/* --- Global Styles --- */
:root {
  --primary-teal: #4A9EE8;
  --dark-grey: #333;
  --medium-grey: #666;
  --light-grey: #f9fafb;
  --border-color: #e5e7eb;
  --font-main: 'Inter', 'Noto Sans KR', -apple-system,
               BlinkMacSystemFont, 'Segoe UI',
               Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font-main);
  color: var(--dark-grey);
  line-height: 1.7;
  background-color: #ffffff;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 30px;
}

/* --- Hero Section --- */
.hero {
  padding: 100px 0 60px;
  text-align: center;
  background: radial-gradient(circle at center, #ffffff 0%, #fcfcfc 100%);
  border-bottom: 1px solid var(--border-color);
}

.paper-title {
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 25px;
  letter-spacing: -0.5px;
}

.highlight {
  color: var(--primary-teal);
}

/* --- Authors & Affiliations --- */
.authors {
  font-size: 1.35rem;
  color: var(--dark-grey);
  margin-bottom: 10px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px 28px;
}

.authors a {
  color: var(--primary-teal);
  text-decoration: underline;
  text-decoration-color: rgba(74, 158, 232, 0.45);
  text-underline-offset: 3px;
  font-weight: 600;
  transition: color 0.2s, text-decoration-color 0.2s;
}

.authors a:hover {
  color: #2b7fd4;
  text-decoration-color: #2b7fd4;
}

.author-equal {
  color: var(--dark-grey);
  font-size: 0.8rem;
  vertical-align: super;
}

.author-aff {
  color: var(--dark-grey);
  font-size: 0.8rem;
  vertical-align: super;
}

.affiliations {
  font-size: 1.05rem;
  color: var(--medium-grey);
  margin-bottom: 4px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px 28px;
  font-weight: 500;
}

.affiliations span sup {
  color: var(--primary-teal);
}

.equal-note {
  font-size: 1.02rem;
  color: #aaa;
  margin-bottom: 28px;
}

.venue {
  font-size: 1.0rem;
  color: #999;
  font-weight: 500;
  margin-bottom: 40px;
}

.venue-badge {
  display: inline-block;
  background: #ffffff;
  color: var(--primary-teal);
  border: 1.5px solid #c8dff5;
  border-radius: 999px;
  padding: 8px 32px;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 40px;
}

.external-links {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: #111827;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  border: 1px solid rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow:
      inset 0 1px 0 rgba(255,255,255,0.15),
      0 6px 20px rgba(0,0,0,0.12);
  transition: all 0.25s ease;
}

.btn:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.14);
  box-shadow:
      inset 0 1px 0 rgba(255,255,255,0.25),
      0 12px 30px rgba(0,0,0,0.18);
  border-color: var(--primary-teal);
  color: var(--primary-teal);
}

/* --- Sections --- */
.section {
  padding: 80px 0;
  border-bottom: 1px solid #f0f0f0;
}

.section.light-grey {
  background-color: #ffffff;
  box-shadow: inset 0 20px 40px rgba(0,0,0,0.02), inset 0 -20px 40px rgba(0,0,0,0.02);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 50px;
}

.section-title::after {
  content: "";
  display: block;
  width: 50px;
  height: 4px;
  background-color: var(--primary-teal);
  margin: 15px auto 0;
}

/* --- Content Elements --- */
.abstract-box {
  background: #fff;
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
  border: 1px solid var(--border-color);
  text-align: justify;
  font-size: 1.1rem;
}

.paragraph {
  margin-bottom: 20px;
  font-size: 1.05rem;
  text-align: justify;
}

/* --- Figure & Image Control --- */
.figure-container {
  text-align: center;
  margin: 40px 0;
}

.responsive-img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}

.small-width {
  max-width: 75%;
  margin: 0 auto;
}

.border-img {
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.caption {
  font-size: 0.9rem;
  color: var(--medium-grey);
  margin-top: 15px;
  font-style: italic;
  padding: 0 10%;
}

