/* layout — screen, HUD, mission, play area. */
.screen {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* HUD */
.hud {
  display: flex;
  align-items: center;
  gap: var(--gap);
  padding: 12px 20px;
  background: var(--c-surface);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}
.hud__back {
  border: none;
  background: var(--c-bg);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--c-ink);
}
.hud__brand { font-weight: 700; color: var(--c-primary); }
.hud__stats { margin-left: auto; display: flex; gap: 14px; }
.hud__stat {
  display: flex; align-items: center; gap: 6px;
  background: var(--c-bg);
  padding: 6px 14px;
  border-radius: 999px;
  font-weight: 700;
}
.hud__icon { font-size: 1.1rem; }

/* Menu */
.menu-body { padding: 24px 20px 48px; max-width: 960px; margin: 0 auto; width: 100%; }
.menu-intro { text-align: center; margin-bottom: 28px; }
.menu-title { font-size: 2rem; }
.menu-subtitle { color: var(--c-ink-soft); margin-top: 6px; }
.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--gap);
}
.menu-footer { margin-top: 28px; text-align: center; }

/* Mission */
.mission {
  padding: 18px 20px;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
  text-align: center;
}
.mission__chapter {
  display: inline-block;
  background: var(--c-accent);
  color: var(--c-ink);
  padding: 2px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
}
.mission__title { font-size: 1.5rem; margin-top: 6px; }
.mission__instruction { color: var(--c-ink-soft); margin: 10px 0 14px; }

/* Play area */
.play-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  gap: 16px;
}
.feedback { min-height: 1.5em; color: var(--c-primary); font-weight: 600; }

.keyboard-wrap {
  padding: 16px 12px 28px;
  display: flex;
  justify-content: center;
}

@media (max-width: 560px) {
  .mission__title { font-size: 1.25rem; }
  .hud__brand { display: none; }
}