/* Global styles */
:root {
  --color-bg-dark: #0b0c10;
  --color-bg-light: #f8fafc;
  --color-text-dark: #e5e7eb;
  --color-text-light: #111317;
  --color-muted-dark: #9aa5b6;
  --color-muted-light: #4b5563;
  --color-accent: #3d8bff;
  --color-secondary: #7b61ff;
  --radius: 12px;
  --max-width: 1200px;
}
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--color-bg-dark);
  color: var(--color-text-dark);
  line-height: 1.6;
  transition: background .3s, color .3s;
}
body.light {
  background: var(--color-bg-light);
  color: var(--color-text-light);
}
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}
header {
  background: rgba(0, 0, 0, .6);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}
body.light header {
  background: rgba(255, 255, 255, .85);
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}
.nav-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.nav-links a {
  color: inherit;
  text-decoration: none;
  padding-bottom: 4px;
  font-weight: 500;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
}
.theme-toggle {
  cursor: pointer;
  border: 1px solid var(--color-muted-dark);
  padding: 6px 10px;
  border-radius: 8px;
  background: transparent;
  font-size: 14px;
  color: inherit;
}
body.light .theme-toggle {
  border-color: var(--color-muted-light);
}
.button {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  margin-right: 10px;
  transition: background .3s;
}
.button.primary {
  background: var(--color-accent);
  color: #fff;
}
.button.secondary {
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  background: transparent;
}
.button.primary:hover {
  background: #2f6cd4;
}
.button.secondary:hover {
  background: var(--color-accent);
  color: #fff;
}
.hero {
  background: radial-gradient(circle at 20% 20%, rgba(61,139,255,.25), transparent),
              radial-gradient(circle at 80% 80%, rgba(123,97,255,.18), transparent);
  padding: 80px 0;
}
.hero .split {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(32px, 4vw, 54px);
  margin-bottom: 20px;
  line-height: 1.2;
}
.hero p {
  color: var(--color-muted-dark);
  max-width: 600px;
}
body.light .hero p {
  color: var(--color-muted-light);
}
.hero-visual {
  flex: 1;
  min-height: 300px;
  border-radius: var(--radius);
  background: linear-gradient(135deg,#0f1216,#0c0f13);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted-dark);
  border: 1px solid rgba(255,255,255,.08);
}
body.light .hero-visual {
  background: #e5e7eb;
}
.grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.card {
  background: rgba(255,255,255,.02);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  padding: 20px;
  flex: 1 1 calc(25% - 20px);
  display: flex;
  flex-direction: column;
  min-width: 250px;
}
body.light .card {
  background: #fff;
  border-color: #e5e7eb;
}
.card h3 {
  margin: 10px 0 6px;
  font-size: 18px;
}
.card p {
  flex: 1;
  color: var(--color-muted-dark);
  font-size: 14px;
}
body.light .card p {
  color: var(--color-muted-light);
}
.card .img {
  background: url('../assets/placeholder.png') center/cover no-repeat;
  border-radius: var(--radius);
  height: 160px;
}
.metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 30px;
}
.metric {
  flex: 1 1 calc(25% - 20px);
  min-width: 200px;
  background: rgba(255,255,255,.02);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
body.light .metric {
  background: #fff;
  border-color: #e5e7eb;
}
.metric .big {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
}
.metric .small {
  color: var(--color-muted-dark);
}
body.light .metric .small {
  color: var(--color-muted-light);
}
.steps {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.step {
  flex: 1 1 calc(33% - 20px);
  min-width: 220px;
  background: rgba(255,255,255,.02);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  padding: 20px;
}
body.light .step {
  background: #fff;
  border-color: #e5e7eb;
}
footer {
  margin-top: 60px;
  padding: 30px 0;
  border-top: 1px solid rgba(255,255,255,.1);
  color: var(--color-muted-dark);
  font-size: 14px;
}
body.light footer {
  border-color: #e5e7eb;
  color: var(--color-muted-light);
}
footer .links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
footer a {
  color: inherit;
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}
@media (max-width: 900px) {
  .card {
    flex: 1 1 calc(50% - 20px);
  }
  .metric, .step {
    flex: 1 1 calc(50% - 20px);
  }
  .hero .split {
    flex-direction: column;
  }
  .hero-visual {
    width: 100%;
  }
}
@media (max-width: 600px) {
  .card {
    flex: 1 1 100%;
  }
  .metric, .step {
    flex: 1 1 100%;
  }
  .nav-links {
    gap: 10px;
  }
}