:root {
  --bg: #0d1117;
  --panel: #161b22;
  --text: #e6edf3;
  --muted: #8b949e;
  --border: #30363d;
  --link: #58a6ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

.readme {
  max-width: 940px;
  margin: 0 auto;
  padding: 40px 24px 64px;
}

.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

h1,
h2,
h3 {
  color: var(--text);
  font-weight: 600;
}

h1 {
  margin: 0 0 8px;
  font-size: 2.2em;
  letter-spacing: 0.02em;
}

h2 {
  margin-top: 34px;
  margin-bottom: 16px;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
  font-size: 1.45em;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.05em;
}

.logo-wrap {
  flex: 0 0 auto;
}

.project-logo {
  width: 94px;
  height: auto;
  display: block;
  border-radius: 8px;
}

.subtitle {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 18px;
}

.techline {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

p {
  margin-top: 0;
  margin-bottom: 16px;
}

ul,
ol {
  padding-left: 1.6em;
  margin-top: 0;
  margin-bottom: 16px;
}

.toc {
  columns: 2;
}

li {
  margin-bottom: 4px;
}

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

a:hover {
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

pre {
  margin: 16px 0 20px;
  padding: 18px;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

code {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 14px;
  color: var(--text);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 16px 0;
}

.card {
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.card p {
  margin: 0;
  color: var(--muted);
}

details {
  margin: 16px 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}

summary {
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 600;
  background: var(--panel);
  border-radius: 8px;
}

details[open] summary {
  border-bottom: 1px solid var(--border);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

details p {
  padding: 16px 16px 0;
}

img {
  max-width: 100%;
  height: auto;
}

details img {
  display: block;
  margin: 16px;
  max-width: calc(100% - 32px);
  border: 1px solid var(--border);
  border-radius: 8px;
}

hr {
  height: 1px;
  padding: 0;
  margin: 32px 0;
  background-color: var(--border);
  border: 0;
}

.footer-text {
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 760px) {
  .hero {
    align-items: flex-start;
  }

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

  .toc {
    columns: 1;
  }
}

@media (max-width: 640px) {
  .readme {
    padding: 28px 16px 48px;
  }

  .hero {
    flex-direction: column-reverse;
  }

  h1 {
    font-size: 1.9em;
  }

  .project-logo {
    width: 82px;
  }
}