/* ==========================================================================
   TapEvent — tapevent.in
   Design language lifted from the TapEvent customer keynote:
   near-black canvas, one orange accent, IBM Plex Sans/Mono, line-art SVG.
   ========================================================================== */

:root{
  --gray-950:#0b0b0c; --gray-900:#141416; --gray-800:#1e1e21; --gray-700:#2c2c30;
  --gray-500:#6b6b72; --gray-400:#8f8f96; --gray-300:#c3c3c8; --gray-200:#e2e2e5;
  --gray-100:#f4f4f5; --gray-50:#fafafa; --white:#fff;
  --orange-600:#d93f00; --orange-500:#ff4d00; --orange-400:#ff6a2b;
  --orange-100:#ffe6db; --orange-50:#fff4ee;
  --accent:var(--orange-500);
  --font-sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,monospace;
  --ease:cubic-bezier(.2,0,0,1);
  --container:1120px;
}

*{box-sizing:border-box;margin:0;padding:0;}
/* Smooth anchor scrolling is done in site.js (anchor clicks only) so that
   programmatic window.scrollTo — e.g. the responsive verifier — stays instant. */
body{
  background:var(--gray-950);
  color:var(--gray-100);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  font-feature-settings:"tnum" 1,"lnum" 1;
}
img,svg{max-width:100%;height:auto;}
a{color:inherit;}
::selection{background:var(--orange-500);color:var(--white);}

.container{max-width:var(--container);margin:0 auto;padding:0 clamp(20px,5vw,40px);}

/* ---- typography ---- */
.kicker{
  font-family:var(--font-mono);font-weight:500;
  font-size:clamp(11px,1.1vw,13px);letter-spacing:.28em;text-transform:uppercase;
  color:var(--accent);margin-bottom:clamp(16px,2.4vw,26px);
}
h1{
  font-weight:600;letter-spacing:-.03em;line-height:1.04;
  font-size:clamp(38px,6.2vw,76px);text-wrap:balance;
}
h2{
  font-weight:600;letter-spacing:-.025em;line-height:1.08;
  font-size:clamp(30px,4.4vw,54px);text-wrap:balance;
}
h3{font-weight:600;letter-spacing:-.02em;font-size:clamp(19px,2vw,24px);line-height:1.15;}
.sub{
  margin-top:clamp(16px,2.4vw,28px);
  font-weight:400;line-height:1.45;letter-spacing:-.01em;
  font-size:clamp(17px,1.9vw,23px);color:var(--gray-400);max-width:36ch;
}
.accent{color:var(--accent);}
.muted{color:var(--gray-400);}
.mono{font-family:var(--font-mono);}

/* ---- brand ---- */
.brand{display:inline-flex;align-items:center;gap:.5em;text-decoration:none;}
.brand-mark{width:1.2em;height:1.2em;display:block;flex:none;}
.brand-word{font-weight:700;letter-spacing:-.03em;font-size:1.15em;}

/* ---- nav ---- */
.nav{
  position:sticky;top:0;z-index:60;
  background:rgba(11,11,12,.78);
  -webkit-backdrop-filter:saturate(160%) blur(18px);
  backdrop-filter:saturate(160%) blur(18px);
  border-bottom:1px solid var(--gray-800);
}
.nav .container{display:flex;align-items:center;justify-content:space-between;height:64px;}
.nav-links{display:flex;align-items:center;gap:clamp(16px,2.6vw,32px);list-style:none;}
.nav-links a{
  text-decoration:none;color:var(--gray-300);font-size:15px;font-weight:500;
  transition:color .25s var(--ease);
}
.nav-links a:hover{color:var(--white);}
.nav-cta{
  display:inline-block;background:var(--accent);color:var(--white) !important;
  border-radius:999px;padding:9px 20px;font-weight:600;
  transition:background .25s var(--ease),transform .25s var(--ease);
}
.nav-cta:hover{background:var(--orange-600);}
.nav-cta:active{transform:scale(.96);}
.nav-toggle{
  display:none;background:none;border:0;cursor:pointer;padding:10px;margin-right:-10px;
}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--gray-100);margin:5px 0;
  border-radius:2px;transition:transform .3s var(--ease),opacity .3s;}
@media (max-width:760px){
  .nav-toggle{display:block;}
  .nav-links{
    position:absolute;top:64px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:rgba(11,11,12,.97);border-bottom:1px solid var(--gray-800);
    display:none;padding:8px 0 16px;
  }
  .nav-links.open{display:flex;}
  .nav-links li{padding:0 clamp(20px,5vw,40px);}
  .nav-links a{display:block;padding:13px 0;font-size:17px;}
  .nav-links .nav-cta{margin-top:8px;text-align:center;}
}

/* ---- buttons ---- */
.btn{
  display:inline-block;text-decoration:none;font-weight:600;font-size:16px;
  border-radius:999px;padding:14px 30px;letter-spacing:-.01em;
  transition:background .25s var(--ease),color .25s var(--ease),
             border-color .25s var(--ease),transform .25s var(--ease);
}
.btn:active{transform:scale(.96);}
.btn-primary{background:var(--accent);color:var(--white);}
.btn-primary:hover{background:var(--orange-600);}
.btn-ghost{border:1px solid var(--gray-700);color:var(--gray-100);}
.btn-ghost:hover{border-color:var(--gray-400);}
.light .btn-ghost{border-color:var(--gray-300);color:var(--gray-950);}
.light .btn-ghost:hover{border-color:var(--gray-500);}
.cta-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:clamp(26px,3.4vw,40px);}

/* ---- sections ---- */
.section{padding:clamp(72px,11vw,150px) 0;position:relative;}
.section.light{background:var(--gray-100);color:var(--gray-950);}
.section.light .sub{color:var(--gray-500);}
.section.light .kicker{color:var(--orange-600);}
.section.paper{background:var(--orange-50);color:var(--gray-950);}
.section.paper .sub{color:var(--gray-500);}
.section.paper .kicker{color:var(--orange-600);}
.section-center{text-align:center;}
.section-center .sub{margin-left:auto;margin-right:auto;max-width:44ch;}

/* subtle grid texture on the dark canvas */
.hero{
  padding:clamp(84px,12vw,170px) 0 clamp(72px,10vw,140px);
  position:relative;overflow:hidden;
  background:
    radial-gradient(1000px 480px at 80% -10%, rgba(255,77,0,.13), transparent 60%),
    var(--gray-950);
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(var(--gray-900) 1px, transparent 1px),
    linear-gradient(90deg, var(--gray-900) 1px, transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(720px 480px at 72% 18%, rgba(0,0,0,.9), transparent 72%);
  mask-image:radial-gradient(720px 480px at 72% 18%, rgba(0,0,0,.9), transparent 72%);
}
.hero .container{
  position:relative;display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);
  gap:clamp(32px,6vw,72px);align-items:center;
}
@media (max-width:900px){
  .hero .container{grid-template-columns:1fr;}
  .hero-visual{order:-1;margin:0 auto;}
}
.hero h1{max-width:none;font-size:clamp(36px,5.2vw,56px);}
.hero-note{
  margin-top:clamp(22px,3vw,34px);font-family:var(--font-mono);
  font-size:13px;letter-spacing:.06em;color:var(--gray-500);
}
.hero-note strong{color:var(--gray-300);font-weight:500;}

/* ---- tap visual (rings) ---- */
.tapwrap{
  position:relative;display:flex;align-items:center;justify-content:center;
  width:min(60vw,320px);height:min(60vw,320px);margin:0 auto;
}
.tapcore{
  width:33%;height:33%;border-radius:50%;background:var(--accent);
  box-shadow:0 0 60px rgba(255,77,0,.55);z-index:2;
}
.ring{position:absolute;inset:0;border-radius:50%;border:2px solid var(--accent);opacity:0;}
@media (prefers-reduced-motion:no-preference){
  .ring{animation:ping 2.6s var(--ease) infinite;}
  .ring:nth-child(2){animation-delay:.65s;}
  .ring:nth-child(3){animation-delay:1.3s;}
}
@keyframes ping{
  0%{transform:scale(.34);opacity:.9;}
  80%{opacity:0;}
  100%{transform:scale(1);opacity:0;}
}

/* ---- line-art illustrations ---- */
.illus{display:block;margin-bottom:clamp(22px,3.2vw,40px);stroke-linecap:round;stroke-linejoin:round;}
.illus--sheet{height:clamp(120px,18vw,190px);width:auto;}
.illus--queue{width:min(100%,480px);height:auto;}
.illus--reuse{width:min(100%,460px);height:auto;}
.illus--shield{height:clamp(130px,20vw,190px);width:auto;}
.illus--bars{width:min(80%,320px);height:auto;}
.illus--phone{height:clamp(150px,24vw,210px);width:auto;}
.illus-center{margin-left:auto;margin-right:auto;}

/* ---- split rows (illustration + copy) ---- */
.split{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  gap:clamp(36px,6vw,80px);align-items:center;
}
@media (max-width:820px){.split{grid-template-columns:1fr;}}
.split .illus{margin-bottom:0;}
.split-art{display:flex;justify-content:center;}

/* ---- chips ---- */
.chips{display:flex;flex-wrap:wrap;gap:12px;margin-top:clamp(24px,3.4vw,40px);}
.section-center .chips{justify-content:center;}
.chip{
  font-family:var(--font-mono);font-size:clamp(13px,1.4vw,16px);font-weight:500;
  letter-spacing:.01em;color:var(--gray-100);
  border:1px solid var(--gray-700);border-radius:999px;
  padding:.55em 1.15em;background:var(--gray-900);white-space:nowrap;
}
.chip.hot{border-color:var(--accent);color:var(--accent);background:rgba(255,77,0,.08);}
.light .chip,.paper .chip{
  color:var(--gray-950);background:var(--white);border-color:var(--gray-200);
}
.light .chip.hot,.paper .chip.hot{
  color:var(--orange-600);border-color:var(--orange-400);background:var(--orange-50);
}

/* ---- steps (how it works) ---- */
.steps{
  display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(24px,3.4vw,56px);
  margin-top:clamp(36px,5vw,64px);
}
@media (max-width:760px){.steps{grid-template-columns:1fr;gap:36px;}}
.step-ico{width:44px;height:44px;display:block;margin-bottom:16px;
  stroke-linecap:round;stroke-linejoin:round;}
.step-n{
  font-family:var(--font-mono);font-weight:600;color:var(--accent);
  font-size:clamp(12px,1.2vw,14px);letter-spacing:.1em;margin-bottom:.7em;
}
.light .step-n{color:var(--orange-600);}
.step p{margin-top:.5em;color:var(--gray-500);font-size:clamp(15px,1.5vw,17px);line-height:1.5;}

/* ---- feature grid ---- */
.features{
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;
  margin-top:clamp(36px,5vw,64px);
}
@media (max-width:960px){.features{grid-template-columns:repeat(2,1fr);}}
@media (max-width:620px){.features{grid-template-columns:1fr;}}
.feature{
  border:1px solid var(--gray-800);border-radius:18px;background:var(--gray-900);
  padding:clamp(24px,3vw,32px);
  transition:border-color .3s var(--ease),transform .3s var(--ease);
}
@media (hover:hover) and (pointer:fine){
  .feature:hover{border-color:var(--gray-700);transform:translateY(-2px);}
}
.feature-ico{width:40px;height:40px;display:block;margin-bottom:18px;
  stroke-linecap:round;stroke-linejoin:round;}
.feature h3{font-size:clamp(18px,1.8vw,21px);}
.feature p{margin-top:.55em;color:var(--gray-500);font-size:15.5px;line-height:1.5;}

/* ---- stats strip ---- */
.stats{
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;
  margin-top:clamp(36px,5vw,60px);
}
@media (max-width:640px){.stats{grid-template-columns:1fr;}}
.stat{border-top:2px solid var(--gray-800);padding-top:18px;}
.paper .stat{border-color:rgba(217,63,0,.25);}
.stat-v{
  font-family:var(--font-mono);font-weight:600;letter-spacing:-.02em;
  font-size:clamp(34px,4.4vw,52px);line-height:1;color:var(--accent);
}
.paper .stat-v{color:var(--orange-600);}
.stat-k{margin-top:10px;font-size:15px;color:var(--gray-500);max-width:24ch;}

/* ---- use cases ---- */
.usecases{
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;
  margin-top:clamp(36px,5vw,64px);text-align:left;
}
@media (max-width:960px){.usecases{grid-template-columns:repeat(2,1fr);}}
@media (max-width:620px){.usecases{grid-template-columns:1fr;}}
.usecase{
  border:1px solid var(--gray-200);border-radius:18px;background:var(--white);
  padding:clamp(22px,2.8vw,30px);
}
.usecase h3{font-size:19px;}
.usecase p{margin-top:.5em;color:var(--gray-500);font-size:15px;line-height:1.5;}
.usecase .uc-tag{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--orange-600);display:block;margin-bottom:12px;
}

/* ---- closing CTA ---- */
.close-cta{
  background:
    radial-gradient(800px 400px at 50% 120%, rgba(255,77,0,.18), transparent 65%),
    var(--gray-950);
}
.contact-line{
  margin-top:clamp(24px,3.4vw,40px);font-family:var(--font-mono);
  font-size:clamp(13px,1.5vw,17px);color:var(--gray-400);letter-spacing:.02em;
}
.contact-line a{color:var(--gray-100);text-decoration:none;border-bottom:1px solid var(--gray-700);}
.contact-line a:hover{border-color:var(--accent);}

/* ---- contact page ---- */
.contact-card{
  margin-top:clamp(32px,4vw,48px);
  border:1px solid var(--gray-800);border-radius:18px;background:var(--gray-900);
  padding:clamp(26px,3.4vw,40px);
  display:grid;grid-template-columns:max-content 1fr;gap:16px 32px;align-items:baseline;
  max-width:560px;
}
@media (max-width:520px){.contact-card{grid-template-columns:1fr;gap:4px;}
  .contact-card dd{margin-bottom:14px;}}
.contact-card dt{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--gray-500);
}
.contact-card dd{font-size:18px;}
.contact-card a{color:var(--gray-100);text-decoration:none;border-bottom:1px solid var(--gray-700);}
.contact-card a:hover{border-color:var(--accent);}

/* ---- footer ---- */
.footer{border-top:1px solid var(--gray-800);padding:clamp(44px,6vw,72px) 0 40px;}
.footer .brand{font-size:17px;}
.foot-grid{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;
  margin-top:32px;
}
@media (max-width:820px){.foot-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:480px){.foot-grid{grid-template-columns:1fr;}}
.footer h4{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--gray-500);margin-bottom:14px;font-weight:500;
}
.footer ul{list-style:none;}
.footer ul li{margin-bottom:10px;}
.footer ul a{text-decoration:none;color:var(--gray-300);font-size:15px;}
.footer ul a:hover{color:var(--white);}
.foot-tagline{color:var(--gray-500);font-size:15px;max-width:34ch;margin-top:14px;}
.foot-legal{
  margin-top:44px;padding-top:22px;border-top:1px solid var(--gray-800);
  display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;
  font-size:13.5px;color:var(--gray-500);
}
.foot-legal a{color:var(--gray-400);text-decoration:none;}
.foot-legal a:hover{color:var(--white);}

/* comfortable tap targets (>=44px) on touch-sized viewports */
@media (max-width:768px){
  .footer ul li{margin-bottom:0;}
  .footer ul a{display:block;padding:13px 0;}
  .footer .brand{padding:8px 0;}
  .foot-legal a{display:inline-block;padding:13px 0;}
}

/* ---- scroll reveal ---- */
.reveal{opacity:1;transform:none;}
@media (prefers-reduced-motion:no-preference){
  .js .reveal{opacity:0;transform:translateY(18px);
    transition:opacity .7s var(--ease),transform .8s var(--ease);}
  .js .reveal.in{opacity:1;transform:none;}
}

/* ---- 404 ---- */
.error-hero{min-height:70vh;display:flex;align-items:center;}