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

:root {
  --primary-color: #2e2e38;
  --secondary-color: #FFE600;
  --accent-color: #FF6B35;
  --text-color: #2e2e38;
  --text-light: #747480;
  --bg-color: #f5f5f5;
  --white: #ffffff;
  --border-color: #e0e0e0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica", "Arial", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

/* Header */
.header {
  background-color: var(--primary-color);
  color: var(--white);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo a {
  display: flex;
  align-items: center;
  background-color: #1a1a24;
  padding: 8px;
  border-radius: 4px;
}

.header-title {
  font-size: 18px;
  font-weight: 600;
}

.header-nav {
  display: flex;
  gap: 32px;
}

.header-nav a {
  color: var(--white);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  opacity: 0.9;
  transition: opacity 0.2s;
}

.header-nav a:hover {
  opacity: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-decoration: none;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
}

.btn-block {
  width: 100%;
}

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

.btn-primary:hover {
  background-color: #e6cf00;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
  background-color: var(--primary-color);
  color: var(--white);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1a24 0%, #2e2e38 50%, #3d3d4d 100%);
  padding: 120px 24px 80px;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23FFE600' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-badge {
  display: inline-block;
  background-color: var(--secondary-color);
  color: var(--primary-color);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 56px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
  line-height: 1.1;
}

.hero-tagline {
  font-size: 28px;
  color: var(--secondary-color);
  font-style: italic;
  margin-bottom: 8px;
}

.hero-subtitle {
  font-size: 18px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
}

.hero-details {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 40px;
}

.hero-detail {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--white);
  font-size: 16px;
}

.detail-icon {
  font-size: 20px;
}

/* Countdown */
.countdown {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 40px;
}

.countdown-item {
  background-color: rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 20px 28px;
  min-width: 100px;
}

.countdown-value {
  display: block;
  font-size: 42px;
  font-weight: 700;
  color: var(--secondary-color);
  line-height: 1;
}

.countdown-label {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 16px;
}

/* Sections */
.section {
  padding: 80px 24px;
}

.section-alt {
  background-color: var(--white);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-badge {
  display: inline-block;
  background-color: var(--bg-color);
  color: var(--text-light);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.section-badge.warning {
  background-color: #fff3cd;
  color: #856404;
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-light);
  max-width: 700px;
  margin: 0 auto;
}

/* Pillars Grid */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 60px;
}

.pillar-card {
  background-color: var(--white);
  padding: 40px 32px;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
  transition: transform 0.3s, box-shadow 0.3s;
}

.pillar-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.1);
}

.pillar-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  border-radius: 50%;
}

.pillar-icon.people { background-color: #e3f2fd; }
.pillar-icon.planet { background-color: #e8f5e9; }
.pillar-icon.progress { background-color: #fff3e0; }

.pillar-card h3 {
  font-size: 24px;
  margin-bottom: 12px;
}

.pillar-card p {
  color: var(--text-light);
  font-size: 15px;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  background-color: var(--primary-color);
  padding: 48px;
  border-radius: 16px;
}

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

.stat-value {
  display: block;
  font-size: 48px;
  font-weight: 700;
  color: var(--secondary-color);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Agenda */
.agenda-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.agenda-day {
  display: flex;
  gap: 32px;
  background-color: var(--bg-color);
  padding: 32px;
  border-radius: 16px;
}

.agenda-date {
  flex-shrink: 0;
  width: 80px;
  text-align: center;
  background-color: var(--primary-color);
  color: var(--white);
  padding: 20px;
  border-radius: 12px;
}

.date-day {
  display: block;
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
}

.date-month {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.agenda-content h3 {
  font-size: 20px;
  margin-bottom: 16px;
  color: var(--text-color);
}

.agenda-events {
  list-style: none;
}

.agenda-events li {
  padding: 8px 0;
  color: var(--text-light);
  border-bottom: 1px solid var(--border-color);
}

