/* ============================================================
   Open Spark — landing (v2: current UI, video-forward, side-slide)
   Follows design-system/MASTER.md: black · one amber accent ·
   Inter · hairline borders · soft radii · calm motion.
   ============================================================ */
:root {
  --bg:#0E0E10; --surface:#161618; --surface-2:#1C1C1F;
  --text:#F2F2F0; --text-muted:#A1A1AA; --text-faint:#6B6B70;
  --border:#26262A; --border-soft:#1E1E22;
  --accent:#F59E0B; --accent-soft:rgba(245,158,11,.12);
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --maxw:1120px; --r:10px; --r-lg:16px; --ease:cubic-bezier(.4,0,.2,1);
  --slide:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden;}
a{color:inherit;text-decoration:none;}
h1,h2,h3{font-weight:600;letter-spacing:-.02em;line-height:1.06;margin:0;}
p{margin:0;} img,video{display:block;max-width:100%;}
::selection{background:var(--accent-soft);}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px;}
code{font-family:var(--mono);font-size:.9em;color:var(--accent);}

.shell{width:min(var(--maxw),calc(100% - 40px));margin:0 auto;}
.atmos{position:fixed;inset:0;pointer-events:none;z-index:0;background:radial-gradient(720px 360px at 50% -8%,rgba(245,158,11,.07),transparent 70%);}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 18px;border-radius:var(--r);border:1px solid var(--border);background:transparent;color:var(--text);font-family:var(--sans);font-size:14px;font-weight:500;cursor:pointer;transition:background .18s var(--ease),border-color .18s var(--ease);}
.btn:hover{border-color:#3A3A40;background:var(--surface);}
.btn--primary{background:var(--text);color:#111;border-color:transparent;font-weight:600;}
.btn--primary:hover{background:#fff;border-color:transparent;}
.btn svg{width:16px;height:16px;}

/* nav */
.nav{position:sticky;top:0;z-index:40;border-bottom:1px solid transparent;transition:background .3s var(--ease),border-color .3s var(--ease);}
.nav.is-scrolled{background:rgba(14,14,16,.72);backdrop-filter:blur(16px) saturate(1.4);border-bottom-color:var(--border-soft);}
.nav__in{height:64px;display:flex;align-items:center;gap:28px;}
.brand{display:inline-flex;align-items:center;gap:9px;font-weight:600;letter-spacing:-.01em;}
.brand__mark{color:var(--accent);display:inline-flex;}
.brand__mark svg{width:20px;height:20px;}
.nav__links{display:flex;gap:26px;margin-left:8px;margin-right:auto;}
.nav__links a{color:var(--text-muted);font-size:14px;transition:color .18s var(--ease);}
.nav__links a:hover{color:var(--text);}

/* hero */
.hero{position:relative;z-index:1;padding:92px 0 56px;text-align:center;}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--text-muted);margin-bottom:26px;padding:6px 12px;border:1px solid var(--border);border-radius:999px;background:var(--surface);}
.eyebrow b{color:var(--text);font-weight:500;}
.eyebrow .spark{color:var(--accent);display:inline-flex;} .eyebrow .spark svg{width:13px;height:13px;}
.hero h1{font-size:clamp(40px,6.4vw,76px);letter-spacing:-.035em;max-width:16ch;margin:0 auto;}
.hero__sub{margin:24px auto 0;max-width:60ch;font-size:clamp(16px,1.7vw,19px);color:var(--text-muted);line-height:1.55;}
.hero__actions{display:flex;gap:12px;justify-content:center;margin-top:34px;flex-wrap:wrap;}
.hero__note{margin-top:18px;font-size:13px;color:var(--text-faint);}

/* mac window (holds img or video) */
.shot{border:1px solid var(--border);border-radius:14px;overflow:hidden;background:var(--surface);box-shadow:0 40px 120px -40px rgba(0,0,0,.9);position:relative;}
.shot__bar{height:40px;display:flex;align-items:center;gap:8px;padding:0 16px;border-bottom:1px solid var(--border);background:var(--surface-2);}
.shot__bar .d{width:11px;height:11px;border-radius:50%;background:#36363b;}
.shot__bar .label{margin-left:12px;font-size:12px;color:var(--text-faint);font-family:var(--mono);}
.shot img,.shot__video{width:100%;height:auto;display:block;}
.shot__video{aspect-ratio:1440/900;object-fit:cover;object-position:center top;background:#0b0b0d;}
.hero__shot{margin:56px auto 0;max-width:1000px;}

