/* Engine Pulse website: dark avionics-glass look, shared by every page except the upload portal and the demo. */
:root {
  --ink: #050b16;
  --glass: #0b1628;
  --panel: #111f36;
  --panel-2: #172a47;
  --line: #223a5e;
  --text: #e7eefb;
  --soft: #c3d1e8;
  --muted: #8ea3c4;
  --cyan: #5fd4ff;
  --green: #3ddc84;
  --yellow: #f7c948;
  --orange: #ff9f43;
  --red: #ff5a5f;
  --display: "Barlow Condensed", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --radius: 18px;
  color-scheme: dark;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; background: var(--ink); color: var(--text); font-family: var(--body); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img, svg { max-width: 100%; }
a { color: var(--cyan); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }
.wrap { max-width: 1160px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.narrow { max-width: 780px; }
.skip { position: absolute; left: -9999px; top: 8px; background: var(--cyan); color: #04121f; padding: 8px 14px; border-radius: 8px; z-index: 20; }
.skip:focus { left: 12px; }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.eyebrow { font-family: var(--display); text-transform: uppercase; letter-spacing: .14em; font-weight: 600; font-size: 14px; color: var(--cyan); }
h1, h2, h3 { font-family: var(--display); text-transform: uppercase; letter-spacing: .02em; line-height: 1; margin: 0; text-wrap: balance; }
h2 { font-size: clamp(32px, 4.4vw, 48px); font-weight: 800; }
h3 { font-size: 22px; font-weight: 700; letter-spacing: .03em; }
p { margin: 0; }
.lede { color: var(--soft); font-size: 18px; max-width: 60ch; }

/* Top bar */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--ink) 86%, transparent); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; gap: 18px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-family: var(--display); font-weight: 800; font-size: 22px; letter-spacing: .05em; text-transform: uppercase; white-space: nowrap; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.brand b { color: var(--cyan); font-weight: 800; }
.menu { display: flex; gap: 4px; margin-left: auto; align-items: center; }
.menu a { color: var(--soft); text-decoration: none; font-size: 15px; padding: 8px 10px; border-radius: 10px; white-space: nowrap; }
.menu a:hover, .menu a[aria-current="page"] { color: var(--text); background: var(--panel); }
.menu a.btn-primary, .menu a.btn-primary:hover { color: #04121f; background: var(--cyan); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: 600 16px/1 var(--body); padding: 13px 20px; border-radius: 999px; text-decoration: none; border: 1px solid transparent; cursor: pointer; white-space: nowrap; }
.btn-primary { background: var(--cyan); color: #04121f; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { border-color: var(--line); color: var(--text); background: transparent; }
.btn-ghost:hover { background: var(--panel); }
.btn-sm { padding: 9px 15px; font-size: 14px; }
.menu-toggle { display: none; margin-left: auto; background: var(--panel); color: var(--text); border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; font: 600 14px var(--body); }

/* Sections */
section { padding-block: 72px; }
.section-head { display: flex; flex-direction: column; gap: 14px; margin-bottom: 36px; }
.divider { border-top: 1px solid var(--line); }

/* Hero */
.hero { padding-block: 56px 48px; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 48px; align-items: center; }
.hero h1 { font-size: clamp(46px, 7vw, 86px); font-weight: 800; line-height: .92; }
.hero h1 em { font-style: normal; color: var(--cyan); }
.hero .hero-copy { display: flex; flex-direction: column; gap: 22px; }
.ctas { display: flex; gap: 12px; flex-wrap: wrap; }
.badges { display: flex; gap: 8px; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
.badges span { border: 1px solid var(--line); border-radius: 999px; padding: 4px 11px; }

