:root {
  --bg: #0d1117;
  --bg-alt: #11161d;
  --surface: #171d26;
  --border: #262e3a;
  --text: #f2f4f7;
  --text-dim: #9aa4b2;
  --primary: #e0562f;
  --primary-hover: #c8461f;
  --accent: #2fa84f;
  --radius: 14px;
  --max-width: 1160px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: inherit; }

img { max-width: 100%; display: block; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}

.logo {
  font-weight: 800;
  font-size: 1.15rem;
  text-decoration: none;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.logo span { color: var(--primary); }

.nav-links {
  display: flex;
  gap: 28px;
  flex: 1;
  justify-content: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--text); }

.nav-cta { white-space: nowrap; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s, border-color 0.15s;
}

.btn:hover { transform: translateY(-1px); }

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

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

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover { border-color: var(--text-dim); }

/* Hero */
.hero {
  padding: 110px 0 90px;
  background:
    radial-gradient(circle at 15% 20%, rgba(224, 86, 47, 0.18), transparent 45%),
    radial-gradient(circle at 85% 0%, rgba(47, 168, 79, 0.14), transparent 40%);
  text-align: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0 0 14px;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
}

.hero-sub {
  max-width: 620px;
  margin: 0 auto 36px;
  color: var(--text-dim);
  font-size: 1.1rem;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 56px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 56px;
}

.hero-stats div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero-stats strong {
  font-size: 1.8rem;
  letter-spacing: -0.02em;
}

.hero-stats span {
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* Sections */
.section { padding: 90px 0; }
.section.alt { background: var(--bg-alt); }

.section h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}

.section-sub {
  color: var(--text-dim);
  max-width: 680px;
  margin: 0 0 32px;
}

.section-note {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-top: 28px;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-grid p { color: var(--text-dim); }

.about-cards {
  display: grid;
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
}

.card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--text-dim); font-size: 0.92rem; }

/* Highlights */
.highlight-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.highlight {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
}

.highlight-icon { font-size: 1.8rem; display: block; margin-bottom: 14px; }
.highlight h3 { margin: 0 0 8px; font-size: 1.02rem; }
.highlight p { margin: 0; color: var(--text-dim); font-size: 0.9rem; }

/* Exhibitors */
.logo-placeholder-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.logo-slot {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: 10px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 0.82rem;
}

.cta-inline { color: var(--text-dim); }
.cta-inline a { color: var(--primary); font-weight: 600; text-decoration: none; }

/* Schedule */
.schedule-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.schedule-day {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
}

.schedule-day h3 { margin: 0 0 6px; }

.schedule-tag {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
  margin: 0 0 12px;
}

.schedule-day p:last-child { color: var(--text-dim); margin: 0; font-size: 0.92rem; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 56px;
}

.contact-grid > div:first-child p { color: var(--text-dim); }

.contact-details { margin-top: 28px; }
.contact-details p { margin: 0 0 16px; }
.contact-details a { color: var(--primary); text-decoration: none; }

.contact-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: grid;
  gap: 18px;
}

.contact-form label {
  display: grid;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  font-weight: 600;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 11px 14px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 400;
  resize: vertical;
}

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

.form-status {
  margin: 0;
  font-size: 0.88rem;
  min-height: 1.2em;
}

.form-status.success { color: var(--accent); }
.form-status.error { color: var(--primary); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.footer-links a { text-decoration: none; color: var(--text-dim); }
.footer-links a:hover { color: var(--text); }

/* Responsive */
@media (max-width: 900px) {
  .about-grid,
  .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .highlight-grid { grid-template-columns: repeat(2, 1fr); }
  .schedule-grid { grid-template-columns: 1fr; }
  .logo-placeholder-grid { grid-template-columns: repeat(3, 1fr); }
  .hero-stats { gap: 36px; }
}

@media (max-width: 720px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .site-header.open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 20px 24px;
    gap: 18px;
  }
  .site-header.open .nav-cta {
    display: inline-block;
    position: absolute;
    top: 260px;
    left: 24px;
  }
  .highlight-grid { grid-template-columns: 1fr; }
  .logo-placeholder-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 80px 0 60px; }
}