/* section scaffolding */
.section{position:relative;z-index:1;padding:96px 0;}
.s-head{max-width:640px;margin:0 auto 44px;text-align:center;}
.kicker{font-size:13px;font-weight:500;color:var(--accent);letter-spacing:.01em;}
.s-head h2{font-size:clamp(28px,3.8vw,44px);letter-spacing:-.03em;margin:12px 0 14px;}
.s-head p{color:var(--text-muted);font-size:17px;}

/* full tour video */
.tour{max-width:980px;margin:0 auto;}
.tour__play{position:absolute;left:50%;top:calc(50% + 20px);transform:translate(-50%,-50%);width:76px;height:76px;border-radius:50%;border:1px solid var(--border);background:rgba(14,14,16,.66);backdrop-filter:blur(10px);color:#fff;cursor:pointer;display:grid;place-items:center;transition:transform .18s var(--ease),border-color .18s var(--ease),opacity .3s var(--ease);}
.tour__play svg{width:26px;height:26px;margin-left:3px;}
.tour__play:hover{border-color:var(--accent);transform:translate(-50%,-50%) scale(1.06);}
.tour__play.is-hidden{opacity:0;pointer-events:none;}

/* feature rows — media slides in from a side */
.rows{display:flex;flex-direction:column;gap:110px;}
.row{display:grid;grid-template-columns:1fr 1.15fr;gap:56px;align-items:center;}
.row:nth-child(even) .row__media{order:-1;}
.row__ico{width:40px;height:40px;border-radius:var(--r);display:grid;place-items:center;background:var(--accent-soft);color:var(--accent);margin-bottom:18px;}
.row__ico svg{width:21px;height:21px;}
.row__copy h3{font-size:clamp(24px,3vw,32px);letter-spacing:-.025em;margin-bottom:14px;}
.row__copy p{color:var(--text-muted);font-size:16px;}
.row__media .shot{box-shadow:0 30px 90px -45px rgba(0,0,0,.9);}

/* CTA */
.cta{text-align:center;}
.cta__box{max-width:720px;margin:0 auto;border:1px solid var(--border);border-radius:22px;padding:56px 32px;background:var(--surface);}
.cta__mark{color:var(--accent);display:inline-flex;margin-bottom:18px;} .cta__mark svg{width:40px;height:40px;}
.cta__box h2{font-size:clamp(28px,4vw,40px);letter-spacing:-.03em;}
.cta__box>p{color:var(--text-muted);font-size:16.5px;max-width:48ch;margin:14px auto 0;}
.install{display:flex;align-items:center;justify-content:center;gap:30px;margin:34px auto 30px;max-width:420px;}
.install__app,.install__dest{display:flex;flex-direction:column;align-items:center;gap:10px;}
.install__tile{width:92px;height:92px;border-radius:20px;display:grid;place-items:center;border:1px solid var(--border);background:var(--surface-2);}
.install__tile--app{background:#0c0c0d;} .install__tile--app svg{width:48px;height:48px;color:var(--accent);}
.install__tile--dest svg{width:40px;height:40px;color:var(--text-faint);}
.install span{font-size:12.5px;color:var(--text-muted);}
.install__arrow{color:var(--text-faint);} .install__arrow svg{width:26px;height:26px;}
.cta__actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;}
.cta__note{margin-top:18px;font-size:12.5px;color:var(--text-faint);max-width:44ch;margin-inline:auto;}

/* footer */
.footer{position:relative;z-index:1;border-top:1px solid var(--border-soft);padding:34px 0 50px;}
.footer__in{display:flex;align-items:center;gap:18px;flex-wrap:wrap;}
.footer__links{display:flex;gap:22px;margin-left:auto;}
.footer__links a{color:var(--text-muted);font-size:13.5px;transition:color .18s var(--ease);}
.footer__links a:hover{color:var(--text);}
.footer__legal{width:100%;color:var(--text-faint);font-size:12.5px;}

/* ---------- scroll reveals ---------- */
.reveal-up{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease);}
.reveal-right{opacity:0;transform:translateX(72px);transition:opacity .85s var(--slide),transform .85s var(--slide);}
.reveal-left{opacity:0;transform:translateX(-72px);transition:opacity .85s var(--slide),transform .85s var(--slide);}
.is-in{opacity:1 !important;transform:none !important;}

/* ---------- responsive ---------- */
@media (max-width:880px){
  .nav__links{display:none;}
  .row{grid-template-columns:1fr;gap:26px;}
  .row:nth-child(even) .row__media{order:0;}
  .rows{gap:72px;}
  .section{padding:72px 0;}
  /* on mobile, slide up instead of sideways (avoids horizontal jitter) */
  .reveal-right,.reveal-left{transform:translateY(26px);}
}
@media (max-width:520px){ .hero{padding-top:64px;} .install{gap:18px;} }

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto!important;}
  .reveal-up,.reveal-right,.reveal-left{opacity:1;transform:none;}
}