/* =================================================================
   Planeside — Identity System v4  ·  "Electric editorial"
   Premium private-aviation brand. Cool stone base, deep navy-black
   panels, an electric cobalt as the single brand colour, oversized
   geometric display type, frosted glass on dark, monospace flight
   data. Sharp, confident, editorial — not a generic SaaS landing.

   Type trio
     · Space Grotesk — geometric display, headlines, oversized index
     · Inter         — interface, body, buttons
     · IBM Plex Mono — flight data: route codes, tails, times, labels

   Brandable: the demo brand (name / accent / app navy) is driven by
   the CSS custom properties prefixed --b-* (and the brand block inside
   the mockups), so a prospect build is a one-place swap.
   ================================================================= */

:root{
  /* --- cool paper & stone (never pure white, never warm) --- */
  --paper:#EDF0F7;        /* page base, cool off-white */
  --paper-2:#E4E9F3;      /* alternating light section */
  --stone:#DBE2F0;        /* raised sand panel */
  --stone-2:#CCD6EA;      /* deepest cool neutral */
  --card:#FFFFFF;         /* card surface on light */

  /* --- ink --- */
  --ink:#0A1124;          /* deep navy-black — headlines */
  --graphite:#262F45;     /* body copy */
  --graphite-2:#475068;   /* secondary copy */
  --muted:#646E84;        /* muted on light */

  /* --- navy (dark aviation panels) --- */
  --navy:#0A1228;
  --navy-2:#060B1B;       /* footer / deepest */
  --navy-soft:#111B3A;    /* raised card on navy */
  --paper-on-navy:#EAEEF8;
  --muted-on-navy:#94A1BE;
  --line-on-navy:rgba(234,238,248,.14);
  --line-on-navy-soft:rgba(234,238,248,.08);

  /* --- metal / rules --- */
  --silver:#B7C0D4;
  --runway:#7C879E;       /* cool concrete gray — labels & ticks */
  --line:rgba(10,17,36,.13);
  --line-soft:rgba(10,17,36,.07);

  /* --- the single brand colour: electric cobalt --- */
  --accent:#2A4BF0;       /* vivid premium cobalt */
  --accent-deep:#1C34BC;
  --accent-soft:rgba(42,75,240,.09);
  --accent-on-navy:#6E8BFF;   /* brighter cobalt for dark panels */

  /* brand hooks (overridden per prospect demo) */
  --b-accent:var(--accent);
  --b-accent-on-navy:var(--accent-on-navy);

  /* signature gradients */
  --grad-hero:radial-gradient(120% 130% at 78% 8%, #2A4BF0 0%, #1530A0 34%, #0B1530 64%, #070C1E 100%);
  --grad-cta:linear-gradient(118deg, #0B1530 0%, #14276F 52%, #2A4BF0 122%);

  --maxw:1240px;
  --r:16px;               /* card radius */
  --r-sm:10px;            /* button / field radius */
  --display:"Space Grotesk","Inter","Helvetica Neue",Arial,sans-serif;
  --sans:"Inter","Helvetica Neue",Arial,sans-serif;
  --mono:"IBM Plex Mono","SFMono-Regular",ui-monospace,Menlo,monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);
  background:var(--paper);
  color:var(--graphite);
  line-height:1.6;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:var(--b-accent);color:#fff}

/* ---------------- type ---------------- */
h1,h2,h3,h4{font-family:var(--display);color:var(--ink);font-weight:600;line-height:1.02;letter-spacing:-.028em}
h1{font-size:clamp(45px,7.4vw,98px);font-weight:600;letter-spacing:-.04em;line-height:.96}
h2{font-size:clamp(31px,4.4vw,60px);font-weight:600;letter-spacing:-.032em}
h3{font-size:clamp(20px,2.1vw,27px);font-weight:600;letter-spacing:-.018em}
h4{font-size:20px;font-weight:600;letter-spacing:-.01em}
p{color:var(--graphite)}
.lead{font-size:clamp(18px,1.5vw,21px);line-height:1.55;color:var(--graphite-2);max-width:60ch;font-weight:400}

