/* ============================================================
   CNRL Open House 2026 — Stylesheet
   Chiari Malformation Awareness Purple theme
   ============================================================ */

/* ----- CSS Custom Properties ----- */
:root {
  --nu-red:        #6B35A0;
  --nu-dark-red:   #4D2280;
  --nu-black:      #1a1a1a;
  --nu-white:      #ffffff;
  --nu-light-gray: #f5f5f5;
  --nu-mid-gray:   #e0e0e0;
  --nu-text-gray:  #555555;

  --nav-height: 60px;
  --max-width:  1100px;
  --radius:     6px;
  --shadow:     0 2px 8px rgba(0,0,0,0.10);
}

/* ----- Reset & Base ----- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--nu-black);
  background: var(--nu-white);
}

a { color: var(--nu-red); text-decoration: none; }
a:hover { color: var(--nu-dark-red); text-decoration: underline; }

img { max-width: 100%; display: block; }

/* ----- Layout Helpers ----- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 72px 0; }
#about { padding-top: 32px; }
.section-white { background: var(--nu-white); }
.section-gray  { background: var(--nu-light-gray); }

/* ----- Navigation ----- */
#navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nu-red);
  height: var(--nav-height);
  box-shadow: 0 2px 6px rgba(0,0,0,0.25);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
}

.nav-brand {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--nu-white);
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.nav-brand:hover { color: rgba(255,255,255,0.85); text-decoration: none; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  display: block;
  padding: 6px 14px;
  color: rgba(255,255,255,0.9);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: background 0.15s, color 0.15s;
}
.nav-links a:hover,
.nav-links a.active {
  background: rgba(255,255,255,0.18);
  color: var(--nu-white);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--nu-white);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px 8px;
}

/* ----- Hero ----- */
#hero {
  background:
    linear-gradient(135deg, rgba(26,10,50,0.62) 0%, rgba(75,30,120,0.65) 100%),
    url('../images/ISECoutside.jpg') center / cover no-repeat;
  color: var(--nu-white);
  padding: 100px 24px 80px;
  text-align: center;
}

/* ----- Logo Bar ----- */
.logo-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
  padding: 16px 24px;
  background: #ffffff;
}

.logo-bar-img {
  height: 120px;
  width: auto;
  object-fit: contain;
  border-radius: var(--radius);
}

.logo-bar-img--light {
  background: #ffffff;
  padding: 10px 18px;
  border-radius: var(--radius);
}

.hero-content { max-width: 720px; margin: 0 auto; }

.hero-label {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.65);
  margin-bottom: 16px;
}

#hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  color: var(--nu-white);
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-date {
  font-size: 1.4rem;
  font-weight: 600;
  color: #d4a8f0;
  margin-bottom: 10px;
}

.hero-venue {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
  line-height: 1.5;
}

.btn-primary {
  display: inline-block;
  background: var(--nu-red);
  color: var(--nu-white);
  padding: 14px 36px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.1s;
  letter-spacing: 0.03em;
}
.btn-primary:hover {
  background: var(--nu-dark-red);
  color: var(--nu-white);
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-register {
  display: inline-block;
  background: transparent;
  color: var(--nu-white);
  border: 2px solid rgba(255,255,255,0.75);
  padding: 13px 34px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.2s, border-color 0.2s, transform 0.1s;
  letter-spacing: 0.03em;
  margin-left: 14px;
}
.btn-register:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--nu-white);
  color: var(--nu-white);
  text-decoration: none;
  transform: translateY(-1px);
}

.hero-cta { display: flex; gap: 0; justify-content: center; flex-wrap: wrap; }

.hero-sponsor {
  margin-top: 28px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.hero-sponsor-link {
  color: rgba(255,255,255,0.85);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(255,255,255,0.35);
}
.hero-sponsor-link:hover {
  color: var(--nu-white);
  text-decoration-color: rgba(255,255,255,0.8);
}

/* ----- Venue Photo Strip ----- */
.venue-strip {
  position: relative;
  height: 300px;
  overflow: hidden;
}
.venue-strip img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.venue-strip-overlay {
  position: absolute;
  inset: 0;
  background: rgba(26,26,26,0.42);
  display: flex;
  align-items: center;
  justify-content: center;
}
.venue-strip-label {
  color: var(--nu-white);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-shadow: 0 2px 10px rgba(0,0,0,0.7);
  text-align: center;
}
.venue-strip-label small {
  display: block;
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  margin-top: 6px;
  opacity: 0.85;
  text-transform: none;
}

/* ----- Section Titles ----- */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--nu-red);
  margin-bottom: 8px;
  position: relative;
  padding-bottom: 14px;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--nu-red);
  border-radius: 2px;
}

.section-subtitle {
  color: var(--nu-text-gray);
  font-size: 1rem;
  margin-bottom: 40px;
  margin-top: 6px;
}

