/* ===================================
   The Trail - CSS Styles
   A scroll-based three-zone experience
   =================================== */

/* CSS Custom Properties */
:root {
  /* River Zone - Deep indigo, silver, dark blue-green */
  --river-bg: #1a1a2e;
  --river-accent: #4a6fa5;
  --river-highlight: #7eb2dd;
  --river-text: #b8c5d6;
  --river-silver: #a8b4c4;
  
  /* Forest Zone - Deep green, amber, dusk */
  --forest-bg: #1a2f1a;
  --forest-green: #2d4a2d;
  --forest-amber: #d4a574;
  --forest-highlight: #e8c9a0;
  --forest-text: #c4c9b8;
  --forest-fog: rgba(180, 190, 170, 0.08);
  
  /* Mountain Zone - Gray, brown, muted sage */
  --mountain-bg: #3a3a3a;
  --mountain-gray: #4a4a4a;
  --mountain-brown: #6b5b4f;
  --mountain-sage: #7d8471;
  --mountain-text: #d4d4d4;
  
  /* Transitions */
  --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.3s ease-out;
  
  /* Typography */
  --font-display: 'Georgia', 'Times New Roman', serif;
  --font-body: 'Georgia', serif;
  
  /* Spacing */
  --section-padding: 120px 24px;
  --content-max-width: 720px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  line-height: 1.7;
  color: var(--river-text);
  background: var(--river-bg);
  transition: background-color var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

/* Body Zone States */
body[data-current-zone="river"] {
  background: var(--river-bg);
  color: var(--river-text);
}

body[data-current-zone="forest"] {
  background: var(--forest-bg);
  color: var(--forest-text);
}

body[data-current-zone="mountain"] {
  background: var(--mountain-bg);
  color: var(--mountain-text);
}

/* Accessibility - Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--river-accent);
  color: white;
  padding: 12px 24px;
  border-radius: 0 0 8px 8px;
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--river-highlight);
  outline-offset: 2px;
}

/* ===================================
   Progress Indicator
   =================================== */
.progress-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  z-index: 100;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--river-accent), var(--forest-amber), var(--mountain-sage));
  transition: width 0.1s linear;
}

.progress-zones {
  position: fixed;
  top: 20px;
  right: 24px;
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.5;
  z-index: 100;
}

.progress-zone {
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

.progress-zone.active {
  opacity: 1;
}

.progress-zone[data-zone="river"].active { color: var(--river-highlight); }
.progress-zone[data-zone="forest"].active { color: var(--forest-amber); }
.progress-zone[data-zone="mountain"].active { color: var(--mountain-sage); }

/* ===================================
   Sections - Base
   =================================== */
.section {
  min-height: 100vh;
  padding: var(--section-padding);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}

.section-content {
  max-width: var(--content-max-width);
  width: 100%;
}

/* ===================================
   Opening Section
   =================================== */
.opening {
  background: var(--river-bg);
  text-align: center;
}

.opening-content {
  animation: fadeInUp 1.2s ease-out;
}

.opening h1 {
  font-family: var(--font-display);
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--river-silver);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.opening .subtitle {
  font-size: 1.1rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--river-accent);
  margin-bottom: 48px;
}

.opening .intro {
  font-size: 1.2rem;
  max-width: 500px;
  margin: 0 auto 64px;
  line-height: 1.8;
}

.scroll-indicator {
  animation: bounce 2s infinite;
}

.scroll-arrow {
  font-size: 2rem;
  color: var(--river-accent);
  display: block;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(12px); }
  60% { transform: translateY(6px); }
}

/* ===================================
   Zone Sections
   =================================== */
.zone-header {
  text-align: center;
  margin-bottom: 64px;
  position: relative;
  z-index: 2;
}

.zone-header h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 400;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}

.river-zone .zone-header h2 { color: var(--river-highlight); }
.forest-zone .zone-header h2 { color: var(--forest-amber); }
.mountain-zone .zone-header h2 { color: var(--mountain-sage); }

.zone-subtitle {
  font-size: 0.95rem;
  font-style: italic;
  opacity: 0.7;
  letter-spacing: 0.05em;
}

/* ===================================
   River Zone Effects
   =================================== */
.river-zone {
  background: var(--river-bg);
  overflow: hidden;
}

.water-effect {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  background: 
    radial-gradient(ellipse at 20% 80%, rgba(74, 111, 165, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(126, 178, 221, 0.1) 0%, transparent 40%),
    radial-gradient(ellipse at 50% 50%, rgba(26, 26, 46, 0) 0%, var(--river-bg) 70%);
  animation: waterPulse 8s ease-in-out infinite;
}

@keyframes waterPulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* ===================================
   Forest Zone Effects
   =================================== */
.forest-zone {
  background: var(--forest-bg);
  overflow: hidden;
}

.fog-effect {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  background: 
    linear-gradient(180deg, transparent 0%, var(--forest-fog) 30%, var(--forest-fog) 70%, transparent 100%);
  animation: fogDrift 12s ease-in-out infinite;
}

@keyframes fogDrift {
  0%, 100% { transform: translateX(-5%); opacity: 0.5; }
  50% { transform: translateX(5%); opacity: 0.8; }
}

.campfire-glow {
  position: absolute;
  bottom: 20%;
  right: 15%;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212, 165, 116, 0.2) 0%, transparent 70%);
  animation: fireGlow 4s ease-in-out infinite;
}

@keyframes fireGlow {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.1); }
}

/* ===================================
   Mountain Zone Effects
   =================================== */
.mountain-zone {
  background: var(--mountain-bg);
}

/* ===================================
   Stones Container
   =================================== */
.stones-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  max-width: 1000px;
  width: 100%;
  position: relative;
  z-index: 2;
}

