.app-shell {
  width: min(100%, 860px);
  margin: 0 auto;
  padding: calc(30px + env(safe-area-inset-top)) 20px calc(120px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Header & Meta */
.hero-header {
  text-align: center;
  margin-bottom: 16px;
}

.hero-header h1 {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
}

.hero-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Route View Container */
.route-view {
  position: relative;
  width: 100%;
}

.step-container {
  display: none;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  flex-direction: column;
  gap: 24px;
}

/* The router class will toggle these states */
.step-container.active {
  opacity: 1;
  transform: translateY(0);
}

/* Panel Layouts */
.panel {
  background: var(--surface-base);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-panel);
  position: relative;
  overflow: hidden;
}

.panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}

.eyebrow {
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 8px;
}

.panel-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Responsive Grids */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

.grid-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.step-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  gap: 16px;
}

@media (max-width: 600px) {
  .app-shell {
    padding: 20px 16px;
  }
  .panel {
    padding: 20px 16px;
  }
  .step-actions {
    flex-direction: column-reverse;
  }
  .step-actions button {
    width: 100%;
  }
}