/* AstroForge — shared design system (index, thanks, legal, tutorial) */


:root{
  --bg:#04060c;
  --bg-2:#070a13;
  --bg-3:#0b0f1b;
  --glass:rgba(148,178,220,.055);
  --glass-2:rgba(148,178,220,.09);
  --line:rgba(170,200,240,.10);
  --line-2:rgba(170,200,240,.18);
  --ink:#eef3fa;
  --ink-2:#b9c4d3;
  --ink-3:#8795a8;
  --cyan:#43d9ff;
  --cyan-ink:#021a22;
  --ha:#ff6f86;
  --oiii:#4de3cf;
  --gold:#f4ca7e;
  --f-display:"Instrument Serif","Iowan Old Style","Palatino Linotype",Georgia,serif;
  --f-sans:"Jakarta",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --f-mono:"JB Mono",ui-monospace,"Cascadia Mono",Consolas,monospace;
  --r:18px;
  --r-sm:12px;
  --wrap:1180px;
  --gutter:clamp(16px,4vw,40px);
  --ease:cubic-bezier(.2,.8,.2,1);
  color-scheme:dark;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink-2);font:400 16px/1.7 var(--f-sans);overflow-x:hidden;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,video,canvas,svg{display:block;max-width:100%}
img{height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
h1,h2,h3,h4{color:var(--ink);margin:0;font-weight:400}
p{margin:0}
ul{margin:0;padding:0}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
::selection{background:rgba(67,217,255,.3);color:#fff}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:fixed;left:16px;top:-60px;z-index:200;background:var(--cyan);color:var(--cyan-ink);padding:10px 16px;border-radius:10px;font-weight:700;transition:top .2s}
.skip:focus{top:12px}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}

/* ── Sky: fixed starfield canvas + nebula glow ── */
.sky{position:fixed;inset:0;z-index:-1;pointer-events:none;overflow:hidden;background:
  radial-gradient(1200px 700px at 78% -10%,rgba(67,217,255,.10),transparent 60%),
  radial-gradient(900px 600px at -10% 30%,rgba(255,111,134,.07),transparent 60%),
  radial-gradient(800px 800px at 60% 110%,rgba(77,227,207,.06),transparent 60%),
  var(--bg)}
.sky canvas{position:absolute;inset:0;width:100%;height:100%}
.sky .neb{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;will-change:transform}
.sky .neb.a{width:46vmax;height:34vmax;left:52%;top:6%;background:radial-gradient(closest-side,rgba(255,111,134,.28),rgba(255,111,134,0));animation:drift-a 38s ease-in-out infinite alternate}
.sky .neb.b{width:40vmax;height:40vmax;left:-12%;top:48%;background:radial-gradient(closest-side,rgba(67,217,255,.18),rgba(67,217,255,0));animation:drift-b 46s ease-in-out infinite alternate}
.sky .neb.c{width:30vmax;height:26vmax;left:64%;top:70%;background:radial-gradient(closest-side,rgba(77,227,207,.14),rgba(77,227,207,0));animation:drift-a 52s ease-in-out infinite alternate-reverse}
@keyframes drift-a{to{transform:translate3d(-6vmax,4vmax,0) scale(1.12)}}
@keyframes drift-b{to{transform:translate3d(7vmax,-5vmax,0) scale(.92)}}
@media (prefers-reduced-motion:reduce){.sky .neb{animation:none}}

/* ── Type ── */
.eyebrow{display:inline-flex;align-items:center;gap:10px;font:500 11.5px/1.2 var(--f-mono);letter-spacing:.18em;text-transform:uppercase;color:var(--ink-3)}
.eyebrow::before{content:"";width:22px;height:1px;background:linear-gradient(90deg,var(--cyan),transparent)}
.display{font-family:var(--f-display);font-weight:400;letter-spacing:-.01em;line-height:1.02}
.display em,.h2 em,.h3 em{font-style:italic;background:linear-gradient(100deg,var(--ha) 0%,#ffb3a6 38%,var(--oiii) 100%);-webkit-background-clip:text;background-clip:text;color:transparent;padding-right:.06em}
.h2{font-family:var(--f-display);font-size:clamp(2.2rem,5.2vw,4rem);line-height:1.04;letter-spacing:-.01em}
.h3{font-family:var(--f-display);font-size:clamp(1.8rem,3.4vw,2.6rem);line-height:1.08}
.lead{font-size:clamp(1rem,1.3vw,1.125rem);color:var(--ink-2);max-width:60ch}
.mono{font-family:var(--f-mono)}
.sec-head{display:grid;gap:18px;margin-bottom:clamp(40px,6vw,72px);max-width:760px}
.sec-head.center{margin-inline:auto;text-align:center;justify-items:center}

