/* RunlightAI Shared Design System — matches index.html V3 */
@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Satoshi:wght@300;400;500;600;700&display=swap');

:root {
  --bg: #0B0D11;
  --bg-raised: #12151B;
  --bg-card: rgba(255,255,255,0.04);
  --border: rgba(255,255,255,0.07);
  --text: #E8E6E1;
  --text-dim: rgba(255,255,255,0.45);
  --text-mid: rgba(255,255,255,0.65);
  --accent: #F06543;
  --accent-glow: rgba(240,101,67,0.15);
  --accent2: #7B61FF;
  --glass: rgba(255,255,255,0.03);
  --glass-border: rgba(255,255,255,0.08);
  --gradient-hero: linear-gradient(135deg, #F06543 0%, #7B61FF 50%, #3ECFB2 100%);
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'Satoshi', -apple-system, BlinkMacSystemFont, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

/* NAV */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(11,13,17,0.75);
  backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}

.logo {
  font-family: var(--font-body);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo span { color: var(--accent); }

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

.nav-links a {
  color: var(--text-mid);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-links a:hover { color: var(--text); }

.nav-cta {
  background: var(--accent);
  color: white;
  padding: 0.55rem 1.3rem;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
}

.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }

/* PAGE HERO (for inner pages) */
.page-hero {
  padding: 10rem 2rem 4rem;
  text-align: center;
  position: relative;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 60%);
  filter: blur(100px);
  pointer-events: none;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 400;
  line-height: 1.15;
  max-width: 700px;
  margin: 0 auto 1.5rem;
  position: relative;
}

.page-hero h1 em {
  font-style: italic;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-hero .subtitle {
  font-size: 1.1rem;
  color: var(--text-mid);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.75;
}

/* CONTENT SECTIONS */
section {
  padding: 5rem 2rem;
  position: relative;
  z-index: 1;
}

.section-inner {
  max-width: 740px;
  margin: 0 auto;
}

.section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

/* PROSE (for blog posts / about page) */
.prose {
  max-width: 700px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text);
}

.prose p {
  margin-bottom: 1.5rem;
}

.prose h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 400;
  margin: 3rem 0 1.2rem;
  color: var(--text);
}

.prose h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2.5rem 0 1rem;
  color: var(--text);
}

.prose strong {
  color: var(--text);
  font-weight: 600;
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity 0.3s;
}

.prose a:hover { opacity: 0.8; }

.prose ul, .prose ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.prose li {
  margin-bottom: 0.6rem;
  color: var(--text-mid);
}

.prose li strong { color: var(--text); }

.prose blockquote {
  border-left: 3px solid var(--accent);
  padding: 1rem 0 1rem 1.5rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--text-mid);
  font-size: 1.1rem;
}

.prose .callout {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  margin: 2rem 0;
}

.prose .callout-title {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* GLASS CARDS */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 2rem;
  backdrop-filter: blur(12px);
}

/* TAGS / BADGES */
.tag {
  display: inline-block;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  color: var(--text-mid);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3rem 0.8rem;
  border-radius: 6px;
}

/* CTA SECTION */
.cta-section {
  text-align: center;
  padding: 6rem 2rem;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  filter: blur(80px);
  pointer-events: none;
}

.btn-main {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent);
  color: white;
  padding: 1rem 2.2rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  position: relative;
}

.btn-main:hover { opacity: 0.9; transform: translateY(-2px); }

/* FOOTER */
footer {
  padding: 2.5rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

footer a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  nav { padding: 0.8rem 1.2rem; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.8rem; }
  .page-hero { padding: 8rem 1.5rem 3rem; }
  section { padding: 3rem 1.5rem; }
  .prose { font-size: 1rem; }
}

@media (max-width: 480px) {
  .nav-links { display: none; }
  .page-hero h1 { font-size: 2rem; }
}