:root {
  --basalt-ink: #26343a;
  --basalt-muted: #5c6c73;
  --basalt-teal: #176f73;
  --basalt-teal-dark: #0f555a;
  --basalt-green: #55ad62;
  --basalt-blue: #7bb9cb;
  --basalt-gold: #c9a75e;
  --basalt-surface: #ffffff;
  --basalt-surface-soft: #f4f8f7;
  --basalt-border: #dce7e4;
  --basalt-shadow: 0 14px 38px rgba(28, 67, 68, 0.09);
  --pst-font-family-base: "Times New Roman", Times, serif;
  --pst-font-family-heading: "Times New Roman", Times, serif;
  --pst-font-family-monospace: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --bs-body-font-family: "Times New Roman", Times, serif;
  --bs-body-font-size: 1.08rem;
  --bs-body-line-height: 1.7;
  --pst-color-primary: var(--basalt-teal);
  --pst-color-link: var(--basalt-teal);
  --pst-color-link-hover: var(--basalt-teal-dark);
}

html[data-theme="dark"] {
  --basalt-ink: #e9f0ef;
  --basalt-muted: #b5c2c0;
  --basalt-surface: #202a2e;
  --basalt-surface-soft: #27363a;
  --basalt-border: #3c4e50;
  --basalt-shadow: 0 14px 38px rgba(0, 0, 0, 0.22);
  --pst-color-primary: #79c5c1;
  --pst-color-link: #7dc9c4;
  --pst-color-link-hover: #9cddd8;
}

html {
  font-size: 100%;
}

body,
button,
input,
select,
textarea {
  font-family: "Times New Roman", Times, serif;
}

body {
  color: var(--basalt-ink);
  font-size: 1.08rem;
  line-height: 1.7;
}

code,
kbd,
pre,
samp,
.highlight {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

/* Sphinx Book shell */
.bd-header {
  border-bottom: 1px solid var(--basalt-border);
  box-shadow: none;
}

.bd-main .bd-content .bd-article-container {
  max-width: 59rem;
}

.bd-article {
  font-size: 1.1rem;
  line-height: 1.72;
}

.bd-sidebar-primary,
.bd-sidebar-secondary {
  font-size: 1rem;
  line-height: 1.45;
}

.bd-sidebar-primary {
  border-right: 1px solid var(--basalt-border);
}

.bd-sidebar-secondary {
  border-left: 1px solid var(--basalt-border);
}

.bd-sidebar-primary .sidebar-primary-items__start {
  margin-bottom: 0.8rem;
}

.navbar-brand.logo {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.navbar-brand.logo img {
  width: 9.4rem;
  max-height: 9.4rem;
  border: 1px solid var(--basalt-border);
  border-radius: 50%;
  box-shadow: 0 8px 25px rgba(35, 87, 88, 0.13);
  object-fit: cover;
}

.bd-links .nav-link,
.bd-toc .nav-link,
.toc-entry a {
  color: var(--basalt-muted);
  font-size: 0.98rem;
}

.bd-links .nav-link:hover,
.bd-toc .nav-link:hover,
.toc-entry a:hover,
.bd-links .active > .nav-link,
.bd-toc .active > .nav-link {
  color: var(--pst-color-primary);
}

.bd-links p.caption {
  color: var(--basalt-ink);
  font-size: 0.93rem;
  font-weight: 700;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.search-button-field,
.form-control {
  min-height: 2.5rem;
  font-size: 1rem;
}

/* Scientific typography */
.bd-article h1,
.bd-article h2,
.bd-article h3,
.bd-article h4 {
  color: var(--basalt-ink);
  font-family: "Times New Roman", Times, serif;
  font-weight: 700;
}

.bd-article h1 {
  margin-bottom: 0.75em;
  font-size: clamp(2.35rem, 4vw, 3.1rem);
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.bd-article h2 {
  margin-top: 2.15em;
  padding-bottom: 0.28em;
  border-bottom: 1px solid var(--basalt-border);
  font-size: 1.7rem;
  letter-spacing: -0.018em;
}

.bd-article h3 {
  margin-top: 1.65em;
  font-size: 1.3rem;
}

.bd-article p,
.bd-article li,
.bd-article td,
.bd-article th {
  font-size: inherit;
}

.bd-article a {
  font-weight: 600;
  text-decoration-thickness: 0.055em;
  text-underline-offset: 0.15em;
}

.bd-article code.literal {
  font-size: 0.88em;
}

.highlight pre {
  font-size: 0.92rem;
  line-height: 1.55;
}

.bd-article table {
  width: 100%;
  border-color: var(--basalt-border);
  font-size: 1rem;
}

.bd-article table thead tr {
  background: var(--basalt-surface-soft);
}

.bd-article table th {
  color: var(--basalt-ink);
  font-weight: 700;
}

.bd-article .admonition {
  border-radius: 0.58rem;
  font-size: 1rem;
  box-shadow: 0 5px 18px rgba(29, 65, 66, 0.05);
}

.bd-article .admonition-title {
  font-size: 1.02rem;
}

.bd-article figcaption,
.bd-article .caption-text {
  color: var(--basalt-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

