/* CSS Design System for Dog Age Calculator */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Color Palette - Vibrant Space/Lilac Theme */
  --bg-dark: hsl(250, 24%, 6%);
  --bg-card: hsla(250, 24%, 12%, 0.5);
  --bg-card-hover: hsla(250, 24%, 16%, 0.75);
  --border-color: hsla(250, 20%, 30%, 0.3);
  --border-glow: hsla(270, 100%, 65%, 0.2);
  
  /* Accents */
  --accent-purple: hsl(270, 100%, 65%);
  --accent-purple-glow: hsla(270, 100%, 65%, 0.4);
  --accent-pink: hsl(330, 100%, 60%);
  --accent-pink-glow: hsla(330, 100%, 60%, 0.4);
  --accent-cyan: hsl(180, 100%, 45%);
  --accent-cyan-glow: hsla(180, 100%, 45%, 0.4);
  --accent-gold: hsl(45, 100%, 55%);
  --accent-green: hsl(150, 100%, 45%);
  
  /* Text colors */
  --text-primary: hsl(0, 0%, 96%);
  --text-secondary: hsl(250, 15%, 75%);
  --text-muted: hsl(250, 12%, 55%);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
  --gradient-success: linear-gradient(135deg, var(--accent-cyan), var(--accent-green));
  --gradient-gold: linear-gradient(135deg, var(--accent-gold), hsl(25, 100%, 55%));
  --gradient-glow: radial-gradient(circle, hsla(270, 100%, 60%, 0.15) 0%, transparent 70%);

  /* Animation timing */
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.25, 1, 0.5, 1);
  
  /* System font */
  --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* Base resets & layout */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  background-image: 
    var(--gradient-glow),
    radial-gradient(circle at 80% 20%, hsla(330, 100%, 60%, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 10% 80%, hsla(180, 100%, 50%, 0.08) 0%, transparent 50%);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 2rem 1rem;
  overflow-x: hidden;
}

/* App container */
.app-container {
  width: 100%;
  max-width: 900px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  z-index: 2;
}

@media (min-width: 768px) {
  .app-container {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }
  
  .header-section {
    grid-column: span 2;
  }
  
  .results-column {
    position: sticky;
    top: 2rem;
  }
}

/* Header typography */
.header-section {
  text-align: center;
  margin-bottom: 1rem;
  animation: fadeInDown 0.8s var(--ease-smooth);
}

.header-section h1 {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
  display: inline-block;
}

.header-section p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 400;
  max-width: 600px;
  margin: 0 auto;
}

/* Glassmorphism card styles */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 2rem;
  box-shadow: 0 12px 40px -8px rgba(0, 0, 0, 0.4);
  transition: border-color 0.4s var(--ease-smooth), box-shadow 0.4s var(--ease-smooth);
}

.glass-card:hover {
  border-color: var(--border-glow);
  box-shadow: 
    0 16px 48px -6px rgba(0, 0, 0, 0.5),
    0 0 24px 0 var(--border-glow);
}

/* Form Styles */
.calculator-form {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.form-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  letter-spacing: 0.02em;
}

.form-label span.badge {
  background: hsla(270, 100%, 65%, 0.15);
  color: var(--accent-purple);
  padding: 0.2rem 0.6rem;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  border: 1px solid var(--border-glow);
}

/* Inputs & Interactive Components */
input[type="text"] {
  width: 100%;
  background: hsla(250, 24%, 6%, 0.4);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.9rem 1.2rem;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 1rem;
  transition: all 0.3s var(--ease-smooth);
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--accent-purple);
  box-shadow: 0 0 12px var(--accent-purple-glow);
  background: hsla(250, 24%, 6%, 0.6);
}

/* Size Selection Cards */
.size-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.size-option {
  background: hsla(250, 24%, 16%, 0.3);
  border: 1.5px solid var(--border-color);
  border-radius: 16px;
  padding: 1rem;
  cursor: pointer;
  text-align: center;
  transition: all 0.4s var(--ease-spring);
  position: relative;
  overflow: hidden;
}

