/* ============================================================
   CHN EscapeOS — Design System
   Dark, cinematic, premium. "Video-game-grade" operator software.
   ============================================================ */

/* ---------- Tokens ---------- */
:root{
  /* Surfaces — near-black with a cool navy undertone */
  --bg:#04050a;
  --bg-deep:#020308;
  --bg-elev:#080a12;
  --bg-2:#0b0e18;
  --panel:rgba(255,255,255,.035);
  --panel-2:rgba(255,255,255,.055);
  --panel-3:rgba(255,255,255,.08);
  --line:rgba(255,255,255,.09);
  --line-soft:rgba(255,255,255,.05);
  --line-strong:rgba(255,255,255,.16);

  /* Ink */
  --ink:#eef1f8;
  --ink-2:#b6bfd4;
  --ink-3:#828ca6;
  --ink-4:#5b6378;

  /* Accents — cinematic blue → violet, cyan support, red warning */
  --blue:#5b8dff;
  --blue-bright:#84a6ff;
  --blue-deep:#3a63d6;
  --cyan:#33e1ea;
  --cyan-deep:#13a7c4;
  --violet:#ab7bff;
  --violet-bright:#c4a0ff;
  --red:#ff5d6c;
  --amber:#f7b955;
  --green:#46e0a0;

  /* Signature gradient */
  --grad: linear-gradient(120deg, var(--blue) 0%, var(--violet) 100%);
  --grad-cv: linear-gradient(120deg, var(--cyan) 0%, var(--blue) 60%, var(--violet) 100%);

  /* Glow shadows */
  --glow-blue: 0 0 0 1px rgba(91,141,255,.35), 0 12px 50px -12px rgba(91,141,255,.55);
  --glow-soft: 0 18px 60px -20px rgba(0,0,0,.8);
  --ring: 0 0 0 1px var(--line);

  /* Type */
  --f-display:"Space Grotesk","Segoe UI",system-ui,sans-serif;
  --f-body:"Manrope","Helvetica Neue",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",monospace;

  --maxw:1240px;
  --maxw-wide:1400px;
  --nav-h:68px;

  --r-sm:10px;
  --r:16px;
  --r-lg:22px;
  --r-xl:28px;
}

/* ---------- Reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html,body{ margin:0; padding:0; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; scroll-padding-top:90px; }
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--f-body);
  font-size:17px;
  line-height:1.62;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  min-height:100vh;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
button{ font-family:inherit; }
::selection{ background:rgba(91,141,255,.32); color:#fff; }

/* Ambient page background: layered nebula glow + grid */
body::before{
  content:""; position:fixed; inset:0; z-index:-2; pointer-events:none;
  background:
    radial-gradient(900px 600px at 12% -5%, rgba(91,141,255,.13), transparent 60%),
    radial-gradient(900px 700px at 92% 6%, rgba(171,123,255,.11), transparent 62%),
    radial-gradient(800px 800px at 50% 120%, rgba(51,225,234,.07), transparent 60%),
    var(--bg);
}
body::after{
  content:""; position:fixed; inset:0; z-index:-1; pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.022) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 78%);
  opacity:.5;
}

/* ---------- Layout ---------- */
.container{ max-width:var(--maxw); margin:0 auto; padding:0 28px; }
.container.wide{ max-width:var(--maxw-wide); }
.section{ padding:clamp(64px,9vw,128px) 0; position:relative; }
.section.tight{ padding:clamp(48px,6vw,80px) 0; }
.center{ text-align:center; }
.stack-sm{ display:flex; flex-direction:column; gap:10px; }

/* ---------- Typography ---------- */
h1,h2,h3,h4{ font-family:var(--f-display); font-weight:600; line-height:1.04; margin:0; letter-spacing:-.02em; color:var(--ink); }
.display{ font-size:clamp(40px,6.6vw,86px); font-weight:600; line-height:1.0; letter-spacing:-.035em; }
h1{ font-size:clamp(38px,5.2vw,68px); letter-spacing:-.03em; }
h2{ font-size:clamp(30px,3.9vw,52px); letter-spacing:-.025em; }
h3{ font-size:clamp(21px,1.7vw,27px); letter-spacing:-.015em; }
h4{ font-size:18px; letter-spacing:-.01em; }
p{ margin:0 0 1em; color:var(--ink-2); }
p:last-child{ margin-bottom:0; }
.lead{ font-size:clamp(18px,1.5vw,22px); line-height:1.55; color:var(--ink-2); }
.muted{ color:var(--ink-3); }
strong{ color:var(--ink); font-weight:600; }