/* accent words — cobalt, not italic */
em,.accent{font-style:normal;color:var(--b-accent);font-weight:500}
.panel-navy .accent,.on-navy .accent{color:var(--b-accent-on-navy)}
h1 em,h2 em,.pull em{font-weight:inherit}
.serif-italic{font-family:var(--display);font-style:normal;font-weight:500;letter-spacing:-.02em;color:var(--ink)}

/* --- mono eyebrow / flight-data label --- */
.eyebrow{
  display:inline-flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:11.5px;font-weight:500;
  letter-spacing:.24em;text-transform:uppercase;color:var(--b-accent);
  margin-bottom:26px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--b-accent);display:inline-block}
.on-navy .eyebrow,.panel-navy .eyebrow{color:var(--b-accent-on-navy)}
.on-navy .eyebrow::before,.panel-navy .eyebrow::before{background:var(--b-accent-on-navy)}

/* mono inline data — route codes, tails, times */
.data{font-family:var(--mono);letter-spacing:.04em;font-feature-settings:"tnum" 1}

/* ---------------- layout ---------------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 34px}
section{position:relative}
.sec{padding:128px 0}
.sec-sm{padding:74px 0}
.panel-paper{background:var(--paper)}
.panel-stone{background:var(--paper-2)}
.panel-sand{background:var(--stone)}
.panel-navy{background:var(--navy);color:var(--paper-on-navy)}
.panel-navy h1,.panel-navy h2,.panel-navy h3,.panel-navy h4{color:var(--paper-on-navy)}
.panel-navy p{color:var(--muted-on-navy)}
.panel-navy .lead{color:#C3CCDE}
.on-navy{color:var(--paper-on-navy)}

/* electric gradient surfaces */
.panel-grad{background:var(--grad-hero);color:var(--paper-on-navy);position:relative}
.panel-grad h1,.panel-grad h2,.panel-grad h3,.panel-grad h4{color:#fff}
.panel-grad p{color:#C7D0E6}
.panel-grad .lead{color:#D2DAEC}
.panel-cta{background:var(--grad-cta);color:#fff}
.panel-cta h2{color:#fff}
.panel-cta .lead{color:#D2DAEC}

/* hairline rule + faint runway grid */
.rule{height:1px;background:var(--line);border:0}
.gridlines::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.6;
  background-image:linear-gradient(var(--line-soft) 1px,transparent 1px),linear-gradient(90deg,var(--line-soft) 1px,transparent 1px);
  background-size:100% 74px,74px 100%;
  -webkit-mask-image:radial-gradient(125% 80% at 50% 0,#000,transparent 72%);
  mask-image:radial-gradient(125% 80% at 50% 0,#000,transparent 72%);
}
.panel-navy.gridlines::before,.panel-grad.gridlines::before{
  background-image:linear-gradient(var(--line-on-navy-soft) 1px,transparent 1px),linear-gradient(90deg,var(--line-on-navy-soft) 1px,transparent 1px);
  opacity:1;
}

/* ---------------- nav ---------------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:17px 34px;
  background:rgba(237,240,247,.82);backdrop-filter:saturate(150%) blur(14px);
  border-bottom:1px solid var(--line-soft);
  transition:background .3s ease,border-color .3s ease;
}
.nav.nav-dark{background:rgba(8,13,29,.55);border-bottom:1px solid var(--line-on-navy-soft)}
.nav.nav-dark .wordmark{color:var(--paper-on-navy)}
.nav.nav-dark .wordmark .c{color:var(--muted-on-navy)}
.nav.nav-dark .brand{color:var(--paper-on-navy)}
.nav.nav-dark .nav-links{color:var(--paper-on-navy)}
.nav.nav-dark .nav-links a.txt:hover{color:#fff}
.nav-links{display:flex;align-items:center;gap:32px;font-size:14px;font-weight:500;color:var(--graphite)}
.nav-links a{position:relative;letter-spacing:.005em}
.nav-links a.txt:hover{color:var(--ink)}
.nav-links a.txt::after{content:"";position:absolute;left:0;bottom:-5px;width:0;height:1.5px;background:var(--b-accent);transition:width .3s}
.nav-links a.txt:hover::after{width:100%}

