.app { max-width: 960px; margin: 0 auto; padding: 16px; }

/* Hero */
.hero { text-align: center; padding: 48px 16px 28px; }
.hero h1 { font-size: 2.2rem; margin: 0 0 8px; }
.subtitle { color: var(--ink-secondary); font-size: 1.05rem; margin: 0 0 24px; letter-spacing: 0.02em; }
.hero-stats { display: flex; justify-content: center; gap: 32px; flex-wrap: wrap; }
.hero-stat { font-size: 0.85rem; color: var(--ink-secondary); text-align: center; }
.hero-stat strong { font-size: 1.4rem; color: var(--accent); display: block; font-weight: 800; }

/* Tabs */
.tab-nav { display: flex; gap: 4px; margin: 28px 0 20px; border-bottom: 2px solid var(--line); overflow-x: auto; -webkit-overflow-scrolling: touch; }
.tab { background: none; border: none; padding: 12px 20px; font-size: 0.9rem; font-weight: 600;
  color: var(--ink-secondary); cursor: pointer; border-bottom: 3px solid transparent; margin-bottom: -2px;
  transition: color 0.2s, border-color 0.2s; white-space: nowrap; }
.tab:hover { color: var(--ink); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-panel { display: none; animation: fadeInUp 0.3s ease; }
.tab-panel.active { display: block; }
.section-desc { color: var(--ink-secondary); font-size: 0.88rem; margin: 0 0 20px; line-height: 1.6; }

/* Mission Cards */
.mission-grid { display: grid; gap: 16px; }
.mission-card {
  background: var(--card); border-radius: var(--radius-md); padding: 24px;
  box-shadow: var(--shadow-card); cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  border-left: 4px solid var(--accent); position: relative;
}
.mission-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.mission-card:active { transform: scale(0.99); }
.mission-card .mc-emoji { font-size: 2rem; margin-bottom: 8px; display: block; }
.mission-card h3 { margin: 0 0 6px; font-size: 1.1rem; }
.mission-card .mc-desc { font-size: 0.85rem; color: var(--ink-secondary); margin: 0 0 12px; line-height: 1.6; }
.mission-card .mc-meta { display: flex; gap: 12px; font-size: 0.75rem; color: var(--ink-secondary); flex-wrap: wrap; }
.mission-card .mc-meta span { display: flex; align-items: center; gap: 4px; }
.mission-card .mc-progress { margin-top: 12px; }
.mc-bar { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
.mc-bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--warn)); border-radius: 3px; transition: width 0.4s ease; }
.mc-complete { border-left-color: var(--ok); }
.mc-complete h3::after { content: " ✅"; }

/* Module Cards */
.module-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.module-card {
  background: var(--card); border-radius: var(--radius-md); padding: 20px;
  box-shadow: var(--shadow-card); transition: transform 0.2s ease;
}
.module-card:hover { transform: translateY(-2px); }
.module-card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.module-card .mod-desc { font-size: 0.82rem; color: var(--ink-secondary); margin: 0 0 12px; line-height: 1.5; }
.module-card .mod-progress { height: 4px; background: var(--line); border-radius: 2px; margin-bottom: 12px; overflow: hidden; }
.module-card .mod-progress-fill { height: 100%; background: var(--accent); border-radius: 2px; transition: width 0.3s; }
.module-card .tool-list { list-style: none; padding: 0; margin: 0; }
.module-card .tool-list li {
  padding: 7px 0; border-bottom: 1px solid var(--line); font-size: 0.82rem;
  display: flex; justify-content: space-between; align-items: center;
}
.module-card .tool-list li:last-child { border-bottom: none; }
.tool-link { color: var(--accent); text-decoration: none; font-weight: 500; transition: color 0.15s; }
.tool-link:hover { text-decoration: underline; color: var(--accent-hover); }
.tool-used { color: var(--ok); font-size: 0.7rem; background: rgba(52,168,83,0.1); padding: 2px 6px; border-radius: 8px; }

/* Stats */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat-card { background: var(--card); border-radius: var(--radius-md); padding: 20px 16px; text-align: center; box-shadow: var(--shadow-card); transition: transform 0.2s; }
.stat-card:hover { transform: translateY(-2px); }
.stat-num { display: block; font-size: 1.8rem; font-weight: 800; color: var(--accent); }
.stat-label { display: block; font-size: 0.72rem; color: var(--ink-secondary); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.03em; }

