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

:root {
  --go-blue: #00acd7;
  --go-dark: #1a1a2e;
  --go-gray: #f5f5f5;
  --text: #333;
  --text-light: #666;
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  background: var(--go-dark);
  padding: 18px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--go-blue);
  letter-spacing: 0.02em;
}

.header__nav {
  display: flex;
  gap: 32px;
}

.header__nav a {
  color: #fff;
  text-decoration: none;
  font-size: 0.95rem;
  opacity: 0.85;
  transition: opacity 0.2s;
}

.header__nav a:hover {
  opacity: 1;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--go-dark) 0%, #16213e 100%);
  color: #fff;
  text-align: center;
  padding: 100px 24px 80px;
}

.hero__tag {
  display: inline-block;
  background: var(--go-blue);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero__title span {
  color: var(--go-blue);
}

.hero__subtitle {
  font-size: 1.15rem;
  opacity: 0.75;
  max-width: 560px;
  margin: 0 auto 40px;
}

.hero__meta {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero__meta-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.hero__meta-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.55;
}

.hero__meta-value {
  font-size: 1.05rem;
  font-weight: 600;
}

.hero__cta {
  display: inline-block;
  background: var(--go-blue);
  color: #fff;
  text-decoration: none;
  padding: 14px 40px;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.15s;
}

.hero__cta:hover {
  background: #009ab8;
  transform: translateY(-1px);
}

/* About */
.about {
  padding: 80px 0;
  background: #fff;
}

.section-title {
  font-size: 1.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--go-dark);
}

.section-lead {
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 680px;
  margin-bottom: 48px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.card {
  background: var(--go-gray);
  border-radius: 8px;
  padding: 28px 24px;
}

.card__icon {
  font-size: 2rem;
  margin-bottom: 14px;
}

.card__title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--go-dark);
}

.card__text {
  font-size: 0.9rem;
  color: var(--text-light);
}

/* Speakers placeholder */
.speakers {
  padding: 80px 0;
  background: var(--go-gray);
}

.speakers-placeholder {
  border: 2px dashed #ccc;
  border-radius: 8px;
  padding: 60px 24px;
  text-align: center;
  color: var(--text-light);
  font-size: 1rem;
}

/* Venue */
.venue {
  padding: 80px 0;
  background: #fff;
}

.venue__info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.venue__address {
  font-size: 1.05rem;
  color: var(--text-light);
  margin-bottom: 16px;
}

.venue__address strong {
  display: block;
  font-size: 1.25rem;
  color: var(--go-dark);
  margin-bottom: 6px;
}

.venue__map {
  background: #e8e8e8;
  border-radius: 8px;
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 0.9rem;
}

/* Footer */
.footer {
  background: var(--go-dark);
  color: rgba(255,255,255,0.5);
  text-align: center;
  padding: 28px 0;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 640px) {
  .hero {
    padding: 70px 24px 60px;
  }

  .hero__meta {
    gap: 24px;
  }

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

  .header__nav {
    gap: 16px;
  }
}