/* ============================================================
   base.css
   Variabel CSS, reset global, tipografi, layout utama,
   latar belakang bintang (starfield), dan screen transitions.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Exo+2:wght@300;400;600;700&display=swap');

/* ── Design Tokens ── */
:root {
  --bg:        #0a0e1a;
  --bg2:       #0f1629;
  --panel:     #111827;
  --border:    #1e3a5f;
  --accent:    #00d4ff;
  --accent2:   #ff6b35;
  --accent3:   #7c3aed;
  --green:     #00ff9d;
  --red:       #ff3366;
  --yellow:    #ffd600;
  --text:      #e2e8f0;
  --muted:     #64748b;
  --cat-a:     #ff6b35;
  --cat-b:     #00d4ff;
  --cat-c:     #7c3aed;
  --radius:    12px;
  --glow:      0 0 20px rgba(0,212,255,0.3);
}

/* ── Reset ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Body ── */
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Exo 2', sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Starfield Background ── */
#stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse at 20% 50%, #0d1b3e 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, #1a0a2e 0%, transparent 50%),
    var(--bg);
}

#stars::before,
#stars::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,.6) 0%, transparent 0%),
    radial-gradient(1px 1px at 30% 60%, rgba(255,255,255,.4) 0%, transparent 0%),
    radial-gradient(1px 1px at 50% 10%, rgba(255,255,255,.7) 0%, transparent 0%),
    radial-gradient(1px 1px at 70% 80%, rgba(255,255,255,.5) 0%, transparent 0%),
    radial-gradient(1px 1px at 90% 40%, rgba(255,255,255,.6) 0%, transparent 0%),
    radial-gradient(1px 1px at 15% 75%, rgba(255,255,255,.4) 0%, transparent 0%),
    radial-gradient(1px 1px at 45% 45%, rgba(255,255,255,.5) 0%, transparent 0%),
    radial-gradient(1px 1px at 80% 65%, rgba(255,255,255,.7) 0%, transparent 0%),
    radial-gradient(1px 1px at 25% 30%, rgba(255,255,255,.3) 0%, transparent 0%),
    radial-gradient(1px 1px at 60% 90%, rgba(255,255,255,.5) 0%, transparent 0%);
  background-size: 400px 400px;
  animation: twinkle 4s ease-in-out infinite alternate;
}

#stars::after {
  background-size: 300px 300px;
  animation-delay: 2s;
  animation-duration: 5s;
}

@keyframes twinkle {
  from { opacity: .4; }
  to   { opacity: 1; }
}

/* ── App Wrapper ── */
#app {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* ── Screen Transitions ── */
.screen {
  display: none;
  width: 100%;
  max-width: 820px;
}

.screen.active {
  display: block;
  animation: fadeIn .4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .logo-title { font-size: 1.8rem; }
  .cat-grid   { grid-template-columns: 1fr; }
  .stat-grid,
  .eval-grid  { grid-template-columns: 1fr; }
  .rules-box  { flex-direction: column; align-items: flex-start; }
}