/* ============================================
   QER.IO — Zero-Trust Industrial Edge
   Design tokens
   ============================================ */
:root {
  /* Color */
  --bg: #0E1416;
  --bg-raised: #141C1F;
  --bg-card: #161F22;
  --line: #26333666;
  --line-strong: #2E3D40;
  --text: #EDEAE2;
  --text-dim: #A8B0AC;
  --text-faint: #6E7A77;
  --accent: #D9A441;
  --accent-dim: #D9A44199;
  --accent-glow: #D9A44133;
  --cyan: #5B8A8C;
  --cyan-dim: #5B8A8C66;
  --danger: #C2614B;

  /* Type */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --container: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
p { margin: 0; }

/* subtle grain overlay for an industrial, non-flat surface */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--text);
}

h1 { font-size: clamp(2.4rem, 5vw, 3.7rem); line-height: 1.06; font-weight: 700; }
h2 { font-size: clamp(1.9rem, 3.4vw, 2.7rem); line-height: 1.14; }
h3 { font-size: 1.15rem; }

.mono { font-family: var(--font-mono); }

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--accent-dim);
  margin: 0 0 14px;
  text-transform: uppercase;
}

.section-lede {
  max-width: 620px;
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-top: 18px;
}

/* ============================================
   Layout helpers
   ============================================ */
.section { padding: 110px 0; border-top: 1px solid var(--line); }
.section-inner { max-width: var(--container); margin: 0 auto; padding: 0 32px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 13px 24px;
  border-radius: 3px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s ease;
}
.btn-primary {
  background: var(--accent);
  color: #16110A;
}
.btn-primary:hover { background: #E8B656; transform: translateY(-1px); }

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--text);
  background: transparent;
}
.btn-ghost:hover { border-color: var(--accent-dim); color: var(--accent); }

/* ============================================
   Nav
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #0E1416CC;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 9px; }
.brand-mark { color: var(--accent); display: flex; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}
.brand-dot { color: var(--text-faint); font-weight: 500; }

.nav-links {
  display: flex;
  gap: 30px;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  font-size: 0.88rem;
  color: var(--text-dim);
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--text); }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  border: 1px solid var(--line-strong);
  padding: 9px 16px;
  border-radius: 3px;
  white-space: nowrap;
  transition: all 0.15s ease;
}
.nav-cta:hover { border-color: var(--accent); color: var(--accent); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  width: 30px;
  height: 22px;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span { display: block; height: 1.5px; background: var(--text); width: 100%; }

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  padding: 90px 0 70px;
  overflow: hidden;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 80% 60% at 30% 30%, black, transparent 75%);
}
.hero-inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.03em;
  margin-bottom: 22px;
}
.eyebrow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.hero-accent { color: var(--accent); }

.hero-lede {
  margin-top: 22px;
  max-width: 520px;
  color: var(--text-dim);
  font-size: 1.08rem;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 36px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
}
.stat-label {
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.01em;
}

/* Hero topology visual */
.hero-visual { width: 100%; }
#topology { width: 100%; height: auto; overflow: visible; }

.node circle {
  fill: var(--bg-raised);
  stroke: var(--text-faint);
  stroke-width: 1.6;
}
.node text {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: var(--text-dim);
  text-anchor: middle;
  letter-spacing: 0.02em;
}
.node.gateway circle {
  stroke: var(--accent);
  stroke-width: 2;
  fill: var(--bg-card);
  filter: drop-shadow(0 0 8px var(--accent-glow));
}
.node.gateway text { fill: var(--accent); font-weight: 600; }
.node.mesh circle {
  stroke: var(--cyan);
  stroke-width: 2;
  fill: var(--bg-card);
}
.node.mesh text { fill: var(--cyan); font-weight: 600; }
.node.device circle { animation: node-blink 3.2s ease-in-out infinite; }
.node.device:nth-of-type(2) circle { animation-delay: 0.6s; }
.node.device:nth-of-type(3) circle { animation-delay: 1.2s; }
@keyframes node-blink {
  0%, 100% { stroke: var(--text-faint); }
  50% { stroke: var(--accent-dim); }
}

