/*****************************************************************
 * site.css — shared styles for Covered Call Index content pages
 * (About, Learn, Methodology, Privacy, Contact, Disclaimer)
 * Matches the directory tool: Archivo + IBM Plex Mono, evergreen
 * + brass palette, light/dark themes.
 *****************************************************************/

:root{
  --paper:#F1F4F0; --surface:#FBFCFA; --surface-2:#F6F8F4;
  --ink:#0E1A14; --ink-soft:#33453B; --sage:#5C6E63; --sage-dim:#617168;
  --line:#D8E0D6; --line-strong:#C3CEC0;
  --evergreen:#1C4733; --evergreen-tint:#E7F0EA; --evergreen-soft:#A4C6B3;
  --brass:#8A6710; --brass-soft:#D8B459; --brass-tint:#F3ECD7;
  --hover:#D5DFD3;
  --up:#0F7A4F; --up-tint:#E4F1E9; --down:#B23A2E; --down-tint:#F5E5E2;
  --shadow:0 1px 2px rgba(14,26,20,.05), 0 8px 24px -16px rgba(14,26,20,.18);
  --radius:14px; --radius-sm:9px; --maxw:1320px; --readw:720px;
}
:root[data-theme="dark"]{
  --paper:#0D1611; --surface:#15211B; --surface-2:#1A2820;
  --ink:#E9EFE8; --ink-soft:#B9C6BD; --sage:#92A29A; --sage-dim:#7C8E84;
  --line:#283A30; --line-strong:#33493D;
  --evergreen:#7FC7A2; --evergreen-tint:#1A2C22; --evergreen-soft:#3C6450;
  --brass:#D8B459; --brass-soft:#E7CE8C; --brass-tint:#23301E;
  --hover:#24382C;
  --up:#46C088; --up-tint:#16301F; --down:#E2796C; --down-tint:#321B18;
  --shadow:0 1px 2px rgba(0,0,0,.3), 0 12px 30px -18px rgba(0,0,0,.6);
}

*{box-sizing:border-box}
html{overflow-x:hidden;overflow-x:clip}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:'Archivo',system-ui,sans-serif; font-size:18px; line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
.num{font-family:'IBM Plex Mono',ui-monospace,monospace;font-variant-numeric:tabular-nums}
a{color:var(--brass);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration:underline}
/* nav & chrome links never underline on hover (match index.html) */
.brand:hover,.topnav__link:hover,.nav-dd__btn:hover,.nav-dd__menu a:hover,
.footer-nav a:hover,.btn:hover,.az a:hover{text-decoration:none}
button{font-family:inherit;cursor:pointer}
img{max-width:100%}

/* ============================ TOPBAR ============================ */
.topbar{position:sticky;top:0;z-index:60;
  background:color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.topbar__in{max-width:var(--maxw);margin:0 auto;padding:14px 22px;
  display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;flex-shrink:0;color:var(--ink)}
.brand__mark{width:34px;height:34px;border-radius:8px;flex-shrink:0;background:var(--evergreen);
  display:grid;place-items:center;position:relative;overflow:hidden}
.brand__mark svg{width:20px;height:20px}
.brand__txt{display:flex;flex-direction:column;line-height:1.05}
.brand__name{font-weight:800;letter-spacing:.14em;text-transform:uppercase;font-size:14px}
.brand__sub{font-size:9.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--sage)}
.topnav{display:flex;gap:4px;align-items:center;flex-wrap:wrap}
.topnav__link{
  font-size:13px;font-weight:600;color:var(--sage);text-decoration:none;padding:9px 14px 7px;
  border-radius:999px;min-height:38px;display:inline-flex;align-items:center;
  border:1.5px solid transparent;transition:color .16s, background .16s, border-color .16s;
}
.topnav__link:hover{color:var(--ink);background:var(--hover);text-decoration:none}
.topnav__link[aria-current="page"]{
  color:var(--evergreen);background:var(--evergreen-tint);border-color:var(--evergreen-soft);
}
.topbar__spacer{flex:1}
.icon-btn{
  width:38px;height:38px;border-radius:999px;border:1px solid var(--line);background:var(--surface);
  display:grid;place-items:center;color:var(--ink);flex-shrink:0;transition:all .18s;
}
.icon-btn:hover{border-color:var(--line-strong);background:var(--hover)}
.icon-btn svg{width:17px;height:17px}

