:root {
  --bg-deep: #050510;
  --bg-mesh: radial-gradient(circle at 15% 10%, rgba(56, 189, 248, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 90%, rgba(139, 92, 246, 0.12) 0%, transparent 40%);

  --text-primary: #f8fafc;
  --text-muted: #94a3b8;

  --color-accent: #38bdf8;
  --color-accent-glow: rgba(56, 189, 248, 0.4);
  --color-primary-dark: #0ea5e9;

  --glass-panel: rgba(30, 41, 59, 0.4);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-blur: blur(16px);

  --radius-sm: 8px;
  --radius-lg: 24px;

  --max-width: 1024px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Outfit", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--bg-deep);
  background-image: var(--bg-mesh);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  color: var(--text-primary);
  line-height: 1.25;
  margin-top: 0;
}

p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #7dd3fc;
  text-shadow: 0 0 8px var(--color-accent-glow);
}

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

/* Hero Section */
.hero {
  text-align: center;
  padding: 8rem 0 6rem;
  position: relative;
  overflow: hidden;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #fff 20%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1.5rem;
  text-shadow: 0 0 40px rgba(56, 189, 248, 0.15);
}

.hero p {
  font-size: 1.25rem;
  max-width: 680px;
  margin: 0 auto 2.5rem;
  color: var(--text-muted);
}

/* Sections */
section {
  padding: 5rem 0;
}

.bg-alt {
  position: relative;
}

.bg-alt::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0%, transparent 100%);
  z-index: -1;
}

/* Capabilities (Cards) */
section#capabilities ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  padding: 0;
  list-style: none;
}

section#capabilities li {
  background: var(--glass-panel);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  padding: 2rem;
  border-radius: var(--radius-lg);
  transition: transform 0.2s, border-color 0.2s;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

section#capabilities li:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.15);
}

section#capabilities strong {
  display: block;
  font-size: 1.1rem;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

/* Accordions */
.accordion-group {
  display: grid;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.accordion {
  background: var(--glass-panel);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.2s;
}

.accordion[open] {
  border-color: rgba(56, 189, 248, 0.3);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.1);
}

.accordion summary {
  padding: 1.5rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.02);
}

.accordion summary:hover {
  background: rgba(255, 255, 255, 0.04);
}

.accordion summary::-webkit-details-marker {
  display: none;
}

.accordion-title {
  font-size: 1.1rem;
}

.accordion-chevron {
  opacity: 0.5;
  transition: transform 0.2s;
}

.accordion[open] .accordion-chevron {
  transform: rotate(180deg);
  color: var(--color-accent);
  opacity: 1;
}

.accordion-body {
  padding: 1.5rem;
  border-top: 1px solid var(--glass-border);
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.2);
}

.accordion-body code {
  background: rgba(0, 0, 0, 0.3);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-family: "JetBrains Mono", monospace;
  color: #e2e8f0;
  font-size: 0.9em;
}

/* Footer */
footer {
  margin-top: 4rem;
  padding: 3rem 0;
  border-top: 1px solid var(--glass-border);
  background: rgba(0, 0, 0, 0.4);
  color: var(--text-muted);
}

footer .container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
  text-align: center;
}

footer nav {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

footer a {
  color: var(--text-muted);
  font-size: 0.95rem;
}

footer a:hover {
  color: var(--text-primary);
}

/* Safety List */
#safety ul {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 1rem;
}

#safety li {
  padding-left: 1.5rem;
  position: relative;
}

#safety li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

@media (max-width: 640px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .container {
    padding: 0 1.5rem;
  }
}