/* ===========================
   RESEARCH PAGE
   =========================== */

/* Active nav link */
.nav-link.active {
  color: var(--black);
  font-weight: 600;
}

/* Page header */
.rp-header {
  padding: 80px 2rem 64px;
}

.rp-header-inner {
  max-width: 780px;
  margin: 0 auto;
}

.rp-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--body-text);
  margin-bottom: 20px;
}

.rp-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--black);
  margin-bottom: 20px;
}

.rp-subtitle {
  font-size: 18px;
  line-height: 1.7;
  color: var(--body-text);
  margin-bottom: 28px;
}

.rp-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.rp-meta-item {
  font-size: 13px;
  color: var(--body-text);
}

.rp-meta-dot {
  color: var(--border);
}

.rp-meta-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--black);
  transition: opacity 0.15s;
}

.rp-meta-link:hover {
  opacity: 0.6;
}

/* Divider */
.rp-divider {
  height: 1px;
  background: var(--border);
  max-width: calc(var(--max-width) - 4rem);
  margin: 0 auto;
}

/* Sections */
.rp-section {
  padding: 80px 2rem;
}

.rp-section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.rp-section-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--body-text);
  opacity: 0.6;
  margin-bottom: 16px;
}

.rp-section-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--black);
  margin-bottom: 24px;
}

.rp-section-title--center {
  text-align: center;
}

.rp-body {
  font-size: 16px;
  line-height: 1.75;
  color: var(--body-text);
  margin-bottom: 16px;
  max-width: 640px;
}

.rp-body--center {
  text-align: center;
  margin: 0 auto 48px;
}

.rp-link {
  display: inline-flex;
  font-size: 15px;
  font-weight: 700;
  color: var(--black);
  transition: opacity 0.15s;
  margin-top: 8px;
}

.rp-link:hover {
  opacity: 0.6;
}

/* Two-column layout */
.rp-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.rp-col-text {
  display: flex;
  flex-direction: column;
}

.rp-col-visual {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ===========================
   DATA GAP DIAGRAM
   =========================== */

.data-gap-diagram {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
  border-radius: var(--radius-card);
  padding: 28px;
}

.data-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.data-col-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--body-text);
}

.data-tags {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.data-tag {
  font-size: 12px;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: 6px;
  display: block;
}

.data-tag.filled {
  background: var(--black);
  color: var(--white);
}

.data-tag.empty {
  background: var(--border);
  color: var(--body-text);
  opacity: 0.5;
  text-decoration: line-through;
}

.data-col-footer {
  font-size: 11px;
  color: var(--body-text);
  font-weight: 600;
  margin-top: 4px;
}

.data-gap-arrow {
  font-size: 24px;
  color: var(--border);
  flex-shrink: 0;
}

.diagram-caption {
  font-size: 12px;
  color: var(--body-text);
  line-height: 1.5;
  font-style: italic;
  opacity: 0.7;
}

/* ===========================
   CITY CONCEPT DIAGRAM
   =========================== */

.city-concept-layout {
  align-items: center;
  grid-template-columns: 1fr 1.5fr;
}

.city-diagram-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.city-diagram-svg {
  width: 100%;
  max-width: 660px;
  height: auto;
  display: block;
}

/* Layers start invisible */
.cd-layer {
  opacity: 0;
  transition: opacity 0.8s ease;
}

.cd-layer.cd-visible {
  opacity: 1;
}

/* X marks: pop in with scale + opacity */
.cd-xmark {
  opacity: 0;
  transform: scale(0.4);
  transform-box: fill-box;
  transform-origin: center;
  transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.cd-xmark.cd-visible {
  opacity: 1;
  transform: scale(1);
}

/* Legend */
.city-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px 32px;
}

.city-legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--body-text);
}

.city-legend-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ===========================
   METHODOLOGY IMAGE
   =========================== */

.methodology-image-wrap {
  margin-top: 48px;
  border-radius: 12px;
  overflow: hidden;
  outline: 1px solid #e5e7eb;
}

.methodology-image {
  display: block;
  width: 100%;
  height: auto;
}

/* ===========================
   METHODOLOGY FLOW (legacy — kept for reference)
   =========================== */

.methodology-flow {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-top: 48px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.method-node {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 24px 20px;
  flex: 1;
  min-width: 180px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.method-node--active {
  background: var(--black);
}

.method-node--active .method-node-title,
.method-node--active .method-node-list li {
  color: var(--white);
}

.method-node-number {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--body-text);
  opacity: 0.5;
}

.method-node--active .method-node-number {
  color: rgba(255,255,255,0.4);
}

.method-node-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--black);
}

.method-node-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.method-node-list li {
  font-size: 12px;
  color: var(--body-text);
  padding-left: 10px;
  position: relative;
}

.method-node-list li::before {
  content: '·';
  position: absolute;
  left: 0;
}

.method-arrow {
  font-size: 20px;
  color: var(--border);
  padding: 0 8px;
  align-self: center;
  flex-shrink: 0;
}

/* ===========================
   THREE SCENARIOS
   =========================== */

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 48px;
}

.scenario-card {
  background: var(--bg-card);
  border-radius: var(--radius-card);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
}

.scenario-card--featured {
  background: var(--black);
  border: none;
}

.scenario-card--featured .scenario-number,
.scenario-card--featured .scenario-title,
.scenario-card--featured .scenario-desc,
.scenario-card--featured .scenario-fact span,
.scenario-card--featured .scenario-fact strong {
  color: var(--white);
}

.scenario-card--featured .scenario-fact {
  border-color: rgba(255,255,255,0.1);
}

