:root {
  --bg: #0a0a0a;
  --fg: #ffffff;
  --accent: #00d1b2;
  --accent-rgb: 0, 209, 178;
  --muted: #888888;
  --card-bg: #141414;
  --border: rgba(255, 255, 255, 0.1);
  --glass: rgba(255, 255, 255, 0.03);
  --container: 1200px;
  --font-main: 'Space Grotesk', sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-main);
  line-height: 1.6;
  overflow-x: hidden;
}

.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: 
    radial-gradient(circle at 0% 0%, rgba(var(--accent-rgb), 0.08) 0%, transparent 50%),
    radial-gradient(circle at 100% 100%, rgba(var(--accent-rgb), 0.05) 0%, transparent 50%);
  opacity: 0.8;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 2rem;
}

/* Navbar */
.navbar {
  height: 80px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.8);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-shell {
  display: flex;
  align-items: center;
  gap: 1rem;
}

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

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

nav a.nav-cta {
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.5rem 1rem;
  border-radius: 4px;
}

.auth-menu {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.auth-menu-link,
.auth-menu-button {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.auth-menu-link:hover,
.auth-menu-button:hover {
  color: var(--fg);
}

.auth-menu-pill {
  color: var(--accent);
  border: 1px solid rgba(var(--accent-rgb), 0.55);
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
}

.auth-menu-button {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.5rem 0.85rem;
  cursor: pointer;
  font: inherit;
}

/* Hero */
.hero {
  padding: 8rem 0 6rem;
  position: relative;
}

.badge {
  display: inline-block;
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

h1 {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  line-height: 1.1;
  font-weight: 700;
  margin: 0 0 1.5rem;
  letter-spacing: -0.03em;
  max-width: 900px;
}

.lead {
  font-size: 1.25rem;
  color: var(--muted);
  max-width: 650px;
  margin-bottom: 2.5rem;
}

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

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.875rem 1.75rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  cursor: pointer;
  text-align: center;
}

.btn.primary {
  background: var(--accent);
  color: #000;
}

.btn.primary:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

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

.btn.secondary:hover {
  background: var(--border);
  transform: translateY(-2px);
}

.btn.outline {
  border: 1px solid var(--border);
  color: var(--fg);
}

.btn.outline:hover {
  background: var(--glass);
  border-color: var(--muted);
}

/* Sections */
.section {
  padding: 6rem 0;
}

.section.alt {
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-header {
  margin-bottom: 4rem;
}

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

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
}

.subhead {
  color: var(--muted);
  font-size: 1.125rem;
  margin-top: 0.5rem;
}

/* Platforms */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.platform-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 2.5rem;
  border-radius: 8px;
  transition: transform 0.3s, border-color 0.3s;
}

.platform-card:hover {
  border-color: rgba(var(--accent-rgb), 0.3);
  transform: translateY(-5px);
}

.platform-icon {
  width: 48px;
  height: 48px;
  background: var(--glass);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  border-radius: 4px;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

.platform-card h3 {
  font-size: 1.5rem;
  margin: 0 0 1rem;
}

.platform-card p {
  color: var(--muted);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.platform-links a {
  color: var(--fg);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}

.tag {
  font-size: 0.7rem;
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.pricing-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 3rem 2rem;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(var(--accent-rgb), 0.05) 0%, transparent 100%), var(--card-bg);
}

.featured-badge {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--accent);
  color: #000;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  text-transform: uppercase;
}

.tier-header {
  margin-bottom: 2rem;
  text-align: center;
}

.tier-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--muted);
  display: block;
  margin-bottom: 0.5rem;
}

.tier-price {
  font-size: 3rem;
  font-weight: 700;
}

.tier-price span {
  font-size: 1rem;
  color: var(--muted);
}

.tier-features {
  list-style: none;
  padding: 0;
  margin: 0 0 3rem;
  flex-grow: 1;
}

.tier-features li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}

.tier-features li strong {
  color: var(--fg);
}

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

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

/* Principles */
.principles-wrap {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
  align-items: center;
}

.principle-item {
  margin-top: 2.5rem;
}

.principle-item h4 {
  font-size: 1.125rem;
  margin: 0 0 0.5rem;
}

.principle-item p {
  color: var(--muted);
  margin: 0;
}

.principles-visual {
  background: var(--glass);
  border: 1px solid var(--border);
  height: 400px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.visual-box {
  width: 200px;
  height: 200px;
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  transform: rotate(45deg);
  display: flex;
  flex-direction: column;
  justify-content: space-evenly;
}

.visual-line {
  height: 1px;
  background: rgba(var(--accent-rgb), 0.1);
  width: 100%;
}

/* Contact */
.contact-card {
  background: var(--accent);
  color: #000;
  padding: 4rem;
  border-radius: 8px;
  text-align: center;
}

.contact-card h2 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.contact-card p {
  font-size: 1.25rem;
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  opacity: 0.8;
}

.contact-card .btn.primary {
  background: #000;
  color: #fff;
  font-size: 1.1rem;
}

/* Footer */
.main-footer {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-brand {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: var(--fg);
}

.copyright {
  color: var(--muted);
  font-size: 0.875rem;
  width: 100%;
  margin-top: 2rem;
}

@media (max-width: 900px) {
  .principles-wrap {
    grid-template-columns: 1fr;
  }
  .principles-visual {
    height: 300px;
  }
}

@media (max-width: 768px) {
  .hero { padding: 4rem 0; }
  .navbar nav { display: none; }
  .nav-shell {
    width: 100%;
    justify-content: space-between;
  }
  .auth-menu-link,
  .auth-menu-button {
    font-size: 0.82rem;
  }
  .hero-actions { flex-direction: column; }
  .contact-card { padding: 2.5rem 1.5rem; }
  .contact-card h2 { font-size: 2rem; }
}