/* ===== CSS Variables & Base ===== */
:root{
  --bg: #0b1020;
  --bg-elev: rgba(255,255,255,0.06);
  --text: #e7e9ef;
  --muted: #b9bfd1;
  --accent: #8cd1ff;
  --accent-2: #c4a8ff;
  --card: rgba(255,255,255,0.08);
  --border: rgba(255,255,255,0.12);
  --shadow: 0 10px 30px rgba(0,0,0,0.45), inset 0 0 0 1px var(--border);
  --radius: 18px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body{
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  color: var(--text);
  background: radial-gradient(1200px 800px at 10% 0%, #0f1630 0%, #0b1020 45%, #090d19 100%);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.wrap{
  width: min(1100px, 92vw);
  margin-inline: auto;
}

/* ===== Header ===== */
.site-header{
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(1.1) blur(8px);
  background: linear-gradient(180deg, rgba(10,13,25,0.9), rgba(10,13,25,0.4));
  border-bottom: 1px solid var(--border);
}
.site-header .wrap{
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0;
}
.brand{
  display: inline-flex; gap: 10px; align-items: center; text-decoration: none; color: var(--text);
  font-weight: 700;
}
.logo{
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0a0f1f; font-size: 20px; font-family: "Fraunces", serif;
  box-shadow: var(--shadow);
}
.brand-text{ letter-spacing: .2px; }

.site-nav a{
  color: var(--muted); text-decoration: none; margin-left: 20px; font-weight: 500;
}
.site-nav a:hover{ color: var(--text); }

/* ===== Hero ===== */
.hero{
  position: relative; overflow: clip;
  padding: 80px 0 60px;
}
.hero .hero-content{
  max-width: 840px;
}
h1{
  font-family: "Fraunces", serif;
  font-size: clamp(36px, 5vw, 62px);
  line-height: 1.08; margin: 0 0 14px;
}
.accent{
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede{
  font-size: clamp(16px, 1.7vw, 20px);
  color: var(--muted);
  margin: 0;
}

/* Decorative background elements */
.bg-orb{
  position: absolute; width: 380px; height: 380px; border-radius: 50%;
  filter: blur(60px); opacity: 0.35;
}
.orb-1{ background: #8cd1ff; top: -80px; right: -120px; }
.orb-2{ background: #c4a8ff; bottom: -120px; left: -60px; }

.bg-grid{
  position: absolute; inset: 0; opacity: 0.08; background-image:
    linear-gradient(transparent 31px, rgba(255,255,255,0.12) 32px),
    linear-gradient(90deg, transparent 31px, rgba(255,255,255,0.12) 32px);
  background-size: 32px 32px;
  mask: radial-gradient(800px 500px at 70% 10%, #000 60%, transparent 100%);
}

/* ===== Video Section ===== */
.video-section{ padding: 32px 0 8px; }
.card{
  background: var(--card);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  padding: 18px;
  border: 1px solid var(--border);
}
.video-embed{
  position: relative; width: 100%; border-radius: calc(var(--radius) - 6px); overflow: hidden;
  background: #000;
}
.ratio-16x9::before{
  content: ""; display: block; padding-top: 56.25%;
}
.video-embed iframe{
  position: absolute; inset: 0; width: 100%; height: 100%; border: 0;
}
.video-meta{
  padding: 10px 6px 0;
}
.video-meta h2{
  margin: 12px 0 6px; font-size: 22px;
}
.ext{ color: var(--accent); }
.ext:hover{ text-decoration: underline; }

/* ===== About ===== */
.about-section{ padding: 48px 0; }
.grid-2{
  display: grid; gap: 26px;
  grid-template-columns: 1.2fr 0.8fr;
}
.note{
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}

/* ===== Topics (bullet list) ===== */
.topics-section{ padding: 30px 0 80px; }
.topics-intro{
  color: var(--muted);
  margin: 8px 0 16px;
}
.topics{
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 12px;
}
.topics li{
  position: relative;
  padding: 14px 16px 14px 48px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255,255,255,0.04);
}
.topics li::before{
  content: "•";
  position: absolute; left: 18px; top: 50%; transform: translateY(-50%);
  font-size: 28px; line-height: 1;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.topics li strong{
  color: var(--text);
}

/* ===== Footer ===== */
.site-footer{
  border-top: 1px solid var(--border);
  padding: 26px 0; color: var(--muted);
  background: linear-gradient(180deg, rgba(10,13,25,0.4), rgba(10,13,25,0.9));
}

/* ===== Responsive ===== */
@media (max-width: 880px){
  .grid-2{ grid-template-columns: 1fr; }
  .site-nav a{ margin-left: 14px; }
}
@media (max-width: 520px){
  .site-nav{ display: none; }
}

/* ===== Accessibility tweaks ===== */
@media (prefers-reduced-motion: reduce){
  .bg-orb, .bg-grid { display: none; }
}