/* ============================================================
   IMERSIV — design system
   Brand Guidelines V1.0 · monochrome, contrast not colour
   ============================================================ */

:root{
  --ink:#0A0A0A;
  --obsidian:#141414;
  --graphite:#2A2A2A;
  --ash:#63635E;        /* readable secondary on light */
  --ash-dark:#9C9C97;   /* secondary on dark surfaces */
  --fog:#F4F3F0;
  --white:#FFFFFF;

  --line-dark:rgba(255,255,255,.12);
  --line-light:rgba(10,10,10,.12);

  --display:"Space Grotesk",system-ui,sans-serif;
  --body:"IBM Plex Sans",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,monospace;

  --max:1200px;
  --gut:clamp(20px,5vw,64px);
  --ease:cubic-bezier(.16,.84,.44,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--white);
  color:var(--ink);
  font-family:var(--body);
  font-size:16px;
  line-height:1.65;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit}
::selection{background:var(--ink);color:var(--white)}

/* ---------- type ---------- */
h1,h2,h3,h4{font-family:var(--display);font-weight:700;letter-spacing:-.025em;margin:0;text-wrap:balance}
h1{font-size:clamp(2.5rem,6.4vw,4.75rem);line-height:1.02}
h2{font-size:clamp(1.85rem,3.6vw,2.5rem);line-height:1.1}
h3{font-size:clamp(1.15rem,1.6vw,1.5rem);line-height:1.25;font-weight:500}
h4{font-size:1.0625rem;line-height:1.35;font-weight:500;letter-spacing:-.01em}
p{margin:0 0 1.15em}
p:last-child{margin-bottom:0}

.eyebrow{
  font-family:var(--mono);font-size:.6875rem;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--ash);
  margin:0 0 20px;display:block;
}
.lead{font-size:clamp(1.0625rem,1.5vw,1.25rem);line-height:1.6;max-width:56ch}
.muted{color:#55554F}
.dark .muted,.hero .muted,.cta-band .muted,.price-card.feat .muted{color:#ADADA7}
.tight{max-width:62ch}

/* ---------- layout ---------- */
.wrap{max-width:var(--max);margin:0 auto;padding:0 var(--gut)}
section{position:relative}
.sec{padding:clamp(64px,9vw,120px) 0}
.sec-sm{padding:clamp(48px,6vw,80px) 0}
.dark{background:var(--ink);color:var(--white)}
.dark,.hero,.ftr,.cta-band,.hdr,.price-card.feat,.chat-hd{--ash:var(--ash-dark)}
.light{background:var(--fog)}
.rule{height:1px;background:var(--line-light);border:0;margin:0}
.dark .rule{background:var(--line-dark)}

.grid{display:grid;gap:clamp(20px,2.5vw,28px)}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.split{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(32px,6vw,80px);align-items:start}
.stack-lg{display:grid;gap:clamp(32px,5vw,56px)}

/* grid texture for dark sections */
.mesh::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(var(--line-dark) 1px,transparent 1px),
                   linear-gradient(90deg,var(--line-dark) 1px,transparent 1px);
  background-size:80px 80px;
  opacity:.5;
  mask-image:radial-gradient(120% 90% at 65% 15%,#000 0%,transparent 78%);
  -webkit-mask-image:radial-gradient(120% 90% at 65% 15%,#000 0%,transparent 78%);
}
.mesh > *{position:relative;z-index:1}

/* ---------- header ---------- */
.hdr{
  position:sticky;top:0;z-index:60;
  background:rgba(10,10,10,.82);
  backdrop-filter:saturate(140%) blur(14px);
  -webkit-backdrop-filter:saturate(140%) blur(14px);
  border-bottom:1px solid var(--line-dark);
  color:var(--white);
}
.hdr-in{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px;height:80px}
.hdr-end{display:flex;align-items:center;justify-content:flex-end;gap:12px}
.mark{display:inline-flex;align-items:center;text-decoration:none;flex:none}
.mark svg{height:29px;width:auto;display:block}
.nav{display:flex;align-items:center;justify-content:center;gap:4px}
.nav a.nav-cta-m{display:none}
.nav a{
  font-size:.875rem;text-decoration:none;color:#C4C4BF;
  padding:9px 12px;border-radius:6px;transition:color .2s var(--ease),background .2s var(--ease);
}
.nav a:hover{color:var(--white);background:rgba(255,255,255,.07)}
.nav a[aria-current="page"]{color:var(--white)}
.btn.btn-p.hdr-cta,.nav a.btn{padding:13px 20px}
.hdr-cta{color:var(--ink);background:var(--white)}
.hdr-cta:hover{background:#E4E3DF}
.nav a.btn-p{color:var(--ink);background:var(--white)}
.nav a.btn-p:hover{color:var(--ink);background:#E4E3DF}