/* ----- About ----- */
.about-body p {
  max-width: 760px;
  color: #333;
  margin-bottom: 18px;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.highlight-card {
  background: var(--nu-light-gray);
  border-left: 4px solid var(--nu-red);
  border-radius: var(--radius);
  padding: 24px 20px;
}
.highlight-icon { font-size: 2rem; display: block; margin-bottom: 10px; }
.highlight-card h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--nu-black); }
.highlight-card p  { font-size: 0.9rem; color: var(--nu-text-gray); margin: 0; }

/* ----- Schedule ----- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--nu-white);
  font-size: 0.95rem;
}

.schedule-table thead th {
  background: var(--nu-red);
  color: var(--nu-white);
  padding: 14px 18px;
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.schedule-table tbody tr { border-bottom: 1px solid var(--nu-mid-gray); }
.schedule-table tbody tr:last-child { border-bottom: none; }

.schedule-table tbody td {
  padding: 14px 18px;
  vertical-align: top;
  color: var(--nu-black);
}

.schedule-table tbody td:first-child {
  white-space: nowrap;
  color: var(--nu-text-gray);
  font-size: 0.88rem;
  font-weight: 500;
  width: 180px;
}

.schedule-table tbody tr:nth-child(odd) { background: #fafafa; }
.schedule-table tbody tr:nth-child(even) { background: var(--nu-white); }

.session-talk td:nth-child(2)    { border-left: 3px solid var(--nu-red); }
.session-poster td:nth-child(2)  { border-left: 3px solid #c4a0e8; }
.session-patient td:nth-child(2) { border-left: 3px solid #9b59c0; }

/* ----- Speaker group heading ----- */
.speaker-group-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--nu-black);
  margin-bottom: 24px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--nu-mid-gray);
}

/* ----- Speakers ----- */
.speakers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.speaker-card {
  background: var(--nu-white);
  border: 1px solid var(--nu-mid-gray);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.speaker-img {
  width: 100%;
  height: 280px;
  object-fit: contain;
  background: var(--nu-light-gray);
  display: block;
}

.speaker-img-placeholder {
  width: 100%;
  height: 160px;
  background: var(--nu-light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--nu-mid-gray);
  border-bottom: 3px solid var(--nu-red);
}

.speaker-info { padding: 20px; }

.speaker-info h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--nu-black);
  margin-bottom: 4px;
}
.speaker-title {
  font-size: 0.85rem;
  color: var(--nu-red);
  font-weight: 600;
  margin-bottom: 10px;
}
.speaker-bio {
  font-size: 0.88rem;
  color: var(--nu-text-gray);
  line-height: 1.55;
}

/* ----- Posters ----- */
.poster-list {
  list-style: none;
  counter-reset: poster-counter;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
}

.poster-list li {
  counter-increment: poster-counter;
  background: var(--nu-white);
  border: 1px solid var(--nu-mid-gray);
  border-radius: var(--radius);
  padding: 18px 20px 18px 52px;
  position: relative;
  box-shadow: var(--shadow);
}

.poster-list li::before {
  content: counter(poster-counter);
  position: absolute;
  left: 16px;
  top: 18px;
  width: 26px;
  height: 26px;
  background: var(--nu-red);
  color: var(--nu-white);
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.poster-list li strong { color: var(--nu-black); font-size: 0.95rem; display: block; margin-bottom: 4px; }
.poster-list li em    { color: var(--nu-text-gray); font-size: 0.88rem; font-style: normal; }

/* ----- Location ----- */
.location-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.location-info h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--nu-red);
  margin-top: 24px;
  margin-bottom: 8px;
}
.location-info h3:first-child { margin-top: 0; }

.location-info p { color: #333; margin-bottom: 8px; }

.location-list {
  padding-left: 20px;
  color: #333;
}
.location-list li { margin-bottom: 8px; font-size: 0.95rem; }

.location-map iframe {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ----- Footer ----- */
#footer {
  background: var(--nu-black);
  color: rgba(255,255,255,0.7);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-lab {
  font-size: 1rem;
  font-weight: 700;
  color: var(--nu-white);
  margin-bottom: 6px;
}
.footer-affil { font-size: 0.85rem; line-height: 1.5; }

.footer-right { text-align: right; }
.footer-right a { color: #c4a0e8; font-size: 0.9rem; }
.footer-right a:hover { color: var(--nu-white); }
.footer-copy { font-size: 0.78rem; margin-top: 8px; color: rgba(255,255,255,0.4); }

/* ----- Responsive ----- */
@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--nu-dark-red);
    padding: 12px 16px 16px;
    gap: 2px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 14px; font-size: 1rem; }

  .location-grid { grid-template-columns: 1fr; }

  .footer-inner { flex-direction: column; }
  .footer-right { text-align: left; }

  .section { padding: 48px 0; }

  #hero { padding: 64px 24px 52px; }
}

@media (max-width: 480px) {
  .poster-list { grid-template-columns: 1fr; }
  .speakers-grid { grid-template-columns: 1fr; }
  .about-highlights { grid-template-columns: 1fr; }

  .schedule-table tbody td:first-child { width: auto; white-space: normal; }
}