/* Landing page */
.basalt-hero {
  position: relative;
  margin: 0 0 1.6rem;
  padding: 2.45rem 2.55rem 2rem;
  overflow: hidden;
  background: linear-gradient(135deg, color-mix(in srgb, var(--basalt-blue) 19%, var(--basalt-surface)) 0%, var(--basalt-surface) 50%, color-mix(in srgb, var(--basalt-green) 10%, var(--basalt-surface)) 100%);
  border: 1px solid var(--basalt-border);
  border-radius: 1rem;
  box-shadow: var(--basalt-shadow);
}

.basalt-hero::before {
  position: absolute;
  top: -4.2rem;
  right: -3.2rem;
  width: 16rem;
  height: 16rem;
  background: url("../../_images/pku-embl-logo.png") center / contain no-repeat;
  content: "";
  opacity: 0.07;
  pointer-events: none;
}

.basalt-hero > * {
  position: relative;
  z-index: 1;
}

.basalt-hero__eyebrow {
  margin-bottom: 0;
  color: var(--basalt-teal);
  font-size: 0.94rem !important;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.basalt-hero__tagline {
  max-width: 47rem;
  color: var(--basalt-ink);
  font-size: 1.3rem !important;
  font-weight: 600;
  line-height: 1.42;
}

.basalt-hero__summary {
  max-width: 48rem;
  color: var(--basalt-muted);
  font-size: 1.06rem !important;
}

.basalt-hero__image {
  display: block;
  width: 100%;
  margin: 1.05rem 0;
  padding: 0.65rem;
  background: #ffffff;
  border: 1px solid var(--basalt-border);
  border-radius: 0.72rem;
  box-shadow: 0 8px 26px rgba(29, 65, 66, 0.08);
}

.basalt-hero__actions,
.basalt-hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.basalt-hero__actions {
  margin: 1.3rem 0 0.9rem;
}

.basalt-button {
  display: inline-flex;
  min-height: 2.55rem;
  padding: 0.53rem 1rem;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none !important;
  transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.basalt-button:hover {
  transform: translateY(-2px);
}

.basalt-button--primary {
  color: #ffffff !important;
  background: var(--basalt-teal);
  box-shadow: 0 8px 22px rgba(23, 111, 115, 0.22);
}

.basalt-button--primary:hover {
  background: var(--basalt-teal-dark);
}

.basalt-button--secondary {
  color: var(--basalt-teal) !important;
  background: var(--basalt-surface);
  border-color: color-mix(in srgb, var(--basalt-teal) 35%, var(--basalt-border));
}

.basalt-button--quiet {
  color: var(--basalt-ink) !important;
  border-color: var(--basalt-border);
}

.basalt-hero__badges {
  margin-bottom: 0;
}

.basalt-hero__badges span,
.basalt-hero__badges a {
  padding: 0.22rem 0.58rem;
  color: var(--basalt-muted);
  background: color-mix(in srgb, var(--basalt-surface) 82%, transparent);
  border: 1px solid var(--basalt-border);
  border-radius: 999px;
  font-size: 0.91rem;
  font-weight: 600;
  text-decoration: none;
}

.sd-card {
  overflow: hidden;
  border: 1px solid var(--basalt-border) !important;
  border-radius: 0.72rem;
  box-shadow: 0 6px 20px rgba(29, 65, 66, 0.05) !important;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.sd-card::before {
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--basalt-teal), var(--basalt-green), var(--basalt-gold));
  content: "";
}

.sd-card:hover {
  border-color: var(--basalt-teal) !important;
  box-shadow: 0 12px 28px rgba(29, 65, 66, 0.1) !important;
  transform: translateY(-3px);
}

.sd-card-title {
  color: var(--basalt-ink);
  font-family: "Times New Roman", Times, serif;
  font-size: 1.17rem;
  font-weight: 700;
}

.sd-card-text {
  color: var(--basalt-muted);
  font-size: 1rem;
}

.basalt-workflow {
  display: block;
  width: min(100%, 54rem);
  margin: 1rem auto 1.5rem;
  padding: 0.7rem;
  background: #ffffff;
  border: 1px solid var(--basalt-border);
  border-radius: 0.75rem;
}

.basalt-framework {
  display: block;
  width: auto;
  max-width: 100%;
  max-height: 34rem;
  margin: 1rem auto 1.7rem;
  padding: 0.8rem;
  background: #ffffff;
  border: 1px solid var(--basalt-border);
  border-radius: 0.8rem;
  box-shadow: 0 8px 26px rgba(29, 65, 66, 0.07);
  object-fit: contain;
}

figure:has(> .basalt-framework) figcaption {
  max-width: 43rem;
  margin: 0.75rem auto 0;
  text-align: left;
}

@media (max-width: 959px) {
  body,
  .bd-article {
    font-size: 1.05rem;
  }

  .basalt-hero {
    padding: 1.55rem 1.25rem 1.3rem;
  }

  .basalt-hero h1 {
    font-size: 2.45rem;
  }
}

@media (max-width: 575px) {
  .basalt-hero__actions {
    display: grid;
  }

  .basalt-button {
    width: 100%;
  }
}

@media print {
  .basalt-hero,
  .sd-card {
    box-shadow: none !important;
  }
}