.burger{
  display:none;background:none;border:1px solid var(--line-dark);color:var(--white);
  width:42px;height:38px;border-radius:6px;cursor:pointer;align-items:center;justify-content:center;
}
.burger span{display:block;width:16px;height:1.5px;background:currentColor;position:relative}
.burger span::before,.burger span::after{
  content:"";position:absolute;left:0;width:16px;height:1.5px;background:currentColor;
  transition:transform .25s var(--ease);
}
.burger span::before{top:-5px}.burger span::after{top:5px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--body);font-size:.9375rem;font-weight:600;
  text-decoration:none;padding:13px 22px;border-radius:7px;
  border:1.5px solid transparent;cursor:pointer;
  transition:transform .2s var(--ease),background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
  white-space:nowrap;line-height:1;
}
.btn-p{background:var(--white);color:var(--ink);border-color:var(--white)}
.btn-p:hover{background:#E4E3DF;border-color:#E4E3DF;transform:translateY(-1px)}
.btn-s{background:transparent;color:var(--white);border-color:rgba(255,255,255,.34)}
.btn-s:hover{border-color:var(--white);background:rgba(255,255,255,.07);transform:translateY(-1px)}
.on-light .btn-p,.btn-dark{background:var(--ink);color:var(--white);border-color:var(--ink)}
.on-light .btn-p:hover,.btn-dark:hover{background:var(--graphite);border-color:var(--graphite)}
.on-light .btn-s{color:var(--ink);border-color:rgba(10,10,10,.28)}
.on-light .btn-s:hover{border-color:var(--ink);background:rgba(10,10,10,.04)}
.btns{display:flex;flex-wrap:wrap;gap:12px;align-items:center}

.tlink{
  font-family:var(--mono);font-size:.75rem;letter-spacing:.14em;text-transform:uppercase;
  text-decoration:none;display:inline-flex;align-items:center;gap:8px;font-weight:500;
  border-bottom:1px solid currentColor;padding-bottom:3px;transition:gap .2s var(--ease),opacity .2s var(--ease);
}
.tlink:hover{gap:14px;opacity:.7}

/* ---------- hero ---------- */
.hero{background:var(--ink);color:var(--white);position:relative;overflow:hidden;isolation:isolate}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.38;filter:grayscale(1) contrast(1.06)}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,var(--ink) 4%,rgba(10,10,10,.92) 40%,rgba(10,10,10,.55) 100%);
}
.hero-in{position:relative;z-index:2;padding-top:clamp(80px,13vw,160px);padding-bottom:clamp(64px,9vw,112px)}
.hero-in>*{max-width:960px}
.hero h1{max-width:19ch}
.hero .lead{margin-top:26px;color:#C4C4BF}
.hero .btns{margin-top:40px}
.hero-sub{padding-top:clamp(56px,8vw,96px);padding-bottom:clamp(56px,8vw,88px)}
.hero-sub h1{font-size:clamp(2.25rem,5vw,3.75rem);max-width:22ch}

/* breadcrumb */
.crumbs{font-family:var(--mono);font-size:.6875rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ash);margin-bottom:22px}
.crumbs a{text-decoration:none;color:var(--ash);transition:color .2s}
.crumbs a:hover{color:var(--white)}
.crumbs span{margin:0 8px;opacity:.5}

/* ---------- cards ---------- */
.card{
  background:var(--white);border:1px solid var(--line-light);border-radius:12px;
  padding:clamp(22px,2.4vw,30px);
  transition:transform .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.card h3,.card h4{margin-bottom:10px}
.card p{font-size:.9375rem;color:#55554F;margin:0}
.light .card{background:var(--white)}
.dark .card{background:var(--obsidian);border-color:var(--line-dark)}
.dark .card p{color:#ADADA7}
a.card{text-decoration:none;display:block}
a.card:hover{transform:translateY(-3px);border-color:rgba(10,10,10,.34);box-shadow:0 14px 40px -24px rgba(10,10,10,.35)}
.dark a.card:hover{border-color:rgba(255,255,255,.34);box-shadow:none}

