/* ============================================
   NeiBorBot.ai — Cyberpunk-minimal dark theme
   Palette: Obsidian black, neon lime, slate gray
   ============================================ */

:root {
  --obsidian: #0a0b0d;
  --obsidian-2: #0f1114;
  --obsidian-3: #14171c;
  --slate: #6b7280;
  --slate-light: #9ca3af;
  --slate-muted: #4b5563;
  --lime: #b8ff3c;
  --lime-dim: #8fcc2e;
  --lime-glow: rgba(184, 255, 60, 0.4);
  --lime-subtle: rgba(184, 255, 60, 0.12);
  --white: #f4f5f6;
  --font-heading: 'Orbitron', sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --glass-bg: rgba(15, 17, 20, 0.6);
  --glass-border: rgba(184, 255, 60, 0.15);
  --radius: 12px;
  --radius-lg: 20px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--slate-light);
  background: var(--obsidian);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Noise overlay */
.noise-overlay {
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1000;
}

/* Grid background */
.grid-bg {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(184, 255, 60, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(184, 255, 60, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 1.5rem;
  background: rgba(10, 11, 13, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
}

.logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--lime-subtle);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  color: var(--lime);
}

.logo-dot {
  color: var(--lime);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav a {
  color: var(--slate-light);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--lime);
}

.nav-cta {
  color: var(--lime) !important;
  padding: 0.5rem 1rem;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
}

.nav-cta:hover {
  background: var(--lime-subtle);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--slate-light);
}

/* Glass card */
.card {
  position: relative;
  padding: 2rem 2.25rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  overflow: hidden;
}

.card-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 0%, var(--lime-subtle) 0%, transparent 45%);
  pointer-events: none;
}

.card.glass:hover {
  border-color: rgba(184, 255, 60, 0.25);
  box-shadow: 0 0 40px var(--lime-glow);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.75rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.25s;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: var(--lime);
  color: var(--obsidian);
  border: 1px solid var(--lime);
}

.btn-primary:hover {
  background: var(--lime-dim);
  box-shadow: 0 0 30px var(--lime-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--lime);
  border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
  background: var(--lime-subtle);
  border-color: var(--lime);
  box-shadow: 0 0 20px var(--lime-glow);
}

.btn-icon {
  font-size: 0.75rem;
}

/* Container */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Section base */
.section {
  position: relative;
  z-index: 1;
  padding: 5rem 0;
}

.section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--white);
  margin: 0 0 1.25rem;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.section-title.centered {
  text-align: center;
}

.section-title .accent {
  color: var(--lime);
}

.section-body {
  margin: 0;
  font-size: 1.05rem;
  color: var(--slate-light);
  max-width: 60ch;
}

.section-body.centered {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  max-width: 55ch;
}

.section-intro {
  margin: 0 0 2.5rem;
  color: var(--slate-light);
  max-width: 52ch;
}

.section-intro.centered {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

strong.accent {
  color: var(--lime);
  font-weight: 600;
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  padding: 7rem 1.5rem 4rem;
  max-width: 1280px;
  margin: 0 auto;
}

.hero-schematic {
  position: absolute;
  width: 280px;
  height: 280px;
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  opacity: 0.4;
  pointer-events: none;
}

.hero-schematic::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, transparent 40%, var(--lime) 50%, transparent 60%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.5;
}

.hero-schematic-left {
  top: 15%;
  left: -5%;
}

.hero-schematic-right {
  bottom: 20%;
  right: -5%;
}

.hero-content {
  flex: 1 1 480px;
}

.hero-label {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
  margin: 0 0 1rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  color: var(--white);
  margin: 0 0 1.25rem;
  letter-spacing: 0.02em;
  line-height: 1.15;
}

.hero-title-accent {
  color: var(--lime);
  text-shadow: 0 0 40px var(--lime-glow);
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--slate-light);
  margin: 0 0 2rem;
  max-width: 42ch;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-visual {
  flex: 1 1 380px;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 320px;
}

.robot-placeholder {
  position: relative;
  max-width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.robot-placeholder::before {
  content: '';
  position: absolute;
  inset: -12px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  animation: pulse-ring 4s ease-in-out infinite;
  pointer-events: none;
}

.robot-placeholder::after {
  content: '';
  position: absolute;
  inset: -20px;
  border: 1px dashed rgba(184, 255, 60, 0.1);
  border-radius: calc(var(--radius-lg) + 8px);
  pointer-events: none;
}

@keyframes pulse-ring {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.01); }
}