/* --- Grid & Cards --- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-top: 40px;
}

.card {
  background: #fff;
  padding: 30px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: transform 0.2s ease;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-teal);
}

.card h3 {
  color: var(--primary-teal);
  font-size: 1.3rem;
  margin-bottom: 15px;
}

.highlight-box {
  background: #f0fdfa;
  padding: 30px;
  border-radius: 12px;
  border-left: 5px solid var(--primary-teal);
  margin-top: 40px;
}

.highlight-box h4 {
  margin-bottom: 15px;
  color: var(--primary-teal);
}

.highlight-box ul {
  padding-left: 20px;
}

.highlight-box li {
  margin-bottom: 10px;
}

.figure-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 50px;
  margin: 40px 0;
}

.figure-row .figure-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
}

.figure-row .figure-container:first-child {
  flex: 1.25;
}

.figure-row .figure-container:last-child {
  flex: 0.9;
}

.figure-row img {
  width: 100%;
  object-fit: contain;
}

.figure-row .caption {
  padding: 0 4%;
  margin-top: 15px;
}

@media (max-width: 768px) {
  .figure-row {
      flex-direction: column;
  }
}

/* --- Results Tables --- */
.results-table-wrap {
  margin: 30px 0;
  overflow-x: auto;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
  border: 1px solid var(--border-color);
}

.results-table th {
  background: #f9fafb;
  color: var(--medium-grey);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 12px 16px;
  text-align: center;
  border-bottom: 2px solid var(--border-color);
}

.results-table th:first-child {
  text-align: left;
}

.results-table td {
  padding: 10px 16px;
  text-align: center;
  border-bottom: 1px solid #f3f4f6;
  color: var(--dark-grey);
}

.results-table td:first-child {
  text-align: left;
  font-weight: 500;
}

.results-table tr:last-child td {
  border-bottom: none;
}

.results-table tr:hover td {
  background: #fafffe;
}

.results-table .section-group th {
  background: #f0fdfa;
  color: var(--primary-teal);
  font-size: 0.8rem;
  border-bottom: 1px solid #b2dfdb;
  border-top: 1px solid var(--border-color);
}

.results-table .row-ours td {
  background: #f0fdfa;
  font-weight: 600;
  color: #007a6e;
}

.results-table .row-ours td:first-child {
  color: var(--primary-teal);
}

.td-best {
  font-weight: 700;
  color: var(--primary-teal) !important;
}

.td-second {
  text-decoration: underline;
  text-decoration-style: dotted;
}

/* --- Tabs --- */
.tab-group {
  margin: 32px 0 0 0;
}

.tab-buttons {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 0;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0;
}

.tab-btn {
  padding: 9px 22px;
  border: 1px solid var(--border-color);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  background: #f9fafb;
  color: var(--medium-grey);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-main);
  position: relative;
  top: 2px;
}

.tab-btn.active, .tab-btn:hover {
  background: #fff;
  color: var(--primary-teal);
  border-color: var(--border-color);
  border-bottom-color: #fff;
}

.tab-btn.active {
  border-bottom-color: #fff;
  z-index: 1;
}

.tab-panel {
  display: none;
  border: 1px solid var(--border-color);
  border-top: none;
  border-radius: 0 0 12px 12px;
  padding: 24px;
  background: #fff;
}

.tab-panel.active {
  display: block;
}

/* --- BibTeX --- */
.bibtex-box {
  background-color: #ffffff;
  color: var(--dark-grey);
  padding: 25px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  font-family: 'Roboto Mono', monospace;
  font-size: 0.9rem;
  overflow-x: auto;
  line-height: 1.8;
}

/* --- Footer --- */
.footer {
  padding: 60px 0;
  text-align: center;
  color: #999;
  font-size: 0.9rem;
}

/* --- Mobile Responsive --- */
@media (max-width: 768px) {
  .paper-title { font-size: 2rem; }
  .grid-2 { grid-template-columns: 1fr; }
  .small-width { max-width: 100%; }
}