.ico{
  width:38px;height:38px;border-radius:9px;background:var(--ink);color:var(--white);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;flex:none;
}
.dark .ico{background:var(--white);color:var(--ink)}
.ico svg{width:19px;height:19px}

/* numbered steps */
.steps{counter-reset:s;display:grid;gap:0}
.step{
  counter-increment:s;display:grid;grid-template-columns:64px minmax(0,1fr);
  gap:clamp(16px,3vw,40px);padding:26px 0;border-top:1px solid var(--line-light);align-items:start;
}
.dark .step{border-top-color:var(--line-dark)}
.step:last-child{border-bottom:1px solid var(--line-light)}
.dark .step:last-child{border-bottom-color:var(--line-dark)}
.step::before{
  content:"0" counter(s);font-family:var(--mono);font-size:.75rem;letter-spacing:.12em;
  color:var(--ash);padding-top:5px;
}
.step h4{margin-bottom:6px}
.step p{font-size:.9375rem;color:#55554F;margin:0}
.dark .step p{color:#ADADA7}

/* feature list */
.flist{list-style:none;margin:0;padding:0;display:grid;gap:16px}
.flist li{display:grid;grid-template-columns:20px minmax(0,1fr);gap:14px;font-size:.9375rem;line-height:1.6}
.flist li::before{
  content:"";width:9px;height:9px;margin-top:9px;border:1.5px solid currentColor;
  transform:rotate(45deg);opacity:.55;
}
.flist strong{font-weight:600}

/* stat row */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,3vw,40px)}
.stat .n{font-family:var(--display);font-weight:700;font-size:clamp(2rem,4vw,3rem);letter-spacing:-.03em;line-height:1}
.stat .l{font-family:var(--mono);font-size:.6875rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ash);margin-top:12px}

/* ---------- pricing ---------- */
.price-card{
  border:1px solid var(--line-light);border-radius:12px;background:var(--white);
  padding:clamp(24px,2.6vw,32px);display:flex;flex-direction:column;gap:18px;
}
.price-card.feat{background:var(--ink);color:var(--white);border-color:var(--ink);position:relative}
.price-card.feat p,.price-card.feat .flist{color:#C4C4BF}
.price-card .tag{font-family:var(--mono);font-size:.6875rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ash)}
.price-card .amt{font-family:var(--display);font-weight:700;font-size:clamp(2rem,3.4vw,2.6rem);letter-spacing:-.03em;line-height:1}
.price-card .amt small{font-family:var(--mono);font-size:.75rem;font-weight:500;letter-spacing:.1em;color:var(--ash);margin-left:6px;text-transform:uppercase}
.price-card .btn{margin-top:auto;justify-content:center}
.badge{
  position:absolute;top:-1px;right:22px;transform:translateY(-50%);
  font-family:var(--mono);font-size:.625rem;letter-spacing:.16em;text-transform:uppercase;
  background:var(--white);color:var(--ink);padding:5px 10px;border-radius:4px;font-weight:500;
}

/* ---------- table ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:.9375rem}
.tbl th{
  text-align:left;font-family:var(--mono);font-size:.6875rem;letter-spacing:.16em;text-transform:uppercase;
  font-weight:500;background:var(--ink);color:var(--white);padding:13px 18px;
}
.tbl td{padding:15px 18px;border-bottom:1px solid var(--line-light);vertical-align:top}
.tbl tbody tr:last-child td{border-bottom:0}
.tbl td:first-child{font-weight:600;width:26%}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line-light);border-radius:12px;background:var(--white)}

/* ---------- quote ---------- */
.quote{border-left:2px solid currentColor;padding:6px 0 6px 24px}
.quote p{font-family:var(--display);font-weight:500;font-size:clamp(1.25rem,2.3vw,1.75rem);line-height:1.3;letter-spacing:-.02em;margin:0}
.quote cite{display:block;margin-top:16px;font-family:var(--mono);font-size:.6875rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ash);font-style:normal}

/* ---------- media ---------- */
.shot{border-radius:12px;overflow:hidden;background:var(--obsidian);border:1px solid var(--line-light)}
.shot img{width:100%;height:100%;object-fit:cover;filter:grayscale(1) contrast(1.05)}
.ratio-43{aspect-ratio:4/3}
.ratio-169{aspect-ratio:16/9}