.grad-text{
  background:var(--grad-cv);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}

/* Eyebrow / kicker */
.eyebrow{
  font-family:var(--f-mono);
  font-size:12px; letter-spacing:.28em; text-transform:uppercase;
  color:var(--ink-3);
  display:inline-flex; align-items:center; gap:10px;
}
.eyebrow::before{
  content:""; width:7px; height:7px; border-radius:50%;
  background:var(--grad); box-shadow:0 0 12px rgba(91,141,255,.9);
}
.eyebrow.cyan::before{ background:var(--cyan); box-shadow:0 0 12px var(--cyan); }
.eyebrow.violet::before{ background:var(--violet); box-shadow:0 0 12px var(--violet); }
.eyebrow.red::before{ background:var(--red); box-shadow:0 0 12px var(--red); }

.section-head{ max-width:760px; }
.section-head.center{ margin:0 auto; }
.section-head .eyebrow{ margin-bottom:18px; }
.section-head h2{ margin-bottom:18px; }
.section-head p{ font-size:clamp(17px,1.3vw,20px); color:var(--ink-3); }

/* ---------- Buttons ---------- */
.btn{
  --pad:14px 22px;
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--f-display); font-weight:600; font-size:15px; letter-spacing:.01em;
  padding:var(--pad); border-radius:999px; border:1px solid transparent;
  cursor:pointer; position:relative; white-space:nowrap;
  transition:transform .25s cubic-bezier(.2,.7,.2,1), box-shadow .25s, background .25s, border-color .25s, color .2s;
}
.btn .ico{ font-size:1.05em; transition:transform .25s; }
.btn:hover .ico{ transform:translateX(3px); }
.btn--primary{
  color:#fff;
  background:linear-gradient(120deg,#6a96ff,#a472ff);
  box-shadow:0 10px 34px -10px rgba(122,138,255,.8), inset 0 0 0 1px rgba(255,255,255,.18);
}
.btn--primary:hover{ transform:translateY(-2px); box-shadow:0 16px 44px -10px rgba(122,138,255,.95), inset 0 0 0 1px rgba(255,255,255,.28); }
.btn--ghost{
  color:var(--ink); background:var(--panel);
  border-color:var(--line-strong);
  backdrop-filter:blur(8px);
}
.btn--ghost:hover{ transform:translateY(-2px); border-color:rgba(255,255,255,.34); background:var(--panel-2); }
.btn--sm{ --pad:10px 16px; font-size:13.5px; }
.btn--lg{ --pad:17px 30px; font-size:16.5px; }
.btn:focus-visible{ outline:2px solid var(--cyan); outline-offset:3px; }

.link-arrow{
  display:inline-flex; align-items:center; gap:7px;
  font-family:var(--f-mono); font-size:13px; letter-spacing:.04em;
  color:var(--blue-bright);
}
.link-arrow .ico{ transition:transform .25s; }
.link-arrow:hover .ico{ transform:translateX(4px); }

/* ---------- Glass surfaces & cards ---------- */
.glass{
  background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  backdrop-filter:blur(14px);
  box-shadow:var(--glow-soft);
}
.card{
  position:relative;
  background:linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.014));
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:26px;
  transition:transform .35s cubic-bezier(.2,.7,.2,1), border-color .35s, box-shadow .35s, background .35s;
  overflow:hidden;
}
.card::after{
  /* hover glow that follows top edge */
  content:""; position:absolute; inset:0; border-radius:inherit; pointer-events:none;
  background:radial-gradient(140% 90% at 50% -20%, rgba(91,141,255,.16), transparent 60%);
  opacity:0; transition:opacity .4s;
}
.card:hover{ transform:translateY(-4px); border-color:var(--line-strong); box-shadow:0 26px 70px -28px rgba(0,0,0,.9); }
.card:hover::after{ opacity:1; }