section{position:relative;padding:clamp(64px,8vw,112px) 0}

/* ── Buttons ── */
.btn{--h:52px;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:var(--h);padding:0 26px;border-radius:999px;border:1px solid transparent;font:700 14px/1 var(--f-sans);letter-spacing:.02em;cursor:pointer;transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s,border-color .25s,color .25s;white-space:nowrap}
.btn svg{width:18px;height:18px;flex:none}
.btn-primary{background:linear-gradient(180deg,#6fe4ff,#2fc6f0);color:var(--cyan-ink);box-shadow:0 0 0 1px rgba(255,255,255,.25) inset,0 10px 30px -10px rgba(67,217,255,.65)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 0 1px rgba(255,255,255,.35) inset,0 18px 40px -12px rgba(67,217,255,.8)}
.btn-ghost{background:rgba(255,255,255,.03);border-color:var(--line-2);color:var(--ink)}
.btn-ghost:hover{background:rgba(255,255,255,.07);border-color:rgba(170,200,240,.3)}
.btn-block{width:100%}
.btn .sub{display:block;font:500 10.5px/1.2 var(--f-mono);letter-spacing:.14em;opacity:.8;margin-top:5px;text-transform:uppercase}
.btn.stack{flex-direction:column;gap:0;padding:14px 26px;border-radius:18px}
.btn.stack .row{display:inline-flex;align-items:center;gap:10px}

/* ── Glass ── */
.glass{background:linear-gradient(180deg,rgba(160,190,235,.075),rgba(160,190,235,.03));border:1px solid var(--line);border-radius:var(--r);box-shadow:0 1px 0 rgba(255,255,255,.05) inset,0 30px 60px -30px rgba(0,0,0,.6);-webkit-backdrop-filter:blur(14px) saturate(120%);backdrop-filter:blur(14px) saturate(120%)}

/* ── Nav ── */
.nav{position:fixed;inset:0 0 auto 0;z-index:100;transition:background .35s,border-color .35s,backdrop-filter .35s;border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(4,6,12,.72);-webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);border-bottom-color:var(--line)}
.nav-in{display:flex;align-items:center;gap:20px;height:72px}
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--ink);font:700 13px/1 var(--f-sans);letter-spacing:.32em}
.brand img{width:28px;height:28px}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-links a{padding:9px 13px;border-radius:999px;font-size:13.5px;font-weight:500;color:var(--ink-2);transition:color .2s,background .2s}
.nav-links a:hover{color:var(--ink);background:rgba(255,255,255,.05)}
.nav-cta{margin-left:6px}
.nav-cta.btn{--h:40px;padding:0 18px;font-size:13px}
.nav-links a.btn-primary{color:var(--cyan-ink)}
.nav-links a.btn-primary:hover{background:linear-gradient(180deg,#8aeaff,#43d0f5)}
.lang{display:inline-flex;padding:3px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.02)}
.lang button{border:0;background:none;cursor:pointer;min-width:38px;height:32px;border-radius:999px;font:500 11.5px/1 var(--f-mono);letter-spacing:.08em;color:var(--ink-3);transition:color .2s,background .2s}
.lang button:hover{color:var(--ink)}
.lang button[aria-pressed="true"]{background:rgba(67,217,255,.14);color:var(--cyan)}
.burger{display:none;margin-left:auto;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.03);cursor:pointer;align-items:center;justify-content:center}
.burger span{position:relative;display:block;width:18px;height:1.5px;background:var(--ink)}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:1.5px;background:var(--ink);transition:transform .3s var(--ease)}
.burger span::before{top:-6px}.burger span::after{top:6px}
.nav.open .burger span{background:transparent}
.nav.open .burger span::before{transform:translateY(6px) rotate(45deg)}
.nav.open .burger span::after{transform:translateY(-6px) rotate(-45deg)}

@media (max-width:1020px){
  .burger{display:inline-flex}
  .nav-links{position:fixed;inset:72px 0 auto 0;margin:0;flex-direction:column;align-items:stretch;gap:2px;padding:14px var(--gutter) 24px;background:rgba(4,6,12,.96);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-bottom:1px solid var(--line);transform:translateY(-8px);opacity:0;visibility:hidden;transition:opacity .25s,transform .25s var(--ease),visibility .25s}
  .nav.open .nav-links{opacity:1;visibility:visible;transform:none}
  .nav.open{background:rgba(4,6,12,.96)}
  .nav-links a{padding:14px 12px;font-size:16px;border-radius:12px}
  .nav-cta{margin:10px 0 0}
  .nav-cta.btn{--h:50px}
  .nav .lang{order:3}
}

