:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-tertiary: #1e1e2e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent: #00d4ff;
  --accent-secondary: #00ff88;
  --danger: #ff4466;
  --focus-ring: #00d4ff;
  --focus-glow: rgba(0, 212, 255, 0.4);
  --radius-md: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  width: 600px; height: 600px; overflow: hidden;
  background: #000;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}
#app { width: 100%; height: 100%; position: relative; }
.screen { width: 100%; height: 100%; position: absolute; top: 0; left: 0; display: flex; flex-direction: column; }
.screen.hidden { display: none; }
.focusable { transition: all 0.15s ease; border: 2px solid transparent; cursor: pointer; outline: none; }
.focusable:focus { border-color: var(--focus-ring); box-shadow: 0 0 20px var(--focus-glow); }
.hidden { display: none !important; }

/* ---------- HOME ---------- */
.home-inner {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 44px; padding: 40px;
}
.brand { text-align: center; }
.brand-mark {
  width: 96px; height: 96px; margin: 0 auto 18px;
  border-radius: 50%;
  background:
    radial-gradient(circle at center, transparent 18%, var(--accent) 19%, transparent 21%),
    conic-gradient(from 0deg, var(--accent), var(--accent-secondary), #a64dff, var(--accent));
  -webkit-mask: radial-gradient(circle at center, transparent 12px, #000 13px);
          mask: radial-gradient(circle at center, transparent 12px, #000 13px);
  animation: spin 14s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.brand-title {
  font-size: 52px; font-weight: 800; letter-spacing: 10px;
  background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.brand-sub { color: var(--text-secondary); font-size: 17px; margin-top: 6px; letter-spacing: 2px; }

.menu { display: flex; flex-direction: column; gap: 18px; width: 380px; }
.menu-btn {
  height: 88px; border-radius: var(--radius-md);
  background: var(--bg-tertiary); color: var(--text-primary);
  font-size: 22px; font-weight: 600;
  display: flex; align-items: center; gap: 16px; padding: 0 28px;
}
.menu-ico { color: var(--accent); font-size: 26px; width: 30px; text-align: center; }

/* ---------- VIEWER ---------- */
#viewer { background: #000; }
#canvas { position: absolute; top: 0; left: 0; width: 600px; height: 600px; }
.viewer-top {
  position: absolute; top: 0; left: 0; right: 0; height: 44px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 18px; pointer-events: none;
}
.flag {
  font-size: 13px; font-weight: 700; letter-spacing: 2px;
  color: var(--danger); background: rgba(10,10,15,0.7);
  padding: 4px 12px; border-radius: 8px;
}
.hint { font-size: 12px; color: var(--text-muted); letter-spacing: 1px; }

.controls {
  position: absolute; bottom: 0; left: 0; right: 0;
  display: flex; gap: 8px; padding: 12px;
  background: linear-gradient(to top, rgba(10,10,15,0.92), rgba(10,10,15,0.55) 70%, transparent);
}
.chip {
  flex: 1; min-height: 64px; border-radius: var(--radius-md);
  background: var(--bg-tertiary); color: var(--text-primary);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; padding: 6px;
}
.chip-k { font-size: 11px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; }
.chip-v { font-size: 17px; font-weight: 700; }
.chip-act { background: var(--bg-secondary); }
.chip-act .chip-v { color: var(--accent); }

/* ---------- BAR (presets/about) ---------- */
.bar {
  display: flex; align-items: center; gap: 16px;
  padding: 16px 20px; background: var(--bg-primary);
  border-bottom: 1px solid var(--bg-tertiary);
}
.bar h2 { font-size: 24px; font-weight: 700; }
.back-btn {
  height: 48px; padding: 0 20px; border-radius: var(--radius-md);
  background: var(--bg-tertiary); color: var(--text-primary); font-size: 17px; font-weight: 600;
}

/* ---------- PRESETS ---------- */
.preset-grid {
  flex: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  padding: 20px; align-content: start; overflow: hidden;
}
.preset-card {
  height: 150px; border-radius: var(--radius-md);
  background: var(--bg-tertiary); color: var(--text-primary);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
  font-size: 19px; font-weight: 700;
}
.preset-swatch { width: 56px; height: 56px; border-radius: 50%; }
.preset-desc { font-size: 12px; color: var(--text-secondary); font-weight: 500; }

/* ---------- ABOUT ---------- */
.about-body { flex: 1; padding: 28px; display: flex; flex-direction: column; gap: 18px; }
.about-body p { font-size: 19px; line-height: 1.5; }
.about-body .dim { color: var(--text-secondary); font-size: 16px; }
.about-body .menu-btn { width: 340px; margin-top: 8px; }