/* FlipInk — visual system v3: brand aligned to the iOS app (SpaceInkLab / MyScreen).
   Tokens come from InkDesign.swift and the native screenshots, not invented:
   accent #D91F24 (Color 0.85/0.12/0.14), white canvas, black label, secondary #8A8A8E,
   hairline separators, grouped #F2F2F7, case paper #F5F2EB, icon cream #FDFBF4 / yellow #F6BB2E.
   Type: system font (SF Pro / PingFang), heavy 900 headlines with tight tracking, short red rule.
   Radii: 22 primary buttons, 14 cards and groups, 12/8 thumbnails, capsule for header controls. */
:root{
  --ink:#000; --label:#1c1c1e; --grey:#8a8a8e; --grey-2:#6c6c70;
  --canvas:#fff; --group:#f2f2f7; --paper:#f5f2eb; --cream:#fdfbf4;
  --accent:#d91f24; --accent-press:#b8191e; --yellow:#f6bb2e; --sun:#e64f3d; --bezel:#262524;
  --line:rgba(60,60,67,.16); --line-strong:rgba(60,60,67,.29);
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Text","SF Pro Display","PingFang SC","Helvetica Neue","Segoe UI",Roboto,Arial,sans-serif;
  --max:1180px; --r-btn:22px; --r-card:14px; --r-thumb:12px; --r-sm:8px;
  --shadow:0 1px 2px rgba(0,0,0,.04),0 8px 24px rgba(0,0,0,.06);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;background:var(--canvas)}
body{margin:0;background:var(--canvas);color:var(--label);font:17px/1.55 var(--sans);overflow-x:hidden;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--ink);text-decoration-thickness:1px;text-underline-offset:3px;text-decoration-color:var(--line-strong)}
a:hover{color:var(--accent);text-decoration-color:currentColor}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
h1,h2{line-height:1.08;color:var(--ink)}
h1{font-size:clamp(2.3rem,5.2vw,4rem);font-weight:900;letter-spacing:-.035em;margin:.2em 0 .5em}
h1::after{content:"";display:block;width:26px;height:3px;border-radius:2px;background:var(--accent);margin-top:.5em}
h2{font-size:clamp(1.25rem,2vw,1.5rem);font-weight:700;letter-spacing:-.015em;margin:1.6em 0 .5em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 28px}

/* header: app brandHeader (icon + bold wordmark) + capsule controls with hairline */
.top{background:rgba(255,255,255,.88);-webkit-backdrop-filter:saturate(180%) blur(16px);backdrop-filter:saturate(180%) blur(16px);position:sticky;top:0;z-index:5;border-bottom:.5px solid var(--line-strong)}
.bar{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{font-weight:700;font-size:1.25rem;letter-spacing:-.01em;color:var(--ink);text-decoration:none;display:inline-flex;align-items:center;gap:10px;margin:0}
.brand.small{font-size:1.05rem;gap:9px}
.mark{width:36px;height:36px;border-radius:22.5%;flex:none;box-shadow:0 0 0 .5px var(--line)}
.brand.small .mark{width:28px;height:28px}
nav{display:flex;align-items:center;gap:0;border:.7px solid var(--line-strong);border-radius:999px;padding:3px}
nav a{text-decoration:none;font-size:.9rem;font-weight:600;color:var(--label);padding:8px 14px;border-radius:999px;line-height:1}
nav a:hover{color:var(--accent)}
nav a[aria-current="page"]{background:var(--group);color:var(--accent)}

/* shared bits */
.eyebrow{font-size:.95rem;font-weight:600;color:var(--grey);margin:0}
.lead{font-size:1.15rem;color:var(--grey-2);max-width:38em}
.note{color:var(--grey);font-size:.84rem;line-height:1.5}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin:30px 0 10px}
.btn{text-align:center;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:54px;padding:0 28px;background:var(--accent);color:#fff;text-decoration:none;font-weight:600;font-size:1.02rem;border-radius:var(--r-btn);border:0;transition:background .15s,opacity .15s}
.btn:hover{background:var(--accent-press);color:#fff}
.btn:active{opacity:.78}
.btn.ghost{background:var(--canvas);color:var(--ink);box-shadow:inset 0 0 0 .7px var(--line-strong)}
.btn.ghost:hover{background:var(--group);color:var(--ink)}

