/* DESIGN SYSTEM TOKENS */
:root {
  /* COLORS */
  --color-bg-base: #f7f4ec; /* warm off-white / unbleached paper */
  --color-bg-surface: #ffffff;
  --color-text-main: #1f2a24; /* deep charcoal-green ink */
  --color-text-muted: #4e5e54;
  --color-accent: #3c5a45; /* muted forest/khondalite green */
  --color-accent-hover: #2c4233;
  --color-accent-rust: #b5652b; /* terracotta/laterite rust */
  --color-accent-ochre: #d4a373; /* dusty gold/ochre */
  --color-border: #dfdbce; /* slightly darker than bg-base */
  --color-focus: #b5652b;

  /* TYPOGRAPHY */
  --font-family-headings: Georgia, "Times New Roman", serif;
  --font-family-body: Georgia, "Times New Roman", serif;
  --font-family-mono: "JetBrains Mono", monospace;
  --font-family-ui: Georgia, "Times New Roman", serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-8: 4rem;
  --space-12: 6rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --container-max-width: 1200px;
  --article-max-width: 1000px;
}

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

html {
  font-size: 17px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg-base);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.04'/%3E%3C/svg%3E");
  color: var(--color-text-main);
  font-family: var(--font-family-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* TYPOGRAPHY */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-family-headings);
  line-height: 1.2;
  color: var(--color-text-main);
  margin-bottom: var(--space-3);
  font-weight: 700;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-hover);
}

a:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

p {
  margin-bottom: var(--space-4);
  text-align: justify;
  hyphens: none;
  -webkit-hyphens: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ACCESSIBILITY */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: 8px;
  z-index: 1000;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 0;
}

/* LAYOUT */
/* LAYOUT CONTAINERS 
   .container: Standard content width (max ~1200px)
   .container-wide: Immersive sections (max ~1400px)
   .container-read: Long-form text (max ~68ch)
*/
.site-wrapper {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.site-main {
  flex-grow: 1;
  padding-top: 50px; /* Compensate for fixed header */
}

/* Home page hero section needs to underlap the transparent header */
.home-template .site-main {
  padding-top: 0;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container-wide {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container-read {
  width: 100%;
  max-width: 68ch;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* HEADER */
.site-header {
  background-color: transparent;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: var(--space-4) 0 var(--space-3) 0;
  transition:
    background-color 0.3s ease,
    backdrop-filter 0.3s ease;
}

.site-header.scrolled {
  background-color: rgba(22, 36, 28, 0.95); /* --color-canopy-deep */
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-canopy-light);
}

.site-header.scrolled .site-logo,
.site-header.scrolled .site-nav .nav-list a,
.site-header.scrolled .site-nav .nav-dropdown-toggle {
  color: var(--color-paper);
}

.site-header.scrolled .site-nav .nav-list a:hover {
  color: var(--color-coral-light);
}

.site-header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-family: var(--font-family-headings);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-text-main);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-logo img {
  max-height: 40px;
}

.site-nav {
  margin-left: auto;
}

.site-nav .nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-5);
  justify-content: flex-end;
}

.site-nav .nav-list a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 1.05rem;
  transition: color 0.2s ease;
  padding-bottom: 4px;
  position: relative;
}

.case-excerpt-container > *:not(p:first-of-type) {
  display: none;
}

.site-nav .nav-list a:hover {
  color: var(--color-accent);
}

.site-nav .nav-list li.nav-current a {
  color: var(--color-text-main);
}

/* Trail marker active state */
.site-nav .nav-list li.nav-current a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-coral);
  border-radius: 2px;
}

/* Header Controls */
.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: var(--space-4);
}

.home-template .site-header:not(.scrolled) .site-logo,
.home-template .site-header:not(.scrolled) .site-nav .nav-list a,
.home-template .site-header:not(.scrolled) .site-nav .nav-dropdown-toggle,
.home-template .site-header:not(.scrolled) .header-controls button,
.has-fixed-bg .site-header:not(.scrolled) .site-logo,
.has-fixed-bg .site-header:not(.scrolled) .site-nav .nav-list a,
.has-fixed-bg .site-header:not(.scrolled) .site-nav .nav-dropdown-toggle,
.has-fixed-bg .site-header:not(.scrolled) .header-controls button {
  color: #ffffff;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.6);
}

.mobile-menu-toggle {
  background: none;
  border: none;
  color: inherit;
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2);
}

.audio-toggle {
  position: fixed;
  bottom: var(--space-4);
  left: var(--space-4);
  z-index: 1000;
  background: var(--color-canopy-deep);
  color: var(--color-paper);
  border: 1px solid var(--color-canopy-light);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  transition:
    transform 0.2s ease,
    background 0.2s ease;
}