.glass { background: linear-gradient(150deg, #0a1d3b, #13315e); border-radius: 24px; border: 1px solid #1d3a66; box-shadow: 0 40px 90px -40px rgba(95, 212, 255, .35); position: relative; overflow: hidden; }
.hero-card { padding: 24px; display: grid; gap: 18px; }
.hero-card .row { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.hero-card .tail { font-family: var(--display); font-weight: 800; font-size: 46px; line-height: .9; letter-spacing: .02em; }
.blur-tail { filter: blur(9px); user-select: none; -webkit-user-select: none; width: fit-content; }
.hero-card .sub { color: #b9c9e4; font-size: 14px; }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px; font-weight: 600; font-size: 14px; }
.gauge { position: relative; width: 132px; height: 132px; flex: none; }
.gauge .val { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.gauge b { font-family: var(--display); font-size: 46px; font-weight: 800; line-height: 1; }
.gauge span { font-family: var(--display); font-size: 12px; letter-spacing: .2em; font-weight: 700; color: var(--green); }
.pulse { width: 100%; height: 70px; display: block; }
.pulse path { stroke-dasharray: 900; stroke-dashoffset: 900; animation: trace 3.2s linear infinite; }
@keyframes trace { to { stroke-dashoffset: -900; } }
.mini { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.mini > div { background: rgba(5, 11, 22, .45); border-radius: 12px; padding: 10px 12px; }
.mini .k { font-size: 12px; color: #9fb4d6; }
.mini .v { font-family: var(--mono); font-weight: 600; font-size: 17px; }
.ew { background: rgba(5, 11, 22, .45); border-radius: 12px; padding: 10px 12px; display: grid; grid-template-columns: minmax(0, 1fr) 90px auto; gap: 10px; align-items: center; font-size: 14px; }
.ew small { display: block; color: #9fb4d6; font-size: 12px; }
.lvl { font-family: var(--display); font-weight: 700; letter-spacing: .06em; font-size: 12px; padding: 2px 9px; border-radius: 999px; white-space: nowrap; }
.caption { font-size: 12px; color: var(--muted); text-align: center; margin-top: 10px; }

/* Advisory strip */
.advisory { background: var(--glass); border-block: 1px solid var(--line); }
.advisory .wrap { display: flex; gap: 14px; align-items: flex-start; padding-block: 18px; color: var(--soft); font-size: 15px; }
.advisory svg { flex: none; color: var(--yellow); margin-top: 2px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; counter-reset: step; }
.step { background: var(--glass); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; display: flex; flex-direction: column; gap: 10px; }
.step::before { counter-increment: step; content: "0" counter(step); font-family: var(--mono); color: var(--cyan); font-size: 14px; }
.step p { color: var(--soft); font-size: 15px; }

/* Feature grid */
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.feature { background: var(--glass); padding: 26px; display: flex; flex-direction: column; gap: 10px; }
.feature .ic { width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center; background: rgba(95, 212, 255, .12); color: var(--cyan); }
.feature .ic svg { width: 20px; height: 20px; }
.feature p, .feature li { color: var(--soft); font-size: 15px; }
.feature ul { margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 4px; }

/* Health score explainer */
.score-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
.card { background: var(--glass); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; display: flex; flex-direction: column; gap: 14px; }
.card p { color: var(--soft); }
.bands { display: flex; flex-direction: column; gap: 8px; }
.band { display: grid; grid-template-columns: 82px minmax(0, 1fr); gap: 12px; align-items: center; padding: 10px 12px; border-radius: 12px; background: var(--panel); }
.band b { font-family: var(--mono); }
.costs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.cost { background: var(--panel); border-radius: 12px; padding: 12px; }
.cost .v { font-family: var(--display); font-size: 30px; font-weight: 800; line-height: 1; }
.cost .k { font-size: 13px; color: var(--muted); }

/* Avionics */
.avionics { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border-radius: 999px; padding: 6px 13px; font-size: 14px; background: var(--panel); border: 1px solid var(--line); }
.chip.live { border-color: rgba(61, 220, 132, .45); color: var(--green); }
.status { display: inline-flex; align-items: center; gap: 8px; font-family: var(--display); font-weight: 700; letter-spacing: .1em; text-transform: uppercase; font-size: 14px; }
.dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }

/* Data in */
.ways { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.way .tag { align-self: flex-start; }
.tag { font-family: var(--display); font-weight: 700; letter-spacing: .08em; font-size: 12px; padding: 3px 10px; border-radius: 999px; text-transform: uppercase; }
.tag.live { color: var(--green); background: rgba(61, 220, 132, .14); }
.tag.planned { color: var(--yellow); background: rgba(247, 201, 72, .14); }
.way ul { margin: 0; padding-left: 18px; color: var(--soft); font-size: 15px; display: flex; flex-direction: column; gap: 6px; }

/* Pricing */
.pricing { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px; align-items: center; }
.price-card { background: linear-gradient(160deg, #0d2140, #102a52); border: 1px solid #1d3a66; border-radius: 24px; padding: 30px; display: flex; flex-direction: column; gap: 18px; }
.price { display: flex; align-items: baseline; gap: 8px; }
.price b { font-family: var(--display); font-size: 72px; font-weight: 800; line-height: .9; }
.price span { color: var(--soft); }
.ticks { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.ticks li { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 8px; color: var(--soft); }
.ticks li::before { content: "✓"; color: var(--green); font-weight: 700; }
.fine { font-size: 13px; color: var(--muted); }