.scenario-featured-label {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}

.scenario-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.scenario-number {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--body-text);
  opacity: 0.5;
}

.scenario-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--black);
}

.scenario-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--body-text);
}

/* Scenario diagrams */
.scenario-diagram {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 160px;
}

/* Scenario 1 — floors inside shell */
.sc-shell {
  width: 160px;
  height: 140px;
  border: 2.5px solid var(--black);
  border-radius: 4px;
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 8px;
}

.sc-shell--crossed {
  border-color: var(--body-text);
  opacity: 0.5;
}

.sc-label {
  position: absolute;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--body-text);
}

.sc-label--outer {
  top: -18px;
  left: 0;
}

.sc-label--inner {
  bottom: -18px;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  color: var(--white);
}

.sc-floors {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.sc-floor {
  height: 30px;
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.sc-floor--new {
  background: var(--black);
  color: var(--white);
}

/* Scenario 2 — envelope + cross */
.sc-envelope {
  width: 180px;
  height: 140px;
  border: 2.5px solid rgba(255,255,255,0.3);
  border-radius: 4px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sc-cross-wrap {
  position: relative;
  width: 110px;
  height: 85px;
}

.sc-cross {
  position: relative;
  width: 100%;
  height: 100%;
}

.sc-cross-h {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 28px;
  background: rgba(255,255,255,0.9);
  border-radius: 3px;
  transform: translateY(-50%);
}

.sc-cross-v {
  position: absolute;
  left: 50%;
  top: 0;
  width: 28px;
  height: 100%;
  background: rgba(255,255,255,0.9);
  border-radius: 3px;
  transform: translateX(-50%);
}

.sc-gap-label {
  position: absolute;
  bottom: 6px;
  right: 6px;
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.3);
}

/* Scenario 3 — crossed out */
.sc-cross-mark {
  position: absolute;
  inset: 12px;
}

.sc-x-line {
  position: absolute;
  width: 100%;
  height: 2px;
  background: #b91c1c;
  top: 50%;
  left: 0;
  border-radius: 1px;
}

.sc-x-line--1 {
  transform: translateY(-50%) rotate(35deg);
}

.sc-x-line--2 {
  transform: translateY(-50%) rotate(-35deg);
}

.sc-demolish-label {
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #b91c1c;
  white-space: nowrap;
}

/* Scenario facts */
.scenario-facts {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.scenario-fact {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding: 7px 0;
  border-bottom: 1px solid var(--border);
}

.scenario-fact:last-child {
  border-bottom: none;
}

.scenario-fact span {
  color: var(--body-text);
}

.scenario-fact strong {
  font-weight: 700;
  color: var(--black);
}

/* ===========================
   ECONOMIC TABLE
   =========================== */

.econ-table {
  background: var(--bg-card);
  border-radius: var(--radius-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.econ-group {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.econ-group:last-child {
  border-bottom: none;
}

.econ-group--output {
  background: var(--black);
}

.econ-group-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--body-text);
  margin-bottom: 12px;
}

.econ-group--output .econ-group-label {
  color: rgba(255,255,255,0.4);
}

.econ-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  padding: 5px 0;
}

.econ-name {
  color: var(--text);
}

.econ-group--output .econ-name,
.econ-group--output .econ-val {
  color: var(--white);
}

.econ-val {
  font-weight: 600;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
}

.econ-input { background: #dbeafe; color: #1e40af; }
.econ-calc  { background: var(--border); color: var(--text); }
.econ-output { background: rgba(255,255,255,0.12); color: var(--white); }

.econ-row--highlight .econ-name {
  font-weight: 700;
}

.econ-row--highlight .econ-val {
  background: rgba(255,255,255,0.2);
}

/* ===========================
   CASE STUDY
   =========================== */

.case-study-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
  margin-top: 40px;
}

.case-col {
  background: var(--bg-card);
  border-radius: var(--radius-card);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.case-col--output {
  background: var(--black);
}

.case-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--body-text);
  margin-bottom: 16px;
}

.case-col--output .case-label {
  color: rgba(255,255,255,0.4);
}

.case-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.case-row:last-child { border-bottom: none; }

.case-row span { color: var(--body-text); }
.case-row strong { font-weight: 700; color: var(--black); }

.case-col--output .case-row {
  border-color: rgba(255,255,255,0.1);
}

.case-col--output .case-row span,
.case-col--output .case-row strong {
  color: var(--white);
}

.case-row--sm {
  font-size: 12px;
  padding: 6px 0;
}

.case-output-number {
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--white);
  line-height: 1;
  margin-bottom: 4px;
}

.case-output-label {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 20px;
}

.verdict-tag {
  display: inline-block;
  background: #14532d;
  color: #86efac;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 99px;
}

/* ===========================
   PAGE CTA
   =========================== */

.rp-cta {
  padding: 100px 2rem;
  background: var(--bg-card);
}

.rp-cta-inner {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.rp-cta-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--black);
}

.rp-cta-sub {
  font-size: 16px;
  line-height: 1.7;
  color: var(--body-text);
  max-width: 580px;
}

.rp-cta-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 8px;
}

/* ===========================
   RESPONSIVE
   =========================== */

@media (max-width: 900px) {
  .rp-two-col {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .scenarios-grid {
    grid-template-columns: 1fr;
  }

  .case-study-grid {
    grid-template-columns: 1fr;
  }

  .methodology-flow {
    flex-direction: column;
    align-items: stretch;
  }

  .method-arrow {
    transform: rotate(90deg);
    align-self: center;
  }
}