/* Core Design System & Reset */
:root {
  /* Fonts */
  --font-heading: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* Shared Colors */
  --maroon-hsl: 340, 70%, 40%;
  
  /* Transition */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  
  /* Common Values */
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 18px;
}

/* Light Theme Variables */
:root, :root[data-theme="light"] {
  --bg-color: #f7f9fa;
  --surface-color: #ffffff;
  --text-color: #1a1e21;
  --text-secondary: #5e6b75;
  --border-color: #e2e8f0;
  --maroon-color: hsl(var(--maroon-hsl));
  --maroon-hover: hsl(340, 70%, 30%);
  --maroon-bg-subtle: hsl(340, 100%, 97%);
  --btn-bg-hover: #f1f5f9;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --accent-tint: rgba(139, 30, 63, 0.08);
}

/* Dark Theme Variables */
:root[data-theme="dark"] {
  --bg-color: #0f111a;
  --surface-color: #161925;
  --text-color: #f1f5f9;
  --text-secondary: #94a3b8;
  --border-color: #23283d;
  --maroon-color: hsl(340, 80%, 60%);
  --maroon-hover: hsl(340, 80%, 70%);
  --maroon-bg-subtle: hsl(340, 40%, 15%);
  --btn-bg-hover: #1f2438;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.15);
  --accent-tint: rgba(220, 38, 101, 0.15);
}

/* Global Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-body);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-color);
}

a {
  color: var(--maroon-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--maroon-hover);
}

/* Accent Maroon Branding */
.maroon {
  color: var(--maroon-color) !important;
}

/* Header & Navigation Styles */
.site-header {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.header-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo-area {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.logo-link {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-color);
}

.tagline {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--btn-bg-hover);
  color: var(--text-color);
}

/* Hide theme icons based on current theme */
:root[data-theme="light"] .sun-icon { display: none; }
:root[data-theme="dark"] .moon-icon { display: none; }

.nav-buttons {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-button {
  font-family: var(--font-heading);
  font-size: 0.937rem;
  font-weight: 600;
  padding: 0.5rem 0.875rem;
  border-radius: var(--border-radius-sm);
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.nav-button:hover {
  color: var(--text-color);
  background-color: var(--btn-bg-hover);
}

.nav-button.selected {
  color: var(--maroon-color);
  background-color: var(--maroon-bg-subtle);
  border-color: var(--accent-tint);
}

.nav-button.bordered {
  border: 1px solid var(--maroon-color);
  color: var(--maroon-color);
}

.nav-button.bordered:hover {
  background-color: var(--maroon-color);
  color: #ffffff !important;
}

/* Main Container Styles */
.site-main {
  flex: 1;
  padding: 2.5rem 1.5rem;
}

.main-container {
  max-width: 960px;
  margin: 0 auto;
}

/* Page Header component */
.page-intro {
  margin-bottom: 2.5rem;
  text-align: center;
}

.page-intro h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.page-intro p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Card Base Component */
.card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  padding: 1.5rem; /* Default padding */
}

/* Card typography standardization */
.card h2,
.card h3 {
  color: var(--text-color);
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.937rem;
  line-height: 1.6;
}

/* Interactive Card Component */
.card-interactive {
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card-interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* FAQ Layout styles */
/* Landing Page Layout */
.landing-container.centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 3rem 0;
  position: relative;
}

.landing-glow {
  background: radial-gradient(circle, rgba(139, 30, 63, 0.12) 0%, rgba(220, 38, 101, 0.03) 50%, transparent 100%);
  width: 600px;
  height: 600px;
  filter: blur(80px);
  position: absolute;
  z-index: -1;
  top: -15%;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

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

.landing-title {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

@media (min-width: 768px) {
  .landing-title {
    font-size: 3.75rem;
  }
}

.maroon-text-gradient {
  background: linear-gradient(135deg, var(--maroon-color), #ff6b8b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.landing-text {
  font-size: 1.15rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.landing-ctas {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.cta-button.primary {
  background-color: var(--maroon-color);
  color: #ffffff !important;
  border: 1px solid transparent;
}

.cta-button.primary:hover {
  background-color: var(--maroon-hover);
  transform: translateY(-2px);
}

.cta-button.secondary {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  color: var(--text-color);
}

.cta-button.secondary:hover {
  background-color: var(--btn-bg-hover);
  color: var(--text-color);
  transform: translateY(-2px);
}

.cta-button.secondary .arrow-icon {
  margin-left: 0.5rem;
  transition: transform var(--transition-fast);
}

.cta-button.secondary:hover .arrow-icon {
  transform: translateX(3px);
}

/* Image container styling */
.landing-media.featured {
  width: 100%;
  max-width: 880px;
  margin-top: 3.5rem;
  position: relative;
}