.link {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 1.4;
  stroke-dasharray: 4 5;
  animation: dash-flow 18s linear infinite;
}
.link.main-tunnel {
  stroke: var(--accent-dim);
  stroke-width: 2;
  stroke-dasharray: 3 4;
  animation: dash-flow 6s linear infinite;
}
@keyframes dash-flow {
  to { stroke-dashoffset: -200; }
}

.tunnel-label {
  font-family: var(--font-mono);
  font-size: 8.5px;
  fill: var(--accent-dim);
  letter-spacing: 0.04em;
  text-anchor: middle;
}

/* ============================================
   Problem section
   ============================================ */
.problem-grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.problem-card {
  background: var(--bg);
  padding: 32px 28px;
}
.problem-glyph {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  color: var(--accent-dim);
  margin-bottom: 18px;
}
.problem-card h3 { font-size: 1.02rem; margin-bottom: 10px; }
.problem-card p { color: var(--text-dim); font-size: 0.93rem; line-height: 1.55; }
.problem-card--result {
  background: var(--bg-raised);
}
.problem-card--result h3 { color: var(--danger); }

/* ============================================
   Solution / Zero Trust
   ============================================ */
.compare {
  margin-top: 48px;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}
.compare-row {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 26px 28px;
}
.compare-before { background: var(--bg-raised); border-bottom: 1px solid var(--line); }
.compare-after { background: var(--bg-card); }
.compare-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  width: 90px;
  flex-shrink: 0;
}
.compare-after .compare-label { color: var(--accent); }
.compare-chain {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.chip {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 8px 14px;
  border-radius: 3px;
  border: 1px solid var(--line-strong);
  color: var(--text-dim);
}
.chip-accent {
  border-color: var(--accent-dim);
  color: var(--accent);
  background: var(--accent-glow);
}
.arrow { color: var(--text-faint); font-size: 0.9rem; }
.arrow-accent { color: var(--accent-dim); }

.advantages {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.advantage {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.advantage-mark {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-dim);
}
.advantage p { font-size: 0.96rem; color: var(--text); }

/* ============================================
   Architecture
   ============================================ */
.arch-diagram {
  margin-top: 52px;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.arch-layer { display: flex; align-items: center; gap: 18px; }
.arch-kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-faint);
  width: 90px;
  flex-shrink: 0;
}
.arch-box {
  flex: 1;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--bg-raised);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.arch-box strong { font-family: var(--font-display); font-size: 1.05rem; }
.arch-proto { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-faint); }
.arch-box--accent {
  border-color: var(--accent-dim);
  background: linear-gradient(135deg, var(--accent-glow), var(--bg-raised) 60%);
}
.arch-box--small { padding: 16px 18px; }

.arch-connector {
  height: 38px;
  margin-left: 90px;
  padding-left: 24px;
  display: flex;
  align-items: center;
  position: relative;
}
.arch-connector span { display: none; }
.arch-connector::before {
  content: '';
  width: 1px;
  height: 100%;
  background: repeating-linear-gradient(to bottom, var(--line-strong) 0 4px, transparent 4px 8px);
  position: absolute;
  left: 24px;
}
.arch-connector--tunnel {
  height: 50px;
  padding-left: 0;
  justify-content: flex-start;
}
.arch-connector--tunnel::before {
  background: repeating-linear-gradient(to bottom, var(--accent-dim) 0 4px, transparent 4px 8px);
}
.arch-connector--tunnel span {
  display: block;
  margin-left: 44px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--accent-dim);
  letter-spacing: 0.02em;
}

.arch-cloud-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  flex: 1;
}
.arch-layer--cloud .arch-kicker { align-self: flex-start; margin-top: 4px; }

.stack {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}
.stack-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-bottom: 16px;
}
.stack-items { display: flex; gap: 10px; flex-wrap: wrap; }
.stack-item {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  padding: 9px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  color: var(--text-dim);
}