/* ===================================
   Stone Component
   =================================== */
.stone {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 32px;
  border-radius: 4px;
  position: relative;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-medium), transform var(--transition-medium), background var(--transition-fast);
}

.stone.visible {
  opacity: 1;
  transform: translateY(0);
}

.stone::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: 4px 4px 0 0;
  transition: background var(--transition-fast);
}

.river-zone .stone::before { background: var(--river-accent); }
.forest-zone .stone::before { background: var(--forest-amber); }
.mountain-zone .stone::before { background: var(--mountain-sage); }

.stone:hover {
  background: rgba(255, 255, 255, 0.06);
}

.stone:focus-within {
  outline: 2px solid var(--river-highlight);
  outline-offset: 2px;
}

.river-zone .stone:focus-within { outline-color: var(--river-highlight); }
.forest-zone .stone:focus-within { outline-color: var(--forest-amber); }
.mountain-zone .stone:focus-within { outline-color: var(--mountain-sage); }

.stone-text {
  font-size: 1.1rem;
  font-style: italic;
  line-height: 1.7;
  margin-bottom: 16px;
  color: inherit;
}

.stone-text::before {
  content: '"';
  font-size: 2rem;
  line-height: 0;
  vertical-align: -0.3em;
  margin-right: 4px;
  opacity: 0.5;
}

.stone-context {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  opacity: 0.5;
}

/* ===================================
   Transition Stone Component
   =================================== */
.transition-stone-section {
  background: linear-gradient(180deg, var(--river-bg) 0%, var(--forest-bg) 50%, var(--forest-bg) 100%);
  padding: 100px 24px;
}

.transition-stone-section:nth-of-type(4) {
  background: linear-gradient(180deg, var(--forest-bg) 0%, var(--mountain-bg) 50%, var(--mountain-bg) 100%);
}

.transition-stone {
  max-width: var(--content-max-width);
  text-align: center;
}

.transition-stone h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  margin-bottom: 48px;
  color: var(--river-silver);
  text-transform: uppercase;
}

.transition-stone-section:nth-of-type(4) .transition-stone h3 {
  color: var(--forest-amber);
}

.perspective {
  padding: 24px;
  margin-bottom: 24px;
  border-left: 2px solid;
  text-align: left;
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity var(--transition-medium), transform var(--transition-medium);
}

.perspective.visible {
  opacity: 1;
  transform: translateX(0);
}

.perspective.pi { border-color: var(--river-accent); }
.perspective.isaac { border-color: var(--forest-amber); }
.perspective.cairn { border-color: var(--mountain-sage); }

.perspective .author {
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 8px;
}

.perspective.pi .author { color: var(--river-highlight); }
.perspective.isaac .author { color: var(--forest-amber); }
.perspective.cairn .author { color: var(--mountain-sage); }

.perspective p {
  font-style: italic;
  line-height: 1.7;
}

/* ===================================
   Closing Section
   =================================== */
.closing {
  background: var(--mountain-bg);
  text-align: center;
  min-height: 80vh;
}

.closing-content {
  max-width: 600px;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  font-weight: 400;
  color: var(--mountain-sage);
  margin-bottom: 32px;
}

.closing-text {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 24px;
  opacity: 0.8;
}

.cta-button {
  display: inline-block;
  margin-top: 32px;
  padding: 16px 40px;
  background: transparent;
  border: 2px solid var(--mountain-sage);
  color: var(--mountain-sage);
  font-family: var(--font-body);
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 2px;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.cta-button:hover {
  background: var(--mountain-sage);
  color: var(--mountain-bg);
  transform: translateY(-2px);
}

.cta-button:focus {
  outline: 3px solid var(--mountain-sage);
  outline-offset: 3px;
}

.resources-nav {
  margin-top: 64px;
}

.resources-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
}

.resources-nav a {
  color: var(--mountain-text);
  text-decoration: none;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.resources-nav a:hover {
  opacity: 1;
  text-decoration: underline;
}

.resources-nav a:focus {
  outline: 2px solid var(--mountain-sage);
  outline-offset: 2px;
}

/* ===================================
   Footer
   =================================== */
.site-footer {
  background: #2a2a2a;
  padding: 32px 24px;
  text-align: center;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.5;
}

/* ===================================
   Reduced Motion
   =================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
  
  .stone {
    opacity: 1;
    transform: none;
  }
  
  .perspective {
    opacity: 1;
    transform: none;
  }
}

/* ===================================
   Mobile Responsiveness
   =================================== */
@media (max-width: 768px) {
  :root {
    --section-padding: 80px 20px;
  }
  
  .progress-zones {
    display: none;
  }
  
  .stones-container {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .stone {
    padding: 24px;
  }
  
  .section {
    min-height: auto;
    padding: 80px 20px;
  }
  
  .opening {
    min-height: 100vh;
  }
  
  .zone-header {
    margin-bottom: 48px;
  }
  
  .transition-stone {
    padding: 0 16px;
  }
  
  .campfire-glow {
    right: 5%;
    width: 120px;
    height: 120px;
  }
  
  .resources-nav ul {
    flex-direction: column;
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .opening h1 {
    font-size: 2.5rem;
    letter-spacing: 0.1em;
  }
  
  .opening .intro {
    font-size: 1rem;
  }
  
  .stone-text {
    font-size: 1rem;
  }
  
  .cta-button {
    padding: 14px 32px;
    font-size: 0.8rem;
  }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
  .progress-container,
  .progress-zones,
  .scroll-indicator,
  .skip-link {
    display: none;
  }
  
  .section {
    min-height: auto;
    page-break-inside: avoid;
  }
  
  .stone,
  .perspective {
    opacity: 1;
    transform: none;
  }
}