.image-wrapper {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  aspect-ratio: 16 / 9;
  background-color: var(--btn-bg-hover);
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-wrapper:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 20px 30px -5px rgba(0, 0, 0, 0.15), 0 10px 15px -5px rgba(0, 0, 0, 0.05);
  border-color: var(--maroon-color);
}

.landing-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Staff Layout styles */
.staff-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .staff-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.staff-card {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 2.5rem 1.75rem;
}

.staff-image-container {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background-color: var(--btn-bg-hover);
  position: relative;
  overflow: hidden;
  margin-bottom: 1.5rem;
  border: 3px solid var(--border-color);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  flex-shrink: 0;
  transition: border-color var(--transition-fast), transform var(--transition-normal);
}

.staff-card:hover .staff-image-container {
  border-color: var(--maroon-color);
  transform: scale(1.05);
}

.staff-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* Fallback card state when image fails/is missing */
.staff-image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--btn-bg-hover), var(--border-color));
  color: var(--maroon-color);
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 700;
}

.staff-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-grow: 1;
}

.staff-info h2 {
  font-size: 1.45rem;
  margin-bottom: 0.25rem;
}

.staff-role {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--maroon-color);
  margin-bottom: 1rem;
}

/* Sponsor layout */
.sponsors-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
  justify-content: center;
}

@media (min-width: 768px) {
  .sponsors-grid {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  }
}

.sponsor-card {
  padding: 3rem 2rem;
  text-align: center;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.sig-logo-container {
  max-width: 320px;
  width: 100%;
  padding: 1rem;
  background-color: #ffffff; /* Keep background light for corporate logos */
  border-radius: var(--border-radius-md);
  border: 1px solid #e2e8f0;
  display: flex;
  justify-content: center;
  align-items: center;
}

:root[data-theme="dark"] .sig-logo-container {
  background-color: #ffffff; /* Keep logo readable */
}

.sponsor-description {
  font-size: 1.1rem;
}

.accent-link {
  color: var(--maroon-color);
  font-weight: 600;
  border-bottom: 1px dashed var(--maroon-color);
}

.accent-link:hover {
  color: var(--maroon-hover);
  border-bottom-style: solid;
}

/* Past Events navigation bar */
.years-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  padding: 0.5rem;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow);
}

.year-link {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.year-link:hover {
  color: var(--text-color);
  background-color: var(--btn-bg-hover);
}

.year-link.selected {
  background-color: var(--maroon-color);
  color: #ffffff !important;
}

/* Event Detail layout */
.event-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding: 2rem;
}

@media (min-width: 768px) {
  .event-container {
    grid-template-columns: 4fr 5fr;
  }
  .event-container.full-width {
    grid-template-columns: 1fr;
    max-width: 680px;
    margin: 0 auto;
  }
}

.event-details {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.event-details h1 {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.event-description {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.event-video-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--maroon-color);
  margin-bottom: 1.5rem;
}

.event-video-link svg {
  transition: transform var(--transition-fast);
}

.event-video-link:hover svg {
  transform: translateX(3px);
}

.event-stats {
  display: flex;
  gap: 2.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--maroon-color);
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Native CSS Scroll Snap Carousel */
.carousel-wrapper {
  position: relative;
  width: 100%;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
  background-color: var(--btn-bg-hover);
  display: flex;
  flex-direction: column;
  aspect-ratio: 4 / 3;
}

.carousel-track {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  width: 100%;
  height: 100%;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--maroon-color) transparent;
}

.carousel-track::-webkit-scrollbar {
  height: 6px;
}

.carousel-track::-webkit-scrollbar-thumb {
  background-color: var(--maroon-color);
  border-radius: 3px;
}

.carousel-slide {
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  scroll-snap-align: start;
  position: relative;
}

.carousel-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carousel-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carousel-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.75));
  color: #ffffff;
  padding: 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
}

.carousel-empty {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
}

.carousel-empty svg {
  color: var(--maroon-color);
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* Footer styling */
.site-footer {
  background-color: var(--surface-color);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: auto;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.footer-container {
  max-width: 960px;
  margin: 0 auto;
}

/* Responsive Navigation adjustments */
@media (max-width: 600px) {
  .header-container {
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
  }
  .header-controls {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }
  .theme-toggle-btn {
    align-self: flex-end;
  }
  .nav-buttons {
    flex-wrap: wrap;
    justify-content: center;
  }
  .nav-button {
    font-size: 0.875rem;
    padding: 0.4rem 0.6rem;
  }
  .event-stats {
    gap: 1.5rem;
  }
}