:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --ink: #16212e;
  --muted: #4d5e72;
  --line: #d7e0ea;
  --accent: #1a69d9;
  --accent-soft: #e9f0ff;
  --shadow: 0 12px 30px rgba(28, 49, 76, 0.1);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", "Noto Sans", sans-serif;
  line-height: 1.45;
}

a {
  color: inherit;
}

.container {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 247, 251, 0.94);
  backdrop-filter: blur(7px);
}

.header-row {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.6rem 0;
}

.brand-kicker {
  margin: 0 0 0.15rem;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.brand-title {
  margin: 0;
  font-size: 1.16rem;
}

.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.section-nav a {
  text-decoration: none;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  font-size: 0.82rem;
  color: #29415f;
}

.section-nav a:hover,
.section-nav a:focus-visible {
  border-color: #98b5dd;
  background: #f0f5ff;
}

.hero {
  padding: 2rem 0 0.5rem;
}

.hero-card {
  position: relative;
  background:
    radial-gradient(circle at 14% 22%, #dce9ff 0%, rgba(220, 233, 255, 0.1) 46%),
    radial-gradient(circle at 86% 72%, #ffeccf 0%, rgba(255, 236, 207, 0.1) 42%),
    var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 1.55rem 1.35rem;
}

.hero-card h2 {
  margin: 0 0 0.35rem;
  font-size: clamp(1.35rem, 2vw + 0.8rem, 2.05rem);
  text-align: center;
}

.hero-authors {
  margin: 0.72rem auto 0.92rem;
  text-align: center;
}

.hero-author-line {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: #1f3852;
}

.hero-affiliation-line {
  margin: 0.2rem 0 0;
  font-size: 0.86rem;
  color: #4b6078;
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  column-gap: 0.52rem;
  white-space: nowrap;
}

.hero-authors sup {
  font-size: 0.72em;
  line-height: 1;
  vertical-align: super;
}

.affiliation-item {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
}

.affiliation-logo {
  display: block;
  flex: 0 0 auto;
  max-height: 0.98rem;
  width: auto;
}

.sapienza-logo {
  max-height: 1.03rem;
}

.paradigma-logo {
  max-height: 0.92rem;
}

.affiliation-separator {
  color: #6c7f95;
}

.hero-abstract {
  margin-top: 0.8rem;
}

.hero-abstract.hero-meta {
  margin-top: 1.7rem;
}

.hero-abstract-title {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
  color: #35506d;
}

.hero-abstract-text {
  margin: 0.45rem auto 0;
  color: #304861;
  max-width: 88ch;
  font-size: 0.95rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  justify-content: center;
  margin-top: 0.9rem;
  position: relative;
}

.hero-link,
.ghost-button {
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 0.55rem 0.85rem;
  font-size: 0.9rem;
  text-decoration: none;
  background: var(--surface);
  cursor: pointer;
}

.citation-action {
  position: relative;
}

.action-button {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  line-height: 1;
}

.action-icon {
  width: 0.95rem;
  height: 0.95rem;
  flex: 0 0 auto;
}

.hero-link {
  border-color: #8eb0df;
  background: var(--accent-soft);
  color: #12458f;
}

.ghost-button:hover,
.ghost-button:focus-visible,
.hero-link:hover,
.hero-link:focus-visible {
  filter: brightness(0.98);
}

.citation-popup {
  position: absolute;
  top: calc(100% + 0.55rem);
  right: 0;
  z-index: 30;
  width: min(28rem, calc(100vw - 2rem));
  border: 1px solid #c7d4e4;
  border-radius: 12px;
  background: #ffffff;
  box-shadow: 0 18px 45px rgba(28, 49, 76, 0.16);
  padding: 0.8rem;
  text-align: left;
}

.citation-popup::before {
  content: "";
  position: absolute;
  top: -7px;
  right: 1.15rem;
  width: 12px;
  height: 12px;
  border-left: 1px solid #c7d4e4;
  border-top: 1px solid #c7d4e4;
  background: #ffffff;
  transform: rotate(45deg);
}

.citation-popup-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  margin-bottom: 0.55rem;
}

.citation-popup-head h3 {
  margin: 0;
  color: #263b54;
  font-size: 0.86rem;
}

.copy-citation-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid #c7d4e4;
  border-radius: 9px;
  background: #f8fbff;
  color: #1d4f91;
  cursor: pointer;
}

