:root {
  color-scheme: dark;
  --bg: #000000;
  --text: #ffffff;
  --muted: #d0d0d0;
  --border: #555555;
  --accent: #7db8ff;
  --accent-hover: #b7d8ff;
  --radius: 12px;
  --content: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: #000000;
  color: #ffffff;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.65;
}

a {
  color: var(--accent);
}

a:hover {
  color: var(--accent-hover);
}

header.site-header {
  background-color: #000000;
  color: #ffffff;
  border-bottom: 1px solid var(--border);
}

.header-inner,
main,
.footer-inner {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
}

.site-title {
  margin: 0;
  color: #ffffff;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

nav a {
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
}

nav a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.hero {
  padding: 58px 0 34px;
}

.hero h1 {
  margin: 0 0 12px;
  color: #ffffff;
  font-size: clamp(2.2rem, 6vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.hero p,
.lead {
  max-width: 900px;
  color: var(--muted);
}

.hero p {
  margin: 0;
  font-size: 1.14rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-block;
  padding: 10px 15px;
  border: 1px solid #ffffff;
  border-radius: 8px;
  background-color: #ffffff;
  color: #000000;
  text-decoration: none;
  font-weight: 700;
}

.button.secondary {
  background-color: #000000;
  color: #ffffff;
}

.button:hover {
  background-color: #d9d9d9;
  color: #000000;
}

.button.secondary:hover {
  background-color: #1a1a1a;
  color: #ffffff;
}

section {
  margin: 0 0 48px;
}

section > h2 {
  margin-bottom: 10px;
  color: #ffffff;
  font-size: 1.7rem;
  letter-spacing: -0.02em;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: #ffffff;
}

.panel,
.card {
  background-color: #000000;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.panel {
  padding: 22px;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(245px, 1fr));
  gap: 20px;
  margin-top: 22px;
}

.card {
  overflow: hidden;
}

.card a.image-link {
  display: block;
  background-color: #000000;
}

.card img {
  display: block;
  width: 100%;
  aspect-ratio: 250 / 188;
  object-fit: cover;
}

.card-body {
  padding: 16px 17px 18px;
}

.card h3 {
  margin: 0 0 7px;
  font-size: 1.08rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card .links {
  margin-top: 12px;
  font-size: 0.92rem;
}

code,
pre {
  font-family: "Courier New", Courier, monospace;
}

code {
  padding: 0.1em 0.3em;
  background-color: #151515;
  color: #ffffff;
  border-radius: 4px;
}

pre {
  overflow-x: auto;
  padding: 16px;
  background-color: #101010;
  color: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
}

pre code {
  padding: 0;
  background: none;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: #000000;
  color: #ffffff;
}

th,
td {
  padding: 11px 13px;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  background-color: #151515;
}

.math-page main {
  max-width: 920px;
}

.math-page main > h1 {
  margin-top: 48px;
}

.math-page h2 {
  margin-top: 2.2em;
}

.math-page h3 {
  margin-top: 1.8em;
}

.math-page blockquote {
  margin-left: 0;
  padding: 1px 18px;
  background-color: #000000;
  border-left: 4px solid #ffffff;
  color: #ffffff;
}

footer {
  margin-top: 64px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 700px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding-top: 38px;
  }
}