.agenda-events li:last-child {
  border-bottom: none;
}

.event-time {
  display: inline-block;
  font-weight: 600;
  color: var(--text-color);
  min-width: 100px;
}

/* Speakers */
.speakers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.speaker-card {
  background-color: var(--white);
  padding: 32px;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.speaker-avatar {
  width: 80px;
  height: 80px;
  margin: 0 auto 16px;
  background-color: var(--primary-color);
  color: var(--secondary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
}

.speaker-card h4 {
  font-size: 18px;
  margin-bottom: 4px;
}

.speaker-role {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 8px;
}

.speaker-topic {
  color: var(--accent-color);
  font-size: 13px;
  font-weight: 600;
}

.speakers-more {
  text-align: center;
  margin-top: 40px;
  color: var(--text-light);
}

/* Challenges */
.challenges-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.challenge-card {
  background-color: var(--bg-color);
  padding: 40px 32px;
  border-radius: 16px;
  text-align: center;
}

.challenge-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.challenge-card h3 {
  font-size: 24px;
  margin-bottom: 12px;
}

.challenge-card p {
  color: var(--text-light);
  margin-bottom: 16px;
}

.challenge-prize {
  display: inline-block;
  background-color: var(--secondary-color);
  color: var(--primary-color);
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
}

/* Registration */
.register-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.register-features {
  margin-top: 32px;
}

.register-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  font-size: 16px;
}

.register-feature span {
  color: #28a745;
  font-weight: bold;
}

.register-form-card {
  background-color: var(--white);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.register-form-card h3 {
  font-size: 24px;
  margin-bottom: 24px;
}

.register-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 14px;
  font-weight: 500;
}

.form-group input,
.form-group select {
  padding: 14px 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 15px;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
}

/* Partners */
.partners-section {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

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

.partner-tier h4 {
  font-size: 14px;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 20px;
}

.partner-logos {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 24px;
}

.partner-logo {
  background-color: var(--bg-color);
  padding: 16px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-color);
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--white);
  padding: 24px 32px;
  border-radius: 12px;
  margin-bottom: 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}

.faq-item h4 {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--text-color);
}

.faq-item p {
  color: var(--text-light);
  font-size: 15px;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 60px;
}

.contact-info h2 {
  font-size: 32px;
  margin-bottom: 12px;
}

.contact-info > p {
  color: var(--text-light);
  margin-bottom: 32px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 16px;
}

.contact-links h3 {
  font-size: 18px;
  margin-bottom: 20px;
}

.contact-links a {
  display: block;
  color: var(--text-color);
  text-decoration: none;
  padding: 8px 0;
  transition: color 0.2s;
}

.contact-links a:hover {
  color: var(--accent-color);
}

/* Footer */
.footer {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 40px 24px;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 32px;
}

.footer-logo {
  width: 60px;
  height: auto;
}

.footer-brand h4 {
  font-size: 18px;
  margin-bottom: 4px;
}

.footer-brand p {
  font-size: 14px;
  opacity: 0.8;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
}

.footer-bottom p {
  font-size: 14px;
  opacity: 0.7;
  margin-bottom: 4px;
}

/* Responsive */
@media (max-width: 1024px) {
  .pillars-grid,
  .speakers-grid,
  .challenges-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .register-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .header-nav {
    display: none;
  }
  
  .hero-title {
    font-size: 36px;
  }
  
  .hero-tagline {
    font-size: 20px;
  }
  
  .hero-details {
    flex-direction: column;
    gap: 16px;
  }
  
  .countdown {
    gap: 12px;
  }
  
  .countdown-item {
    padding: 16px 20px;
    min-width: 70px;
  }
  
  .countdown-value {
    font-size: 28px;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .pillars-grid,
  .speakers-grid,
  .challenges-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .agenda-day {
    flex-direction: column;
  }
  
  .agenda-date {
    width: 100%;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
}