.audio-toggle:hover {
  transform: scale(1.05);
  background: var(--color-canopy-mid);
}

.audio-toggle[data-state="playing"] {
  color: var(--color-coral);
}

.audio-toggle[data-state="playing"] .icon-speaker-muted {
  display: none;
}

.audio-toggle[data-state="playing"] .icon-speaker-playing {
  display: block !important;
}

/* Micro-interaction tooltip/pulse */
.audio-hint-pulse {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 30px;
  height: 30px;
  background-color: var(--color-coral);
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  opacity: 0;
  pointer-events: none;
  z-index: -1;
}

@keyframes audioHintPulseAnim {
  0% {
    transform: translate(-50%, -50%) scale(0.8);
    opacity: 0;
  }
  50% {
    opacity: 0.4;
  }
  100% {
    transform: translate(-50%, -50%) scale(1.5);
    opacity: 0;
  }
}

.audio-toggle.hint-active .audio-hint-pulse {
  animation: audioHintPulseAnim 2s infinite ease-out;
}

.mobile-menu-toggle {
  display: none; /* Hidden on desktop */
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-canopy-deep);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.3s ease,
    visibility 0.3s ease;
}

.mobile-menu-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu-overlay .nav-list {
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
  font-size: var(--text-2xl);
}

.mobile-menu-overlay .nav-list a {
  color: var(--color-paper);
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.4s ease,
    transform 0.4s ease;
}

.mobile-menu-overlay.is-open .nav-list a {
  opacity: 1;
  transform: translateY(0);
}

/* Add stagger delay for mobile menu items */
.mobile-menu-overlay.is-open .nav-list li:nth-child(1) a {
  transition-delay: 0.1s;
}
.mobile-menu-overlay.is-open .nav-list li:nth-child(2) a {
  transition-delay: 0.15s;
}
.mobile-menu-overlay.is-open .nav-list li:nth-child(3) a {
  transition-delay: 0.2s;
}
.mobile-menu-overlay.is-open .nav-list li:nth-child(4) a {
  transition-delay: 0.25s;
}
.mobile-menu-overlay.is-open .nav-list li:nth-child(5) a {
  transition-delay: 0.3s;
}
.mobile-menu-overlay.is-open .nav-list li:nth-child(6) a {
  transition-delay: 0.35s;
}
.mobile-menu-overlay.is-open .nav-list li:nth-child(7) a {
  transition-delay: 0.4s;
}
.mobile-menu-overlay.is-open .nav-list li:nth-child(8) a {
  transition-delay: 0.45s;
}
.mobile-menu-overlay.is-open .nav-list li:nth-child(9) a {
  transition-delay: 0.5s;
}
.mobile-menu-overlay.is-open .nav-list li:nth-child(10) a {
  transition-delay: 0.55s;
}
.mobile-menu-overlay.is-open .nav-list li:nth-child(11) a {
  transition-delay: 0.6s;
}

@media (max-width: 1024px) {
  .site-nav {
    display: none;
  }
  .mobile-menu-toggle {
    display: flex;
  }
  .site-header {
    color: var(--color-text-main);
  }
  .site-header.is-open,
  .site-header.scrolled {
    color: var(--color-paper);
  }
}

.site-footer {
  background-color: var(--color-canopy-deep);
  color: var(--color-paper);
  padding: var(--space-6) 0 calc(var(--space-4) + 60px);
  margin-top: auto;
  font-size: 1.05rem;
}

.site-footer-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}

.footer-widget h3 {
  font-family: var(--font-family-headings);
  font-size: 1.15rem;
  color: var(--color-bg-base);
  margin-bottom: var(--space-4);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.footer-widget p {
  color: #b0ac9d;
  text-align: left;
}

.footer-widget a {
  color: #e0dcd0;
  transition: color 0.2s ease;
}

.footer-widget a:hover {
  color: var(--color-accent-ochre);
}

.footer-widget .nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  list-style: none;
}

.social-links {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.social-links a {
  color: #b0ac9d;
  transition: color 0.2s ease;
}

.social-links a:hover {
  color: var(--color-accent-ochre);
}

.social-links svg {
  width: 24px;
  height: 24px;
  display: block;
}

.site-footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-4);
  text-align: center;
  font-size: 0.85rem;
  color: #8c897d;
  font-family: var(--font-family-mono);
}

/* EDITORIAL & SCIENTIFIC STYLING */
.mono {
  font-family: var(--font-family-mono);
  font-size: 0.9em;
  letter-spacing: 0.02em;
}

.drop-cap p:first-of-type::first-letter {
  font-family: var(--font-family-headings);
  float: left;
  font-size: 4rem;
  line-height: 0.8;
  padding-top: 4px;
  padding-right: 8px;
  padding-left: 3px;
  color: var(--color-accent);
}