/* ============================================
   Modules
   ============================================ */
.module-grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.module-card {
  background: var(--bg);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.module-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.module-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: 4px 9px;
  border-radius: 3px;
  letter-spacing: 0.05em;
}
.module-tag--future {
  color: var(--cyan);
  border-color: var(--cyan-dim);
}
.module-card p { color: var(--text-dim); font-size: 0.95rem; }
.module-card ul { display: flex; flex-direction: column; gap: 8px; margin-top: 4px; }
.module-card li {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-faint);
  padding-left: 16px;
  position: relative;
}
.module-card li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--accent-dim);
}
.module-card--future { background: var(--bg-raised); }

/* ============================================
   Markets
   ============================================ */
.markets { padding: 64px 0; }
.markets-row {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.market-pill {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--text-dim);
}

/* ============================================
   Pricing
   ============================================ */
.pricing-grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.price-card {
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
}
.price-card h3 { font-size: 1rem; color: var(--text-dim); font-weight: 500; font-family: var(--font-body); }
.price-value {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text);
}
.price-value span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--text-faint);
  margin-left: 4px;
}
.price-desc { font-size: 0.87rem; color: var(--text-faint); line-height: 1.5; }
.price-card--featured {
  border-color: var(--accent-dim);
  background: linear-gradient(160deg, var(--accent-glow), transparent 60%);
}
.price-badge {
  position: absolute;
  top: -11px;
  left: 24px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  background: var(--accent);
  color: #16110A;
  padding: 3px 10px;
  border-radius: 3px;
  letter-spacing: 0.03em;
}

/* ============================================
   Roadmap
   ============================================ */
.timeline {
  margin-top: 52px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.timeline-item {
  border-top: 2px solid var(--line-strong);
  padding-top: 22px;
  position: relative;
}
.timeline-item--active { border-top-color: var(--accent); }
.timeline-marker {
  position: absolute;
  top: -13px;
  left: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
}
.timeline-item--active .timeline-marker {
  border-color: var(--accent);
  color: var(--accent);
}
.timeline-content { margin-top: 14px; }
.timeline-content h3 { margin-bottom: 14px; }
.timeline-content li {
  font-size: 0.9rem;
  color: var(--text-dim);
  padding-left: 14px;
  position: relative;
  margin-bottom: 8px;
}
.timeline-content li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-faint);
}

/* ============================================
   Contact
   ============================================ */
.contact { padding-bottom: 130px; }
.contact-inner { text-align: left; }
.contact-lede {
  margin-top: 20px;
  max-width: 480px;
  color: var(--text-dim);
  font-size: 1.02rem;
}
.contact-actions {
  display: flex;
  gap: 14px;
  margin-top: 36px;
  flex-wrap: wrap;
}

/* ============================================
   Footer
   ============================================ */
.footer { border-top: 1px solid var(--line); padding: 28px 0; }
.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
}

/* ============================================
   Focus states (a11y)
   ============================================ */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 980px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 8px 0;
  }
  .nav-links--open { display: flex; }
  .nav-links a {
    padding: 14px 24px;
    border-bottom: 1px solid var(--line);
  }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }

  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 380px; margin: 0 auto; }

  .problem-grid { grid-template-columns: 1fr 1fr; }
  .module-grid { grid-template-columns: 1fr; }
  .advantages { grid-template-columns: 1fr 1fr; }
  .pricing-grid { grid-template-columns: 1fr 1fr; }
  .timeline { grid-template-columns: 1fr; gap: 44px; }
  .arch-cloud-row { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .section { padding: 70px 0; }
  .section-inner { padding: 0 20px; }
  .nav-inner { padding: 0 20px; }
  .hero { padding: 50px 0 40px; }
  .hero-stats { flex-direction: column; gap: 20px; }
  .problem-grid { grid-template-columns: 1fr; }
  .advantages { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .compare-row { flex-direction: column; align-items: flex-start; gap: 12px; }
  .arch-kicker { width: 70px; font-size: 0.62rem; }
  .arch-connector { margin-left: 70px; }
  .arch-connector--tunnel span { margin-left: 24px; font-size: 0.68rem; }
}