:root {
  --primary: #1a3a5c;
  --accent: #e07b39;
  --light: #f8f5f0;
  --text: #2c2c2c;
  --muted: #6b7280;
  --white: #ffffff;
  --border: #e5e7eb;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--white);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* Banner */
.banner {
  text-align: center;
  padding: 2rem 2rem 0;
  max-width: 900px;
  margin: 0 auto;
}

.banner img {
  max-width: 100%;
  height: auto;
  display: inline-block;
}

/* Hero */
.hero {
  background: var(--primary);
  color: var(--white);
  text-align: center;
  padding: 4rem 2rem 3rem;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.hero .subtitle {
  font-size: 1.15rem;
  font-weight: 300;
  opacity: 0.9;
  margin-bottom: 0.5rem;
}

.hero .date-location {
  font-size: 1rem;
  margin-bottom: 2rem;
  opacity: 0.85;
}

.hero .cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255, 255, 255, 0.6);
}

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

/* Sections */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 3.5rem 0;
}

section:nth-child(even) {
  background: var(--light);
}

section h2 {
  font-size: 1.8rem;
  color: var(--primary);
  margin-bottom: 1.5rem;
  text-align: center;
}

section h3 {
  font-size: 1.2rem;
  color: var(--primary);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

/* About */
.about-text {
  font-size: 1.05rem;
  text-align: center;
  max-width: 750px;
  margin: 0 auto;
  color: var(--muted);
}

/* Schedule */
.schedule-day {
  margin-bottom: 2rem;
}

.schedule-day h3 {
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.4rem;
  display: inline-block;
}

.schedule-item {
  display: flex;
  gap: 1.5rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
}

.schedule-item:last-child {
  border-bottom: none;
}

.schedule-time {
  font-weight: 600;
  color: var(--accent);
  min-width: 120px;
  flex-shrink: 0;
}

.schedule-desc {
  flex: 1;
}

/* Organizers */
.organizers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 1.5rem;
}

.organizer {
  text-align: center;
}

.organizer-photo {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 0.75rem;
  display: block;
}

.organizer h4 {
  font-size: 1.05rem;
  margin-bottom: 0.2rem;
}

.organizer p {
  font-size: 0.9rem;
  color: var(--muted);
}

/* Build section */
.build-card {
  background: var(--white);
  border: 2px solid var(--accent);
  border-radius: 10px;
  padding: 2rem;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.build-card h3 {
  margin-top: 0;
  font-size: 1.3rem;
}

.build-card p {
  color: var(--muted);
  margin-bottom: 1.5rem;
}

/* Footer */
footer {
  background: var(--primary);
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
  padding: 2rem;
  font-size: 0.9rem;
}

footer a {
  color: var(--white);
}

/* Responsive */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 1.7rem;
  }

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

  .schedule-item {
    flex-direction: column;
    gap: 0.3rem;
  }

  .schedule-time {
    min-width: unset;
  }

  .organizers-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .organizer-photo {
    width: 80px;
    height: 80px;
  }
}