* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #1a1a1a;
  background: #f7f5f2;
  line-height: 1.7;
  font-size: 16px;
}

/* ── Intro header ── */

.intro {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 3rem 2rem;
  background: #1a1a1a;
  color: #f0ece6;
}

.intro h1 {
  font-size: 3.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.intro .subtitle {
  font-size: 1.15rem;
  color: #a09a90;
  max-width: 440px;
  line-height: 1.7;
}

/* ── Scrollytelling layout ── */

#scrolly {
  position: relative;
  display: flex;
}

.scroll-text {
  width: 35%;
  padding: 0 1.5rem;
  position: relative;
  z-index: 2;
}

.scroll-graphic {
  width: 60%;
  margin-left: 5%;
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.graphic-container {
  width: 100%;
  height: 80%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.graphic-placeholder {
  position: relative;
  width: 94%;
  height: 88%;
  background: #ffffff;
  border-radius: 4px;
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.28s ease;
  overflow: hidden;
}

.graphic-label {
  font-size: 1.3rem;
  font-weight: 400;
  font-style: italic;
  color: #999;
}

/* ── Ch.1 cinematic opening ── */

.ch1-cinematic {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: 4px;
  display: none;
}

.ch1-cinematic.active {
  display: block;
}

.ch1-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ch1-overlay {
  position: absolute;
  bottom: 12%;
  left: 0;
  width: 100%;
  text-align: center;
  color: #fff;
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.6), 0 0 40px rgba(0, 0, 0, 0.3);
  pointer-events: none;
  transition: opacity 0.4s ease;
}

/* ── Ch.2 conquest ── */

.ch2-conquest {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 4px;
  display: none;
  overflow: hidden;
}

.ch2-map {
  flex: 0 0 70%;
  overflow: hidden;
  background: #f5f3f0;
  pointer-events: none;
}

.ch2-map svg {
  display: block;
}

.ch2-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 20px 16px;
  border-left: 1px solid #e5e2dd;
  background: #faf9f7;
  overflow: hidden;
  min-width: 0;
}

.ch2-panel-title {
  font-size: 17px;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 10px;
}

.ch2-panel-intro {
  font-size: 13px;
  color: #666;
  line-height: 1.7;
  margin-bottom: 14px;
}

.ch2-dropdown {
  position: relative;
  margin-bottom: 12px;
  user-select: none;
}

.ch2-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border: 1px solid #d5d0c8;
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  font-size: 13px;
  color: #333;
  transition: border-color 0.2s;
}

.ch2-dropdown-trigger:hover {
  border-color: #999;
}

.ch2-dropdown-label {
  flex: 1;
}

.ch2-dropdown-arrow {
  font-size: 10px;
  color: #999;
}

.ch2-dropdown-list {
  display: none;
  position: absolute;
  top: calc(100% + 3px);
  left: 0;
  right: 0;
  background: #fff;
  border: 1px solid #d5d0c8;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  max-height: 220px;
  overflow-y: auto;
  z-index: 100;
}

.ch2-dropdown-list.open {
  display: block;
}

.ch2-dropdown-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  font-size: 12px;
  color: #333;
  cursor: pointer;
  transition: background 0.15s;
}

.ch2-dropdown-option:hover {
  background: #f5f3f0;
}

.ch2-route-detail {
  flex: 1;
  padding-top: 12px;
  border-top: 1px solid #e5e2dd;
  font-size: 13px;
  color: #aaa;
  line-height: 1.7;
  overflow-y: auto;
  font-style: italic;
}

.ch2-route-detail.has-content {
  color: #333;
  font-style: normal;
}

/* ── Viz container (D3 charts) ── */

.viz-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* ── Steps ── */

.step {
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding: 2rem 0;
}

.step:first-child {
  padding-top: 10vh;
}

.step-content {
  background: rgba(255, 255, 255, 0.92);
  padding: 1.6rem 2rem;
  border-left: 3px solid transparent;
  border-radius: 0 4px 4px 0;
  max-width: 380px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.step-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}

.step-content p {
  font-size: 0.95rem;
  color: #444;
  line-height: 1.7;
}

.step.is-active .step-content {
  border-left-color: #1a1a1a;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.06);
}

/* ── Tooltip (shared) ── */

.tooltip {
  position: absolute;
  pointer-events: none;
  background: #fff;
  border: 1px solid #e5e2dd;
  border-radius: 4px;
  padding: 8px 12px;
  font-size: 12px;
  line-height: 1.5;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  z-index: 10;
}

/* ── Closing text ── */

.closing-text {
  max-width: 640px;
  margin: 6rem auto 4rem;
  padding: 0 1.5rem;
}

.closing-text p {
  font-size: 1rem;
  color: #2a2a2a;
  line-height: 1.8;
  margin-bottom: 1.4rem;
}

.closing-text p:last-child {
  margin-bottom: 0;
}

/* ── Closing image ── */

.closing-image {
  display: flex;
  justify-content: center;
  padding: 4rem 0 0;
}

.closing-image img {
  width: 100%;
  display: block;
}

/* ── Footer ── */

footer {
  text-align: center;
  padding: 2rem 1rem 3rem;
  color: #b0a89e;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}