:root {
  /* Design System Colors */
  --primary-color: #00A0E9;
  /* Brand Blue */
  --secondary-color: #FF6B6B;
  /* Secondary */
  --accent-color: #FF3B30;
  /* Red Accent */
  --text-primary: #000000;
  --text-secondary: #4A4A4A;
  --bg-color: #FFFFFF;
  --surface-color: #F5F7FA;

  /* Spacing */
  --page-padding: 12px;
  --section-gap: 80px;
  --card-padding: 20px;

  /* Dimensions & Effects */
  --container-width: 900px;
  --border-radius: 6px;
  --header-height: 70px;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.05);
  /* Minimal shadow */
}

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

body {
  font-family: 'Lato', 'Noto Sans JP', sans-serif;
  /* Humanist & Gothic */
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.7;
  /* 1.6 - 1.8 */
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 2rem;
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  position: relative;
  display: inline-block;
}

/* Section Header Style: Short & Bold */
h2::after {
  content: '';
  display: block;
  width: 40px;
  height: 4px;
  background-color: var(--primary-color);
  margin-top: 8px;
  border-radius: 2px;
}

h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 700;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.8;
}

/* Layout */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--page-padding);
}

/* Navbar */
header {
  background-color: #fff;
  border-bottom: 1px solid #f0f0f0;
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--primary-color);
  letter-spacing: 0.05em;
}

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

.nav-links a {
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 0.95rem;
}

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

/* Footer */
footer {
  background-color: var(--surface-color);
  color: var(--text-secondary);
  padding: 40px 0;
  margin-top: auto;
  text-align: center;
  font-size: 0.9rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  background-color: var(--primary-color);
  color: #fff !important;
  border-radius: 30px;
  font-weight: 700;
  transition: transform 0.2s, background-color 0.2s;
  box-shadow: 0 2px 4px rgba(0, 160, 233, 0.2);
}

.btn:hover {
  background-color: #0088c7;
  transform: translateY(-2px);
  color: #fff;
}

.btn-large {
  font-size: 1.1rem;
  padding: 16px 48px;
}

/* Sections */
.section {
  margin-bottom: var(--section-gap);
}

.section-divider {
  margin: var(--section-gap) 0;
  border: 0;
  border-top: 1px solid #f0f0f0;
}

/* Hero Section */
.hero-wrapper {
  margin-bottom: 0;
  background-color: var(--surface-color);
}

.hero-image-container {
  display: grid;
  grid-template-columns: 1fr;
}

.hero-image {
  grid-column: 1;
  grid-row: 1;
  width: 100%;
  max-height: 480px;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.hero-image.active {
  opacity: 1;
  z-index: 1;
}

.hero-content {
  background-color: var(--surface-color);
  padding: 60px var(--page-padding);
  text-align: center;
  border-bottom: 1px solid #f0f0f0;
}

.hero-tagline {
  font-size: 1.4rem;
  color: var(--text-secondary);
  font-weight: 700;
}

.event-info-grid {
  display: flex;
  justify-content: center;
  gap: 60px;
  margin: 60px 0;
  text-align: left;
}

.event-info-item h3 {
  font-size: 0.95rem;
  color: var(--primary-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.event-info-item p {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 60px;
}

/* Cards (Exhibitors) */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.category-header {
  margin-top: 80px;
}

.card {
  background: var(--bg-color);
  border: 1px solid #eee;
  /* Very subtle border */
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
}

.card-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background-color: var(--surface-color);
}

.card-body {
  padding: var(--card-padding);
  flex-grow: 1;
}

.card-title {
  font-weight: 700;
  margin-bottom: 8px;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.card-disabled {
  opacity: 0.7;
  cursor: default;
}

/* FAQ */
.faq-item {
  background: var(--bg-color);
  border: 1px solid #eee;
  border-radius: var(--border-radius);
  padding: 24px;
  margin-bottom: 16px;
}

.faq-q {
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 12px;
  font-size: 1.1rem;
}

.faq-a {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* Navigation Anchors (Exhibitors list) */
.anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
  justify-content: center;
}

.anchor-nav a {
  padding: 8px 16px;
  background: var(--surface-color);
  border-radius: 4px;
  /* Matches card 4-8px rule */
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: normal;
  transition: all 0.2s;
}

.anchor-nav a:hover {
  background: var(--primary-color);
  color: #fff;
}

/* Utility */
.details-list li {
  margin-bottom: 8px;
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .event-info-grid {
    flex-direction: column;
    gap: 32px;
    align-items: center;
    text-align: center;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn-large {
    width: 100%;
    max-width: 300px;
  }
}