/* ===================================
   CSS Variables & Base Styles
   =================================== */

:root {
  /* Colors - Dark mode professional palette */
  --primary-color: #60a5fa;
  --primary-dark: #3b82f6;
  --secondary-color: #94a3b8;
  --accent-color: #38bdf8;

  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-light: #94a3b8;

  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-dark: #020617;

  --border-color: #334155;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Container */
  --container-max-width: 1200px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* ===================================
   Reset & Base Styles
   =================================== */

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--text-primary);
  line-height: var(--line-height-base);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.nav-open {
  overflow: hidden;
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-md);
}

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

a:hover {
  color: var(--primary-dark);
}

ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-xs);
}

strong {
  font-weight: 600;
}

/* ===================================
   Layout Components
   =================================== */

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ===================================
   Header & Navigation
   =================================== */

.site-header {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.header-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-link {
  display: block;
  line-height: 0;
  transition: opacity var(--transition-fast);
}

.logo-link:hover {
  opacity: 0.8;
}

.site-logo {
  height: 40px;
  width: auto;
  display: block;
  color: var(--text-primary);
}

.site-year {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary-color);
  background-color: var(--bg-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  z-index: 1001;
}

.hamburger {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-base);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Navigation */
.site-nav {
  display: flex;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  padding: 0;
  margin: 0;
}

.nav-list a {
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--spacing-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--primary-color);
}

.nav-list a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--primary-color);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: var(--bg-primary);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    padding-top: 80px;
  }

  .site-nav.active {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
  }

  .nav-list a {
    font-size: 1.25rem;
    padding: var(--spacing-sm) 0;
  }
}

/* ===================================
   Hero Section
   =================================== */

.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #581c87 100%);
  color: white;
  padding: var(--spacing-2xl) var(--spacing-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(30, 58, 138, 0.95) 0%, rgba(88, 28, 135, 0.95) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin: 0 auto;
}

.hero-logo {
  margin: 0 auto var(--spacing-lg);
  max-width: 900px;
  display: flex;
  justify-content: center;
}

.hero-logo img {
  width: 100%;
  height: auto;
  display: block;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
}

.hero-date {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ===================================
   Buttons
   =================================== */

.cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin: var(--spacing-lg) 0;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: 6px;
  transition: all var(--transition-base);
  cursor: pointer;
  border: 2px solid transparent;
  font-size: 1rem;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--bg-dark);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  color: var(--bg-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(96, 165, 250, 0.3);
}

.btn-secondary {
  background-color: transparent;
  color: white;
  border-color: white;
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* ===================================
   Sections
   =================================== */

section {
  padding: var(--spacing-2xl) 0;
}

section:nth-child(even) {
  background-color: var(--bg-secondary);
}

section h2 {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  font-size: 2.25rem;
}

/* About Section */
.about {
  background-color: var(--bg-primary);
}

.about p {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.125rem;
  color: var(--text-secondary);
  text-align: center;
}

/* Highlights Grid */
.highlights {
  background-color: var(--bg-secondary);
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.highlight-item {
  background-color: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid var(--border-color);
}

.highlight-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  border-color: var(--primary-color);
}

.highlight-item h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.highlight-item p {
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* Venues */
.venues {
  background-color: var(--bg-primary);
}

.venue-item {
  margin-bottom: var(--spacing-2xl);
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

.venue-item:last-child {
  margin-bottom: 0;
}

.venue-item img {
  width: 100%;
  height: auto;
  display: block;
}

.venue-info {
  padding: var(--spacing-lg);
}

.venue-info h3 {
  color: var(--primary-color);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.venue-info p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-bottom: 0;
}

/* Content Images */
.content-image {
  margin-bottom: var(--spacing-2xl);
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

.content-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===================================
   Inner Pages
   =================================== */

.inner-page {
  padding: var(--spacing-2xl) 0;
}

.page-article {
  max-width: 800px;
  margin: 0 auto;
}

.page-article h1 {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--border-color);
}

.page-article h2 {
  margin-top: var(--spacing-xl);
  text-align: left;
}

.page-article h3 {
  margin-top: var(--spacing-lg);
}

/* ===================================
   Footer
   =================================== */

.site-footer {
  background-color: var(--bg-dark);
  color: #cbd5e1;
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  color: white;
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
}

.footer-section h4 {
  color: white;
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
}

.footer-section p {
  margin-bottom: var(--spacing-sm);
}

.footer-section ul {
  list-style: none;
  padding: 0;
}

.footer-section a {
  color: #cbd5e1;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid #334155;
  color: #94a3b8;
  font-size: 0.875rem;
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
  :root {
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
  }

  .site-logo {
    height: 32px;
  }

  .site-year {
    font-size: 0.75rem;
    padding: 0.2rem 0.4rem;
  }

  h1 {
    font-size: 2rem;
  }

  .hero-logo {
    max-width: 600px;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }

  .hero-date {
    font-size: 1rem;
  }

  .hero-cta,
  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

  section h2 {
    font-size: 1.75rem;
  }

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

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .hero h1 {
    font-size: 2.5rem;
  }
}

/* ===================================
   Email Signup Form
   =================================== */

.email-signup-form {
  max-width: 500px;
  margin: var(--spacing-xl) auto;
  padding: var(--spacing-lg);
}

/* ===================================
   Utilities
   =================================== */

.text-center {
  text-align: center;
}

.mb-0 {
  margin-bottom: 0;
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

/* ===================================
   Sponsorship Table
   =================================== */

.sponsorship-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2em 0;
  font-family: var(--font-family);
}

.sponsorship-table th,
.sponsorship-table td {
  border: 1px solid var(--border-color);
  padding: 12px 15px;
  text-align: center;
}

.sponsorship-table thead th {
  background-color: var(--bg-secondary);
  color: var(--primary-color);
  font-weight: 600;
  font-size: 1.1em;
  border-bottom: 2px solid var(--primary-color);
}

.sponsorship-table tbody tr {
  background-color: transparent;
  transition: background-color var(--transition-fast);
}

.sponsorship-table tbody tr:hover {
  background-color: rgba(96, 165, 250, 0.05);
}

.sponsorship-table tbody td:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--text-secondary);
}

.sponsorship-table .price-row {
  font-size: 1.3em;
  font-weight: bold;
  color: var(--primary-color);
}

.sponsorship-table .price-row td:first-child {
  color: var(--text-secondary);
}

.sponsorship-table .checkmark {
  color: var(--primary-color);
  font-size: 1.5em;
}

.sponsorship-table .limit-note {
  font-size: 0.85em;
  color: var(--text-light);
  display: block;
  margin-top: 4px;
}

.sponsorship-note {
  margin-top: 1em;
  font-style: italic;
  color: var(--text-secondary);
}