/* Layout: the page reads like the app itself: a navy bar, light paper, and each block joined to the next as nodes of an XSD diagram; the download is an xs:choice */
:root {
  --ink: #121a27;          /* app bar navy */
  --ink-2: #1c2638;
  --teal: #0e6a72;         /* brand teal */
  --teal-soft: #dcefef;
  --on-teal: #ffffff;
  --amber: #f2b705;        /* the EASY tag */
  --orange: #e8590c;       /* xs:choice */
  --paper: #edf1f5;
  --panel: #ffffff;
  --fg: #172130;
  --muted: #5a6778;
  --line: #d3dbe4;
  --on-ink: #e9eef5;
  --on-ink-muted: #9aa8bb;
  --shadow: 0 24px 60px -24px rgba(15, 30, 50, .45);
  --f-display: "IBM Plex Sans Condensed", "Arial Narrow", "Segoe UI", sans-serif;
  --f-body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --f-mono: "IBM Plex Mono", "Cascadia Mono", Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #0b111b; --ink-2: #141c2a; --teal: #5bc6ce; --teal-soft: #12343a; --on-teal: #06191b; --paper: #0f141b; --panel: #161d27;
    --fg: #e6ebf2; --muted: #9ba8b9; --line: #2a3546; --shadow: 0 24px 60px -24px rgba(0, 0, 0, .7); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ink: #0b111b; --ink-2: #141c2a; --teal: #5bc6ce; --teal-soft: #12343a; --on-teal: #06191b; --paper: #0f141b; --panel: #161d27;
  --fg: #e6ebf2; --muted: #9ba8b9; --line: #2a3546; --shadow: 0 24px 60px -24px rgba(0, 0, 0, .7); color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--fg); font: 16px/1.6 var(--f-body); -webkit-font-smoothing: antialiased; }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 60; background: var(--ink); }
a { color: inherit; }
img { max-width: 100%; display: block; }
h1, h2, h3 { text-wrap: balance; margin: 0; }
.wrap { max-width: 1180px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.mono { font-family: var(--f-mono); }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; border-radius: 6px; }

/* ---------- Top bar ---------- */
.top { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 50; background: var(--ink); color: var(--on-ink); border-bottom: 1px solid rgba(255, 255, 255, .06); }
.top .wrap { display: flex; align-items: center; gap: 20px; padding-block: 12px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 700 22px/1 var(--f-body); letter-spacing: -.01em; }
.brand svg { width: 32px; height: 32px; flex: none; }
.brand .tag { font: 700 12px/1 var(--f-mono); letter-spacing: .08em; background: var(--amber); color: #1a1405; padding: 4px 6px 3px; border-radius: 4px; }
.top nav { display: flex; gap: 4px; margin-left: auto; }
.top .lang { margin-left: 4px; }
.top nav a { text-decoration: none; font-size: 14px; font-weight: 500; color: var(--on-ink-muted); padding: 6px 10px; border-radius: 6px; }
.top nav a:hover { color: #fff; background: rgba(255, 255, 255, .06); }
.btn { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; font: 600 15px/1 var(--f-body); padding: 12px 18px; border-radius: 9px; border: 1.5px solid transparent; cursor: pointer; transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease; }
.btn svg { width: 18px; height: 18px; flex: none; }
.btn.primary { background: var(--amber); color: #1a1405; }
.btn.primary:hover { transform: translateY(-1px); box-shadow: 0 8px 20px -8px rgba(242, 183, 5, .7); }
.btn.ghost { border-color: rgba(255, 255, 255, .25); color: var(--on-ink); }
.btn.ghost:hover { border-color: var(--on-ink); }
.top .btn { padding: 9px 14px; font-size: 14px; }
.lang { display: inline-flex; padding: 2px; border: 1px solid rgba(255, 255, 255, .18); border-radius: 8px; gap: 2px; }
.lang a { font: 600 12px/1 var(--f-mono); color: var(--on-ink-muted); text-decoration: none; padding: 7px 9px; border-radius: 6px; }
.lang a:hover { color: #fff; }
.lang a[aria-current="true"] { background: var(--on-ink); color: #121a27; }
.btn .os { font: 600 10.5px/1 var(--f-mono); letter-spacing: .04em; padding: 3px 6px; border-radius: 4px; background: rgba(0, 0, 0, .14); }

