus-within > .menu__link{
    background-color:color-mix(in oklab,var(--card),var(--bg) 15%);
    opacity:1;
  }

  .menu__link[aria-current="page"]{
    background-color:color-mix(in oklab,var(--card),var(--bg) 8%);
    opacity:1;
  }
}

/* ===== Desktop menubar/menu match topbar height + dark hover ===== */
:root{
  --menu-hover-bg: #2b2f33; /* dark gray */
  --menu-hover-fg: #ffffff; /* white */
}

@media (min-width:981px){
  /* Make the entire topbar row a consistent height */
  .topbar{ display:flex; }
  .topbar__inner{
    align-items:stretch;
    width:100%;
  }

  .menubar{
    align-self:stretch;
    display:flex;
  }
  .menu{
    height:100%;
    align-items:stretch;
  }
  .menu__item{
    height:100%;
    align-items:stretch;
  }
  .menu__link{
    height:100%;
    display:flex;
    align-items:center;
    color:var(--fg);
  }

  /* Hover/open/focus states: dark bg + white text */
  .menu__item:hover > .menu__link,
  .menu__item.is-open > .menu__link,
  .menu__item:focus-within > .menu__link{
    background:var(--menu-hover-bg);
    color:var(--menu-hover-fg);
    opacity:1;
  }
  .menu__item:hover > .menu__link .menu__chev,
  .menu__item.is-open > .menu__link .menu__chev,
  .menu__item:focus-within > .menu__link .menu__chev{
    opacity:1;
  }

  /* Active page: slightly softer dark bg but still white text */
  .menu__link[aria-current="page"]{
    background:color-mix(in oklab,var(--menu-hover-bg),var(--bg) 18%);
    color:var(--menu-hover-fg);
    opacity:1;
  }
}

/* ===== Desktop: make menu items fill visible topbar (including previous padding) =====
   The old topbar used vertical padding on .topbar__inner, which prevents children from
   ever reaching the full header height. On desktop we move vertical space into a fixed
   min-height and center contents, so .menu__item can truly be 100% height.
*/
@media (min-width:981px){
  :root{ --topbar-min-h: 56px; }

  .topbar{
    min-height:var(--topbar-min-h);
    align-items:stretch;
  }

  /* Remove vertical padding that creates "dead" space above/below the menu */
  .topbar__inner{
    padding-top:0 !important;
    padding-bottom:0 !important;
    min-height:var(--topbar-min-h);
  }

  /* Keep brand/actions vertically centered within the bar */
  .brand,
  .topbar__actions{
    display:flex;
    align-items:center;
    height:100%;
  }

  /* Menubar truly fills the bar */
  .menubar,
  .menu,
  .menu__item,
  .menu__link{
    height:100%;
  }

  /* Give links comfortable horizontal padding; no vertical padding needed */
  .menu__link{
    padding:0 14px !important;
  }
}

/* ===== Desktop menu spacing + underline removal ===== */
@media (min-width:981px){
  /* Remove horizontal gaps between items */
  .menu{
    gap:0 !important;
  }
  .menu__item{
    margin:0 !important;
  }

  /* Ensure no residual underline styles on items without submenus */
  .menu__item:not(.has-sub) > .menu__link{
    background-image:none !important;
    box-shadow:none !important;
    text-decoration:none !important;
  }

  /* Active/hover state for non-dropdown items: background only */
  .menu__item:not(.has-sub):hover > .menu__link,
  .menu__item:not(.has-sub):focus-within > .menu__link,
  .menu__item:not(.has-sub) > .menu__link[aria-current="page"]{
    background:var(--menu-hover-bg);
    color:var(--menu-hover-fg);
  }
}

/* ===== Final desktop menu cleanup ===== */
@media (min-width:981px){
  /* Remove any remaining ::after indicator on current page links */
  .menu__link[aria-current="page"]::after{
    content:none !important;
  }

  /* Remove border-radius on hover/open states */
  .menu__item:hover > .menu__link,
  .menu__item.is-open > .menu__link,
  .menu__item:focus-within > .menu__link{
    border-radius:0 !important;
  }
}

/* ===== Kill ALL ::after underline remnants on desktop menu ===== */
@media (min-width:981px){
  /* Absolutely nuke any pseudo-elements that could render bars */
  .menu__link::after,
  .menu__link::before,
  .menu__item::after,
  .menu__item::before,
  .submenu__link::after,
  .submenu__link::before{
    content:none !important;
    display:none !important;
    background:none !important;
    box-shadow:none !important;
  }
}

/* ===== Desktop submenu themed like main menu ===== */
@media (min-width:981px){
  :root{ --submenu-min-h: 46px; }

  /* Make the whole submenu bar match the active/hovered main menu background */
  .menu__item.is-open > .submenu{
    background:var(--menu-hover-bg) !important;
    color:var(--menu-hover-fg) !important;
  }

  /* Submenu bar height + item fill */
  .menu__item > .submenu{
    min-height:var(--submenu-min-h);
    padding:0 8px !important;        /* no vertical padding so children can fill */
    align-items:stretch !important;
    justify-content:center;
  }

