*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --carbon-black: #0A0A0A;
  --warm-white: #F5F5F0;
  --photonic-cyan: #00D4E8;
  --cyan-glow: #5BE5F0;
  --plasma-violet: #8B7FD8;
  --deep-indigo: #0F1B3D;
  --indigo-light: #1F2D55;
  --text-secondary: #8A95A8;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--carbon-black);
  color: var(--warm-white);
  line-height: 1.6;
  overflow-x: hidden;
}

/* NAV */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 1.5rem 2rem;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex; justify-content: space-between; align-items: center;
  border-bottom: 1px solid rgba(15, 27, 61, 0.4);
}
nav .logo-link { text-decoration: none; }
.logo-text {
  font-size: 1.1rem; font-weight: 300; letter-spacing: 0.35em;
  text-transform: uppercase; color: var(--warm-white);
}
.logo-text span { color: var(--photonic-cyan); }
nav a {
  color: var(--text-secondary); text-decoration: none;
  font-size: 0.85rem; font-weight: 400; letter-spacing: 0.1em;
  transition: color 0.3s;
}
nav a:hover, nav a.active { color: var(--photonic-cyan); }
.nav-links { display: flex; gap: 2rem; }

@media (max-width: 768px) {
  .nav-links { display: none; }
  nav { padding: 1rem 1.5rem; }
}

/* HERO */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center;
  padding: 8rem 2rem 4rem;
  position: relative;
  background: radial-gradient(ellipse at 50% 40%, rgba(15, 27, 61, 0.35) 0%, transparent 70%);
}
.hero::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(circle at 50% 45%, rgba(0, 212, 232, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.page-hero {
  min-height: 60vh;
  padding: 10rem 2rem 4rem;
}

/* Photon symbol */
.photon-symbol {
  width: 140px; height: 140px; margin-bottom: 3rem; position: relative;
}
.photon-symbol svg { width: 100%; height: 100%; }

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 200;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
h1 span { color: var(--photonic-cyan); }
.tagline {
  font-size: clamp(1rem, 2vw, 1.3rem);
  font-weight: 300;
  color: var(--text-secondary);
  letter-spacing: 0.15em;
  margin-bottom: 1.5rem;
}
.patent-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--cyan-glow);
  border: 1px solid rgba(0, 212, 232, 0.3);
  padding: 0.4rem 1.2rem;
  margin-bottom: 3rem;
  border-radius: 1px;
}
.hero-cta {
  display: inline-block;
  border: 1px solid var(--photonic-cyan);
  color: var(--photonic-cyan);
  padding: 0.8rem 2.5rem;
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
  transition: all 0.3s;
}
.hero-cta:hover {
  background: var(--photonic-cyan);
  color: var(--carbon-black);
}

/* SECTIONS */
section {
  padding: 6rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}
.section-label {
  font-size: 0.75rem; font-weight: 500; letter-spacing: 0.3em;
  text-transform: uppercase; color: var(--photonic-cyan);
  margin-bottom: 1rem;
}
h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 200;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
}
h3 {
  font-size: 1.1rem; font-weight: 400; letter-spacing: 0.05em;
  margin-bottom: 1rem; color: var(--warm-white);
}
.section-text {
  font-size: 1.05rem; font-weight: 300; color: var(--text-secondary);
  max-width: 700px; line-height: 1.8;
}
.section-text p + p { margin-top: 1.2rem; }

/* DIVIDER */
.divider {
  width: 60px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--photonic-cyan), transparent);
  margin: 0 auto;
}

/* TECH CARDS */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}
.tech-card {
  background: rgba(15, 27, 61, 0.18);
  border: 1px solid rgba(15, 27, 61, 0.4);
  border-radius: 2px;
  padding: 2.5rem 2rem;
  transition: border-color 0.3s, background 0.3s;
}
.tech-card:hover {
  border-color: rgba(0, 212, 232, 0.4);
  background: rgba(15, 27, 61, 0.28);
}
.tech-icon {
  width: 36px; height: 36px; margin-bottom: 1.5rem;
  color: var(--photonic-cyan);
}
.tech-card p {
  font-size: 0.95rem; font-weight: 300; color: var(--text-secondary);
  line-height: 1.7;
}

/* APPROACH LIST */
.approach-list {
  margin-top: 2.5rem;
  display: flex; flex-direction: column; gap: 1.5rem;
}
.approach-item {
  display: flex; align-items: flex-start; gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid rgba(15, 27, 61, 0.3);
}
.approach-num {
  font-size: 1.5rem; font-weight: 200; color: var(--photonic-cyan);
  min-width: 2rem;
}
.approach-item h3 {
  font-size: 1rem; margin-bottom: 0.4rem;
}
.approach-item p {
  font-size: 0.9rem; font-weight: 300; color: var(--text-secondary); line-height: 1.7;
}

/* CONTACT */
.contact-section {
  text-align: center;
  padding: 8rem 2rem;
}
.contact-details {
  margin-top: 2rem;
  font-weight: 300; color: var(--text-secondary);
}
.contact-details a {
  color: var(--photonic-cyan);
  text-decoration: none;
  transition: opacity 0.3s;
}
.contact-details a:hover { opacity: 0.8; }
.contact-row {
  margin: 0.8rem 0;
  font-size: 1rem;
}

/* FOOTER */
footer {
  text-align: center;
  padding: 3rem 2rem;
  font-size: 0.75rem;
  font-weight: 300;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  border-top: 1px solid rgba(15, 27, 61, 0.2);
}
footer .company-info {
  margin-top: 0.5rem;
  font-size: 0.7rem;
  color: rgba(138, 149, 168, 0.5);
  line-height: 1.8;
}
footer a {
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
footer a:hover { border-bottom-color: var(--photonic-cyan); }