:root {
  --bg-black: #06080d;
  --bg-card: rgba(18, 22, 33, 0.7);
  --border-card: rgba(138, 209, 204, 0.18);
  --text-primary: #f0f4f8;
  --text-muted: #94a3b8;
  --accent-cyan: #8ad1cc;
  --accent-cyan-hover: #b2e4e0;
  --font-heading: 'Space Grotesk', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background-color: var(--bg-black);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  background-image: 
    radial-gradient(ellipse at 50% -20%, rgba(138, 209, 204, 0.12), transparent 70%),
    radial-gradient(circle at 85% 30%, rgba(26, 42, 64, 0.3), transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 8, 13, 0.85);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
}
.brand-logo {
  text-decoration: none;
  display: flex;
  flex-direction: column;
  letter-spacing: 0.18em;
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.05;
}
.logo-sub, .logo-foot { color: #ffffff; font-size: 1.15rem; }
.logo-main { color: var(--accent-cyan); font-size: 1.15rem; }

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 24px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--accent-cyan);
}

/* Hero Section */
.hero {
  padding: 70px 0 45px;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.hero h1 {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.hero h1 span { color: var(--accent-cyan); }
.hero-tagline {
  color: var(--text-muted);
  font-size: 1.2rem;
  margin-top: 12px;
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

/* Seminar Cards */
.seminars-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin: 45px 0 70px;
}
.seminar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
  transition: transform 0.2s, border-color 0.2s;
}
.seminar-card:hover {
  border-color: var(--accent-cyan);
}
.seminar-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 15px;
  font-size: 0.88rem;
  color: var(--accent-cyan);
  font-weight: 600;
}
.seminar-body {
  display: flex;
  gap: 24px;
}
.speaker-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent-cyan);
  flex-shrink: 0;
}
.seminar-info { flex: 1; }
.seminar-title {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  color: #ffffff;
  margin-bottom: 6px;
}
.speaker-meta {
  color: var(--accent-cyan);
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 14px;
}
.speaker-meta .affiliation {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.95rem;
}
.seminar-abstract {
  color: #cbd5e1;
  font-size: 0.96rem;
  margin-bottom: 14px;
}
.speaker-bio {
  font-size: 0.88rem;
  color: var(--text-muted);
  border-left: 2px solid rgba(138, 209, 204, 0.4);
  padding-left: 12px;
  margin-bottom: 16px;
  font-style: italic;
}

/* Buttons */
.btn-stream {
  display: inline-block;
  background: var(--accent-cyan);
  color: #06080d;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.9rem;
  transition: background 0.2s;
}
.btn-stream:hover { background: var(--accent-cyan-hover); }

/* Video Embeds */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: 8px;
  margin-top: 16px;
}
.video-wrapper iframe {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%; border: 0;
}

/* Footer & Logos */
.site-footer {
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: #040508;
  padding: 45px 0 25px;
}
.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.organizer-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.organizer-logos {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.logo-badge {
  display: flex;
  flex-direction: column;
  padding: 10px 16px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  text-decoration: none;
  color: #fff;
}
.org-rise { font-weight: 800; font-size: 1.25rem; letter-spacing: 0.1em; font-family: var(--font-heading); }
.org-cain { font-weight: 700; font-size: 0.95rem; letter-spacing: 0.08em; font-family: var(--font-heading); }
.logo-badge .highlight { color: var(--accent-cyan); }
.logo-badge .org-sub { font-size: 0.68rem; color: var(--text-muted); }
.footer-bottom {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding-top: 20px;
}

@media(max-width: 680px) {
  .seminar-body { flex-direction: column; }
  .header-inner { flex-direction: column; gap: 15px; }
  .nav-links a { margin: 0 10px; }
}