:root{--bg:#171b2a;--card:#1e253a;--line:#35405d;--ink:#eaf0ff}
*{box-sizing:border-box}
body{margin:0;color:var(--ink);font-family:"Source Sans 3","Noto Sans SC",sans-serif;background:var(--bg)}
.app{max-width:980px;margin:0 auto;padding:16px}
.hero,.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:12px}
.hero h1{margin:0 0 8px}
button{border:0;border-radius:999px;padding:8px 14px;color:#fff;cursor:pointer;background:linear-gradient(135deg,#d06f2f,#a4511f);font:inherit}
.arena{position:relative;height:300px;border:1px solid #3a496d;border-radius:12px;background:#141a2b;overflow:hidden}
.bubble{position:absolute;left:100%;padding:6px 10px;border-radius:999px;background:#c84b47;color:#fff;white-space:nowrap}
input{width:100%;border:1px solid #43527a;border-radius:10px;padding:10px;background:#0f1524;color:#fff;font:inherit}


/* === CSS Professor Upgrade (Round 20) === */

/* Card system */
.card, [class*="card"], section, .panel, .container > div { transition: transform 0.2s ease, box-shadow 0.2s ease; }
.card:hover, [class*="card"]:hover { transform: translateY(-2px); }

/* Button polish */
button, .btn, [type="submit"], [type="button"] {
  transition: all 0.2s ease;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
button:hover, .btn:hover, [type="submit"]:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
button:active, .btn:active { transform: scale(0.98); }

/* Input polish */
input, textarea, select {
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
input:focus, textarea:focus, select:focus {
  box-shadow: 0 0 0 3px rgba(199,73,31,0.15);
}

/* Link hover */
a { transition: color 0.15s ease; }

/* Focus outline */
:focus-visible { outline: 2px solid var(--accent, #c7491f); outline-offset: 2px; }

/* Mobile responsive */
@media (max-width: 600px) {
  body { padding: 8px; }
  .app, main, .container { padding: 12px; }
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.2rem; }
  button, .btn { width: 100%; }
}

/* === CSS Professor Animation Upgrade (Round 22) === */

/* Page entrance */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.app, main, body > .container { animation: fadeInUp 0.4s ease-out; }

/* Staggered card entrance */
@keyframes cardReveal {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.card, [class*="card"], .mission-card, .module-card, .stat-card {
  animation: cardReveal 0.35s ease-out both;
}
.card:nth-child(2), [class*="card"]:nth-child(2) { animation-delay: 0.05s; }
.card:nth-child(3), [class*="card"]:nth-child(3) { animation-delay: 0.1s; }
.card:nth-child(4), [class*="card"]:nth-child(4) { animation-delay: 0.15s; }
.card:nth-child(5), [class*="card"]:nth-child(5) { animation-delay: 0.2s; }

/* Subtle pulse for primary buttons */
@keyframes btnPulse {
  0%, 100% { box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
  50% { box-shadow: 0 2px 12px rgba(199,73,31,0.25); }
}
button[id*="Btn"]:not(:disabled), .btn-primary {
  animation: btnPulse 3s ease-in-out infinite;
}
button:disabled { animation: none; opacity: 0.6; }

/* Smooth height transitions for collapsible sections */
details { transition: all 0.2s ease; }
details[open] summary { margin-bottom: 8px; }

/* Tooltip fade */
[title] { position: relative; }

/* Progress bar animation */
@keyframes progressFill {
  from { width: 0; }
}
.mc-bar-fill, .mod-progress-fill, .bar-fill, progress::-webkit-progress-value {
  animation: progressFill 0.6s ease-out;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* === Loading & Feedback States === */
@keyframes spin { to { transform: rotate(360deg); } }
.btn-loading { position: relative; pointer-events: none; opacity: 0.7; }
.btn-loading::after {
  content: '';
  position: absolute;
  right: 8px; top: 50%;
  width: 14px; height: 14px;
  margin-top: -7px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
.toast-msg {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: #333; color: #fff; padding: 10px 20px; border-radius: 8px;
  font-size: 0.9rem; z-index: 9999; opacity: 0;
  transition: opacity 0.3s ease;
}
.toast-msg.show { opacity: 1; }