/* ── Reveal ── */
.js .rv{opacity:0;transform:translateY(28px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
.js .rv.in{opacity:1;transform:none}
.js .rv.d1{transition-delay:.08s}.js .rv.d2{transition-delay:.16s}.js .rv.d3{transition-delay:.24s}.js .rv.d4{transition-delay:.32s}
@media (prefers-reduced-motion:reduce){.js .rv{opacity:1;transform:none;transition:none}}

/* ── Before/after comparison ── */
.ba{--pos:50%;position:relative;overflow:hidden;border-radius:var(--r-sm);background:#000;isolation:isolate;touch-action:pan-y;user-select:none;-webkit-user-select:none}
.ba img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;pointer-events:none}
.ba .ba-after{clip-path:inset(0 0 0 var(--pos))}
.ba input[type=range]{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:ew-resize;z-index:4;-webkit-appearance:none;appearance:none;touch-action:pan-y}
.ba .ba-line{position:absolute;top:0;bottom:0;left:var(--pos);width:2px;margin-left:-1px;background:linear-gradient(180deg,transparent,rgba(255,255,255,.95) 12%,rgba(255,255,255,.95) 88%,transparent);z-index:3;pointer-events:none;box-shadow:0 0 18px rgba(67,217,255,.6)}
.ba .ba-knob{position:absolute;top:50%;left:var(--pos);width:46px;height:46px;margin:-23px 0 0 -23px;border-radius:50%;z-index:3;pointer-events:none;display:grid;place-items:center;background:rgba(6,10,20,.55);border:1.5px solid rgba(255,255,255,.9);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);box-shadow:0 0 0 6px rgba(67,217,255,.12),0 8px 24px rgba(0,0,0,.5);transition:box-shadow .2s}
.ba .ba-knob svg{width:22px;height:22px;color:#fff}
.ba:focus-within .ba-knob{box-shadow:0 0 0 3px var(--cyan),0 0 0 9px rgba(67,217,255,.2)}
.ba .ba-tag{position:absolute;top:12px;z-index:2;padding:6px 10px;border-radius:999px;font:500 10.5px/1 var(--f-mono);letter-spacing:.14em;text-transform:uppercase;color:#fff;background:rgba(4,6,12,.62);border:1px solid rgba(255,255,255,.14);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);pointer-events:none;transition:opacity .2s}
.ba .ba-tag.l{left:12px}.ba .ba-tag.r{right:12px}

/* ── Footer ── */
.foot{border-top:1px solid var(--line);padding:56px 0 40px;background:linear-gradient(180deg,transparent,rgba(0,0,0,.5))}
.foot-in{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px}
.foot-links{display:flex;flex-wrap:wrap;gap:6px 22px}
.foot-links a{font-size:14px;color:var(--ink-2)}
.foot-links a:hover{color:var(--ink)}
.foot small{font:400 12px/1.5 var(--f-mono);color:var(--ink-3);letter-spacing:.06em}

/* ── Simple pages (legal, thanks) ── */
.page{min-height:100vh;padding:120px 0 80px}
.page .wrap{max-width:820px}
.doc{padding:clamp(28px,5vw,56px)}
.doc h1{font-family:var(--f-display);font-size:clamp(2.4rem,6vw,3.6rem);line-height:1.05;margin-bottom:8px}
.doc .subtitle{font:500 12px/1.5 var(--f-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);margin-bottom:36px}
.doc h2{font:600 13px/1.4 var(--f-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);margin:34px 0 12px}
.doc p,.doc li{font-size:15.5px;line-height:1.8;color:var(--ink-2)}
.doc p+p{margin-top:10px}
.doc ul{padding-left:20px;margin:10px 0 14px}
.doc li{margin-bottom:6px}
.doc a{color:var(--cyan);text-decoration:underline;text-decoration-color:rgba(67,217,255,.4);text-underline-offset:3px}
.doc strong{color:var(--ink);font-weight:600}
.back{display:inline-flex;align-items:center;gap:8px;margin-bottom:28px;color:var(--ink-2);font-size:14px}
.back:hover{color:var(--cyan)}

/* ── Simple top bar (legal, tutorial) ── */
.ptop{position:fixed;inset:0 0 auto 0;z-index:100;background:rgba(4,6,12,.72);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.ptop .wrap{max-width:var(--wrap);display:flex;align-items:center;gap:16px;height:68px}
.ptop .spacer{flex:1}
.ptop .home-link{font-size:14px;color:var(--ink-2);padding:8px 12px;border-radius:999px}
.ptop .home-link:hover{color:var(--ink);background:rgba(255,255,255,.05)}
@media (max-width:520px){.ptop .brand span{display:none}}