/* hero: app InkHomeHero — headline left, real app screen right */
.hero{background:var(--canvas)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;padding-top:64px;padding-bottom:72px}
.hero-copy h1{max-width:13ch}
.nw{white-space:nowrap}
.hero-art{position:relative;display:flex;justify-content:center;align-items:center;padding:12px 0 12px}
.device{width:min(330px,78%);background:var(--bezel);padding:10px;border-radius:44px;box-shadow:0 30px 60px -20px rgba(0,0,0,.35),0 0 0 1px rgba(0,0,0,.08)}
.device img{border-radius:34px;background:#fff}

/* features: grouped cards, hairline, 14pt */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding-top:56px;padding-bottom:72px}
.feat{background:var(--canvas);border:.7px solid var(--line-strong);border-radius:var(--r-card);padding:24px 24px 22px}
.feat h2{margin:.7em 0 .3em;font-size:1.2rem}
.feat p{margin:0;color:var(--grey-2);font-size:.98rem}
.chip{display:block;width:36px;height:36px;border-radius:10px}
.chip.k{background:var(--bezel)}
.chip.r{background:var(--sun);border-radius:50%}
.chip.y{background:var(--yellow)}

/* how it works: grouped background like the app's lists */
.band{background:var(--group)}
.how{padding-top:56px;padding-bottom:64px}
.how h2{margin-top:0;font-size:clamp(1.6rem,3vw,2.2rem);font-weight:900;letter-spacing:-.03em}
.how .steps{counter-reset:s;list-style:none;padding:0;margin:24px 0 0;display:grid;grid-template-columns:repeat(3,1fr);background:var(--canvas);border-radius:var(--r-card);overflow:hidden}
.how .steps li{counter-increment:s;padding:24px 24px 26px;border-right:.5px solid var(--line-strong);font-size:1rem;color:var(--grey-2)}
.how .steps li:last-child{border-right:0}
.how .steps li strong{color:var(--ink)}
.how .steps li::before{content:counter(s);display:flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;font-size:.95rem;margin-bottom:14px}

/* sample strip: case paper cards */
.strip{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding-top:64px}
.strip img{background:var(--paper);padding:10px;border-radius:var(--r-card);border:.7px solid var(--line);image-rendering:pixelated}
.closing{padding-top:56px;padding-bottom:72px}
.closing-card{margin:0;padding:20px 24px;background:var(--group);border-radius:var(--r-card);font-weight:500;color:var(--label);max-width:46em}

/* shop */
.page-head{background:var(--canvas);padding:56px 0 24px}
.page-head .lead,.page-head .note{max-width:40em}
.packs{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding-top:24px;padding-bottom:24px}
.pack{background:var(--canvas);border:.7px solid var(--line-strong);border-radius:var(--r-card);overflow:hidden;display:flex;flex-direction:column}
.pack-body{padding:20px 20px 22px;display:flex;flex-direction:column;flex:1;border-top:.5px solid var(--line-strong)}
.pack-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.pack-head h2{margin:0;font-size:1.3rem}
.price{font-weight:600;font-size:1rem;color:var(--accent);margin:0;white-space:nowrap}
.desc{color:var(--grey-2);font-size:.97rem;margin:.7em 0 0}
.thumbs{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;align-items:end;padding:16px;background:var(--paper)}
.thumbs img{border-radius:6px;background:#fff;box-shadow:0 0 0 .5px var(--line);image-rendering:pixelated}
.spec{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:16px 0 20px}
.spec li{background:var(--group);border-radius:999px;padding:4px 10px;font-size:.78rem;font-weight:500;color:var(--grey-2)}
.buy{margin:auto 0 0}
.buy .btn{width:100%;padding:0 16px}
.pack.set{grid-column:1/-1;flex-direction:row}
.pack.set .pack-body{border-top:0;border-left:.5px solid var(--line-strong);padding:30px}
.pack.set h2{font-size:clamp(1.5rem,2.6vw,2rem);font-weight:900;letter-spacing:-.03em}
.pack.set .btn{width:auto}
.pack.set .buy{margin-top:8px}
.set-art{display:flex;gap:12px;padding:28px;align-items:center;justify-content:center;flex:0 0 46%;background:var(--paper)}
.set-art img{width:30%;border-radius:var(--r-sm);background:#fff;box-shadow:0 10px 24px -10px rgba(0,0,0,.35);image-rendering:pixelated}
.set-art img:nth-child(2){transform:translateY(-12px)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:20px;padding-top:40px}
.two>div{border:.7px solid var(--line-strong);border-radius:var(--r-card);background:var(--canvas);padding:4px 24px 18px}
.two li{margin:.35em 0}
.faq{padding-top:24px;padding-bottom:56px}
.faq details,.faq h2{max-width:860px}
.faq details{border-bottom:.5px solid var(--line-strong);margin:0;padding:0}
.faq h2+details{border-top:.5px solid var(--line-strong)}
.faq summary{font-weight:600;cursor:pointer;padding:16px 4px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";flex:none;width:8px;height:8px;border-right:1.6px solid var(--grey);border-bottom:1.6px solid var(--grey);transform:rotate(-45deg);transition:transform .15s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin:0;padding:0 4px 16px;color:var(--grey-2)}