/* ============================ PAGE ============================ */
.page{max-width:var(--maxw);margin:0 auto;padding:46px 22px 30px}
.page--wide{max-width:880px}

.eyebrow{font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:600;
  letter-spacing:.16em;text-transform:uppercase;color:var(--brass);margin:0 0 10px}
h1{font-size:34px;line-height:1.15;font-weight:800;letter-spacing:-.015em;margin:0 0 14px}
h2{font-size:24px;line-height:1.25;font-weight:700;letter-spacing:-.01em;margin:40px 0 12px;
  padding-top:8px;scroll-margin-top:80px}
h3{font-size:20px;font-weight:700;margin:26px 0 8px;scroll-margin-top:80px}
.lead{font-size:20.5px;line-height:1.6;color:var(--ink-soft);margin:0 0 22px}
p{margin:0 0 16px}
ul,ol{margin:0 0 18px;padding-left:22px}
li{margin:0 0 8px}
li::marker{color:var(--brass)}
strong,b{font-weight:700;color:var(--ink)}
hr{border:0;border-top:1px solid var(--line);margin:34px 0}
small,.meta{font-size:14px;color:var(--sage)}
.updated{font-family:'IBM Plex Mono',monospace;font-size:13.5px;color:var(--sage);margin:0 0 26px}

a.inline{font-weight:600}
code{font-family:'IBM Plex Mono',monospace;font-size:.88em;background:var(--surface-2);
  border:1px solid var(--line);border-radius:5px;padding:1px 5px}

blockquote{margin:0 0 18px;padding:4px 0 4px 18px;border-left:3px solid var(--evergreen-soft);
  color:var(--ink-soft);font-style:italic}

/* boxed note / callout */
.callout{background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--brass-soft);
  border-radius:var(--radius-sm);padding:16px 18px;margin:0 0 22px}
.callout p:last-child{margin-bottom:0}
.callout--green{border-left-color:var(--evergreen)}
.callout--warn{border-left-color:var(--down)}
.callout__title{font-weight:700;margin:0 0 6px;font-size:16px}

/* definition / glossary list */
.def{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin:0 0 22px;background:var(--surface)}
.def__row{padding:14px 18px;border-bottom:1px solid var(--line)}
.def__row:last-child{border-bottom:0}
.def__term{font-family:'IBM Plex Mono',monospace;font-weight:600;font-size:15px;color:var(--brass);margin:0 0 4px}
.def__row p{margin:0;font-size:16px;color:var(--ink-soft);line-height:1.55}

/* simple table */
.tbl{width:100%;border-collapse:collapse;margin:0 0 22px;font-size:16px}
.tbl th,.tbl td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--sage);font-weight:700}
.tbl td:first-child{font-family:'IBM Plex Mono',monospace;font-weight:600;color:var(--ink);white-space:nowrap}

/* back-to-tool button */
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--evergreen);color:#fff;
  text-decoration:none;font-weight:700;font-size:15px;padding:12px 18px 10px;border-radius:999px;margin-top:6px}
:root[data-theme="dark"] .btn{color:#0D1611}
.btn svg{width:16px;height:16px}
.btn:hover{text-decoration:none;filter:brightness(1.06)}

.toc{background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px 20px;margin:0 0 28px}
.toc__h{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--sage);margin:0 0 8px}
.toc ul{margin:0;padding-left:18px}
.toc li{margin:0 0 5px}

/* ============================ FOOTER ============================ */
.footer{border-top:1px solid var(--line);background:var(--surface);margin-top:40px}
.footer__in{max-width:var(--maxw);margin:0 auto;padding:30px 22px 44px}
.footer-nav{display:flex;flex-wrap:wrap;gap:6px 4px;margin:0 0 18px}
.footer-nav a{font-size:13px;font-weight:600;color:var(--sage);text-decoration:none;padding:6px 10px 4px;border-radius:7px}
.footer-nav a:hover{color:var(--ink);background:var(--hover)}
.footer__disc{font-size:13.5px;line-height:1.6;color:var(--sage);margin:0 0 14px}
.foot-meta{display:flex;align-items:center;gap:8px;color:var(--sage-dim);font-size:11px;flex-wrap:wrap}