/* ---------- Hero ---------- */
.hero { background: var(--ink); color: var(--on-ink); position: relative; overflow: hidden; }
.hero::after { content: ""; position: absolute; inset: auto 0 0; height: 140px; background: var(--paper); }
.hero .wrap { position: relative; z-index: 1; padding-block: 64px 0; display: grid; gap: 40px; }
.hero .copy { display: grid; gap: 22px; max-width: 760px; }
.eyebrow { font: 500 13px/1.4 var(--f-mono); color: var(--on-ink-muted); letter-spacing: .02em; }
.eyebrow b { color: var(--amber); font-weight: 600; }
.hero h1 { font: 700 clamp(44px, 7.4vw, 88px)/0.98 var(--f-display); letter-spacing: -.02em; }
.hero h1 em { font-style: normal; color: var(--amber); }
.hero .lead { font-size: clamp(17px, 2vw, 20px); color: #c9d3e0; max-width: 640px; margin: 0; }
.hero .ctas { display: flex; flex-wrap: wrap; gap: 12px; }
.pipes { display: flex; flex-wrap: wrap; gap: 8px 0; margin: 0; padding: 0; list-style: none; }
@media (min-width: 900px) { .pipes { flex-wrap: nowrap; width: max-content; max-width: calc(100vw - 32px); } }
.pipes li + li::before { content: "|"; margin: 0 11px; color: rgba(154, 168, 187, .5); font-weight: 400; }
.pipes li { display: flex; align-items: center; font: 500 11.5px/1 var(--f-mono); color: var(--on-ink-muted); }
.pipes i { font-style: normal; padding: 3px 6px; border: 1px solid rgba(154, 168, 187, .55); border-radius: 4px; }
.pipes em { width: 14px; border-top: 1px solid rgba(154, 168, 187, .7); position: relative; }
.pipes em::after { content: ""; position: absolute; right: 1px; top: -3px; width: 5px; height: 5px; border-radius: 50%; background: var(--on-ink-muted); }
.pipes span { padding: 0 5px; }
.shot { border-radius: 12px; overflow: hidden; background: var(--panel); box-shadow: var(--shadow); border: 1px solid rgba(255, 255, 255, .08); }
.shot .bar { display: flex; align-items: center; gap: 7px; height: 30px; padding: 0 12px; background: #1d2636; color: #8e9bb0; font: 500 12px/1 var(--f-mono); }
.shot .bar i { width: 11px; height: 11px; border-radius: 50%; background: #3a465a; }
.shot .bar span { margin-left: 8px; }
.shot img { width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: cover; object-position: top left; }
.hero .shot { max-width: 1060px; justify-self: center; width: 100%; }

/* ---------- Sections ---------- */
section.block { padding-block: 88px 0; }
.sec-head { display: grid; gap: 10px; max-width: 720px; margin-bottom: 36px; }
.sec-head .k { font: 600 12.5px/1 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--teal); }
.sec-head h2 { font: 700 clamp(32px, 4.6vw, 52px)/1.02 var(--f-display); letter-spacing: -.015em; }
.sec-head p { margin: 0; color: var(--muted); font-size: 17px; max-width: 62ch; }