/* ---------------- logo / wordmark ---------------- */
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--ink)}
.brand .mark{width:30px;height:30px;flex:0 0 auto;color:var(--b-accent)}
.on-navy.brand,.panel-navy .brand,.panel-grad .brand{color:var(--paper-on-navy)}
.on-navy .mark,.panel-navy .brand .mark,.panel-grad .brand .mark{color:var(--b-accent-on-navy)}
.wordmark{
  font-family:var(--display);font-weight:600;font-size:18px;line-height:1;
  letter-spacing:.02em;color:var(--ink);white-space:nowrap;
}
.wordmark .c{font-weight:400;color:var(--graphite-2)}
.on-navy .wordmark,.panel-navy .wordmark,.panel-grad .wordmark{color:var(--paper-on-navy)}
.on-navy .wordmark .c,.panel-navy .wordmark .c,.panel-grad .wordmark .c{color:var(--muted-on-navy)}

/* ---------------- buttons ---------------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:15px 26px;font-family:var(--sans);font-size:13.5px;font-weight:600;letter-spacing:.01em;
  border:1px solid transparent;border-radius:var(--r-sm);cursor:pointer;transition:.22s ease;white-space:nowrap;
}
.btn svg{transition:transform .22s ease}
.btn:hover svg{transform:translateX(3px)}
.btn-accent{background:var(--b-accent);color:#fff;box-shadow:0 12px 30px -12px rgba(42,75,240,.65)}
.btn-accent:hover{background:var(--accent-deep);box-shadow:0 16px 36px -12px rgba(42,75,240,.7)}
.btn-ink{background:var(--ink);color:#fff}
.btn-ink:hover{background:#000}
.btn-line{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-line:hover{border-color:var(--ink)}
.on-navy .btn-line,.panel-navy .btn-line,.panel-grad .btn-line{color:#fff;border-color:rgba(234,238,248,.32)}
.on-navy .btn-line:hover,.panel-navy .btn-line:hover,.panel-grad .btn-line:hover{border-color:#fff;background:rgba(234,238,248,.06)}
.btn-ivory{background:#fff;color:var(--ink)}
.btn-ivory:hover{background:#fff;transform:translateY(-1px)}
.nav .btn{padding:11px 19px}

/* ---------------- cards ---------------- */
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:34px 32px;transition:border-color .3s ease,transform .3s ease,box-shadow .3s ease;
}
.panel-stone .card,.panel-sand .card{background:#fff}
.card:hover{border-color:rgba(42,75,240,.4);transform:translateY(-3px);box-shadow:0 26px 50px -34px rgba(10,17,36,.45)}
.panel-navy .card{background:var(--navy-soft);border-color:var(--line-on-navy);color:var(--paper-on-navy)}
.panel-navy .card:hover{border-color:rgba(110,139,255,.5)}
.card .idx{font-family:var(--mono);font-size:12px;color:var(--b-accent);font-weight:500;letter-spacing:.12em;text-transform:uppercase}
.panel-navy .card .idx{color:var(--b-accent-on-navy)}
.card h3{margin:15px 0 10px}
.card p{font-size:15.5px;color:var(--muted)}
.panel-navy .card p{color:var(--muted-on-navy)}

/* frosted glass card (on gradient / navy) */
.glass{
  background:rgba(234,238,248,.06);border:1px solid rgba(234,238,248,.16);
  border-radius:14px;padding:22px 22px;backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.glass .gk{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted-on-navy);margin-bottom:10px}
.glass .gv{font-family:var(--display);font-size:30px;font-weight:600;color:#fff;line-height:1;letter-spacing:-.02em}
.glass .gs{font-size:13px;color:#C7D0E6;margin-top:8px}

/* feature line item (editorial spec list) */
.featline{display:grid;grid-template-columns:60px 1fr;gap:22px;padding:30px 0;border-top:1px solid var(--line)}
.featline:last-child{border-bottom:1px solid var(--line)}
.featline .no{font-family:var(--mono);font-size:14px;color:var(--b-accent);font-weight:500;letter-spacing:.06em;padding-top:5px}
.featline h3{font-size:22px;margin-bottom:7px}
.featline p{font-size:16px;color:var(--muted);max-width:62ch}

