/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #555555;
  --color-accent: #2e7d32;
  --color-accent-light: #e8f5e9;
  --color-border: #e0e0e0;
  --color-badge-bg: #2e7d32;
  --color-badge-text: #ffffff;
  --color-table-header: #f5f5f5;
  --color-table-stripe: #fafafa;
  --color-link: #1565c0;
  --font-serif: 'Noto Serif', 'Georgia', serif;
  --font-sans: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --max-width: 860px;
  --section-spacing: 3.5rem;
}

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ===== Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== Header / Hero ===== */
.hero {
  text-align: center;
  padding: 4rem 0 2rem;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 1.4rem;
  letter-spacing: -0.01em;
}

.hero__authors {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.hero__authors a {
  color: var(--color-text);
  text-decoration: none;
}

.hero__authors a:hover {
  text-decoration: underline;
}

.hero__affiliations {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.2rem;
  line-height: 1.6;
}

.hero__badge {
  display: inline-block;
  background: var(--color-badge-bg);
  color: var(--color-badge-text);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.35rem 1rem;
  border-radius: 3px;
  letter-spacing: 0.03em;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

.hero__links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.hero__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  padding: 0.5rem 1.1rem;
  border: 1.5px solid var(--color-border);
  border-radius: 4px;
  transition: border-color 0.2s, background 0.2s;
}

.hero__link:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

.hero__link svg {
  width: 16px;
  height: 16px;
}

.hero__link--disabled {
  opacity: 0.4;
  cursor: default;
  pointer-events: none;
}

.hero__coming-soon {
  margin-top: 0.6rem;
  font-size: 0.82rem;
  color: #999;
  font-style: italic;
}

/* ===== Divider ===== */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--section-spacing) 0;
}

/* ===== Sections ===== */
.section {
  margin-bottom: var(--section-spacing);
}

.section__title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.section__subtitle {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
  color: var(--color-text);
}

/* ===== Abstract ===== */
.abstract__text {
  font-size: 0.98rem;
  text-align: justify;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ===== Highlights ===== */
.highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.highlight-card {
  text-align: center;
  padding: 1.2rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-table-stripe);
}

.highlight-card__number {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-accent);
  display: block;
}

.highlight-card__label {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  margin-top: 0.25rem;
}

/* ===== Figures ===== */
.figure {
  margin: 2rem 0;
  text-align: center;
}

.figure img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.figure__caption {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 0.8rem;
  line-height: 1.6;
  text-align: left;
  font-style: italic;
}

.figure--wide {
  margin-left: -2rem;
  margin-right: -2rem;
}

.figure--wide img {
  max-width: calc(100% + 4rem);
  width: calc(100% + 4rem);
}

/* ===== Table ===== */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
  border-radius: 6px;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  white-space: nowrap;
}

.results-table thead {
  background: var(--color-table-header);
}

.results-table th {
  padding: 0.65rem 0.8rem;
  text-align: center;
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
  font-size: 0.8rem;
}

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

.results-table td {
  padding: 0.55rem 0.8rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.results-table td:first-child {
  text-align: left;
  font-weight: 500;
  font-family: 'SF Mono', 'Consolas', monospace;
  font-size: 0.8rem;
}

.results-table tbody tr:nth-child(even) {
  background: var(--color-table-stripe);
}

.results-table tbody tr:hover {
  background: var(--color-accent-light);
}

.results-table .best {
  font-weight: 700;
  color: var(--color-accent);
}

.table-caption {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 0.6rem;
  line-height: 1.5;
  font-style: italic;
}

/* ===== Column header groups ===== */
.results-table .col-group {
  text-align: center;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: 0.4rem 0.8rem;
}

/* ===== Contributions list ===== */
.contributions-list {
  list-style: none;
  padding: 0;
  margin-top: 1rem;
}

.contributions-list li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.8rem;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.contributions-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 7px;
  height: 7px;
  background: var(--color-accent);
  border-radius: 50%;
}

.contributions-list li strong {
  color: var(--color-text);
}

/* ===== Key Findings ===== */
.findings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.findings-grid .figure {
  margin: 0;
}

/* ===== Bibtex ===== */
.bibtex-block {
  background: #f8f8f8;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1.2rem 1.4rem;
  font-family: 'SF Mono', 'Consolas', 'Courier New', monospace;
  font-size: 0.78rem;
  line-height: 1.6;
  overflow-x: auto;
  position: relative;
  white-space: pre;
  color: var(--color-text-secondary);
}

.bibtex-copy {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.3rem 0.7rem;
  font-size: 0.75rem;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: background 0.2s;
}

.bibtex-copy:hover {
  background: var(--color-accent-light);
}

.bibtex-copy.copied {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem 0 3rem;
  font-size: 0.8rem;
  color: #999;
  border-top: 1px solid var(--color-border);
}

.footer a {
  color: var(--color-link);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero__title {
    font-size: 1.55rem;
  }

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

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

  .figure--wide {
    margin-left: 0;
    margin-right: 0;
  }

  .figure--wide img {
    max-width: 100%;
    width: 100%;
  }

  .results-table {
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: 1.35rem;
  }

  .hero__links {
    flex-direction: column;
    align-items: center;
  }

  .container {
    padding: 0 1rem;
  }
}