:root {
  --orange: #F7931A;
  --orange-dim: rgba(247, 147, 26, 0.7);
  --dark: #1c1c1c;
  --darker: #1c1c1c;
  --grey: #888;
  --light: #e0e0e0;
  --white: #ffffff;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  background: var(--darker);
  color: var(--light);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--orange); }

/* Fixed triangulation background */
.bg-triangulation {
  position: fixed;
  top: 0;
  right: 0;
  width: 60vw;
  height: 100vh;
  background: url('../img/bg-triangulation.png') center right no-repeat;
  background-size: contain;
  opacity: 0.12;
  z-index: 0;
  pointer-events: none;
}

/* On the home page the CSS is in css/ but the bg is in img/, so use ../img */
.home .bg-triangulation {
  background-image: url('../img/bg-triangulation.png');
}

.content {
  position: relative;
  z-index: 1;
}

/* Top navigation */
.topnav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(28, 28, 28, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.9rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo img {
  height: 100px;
  display: block;
}

.nav-links {
  display: flex;
  gap: 1.4rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--grey);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--orange);
}

/* Hero (home) */
.hero {
  min-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem 3rem;
}

.hero-logo {
  max-width: 520px;
  width: 90%;
  margin-bottom: 2rem;
}

.hero-tagline {
  font-size: 1.5rem;
  color: var(--grey);
  max-width: 640px;
  margin-bottom: 1rem;
}

.hero-tagline em {
  color: var(--orange);
  font-style: normal;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--grey);
  max-width: 520px;
  margin-bottom: 2.5rem;
}

.hero-cta-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.hero-cta {
  display: inline-block;
  padding: 0.8rem 2rem;
  background: var(--orange);
  color: var(--dark);
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  border-radius: 4px;
  transition: opacity 0.2s;
}

.hero-cta:hover { opacity: 0.85; }

.hero-cta.secondary {
  background: transparent;
  color: var(--orange);
  border: 1px solid var(--orange);
}

/* Generic home sections */
section {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

h2 {
  font-size: 1.8rem;
  color: var(--white);
  margin-bottom: 1.5rem;
}

h2 .accent { color: var(--orange); }

.intro-text {
  font-size: 1.1rem;
  color: var(--light);
  max-width: 720px;
  margin-bottom: 2rem;
}

/* Stat grid */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.stat {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--grey);
  margin-top: 0.5rem;
}

/* Teaser cards on home */
.teasers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
}

.teaser {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: transform 0.15s, border-color 0.15s;
}

.teaser:hover {
  transform: translateY(-2px);
  border-color: rgba(247, 147, 26, 0.3);
}

.teaser h3 {
  color: var(--orange);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  margin-top: 0;
}

.teaser p {
  color: var(--grey);
  font-size: 0.9rem;
  margin: 0;
}

.teaser.featured {
  grid-column: 1 / -1;
  padding: 2rem;
  border-color: rgba(247, 147, 26, 0.3);
  background: rgba(247, 147, 26, 0.05);
}

.teaser.featured h3 {
  font-size: 1.4rem;
}

.teaser.featured p {
  font-size: 1rem;
  color: var(--light);
}

/* Article page layout */
.article {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
}

.article h1 {
  font-size: 2.5rem;
  color: var(--white);
  margin-bottom: 0.8rem;
  line-height: 1.2;
}

.article .subtitle {
  font-size: 1.1rem;
  color: var(--grey);
  font-style: italic;
  margin-bottom: 3rem;
}

.article h2 {
  font-size: 1.5rem;
  margin-top: 3rem;
  margin-bottom: 1rem;
  color: var(--white);
}

.article h2 .num {
  color: var(--orange);
  margin-right: 0.5rem;
}

.article h3 {
  font-size: 1.15rem;
  margin-top: 2rem;
  margin-bottom: 0.6rem;
  color: var(--white);
}

.article p {
  margin-bottom: 1.2rem;
  font-size: 1.03rem;
  line-height: 1.75;
  color: var(--light);
}

.article ul, .article ol {
  margin: 0 0 1.4rem 1.5rem;
}

.article li {
  margin-bottom: 0.4rem;
  line-height: 1.6;
}

.article strong { color: var(--white); }

.article blockquote {
  border-left: 3px solid var(--orange);
  padding: 0.4rem 0 0.4rem 1.5rem;
  margin: 2rem 0;
  color: var(--light);
  font-style: italic;
}

.article blockquote p { margin-bottom: 0.4rem; }

.article code {
  background: rgba(255,255,255,0.08);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  font-size: 0.88em;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.article pre {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1.2rem 0;
}

.article pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
}

.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.article th {
  text-align: left;
  padding: 0.6rem 1rem;
  background: rgba(255,255,255,0.04);
  color: var(--white);
  font-weight: 600;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.article td {
  padding: 0.6rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  vertical-align: top;
}

.article hr {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.08);
  margin: 3rem 0;
}

.article .callout {
  background: rgba(247, 147, 26, 0.06);
  border-left: 3px solid var(--orange);
  padding: 1.2rem 1.5rem;
  border-radius: 0 6px 6px 0;
  margin: 2rem 0;
}

.article .callout p:last-child { margin-bottom: 0; }

.article .footer-nav {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.9rem;
}

.article .footer-nav a { text-decoration: none; }

/* Triangulation section */
.triangulation-home {
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.06);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 3rem 2rem;
}

.tri-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin: 2rem auto;
  max-width: 750px;
}

.tri-agent { padding: 0.5rem; }

.tri-agent .role {
  color: var(--orange);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.tri-agent .desc {
  font-size: 0.9rem;
  color: var(--grey);
}

/* How it works grid */
.how-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin: 2rem 0;
}

.how-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  padding: 1.5rem;
}

.how-card h3 {
  margin: 0 0 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--white);
}

.how-card .icon {
  color: var(--orange);
  font-weight: 700;
}

.how-card p {
  color: var(--grey);
  font-size: 0.95rem;
  margin: 0;
}

/* SDK grid */
.sdk-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
}

.sdk-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  padding: 1.5rem;
}

.sdk-card .lang {
  color: var(--orange);
  font-weight: 700;
  font-size: 1.1rem;
}

.sdk-card .narrative {
  color: var(--white);
  font-size: 0.95rem;
  font-style: italic;
  margin: 0.3rem 0;
}

.sdk-card .detail {
  color: var(--grey);
  font-size: 0.9rem;
}

/* Quote */
.quote {
  border-left: 3px solid var(--orange);
  padding: 1.5rem 2rem;
  margin: 2rem 0;
  background: rgba(247, 147, 26, 0.04);
  border-radius: 0 8px 8px 0;
}

.quote p {
  font-size: 1.15rem;
  color: var(--white);
  margin-bottom: 0;
}

/* Footer */
footer.site-footer {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--grey);
  font-size: 0.85rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin-top: 2rem;
}

footer.site-footer a {
  color: var(--orange);
  text-decoration: none;
}

/* Responsive */
@media (max-width: 700px) {
  .hero-tagline { font-size: 1.2rem; }
  .stat-value { font-size: 2rem; }
  .tri-grid { grid-template-columns: 1fr; }
  .sdk-grid { grid-template-columns: 1fr; }
  .how-grid { grid-template-columns: 1fr; }
  .teasers { grid-template-columns: 1fr; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.8rem; }
  h2 { font-size: 1.5rem; }
  .article h1 { font-size: 1.9rem; }
  .topnav { padding: 0.7rem 1rem; }
}