/* ==========================================================================
   AI開発アシスタント - 画面レイアウト & 進行制御 (screens.css)
   ========================================================================== */

/* Header & Progress Bar */
.app-header {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.header-brand {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.brand-title {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  line-height: 1.4;
}

.title-part {
  display: inline-block;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-sans);
  background: rgba(37, 99, 235, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.4);
  color: #93c5fd;
  white-space: nowrap;
  flex-shrink: 0;
}

.progress-track {
  width: 100%;
  height: 4px;
  background: var(--bg-inset);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 8px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-emerald));
  width: 11%;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.step-indicator {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 6px;
}

/* Screen Visibility & Transitions */
.screen {
  display: none;
  animation: fadeIn 0.2s ease-out;
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Footer */
.app-footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
}