/* === CSS Variables === */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a26;
  --accent-red: #ff4d6d;
  --accent-blue: #5e9fff;
  --accent-green: #3dd9a0;
  --accent-yellow: #ffcc4d;
  --text-primary: #f5f5f7;
  --text-secondary: #9898a6;
  --text-muted: #5a5a6a;
  --border-subtle: rgba(255,255,255,0.06);
  --glow-red: rgba(255, 77, 109, 0.35);
  --glow-blue: rgba(94, 159, 255, 0.35);
  --glow-green: rgba(61, 217, 160, 0.35);
  --glow-yellow: rgba(255, 204, 77, 0.25);
  
  --font-display: 'Outfit', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', sans-serif;
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 28px;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* === Typography === */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
}

p {
  color: var(--text-secondary);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-red), #ff6b8a);
  color: white;
  box-shadow: 0 4px 20px var(--glow-red);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--glow-red);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: rgba(255,255,255,0.12);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

/* === Cards === */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-smooth);
}

.card:hover {
  border-color: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

/* === Animations === */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { 
    opacity: 0;
    transform: translateY(30px);
  }
  to { 
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from { 
    opacity: 0;
    transform: translateX(-30px);
  }
  to { 
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes ripple {
  0% { transform: scale(0); opacity: 1; }
  100% { transform: scale(4); opacity: 0; }
}

.animate-fade-in {
  animation: fadeIn var(--transition-smooth) ease-out forwards;
}

.animate-slide-up {
  animation: slideUp var(--transition-smooth) ease-out forwards;
}

/* === Layout === */
.container {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 40px 24px;
  text-align: center;
}

.screen.active {
  display: flex;
}

/* === Progress Bar === */
.progress-container {
  width: 100%;
  max-width: 400px;
  margin: 20px 0;
}

.progress-bar {
  height: 6px;
  background: var(--bg-card);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-yellow));
  border-radius: 3px;
  transition: width var(--transition-smooth);
}

/* === Choice Cards === */
.choices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  width: 100%;
  max-width: 600px;
  margin-top: 30px;
}

.choice-card {
  background: var(--bg-card);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: 20px;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.choice-card:hover {
  border-color: var(--accent-red);
  transform: translateY(-4px);
  box-shadow: 0 10px 40px rgba(233, 69, 96, 0.2);
}

.choice-card.selected {
  border-color: var(--accent-green);
  background: rgba(78, 204, 163, 0.1);
}

.choice-icon {
  font-size: 2.5rem;
  margin-bottom: 8px;
}

.choice-label {
  font-weight: 500;
  color: var(--text-primary);
}

/* === Info Cards (Feed) === */
.feed-container {
  width: 100%;
  max-width: 500px;
  max-height: 400px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-right: 8px;
}

.info-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-subtle);
  animation: slideInLeft 0.4s ease-out backwards;
}

.info-card:hover {
  transform: translateX(8px);
  border-color: var(--accent-blue);
}

.info-card .source {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.info-card .source-icon {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.info-card .content {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.info-card .tags {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.info-card .tag {
  font-size: 0.7rem;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(255,255,255,0.05);
  color: var(--text-muted);
}

/* === Stats Display === */
.stats-row {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin: 20px 0;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  padding: 16px 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  min-width: 120px;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.stat-item.danger .stat-value {
  color: var(--accent-red);
}

.stat-item.success .stat-value {
  color: var(--accent-green);
}

.stat-item.warning .stat-value {
  color: var(--accent-yellow);
}

/* === Web (Cobweb) Visualization === */
.web-container {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 20px auto;
}

.web-svg {
  width: 100%;
  height: 100%;
}

.web-line {
  stroke: var(--accent-red);
  stroke-width: 2;
  fill: none;
  opacity: 0.3;
}

.web-node {
  fill: var(--accent-red);
  transition: all var(--transition-fast);
}

.web-center {
  fill: var(--accent-green);
}

/* === Chapter Title === */
.chapter-title {
  margin-bottom: 8px;
  color: var(--accent-yellow);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* === Narrative Text === */
.narrative {
  max-width: 600px;
  margin: 0 auto 30px;
}

.narrative p {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

/* === Ending Stats === */
.ending-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
  max-width: 700px;
  margin: 30px 0;
}

.ending-stat {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.ending-stat .value {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.ending-stat .label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* === Tips Box === */
.tips-box {
  background: linear-gradient(135deg, rgba(79, 140, 255, 0.1), rgba(78, 204, 163, 0.1));
  border: 1px solid rgba(79, 140, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 20px;
  max-width: 500px;
  margin: 20px auto;
  text-align: left;
}

.tips-box h4 {
  color: var(--accent-blue);
  margin-bottom: 12px;
  font-size: 1rem;
}

.tips-box ul {
  list-style: none;
}

.tips-box li {
  color: var(--text-secondary);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  font-size: 0.9rem;
}

.tips-box li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent-green);
}

/* === Responsive === */
@media (max-width: 600px) {
  .choices-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stats-row {
    gap: 12px;
  }
  
  .stat-item {
    min-width: 90px;
    padding: 12px 16px;
  }
  
  .stat-value {
    font-size: 1.5rem;
  }
}

/* === Utility === */
.hidden {
  display: none !important;
}

.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }
.mt-6 { margin-top: 48px; }

.text-center { text-align: center; }
.text-left { text-align: left; }

/* === Chapter Progress === */
.chapter-progress {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 30px;
}

.chapter-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--text-muted);
  transition: all var(--transition-fast);
}

.chapter-dot.active {
  background: var(--accent-yellow);
  border-color: var(--accent-yellow);
  box-shadow: 0 0 12px var(--glow-yellow);
}

.chapter-dot.completed {
  background: var(--accent-green);
  border-color: var(--accent-green);
}

/* === Scrollbar === */
.feed-container::-webkit-scrollbar {
  width: 6px;
}

.feed-container::-webkit-scrollbar-track {
  background: transparent;
}

.feed-container::-webkit-scrollbar-thumb {
  background: var(--bg-card);
  border-radius: 3px;
}

.feed-container::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* === Background Effects === */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(ellipse at 20% 20%, rgba(255, 77, 109, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(94, 159, 255, 0.08) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* === Better Card Hover === */
.info-card {
  position: relative;
  overflow: hidden;
}

.info-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent-blue);
  transform: scaleY(0);
  transition: transform var(--transition-fast);
}

.info-card:hover::before {
  transform: scaleY(1);
}

/* === Stagger Animation === */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }