/* Kavach landing page.
   Layout: sticky bar → dark "night corridor" hero with live map → alternating bands reading like a transport manifest
   (field labels, ADR plates, numbered steps where order matters) → dark call-to-action → footer. */
:root{
  --bg:#F2F4F3; --surface:#FFFFFF; --ink:#15201E; --muted:#56655F; --line:#D4DBD8; --soft:#E7ECEA;
  --accent:#E06A07; --accent-ink:#1A1100;
  --ok:#1C8550; --warn:#A96F12; --crit:#BF3528;
  --c-gas:#2F7DBF; --c-flam:#D0461F; --c-toxic:#7B4BB8; --c-corr:#1E8C80;
  /* the hero and dark bands stay dark in both themes */
  --night:#0F1716; --night-2:#16211F; --night-line:#2A3735; --night-ink:#E4ECE9; --night-muted:#93A39E; --night-land:#1C2826; --night-edge:#3A4A46;
  --f-display:"Barlow Condensed","Arial Narrow",Arial,sans-serif;
  --f-body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  --f-deva:"IBM Plex Sans Devanagari","Nirmala UI","Mangal",sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0E1514; --surface:#162020; --ink:#E4ECE9; --muted:#93A39E; --line:#2A3735; --soft:#1D2928;
  --accent:#F08A2B; --ok:#3DBA7B; --warn:#E2A94C; --crit:#EC6B5E;
  --c-gas:#5EA6E6; --c-flam:#F07650; --c-toxic:#A884E0; --c-corr:#45BFB1; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0E1514; --surface:#162020; --ink:#E4ECE9; --muted:#93A39E; --line:#2A3735; --soft:#1D2928;
  --accent:#F08A2B; --ok:#3DBA7B; --warn:#E2A94C; --crit:#EC6B5E;
  --c-gas:#5EA6E6; --c-flam:#F07650; --c-toxic:#A884E0; --c-corr:#45BFB1; color-scheme:dark}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
:root{padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--night)}
img{max-width:100%}
[hidden]{display:none!important}
a{color:inherit}
.wrap{max-width:1200px;margin:0 auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:var(--accent-ink);padding:8px 12px;z-index:50}
.skip:focus{left:12px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

h1,h2,h3{font-family:var(--f-display);font-weight:700;text-transform:uppercase;letter-spacing:.01em;text-wrap:balance;margin:0}
h1{font-size:clamp(44px,7.2vw,92px);line-height:.92}
h2{font-size:clamp(30px,4.2vw,52px);line-height:1;max-width:22ch}
h3{font-size:21px;line-height:1.1}
p{margin:0}
.label{font-family:var(--f-mono);font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--accent);margin:0 0 14px;display:flex;align-items:center;gap:10px}
.label::before{content:"";width:22px;height:2px;background:currentColor}
.label.light{color:var(--accent)}
.prose{display:grid;gap:16px;color:var(--muted);max-width:62ch}
.prose-p{color:var(--muted);max-width:62ch;margin-top:18px}
.prose-p.light{color:var(--night-muted)}
.fine{font-size:12.5px;color:var(--muted);line-height:1.5}
.fine a{color:inherit}
sup a{color:var(--accent);text-decoration:none;font-weight:600}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:600 14px/1 var(--f-body);text-decoration:none;border-radius:4px;padding:11px 16px;border:1px solid transparent;cursor:pointer;white-space:nowrap;transition:transform .15s ease,background-color .15s ease,border-color .15s ease}
.btn.lg{padding:15px 22px;font-size:15px}
.btn.primary{background:var(--accent);color:var(--accent-ink)}
.btn.primary:hover{transform:translateY(-1px);filter:brightness(1.05)}
.btn.outline-light{border-color:rgba(228,236,233,.35);color:var(--night-ink)}
.btn.outline-light:hover{border-color:var(--night-ink)}
.btn.ghost-dark{color:var(--night-ink)}
.btn.ghost-dark:hover{text-decoration:underline}

/* top bar */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:color-mix(in srgb,var(--night) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--night-line);color:var(--night-ink)}
.top-in{display:flex;align-items:center;gap:24px;padding-block:12px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit}
.brand b{display:block;font-family:var(--f-display);font-size:24px;letter-spacing:.03em;text-transform:uppercase;line-height:1}
.brand small{display:block;font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;opacity:.7}
.mark{width:22px;height:22px;background:var(--accent);border:2px solid var(--night-ink);transform:rotate(45deg);flex:none;margin:0 4px}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{color:var(--night-muted);text-decoration:none;font-size:14px;font-weight:500;padding:8px 10px;border-radius:4px}
.nav a:hover{color:var(--night-ink)}
.top-cta{display:flex;gap:6px}
@media (max-width:980px){.nav{display:none}.top-cta{margin-left:auto}}
@media (max-width:420px){.top-cta .ghost-dark{display:none}}

/* hero */
.hero{background:radial-gradient(1200px 600px at 75% 30%,#1B2A27 0%,var(--night) 60%);color:var(--night-ink);padding-block:56px 40px;overflow:hidden}
.hero-in{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:40px;align-items:center}
@media (max-width:900px){.hero-in{grid-template-columns:minmax(0,1fr)}}
.eyebrow{font-family:var(--f-mono);font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--night-muted);margin-bottom:18px}
.deva{font-family:var(--f-deva);font-size:18px;text-transform:none;letter-spacing:0;color:var(--accent);margin-right:4px}
.hero h1{color:var(--night-ink)}
.hero .lede{color:var(--night-muted);font-size:17.5px;max-width:56ch;margin-top:22px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero .fine{color:var(--night-muted);margin-top:14px}
.hero-map{margin:0;min-width:0}
.hero-map canvas{display:block;width:100%;height:auto;max-width:560px;margin-inline:auto}
.hero-map figcaption{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 16px;font-size:12px;color:var(--night-muted);margin-top:6px}
.sw{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:6px;vertical-align:-1px}
.sw.gas{background:#5EA6E6}.sw.flam{background:#F07650}.sw.toxic{background:#A884E0}.sw.corr{background:#45BFB1}
.note{font-style:italic}
.facts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:var(--night-line);border:1px solid var(--night-line);border-radius:6px;overflow:hidden;margin:44px 0 0}
.facts div{background:var(--night-2);padding:18px 20px}
.facts dt{font-family:var(--f-display);font-weight:700;font-size:40px;line-height:1;color:var(--accent);font-variant-numeric:tabular-nums}
.facts dd{margin:8px 0 0;font-size:13.5px;color:var(--night-muted);line-height:1.45}
@media (max-width:820px){.facts{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* bands */
.band{padding-block:88px}
.band.alt{background:var(--soft)}
.band.dark{background:var(--night);color:var(--night-ink)}
.band.dark h2{color:var(--night-ink)}
@media (max-width:700px){.band{padding-block:64px}}
.two{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:48px;align-items:start}
@media (max-width:860px){.two{grid-template-columns:minmax(0,1fr);gap:24px}}

/* steps (a real sequence, so numbered) */
.steps{list-style:none;margin:40px 0 0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;counter-reset:s;border-top:2px solid var(--ink)}
.steps li{padding:22px 22px 0 0;position:relative;min-width:0}
.steps li + li{padding-left:22px;border-left:1px solid var(--line)}
.step-n{font-family:var(--f-mono);font-weight:600;font-size:13px;color:var(--accent);display:block;margin-bottom:10px}
.steps h3{margin-bottom:10px}
.steps p{color:var(--muted);font-size:15px}
@media (max-width:900px){.steps{grid-template-columns:repeat(2,minmax(0,1fr))}.steps li:nth-child(3){padding-left:0;border-left:0}.steps li{padding-bottom:22px}}
@media (max-width:520px){.steps{grid-template-columns:minmax(0,1fr)}.steps li + li{padding-left:0;border-left:0;border-top:1px solid var(--line)}}

/* ADR placard */
.placard{display:inline-grid;grid-template-rows:1fr 1fr;width:76px;height:54px;background:#E87511;border:2.5px solid #111;border-radius:3px;font-family:var(--f-mono);font-weight:600;color:#111;text-align:center;font-size:17px;line-height:1;flex:none}
.placard span{display:flex;align-items:center;justify-content:center}
.placard span:first-child{border-bottom:2.5px solid #111}

/* gate demo */
.gate{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:48px;align-items:start}
@media (max-width:900px){.gate{grid-template-columns:minmax(0,1fr)}}
.gate-form{display:grid;gap:14px;margin:26px 0 12px;max-width:440px}
.gate-form label{display:grid;gap:6px;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.gate-form select{font:inherit;font-size:15px;text-transform:none;letter-spacing:0;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:4px;padding:10px 12px;width:100%}
.gate-form .btn{justify-self:start}
.gate-card{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:22px;box-shadow:0 18px 40px -24px rgba(0,0,0,.35);min-width:0}
.gate-head{display:flex;gap:14px;align-items:center;padding-bottom:16px;border-bottom:1px solid var(--line)}
.gate-title{font-weight:600;font-size:17px}
.gate-sub{color:var(--muted);font-size:13.5px}
.checks{list-style:none;margin:8px 0 0;padding:0;display:grid}
.checks li{display:grid;grid-template-columns:26px minmax(0,1fr) auto;gap:10px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.checks li:last-child{border-bottom:0}
.checks .ic{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:700;background:var(--soft);color:var(--muted)}
.checks .val{font-family:var(--f-mono);font-size:12.5px;color:var(--muted);text-align:right}
.checks li.pass .ic{background:color-mix(in srgb,var(--ok) 18%,transparent);color:var(--ok)}
.checks li.fail .ic{background:color-mix(in srgb,var(--crit) 18%,transparent);color:var(--crit)}
.checks li.fail .val{color:var(--crit)}
.checks li.wait{opacity:.55}
.verdict{margin-top:14px;padding:12px 14px;border-radius:6px;font-weight:600;font-size:15px}
.verdict.ok{background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--ok)}
.verdict.bad{background:color-mix(in srgb,var(--crit) 12%,transparent);color:var(--crit)}