/* ---------- Tools explorer: a list of nodes and the screen of the one chosen ---------- */
.tools { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 32px; align-items: start; }
.tlist { display: grid; gap: 8px; margin: 0; padding: 0; list-style: none; position: relative; }
.tlist::before { content: ""; position: absolute; left: 13px; top: 20px; bottom: 20px; border-left: 1.6px solid var(--line); }
.tbtn { position: relative; width: 100%; display: grid; grid-template-columns: 28px 1fr; gap: 0 12px; align-items: center; text-align: left; font: inherit; color: inherit; background: none; border: 0; padding: 8px 0; cursor: pointer; }
.tbtn .dot { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--paper); border: 1.6px solid var(--line); font: 600 12px/1 var(--f-mono); color: var(--muted); position: relative; z-index: 1; transition: all .2s ease; }
.tbtn .card { border: 1.4px solid var(--line); background: var(--panel); border-radius: 9px; padding: 10px 14px 10px 16px; position: relative; transition: border-color .2s ease, transform .2s ease, background-color .2s ease; }
.tbtn .card::before { content: ""; position: absolute; left: 3px; top: 3px; bottom: 3px; width: 4px; border-radius: 2px; background: var(--line); transition: background-color .2s ease; }
.tbtn b { display: block; font-size: 15.5px; font-weight: 600; }
.tbtn small { display: flex; align-items: center; gap: 0; margin-top: 4px; font: 500 10.5px/1 var(--f-mono); color: var(--muted); }
.tbtn small i { font-style: normal; padding: 2px 5px; border: 1px solid var(--line); border-radius: 3px; }
.tbtn small em { width: 12px; border-top: 1px solid var(--line); }
.tbtn small span { padding: 0 4px; }
.tbtn:hover .card { border-color: var(--teal); transform: translateX(2px); }
.tbtn[aria-selected="true"] .card { background: var(--teal); border-color: var(--teal); color: var(--on-teal); }
.tbtn[aria-selected="true"] .card::before { background: var(--amber); }
.tbtn[aria-selected="true"] small { color: var(--on-teal); opacity: .85; }
.tbtn[aria-selected="true"] small i, .tbtn[aria-selected="true"] small em { border-color: currentColor; }
.tbtn[aria-selected="true"] .dot { background: var(--amber); border-color: var(--amber); color: #1a1405; }
.tviews { min-width: 0; }
.tview { display: grid; gap: 20px; min-width: 0; }
.tview[hidden] { display: none; }
.zoomable { cursor: zoom-in; }
.tview .shot { border-color: var(--line); }
.tview .shot img { transition: opacity .25s ease; }
.tdesc { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 8px 32px; }
.tdesc h3 { font: 700 28px/1.1 var(--f-display); grid-column: 1 / -1; }
.tdesc p { margin: 0; color: var(--muted); }
.tdesc ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.tdesc li { position: relative; padding-left: 20px; font-size: 15px; }
.tdesc li::before { content: ""; position: absolute; left: 2px; top: .62em; width: 8px; height: 8px; border-radius: 2px; background: var(--teal); }

/* ---------- Highlights ---------- */
.feats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); overflow: hidden; }
.feat { padding: 26px 26px 28px; display: grid; gap: 8px; align-content: start; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feat:nth-child(3n) { border-right: 0; }
.feat:nth-last-child(-n+3) { border-bottom: 0; }
.feat .n { font: 600 12px/1 var(--f-mono); color: var(--teal); }
.feat h3 { font: 600 19px/1.25 var(--f-body); }
.feat p { margin: 0; color: var(--muted); font-size: 15px; }

/* ---------- Gallery ---------- */
.gal { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.gal button { font: inherit; color: inherit; text-align: left; border: 0; background: none; padding: 0; cursor: zoom-in; display: grid; gap: 10px; }
.gal .shot { border-color: var(--line); transition: transform .2s ease; }
.gal button:hover .shot { transform: translateY(-3px); }
.gal b { font-size: 15px; font-weight: 600; }
.gal span { display: block; color: var(--muted); font-size: 13.5px; margin-top: 2px; }
.lb { position: fixed; inset: 0; z-index: 80; background: rgba(8, 12, 20, .86); display: grid; place-items: center; padding: max(24px, env(safe-area-inset-top, 0px)) max(16px, env(safe-area-inset-right, 0px)) max(24px, env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px)); }
.lb[hidden] { display: none; }
.lb figure { margin: 0; max-width: min(1400px, 100%); display: grid; gap: 10px; }
.lb img { max-height: calc(100vh - 120px); width: auto; margin: 0 auto; border-radius: 10px; box-shadow: var(--shadow); }
.lb figcaption { color: #dfe6ef; text-align: center; font-size: 14px; }
.lb .x { position: absolute; top: max(14px, env(safe-area-inset-top, 0px)); right: max(16px, env(safe-area-inset-right, 0px)); font: 600 14px/1 var(--f-body); color: #fff; background: rgba(255, 255, 255, .12); border: 0; padding: 10px 14px; border-radius: 8px; cursor: pointer; }