/* ---------- article list ---------- */
.post{
  display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px;align-items:baseline;
  padding:26px 0;border-top:1px solid var(--line-light);text-decoration:none;
  transition:padding-left .25s var(--ease);
}
.post:last-of-type{border-bottom:1px solid var(--line-light)}
.post:hover{padding-left:10px}
.post h3{font-weight:500}
.post .meta{font-family:var(--mono);font-size:.6875rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ash);white-space:nowrap}
.post p{font-size:.9375rem;color:#55554F;margin:8px 0 0;max-width:62ch}

/* ---------- cta band ---------- */
.cta-band{background:var(--ink);color:var(--white);position:relative;overflow:hidden}
.cta-in{padding:clamp(56px,8vw,96px) 0;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:clamp(28px,5vw,64px);align-items:end}
.cta-in h2{max-width:22ch}
.cta-in p{color:#ADADA7;margin-top:14px;max-width:46ch;font-size:1rem}

/* ---------- form ---------- */
.form{display:grid;gap:18px}
.field{display:grid;gap:8px}
.field label{font-family:var(--mono);font-size:.6875rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ash)}
.field input,.field textarea,.field select{
  font-family:var(--body);font-size:.9375rem;color:var(--ink);background:var(--white);
  border:1px solid var(--line-light);border-radius:8px;padding:13px 15px;width:100%;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.field textarea{min-height:130px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:none;border-color:var(--ink);box-shadow:0 0 0 3px rgba(10,10,10,.08);
}
.form-note{font-size:.8125rem;color:var(--ash)}
.form-ok{
  display:none;border:1px solid var(--line-light);border-left:2px solid var(--ink);
  border-radius:8px;padding:18px 20px;background:var(--white);font-size:.9375rem;
}
.form-ok.on{display:block}

/* ---------- footer ---------- */
.ftr{background:var(--ink);color:var(--white);border-top:1px solid var(--line-dark)}
.ftr-in{padding:clamp(56px,7vw,80px) 0 0;display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:clamp(28px,4vw,48px)}
.ftr h5{font-family:var(--mono);font-size:.6875rem;letter-spacing:.18em;text-transform:uppercase;color:var(--ash);font-weight:500;margin:0 0 18px}
.ftr ul{list-style:none;margin:0;padding:0;display:grid;gap:11px}
.ftr a{font-size:.9375rem;text-decoration:none;color:#C4C4BF;transition:color .2s}
.ftr a:hover{color:var(--white)}
.ftr-brand p{font-size:.9375rem;color:#ADADA7;margin-top:18px;max-width:34ch}
.ftr-brand svg{height:34px;width:auto}
.ftr-bot{
  margin-top:clamp(40px,6vw,64px);border-top:1px solid var(--line-dark);
  padding:24px 0 30px;display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;
  font-family:var(--mono);font-size:.6875rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ash);
}
.ftr-bot a{color:var(--ash);text-decoration:none}
.ftr-bot a:hover{color:var(--white)}

/* ---------- prose (legal) ---------- */
.prose{max-width:70ch}
.prose h2{font-size:clamp(1.35rem,2vw,1.6rem);margin:48px 0 14px}
.prose h2:first-child{margin-top:0}
.prose p,.prose li{font-size:.9375rem;line-height:1.7}
.prose ul{padding-left:20px;margin:0 0 1.15em}
.prose li{margin-bottom:8px}

