/* ==========================================================================
   llmrb.github.io — llm.rb family of projects
   ========================================================================== */

:root {
  --color-bg: #0d0d0d;
  --color-surface: #1a1a1a;
  --color-text: #e5e5e5;
  --color-text-secondary: #9ca3af;
  --color-text-muted: #555555;
  --color-accent: #22c55e;
  --color-accent-dim: rgba(34, 197, 94, 0.12);
  --color-accent-hover: #4ade80;
  --color-border: #2a2a2a;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "JetBrains Mono",
               "Cascadia Code", "Menlo", "Consolas", monospace;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
             "Helvetica Neue", Arial, sans-serif;
  --content-width: 860px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-ui);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Nav
   ========================================================================== */

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--color-border);
}

nav .brand {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

nav .brand .mark {
  width: 18px;
  height: 18px;
  border-radius: 3px;
  background: var(--color-accent);
}

nav .links {
  display: flex;
  gap: 20px;
}

nav .links a {
  font-size: 13px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-family: var(--font-mono);
  transition: color 0.15s ease;
}

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

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  text-align: center;
  padding: 80px 24px 48px;
}

.hero .logo {
  width: 100px;
  height: 100px;
  border-radius: 14px;
  object-fit: cover;
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 10px;
}

.hero .tagline {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ==========================================================================
   Project cards
   ========================================================================== */

.projects {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  padding: 48px 0;
}

@media (max-width: 640px) {
  .projects { grid-template-columns: 1fr; }
}

.card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 28px;
  transition: border-color 0.15s ease;
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

.card:hover { border-color: var(--color-accent); }

.card .card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.card .card-icon {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
}

.card .card-icon.fallback {
  background: var(--color-accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 700;
}

.card h2 {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
  flex: 1;
}

.card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
  position: relative;
  z-index: 2;
}

.card .tag {
  display: inline-block;
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--color-accent);
  background: var(--color-accent-dim);
  padding: 2px 8px;
}

.card .links {
  display: flex;
  gap: 14px;
  position: relative;
  z-index: 2;
}

.card .links a {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* Card overlay link */
.card-link {
  position: absolute;
  inset: 0;
  z-index: 1;
}

/* ==========================================================================
   Section
   ========================================================================== */

.section {
  padding: 36px 0;
}

.section h2 {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.section p {
  color: var(--color-text-secondary);
  margin-bottom: 14px;
  line-height: 1.75;
}

.section a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

/* Inline code */
.section code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #f472b6;
  background: #0a0a0a;
  padding: 1px 5px;
  border: 1px solid var(--color-border);
  border-radius: 3px;
}

/* Block code */
.section pre {
  background: #0a0a0a;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 16px;
  margin-bottom: 14px;
  overflow-x: auto;
  line-height: 1.5;
}

.section pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: 13px;
  text-decoration: none;
}

/* Lists */
.section ul {
  list-style: none;
  margin-bottom: 14px;
}

.section li {
  color: var(--color-text-secondary);
  margin-bottom: 6px;
  padding-left: 18px;
  position: relative;
  line-height: 1.65;
}

.section li::before {
  content: "-";
  color: var(--color-accent);
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
}

.section li strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ==========================================================================
   GitHub corner
   ========================================================================== */

.github-corner:hover .octo-arm {
  animation: octocat-wave 560ms ease-in-out;
}

@keyframes octocat-wave {
  0%, 100% { transform: rotate(0); }
  20%, 60% { transform: rotate(-25deg); }
  40%, 80% { transform: rotate(10deg); }
}

@media (max-width: 500px) {
  .github-corner:hover .octo-arm { animation: none; }
  .github-corner .octo-arm { animation: octocat-wave 560ms ease-in-out; }
}

/* ==========================================================================
   Footer
   ========================================================================== */

footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 24px;
  text-align: center;
}

footer a {
  color: var(--color-text-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-size: 13px;
}

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

footer p {
  color: var(--color-text-muted);
  font-size: 12px;
  margin-top: 8px;
}