.hero-cbot-image {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 560px;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  box-shadow: 0 0 40px var(--lime-glow), 0 24px 48px rgba(0, 0, 0, 0.4);
  object-fit: cover;
}

/* Section 2: Problem */
.section-problem .card {
  max-width: 720px;
  margin: 0 auto;
}

/* Section 3: EcoMind */
.section-ecomind {
  background: linear-gradient(180deg, transparent 0%, rgba(184, 255, 60, 0.02) 50%, transparent 100%);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.feature-card {
  padding: 2rem;
}

.feature-card h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--white);
  margin: 0 0 0.75rem;
  letter-spacing: 0.02em;
}

.feature-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--slate-light);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1.25rem;
  border: 1px solid var(--glass-border);
  border-radius: 10px;
}

.schematic-cnn {
  background: 
    linear-gradient(90deg, var(--lime) 1px, transparent 1px),
    linear-gradient(var(--lime) 1px, transparent 1px);
  background-size: 8px 8px;
  background-position: -1px -1px;
  opacity: 0.6;
}

.schematic-edge {
  background: 
    radial-gradient(circle at 50% 50%, var(--lime) 2px, transparent 2px),
    transparent;
  background-size: 16px 16px;
  opacity: 0.7;
}

.schematic-learning {
  background: 
    linear-gradient(135deg, transparent 45%, var(--lime) 50%, transparent 55%),
    linear-gradient(225deg, transparent 45%, var(--lime) 50%, transparent 55%);
  background-size: 24px 24px;
  opacity: 0.6;
}

/* Section 4: Hardware */
.tech-breakdown {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.tech-card {
  padding: 2rem;
}

.tech-card h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--white);
  margin: 0 0 0.75rem;
  letter-spacing: 0.02em;
}

.tech-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--slate-light);
}

.tech-schematic {
  width: 100%;
  height: 80px;
  margin-bottom: 1.25rem;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  opacity: 0.7;
}

.lidar-schematic {
  background:
    radial-gradient(circle at 50% 50%, transparent 0%, transparent 25%, var(--lime-subtle) 25%, transparent 26%),
    radial-gradient(circle at 50% 50%, transparent 0%, transparent 50%, rgba(184, 255, 60, 0.06) 50%, transparent 51%),
    radial-gradient(circle at 50% 50%, transparent 0%, transparent 75%, rgba(184, 255, 60, 0.04) 75%, transparent 76%),
    conic-gradient(from 0deg at 50% 50%, transparent 0deg 72deg, var(--lime-subtle) 72deg 90deg, transparent 90deg);
}

.sensor-schematic {
  background: 
    linear-gradient(90deg, transparent 0%, var(--lime) 20%, transparent 40%, var(--lime) 60%, transparent 80%, var(--lime) 100%);
  background-size: 100% 4px;
  background-position: 0 50%;
  opacity: 0.5;
}

.ev-schematic {
  background: 
    linear-gradient(90deg, var(--lime-subtle) 0%, transparent 30%, var(--lime-subtle) 50%, transparent 70%, var(--lime-subtle) 100%);
  background-size: 40% 100%;
}

/* Section 5: Beyond */
.missions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.mission-card {
  padding: 2rem;
}

.mission-card h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--white);
  margin: 0 0 0.5rem;
  letter-spacing: 0.02em;
}

.mission-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--slate-light);
}

/* Footer */
.footer {
  position: relative;
  z-index: 1;
  padding: 5rem 0 3rem;
  border-top: 1px solid var(--glass-border);
  background: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.3) 100%);
}

.footer-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--white);
  margin: 0 0 0.5rem;
  text-align: center;
  letter-spacing: 0.02em;
}

.footer-tagline {
  font-size: 1.1rem;
  color: var(--lime);
  text-align: center;
  margin: 0 0 2.5rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem 2rem;
  margin-bottom: 2.5rem;
}

.footer-nav a {
  color: var(--slate-light);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--lime);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--glass-border);
}

.footer-bottom .logo-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--white);
}

.copyright {
  margin: 0.5rem 0 0;
  font-size: 0.85rem;
  color: var(--slate-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .nav.is-open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 1rem;
    background: var(--obsidian-2);
    border-bottom: 1px solid var(--glass-border);
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    flex-direction: column;
    padding-top: 5rem;
    text-align: center;
  }

  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-ctas {
    justify-content: center;
  }

  .hero-schematic-left,
  .hero-schematic-right {
    display: none;
  }

  .section {
    padding: 3.5rem 0;
  }
}