.size-option:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  background: hsla(250, 24%, 18%, 0.6);
}

.size-option.active {
  background: linear-gradient(135deg, hsla(270, 100%, 65%, 0.1) 0%, hsla(330, 100%, 60%, 0.1) 100%);
  border-color: var(--accent-purple);
  box-shadow: 0 0 16px var(--accent-purple-glow);
}

.size-option.active::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
}

.size-icon {
  font-size: 1.5rem;
  margin-bottom: 0.3rem;
  display: block;
}

.size-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.size-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* Slider Controls */
.slider-container {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.slider-wrapper {
  flex-grow: 1;
  position: relative;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: hsla(250, 20%, 20%, 0.5);
  outline: none;
  transition: background 0.3s;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--text-primary);
  border: 3px solid var(--accent-purple);
  box-shadow: 0 0 8px var(--accent-purple-glow);
  cursor: pointer;
  transition: transform 0.2s var(--ease-spring), box-shadow 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.25);
  box-shadow: 0 0 15px var(--accent-purple);
}

input[type="range"]::-webkit-slider-thumb:active {
  transform: scale(1.35);
  background: var(--accent-pink);
  border-color: var(--text-primary);
  box-shadow: 0 0 20px var(--accent-pink);
}

.slider-value {
  min-width: 3.5rem;
  text-align: right;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: hsla(180, 100%, 45%, 0.08);
  padding: 0.3rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--accent-cyan-glow);
}

/* Autocomplete Breed Dropdown */
.breed-search-container {
  position: relative;
}

.breed-results-list {
  position: absolute;
  top: 105%;
  left: 0;
  right: 0;
  background: hsl(250, 24%, 12%);
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  max-height: 200px;
  overflow-y: auto;
  z-index: 10;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  display: none;
}

.breed-item {
  padding: 0.8rem 1.2rem;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background-color 0.2s var(--ease-smooth);
}

.breed-item:hover {
  background: hsla(270, 100%, 65%, 0.15);
  color: var(--text-primary);
}

/* Formula Toggle Switch */
.toggle-wrapper {
  background: hsla(250, 24%, 8%, 0.6);
  border: 1px solid var(--border-color);
  padding: 0.3rem;
  border-radius: 16px;
  display: flex;
  position: relative;
}

.toggle-bg-slider {
  position: absolute;
  top: 4px;
  left: 4px;
  width: calc(50% - 4px);
  height: calc(100% - 8px);
  background: var(--gradient-primary);
  border-radius: 12px;
  z-index: 1;
  transition: transform 0.4s var(--ease-spring);
  box-shadow: 0 4px 12px rgba(230, 0, 120, 0.3);
}

.toggle-option {
  flex: 1;
  text-align: center;
  padding: 0.75rem 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  z-index: 2;
  transition: color 0.3s;
  color: var(--text-secondary);
}

.toggle-option.active {
  color: var(--text-primary);
}

/* Calculate button */
.btn-calculate {
  background: var(--gradient-primary);
  border: none;
  border-radius: 16px;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 1.1rem;
  font-weight: 800;
  padding: 1.1rem;
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: all 0.3s var(--ease-spring);
  box-shadow: 0 8px 24px -6px var(--accent-pink-glow);
  position: relative;
  overflow: hidden;
}

.btn-calculate:hover {
  transform: translateY(-2px);
  box-shadow: 
    0 12px 30px -4px var(--accent-pink-glow),
    0 0 20px 0 var(--accent-purple-glow);
  filter: brightness(1.1);
}

.btn-calculate:active {
  transform: translateY(1px);
  filter: brightness(0.9);
}

.btn-calculate::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 80%);
  transform: scale(0);
  transition: transform 0.5s ease-out;
  pointer-events: none;
}

.btn-calculate:active::before {
  transform: scale(1.2);
}

/* Avatar Card & Interactive Dog Styling */
.avatar-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  position: relative;
}