/* ---------- chat widget ---------- */
.chat-btn{
  position:fixed;right:20px;bottom:20px;z-index:80;
  display:flex;align-items:center;gap:10px;
  background:var(--ink);color:var(--white);border:1px solid rgba(255,255,255,.18);
  border-radius:999px;padding:13px 20px;cursor:pointer;
  font-family:var(--body);font-size:.875rem;font-weight:600;
  box-shadow:0 18px 44px -18px rgba(10,10,10,.6);
  transition:transform .28s var(--ease),opacity .2s var(--ease);
}
.chat-btn:hover{transform:translateY(-2px)}
.chat-btn.retract{transform:translateY(140%);opacity:0;pointer-events:none}
@media (prefers-reduced-motion:reduce){.chat-btn.retract{transition:none}}
.chat-btn svg{width:17px;height:17px}
.chat-panel{
  position:fixed;right:20px;bottom:20px;z-index:90;width:min(376px,calc(100vw - 32px));
  height:min(580px,calc(100vh - 40px));
  background:var(--white);border:1px solid rgba(10,10,10,.16);border-radius:16px;
  box-shadow:0 34px 80px -30px rgba(10,10,10,.5);
  display:none;flex-direction:column;overflow:hidden;
}
.chat-panel.on{display:flex}
.chat-hd{background:var(--ink);color:var(--white);padding:16px 18px;display:flex;align-items:center;gap:12px;flex:none}
.chat-hd .dot{width:7px;height:7px;border-radius:50%;background:#fff;flex:none}
.chat-hd .t{font-family:var(--display);font-weight:500;font-size:.9375rem}
.chat-hd .s{font-family:var(--mono);font-size:.625rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ash);margin-top:2px}
.chat-x{margin-left:auto;background:none;border:0;color:#BFBFBA;cursor:pointer;font-size:20px;line-height:1;padding:4px}
.chat-x:hover{color:#fff}
.chat-body{flex:1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:12px;background:var(--fog)}
.msg{max-width:86%;font-size:.875rem;line-height:1.55;padding:11px 14px;border-radius:12px;white-space:pre-line}
.msg.bot{background:var(--white);border:1px solid var(--line-light);border-bottom-left-radius:4px}
.msg.me{background:var(--ink);color:var(--white);align-self:flex-end;border-bottom-right-radius:4px}
.chips{display:flex;flex-wrap:wrap;gap:8px;padding:0 18px 16px;background:var(--fog);flex:none}
.chip{
  font-family:var(--body);font-size:.8125rem;font-weight:500;
  background:var(--white);border:1px solid rgba(10,10,10,.18);border-radius:999px;
  padding:8px 13px;cursor:pointer;transition:background .18s,border-color .18s;
}
.chip:hover{background:var(--ink);color:var(--white);border-color:var(--ink)}
.chat-ft{padding:11px 14px;border-top:1px solid var(--line-light);display:flex;gap:9px;flex:none;background:var(--white)}
.chat-ft input{flex:1;border:1px solid var(--line-light);border-radius:8px;padding:10px 12px;font-family:var(--body);font-size:.875rem}
.chat-ft input:focus{outline:none;border-color:var(--ink)}
.chat-ft button{background:var(--ink);color:#fff;border:0;border-radius:8px;width:40px;cursor:pointer;display:grid;place-items:center}
.chat-ft button svg{width:16px;height:16px}
.chat-demo{
  font-family:var(--mono);font-size:.5625rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ash);text-align:center;padding:0 18px 12px;background:var(--fog);flex:none;
}

/* ---------- reveal ---------- */
.rv{opacity:0;transform:translateY(18px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .rv{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* ---------- responsive ---------- */
@media (max-width:1000px){
  .ftr-in{grid-template-columns:1fr 1fr}
  .ftr-brand{grid-column:1/-1}
  .mark svg{height:25px}
  .ftr-brand svg{height:29px}
}
@media (max-width:860px){
  .hdr-in{grid-template-columns:auto 1fr}
  .hdr-cta{display:none}
  .nav a.nav-cta-m{display:inline-flex}
  .nav{grid-column:1/-1}
  .nav{
    position:fixed;inset:80px 0 auto;background:var(--ink);
    border-bottom:1px solid var(--line-dark);
    flex-direction:column;align-items:stretch;gap:2px;padding:14px var(--gut) 22px;
    display:none;
  }
  .nav.on{display:flex}
  .nav a{padding:13px 4px;font-size:1rem}
  .nav .btn{margin:10px 0 0;justify-content:center}
  .burger{display:flex}
  .g3,.g4{grid-template-columns:repeat(2,1fr)}
  .split{grid-template-columns:1fr}
  .cta-in{grid-template-columns:1fr;align-items:start}
  .stats{grid-template-columns:1fr 1fr}
}
@media (max-width:620px){
  .g2,.g3,.g4{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr}
  .post{grid-template-columns:1fr}
  .post .meta{order:-1}
  .tbl td:first-child{width:auto}
  .step{grid-template-columns:44px minmax(0,1fr)}
  .chat-btn span{display:none}
  .chat-btn{padding:14px;border-radius:50%;right:14px;bottom:14px;
    box-shadow:0 0 0 3px rgba(244,243,240,.9),0 14px 34px -14px rgba(10,10,10,.7)}
}

/* dark-section table */
.dark .tbl-wrap{border-color:var(--line-dark)}
.dark .tbl td{border-bottom-color:var(--line-dark)}
.dark .tbl th{background:var(--graphite)}
.chat-panel.busy .chat-ft{opacity:.55}
.chat-panel.busy .chat-ft input,.chat-panel.busy .chat-ft button{cursor:not-allowed}
.msg[data-typing]{letter-spacing:.12em;color:var(--ash)}