/* Research portfolio page — from assets/html/index-future(학술자산).html */

.research-page {
  --ink: #14171f;
  --ink-2: #2b3240;
  --muted: #6b7280;
  --line: #e4e1da;
  --paper: #fbf9f4;
  --paper-2: #f5f1e8;
  --navy: #0a2540;
  --blue: #0052cc;
  --gold: #b89d5a;
  --green-paper: #556b45;
  --red-blood: #8b2635;
  --sage: #687a6b;
  --future-purple: #6b46c1;
  --future-bg: #f4f0fb;
  --new-highlight: #fff9e6;
  --published: #1f7a1f;
  --review-orange: #d08744;
  --cat-nold: #556b45;
  --cat-rehab: #0052cc;

  font-family:
    'Pretendard',
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  word-break: keep-all;
  overflow-x: clip;
}

.research-page,
.research-page *,
.research-page *::before,
.research-page *::after {
  box-sizing: border-box;
}

.research-page em,
.research-page cite,
.research-page i,
.research-page blockquote {
  font-style: normal;
}

.research-page .term-fraunces,
.research-page .faq-cta-eyebrow {
  font-family: 'Fraunces', serif;
  font-style: normal;
}

.research-page.paper-texture {
  position: relative;
}

.research-page.paper-texture::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(59, 45, 26, 0.018) 1px, transparent 1px);
  background-size: 4px 4px;
  pointer-events: none;
  z-index: 0;
}

.research-page.paper-texture > * {
  position: relative;
  z-index: 1;
}

.research-page .container {
  position: relative;
  max-width: 1400px;
  margin: 0 auto;
}

/* ============ Article meta strip ============ */
.research-page .article-meta {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
  background: rgba(251, 249, 244, 0.6);
}

.research-page .article-meta .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
}

.research-page .article-meta .breadcrumb a {
  color: var(--muted);
}

.research-page .article-meta .breadcrumb a:hover {
  color: var(--navy);
}

.research-page .article-meta-sep {
  color: var(--line);
  margin: 0 10px;
}

.research-page .article-meta-current {
  color: var(--ink-2);
}

.research-page .article-meta-credit {
  color: var(--muted);
  font-size: 13px;
}

/* ============ Delta markers ============ */
.research-page .delta-section {
  position: relative;
}

.research-page .delta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: -8px;
  bottom: 0;
  width: 3px;
  background: var(--future-purple);
  opacity: 0.3;
}

/* ============ Hero ============ */
.research-page .hero {
  padding: 80px 0 56px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  position: relative;
}

.research-page .hero-inner {
  position: relative;
}

.research-page .hero .eyebrow {
  display: block;
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 13px;
  color: var(--sage);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 18px;
  font-weight: 600;
}

.research-page .hero h1 {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: clamp(40px, 6vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.035em;
  color: var(--navy);
  margin-bottom: 22px;
  font-weight: 600;
  max-width: 1000px;
}

.research-page .hero h1 em {
  font-style: normal;
  color: var(--sage);
}

.research-page .hero p.lede {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 19px;
  line-height: 1.65;
  color: var(--ink-2);
  max-width: 880px;
  margin-bottom: 36px;
}

.research-page .hero p.lede strong {
  color: var(--navy);
  font-weight: 600;
}

.research-page .hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(10, 37, 64, 0.05);
}

.research-page .stat-cell {
  padding: 24px 26px;
  border-right: 1px solid var(--line);
  position: relative;
}

.research-page .stat-cell:last-child {
  border-right: none;
}

.research-page .stat-cell.updated {
  background: linear-gradient(180deg, var(--new-highlight), #fff);
}

.research-page .stat-cell .n {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 44px;
  line-height: 1;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: -0.03em;
  margin-bottom: 6px;
}

.research-page .stat-cell .n em {
  font-style: normal;
  color: var(--sage);
}

.research-page .stat-cell .stat-sup {
  font-size: 28px;
  font-style: normal;
}

.research-page .stat-cell .stat-sup-purple {
  color: var(--sage);
}

.research-page .stat-cell .stat-sup-muted {
  color: var(--muted);
}

.research-page .stat-cell .l {
  font-size: 13px;
  color: var(--ink-2);
  line-height: 1.5;
}

.research-page .stat-cell .delta {
  display: inline-block;
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 13px;
  color: var(--sage);
  margin-top: 6px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

@media (max-width: 900px) {
  .research-page .hero {
    padding: 48px 0 56px;
  }

  .research-page .hero-stats {
    grid-template-columns: 1fr 1fr;
  }

  .research-page .stat-cell {
    border-right: none;
    border-bottom: none;
  }

  .research-page .stat-cell:nth-child(odd) {
    border-right: 1px solid var(--line);
  }