.dog-avatar-svg {
  width: 160px;
  height: 160px;
  filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.4));
  transition: all 0.5s var(--ease-spring);
  transform-origin: bottom center;
}

/* Dog SVG Animation States */
.dog-avatar-svg.state-puppy {
  animation: puppyBounce 0.8s infinite alternate var(--ease-spring);
}

.dog-avatar-svg.state-adult {
  animation: adultFloat 3s infinite ease-in-out;
}

.dog-avatar-svg.state-mature {
  animation: matureNod 2.5s infinite ease-in-out;
}

.dog-avatar-svg.state-senior {
  animation: seniorSway 4s infinite ease-in-out;
}

.dog-avatar-svg.calculating {
  animation: dogSpin 0.7s infinite linear !important;
}

/* Custom tail wagging using CSS animation inside SVG */
.tail-wag {
  transform-origin: 20px 60px;
  animation: tailWagFast 0.3s infinite alternate ease-in-out;
}

.tail-wag-slow {
  transform-origin: 20px 60px;
  animation: tailWagSlow 0.6s infinite alternate ease-in-out;
}

/* Result Display Section */
.result-display {
  display: none;
  flex-direction: column;
  gap: 1.5rem;
  animation: scaleIn 0.5s var(--ease-spring);
}

.result-card-inner {
  text-align: center;
  background: radial-gradient(circle at top right, hsla(270, 100%, 65%, 0.08), transparent 60%);
}

.result-title {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-pink);
  margin-bottom: 0.5rem;
}

.result-number-container {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.4rem;
  margin: 0.5rem 0;
}

.result-number {
  font-size: 4.5rem;
  font-weight: 800;
  line-height: 1;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 4px 12px var(--accent-purple-glow));
}

.result-unit {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.result-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 0.5rem;
}

.result-subtitle strong {
  color: var(--text-primary);
}

/* Lifespan timeline & stage analysis */
.badge-container {
  display: flex;
  justify-content: center;
  margin: 0.5rem 0;
}

.achievement-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: linear-gradient(135deg, hsla(45, 100%, 55%, 0.15), hsla(15, 100%, 55%, 0.15));
  border: 1px solid hsla(45, 100%, 55%, 0.3);
  border-radius: 30px;
  color: var(--accent-gold);
  font-weight: 800;
  font-size: 0.85rem;
  box-shadow: 0 0 15px rgba(255, 180, 0, 0.15);
  animation: pulseGold 2s infinite ease-in-out;
}

.stage-card {
  background: hsla(250, 24%, 6%, 0.3);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.25rem;
}

.stage-header {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent-cyan);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.stage-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Timeline Comparison */
.timeline-card {
  margin-top: 0.5rem;
}

.timeline-header {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
}

.timeline-track {
  height: 6px;
  background: hsla(250, 20%, 20%, 0.5);
  border-radius: 3px;
  position: relative;
  margin: 1.5rem 0;
}

.timeline-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 3px;
  width: 0%;
  transition: width 1s var(--ease-smooth);
}

.timeline-node {
  position: absolute;
  top: 50%;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg-dark);
  border: 3px solid var(--accent-purple);
  transform: translate(-50%, -50%);
  z-index: 3;
}

.timeline-node-dog {
  left: 0%;
  border-color: var(--accent-cyan);
  transition: left 1s var(--ease-smooth);
}

.timeline-node-human {
  left: 0%;
  border-color: var(--accent-pink);
  transition: left 1s var(--ease-smooth);
  box-shadow: 0 0 10px var(--accent-pink);
}

.timeline-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.timeline-legend {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.8rem;
  margin-top: 0.8rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.legend-dot.dog { background-color: var(--accent-cyan); }
.legend-dot.human { background-color: var(--accent-pink); }

/* Confetti overlay */
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 999;
}