/* products */
.plates{list-style:none;margin:40px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.plates li{display:flex;gap:14px;align-items:center;background:var(--night-2);border:1px solid var(--night-line);border-radius:6px;padding:14px;min-width:0}
.plates .pname{font-weight:600;color:var(--night-ink)}
.plates .pmeta{font-size:12.5px;color:var(--night-muted)}
.plates .cls{display:inline-block;width:8px;height:8px;border-radius:2px;margin-right:6px}

/* value */
.value-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:40px}
@media (max-width:900px){.value-grid{grid-template-columns:minmax(0,1fr)}}
.value{border-top:3px solid var(--accent);padding-top:18px}
.value ul{margin:14px 0 0;padding-left:18px;display:grid;gap:8px;color:var(--muted);font-size:15px}
.calc{margin-top:56px;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:26px}
.calc-head{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;margin-bottom:22px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:6px;padding:3px;background:var(--bg)}
.seg button{font:600 13.5px var(--f-body);border:0;background:transparent;color:var(--muted);padding:8px 14px;border-radius:4px;cursor:pointer}
.seg button[aria-selected="true"]{background:var(--ink);color:var(--bg)}
.calc-body{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:32px;align-items:center}
@media (max-width:760px){.calc-body{grid-template-columns:minmax(0,1fr)}}
.sliders{display:grid;gap:18px}
.sliders label{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px 12px;font-size:14px;font-weight:500}
.sliders output{font-family:var(--f-mono);font-weight:600;font-variant-numeric:tabular-nums;color:var(--ink)}
.sliders input{grid-column:1/-1;width:100%;accent-color:var(--accent)}
.result{display:grid;gap:6px;background:var(--soft);border-radius:8px;padding:22px}
.r-label{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:600}
.r-big{font-family:var(--f-display);font-weight:700;font-size:clamp(40px,5vw,58px);line-height:1;color:var(--accent);font-variant-numeric:tabular-nums}
.r-sub{font-size:14px;color:var(--muted)}
.calc-note{margin-top:16px}

/* tower */
.tower{align-items:center}
.ticks{list-style:none;margin:20px 0 0;padding:0;display:grid;gap:10px}
.ticks li{padding-left:26px;position:relative;font-size:15px}
.ticks li::before{content:"";position:absolute;left:4px;top:.55em;width:10px;height:10px;transform:rotate(45deg);background:var(--accent)}
.tower-mock{background:var(--night);border-radius:8px;padding:18px;display:grid;gap:10px;color:var(--night-ink);box-shadow:0 24px 48px -28px rgba(0,0,0,.5);min-width:0}
.tm-row{display:grid;grid-template-columns:4px auto minmax(0,1fr);gap:12px;font-size:14px;line-height:1.45;padding:10px 0;border-bottom:1px solid var(--night-line)}
.tm-row::before{content:"";border-radius:2px;background:#E2A94C}
.tm-row.tm-crit::before{background:#EC6B5E}
.tm-row.tm-ok::before{background:#3DBA7B}
.tm-time{font-family:var(--f-mono);font-size:12px;color:var(--night-muted)}
.tower-mock .fine{color:var(--night-muted)}

/* security */
.sec-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:8px;overflow:hidden;margin-top:40px}
.sec-grid > div{background:var(--surface);padding:24px}
.sec-grid p{color:var(--muted);font-size:15px;margin-top:10px}
@media (max-width:900px){.sec-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:560px){.sec-grid{grid-template-columns:minmax(0,1fr)}}

/* roadmap */
.road{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:40px}
@media (max-width:860px){.road{grid-template-columns:minmax(0,1fr)}}
.road-col{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:22px}
.road-col.now{border-color:var(--ok)}
.road-col ul{margin:14px 0 0;padding-left:18px;display:grid;gap:8px;font-size:15px;color:var(--muted)}
.pill{display:inline-block;font:600 11.5px var(--f-body);letter-spacing:.08em;text-transform:uppercase;padding:3px 10px;border-radius:99px;border:1px solid var(--muted);color:var(--muted)}
.pill.ok{border-color:var(--ok);color:var(--ok)}

/* cta + footer */
.cta-band{padding-block:72px}
.cta-in{display:flex;flex-wrap:wrap;gap:24px 48px;align-items:center;justify-content:space-between}
.foot{background:var(--bg);border-top:1px solid var(--line);padding-block:40px}
.foot-in{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr) auto;gap:28px;align-items:start}
@media (max-width:820px){.foot-in{grid-template-columns:minmax(0,1fr)}}
.foot .brand{color:var(--ink)}
.foot .mark{border-color:var(--ink)}
.foot .fine{margin-top:10px}
.sources .fine{margin-top:0;margin-bottom:6px}
.foot-nav{display:flex;gap:16px;flex-wrap:wrap}
.foot-nav a{color:var(--muted);font-size:14px}

@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}