/* Feature card with icon */
.fcard .ficon{
  width:46px; height:46px; border-radius:13px;
  display:grid; place-items:center; margin-bottom:18px;
  background:linear-gradient(150deg, rgba(91,141,255,.22), rgba(171,123,255,.14));
  border:1px solid var(--line-strong);
  color:var(--blue-bright);
}
.fcard .ficon svg{ width:22px; height:22px; }
.fcard h3{ font-size:19px; margin-bottom:9px; }
.fcard h4{ font-family:var(--f-display); font-size:18px; font-weight:600; margin-bottom:9px; }
.fcard p{ font-size:15px; color:var(--ink-3); margin:0; line-height:1.55; }

/* Grids */
.grid{ display:grid; gap:18px; }
.g-2{ grid-template-columns:repeat(2,1fr); }
.g-3{ grid-template-columns:repeat(3,1fr); }
.g-4{ grid-template-columns:repeat(4,1fr); }
.split{ display:grid; grid-template-columns:1fr 1fr; gap:clamp(32px,5vw,72px); align-items:center; }
.split.lean-l{ grid-template-columns:1.05fr .95fr; }
.split.lean-r{ grid-template-columns:.95fr 1.05fr; }

/* Tag / chip / pill */
.chip{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--f-mono); font-size:11.5px; letter-spacing:.08em; text-transform:uppercase;
  padding:6px 12px; border-radius:999px;
  border:1px solid var(--line); background:var(--panel); color:var(--ink-2);
}
.chip .dot{ width:7px; height:7px; border-radius:50%; background:var(--blue); }
.chip.ok .dot{ background:var(--green); box-shadow:0 0 8px var(--green); }
.chip.warn .dot{ background:var(--amber); box-shadow:0 0 8px var(--amber); }
.chip.err .dot{ background:var(--red); box-shadow:0 0 8px var(--red); }

/* Status pill (dashboards) */
.pill{ font-family:var(--f-mono); font-size:10.5px; letter-spacing:.05em; padding:3px 9px; border-radius:999px; text-transform:uppercase; }
.pill.ok{ color:#9af2cb; background:rgba(70,224,160,.14); border:1px solid rgba(70,224,160,.34); }
.pill.warn{ color:#ffd89a; background:rgba(247,185,85,.14); border:1px solid rgba(247,185,85,.34); }
.pill.err{ color:#ffadb4; background:rgba(255,93,108,.14); border:1px solid rgba(255,93,108,.34); }
.pill.info{ color:#bcd0ff; background:rgba(91,141,255,.14); border:1px solid rgba(91,141,255,.34); }

/* KPI / stat */
.stat .num{ font-family:var(--f-display); font-weight:600; font-size:clamp(32px,3.6vw,46px); letter-spacing:-.03em; line-height:1; }
.stat .lbl{ font-family:var(--f-mono); font-size:11.5px; letter-spacing:.16em; text-transform:uppercase; color:var(--ink-3); margin-top:10px; }

/* Divider */
.hr{ height:1px; background:linear-gradient(90deg,transparent,var(--line-strong),transparent); border:0; margin:0; }

/* ---------- Hero scaffold ---------- */
.hero{ position:relative; padding:calc(var(--nav-h) + 56px) 0 clamp(60px,8vw,110px); overflow:hidden; }
.hero-eyebrow{ margin-bottom:22px; }
.hero h1{ margin-bottom:22px; }
.hero .lead{ max-width:60ch; }
.hero-ctas{ display:flex; gap:14px; flex-wrap:wrap; margin-top:34px; }
.hero-meta{ display:flex; gap:26px; flex-wrap:wrap; margin-top:38px; }
.hero-meta .stat .num{ font-size:clamp(26px,2.4vw,34px); }

/* ---------- Reveal animations ---------- */
[data-reveal]{ opacity:0; transform:translateY(26px); transition:opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); will-change:opacity,transform; }
[data-reveal].in{ opacity:1; transform:none; }
[data-reveal][data-reveal="fade"]{ transform:none; }
[data-reveal-delay="1"]{ transition-delay:.08s; }
[data-reveal-delay="2"]{ transition-delay:.16s; }
[data-reveal-delay="3"]{ transition-delay:.24s; }
[data-reveal-delay="4"]{ transition-delay:.32s; }
[data-reveal-delay="5"]{ transition-delay:.40s; }
[data-reveal-delay="6"]{ transition-delay:.48s; }