/* ============================ RESPONSIVE ============================ */
@media (max-width:1060px){
  .topbar__in .search{flex:0 1 220px}
}
@media (max-width:900px){
  .topbar__in{flex-wrap:wrap;row-gap:8px}
  .topbar__in .search{order:5;flex:1 1 100%;max-width:none}
  .topnav{order:10;width:100%;justify-content:flex-start}
}
@media (max-width:680px){
  body{font-size:16.5px}
  .topbar__in{padding:12px 16px;gap:12px;flex-wrap:wrap}
  .topnav{order:3;width:100%;gap:2px}
  .topnav__link{padding:6px 9px;font-size:13px}
  .page{padding:32px 18px 24px}
  h1{font-size:27px}
  h2{font-size:21px;margin-top:32px}
  .lead{font-size:18.5px}
}

/* ============================ NAV DROPDOWN ============================ */
.nav-dd{position:relative}
.nav-dd__btn{display:inline-flex;align-items:center;gap:4px;font-family:inherit;font-size:13px;font-weight:600;color:var(--sage);background:transparent;border:1.5px solid transparent;padding:9px 12px 7px 14px;border-radius:999px;min-height:38px;cursor:pointer;transition:color .16s, background .16s}
.nav-dd__btn:hover{color:var(--ink);background:var(--hover)}
.nav-dd__cv{width:15px;height:15px;transition:transform .18s;flex-shrink:0}
.nav-dd:hover .nav-dd__cv,.nav-dd[data-open="true"] .nav-dd__cv{transform:rotate(180deg)}
.nav-dd:has(a[aria-current="page"]) .nav-dd__btn{color:var(--evergreen);background:var(--evergreen-tint);border-color:var(--evergreen-soft)}
.nav-dd__menu{position:absolute;top:calc(100% + 6px);left:0;min-width:236px;background:var(--surface);
  border:1px solid var(--line);border-radius:11px;box-shadow:var(--shadow);padding:6px;z-index:80;
  opacity:0;visibility:hidden;transform:translateY(-4px);
  transition:opacity .14s ease, transform .14s ease, visibility 0s linear .32s}
/* invisible bridge covering the gap between button and menu so hover never breaks */
.nav-dd__menu::before{content:"";position:absolute;left:-12px;right:-12px;top:-14px;height:14px}
.nav-dd:hover .nav-dd__menu,.nav-dd:focus-within .nav-dd__menu,.nav-dd[data-open="true"] .nav-dd__menu{
  opacity:1;visibility:visible;transform:none;
  transition:opacity .14s ease, transform .14s ease, visibility 0s}
.nav-dd__menu a{display:block;padding:9px 12px;border-radius:7px;font-size:13px;font-weight:600;
  color:var(--ink-soft);text-decoration:none;white-space:nowrap}
.nav-dd__menu a:hover{background:var(--hover);color:var(--ink);text-decoration:none}
.nav-dd__menu a[aria-current="page"]{color:var(--evergreen);background:var(--evergreen-tint)}
.nav-dd__lbl{font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--sage-dim);padding:8px 12px 4px}
.nav-dd__sep{height:1px;background:var(--line);margin:6px 6px}
@media (max-width:360px){
  .brand__name{font-size:12px;letter-spacing:.09em}
  .brand__sub{font-size:8.5px;letter-spacing:.16em}
}
@media (max-width:680px){
  .nav-dd__menu{left:auto;right:0;min-width:220px}
  .topbar__spacer{display:none}
  #themeBtn{margin-left:auto}
}

