:root {
  --bg-primary: #000000; /* 純黒 = 加算式ディスプレイで透明 */
  --bg-secondary: #0a0a0f;
  --bg-tertiary: #14141f;
  --bg-card: #1a1a2e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent-primary: #4dd0ff;
  --success: #00ff88;
  --danger: #ff4466;
  --focus-ring: #4dd0ff;
  --focus-glow: rgba(77, 208, 255, 0.4);
  --pad-up: #4dd0ff;
  --pad-right: #ffb454;
  --pad-down: #00ff88;
  --pad-left: #ff4da6;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  width: 600px;
  height: 600px;
  overflow: hidden;
}

#app { width: 100%; height: 100%; position: relative; }

/* --- Screens --- */
.screen {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 0;
  left: 0;
}
.screen.hidden { display: none; }

/* --- Header --- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--bg-secondary);
  gap: 12px;
  flex-shrink: 0;
}
.header h1 { font-size: 22px; font-weight: 600; }
.header-meta { font-size: 14px; color: var(--text-secondary); }

/* --- Content Area --- */
.content {
  flex: 1;
  padding: 16px 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* --- Focus States --- */
.focusable {
  transition: all 0.15s ease;
  border: 2px solid transparent;
  cursor: pointer;
  min-height: 44px;
}
.focusable:focus {
  outline: none;
  border-color: var(--focus-ring);
  box-shadow: 0 0 20px var(--focus-glow);
}

/* --- Navigation Bar --- */
.nav-bar {
  display: flex;
  gap: 8px;
  padding: 12px 20px;
  background: var(--bg-secondary);
  flex-shrink: 0;
}
.nav-item {
  flex: 1;
  padding: 14px 16px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.nav-item:focus { background: var(--bg-card); }
.nav-item.primary { background: var(--accent-primary); color: #0a0a0f; }
.nav-item.primary:focus { background: #8ae2ff; }

/* --- Intro (home) --- */
.intro {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px 0 8px;
  text-align: center;
}
.intro-icon { font-size: 56px; }
.intro-text { font-size: 16px; color: var(--text-secondary); line-height: 1.6; }

/* --- Mini cards --- */
.data-grid { display: flex; gap: 12px; }
.mini-card {
  flex: 1;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  text-align: center;
}
.mini-label { font-size: 12px; color: var(--text-muted); margin-bottom: 6px; }
.mini-value { font-size: 22px; font-weight: 700; }

/* --- Game pads --- */
.game-content { align-items: center; justify-content: center; gap: 8px; }
.pad-grid {
  display: grid;
  grid-template-columns: 128px 128px 128px;
  grid-template-rows: 128px 128px 128px;
  gap: 12px;
  grid-template-areas:
    ". up ."
    "left center right"
    ". down .";
}
.pad-up { grid-area: up; }
.pad-left { grid-area: left; }
.pad-right { grid-area: right; }
.pad-down { grid-area: down; }
.pad-center {
  grid-area: center;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: 50%;
  font-size: 40px;
  font-weight: 700;
  color: var(--text-primary);
  border: 2px solid var(--bg-card);
  transition: border-color 0.2s ease, color 0.2s ease;
}
.pad-center.ok { border-color: var(--success); color: var(--success); }
.pad-center.ng { border-color: var(--danger); color: var(--danger); }

.pad {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  border: 2px solid var(--bg-card);
  transition: background 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}
.pad-arrow { font-size: 44px; opacity: 0.85; }
.pad-up .pad-arrow { color: var(--pad-up); }
.pad-right .pad-arrow { color: var(--pad-right); }
.pad-down .pad-arrow { color: var(--pad-down); }
.pad-left .pad-arrow { color: var(--pad-left); }

.pad.lit { background: var(--bg-card); }
.pad-up.lit { border-color: var(--pad-up); box-shadow: 0 0 32px rgba(77, 208, 255, 0.6); }
.pad-right.lit { border-color: var(--pad-right); box-shadow: 0 0 32px rgba(255, 180, 84, 0.6); }
.pad-down.lit { border-color: var(--pad-down); box-shadow: 0 0 32px rgba(0, 255, 136, 0.6); }
.pad-left.lit { border-color: var(--pad-left); box-shadow: 0 0 32px rgba(255, 77, 166, 0.6); }
.pad.miss { border-color: var(--danger); box-shadow: 0 0 32px rgba(255, 68, 102, 0.6); }

.game-hint { font-size: 13px; color: var(--text-muted); }

/* --- Result --- */
.result-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 0 8px;
  text-align: center;
}
.result-label { font-size: 14px; color: var(--text-secondary); }
.result-level { font-size: 72px; font-weight: 800; line-height: 1.1; color: var(--accent-primary); }
.result-sub { font-size: 15px; color: var(--text-secondary); }
#result-new-best { color: var(--success); font-weight: 700; }