* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Arial;
  background:
    radial-gradient(circle at 50% 30%, color-mix(in srgb, var(--color-primary) 24%, transparent) 0%, transparent 55%),
    linear-gradient(180deg, color-mix(in srgb, var(--color-bg-main) 92%, #04102b) 0%, var(--color-bg-main) 55%, color-mix(in srgb, var(--color-bg-main) 84%, #000b1f) 100%);
  color: var(--color-text-main);
  position: relative;
  overflow-x: hidden;
}

.app {
  position: relative;
  z-index: 1;
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding-bottom: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  min-height: 108px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-4) var(--space-3);
  background: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border-soft);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.14);
}

.top-left {
  display: grid;
  gap: 6px;
}

.top-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.main {
  flex: 1;
  min-height: 0;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: relative;
}

.app.game-layout .topbar {
  min-height: 72px;
  padding: 8px 12px;
  align-items: center;
}

.app.game-layout .top-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.app.game-layout .main {
  padding: 10px 12px 12px;
  gap: 10px;
}

.bottom {
  position: relative;
  z-index: 15;
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border-soft);
  box-shadow: 0 -8px 14px rgba(0, 0, 0, 0.15);
  padding: var(--space-3);
  display: grid;
  gap: var(--space-3);
}

.bottom.hidden {
  display: none;
}

.surface {
  background: var(--color-bg-surface);
  border: 1px solid color-mix(in srgb, var(--color-border-soft) 40%, transparent);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.title {
  font-size: var(--font-lg);
  font-weight: 700;
  line-height: 1;
}

.muted {
  color: var(--color-text-muted);
}

@media (min-width: 900px) {
  .app {
    max-width: 760px;
    margin: 0 auto;
    border-left: 1px solid var(--color-border-soft);
    border-right: 1px solid var(--color-border-soft);
    background: var(--color-bg-main);
  }
  .main {
    padding: var(--space-5);
  }
}