/* ---------- Navigation ---------- */
.nav{
  position:fixed; top:0; left:0; right:0; z-index:1000; height:var(--nav-h);
  display:flex; align-items:center;
  transition:background .35s, border-color .35s, backdrop-filter .35s;
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:rgba(6,8,14,.72);
  backdrop-filter:blur(18px) saturate(140%);
  border-bottom-color:var(--line);
}
.nav .container{ display:flex; align-items:center; gap:30px; width:100%; }
.brand{ display:inline-flex; align-items:center; gap:11px; font-family:var(--f-display); font-weight:600; font-size:20px; letter-spacing:-.02em; }
.brand .glyph{
  width:30px; height:30px; border-radius:9px; display:grid; place-items:center;
  background:var(--grad); box-shadow:0 6px 20px -6px rgba(122,138,255,.9), inset 0 0 0 1px rgba(255,255,255,.2);
  flex:none;
}
.brand .glyph svg{ width:17px; height:17px; }
.brand .os{ color:var(--ink-3); font-weight:500; }
.nav-links{ display:flex; align-items:center; gap:4px; margin-left:6px; }
.nav-link{
  font-size:14.5px; font-weight:500; color:var(--ink-2); padding:9px 14px; border-radius:999px;
  display:inline-flex; align-items:center; gap:6px; transition:color .2s, background .2s; cursor:pointer;
}
.nav-link:hover, .nav-link.active{ color:var(--ink); background:var(--panel); }
.nav-link .caret{ width:9px; height:9px; opacity:.6; transition:transform .3s; }
.nav-right{ margin-left:auto; display:flex; align-items:center; gap:12px; }
.nav-burger{ display:none; width:42px; height:42px; border-radius:11px; border:1px solid var(--line); background:var(--panel); align-items:center; justify-content:center; cursor:pointer; }
.nav-burger span{ display:block; width:18px; height:2px; background:var(--ink); border-radius:2px; position:relative; }
.nav-burger span::before,.nav-burger span::after{ content:""; position:absolute; left:0; width:18px; height:2px; background:var(--ink); border-radius:2px; transition:transform .3s; }
.nav-burger span::before{ top:-6px; } .nav-burger span::after{ top:6px; }

/* Mega menu */
.mega{
  position:fixed; top:var(--nav-h); left:0; right:0; z-index:999;
  opacity:0; visibility:hidden; transform:translateY(-10px);
  transition:opacity .3s, transform .3s, visibility .3s;
}
.mega.open{ opacity:1; visibility:visible; transform:none; }
.mega-inner{
  max-width:var(--maxw-wide); margin:12px auto 0; padding:28px;
  background:rgba(10,12,20,.92); backdrop-filter:blur(22px) saturate(150%);
  border:1px solid var(--line); border-radius:var(--r-lg);
  box-shadow:0 40px 90px -30px rgba(0,0,0,.9);
  display:grid; grid-template-columns:repeat(5,1fr); gap:14px;
}
.mega-col h5{
  font-family:var(--f-mono); font-size:11px; letter-spacing:.18em; text-transform:uppercase;
  color:var(--ink-4); margin:0 0 12px; padding-bottom:10px; border-bottom:1px solid var(--line-soft);
}
.mega-col a{ display:flex; flex-direction:column; gap:1px; padding:9px 10px; border-radius:11px; transition:background .2s; }
.mega-col a:hover{ background:var(--panel-2); }
.mega-col a .t{ font-size:14px; font-weight:600; color:var(--ink); }
.mega-col a .d{ font-size:12px; color:var(--ink-4); line-height:1.35; }
.mega-col a:hover .t{ color:var(--blue-bright); }