/* Bar chart */
.bar-row { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; font-size: 12px; }
.bar-label { min-width: 120px; text-align: right; color: var(--ink-secondary); font-weight: 500; }
.bar-track { flex: 1; background: var(--line); border-radius: 4px; height: 22px; overflow: hidden; }
.bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--warn)); border-radius: 4px;
  display: flex; align-items: center; padding-left: 8px; color: #fff; font-size: 11px; font-weight: 700; transition: width 0.5s ease; }

/* Calendar */
.calendar-area { display: flex; flex-wrap: wrap; gap: 3px; }
.cal-cell { width: 13px; height: 13px; border-radius: 2px; background: var(--line); transition: background 0.2s; }
.cal-cell:hover { outline: 1px solid var(--accent); }
.cal-cell.l1 { background: rgba(199,73,31,0.2); }
.cal-cell.l2 { background: rgba(199,73,31,0.4); }
.cal-cell.l3 { background: rgba(199,73,31,0.65); }
.cal-cell.l4 { background: var(--accent); }

/* Actions */
.actions-card { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.actions-card button { min-width: 160px; }

/* Modal */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.55); z-index: 1000;
  justify-content: center; align-items: center; padding: 20px;
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.modal-overlay.open { display: flex; animation: fadeInUp 0.25s ease; }
.modal { max-width: 620px; width: 100%; max-height: 85vh; overflow-y: auto; padding: 32px; position: relative; }
.modal-close { position: absolute; top: 12px; right: 12px; background: none; border: none; font-size: 1.3rem;
  cursor: pointer; color: var(--ink-secondary); transition: color 0.15s; width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center; border-radius: 50%; }
.modal-close:hover { background: var(--line); color: var(--ink); }
.modal-header { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.modal h2 { margin: 0 0 4px; flex: 1; }
.modal-badge { font-size: 0.7rem; padding: 3px 10px; border-radius: 12px; background: var(--accent); color: #fff; font-weight: 600; white-space: nowrap; }
.modal p { color: var(--ink-secondary); font-size: 0.88rem; line-height: 1.6; margin: 8px 0 0; }
.mission-steps { margin: 20px 0; }
.step-item { display: flex; gap: 12px; padding: 14px; margin-bottom: 8px; border-radius: var(--radius-sm);
  background: rgba(199,73,31,0.06); font-size: 0.85rem; align-items: flex-start; transition: background 0.2s; }
.step-item:hover { background: rgba(199,73,31,0.1); }
.step-num { background: var(--accent); color: #fff; border-radius: 50%; width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center; font-size: 0.8rem; font-weight: 700; flex-shrink: 0; }
.step-done .step-num { background: var(--ok); }
.step-done { opacity: 0.7; }
.step-info { flex: 1; }
.step-tool { font-weight: 700; color: var(--accent); font-size: 0.9rem; }
.step-action { color: var(--ink-secondary); display: block; margin-top: 3px; line-height: 1.5; }
.modal-actions { display: flex; gap: 8px; margin-top: 20px; }
.modal-actions button { flex: 1; }

.card { background: var(--card); border-radius: var(--radius-md); padding: 20px; margin-bottom: 16px; box-shadow: var(--shadow-card); }
.card h3 { margin: 0 0 14px; font-size: 1.05rem; }
.empty-state { text-align: center; padding: 40px; color: var(--ink-secondary); font-size: 0.9rem; }
.footer { text-align: center; padding: 32px 16px; font-size: 0.78rem; color: var(--ink-secondary); }
.footer a { color: var(--accent); }

/* Mobile */
@media (max-width: 600px) {
  .hero h1 { font-size: 1.6rem; }
  .hero-stats { gap: 16px; }
  .hero-stat strong { font-size: 1.1rem; }
  .tab { padding: 10px 14px; font-size: 0.82rem; }
  .mission-card { padding: 18px; }
  .mission-card .mc-meta { gap: 8px; }
  .module-grid { grid-template-columns: 1fr; }
  .modal { padding: 20px; margin: 8px; }
  .modal-actions { flex-direction: column; }
  .actions-card { flex-direction: column; }
  .actions-card button { min-width: auto; }
}

/* === 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; }