/* Keyframe Animations */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes puppyBounce {
  0% { transform: translateY(0) scaleY(1); }
  40% { transform: translateY(-12px) scaleY(1.02); }
  90% { transform: translateY(2px) scaleY(0.96); }
  100% { transform: translateY(0) scaleY(1); }
}

@keyframes adultFloat {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-6px) rotate(1deg); }
  100% { transform: translateY(0px) rotate(0deg); }
}

@keyframes matureNod {
  0% { transform: rotate(0deg); }
  40% { transform: rotate(2deg) translateY(-2px); }
  80% { transform: rotate(-1deg); }
  100% { transform: rotate(0deg); }
}

@keyframes seniorSway {
  0% { transform: rotate(-1deg); }
  50% { transform: rotate(1deg) translateY(1px); }
  100% { transform: rotate(-1deg); }
}

@keyframes dogSpin {
  0% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(0.85) rotate(180deg); }
  100% { transform: scale(1) rotate(360deg); }
}

@keyframes tailWagFast {
  0% { transform: rotate(-15deg); }
  100% { transform: rotate(20deg); }
}

@keyframes tailWagSlow {
  0% { transform: rotate(-8deg); }
  100% { transform: rotate(12deg); }
}

@keyframes pulseGold {
  0% { box-shadow: 0 0 10px rgba(255, 180, 0, 0.15); border-color: hsla(45, 100%, 55%, 0.3); }
  50% { box-shadow: 0 0 20px rgba(255, 180, 0, 0.4); border-color: hsla(45, 100%, 55%, 0.6); }
  100% { box-shadow: 0 0 10px rgba(255, 180, 0, 0.15); border-color: hsla(45, 100%, 55%, 0.3); }
}

/* Audio Indicator Button (Easter Egg) */
.audio-control-indicator {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all 0.3s var(--ease-spring);
}

.audio-control-indicator:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  transform: scale(1.1);
  box-shadow: 0 0 12px var(--accent-cyan-glow);
}

.audio-control-indicator.muted {
  color: var(--text-muted);
}

/* SEO Info Section Styling */
.info-section {
  grid-column: 1 / -1; /* Spans full width on grid */
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 1rem;
  padding: 2.5rem;
  line-height: 1.6;
}

.info-section h2 {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.info-section h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-top: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  letter-spacing: 0.01em;
}

.info-section p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.info-section strong {
  color: var(--text-primary);
}

/* Responsive Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  margin: 1rem 0;
  background: hsla(250, 24%, 6%, 0.4);
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.info-table th {
  background: hsla(270, 100%, 65%, 0.1);
  color: var(--text-primary);
  font-weight: 700;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.info-table td {
  padding: 0.9rem 1.25rem;
  color: var(--text-secondary);
  border-bottom: 1px solid hsla(250, 20%, 30%, 0.15);
  transition: all 0.3s;
}

.info-table tr:last-child td {
  border-bottom: none;
}

.info-table tr:hover td {
  background: hsla(270, 100%, 65%, 0.05);
  color: var(--text-primary);
}

.table-caption {
  font-size: 0.85rem !important;
  color: var(--text-muted) !important;
  font-style: italic;
  margin-top: -0.5rem;
}

/* Info Lists */
.info-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 0.5rem 0;
}

.info-list li {
  position: relative;
  padding-left: 1.75rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.info-list li::before {
  content: '✦';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-pink);
  font-size: 1rem;
}

/* FAQ Container */
.faq-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin: 0.5rem 0;
}

@media (min-width: 768px) {
  .faq-container {
    grid-template-columns: repeat(2, 1fr);
  }
}

.faq-item {
  background: hsla(250, 24%, 6%, 0.25);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.25rem;
  transition: all 0.3s var(--ease-smooth);
}

.faq-item:hover {
  border-color: var(--border-glow);
  background: hsla(250, 24%, 8%, 0.4);
  transform: translateY(-2px);
}

.faq-question {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.faq-answer {
  font-size: 0.85rem !important;
  color: var(--text-secondary);
  line-linecap: round;
  line-height: 1.5;
}