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

:root {
  --sand:    #e8e0d0;
  --salt:    #f4f1ea;
  --clay:    #c4b49a;
  --dark:    #1a1814;
  --ink:     #2d2a26;
  --muted:   #7a7268;
  --accent:  #8b6f47;

  --serif:   'Georgia', 'Times New Roman', serif;
  --sans:    'Helvetica Neue', Helvetica, Arial, sans-serif;

  --gap:     clamp(1.5rem, 4vw, 3rem);
  --max-w:   1200px;
}

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

body {
  background: var(--dark);
  color: var(--sand);
  font-family: var(--serif);
  line-height: 1.7;
  overflow-x: hidden;
}

img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ═══════════════════════════════════════════
   HERO
═══════════════════════════════════════════ */
#hero {
  position: relative;
  width: 100%;
  height: 100dvh;
  min-height: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.video-wrap {
  position: absolute;
  inset: 0;
}

#hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.video-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(20, 18, 14, 0.35) 0%,
    rgba(20, 18, 14, 0.55) 60%,
    rgba(20, 18, 14, 0.80) 100%
  );
}


/* ── Sound toggle ── */
.sound-toggle {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 100;
  background: rgba(20, 18, 14, 0.5);
  border: 1px solid rgba(232, 224, 208, 0.2);
  color: var(--sand);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  cursor: pointer;
  backdrop-filter: blur(6px);
  transition: background 0.2s, border-color 0.2s;
}

.sound-toggle:hover {
  background: rgba(20, 18, 14, 0.75);
  border-color: rgba(232, 224, 208, 0.4);
}

.sound-toggle svg {
  width: 0.95rem;
  flex-shrink: 0;
}

.scroll-cue {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--clay);
  animation: fadeUp 2s 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.scroll-label {
  font-family: var(--sans);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

.scroll-arrow svg {
  width: 1.4rem;
  animation: bounce 2s ease-in-out infinite;
}

/* ═══════════════════════════════════════════
   INTRO
═══════════════════════════════════════════ */
#intro {
  background: var(--dark);
  padding: clamp(5rem, 12vw, 10rem) var(--gap);
}

.intro-inner {
  max-width: 680px;
  margin: 0 auto;
}

.intro-text {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.8;
  color: var(--sand);
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity 0.9s ease, transform 0.9s ease;
}

.intro-text.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ═══════════════════════════════════════════
   SCROLLYTELLING
═══════════════════════════════════════════ */
#scrolly {
  background: var(--dark);
}

.scrolly-chapter {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  position: relative;
}

/* Alternate image side every other chapter */
.scrolly-chapter:nth-child(even) .sticky-image {
  order: 2;
}
.scrolly-chapter:nth-child(even) .steps {
  order: 1;
}

/* ── Sticky image pane ── */
.sticky-image {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
  flex-shrink: 0;
}

.sticky-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.25s ease;
}

.img-label {
  position: absolute;
  top: 1.2rem;
  left: 1.2rem;
  font-family: var(--sans);
  font-size: 0.58rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(232, 224, 208, 0.6);
  background: rgba(20, 18, 14, 0.45);
  padding: 0.3em 0.7em;
  backdrop-filter: blur(4px);
}

.photo-credit {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  font-family: var(--sans);
  font-size: 0.48rem;
  letter-spacing: 0.08em;
  color: rgba(232, 224, 208, 0.35);
}

/* inline APA citations */
.ref {
  font-family: var(--sans);
  font-size: 0.72em;
  color: var(--clay);
  opacity: 0.8;
  white-space: nowrap;
}

/* ── Text steps pane ── */
.steps {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 0;
}

.step {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(3rem, 7vw, 6rem) clamp(2rem, 5vw, 4.5rem);
  opacity: 0;
  transform: translateY(2.5rem);
  transition: opacity 0.75s ease, transform 0.75s ease;
  border-top: 1px solid rgba(196, 180, 154, 0.12);
}

.step:first-child {
  border-top: none;
}

.step.active {
  opacity: 1;
  transform: translateY(0);
}

.step h3 {
  font-family: var(--sans);
  font-size: clamp(0.65rem, 1.2vw, 0.78rem);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--clay);
  margin-bottom: 1.5rem;
}

.step p {
  font-size: clamp(0.97rem, 1.5vw, 1.12rem);
  line-height: 1.85;
  color: var(--sand);
  max-width: 52ch;
}

.step p + p {
  margin-top: 1.2em;
}

/* ── Two-image duo panel ── */
.sticky-duo {
  display: none;
  position: absolute;
  inset: 0;
  grid-template-rows: 1fr 1fr;
  gap: 0.35rem;
  background: var(--dark);
}

