/* Bluarc Labs: site styles */

:root {
  --navy: #0A1F44;
  --navy-2: #13295A;
  --blue: #1565D8;
  --blue-hover: #0F52B5;
  --blue-mid: #4A90E2;
  --blue-soft: #C9DAF2;
  --ice: #EEF4FC;
  --white: #FFFFFF;
  --text: #3A4A63;
  --text-muted: #6B7A93;
  --line: #DCE5F2;

  --font-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --container: 1200px;
  --gutter: 24px;
  --header-h: 72px;
  --radius: 4px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--white);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }

h1, h2, h3 {
  color: var(--navy);
  margin: 0;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

p { margin: 0; }

a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-hover); }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 2px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  left: 16px; top: -48px;
  z-index: 100;
  background: var(--navy);
  color: var(--white);
  padding: 10px 16px;
  border-radius: var(--radius);
  transition: top .2s;
}
.skip-link:focus { top: 12px; color: var(--white); }

/* Eyebrow labels */
.eyebrow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 18px;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--blue);
}
.eyebrow-sep { color: var(--blue-mid); }

.lead {
  font-size: 19px;
  line-height: 1.6;
  color: var(--text);
  font-weight: 400;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 500;
  line-height: 1;
  padding: 16px 26px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
  white-space: nowrap;
}
.btn-primary { background: var(--blue); color: var(--white); }
.btn-primary:hover { background: var(--blue-hover); color: var(--white); }
.btn-primary:active { transform: translateY(1px); }
.btn-sm { padding: 11px 18px; font-size: 15px; }
.btn-link { color: var(--navy); padding-left: 4px; padding-right: 4px; }
.btn-link span { transition: transform .2s var(--ease); }
.btn-link:hover { color: var(--blue); }
.btn-link:hover span { transform: translateX(4px); }

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(255, 255, 255, .92);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, box-shadow .25s;
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 6px 24px -18px rgba(10, 31, 68, .35);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--navy);
}
.wordmark:hover { color: var(--navy); }
.wordmark-mark { width: 30px; height: 30px; flex: none; }
.wordmark-text {
  font-size: 17px;
  letter-spacing: .16em;
  font-weight: 400;
  white-space: nowrap;
}
.wordmark-text strong { font-weight: 700; }
.wordmark-light, .wordmark-light:hover { color: var(--white); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 36px;
}
.site-nav a:not(.btn) {
  color: var(--navy);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}
.site-nav a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s var(--ease);
}
.site-nav a:not(.btn):hover { color: var(--blue); }
.site-nav a:not(.btn):hover::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  margin-right: -10px;
  background: none;
  border: 0;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.nav-toggle-bar {
  width: 22px; height: 2px;
  background: var(--navy);
  transition: transform .25s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }

/* Hero */
.hero {
  position: relative;
  padding: calc(var(--header-h) + 72px) 0 0;
  background:
    linear-gradient(180deg, rgba(255,255,255,0) 60%, var(--white) 100%),
    linear-gradient(var(--ice) 1px, transparent 1px) 0 0 / 40px 40px,
    linear-gradient(90deg, var(--ice) 1px, transparent 1px) 0 0 / 40px 40px,
    var(--white);
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  align-items: center;
  gap: 48px;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin-bottom: 26px;
}
.hero h1 span {
  display: block;
  color: var(--blue);
  font-weight: 400;
}

.hero .lead { max-width: 560px; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
  margin-top: 36px;
}

