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

:root {
  --bg: #f4f4f8;
  --surface: #ffffff;
  --surface-alt: #f0f1f7;
  --text: #222222;
  --muted: #666666;
  --primary: #2c2c54;
  --primary-light: #4d4d86;
  --border: #dddded;
  --shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
  --radius: 14px;
}

body {
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

.hidden {
  display: none !important;
}

.container {
  width: min(1200px, 92%);
  margin: 0 auto;
}

.site-header {
  background: var(--primary);
  color: white;
  padding: 2rem 0;
}

.site-header h1 {
  margin-bottom: 0.4rem;
}

.subtitle {
  color: #dedfff;
}

.main-nav {
  background: #1f1f3b;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1rem 0;
  align-items: center;
}

.nav-links a,
.nav-dropdown-toggle {
  color: white;
  text-decoration: none;
  padding: 0.65rem 1rem;
  border-radius: 999px;
  background: transparent;
  border: 0;
  font: inherit;
  transition: background 0.2s ease;
  cursor: pointer;
}

.nav-links a:hover,
.nav-links a.active,
.nav-dropdown:hover .nav-dropdown-toggle,
.nav-dropdown.active .nav-dropdown-toggle,
.nav-dropdown-toggle:focus-visible {
  background: rgba(255, 255, 255, 0.12);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 0.35rem);
  left: 0;
  z-index: 20;
  min-width: 180px;
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.45rem;
  background: #1f1f3b;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.2);
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.is-open .nav-dropdown-menu {
  display: flex;
}

.nav-dropdown-menu a {
  border-radius: 10px;
  white-space: nowrap;
}

.page-content {
  padding: 2rem 0 3rem;
}

.welcome-section,
.filters-section,
.rules-section,
.expansion-card,
.content-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.welcome-section h2,
.filters-section h2,
.rules-section h2,
.expansion-card h2,
.expansion-card h3,
.content-card h2,
.content-card h3 {
  color: var(--primary);
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.badge {
  display: inline-block;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.85rem;
}

.empty-message {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  color: var(--muted);
}

@media (max-width: 700px) {
  .nav-dropdown,
  .nav-dropdown-menu {
    position: static;
  }

  .nav-dropdown {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
  }

  .nav-dropdown-menu {
    display: none;
    margin-left: 0.75rem;
    padding: 0;
    border: 0;
    box-shadow: none;
    background: transparent;
  }

  .nav-dropdown:hover .nav-dropdown-menu {
    display: none;
  }

  .nav-dropdown.is-open .nav-dropdown-menu {
    display: flex;
  }

  .nav-dropdown-menu a {
    padding-block: 0.5rem;
    background: rgba(255, 255, 255, 0.06);
  }
}