  .submenu__item{
    height:100%;
    display:flex;
    align-items:stretch;
  }

  .submenu__link{
    height:100%;
    display:flex;
    align-items:center;
    padding:0 14px !important;
    color:var(--menu-hover-fg) !important;
    opacity:1;
    border-radius:0 !important;
    background:transparent !important;
  }

  /* Hover/active in submenu: slightly lighter/darker blocks but same theme */
  .submenu__item:hover > .submenu__link,
  .submenu__item:focus-within > .submenu__link{
    background:color-mix(in oklab,var(--menu-hover-bg),white 8%) !important;
  }
  .submenu__link[aria-current="page"]{
    background:color-mix(in oklab,var(--menu-hover-bg),white 12%) !important;
  }
}

/* ===== Desktop submenu final tweaks ===== */
@media (min-width:981px){
  /* Vertically center submenu items */
  .menu__item > .submenu{
    display:flex;
    align-items:center !important;
  }

  .submenu__item{
    display:flex;
    align-items:center;
  }

  .submenu__link{
    display:flex;
    align-items:center;
  }

  /* Highlighted submenu item uses body background */
  .submenu__item:hover > .submenu__link,
  .submenu__item:focus-within > .submenu__link,
  .submenu__link[aria-current="page"]{
    background:var(--bg) !important;
    color:var(--menu-hover-fg) !important;
  }
}

/* ===== Desktop submenu height + contrast fixes ===== */
@media (min-width:981px){
  /* Ensure submenu bar has a definite height */
  :root{
    --submenu-h: 56px; /* match topbar height */
  }

  .menu__item > .submenu{
    height:var(--submenu-h);
    min-height:var(--submenu-h);
    padding:0 !important;
    align-items:stretch !important;
  }

  /* Make each submenu item fill the bar vertically */
  .submenu__item{
    height:100%;
    align-items:stretch;
  }

  .submenu__link{
    height:100%;
    display:flex;
    align-items:center;
    padding:0 14px !important;
  }

  /* Hovered/active submenu item uses body bg AND readable text */
  .submenu__item:hover > .submenu__link,
  .submenu__item:focus-within > .submenu__link,
  .submenu__link[aria-current="page"]{
    background:var(--bg) !important;
    color:var(--fg) !important; /* readable against light bg */
  }
}

/* ===== Desktop submenu: tighter + shorter ===== */
@media (min-width:981px){
  :root{
    --submenu-h: 44px; /* shorter than topbar */
  }

  /* Remove all internal spacing on submenu bar */
  .menu__item > .submenu{
    height:var(--submenu-h);
    min-height:var(--submenu-h);
    padding:0 !important;
    margin:0 !important;
    gap:0 !important;
    align-items:stretch !important;
  }

  /* Remove spacing around submenu items */
  .submenu__item{
    height:100%;
    margin:0 !important;
    padding:0 !important;
    align-items:stretch;
  }

  .submenu__link{
    height:100%;
    margin:0 !important;
    padding:0 12px !important; /* horizontal only */
    line-height:1;
    align-items:center;
  }
}

/* ===== Desktop submenu: remove borders entirely ===== */
@media (min-width:981px){
  .menu__item > .submenu{
    border: 0 !important;
    box-shadow: none !important;
    outline: none !important;
  }
}

/* ===== Mobile/Tablet: square theme for drawer + accordion ===== */
@media (max-width:980px){
  /* Drawer panel + overlay */
  .drawer__inner{
    border-radius:0 !important;
  }
  .drawer__head{
    border-radius:0 !important;
  }

  /* Accordion containers */
  .acc{
    border-radius:0 !important;
  }
  .acc__top{
    border-radius:0 !important;
  }
  .acc__panel{
    border-radius:0 !important;
  }

  /* Links inside drawer (including notebook, leaf, children) */
  .drawer__leaf,
  .acc__child,
  .drawer__link{
    border-radius:0 !important;
  }

  /* Remove any pill-like rounding on icon buttons in the header */
  .iconbtn{
    border-radius:0 !important;
  }

  /* Tighten up "cardy" feel by reducing extra shadows */
  .drawer__inner{
    box-shadow:none !important;
  }
  .drawer__leaf,
  .acc,
  .acc__child{
    box-shadow:none !important;
  }
}

/* ===== Mobile/Tablet: remove vertical spacing between sub-menu items ===== */
@media (max-width:980px){
  /* Accordion child list spacing */
  .acc__panel{
    padding-top:0 !important;
    padding-bottom:0 !important;
  }

  /* Individual sub-menu items */
  .acc__child{
    margin:0 !important;
    padding-top:0 !important;
    padding-bottom:0 !important;
  }

  /* Links inside sub-menu items */
  .acc__child > a,
  .acc__child .drawer__link{
    margin:0 !important;
    padding-top:12px;   /* keep tap target, but no extra gaps */
    padding-bottom:12px;
  }
}

/* ===== Mobile/Tablet: completely zero acc__panel spacing ===== */
@media (max-width:980px){
  .acc__panel{
    padding:0 !important;
    margin:0 !important;
    gap:0 !important;
  }

  .acc__panel > *{
    margin:0 !important;
  }
}