/* ---------- Viewer ---------- */
.viewer { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 48px; align-items: center; background: var(--ink); color: var(--on-ink); border-radius: 20px; padding: 48px; border: 1px solid var(--line); }
.viewer .sec-head { margin: 0; }
.viewer .sec-head .k { color: var(--amber); }
.viewer .sec-head p { color: #b7c3d3; }
.viewer ul { margin: 18px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.viewer li { display: grid; grid-template-columns: 22px 1fr; gap: 8px; font-size: 15px; color: #d9e1ec; }
.viewer li::before { content: ""; width: 10px; height: 10px; margin: 8px 0 0 4px; border: 1.6px solid var(--amber); border-radius: 50%; }

/* ---------- Download: an xs:choice per app ---------- */
.dl { display: grid; gap: 20px; }
.prod { display: grid; grid-template-columns: 300px auto minmax(0, 1fr); align-items: center; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 26px; gap: 0; }
.prod .who { display: grid; gap: 6px; padding-right: 20px; }
.prod .who .name { margin: 0; display: flex; align-items: center; gap: 10px; font: 700 26px/1.1 var(--f-display); }
.prod .who .name svg { width: 34px; height: 34px; flex: none; }
.prod .who p { margin: 0; color: var(--muted); font-size: 14.5px; }
.prod .who .ver { font: 500 12px/1 var(--f-mono); color: var(--muted); }
.choice { display: flex; align-items: center; }
.choice::before { content: ""; width: 26px; border-top: 1.6px solid var(--teal); }
.choice span { display: inline-flex; align-items: center; gap: 6px; font: 600 11.5px/1 var(--f-body); color: #c2410c; background: #fff3bf; border: 1.4px solid var(--orange); border-radius: 12px; padding: 5px 10px; white-space: nowrap; }
.choice span svg { width: 16px; height: 12px; }
.choice::after { content: ""; width: 26px; border-top: 1.6px solid var(--orange); }
.opts { display: grid; gap: 12px; position: relative; padding-left: 0; }
.opts::before { content: ""; position: absolute; left: 0; top: 50px; bottom: 50px; border-left: 1.6px solid var(--orange); }
.opt { position: relative; margin-left: 22px; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 16px; align-items: center; border: 1.4px solid var(--line); border-radius: 12px; padding: 14px 16px 14px 18px; transition: border-color .2s ease, background-color .2s ease; }
.opt::before { content: ""; position: absolute; left: -23px; top: 50%; width: 22px; border-top: 1.6px solid var(--orange); }
.opt:hover, .opt:focus-within { border-color: var(--teal); background: var(--teal-soft); }
.opt h3 { font: 600 17px/1.2 var(--f-body); }
.opt p { margin: 0; color: var(--muted); font-size: 14px; grid-column: 1; }
.opt .file { grid-column: 1; font: 500 12px/1.3 var(--f-mono); color: var(--muted); overflow-wrap: anywhere; }
.opt .btn { grid-column: 2; grid-row: 1 / span 3; background: var(--teal); color: var(--on-teal); }
.opt .btn:hover { transform: translateY(-1px); box-shadow: 0 8px 18px -8px rgba(14, 106, 114, .8); }
.req { display: flex; flex-wrap: wrap; gap: 8px 22px; color: var(--muted); font-size: 14px; margin-top: 4px; }
.req b { color: var(--fg); font-weight: 600; }

/* ---------- Contribute ---------- */
.kofi { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px 48px; align-items: center; border: 1.5px dashed var(--teal); border-radius: 20px; padding: 40px 48px; background: var(--panel); }
.kofi .sec-head { margin: 0; }
.kofi-cta { display: grid; gap: 10px; justify-items: center; }
.kofi-url { font-size: 13px; color: var(--muted); }
@media (max-width: 760px) { .kofi { grid-template-columns: minmax(0, 1fr); padding: 28px 22px; } .kofi-cta { justify-items: start; } }

/* ---------- Footer ---------- */
footer { margin-top: 96px; background: var(--ink); color: var(--on-ink-muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: center; padding-block: 28px calc(28px + env(safe-area-inset-bottom, 0px)); }
footer .brand { font-size: 18px; color: var(--on-ink); }
footer .brand svg { width: 26px; height: 26px; }
footer a { color: var(--on-ink); }
footer .sp { margin-left: auto; }