  .research-page .stat-cell:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .research-page .research-origin-section {
    padding: 72px 0;
  }

  .research-page .section-head {
    margin-bottom: 48px;
  }

  .research-page .research-portfolio-section {
    padding: 56px 0 80px;
  }

  body.research-archive .main-nav {
    background: rgba(251, 249, 244, 0.92);
  }
}

/* ============ Origin cards ============ */
.research-page .research-origin-section {
  padding: 120px 0;
  border-bottom: 1px solid var(--line);
}

.research-page .section-head {
  text-align: center; 
  margin-bottom: 100px;
}

.research-page .section-eyebrow {
  font-size: 13px;
  font-weight: 500;
  color: var(--navy);
  letter-spacing: 0.2em;
  text-align: center;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.research-page .section-title {
  font-size: clamp(38px, 4vw, 52px);
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.025em;
  line-height: 1.2;
  text-align: center;
  margin-bottom: 0;
}

.research-page .section-title em {
  font-style: normal;
  color: var(--navy);
  font-weight: 400;
}

.research-page .origin-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.research-page .origin-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 36px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s;
  color: inherit;
  text-decoration: none;
}

.research-page .origin-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(10, 37, 64, 0.08);
  border-color: var(--navy);
  color: inherit;
  text-decoration: none;
}

.research-page .origin-card-cct {
  background: linear-gradient(180deg, #f0f9f0, #fff);
  border-color: var(--published);
}

.research-page .origin-card-label {
  font-size: 13px;
  color: var(--navy);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 16px;
  font-weight: 600;
}

.research-page .origin-card-label-cct {
  color: var(--sage);
}

.research-page .origin-card-title {
  margin-bottom: 20px;
  font-size: clamp(48px, 5vw, 72px);
  font-weight: 400;
  color: var(--navy);
  letter-spacing: -0.03em;
  line-height: 1;
}

.research-page .origin-card-title strong {
  font-weight: 600;
}

.research-page .origin-card-tagline {
  font-size: 20px;
  font-weight: 600;
  color: var(--ink-2);
  margin-bottom: 20px;
}

.research-page .origin-card-tagline em {
  color: var(--navy);
}

.research-page .origin-card-tagline em.green {
  color: var(--sage);
}

.research-page .origin-card-desc {
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-2);
  margin-bottom: 22px;
  flex: 1;
}

.research-page .origin-card-cite {
  font-size: 13px;
  color: var(--muted);
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

.research-page .origin-card-cite .term-fraunces {
  color: var(--navy);
}

.research-page .origin-card-cite span {
  display: block;
  font-size: 13px;
  color: var(--ink-2);
  margin-top: 4px;
}

/* ============ Category bar ============ */
.research-page .research-category-bar {
  background: rgba(245, 241, 232, 0.95);
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
  position: sticky;
  top: 67px;
  z-index: 50;
  backdrop-filter: blur(8px);
}

.research-page .research-category-bar .container {
  display: flex;
  align-items: center;
  gap: 10px;
}

.research-page .research-category-bar-scroll {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}

.research-page .research-category-bar-scroll::-webkit-scrollbar {
  display: none;
}

.research-page .research-category-bar-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: nowrap;
  width: max-content;
}

.research-page .research-cat-label {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 600;
  flex-shrink: 0;
}

.research-page .research-cat-btn {
  background: #fff;
  border: 1px solid var(--line);
  padding: 9px 16px;
  border-radius: 20px;
  font-size: 13px;
  color: var(--ink-2);
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 500;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
  white-space: nowrap;
}

.research-page .research-cat-btn:hover {
  border-color: var(--navy);
}

.research-page .research-cat-btn.active {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

.research-page .research-cat-btn .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}

.research-page .research-cat-btn[data-cat='nold'] .dot {
  background: var(--sage);
}

.research-page .research-cat-btn[data-cat='rehab'] .dot {
  background: var(--cat-rehab);
}

.research-page .research-cat-btn .count {
  font-size: 13px;
  opacity: 0.7;
}

/* ============ Portfolio grid ============ */
.research-page .research-portfolio-section {
  padding: 72px 0 100px;
  background: var(--paper-2);
  position: relative;
}

.research-page .research-portfolio-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--future-purple), var(--gold), var(--green-paper));
}

.research-page .research-portfolio-section .section-head {
  text-align: left;
  margin-bottom: 36px;
}

.research-page .research-portfolio-section .section-eyebrow.future {
  color: var(--sage);
}

.research-page .research-portfolio-section .section-title {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 600;
  text-align: left;
  margin-bottom: 14px;
}