/* Demo band */
.demo-band { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 32px; align-items: center; background: var(--glass); border: 1px solid var(--line); border-radius: 24px; padding: 36px; }
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border-radius: 14px; overflow: hidden; border: 1px solid var(--line); }
.stats > div { background: var(--panel); padding: 14px; }
.stats .v { font-family: var(--display); font-size: 34px; font-weight: 800; line-height: 1; }
.stats .k { font-size: 13px; color: var(--muted); }

/* FAQ */
.faq { display: flex; flex-direction: column; gap: 10px; }
.faq details { background: var(--glass); border: 1px solid var(--line); border-radius: 14px; padding: 0 20px; }
.faq summary { cursor: pointer; list-style: none; padding: 18px 0; font-weight: 600; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--mono); color: var(--cyan); font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details > div { padding-bottom: 18px; color: var(--soft); display: flex; flex-direction: column; gap: 10px; }

/* Beta */
.beta { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 32px; align-items: center; }
.contact { background: var(--panel); border-radius: var(--radius); padding: 24px; display: flex; flex-direction: column; gap: 14px; }
.addr { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.addr code { font-family: var(--mono); background: var(--panel-2); padding: 10px 13px; border-radius: 10px; font-size: 15px; user-select: all; overflow-wrap: anywhere; }
.copy { background: transparent; color: var(--text); border: 1px solid var(--line); border-radius: 10px; padding: 9px 13px; font: 500 14px var(--body); cursor: pointer; }
.contact ol { margin: 0; padding-left: 20px; color: var(--soft); display: flex; flex-direction: column; gap: 4px; }

/* Footer */
footer.site { border-top: 1px solid var(--line); padding-block: 40px 48px; color: var(--muted); font-size: 14px; }
footer.site .wrap { display: grid; grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 1fr)); gap: 28px; }
footer.site h4 { margin: 0 0 10px; font-family: var(--display); text-transform: uppercase; letter-spacing: .12em; font-size: 13px; color: var(--text); }
footer.site ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
footer.site a { color: var(--soft); text-decoration: none; }
footer.site li { overflow-wrap: anywhere; }
footer.site a:hover { color: var(--text); text-decoration: underline; }
footer.site p { max-width: 52ch; }

/* Document pages (Privacy, Terms, Support) */
.doc-head { padding-block: 56px 28px; border-bottom: 1px solid var(--line); }
.doc-head h1 { font-size: clamp(42px, 6vw, 68px); font-weight: 800; margin-top: 12px; }
.doc-head p { margin-top: 14px; }
.doc { padding-block: 40px 72px; display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 48px; align-items: start; }
.toc { position: sticky; top: 88px; display: flex; flex-direction: column; gap: 2px; font-size: 14px; }
.toc b { font-family: var(--display); text-transform: uppercase; letter-spacing: .12em; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.toc a { color: var(--soft); text-decoration: none; padding: 5px 10px; border-left: 2px solid var(--line); }
.toc a:hover { color: var(--text); border-left-color: var(--cyan); }
.prose { max-width: 72ch; }
.prose h2 { font-size: 30px; margin: 44px 0 14px; scroll-margin-top: 84px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 21px; margin: 26px 0 10px; text-transform: none; letter-spacing: .01em; }
.prose p, .prose li { color: var(--soft); }
.prose p + p { margin-top: 12px; }
.prose ul, .prose ol { padding-left: 22px; margin: 12px 0; display: flex; flex-direction: column; gap: 6px; }
.prose strong { color: var(--text); }
.prose table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 15px; }
.prose th, .prose td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); color: var(--soft); }
.prose th { color: var(--text); font-weight: 600; background: var(--panel); }
.table-scroll { overflow-x: auto; }
.callout { background: var(--panel); border: 1px solid var(--line); border-left: 3px solid var(--yellow); border-radius: 12px; padding: 16px 18px; margin: 16px 0; }
.callout p { color: var(--text); }
.help-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-bottom: 8px; }
.help-grid a { background: var(--glass); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; text-decoration: none; color: var(--text); font-weight: 600; font-size: 15px; }
.help-grid a:hover { border-color: var(--cyan); }
.help-grid small { display: block; color: var(--muted); font-weight: 400; font-size: 13px; }