/* Mobile drawer */
.drawer{
  position:fixed; inset:var(--nav-h) 0 0; z-index:998; background:rgba(5,6,11,.97);
  backdrop-filter:blur(20px); padding:24px 24px 60px; overflow-y:auto;
  opacity:0; visibility:hidden; transition:opacity .3s, visibility .3s;
}
.drawer.open{ opacity:1; visibility:visible; }
.drawer h5{ font-family:var(--f-mono); font-size:11px; letter-spacing:.18em; text-transform:uppercase; color:var(--ink-4); margin:24px 0 8px; }
.drawer a{ display:block; padding:12px 4px; font-size:17px; font-weight:600; border-bottom:1px solid var(--line-soft); }

/* ---------- Footer ---------- */
.footer{ border-top:1px solid var(--line); background:linear-gradient(180deg, transparent, rgba(0,0,0,.5)); padding:72px 0 40px; margin-top:40px; }
.footer-grid{ display:grid; grid-template-columns:1.6fr repeat(4,1fr); gap:36px; }
.footer .brand{ font-size:22px; margin-bottom:16px; }
.footer-blurb{ color:var(--ink-3); font-size:14.5px; max-width:34ch; }
.footer h6{ font-family:var(--f-mono); font-size:11px; letter-spacing:.18em; text-transform:uppercase; color:var(--ink-4); margin:0 0 16px; }
.footer ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:11px; }
.footer ul a{ color:var(--ink-3); font-size:14px; transition:color .2s; }
.footer ul a:hover{ color:var(--ink); }
.footer-bottom{ display:flex; justify-content:space-between; align-items:center; gap:20px; flex-wrap:wrap; margin-top:56px; padding-top:24px; border-top:1px solid var(--line-soft); font-family:var(--f-mono); font-size:12px; letter-spacing:.04em; color:var(--ink-4); }

/* ---------- Final CTA band ---------- */
.cta-band{ position:relative; overflow:hidden; }
.cta-card{
  position:relative; text-align:center; padding:clamp(48px,7vw,96px) 28px;
  border-radius:var(--r-xl); border:1px solid var(--line);
  background:
    radial-gradient(120% 120% at 50% -10%, rgba(91,141,255,.18), transparent 60%),
    radial-gradient(120% 120% at 50% 120%, rgba(171,123,255,.16), transparent 60%),
    linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  box-shadow:0 40px 120px -50px rgba(91,141,255,.6);
  overflow:hidden;
}
.cta-card h2{ max-width:18ch; margin:0 auto 16px; }
.cta-card .lead{ max-width:54ch; margin:0 auto 30px; color:var(--ink-2); }
.cta-card .hero-ctas{ justify-content:center; }

/* ---------- Generic illustration frame ---------- */
.viz{
  position:relative; border-radius:var(--r-lg); overflow:hidden;
  border:1px solid var(--line);
  background:linear-gradient(180deg, rgba(13,16,26,.9), rgba(7,9,15,.95));
  box-shadow:0 40px 100px -40px rgba(0,0,0,.9);
}
.viz-pad{ padding:clamp(18px,2.4vw,30px); }

/* Mono label helper */
.mono{ font-family:var(--f-mono); }
.mono-label{ font-family:var(--f-mono); font-size:11px; letter-spacing:.16em; text-transform:uppercase; color:var(--ink-4); }

/* number ticker baseline */
.ticker{ font-variant-numeric:tabular-nums; }

/* ---------- Responsive ---------- */
@media (max-width:1080px){
  .g-4{ grid-template-columns:repeat(2,1fr); }
  .mega-inner{ grid-template-columns:repeat(3,1fr); }
}
@media (max-width:900px){
  .nav-links{ display:none; }
  .nav-burger{ display:flex; }
  .split,.split.lean-l,.split.lean-r{ grid-template-columns:1fr; }
  .g-3{ grid-template-columns:repeat(2,1fr); }
  .footer-grid{ grid-template-columns:1fr 1fr; }
  .footer .brand-col{ grid-column:1 / -1; }
}
@media (max-width:600px){
  .container{ padding:0 18px; }
  .g-2,.g-3,.g-4{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns:1fr 1fr; gap:24px; }
  .hero-meta{ gap:18px; }
}

@media (prefers-reduced-motion:reduce){
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; scroll-behavior:auto !important; }
  [data-reveal]{ opacity:1 !important; transform:none !important; }
}