:root {
  --bg: #0b0d12;
  --bg-alt: #12151c;
  --surface: #171b24;
  --border: #262b36;
  --text: #e8eaed;
  --text-dim: #9aa3b2;
  --accent: #5b8cff;
  --accent-soft: rgba(91, 140, 255, 0.12);
  --accent-2: #7cf2c2;
  --radius: 14px;
  --max-w: 1080px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fa;
    --bg-alt: #ffffff;
    --surface: #ffffff;
    --border: #e4e7ec;
    --text: #1a1d24;
    --text-dim: #5c6472;
    --accent: #3660d6;
    --accent-soft: rgba(54, 96, 214, 0.08);
    --accent-2: #128a5e;
  }
}

@media (max-width: 700px) {
  .date-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .date {
    white-space: normal;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.nav-brand {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
  letter-spacing: 0.01em;
}
.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
  padding: 96px 0 72px;
  background:
    radial-gradient(600px circle at 15% -10%, var(--accent-soft), transparent 60%),
    radial-gradient(500px circle at 90% 0%, rgba(124, 242, 194, 0.08), transparent 60%);
  border-bottom: 1px solid var(--border);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 24px;
}
h1 {
  font-size: clamp(2rem, 4.2vw, 3.1rem);
  line-height: 1.15;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.hero-sub {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 680px;
  margin: 0 0 32px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  margin-bottom: 32px;
}
.meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--text-dim);
}
.meta-item strong { color: var(--text); font-weight: 600; }
.meta-icon { font-size: 1rem; }

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { text-decoration: none; filter: brightness(1.08); }
.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { text-decoration: none; border-color: var(--accent); }

/* Section shared */
section { padding: 40px 0; border-bottom: 1px solid var(--border); }
section:last-of-type { border-bottom: none; }
.section-head { margin-bottom: 36px; }
.section-tag {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  margin: 0;
  letter-spacing: -0.01em;
}
.lede {
  color: var(--text-dim);
  font-size: 1.02rem;
  max-width: 760px;
  margin-top: 12px;
}

/* Topics grid */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(200px, 1fr));
  gap: 16px;
}
.topic-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.topic-card h3 {
  font-size: 1rem;
  margin: 0 0 6px;
}
.topic-card p {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin: 0;
}

/* Agenda */
.agenda-list {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}
.agenda-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
}
.agenda-row:last-child { border-bottom: none; }
.agenda-time {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.9rem;
  white-space: nowrap;
}
.agenda-activity { font-size: 0.96rem; }
.agenda-activity .sub { color: var(--text-dim); font-size: 0.87rem; }

/* Speaker / organizer cards */
.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}
.person-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.person-name { font-weight: 700; font-size: 1rem; margin-bottom: 4px; }
.person-role { color: var(--accent); font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }
.person-affil { color: var(--text-dim); font-size: 0.85rem; }

.keynote-card {
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border));
  border-radius: var(--radius);
  padding: 24px 26px;
  margin-top: 20px;
}
.keynote-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

/* Info panels (relevance / audience / publication) */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.info-card h3 {
  font-size: 0.95rem;
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.info-card p { color: var(--text-dim); font-size: 0.92rem; margin: 0; }

/* Footer / contact */
.contact-box {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
}
.contact-box h3 { margin: 0 0 6px; font-size: 1.15rem; }
.contact-box p { margin: 0; color: var(--text-dim); }

footer {
  padding: 32px 0 48px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* Important dates */
.dates-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.date-row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  align-items: center;
}

.date-row:last-child {
  border-bottom: none;
}

.date {
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}

.event {
  color: var(--text);
}

.keynote-card {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border));
  border-radius: var(--radius);
  padding: 24px 26px;
}

.speaker-photo {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--border);
}

.speaker-info {
  flex: 1;
}

@media (max-width: 700px) {
  .keynote-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .speaker-photo {
    width: 120px;
    height: 120px;
  }
}

.footer-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 5px;
    flex-wrap: wrap;
    margin-bottom: 5px;
}

.footer-logos img {
    height: 45px;
    width: auto;
    object-fit: contain;
}

code, .mono { font-family: "SFMono-Regular", Consolas, monospace; }