/* grids */
.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

/* editorial split */
.editorial{display:grid;grid-template-columns:1.05fr .95fr;gap:74px;align-items:center}
.editorial.tight{gap:56px}

/* oversized index number */
.bignum{font-family:var(--display);font-size:clamp(76px,12vw,164px);line-height:.82;color:var(--ink);font-weight:600;letter-spacing:-.05em}
.bignum .small{font-family:var(--mono);font-size:.16em;vertical-align:super;color:var(--b-accent);letter-spacing:.04em;font-weight:500}

/* spec strip — the mono "flight board" rail */
.specstrip{
  display:flex;flex-wrap:wrap;gap:0;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff;
}
.panel-navy .specstrip{background:var(--navy-soft)}
.specstrip > div{
  flex:1 1 0;min-width:170px;padding:24px 26px;border-right:1px solid var(--line);
}
.specstrip > div:last-child{border-right:0}
.specstrip .k{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--runway);margin-bottom:10px}
.specstrip .v{font-family:var(--display);font-size:21px;color:var(--ink);line-height:1.2;font-weight:600;letter-spacing:-.018em}
.panel-navy .specstrip{border-color:var(--line-on-navy)}
.panel-navy .specstrip > div{border-color:var(--line-on-navy)}
.panel-navy .specstrip .v{color:var(--paper-on-navy)}
.panel-navy .specstrip .k{color:var(--muted-on-navy)}

/* quote / pull */
.pull{font-family:var(--display);font-weight:600;font-size:clamp(28px,4.4vw,54px);line-height:1.08;color:var(--ink);letter-spacing:-.034em;max-width:21ch}
.panel-navy .pull,.panel-cta .pull{color:#fff}
.pull .accent{color:var(--b-accent)}
.panel-navy .pull .accent,.panel-cta .pull .accent{color:var(--b-accent-on-navy)}

/* process steps */
.steps{counter-reset:s;border-top:1px solid var(--line)}
.step{display:grid;grid-template-columns:auto 1fr;gap:28px;padding:30px 0;border-bottom:1px solid var(--line);align-items:baseline}
.step .si{font-family:var(--mono);font-size:12px;letter-spacing:.16em;color:var(--b-accent);padding-top:6px;white-space:nowrap}
.step h3{font-size:23px;margin-bottom:6px}
.step p{font-size:16px;color:var(--muted);max-width:64ch}
.panel-navy .step,.panel-navy .steps{border-color:var(--line-on-navy)}
.panel-navy .step p{color:var(--muted-on-navy)}
.panel-navy .step .si{color:var(--b-accent-on-navy)}

/* testimonial / operator feedback cards */
.quotegrid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.qcard{
  background:#fff;border:1px solid var(--line);border-radius:var(--r);
  padding:32px 30px;display:flex;flex-direction:column;gap:20px;transition:border-color .3s,transform .3s,box-shadow .3s;
}
.qcard:hover{transform:translateY(-3px);box-shadow:0 26px 50px -34px rgba(10,17,36,.45);border-color:rgba(42,75,240,.35)}
.panel-navy .qcard{background:var(--navy-soft);border-color:var(--line-on-navy)}
.qcard .mark-q{font-family:var(--display);font-size:46px;line-height:.6;color:var(--b-accent);font-weight:600;height:24px}
.panel-navy .qcard .mark-q{color:var(--b-accent-on-navy)}
.qcard p{font-size:16.5px;color:var(--graphite);line-height:1.5}
.panel-navy .qcard p{color:#C3CCDE}
.qcard .who{display:flex;align-items:center;gap:13px;margin-top:auto}
.qcard .av{width:40px;height:40px;border-radius:50%;background:var(--stone);display:grid;place-items:center;font-family:var(--display);font-weight:600;font-size:15px;color:var(--ink);flex:0 0 auto}
.panel-navy .qcard .av{background:var(--navy);color:var(--paper-on-navy)}
.qcard .who .nm{font-family:var(--display);font-weight:600;font-size:14.5px;color:var(--ink);letter-spacing:-.01em}
.panel-navy .qcard .who .nm{color:var(--paper-on-navy)}
.qcard .who .rl{font-size:12.5px;color:var(--muted);font-family:var(--mono);letter-spacing:.02em}
.panel-navy .qcard .who .rl{color:var(--muted-on-navy)}