.sticky-duo.active {
  display: grid;
}

.duo-img {
  position: relative;
  overflow: hidden;
}

.duo-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}

.duo-img figcaption {
  position: absolute;
  bottom: 0.5rem;
  right: 0.75rem;
  font-family: var(--sans);
  font-size: 0.48rem;
  letter-spacing: 0.08em;
  color: rgba(0, 0, 0, 0.7);
}

/* Ramsar maps: show full image without cropping */
.sticky-duo--contain .duo-img img {
  object-fit: contain;
  object-position: center;
  background: #fff;
}

/* ═══════════════════════════════════════════
   CLOSING TITLE
═══════════════════════════════════════════ */
#closing {
  background: var(--dark);
  padding: clamp(8rem, 18vw, 16rem) var(--gap);
  border-top: 1px solid rgba(196, 180, 154, 0.1);
}

.closing-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  opacity: 0;
  transform: translateY(2.5rem);
  transition: opacity 1s ease, transform 1s ease;
}

.closing-inner.visible {
  opacity: 1;
  transform: translateY(0);
}

.closing-place {
  font-family: var(--sans);
  font-size: clamp(0.65rem, 1.4vw, 0.8rem);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--clay);
  margin-bottom: 2rem;
}

.closing-title {
  font-size: clamp(3.5rem, 10vw, 9rem);
  font-weight: 400;
  line-height: 0.93;
  letter-spacing: -0.015em;
  color: var(--salt);
  margin-bottom: 2rem;
}

.closing-sub {
  font-family: var(--sans);
  font-size: clamp(0.72rem, 1.6vw, 0.95rem);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--clay);
}

/* ═══════════════════════════════════════════
   MULTI-IMAGE GRID CHAPTER (Birth)
═══════════════════════════════════════════ */
.scrolly-chapter--grid {
  grid-template-columns: 1fr 1fr;
}

.sticky-grid {
  position: sticky;
  top: 0;
  height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 0.35rem;
  padding: 0.35rem;
  background: var(--dark);
}

.sticky-grid .img-label {
  position: absolute;
  top: 1.2rem;
  left: 1.2rem;
  z-index: 2;
}

/* reclamation map spans full top row */
.mini-img--wide {
  grid-column: 1 / -1;
}

.mini-img {
  position: relative;
  overflow: hidden;
  opacity: 0.25;
  transition: opacity 0.4s ease;
  margin: 0;
}

.mini-img.active {
  opacity: 1;
}

.mini-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.step-figure {
  margin-top: 1.5rem;
  overflow: hidden;
}

.step-figure img {
  width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: cover;
  display: block;
}

.step-figure figcaption {
  font-family: var(--sans);
  font-size: 0.5rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-top: 0.4rem;
}

.mini-img figcaption {
  position: absolute;
  bottom: 0.5rem;
  right: 0.5rem;
  font-family: var(--sans);
  font-size: 0.45rem;
  letter-spacing: 0.07em;
  color: rgba(232, 224, 208, 0.45);
  text-align: right;
  max-width: 80%;
}

@media (max-width: 768px) {
  .scrolly-chapter--grid {
    grid-template-columns: 1fr;
  }

  .sticky-grid {
    position: relative;
    height: auto;
    aspect-ratio: 1;
  }
}

/* ═══════════════════════════════════════════
   FOOTER
═══════════════════════════════════════════ */
#footer {
  background: var(--ink);
  border-top: 1px solid rgba(196, 180, 154, 0.15);
  padding: clamp(3rem, 8vw, 6rem) var(--gap);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.footer-title {
  font-family: var(--sans);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-weight: 400;
}

.footer-sub {
  font-family: var(--sans);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.footer-designer {
  font-family: var(--sans);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  letter-spacing: 0.05em;
  color: var(--sand);
  margin-top: 0.8rem;
}

.footer-year {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin-top: 0.25rem;
}

/* ═══════════════════════════════════════════
   ANIMATIONS
═══════════════════════════════════════════ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(2rem); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(6px); }
}

/* ═══════════════════════════════════════════
   RESPONSIVE — collapse to single column
═══════════════════════════════════════════ */
@media (max-width: 768px) {
  .scrolly-chapter {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .scrolly-chapter:nth-child(even) .sticky-image,
  .scrolly-chapter:nth-child(even) .steps {
    order: unset;
  }

  .sticky-image {
    position: relative;
    height: 60vw;
    min-height: 260px;
    max-height: 480px;
  }

  .step {
    min-height: auto;
    padding: clamp(2rem, 8vw, 3.5rem) clamp(1.5rem, 5vw, 2.5rem);
  }
}

/* ═══════════════════════════════════════════
   SCROLLBAR
═══════════════════════════════════════════ */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--dark); }
::-webkit-scrollbar-thumb { background: var(--clay); border-radius: 2px; }