/* NERA ROBOTICS — modern B2B marketing page */
:root {
  --bg: #0b1220;
  --bg-elevated: #121a2b;
  --bg-card: #151f33;
  --bg-card-hover: #1a2740;
  --border: rgba(148, 163, 184, 0.14);
  --text: #e8eef8;
  --text-muted: #9aa8c0;
  --accent: #2dd4bf;
  --accent-strong: #14b8a6;
  --accent-soft: rgba(45, 212, 191, 0.12);
  --accent-glow: rgba(45, 212, 191, 0.35);
  --navy: #0f172a;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  --header-h: 72px;
  --font: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: #5eead4;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #042f2e;
  padding: 0.75rem 1rem;
  z-index: 1000;
  font-weight: 600;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(11, 18, 32, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.logo:hover {
  color: var(--text);
  opacity: 0.95;
}

.logo-img {
  display: block;
  height: 40px;
  width: auto;
  border-radius: 6px;
  object-fit: contain;
  background: #000;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.logo-text strong {
  font-weight: 700;
  color: #fff;
}

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

.hero-brand {
  margin: 0 0 0.35rem;
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  background: #000;
  border: 1px solid rgba(148, 163, 184, 0.12);
  box-shadow: inset 0 0 40px rgba(45, 212, 191, 0.06);
}

.hero-brand img {
  width: 100%;
  height: auto;
  max-width: 380px;
  margin: 0 auto;
  border-radius: 4px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav a:not(.btn) {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.site-nav a:not(.btn):hover {
  color: var(--text);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elevated);
  padding: 10px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
  cursor: pointer;
  text-align: center;
}

.btn:active {
  transform: translateY(1px);
}

.btn-sm {
  padding: 0.55rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1rem 1.6rem;
  font-size: 1.05rem;
}

.btn-accent {
  background: var(--accent);
  color: #042f2e;
}

.btn-accent:hover {
  background: #5eead4;
  color: #042f2e;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* Hero */
.hero {
  position: relative;
  padding: clamp(3rem, 8vw, 6rem) 0 clamp(4rem, 9vw, 7rem);
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  inset: -20% auto auto 40%;
  width: min(70vw, 640px);
  height: min(70vw, 640px);
  background:
    radial-gradient(circle at 30% 40%, rgba(45, 212, 191, 0.22), transparent 55%),
    radial-gradient(circle at 70% 60%, rgba(56, 189, 248, 0.14), transparent 50%);
  pointer-events: none;
  filter: blur(8px);
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.35fr 0.85fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0 0 1.5rem;
  font-size: clamp(2.4rem, 5.5vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: #fff;
}

.hero-questions {
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.hero-questions li {
  position: relative;
  padding-left: 1.15rem;
  color: var(--text-muted);
  font-size: 1.02rem;
}

.hero-questions li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.hero-solve {
  margin: 0 0 0.75rem;
  font-size: clamp(1.25rem, 2.5vw, 1.55rem);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.01em;
}

.hero-tagline {
  margin: 0 0 1.75rem;
  color: var(--text-muted);
  max-width: 36rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-panel {
  position: relative;
  display: grid;
  gap: 0.85rem;
  padding: 1.25rem;
  border-radius: calc(var(--radius) + 4px);
  background: linear-gradient(160deg, rgba(21, 31, 51, 0.95), rgba(15, 23, 42, 0.9));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.panel-accent {
  position: absolute;
  inset: auto -1px -1px auto;
  width: 120px;
  height: 120px;
  background: linear-gradient(135deg, transparent 40%, rgba(45, 212, 191, 0.18));
  border-radius: 0 0 var(--radius) 0;
  pointer-events: none;
}

.stat-card {
  padding: 1rem 1.1rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
}

.stat-num {
  display: block;
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}

.stat-label {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Sections */
.section {
  padding: clamp(3.5rem, 8vw, 5.5rem) 0;
}

.section-alt {
  background: var(--bg-elevated);
  border-block: 1px solid var(--border);
}

.section-head {
  max-width: 40rem;
  margin-bottom: 2.5rem;
}

.section h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: #fff;
}

.section-lead {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* Service cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}

.card {
  position: relative;
  padding: 1.5rem 1.4rem 1.6rem;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(45, 212, 191, 0.35);
  transform: translateY(-2px);
}

.card-num {
  display: block;
  margin-bottom: 0.85rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.card h3 {
  margin: 0 0 0.65rem;
  font-size: 1.15rem;
  line-height: 1.3;
  color: #fff;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: start;
}

.about-grid > div > p {
  color: var(--text-muted);
}

.about-questions {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.about-questions li {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  border: 1px solid rgba(45, 212, 191, 0.22);
  color: var(--text);
}

.about-aside {
  display: grid;
  gap: 0.9rem;
}

.aside-block {
  padding: 1.2rem 1.25rem;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.aside-block h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  color: var(--accent);
}

.aside-block p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Advantages */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}

.adv-card {
  padding: 1.75rem 1.5rem;
  border-radius: var(--radius);
  background:
    linear-gradient(165deg, rgba(45, 212, 191, 0.08), transparent 55%),
    var(--bg-card);
  border: 1px solid var(--border);
}

.adv-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 1rem;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.15rem;
  font-weight: 700;
}

.adv-card h3 {
  margin: 0 0 0.5rem;
  color: #fff;
  font-size: 1.2rem;
}

.adv-card p {
  margin: 0;
  color: var(--text-muted);
}

/* CTA / Contact */
.cta-band {
  background:
    radial-gradient(ellipse at 20% 0%, rgba(45, 212, 191, 0.12), transparent 50%),
    var(--navy);
  border-top: 1px solid var(--border);
}

.cta-inner {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 2rem;
  align-items: center;
}

.contact-list {
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
}

.contact-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.contact-list a,
.contact-list span:last-child {
  color: var(--text);
  font-weight: 500;
}

.contact-list a:hover {
  color: var(--accent);
}

.cta-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Footer */
.site-footer {
  padding: 1.75rem 0;
  border-top: 1px solid var(--border);
  background: #070b14;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.footer-logo:hover {
  color: #fff;
  opacity: 0.92;
}

.footer-logo img {
  display: block;
  height: 40px;
  width: auto;
  border-radius: 6px;
  object-fit: contain;
  background: #000;
}

.footer-logo strong {
  font-weight: 700;
}

.footer-brand {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
}

.footer-copy {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-top {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-top:hover {
  color: var(--accent);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid,
  .about-grid,
  .cta-inner {
    grid-template-columns: 1fr;
  }

  .card-grid,
  .adv-grid {
    grid-template-columns: 1fr 1fr;
  }

  .cta-actions {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .hero-panel {
    order: -1;
    max-width: 28rem;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.75rem 1rem 1.25rem;
    background: rgba(11, 18, 32, 0.97);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(14px);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 0.85rem 0.5rem;
    border-bottom: 1px solid var(--border);
  }

  .site-nav a.btn {
    margin-top: 0.75rem;
    border-bottom: none;
    justify-content: center;
  }

  .card-grid,
  .adv-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .card,
  .btn,
  .nav-toggle span {
    transition: none;
  }
}