:root {
  /* Design Tokens - "Prism Play" / Tactile Studio */
  --background: #f6faff;
  --surface: #f6faff;
  --surface-container-low: #f0f4fa;
  --surface-container: #eaeef4;
  --surface-container-highest: #dee3e9;
  --surface-container-lowest: #ffffff;
  
  --primary: #006591;
  --primary-container: #0ea5e9;
  --on-primary: #ffffff;
  
  --secondary-container: #fdd34d;
  --tertiary-container: #f06eb2;
  --tertiary: #a43073;

  --on-surface: #171c20;
  --on-surface-variant: #3e4850;

  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 20px;
  --spacing-6: 24px;
  --spacing-8: 32px;
  --spacing-10: 40px;
  --spacing-12: 48px;

  --radius-md: 1.5rem;
  --radius-lg: 2rem;
  --radius-xl: 3rem;
  --radius-full: 9999px;

  --font-family: 'Plus Jakarta Sans', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.lazy-sentinel {
  height: 1px;
  width: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--background);
  color: var(--on-surface);
  -webkit-font-smoothing: antialiased;
  padding-bottom: 80px; /* space for bottom nav */
}

/* Header */
.header {
  padding: var(--spacing-8) var(--spacing-6) var(--spacing-6);
}

.display-title {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--on-surface);
}

/* Views */
.view {
  display: none;
  animation: fadeIn 0.3s ease-out;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Applications List */
.list-container {
  padding: 0 var(--spacing-6) var(--spacing-6);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.app-card {
  background-color: var(--surface-container-lowest);
  padding: var(--spacing-5);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  /* The Layering Principle */
  box-shadow: 0 12px 40px rgba(23, 28, 32, 0.04);
  /* Asymmetry styling appled via JS (alternating border radii) */
}

.app-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.app-icon {
  width: 72px;
  height: 72px;
  border-radius: 1.25rem;
  object-fit: cover;
  box-shadow: 0 4px 12px rgba(23, 28, 32, 0.06);
}

.app-info {
  flex: 1;
}

.app-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-1);
}

.app-desc {
  font-size: 0.95rem;
  color: var(--on-surface-variant);
  line-height: 1.4;
}

/* Button */
.btn-primary {
  display: inline-block;
  text-align: center;
  width: 100%;
  background: linear-gradient(135deg, var(--primary), var(--primary-container));
  color: var(--on-primary);
  padding: var(--spacing-4) var(--spacing-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:hover {
  box-shadow: 0 4px 16px rgba(14, 165, 233, 0.3);
}

/* Images Grid */
.grid-container {
  padding: 0 var(--spacing-6) var(--spacing-6);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-4);
}

.image-card {
  background-color: var(--surface-container-lowest);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(23, 28, 32, 0.04);
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.image-card:active {
  transform: scale(0.95);
}

.image-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.image-card-title {
  padding: var(--spacing-3) var(--spacing-3);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
}

/* Bottom Navigation */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(135deg, #4f46e5 0%, #db2777 100%);
  display: flex;
  justify-content: space-around;
  align-items: center;
  box-shadow: 0 -6px 32px rgba(79, 70, 229, 0.45);
  z-index: 100;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-1);
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.65);
  font-family: var(--font-family);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-full);
  transition: all 0.2s ease;
}

.nav-item svg path,
.nav-item svg rect,
.nav-item svg circle {
  stroke: rgba(255, 255, 255, 0.65);
}

.nav-item.active {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.22);
}

.nav-item.active svg path,
.nav-item.active svg rect,
.nav-item.active svg circle {
  stroke: #ffffff;
}
.nav-item.active svg circle {
  fill: #ffffff;
}