:root {
  --bg: #07111f;
  --bg-2: #0d1c34;

  --panel: rgba(11, 22, 46, 0.88);
  --panel-strong: rgba(16, 29, 60, 0.95);

  --line: rgba(120, 160, 255, 0.18);

  --text: #f8fbff;
  --muted: #9fb0d1;

  --primary: #4f46e5;
  --secondary: #7c3aed;

  --success: #22c55e;
  --warning: #ffd54a;
  --danger: #ef4444;

  --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);

  --radius-lg: 22px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family:
    Inter,
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    Arial,
    sans-serif;
  background:
    radial-gradient(
      circle at top left,
      rgba(79, 70, 229, 0.28),
      transparent 25%
    ),
    radial-gradient(
      circle at bottom right,
      rgba(37, 99, 235, 0.22),
      transparent 30%
    ),
    linear-gradient(160deg, var(--bg), var(--bg-2));
}

.site-header,
.game-shell,
.homepage-shell,
.site-footer {
  width: min(1280px, calc(100% - 32px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 24px 0 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.site-logo {
  height: 64px;
  width: auto;
  display: block;
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.brand p,
.tagline {
  margin: 4px 0 0;
  color: var(--muted);
}

.top-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nav-link,
.primary-btn,
.secondary-btn {
  text-decoration: none;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-weight: 800;
  color: white;
  cursor: pointer;
  transition:
    transform 0.18s ease,
    filter 0.18s ease,
    background 0.18s ease;
}

.nav-link,
.secondary-btn {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.06);
}

.primary-btn {
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: var(--shadow);
}

.nav-link:hover,
.primary-btn:hover,
.secondary-btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.06);
}

.secondary-btn:disabled,
.primary-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  filter: none;
}

.select-control {
  border-radius: var(--radius-md);
  padding: 12px 14px;
  color: white;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.06);
  outline: none;
}

.topbar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 18px;
}

.stat-card,
.board-panel,
.side-panel .info-card,
.card,
.about-card,
.game-card,
.featured-card,
.visual-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.stat-card {
  padding: 16px;
}

.stat-label {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.stat-value {
  font-size: 1.55rem;
  font-weight: 900;
}

.stat-value.small {
  font-size: 1rem;
  line-height: 1.5;
}

.board-panel,
.card,
.about-card,
.game-card,
.featured-card,
.visual-card,
.side-panel .info-card {
  padding: 18px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  margin-bottom: 14px;
}

.panel-header h2 {
  margin: 0 0 6px;
}

.panel-header p {
  margin: 0;
  color: var(--muted);
}

.panel-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.content-grid {
  display: grid;
  gap: 18px;
}

.feedback {
  font-weight: 700;
  line-height: 1.6;
  color: var(--muted);
}

.feedback.success {
  color: var(--success);
}

.feedback.warning {
  color: var(--warning);
}

.feedback.danger {
  color: var(--danger);
}

.site-footer {
  padding: 24px 0 32px;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 780px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .panel-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-logo {
    height: 52px;
  }
}

@media (max-width: 560px) {
  .topbar {
    grid-template-columns: 1fr;
  }
}