/* Basic reset and typography */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth; /* Smooth scrolling for in-page anchors */
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #222222;
  background-color: #f6f7fb;
  line-height: 1.6;
}

/* Header styles */
.site-header {
  background: #ffffff;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.75rem 1.25rem 1.75rem;
  text-align: center;
}

.paper-title {
  margin: 0 0 0.25rem;
  font-size: 2.2rem;
  font-weight: 600;
}

.paper-author {
  margin: 0 0 0.25rem;
  font-size: 0.95rem;
  color: #555555;
}

.paper-tagline {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  color: #444444;
}

/* Top navigation */
.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.9rem;
  margin-top: 1.25rem;
  justify-content: center;
}

.top-nav a {
  text-decoration: none;
  color: #1f4f8b;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.top-nav a:hover,
.top-nav a:focus-visible {
  background-color: #e4eefb;
  color: #103864;
}

/* Main content layout */
.content {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

/* Sections */
.section {
  margin-top: 3rem;
  scroll-margin-top: 5.5rem; /* so anchors land with nice spacing below sticky header */
}

.section:first-of-type {
  margin-top: 2rem;
}

.section h2 {
  font-size: 1.4rem;
  margin: 0 0 0.75rem;
  color: #1f2a3c;
}

.section h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: #1f2a3c;
}

.section p {
  margin: 0 0 0.75rem;
}

/* Lists */
.section ul {
  padding-left: 1.2rem;
  margin-top: 0.25rem;
}

.section li {
  margin-bottom: 0.3rem;
}

/* Case cards for listening examples */
.case-card {
  margin-top: 1.5rem;
  padding: 1.25rem 1rem 1.25rem;
  background-color: #ffffff;
  border-radius: 0.75rem;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.04);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.case-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.case-card h3 {
  margin-top: 0;
}

.case-description {
  font-size: 0.9rem;
  color: #555555;
}

/* Audio layout */
.audio-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.lambda-audio-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.audio-item {
  display: flex;
  flex-direction: column;
  padding: 0.65rem 0.7rem 0.75rem;
  background-color: #f9fafc;
  border-radius: 0.6rem;
  border: 1px solid rgba(15, 23, 42, 0.06);
}

.audio-label {
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.35rem;
  color: #1f2a3c;
}

audio {
  width: 100%;
}

/* Lambda notes list */
.lambda-notes {
  margin-top: 0.9rem;
}

/* Metrics table */
.table-wrapper {
  margin-top: 1rem;
  overflow-x: auto;
}

.metrics-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
  background-color: #ffffff;
  border-radius: 0.6rem;
  overflow: hidden;
  font-size: 0.9rem;
}

.metrics-table thead {
  background-color: #f0f3fa;
}

.metrics-table th,
.metrics-table td {
  padding: 0.6rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.metrics-table th {
  font-weight: 600;
  color: #1f2a3c;
}

.metrics-table tbody tr:nth-child(even) {
  background-color: #fafbff;
}

/* Links in Paper & Code section */
.links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0.75rem 0 0.5rem;
}

.primary-link,
.secondary-link {
  display: inline-block;
  font-size: 0.9rem;
  text-decoration: none;
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.primary-link {
  background-color: #1f4f8b;
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(15, 23, 42, 0.18);
}

.primary-link:hover,
.primary-link:focus-visible {
  background-color: #153a66;
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.24);
}

.secondary-link {
  background-color: #ffffff;
  color: #1f4f8b;
  border: 1px solid #1f4f8b;
}

.secondary-link:hover,
.secondary-link:focus-visible {
  background-color: #e4eefb;
}

/* Contact line */
.contact-line {
  font-size: 0.9rem;
  color: #444444;
}

.contact-line a {
  color: #1f4f8b;
  text-decoration: none;
}

.contact-line a:hover,
.contact-line a:focus-visible {
  text-decoration: underline;
}

/* Footer */
.site-footer {
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  padding: 1rem 1.25rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: #666666;
  background-color: #ffffff;
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .paper-title {
    font-size: 1.4rem;
  }

  .header-inner {
    padding-inline: 1rem;
  }

  .content {
    padding-inline: 1rem;
  }
}

@media (max-width: 720px) {
  .audio-grid,
  .lambda-audio-grid {
    grid-template-columns: 1fr;
  }

  .metrics-table {
    min-width: 0;
    font-size: 0.85rem;
  }
}

@media (max-width: 540px) {
  .top-nav {
    gap: 0.4rem;
  }

  .top-nav a {
    padding-inline: 0.5rem;
    font-size: 0.8rem;
  }
}