.hero-visual { position: relative; }
.schematic { width: 100%; height: auto; }

/* schematic parts */
.sx-fill { fill: var(--white); }
.sx-stroke { stroke: var(--navy); stroke-width: 1.5; }
.sx-stroke-accent { stroke: var(--blue); stroke-width: 2; }
.sx-stroke-line { stroke: var(--navy); stroke-width: 1.5; fill: none; }
.sx-hair { stroke: var(--blue-soft); stroke-width: 1; }
.sx-grid { stroke: var(--ice); stroke-width: 1; }
.sx-dot { fill: var(--blue); }
.sx-dot-soft { fill: var(--blue-soft); }
.sx-bar { fill: var(--blue); }
.sx-bar-soft { fill: var(--blue-soft); }
.sx-level { fill: var(--ice); stroke: var(--blue-mid); stroke-width: 1; }
.sx-node { fill: var(--white); stroke: var(--blue); stroke-width: 2; }
.sx-sensor { fill: var(--blue); }
.sx-wave {
  fill: none;
  stroke: var(--blue);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.sx-arc { fill: none; stroke: var(--blue-mid); stroke-width: 2; stroke-linecap: round; }
.sx-trace { fill: none; stroke: var(--blue-soft); stroke-width: 2; }
.sx-flow {
  fill: none;
  stroke: var(--blue);
  stroke-width: 2;
  stroke-dasharray: 6 14;
}
.sx-check { fill: none; stroke: var(--blue); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }

.hero-strip {
  list-style: none;
  margin: 72px 0 0;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--navy);
}
.hero-strip li { display: flex; align-items: center; gap: 12px; }
.strip-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--blue);
  letter-spacing: .08em;
}

/* Sections */
.section { padding: 112px 0; }
.section-tint { background: var(--ice); }

.section-head { max-width: 680px; margin-bottom: 56px; }
.section h2 {
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 600;
}

/* Focus cards */
.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px 32px 40px;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), transform .25s var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  left: -1px; right: -1px; top: -1px;
  height: 3px;
  background: var(--blue);
  transform: scaleX(.18);
  transform-origin: left;
  transition: transform .35s var(--ease);
}
.card:hover {
  border-color: var(--blue-soft);
  box-shadow: 0 18px 40px -28px rgba(10, 31, 68, .45);
  transform: translateY(-3px);
}
.card:hover::before { transform: scaleX(1); }

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 32px;
}
.card-icon {
  width: 48px; height: 48px;
  fill: none;
  stroke: var(--navy);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.card-icon .ic-accent { stroke: var(--blue); stroke-width: 2; }
.card-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: .08em;
}
.card h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 12px;
}
.card p { color: var(--text); }

/* SAFE */
.safe-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  align-items: center;
  gap: 64px;
}
.safe-copy h2 { margin-bottom: 28px; max-width: 560px; }

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 0 rgba(21, 101, 216, .5);
  animation: pulse 2.4s infinite;
}

.checklist {
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  display: grid;
  gap: 16px;
}
.checklist li {
  position: relative;
  padding-left: 36px;
  font-size: 18px;
  color: var(--navy);
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 0; top: 4px;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 22 22'%3E%3Cpath d='M6.5 11.5l3 3 6-6.5' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 22px no-repeat;
}

.safe-visual svg { width: 100%; max-width: 440px; margin: 0 auto; }
.sv-shield { fill: var(--white); stroke: var(--blue); stroke-width: 2; }
.sv-shield-inner { fill: none; stroke: var(--blue-soft); stroke-width: 1.5; stroke-dasharray: 4 6; }
.sv-pc rect { fill: var(--ice); stroke: var(--navy); stroke-width: 1.5; }
.sv-pc path { fill: none; stroke: var(--navy); stroke-width: 1.5; stroke-linecap: round; }
.sv-bus { fill: none; stroke: var(--blue-mid); stroke-width: 1.5; }
.sv-node { fill: var(--blue); }
.sv-plc { fill: var(--navy); }

/* About */
.about-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 80px;
  align-items: start;
}
.about-copy h2 { margin-bottom: 24px; }

.principles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.principles li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 8px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}
.principle-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--blue);
  letter-spacing: .08em;
  padding-top: 4px;
}
.principles h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 6px;
}

/* Contact */
.contact {
  background: var(--ice);
  border-top: 1px solid var(--line);
}
.contact-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.contact-inner h2 { margin-bottom: 28px; }
.contact-email {
  font-size: clamp(24px, 4vw, 44px);
  font-weight: 500;
  color: var(--blue);
  letter-spacing: -0.01em;
  border-bottom: 2px solid var(--blue-soft);
  padding-bottom: 4px;
  overflow-wrap: anywhere;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.contact-email:hover { color: var(--navy); border-bottom-color: var(--navy); }