.research-page .research-portfolio-section .section-title em {
  font-family: 'Fraunces', serif;
  font-style: normal;
  text-transform: uppercase;
  color: var(--sage);
}

.research-page .research-portfolio-section .section-sub {
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.7;
  max-width: 740px;
  margin: 0;
}

.research-page .portfolio-intro {
  background: var(--future-bg);
  border-left: 3px solid var(--future-purple);
  padding: 24px 28px;
  border-radius: 6px;
  margin-bottom: 36px;
}

.research-page .portfolio-intro p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-2);
  margin: 0;
}

.research-page .portfolio-intro strong {
  color: var(--navy);
  font-weight: 700;
}

.research-page .portfolio-intro code {
  font-size: 13px;
  background: var(--paper-2);
  padding: 1px 5px;
  border-radius: 3px;
}

.research-page .portfolio-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.research-page .paper-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s;
  position: relative;
  color: inherit;
  text-decoration: none;
}

.research-page .paper-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(10, 37, 64, 0.08);
  color: inherit;
  text-decoration: none;
}

.research-page .paper-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  border-radius: 10px 10px 0 0;
}

.research-page .paper-card.nlbd::before,
.research-page .paper-card.nffd::before {
  background: var(--green-paper);
}

.research-page .paper-card.cct::before {
  background: var(--sage);
}

.research-page .paper-card.cortical::before {
  background: var(--navy);
}

.research-page .paper-card.ymj::before {
  background: var(--gold);
}

.research-page .paper-card.bird::before {
  background: var(--red-blood);
}

.research-page .paper-card.biomech::before {
  background: var(--sage);
}

.research-page .paper-card-exploratory {
  border-style: dashed;
  opacity: 0.7;
}

.research-page .pp-flag {
  font-size: 13px;
  letter-spacing: 0.12em;
  font-weight: 700;
  color: var(--sage);
  margin-bottom: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.research-page .pp-flag.review {
  color: var(--review-orange);
}

.research-page .pp-flag.exploratory {
  color: var(--muted);
}

.research-page .pp-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 4px;
  letter-spacing: -0.02em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.research-page .pp-title-muted {
  color: var(--muted);
}

.research-page .pp-title-note {
  font-size: 14px;
  color: var(--muted);
}

.research-page .pp-journal {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 12px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
}

.research-page .pp-journal-muted {
  color: var(--muted);
}

.research-page .paper-card p {
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
}

.research-page .pp-doi {
  font-size: 13px;
  color: var(--navy);
  letter-spacing: 0.03em;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.research-page .pp-doi-muted {
  color: var(--muted);
}

.research-page .research-empty {
  text-align: center;
  color: var(--muted);
  font-size: 16px;
  padding: 48px 0;
}

.research-page .exploratory-callout {
  margin-top: 56px;
  padding: 24px 28px;
  background: var(--paper);
  border: 1px dashed var(--muted);
  border-radius: 8px;
}

.research-page .exploratory-callout-tag {
  font-size: 13px;
  letter-spacing: 0.15em;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 8px;
}

.research-page .exploratory-callout-title {
  font-size: 17px;
  color: var(--navy);
  margin-bottom: 6px;
  font-weight: 600;
}

.research-page .exploratory-callout p {
  font-size: 13px;
  color: var(--ink-2);
  line-height: 1.65;
  margin: 0;
}

/* ============ CTA (page-faq.php 기준) ============ */
.research-page .faq-cta {
  padding: 96px 0;
  text-align: center;
  background: var(--navy);
  color: var(--paper);
}

.research-page .faq-cta-eyebrow {
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.research-page .faq-cta-title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: #fff;
  margin: 0 auto 20px;
}

.research-page .faq-cta-title em {
  color: var(--gold);
}

.research-page .faq-cta-sub {
  font-size: 18px;
  color: rgba(251, 249, 244, 0.75);
  margin: 0 auto 36px;
  line-height: 1.65;
}

.research-page .faq-cta-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.research-page .faq-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 28px;
  font-size: 18px;
  font-weight: 700;
  border-radius: 4px;
  transition: all 0.2s;
  text-decoration: none;
}

.research-page .faq-cta-btn-primary {
  background: var(--gold);
  color: var(--navy) !important;
}

.research-page .faq-cta-btn-primary:hover {
  background: #c9af70;
  color: var(--navy) !important;
}

.research-page .faq-cta-btn-ghost {
  background: transparent;
  color: #fff !important;
  border: 1px solid rgba(251, 249, 244, 0.3);
}