.copy-citation-button:hover,
.copy-citation-button:focus-visible {
  background: #eef5ff;
  border-color: #9fb9db;
}

.copy-icon {
  width: 1rem;
  height: 1rem;
}

.citation-code {
  margin: 0;
  max-height: 17rem;
  overflow: auto;
  border: 1px solid #d9e3ef;
  border-radius: 9px;
  background: #f8fafd;
  color: #20344c;
  padding: 0.7rem;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  line-height: 1.45;
  white-space: pre;
}

.citation-copy-status {
  min-height: 1.05rem;
  margin: 0.45rem 0 0;
  color: #2f5e3f;
  font-size: 0.78rem;
}

.intro-note {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.intro-note code {
  color: #0d4ca2;
}

.hero-abstract-text a {
  color: #2a5f9f;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.hero-abstract-text a:hover,
.hero-abstract-text a:focus-visible {
  color: #1f4a7f;
}

.content-section {
  margin: 1.6rem 0 0;
}

.section-heading {
  margin: 0;
  font-size: 1.35rem;
}

.section-description {
  margin: 0.45rem 0 0.9rem;
  color: var(--muted);
}

.section-line {
  margin: 0;
}

.section-gap {
  height: 0.35rem;
}

.section-list {
  margin: 0.35rem 0;
  padding-left: 1.9rem;
}

.section-list li {
  margin: 0.25rem 0;
}

.section-link {
  color: #1a69d9;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.section-link:hover,
.section-link:focus-visible {
  color: #12458f;
}

.example-list {
  display: grid;
  gap: 1rem;
}

.example-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 3px 12px rgba(23, 42, 67, 0.05);
  padding: 1rem;
}

.example-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.example-title {
  margin: 0;
  font-size: 1rem;
}

.looped-tag {
  color: #6f7f92;
  font-weight: 500;
}

.example-meta {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.example-meta-link {
  color: #0f4ea8;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.example-meta-link:hover,
.example-meta-link:focus-visible {
  color: #0b3c80;
}

.chip-row {
  display: flex;
  gap: 0.36rem;
  flex-wrap: wrap;
}

.chip {
  border: 1px solid #c8d5e5;
  background: #f6f9ff;
  color: #26445f;
  font-size: 0.73rem;
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
}

.track-grid {
  margin-top: 0.78rem;
  display: grid;
  gap: 0.7rem;
  grid-template-columns: repeat(auto-fit, minmax(255px, 1fr));
}

.track-grid.with-plot {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.track-tile {
  border: 1px solid #d6dfeb;
  border-radius: 11px;
  padding: 0.68rem;
  background: #fcfdff;
}

.track-label {
  margin: 0 0 0.4rem;
  font-size: 0.88rem;
  color: #2a3f5a;
}

audio {
  width: 100%;
}

.plot-image {
  display: block;
  width: 100%;
  height: 132px;
  object-fit: contain;
  border: 1px solid #d6dfeb;
  border-radius: 8px;
  background: #ffffff;
}

.description-panel {
  margin-top: 0.65rem;
  border-top: 1px dashed #cfd9e6;
  padding-top: 0.55rem;
}

.description-panel summary {
  cursor: pointer;
  color: #1f4e90;
  font-size: 0.88rem;
  font-weight: 600;
}

.description-text {
  margin: 0.55rem 0 0;
  font-size: 0.88rem;
  color: #314a65;
  white-space: pre-wrap;
}

.error-box {
  border: 1px solid #ecc4c4;
  background: #fff4f4;
  color: #8b1f1f;
  border-radius: 12px;
  padding: 0.8rem 0.95rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  padding: 1.05rem 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.noscript-box {
  margin-top: 1rem;
  margin-bottom: 1rem;
  border: 1px solid #e4c4a6;
  background: #fff8f0;
  color: #7d4a1b;
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
}

@media (max-width: 680px) {
  .hero {
    padding-top: 1.2rem;
  }

  .hero-card {
    padding: 1.2rem 1rem;
  }

  .header-row {
    align-items: flex-start;
    padding-top: 0.7rem;
  }

  .hero-affiliation-line {
    flex-wrap: wrap;
    row-gap: 0.32rem;
    white-space: normal;
  }

  .affiliation-item {
    white-space: normal;
  }

  .affiliation-separator {
    display: none;
  }
}

@media (max-width: 980px) {
  .track-grid.with-plot {
    grid-template-columns: 1fr;
  }
}