/* Layout: one quiet column that steps aside for the app's own screens; the viewer's carbon greys, keys as headings. */
:root{
  /* app tokens (theme.cpp): greys are R=G=B, the only color is the signature red */
  --canvas:#161616; --chrome:#1f1f1f; --raised:#2a2a2a; --line:#333;
  --text:#ececec; --muted:#9a9a9a; --faint:#8a8a8a; --red:#d9564a;
  --sans:'Pretendard','Segoe UI','Malgun Gothic','Apple SD Gothic Neo',system-ui,sans-serif;
  --w:1180px; --gut:clamp(16px,4vw,40px);
  color-scheme:dark;
}
@font-face{font-family:'Pretendard';font-weight:400;font-display:swap;src:url(fonts/Pretendard-Regular.subset.woff2) format('woff2')}
@font-face{font-family:'Pretendard';font-weight:600;font-display:swap;src:url(fonts/Pretendard-SemiBold.subset.woff2) format('woff2')}
@font-face{font-family:'Pretendard';font-weight:700;font-display:swap;src:url(fonts/Pretendard-Bold.subset.woff2) format('woff2')}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px;background:var(--canvas)}
body{margin:0;background:var(--canvas);color:var(--text);font:400 16px/1.7 var(--sans);-webkit-font-smoothing:antialiased;word-break:keep-all;overflow-wrap:break-word}
a{color:inherit}
:focus-visible{outline:2px solid var(--text);outline-offset:4px;border-radius:2px}
img{display:block;max-width:100%;height:auto}
.wrap{max-width:var(--w);margin:0 auto;padding-inline:var(--gut)}

/* top bar */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:color-mix(in srgb,var(--canvas) 86%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid transparent}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:60px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:700;font-size:17px;letter-spacing:-.02em}
.brand img{width:26px;height:26px}
.top nav{display:flex;align-items:center;gap:clamp(14px,3vw,28px);font-size:14px;color:var(--muted)}
.top nav a{text-decoration:none}
.top nav a:hover{color:var(--text)}
.top nav .dl{color:var(--text)}

/* hero */
.hero{padding-block:clamp(56px,9vw,112px) clamp(40px,6vw,64px)}
.eyebrow{font-size:13px;color:var(--muted);letter-spacing:.02em;margin:0 0 20px;font-variant-numeric:tabular-nums}
h1{font-size:clamp(46px,8.4vw,104px);line-height:1.04;letter-spacing:-.055em;font-weight:700;margin:0;text-wrap:balance}
html[lang=en] h1{letter-spacing:-.045em}
.hero .lead{font-size:clamp(17px,1.8vw,20px);color:var(--muted);max-width:30em;margin:28px 0 36px;line-height:1.65}
.cta{display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px}
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--text);color:var(--canvas);text-decoration:none;font-weight:600;font-size:15px;padding:13px 22px;border-radius:3px}
.btn:hover{background:#fff}
.link{font-size:15px;color:var(--muted);text-decoration:none;border-bottom:1px solid var(--line);padding-bottom:2px}
.link:hover{color:var(--text);border-color:var(--muted)}
.specs{margin:28px 0 0;font-size:13px;color:var(--faint);font-variant-numeric:tabular-nums}

/* screens: the app's own window is the frame, so no borders or cards */
.shot{margin:0}
.shot img{border-radius:6px;box-shadow:0 40px 80px -40px #000,0 0 0 1px #ffffff0f}
.shot figcaption{font-size:13px;color:var(--faint);margin-top:14px}
.hero-shot{max-width:1440px;margin:0 auto;padding-inline:var(--gut)}

/* chapters: each led by the keys that do it */
.chapter{padding-block:clamp(72px,11vw,140px) 0}
.chapter .head{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:24px clamp(32px,6vw,96px);align-items:end;margin-bottom:clamp(28px,4vw,48px)}
.keys{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:18px}
kbd{font:600 12px/1 var(--sans);color:var(--text);background:var(--raised);border:1px solid #3c3c3c;border-bottom-width:2px;border-radius:3px;padding:6px 8px;min-width:28px;text-align:center;white-space:nowrap}
h2{font-size:clamp(30px,4.2vw,52px);line-height:1.18;letter-spacing:-.045em;font-weight:700;margin:0;text-wrap:balance}
h2 .dim{color:var(--faint)}
.chapter p{color:var(--muted);margin:0;max-width:34em}
.chapter p + p{margin-top:12px}
.note{font-size:13px;color:var(--faint)}

/* reference: the one feature others lack, given its own ground */
.ref{margin-top:clamp(96px,13vw,168px);background:var(--chrome);border-block:1px solid var(--line);padding-block:clamp(64px,9vw,120px)}
.ref .tag{display:inline-flex;align-items:center;gap:10px;font-size:13px;color:var(--text);margin-bottom:22px}
.ref .tag::before{content:"";width:18px;height:2px;background:var(--red)}
.ref .head{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:24px clamp(32px,6vw,96px);align-items:end;margin-bottom:clamp(32px,5vw,56px)}
.ref p{color:var(--muted);margin:0;max-width:34em}
.ref .shot img{box-shadow:0 40px 80px -40px #000}
.keylist{list-style:none;margin:clamp(32px,5vw,56px) 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:0 32px;border-top:1px solid var(--line)}
.keylist li{display:flex;align-items:center;gap:14px;padding:14px 0;border-bottom:1px solid var(--line);font-size:15px;color:var(--muted);min-width:0}
.keylist li span:first-child{display:flex;gap:4px;flex:none;width:96px}

/* versions */
.versions{padding-block:clamp(88px,12vw,150px) 0}
.versions .head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:end;gap:16px;margin-bottom:36px}
.versions ol{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.versions li{display:grid;grid-template-columns:120px minmax(0,1fr);gap:24px;padding:18px 0;border-bottom:1px solid var(--line);color:var(--muted)}
.versions li b{color:var(--text);font-weight:600;font-variant-numeric:tabular-nums}
.versions li.next b,.versions li.next{color:var(--faint)}
.versions li.now b::after{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--red);margin-left:10px;vertical-align:middle}

/* download */
.get{padding-block:clamp(88px,12vw,150px) clamp(72px,9vw,110px)}
.get .grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:40px clamp(32px,6vw,96px);margin-top:40px}
.pick{border-top:1px solid var(--line)}
.pick a{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 16px;padding:22px 0;border-bottom:1px solid var(--line);text-decoration:none}
.pick a:hover .name{text-decoration:underline;text-underline-offset:5px}
.pick .name{font-size:19px;font-weight:600;letter-spacing:-.02em}
.pick .desc{grid-column:1;font-size:14px;color:var(--muted)}
.pick .arrow{grid-row:1/3;grid-column:2;align-self:center;color:var(--muted);font-size:20px}
dl{margin:0;display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px 28px;font-size:14px;align-content:start}
dt{color:var(--faint)}
dd{margin:0;color:var(--muted);font-variant-numeric:tabular-nums}

footer{border-top:1px solid var(--line);padding-block:32px 48px;font-size:13px;color:var(--faint)}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px 32px}
footer nav{display:flex;flex-wrap:wrap;gap:8px 22px}
footer a{text-decoration:none}
footer a:hover{color:var(--text)}

@media (max-width:820px){
  .chapter .head,.ref .head,.get .grid{grid-template-columns:minmax(0,1fr);align-items:start}
  .top nav .opt{display:none}
  .versions li{grid-template-columns:72px minmax(0,1fr);gap:16px}
  .shot img{border-radius:4px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}