/* ============================ GLOSSARY ============================ */
.az{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 32px;padding:14px;background:var(--surface-2);
  border:1px solid var(--line);border-radius:var(--radius-sm)}
.az a{display:grid;place-items:center;width:30px;height:30px;padding-top:2px;border-radius:7px;
  font-family:'IBM Plex Mono',monospace;font-weight:600;font-size:13px;color:var(--brass);
  text-decoration:none;background:var(--surface);border:1px solid var(--line)}
.az a:hover{background:var(--evergreen);color:#fff;border-color:var(--evergreen)}
:root[data-theme="dark"] .az a:hover{color:#0D1611}
.gloss h2{border-top:1px solid var(--line);padding-top:24px;margin-top:34px;color:var(--brass);
  font-family:'IBM Plex Mono',monospace;font-size:15px;font-weight:600;letter-spacing:.16em}
.gloss h3{margin:22px 0 6px;font-size:20px;scroll-margin-top:80px}
.gloss h3:first-of-type{margin-top:8px}
.gterm-abbr{font-family:'IBM Plex Mono',monospace;font-weight:600;color:var(--sage);font-size:.72em;margin-left:6px}
.gloss p{margin:0 0 14px}
.gloss .see{font-size:14.5px;color:var(--sage)}
.gloss .see a{font-weight:600}
.toplink{display:inline-block;font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--sage);text-decoration:none;margin:2px 0 0}
.toplink:hover{color:var(--brass)}

/* ============================ HEADER SEARCH ============================ */
.search{position:relative;flex:0 1 320px;max-width:320px}
.search input{
  width:100%;border:1px solid var(--line);background:var(--surface);color:var(--ink);
  border-radius:999px;padding:10px 14px 8px 36px;font-size:13.5px;font-family:inherit;
  transition:border-color .18s, box-shadow .18s;
}
.search input:focus{outline:none;border-color:var(--brass);box-shadow:0 0 0 3px var(--brass-tint)}
.search svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);width:15px;height:15px;color:var(--sage)}
@media (max-width:680px){
  .search{order:4;width:100%;max-width:none;flex:1 1 100%}
}

/* ============================ FOCUS VISIBLE (WCAG 2.4.7) ============================ */
.topnav__link:focus-visible,.nav-dd__btn:focus-visible,.nav-dd__menu a:focus-visible,
.icon-btn:focus-visible,.footer-nav a:focus-visible,
.btn:focus-visible,.az a:focus-visible,.toplink:focus-visible,.toc a:focus-visible,
main a:focus-visible{outline:2px solid var(--evergreen);outline-offset:2px;border-radius:4px}

/* ============================ BACK TO TOP ============================ */
.to-top{position:fixed;right:22px;bottom:22px;z-index:70;width:44px;height:44px;border-radius:999px;
  border:1px solid var(--line);background:var(--surface);color:var(--ink);display:grid;place-items:center;
  cursor:pointer;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .18s ease, transform .18s ease, visibility 0s linear .18s, background .18s, border-color .18s}
.to-top.is-visible{opacity:1;visibility:visible;transform:none;
  transition:opacity .18s ease, transform .18s ease, visibility 0s, background .18s, border-color .18s}
.to-top:hover{background:var(--hover);border-color:var(--line-strong)}
.to-top:focus-visible{outline:2px solid var(--evergreen);outline-offset:2px}
.to-top svg{width:18px;height:18px}
@media (max-width:680px){.to-top{right:14px;bottom:14px}}

/* smooth in-page scrolling (anchors + back-to-top), disabled for reduced-motion users */
@media (prefers-reduced-motion: no-preference){
  html{scroll-behavior:smooth}
}

/* ============================ SEARCH SUGGESTIONS ============================ */
.search-dd{position:absolute;top:calc(100% + 6px);left:0;right:0;background:var(--surface);
  border:1px solid var(--line);border-radius:11px;box-shadow:var(--shadow);padding:6px;z-index:130;
  max-height:min(430px,62vh);overflow:auto}
.search-dd__lbl{font-family:'IBM Plex Mono',monospace;font-size:10px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--sage-dim);padding:8px 12px 4px}
.search-dd__item{display:block;width:100%;text-align:left;border:0;background:transparent;cursor:pointer;
  padding:8px 12px 7px;border-radius:7px;font-family:inherit}
.search-dd__item:hover,.search-dd__item.is-active{background:var(--hover)}
.search-dd__item:focus-visible{outline:2px solid var(--evergreen);outline-offset:-2px}
.search-dd__title{display:block;font-size:13.5px;font-weight:700;color:var(--ink);line-height:1.35}
.search-dd__sub{display:block;font-size:12px;color:var(--sage);line-height:1.45;margin-top:1px}
.search-dd__title b,.search-dd__sub b{color:var(--evergreen);font-weight:700}
.search-dd__none{padding:12px;font-size:13px;color:var(--sage)}