@media (max-width: 920px) {
  .tools { grid-template-columns: minmax(0, 1fr); }
  .tlist { display: flex; overflow-x: auto; gap: 8px; padding-bottom: 6px; scrollbar-width: thin; }
  .tlist::before { display: none; }
  .tlist li { flex: none; }
  .tbtn { grid-template-columns: 1fr; padding: 0; }
  .tbtn .dot { display: none; }
  .tbtn:hover .card { transform: none; }
  .tdesc { grid-template-columns: minmax(0, 1fr); }
  .feats { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .feat:nth-child(3n) { border-right: 1px solid var(--line); }
  .feat:nth-child(2n) { border-right: 0; }
  .feat:nth-last-child(-n+3) { border-bottom: 1px solid var(--line); }
  .feat:nth-last-child(-n+2) { border-bottom: 0; }
  .gal { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .viewer { grid-template-columns: minmax(0, 1fr); padding: 28px; gap: 28px; }
  .prod { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .prod .who { padding: 0; }
  .choice::after { display: none; }
  .choice::before { width: 14px; }
}
@media (max-width: 600px) {
  .top nav { display: none; }
  .top .lang { margin-left: auto; }
  .hero .wrap { padding-block: 40px 0; }
  .feats { grid-template-columns: minmax(0, 1fr); }
  .feat { border-right: 0 !important; border-bottom: 1px solid var(--line) !important; }
  .feat:last-child { border-bottom: 0 !important; }
  .gal { grid-template-columns: minmax(0, 1fr); }
  .opt { grid-template-columns: minmax(0, 1fr); }
  .opt .btn { grid-column: 1; grid-row: auto; justify-self: start; margin-top: 6px; }
  footer .sp { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

[hidden] { display: none !important; }
/* ---------- FAQ ---------- */
.faq { display: grid; gap: 10px; max-width: 860px; }
.faq details { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
.faq summary { cursor: pointer; list-style: none; padding: 16px 20px; display: flex; align-items: center; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; margin-left: auto; font: 500 20px/1 var(--f-mono); color: var(--teal); }
.faq details[open] summary::after { content: "\2212"; }
.faq summary h3 { margin: 0; font: 600 17px/1.35 var(--f-body); }
.faq details p { margin: 0; padding: 0 20px 18px; color: var(--muted); max-width: 70ch; }
/* ---------- Footer links ---------- */
footer nav.legal { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-left: auto; }
footer nav.legal a { color: var(--on-ink-muted); text-decoration: none; }
footer nav.legal a:hover { color: #fff; text-decoration: underline; }
@media (max-width: 600px) { footer nav.legal { margin-left: 0; } }
/* ---------- Legal pages ---------- */
main.doc .wrap { padding-block: 56px 24px; }
.legal-doc { max-width: 760px; }
.legal-doc h1 { font: 700 clamp(32px, 4.6vw, 46px)/1.05 var(--f-display); margin-bottom: 6px; }
.legal-doc h2 { font: 600 20px/1.3 var(--f-body); margin: 30px 0 8px; }
.legal-doc h3 { font: 600 15px/1.3 var(--f-body); margin: 18px 0 4px; }
.legal-doc p, .legal-doc li { color: var(--fg); font-size: 15.5px; }
.legal-doc p { margin: 0 0 10px; }
.legal-doc ul { padding-left: 20px; margin: 0 0 10px; display: grid; gap: 6px; }
.legal-doc a { color: var(--teal); }
.legal-doc .upd { color: var(--muted); font: 500 13px/1.4 var(--f-mono); margin-bottom: 24px; }
.legal-doc .note { padding: 10px 14px; border-radius: 10px; background: var(--teal-soft); }
.legal-doc .toc { font-weight: 600; }
.eula { margin-top: 36px; padding-top: 8px; border-top: 1px solid var(--line); }
.eula h2 { font-size: 18px; }
.eula-b p { font-size: 14.5px; }
.nf .k404 { font-size: 15px; color: var(--teal); margin: 0 0 6px; }
@media (max-width: 899px) { .pipes { gap: 8px 14px; } .pipes li + li::before { display: none; } }