.editorial-layout {
  max-width: var(--article-max-width);
  margin: 0 auto;
}

.editorial-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  max-width: var(--container-max-width);
  margin: 0 auto;
}

@media (min-width: 900px) {
  .editorial-grid {
    grid-template-columns: 3fr 2fr;
    align-items: center;
  }
}

.case-stats-sidebar {
  background-color: #f0ebd8;
  border-radius: var(--radius-md);
  padding: var(--space-5);
  box-shadow: inset 0 0 40px rgba(181, 101, 43, 0.03);
  border: 1px solid rgba(181, 101, 43, 0.1);
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 600px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.stats-grid > hr {
  display: none;
}

.stats-grid > p {
  border-bottom: 1px solid rgba(60, 90, 69, 0.15);
  padding-bottom: var(--space-3);
  margin-bottom: 0;
  font-family: var(--font-family-mono);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.stats-grid > p:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.stats-grid > p strong {
  display: block;
  font-family: var(--font-family-headings);
  font-size: 1.8rem;
  color: var(--color-accent-rust);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-1);
  text-transform: none;
  letter-spacing: normal;
}

.case-sidebar {
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.stat-highlight span.mono {
  display: block;
  font-size: 1.5rem;
  color: var(--color-accent-rust);
  margin-bottom: var(--space-1);
  font-weight: 600;
}

.stat-highlight p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Asymmetric Grid for Research */
.asymmetric-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

.asymmetric-grid > article:nth-child(1) {
  grid-column: span 8;
}

.asymmetric-grid > article:nth-child(2) {
  grid-column: span 4;
}

.asymmetric-grid > article:nth-child(3) {
  grid-column: span 12;
}

/* Field Journal Grid for Team */
.field-journal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-4);
  justify-content: center;
}

/* Card Grid for Research and Publications */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-5);
}

.editorial-header {
  border-bottom: 2px solid var(--color-border);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.editorial-header h2 {
  margin-bottom: 0;
}

/* Slider Overlays */
.slide-content-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  background: linear-gradient(
    to right,
    rgba(31, 42, 36, 0.7) 0%,
    rgba(31, 42, 36, 0) 100%
  );
  z-index: 10;
}

.slide-credit {
  position: absolute;
  bottom: var(--space-3);
  right: var(--space-3);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.75rem;
  z-index: 15;
  background: rgba(31, 42, 36, 0.5);
  padding: 4px 8px;
  border-radius: 2px;
}

/* HERO CROSSFADE */
.hero-slider .slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.5s ease-in-out;
}
.hero-slider .slide.active {
  opacity: 1;
}


/* ==========================================================================
   FEATURE 4: LIVING PAGE FRAME
   ========================================================================== */
.living-frame {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.frame-corner {
  position: absolute;
  display: flex;
}

.frame-top-left {
  top: -20px;
  left: -20px;
}

.frame-bottom-right {
  bottom: -20px;
  right: -20px;
  flex-direction: row-reverse;
  align-items: flex-end;
}

/* Depth layering */
.leaf-back {
  color: var(--color-canopy-mid);
  opacity: 0.85;
  z-index: 1;
}

.fern-front {
  color: var(--color-canopy-light);
  opacity: 0.7;
  z-index: 2;
  margin-left: -100px;
  margin-top: -50px;
}

.flower-accent {
  color: var(--color-coral);
  z-index: 3;
  margin-right: -40px;
  margin-bottom: 20px;
}

/* Hero specific */
.hero-top-border {
  position: absolute;
  top: 0;
  left: 0;
  color: var(--color-canopy-light);
  z-index: 20;
  opacity: 0.8;
}

/* Sway Animations */
@keyframes swayIdle {
  0% {
    transform: rotate(0deg);
  }
  50% {
    transform: rotate(3deg);
  }
  100% {
    transform: rotate(0deg);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .sway {
    transform-origin: top left;
    animation-name: swayIdle;
    animation-iteration-count: infinite;
    animation-timing-function: ease-in-out;
  }

  .frame-bottom-right .sway {
    transform-origin: bottom right;
  }

  .sway-slow {
    animation-duration: 12s;
  }
  .sway-medium {
    animation-duration: 8s;
    animation-delay: 1s;
  }
  .sway-fast {
    animation-duration: 6s;
    animation-delay: 2s;
  }
}

/* Simplify on Mobile */
@media (max-width: 768px) {
  .living-frame {
    opacity: 0.4;
  }
  .frame-corner svg {
    transform: scale(0.6);
  }
  .frame-top-left {
    top: -40px;
    left: -40px;
  }
  .frame-bottom-right {
    bottom: -40px;
    right: -40px;
  }
}