.research-page .faq-cta-btn-ghost:hover {
  border-color: var(--gold);
  color: var(--gold) !important;
}

body.research-archive .site-header {
  background: rgba(251, 249, 244, 0.92);
}

@media (max-width: 1100px) {
  .research-page .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============ Tablet & mobile layout (page-nold.css 기준) ============ */
@media (max-width: 768px) {
  .research-page .article-meta .container {
    flex-direction: column;
    align-items: flex-start;
    font-size: 13px;
    gap: 8px;
    letter-spacing: 0.06em;
  }

  .research-page .breadcrumb {
    line-height: 1.5;
  }

  .research-page .delta-section::before {
    display: none;
  }

  .research-page .hero {
    padding: 40px 0 56px;
  }

  .research-page .hero .eyebrow {
    letter-spacing: 0.12em;
    margin-bottom: 14px;
    font-size: 12px;
    line-height: 1.5;
  }

  .research-page .hero h1 {
    font-size: clamp(28px, 7.5vw, 40px);
    margin-bottom: 18px;
  }

  .research-page .hero p.lede {
    font-size: 16px;
    line-height: 1.65;
    margin-bottom: 28px;
  }

  .research-page .stat-cell {
    padding: 20px 16px;
  }

  .research-page .stat-cell .n {
    font-size: clamp(28px, 8vw, 36px);
  }

  .research-page .stat-cell .stat-sup {
    font-size: 20px;
  }

  .research-page .stat-cell .l,
  .research-page .stat-cell .delta {
    font-size: 12px;
  }

  .research-page .research-origin-section {
    padding: 56px 0;
  }

  .research-page .section-head {
    margin-bottom: 40px;
  }

  .research-page .section-eyebrow {
    letter-spacing: 0.14em;
    font-size: 12px;
  }

  .research-page .section-title {
    font-size: clamp(28px, 7.5vw, 40px);
  }

  .research-page .origin-grid {
    grid-template-columns: 1fr;
  }

  .research-page .origin-card {
    padding: 24px 20px;
  }

  .research-page .origin-card:hover {
    transform: none;
  }

  .research-page .origin-card-title {
    font-size: clamp(40px, 12vw, 56px);
  }

  .research-page .origin-card-tagline {
    font-size: 18px;
    margin-bottom: 16px;
  }

  .research-page .origin-card-desc {
    font-size: 15px;
    line-height: 1.65;
    margin-bottom: 18px;
  }

  .research-page .origin-card-cite {
    padding-top: 14px;
    font-size: 12px;
  }

  .research-page .research-category-bar {
    padding: 16px 0;
    top: 60px;
  }

  .research-page .research-category-bar .container {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .research-page .research-category-bar-scroll {
    width: 100%;
    align-self: stretch;
  }

  .research-page .research-category-bar-inner {
    gap: 8px;
  }

  .research-page .research-cat-label {
    font-size: 11px;
  }

  .research-page .research-cat-btn {
    padding: 8px 14px;
    font-size: 12px;
  }

  .research-page .research-portfolio-section {
    padding: 48px 0 72px;
  }

  .research-page .research-portfolio-section .section-head {
    margin-bottom: 28px;
  }

  .research-page .research-portfolio-section .section-sub {
    font-size: 14px;
    line-height: 1.65;
  }

  .research-page .portfolio-grid {
    gap: 14px;
  }

  .research-page .paper-card {
    padding: 22px 18px;
  }

  .research-page .paper-card:hover {
    transform: none;
  }

  .research-page .pp-title {
    font-size: 18px;
    white-space: normal;
    overflow: visible;
    text-overflow: unset;
  }

  .research-page .pp-flag {
    font-size: 11px;
    white-space: normal;
  }

  .research-page .pp-journal {
    font-size: 13px;
  }

  .research-page .paper-card p {
    font-size: 13px;
    -webkit-line-clamp: 3;
  }

  .research-page .pp-doi {
    font-size: 11px;
    white-space: normal;
    word-break: break-all;
  }

  .research-page .exploratory-callout {
    margin-top: 40px;
    padding: 20px 18px;
  }

  .research-page .faq-cta {
    padding: 64px 0;
  }

  .research-page .faq-cta-sub {
    font-size: 16px;
    margin-bottom: 28px;
  }

  .research-page .faq-cta-buttons {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .research-page .faq-cta-btn {
    justify-content: center;
    width: 100%;
    padding: 16px 24px;
    font-size: 16px;
  }
}

@media (max-width: 540px) {
  .research-page .portfolio-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .research-page .hero-stats {
    grid-template-columns: 1fr;
  }

  .research-page .stat-cell {
    border-right: none !important;
    border-bottom: 1px solid var(--line);
  }

  .research-page .stat-cell:last-child {
    border-bottom: none;
  }
}

/* Override shared site.css section defaults within research layout */
.research-page .section-eyebrow::before,
.research-page .section-eyebrow::after {
  content: none;
  margin: 0;
}