/* Responsive */
@media (max-width: 1000px) {
  .hero, .pricing, .beta, .demo-band, .score-grid, .avionics { grid-template-columns: minmax(0, 1fr); }
  .features, .ways { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .doc { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .toc { position: static; flex-direction: row; flex-wrap: wrap; gap: 6px; }
  .toc b { width: 100%; }
  .toc a { border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; }
}
@media (max-width: 860px) {
  .menu-toggle { display: inline-block; }
  .menu { display: none; position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; align-items: stretch; background: var(--ink); border-bottom: 1px solid var(--line); padding: 10px 16px 16px; gap: 2px; }
  .menu.open { display: flex; }
  .menu a { padding: 12px 10px; }
  .menu .btn { margin-top: 8px; }
}
@media (max-width: 640px) {
  section { padding-block: 52px; }
  .steps, .features, .ways, .help-grid { grid-template-columns: minmax(0, 1fr); }
  .hero { padding-block: 32px 36px; gap: 32px; }
  .hero-card { padding: 18px; }
  .hero-card .tail { font-size: 38px; }
  .gauge { width: 108px; height: 108px; }
  .gauge b { font-size: 38px; }
  .mini { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .mini .v { font-size: 15px; }
  .ew { grid-template-columns: minmax(0, 1fr) auto; }
  .ew svg { display: none; }
  .demo-band, .price-card { padding: 22px; }
  .stats .v { font-size: 28px; }
  footer.site .wrap { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  footer.site .wrap > div:first-child { grid-column: 1 / -1; }
  .ctas .btn { flex: 1 1 auto; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .pulse path { animation: none; stroke-dasharray: none; stroke-dashoffset: 0; }
}

/* Sign-up page */
.signup { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 48px; align-items: start; padding-block: 56px 72px; }
.signup-intro { display: flex; flex-direction: column; gap: 20px; position: sticky; top: 96px; }
.signup-intro h1 { font-size: clamp(40px, 5.4vw, 64px); font-weight: 800; line-height: .95; }
.signup-steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; counter-reset: s; }
.signup-steps li { display: grid; grid-template-columns: 34px minmax(0, 1fr); column-gap: 12px; background: var(--glass); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; }
.signup-steps li::before { counter-increment: s; content: counter(s); grid-row: span 2; width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; background: rgba(95, 212, 255, .14); color: var(--cyan); font-family: var(--mono); font-weight: 600; font-size: 14px; }
.signup-steps b { font-weight: 600; }
.signup-steps span { color: var(--muted); font-size: 14px; }
.form-card { background: var(--glass); border: 1px solid var(--line); border-radius: 24px; padding: 28px; }
.form-card form, .form-card section { display: flex; flex-direction: column; gap: 16px; }
.form-card p { color: var(--soft); }
.form-title { font-size: 26px; }
.field { display: flex; flex-direction: column; gap: 6px; border: 0; margin: 0; padding: 0; min-width: 0; }
.field-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; }
.field label, .field legend { font-weight: 600; font-size: 15px; padding: 0; }
.hint { color: var(--muted); font-weight: 400; font-size: 13px; }
.form-card input[type=text], .form-card input[type=email], .form-card input[type=password], .form-card select {
  width: 100%; min-width: 0; font: 16px var(--body); color: var(--text); background: var(--ink); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.form-card select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 20px) 50%, calc(100% - 14px) 50%; background-size: 6px 6px; background-repeat: no-repeat; padding-right: 36px; }
.form-card input:focus, .form-card select:focus { outline: 2px solid var(--cyan); outline-offset: 1px; border-color: transparent; }
.code-input { font-family: var(--mono) !important; font-size: 28px !important; letter-spacing: .4em; text-align: center; }
.checks { display: flex; gap: 18px; flex-wrap: wrap; }
.check { display: inline-flex; align-items: flex-start; gap: 10px; font-weight: 400 !important; color: var(--soft); cursor: pointer; }
.check input { width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--cyan); flex: none; }
.consent span { font-size: 14px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .6; cursor: progress; }
.form-msg { min-height: 1.2em; font-size: 14px; margin: 0; }
.form-msg.err { color: var(--red); }
.form-msg.ok { color: var(--green); }
.row-links { display: flex; gap: 18px; flex-wrap: wrap; }
.link-btn { background: none; border: 0; padding: 0; color: var(--cyan); font: 500 15px var(--body); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.next { margin: 0; padding-left: 22px; color: var(--soft); display: flex; flex-direction: column; gap: 6px; }
@media (max-width: 1000px) { .signup { grid-template-columns: minmax(0, 1fr); gap: 28px; } .signup-intro { position: static; } }
@media (max-width: 640px) { .signup { padding-block: 32px 52px; } .form-card { padding: 20px; } .field-row { grid-template-columns: minmax(0, 1fr); } }