/* demo badge — flags fictional/example content */
.demobadge{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--runway);border:1px solid var(--line);border-radius:100px;padding:7px 15px;font-weight:500;
}
.demobadge::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--b-accent);display:inline-block}
.panel-navy .demobadge,.panel-grad .demobadge{color:var(--muted-on-navy);border-color:var(--line-on-navy)}
.panel-navy .demobadge::before,.panel-grad .demobadge::before{background:var(--b-accent-on-navy)}

/* oversized ghost wordmark */
.ghost{
  font-family:var(--display);font-weight:700;letter-spacing:-.05em;line-height:.8;
  font-size:clamp(90px,21vw,300px);white-space:nowrap;
  color:transparent;-webkit-text-stroke:1px rgba(234,238,248,.07);
  background:linear-gradient(180deg,rgba(110,139,255,.10),rgba(110,139,255,0));
  -webkit-background-clip:text;background-clip:text;
  pointer-events:none;user-select:none;
}

/* footer */
footer{background:var(--navy-2);color:var(--muted-on-navy);padding:80px 0 0;position:relative;overflow:hidden}
footer .wrap{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;position:relative;z-index:2}
footer h5{font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--b-accent-on-navy);margin-bottom:18px;font-weight:500}
footer a{display:block;color:var(--muted-on-navy);font-size:15px;padding:5px 0}
footer a:hover{color:var(--paper-on-navy)}
.fineprint{font-size:12.5px;color:#6A7791;line-height:1.6;max-width:46ch}
.footbar{border-top:1px solid var(--line-on-navy);margin-top:50px;padding:24px 0 36px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;font-size:12px;color:#6A7791;font-family:var(--mono);letter-spacing:.02em}
.footghost{position:relative;z-index:1;margin-top:54px;height:clamp(64px,15vw,210px);overflow:hidden;display:flex;align-items:flex-end;justify-content:center}
.footghost .ghost{transform:translateY(28%)}

/* reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* utility */
.center{text-align:center}
.center .lead{margin-left:auto;margin-right:auto}
.maxw-head{max-width:900px}
.maxw-head.center{margin:0 auto}
.mt12{margin-top:12px}.mt24{margin-top:24px}.mt40{margin-top:40px}.mt64{margin-top:64px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.tag-pill{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--b-accent);border:1px solid var(--line);border-radius:100px;padding:8px 16px;font-weight:500;background:#fff}
.panel-navy .tag-pill,.panel-grad .tag-pill{color:var(--b-accent-on-navy);border-color:var(--line-on-navy);background:rgba(234,238,248,.05)}
.tag-pill::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--b-accent);display:inline-block}
.panel-navy .tag-pill::before,.panel-grad .tag-pill::before{background:var(--b-accent-on-navy)}

@media(max-width:980px){
  .editorial{grid-template-columns:1fr;gap:46px}
  .g3,.g4{grid-template-columns:1fr 1fr}
  .quotegrid{grid-template-columns:1fr}
  footer .wrap{grid-template-columns:1fr 1fr}
  .specstrip > div{flex-basis:50%}
}
@media(max-width:680px){
  .nav-links .txt{display:none}
  .nav{padding:14px 20px}
  .nav .btn{padding:10px 15px;font-size:12.5px}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .sec{padding:84px 0}
  .wrap{padding:0 22px}
  footer .wrap{grid-template-columns:1fr}
  .specstrip > div{flex-basis:100%;border-right:0;border-bottom:1px solid var(--line)}
  .specstrip > div:last-child{border-bottom:0}
}
@media(max-width:480px){
  .nav .wordmark{display:none}
  h1{font-size:clamp(40px,11vw,56px)}
}