/* prose pages */
.prose{max-width:780px;padding-top:56px;padding-bottom:72px}
.legal h2{font-size:1.15rem;margin-top:1.8em}
.big{font-size:clamp(1.3rem,4vw,1.8rem);font-weight:700;word-break:break-word}
.big a{text-decoration:none;color:var(--accent)}
.callout{background:var(--group);border-radius:var(--r-card);padding:4px 22px;margin:32px 0}

/* footer: grouped light background, hairline */
.foot{background:var(--group);color:var(--grey-2);font-size:.92rem;padding:0 0 24px;border-top:.5px solid var(--line-strong)}
.foot a{color:var(--label)}
.foot a:hover{color:var(--accent)}
.foot .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1.3fr;gap:28px;padding-top:44px}
.foot p{margin:.35em 0}
.label{font-size:.78rem;font-weight:600;color:var(--grey)}
.fine{color:var(--grey);font-size:.8rem;padding-top:24px;margin-top:28px;border-top:.5px solid var(--line-strong)}

@media (max-width:960px){
  .packs{grid-template-columns:1fr 1fr}
  .pack.set{flex-direction:column}
  .pack.set .pack-body{border-left:0;border-top:.5px solid var(--line-strong)}
}
@media (max-width:860px){
  .hero-grid,.two{grid-template-columns:1fr}
  .hero-grid{padding-top:36px;padding-bottom:48px;gap:36px}
  .hero-art{padding:28px 0 24px;background:var(--group);border-radius:var(--r-card)}
  .device{width:min(290px,74%);border-radius:40px}
  .device img{border-radius:30px}
  .features{grid-template-columns:1fr;padding-top:24px;padding-bottom:48px;gap:14px}
  .how .steps{grid-template-columns:1fr}
  .how .steps li{border-right:0;border-bottom:.5px solid var(--line-strong)}
  .how .steps li:last-child{border-bottom:0}
  .strip{grid-template-columns:repeat(2,1fr);gap:14px;padding-top:48px}
  .closing{padding-top:48px;padding-bottom:56px}
  .foot .cols{grid-template-columns:1fr 1fr}
  .page-head{padding:40px 0 16px}
}
@media (max-width:620px){
  .packs{grid-template-columns:1fr;padding-top:16px}
  .set-art{padding:22px}
}
@media (max-width:440px){
  .wrap{padding-left:16px;padding-right:16px}
  .bar{height:58px;gap:8px}
  .brand{font-size:1.08rem;gap:8px}
  .mark{width:30px;height:30px}
  nav{padding:2px}
  nav a{font-size:.76rem;padding:7px 8px}
  .actions .btn{flex:1 1 100%}
  .two>div{padding:2px 18px 14px}
  .foot .cols{grid-template-columns:1fr}
}
@media (max-width:380px){
  nav a{font-size:.72rem;padding:7px 6px}
}
@media (prefers-reduced-motion:reduce){.btn,.faq summary::after{transition:none}}
.pack:not(.set) .pack-head{flex-direction:column;align-items:flex-start;gap:6px}