/* Footer */
.site-footer {
  background: var(--navy);
  color: #B9C6DB;
  font-size: 15px;
}
.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  padding-top: 64px;
  padding-bottom: 48px;
}
.footer-tag { margin-top: 16px; color: #B9C6DB; }
.footer-nav { display: flex; flex-direction: column; gap: 12px; }
.site-footer a:not(.wordmark) { color: #DCE5F2; }
.site-footer a:not(.wordmark):hover { color: var(--white); }
.footer-contact { justify-self: end; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .12);
  padding-top: 24px;
  padding-bottom: 32px;
  font-size: 14px;
  color: #8EA0BE;
}

/* Motion: only when JS is active and the user allows it */
@media (prefers-reduced-motion: no-preference) {
  .js .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .7s var(--ease), transform .7s var(--ease);
  }
  .js .reveal.is-visible { opacity: 1; transform: none; }
  .cards .reveal:nth-child(2), .principles .reveal:nth-child(2) { transition-delay: .08s; }
  .cards .reveal:nth-child(3), .principles .reveal:nth-child(3) { transition-delay: .16s; }

  .sx-flow { animation: flow 2.8s linear infinite; }
  .sx-flow-2 { animation-duration: 3.6s; }
  .sx-arc { animation: ping 2.4s var(--ease) infinite; }
  .sx-arc-2 { animation-delay: .3s; }
  .sx-arc-3 { animation-delay: .6s; }
  .sx-wave {
    stroke-dasharray: 520;
    stroke-dashoffset: 520;
    animation: draw 2.2s var(--ease) .3s forwards;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .status-dot { animation: none; }
}

@keyframes flow { to { stroke-dashoffset: -200; } }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes ping {
  0%, 100% { opacity: .25; }
  40% { opacity: 1; }
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(21, 101, 216, .45); }
  70% { box-shadow: 0 0 0 8px rgba(21, 101, 216, 0); }
  100% { box-shadow: 0 0 0 0 rgba(21, 101, 216, 0); }
}

/* Responsive */
@media (max-width: 1024px) {
  .section { padding: 88px 0; }
  .hero-inner { gap: 32px; }
  .cards { grid-template-columns: minmax(0, 1fr); max-width: 680px; }
  .about-inner { gap: 48px; }
  .safe-inner { gap: 40px; }
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--gutter) 24px;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 32px -24px rgba(10, 31, 68, .4);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
  }
  .site-nav.is-open { visibility: visible; opacity: 1; transform: none; }
  .site-nav a:not(.btn) {
    padding: 16px 0;
    font-size: 17px;
    border-bottom: 1px solid var(--line);
  }
  .site-nav a:not(.btn)::after { display: none; }
  .site-nav .btn { margin-top: 20px; justify-content: center; padding: 16px; font-size: 16px; }

  .hero { padding-top: calc(var(--header-h) + 48px); }
  .hero-inner { grid-template-columns: minmax(0, 1fr); }
  .hero-visual { max-width: 520px; }
  .hero-strip { grid-template-columns: minmax(0, 1fr); gap: 12px; margin-top: 48px; }

  .safe-inner, .about-inner { grid-template-columns: minmax(0, 1fr); }
  .safe-visual { order: -1; }
  .safe-visual svg { max-width: 340px; margin: 0; }

  .footer-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { justify-self: start; }
}

@media (max-width: 560px) {
  :root { --gutter: 16px; --header-h: 64px; }
  body { font-size: 16px; }
  .lead { font-size: 17px; }
  .section { padding: 72px 0; }
  .section-head { margin-bottom: 40px; }
  .hero h1 { font-size: 34px; }
  .hero-actions .btn-primary { width: 100%; justify-content: center; }
  .card { padding: 28px 24px 32px; }
  .checklist li { font-size: 17px; }
  .wordmark-text { font-size: 15px; letter-spacing: .14em; }
  .wordmark-mark { width: 26px; height: 26px; }
  .footer-inner { grid-template-columns: minmax(0, 1fr); gap: 28px; padding-top: 48px; }
}