body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #0d1117;
  color: #c9d1d9;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.landing-container {
  max-width: 720px;
  margin: 4rem auto;
  padding: 2rem;
  text-align: center;
  background-color: #0d1117;
}

h1 {
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #f0f6fc;
}

h2, h3 {
  color: #d2dbe4;
  margin-top: 2rem;
  font-weight: 600;
}

p {
  font-size: 1.125rem;
  color: #8b949e;
  margin-bottom: 1.5rem;
}

.start-button {
  display: inline-block;
  margin-top: 2rem;
  padding: 0.85rem 2rem;
  background-color: #238636;
  color: #ffffff;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  font-size: 1rem;
  transition: background-color 0.25s ease;
}

.start-button:hover {
  background-color: #2ea043;
}

ul {
  text-align: left;
  margin: 2rem auto;
  padding: 0 1rem;
  max-width: 500px;
  list-style: none;
}

ul li {
  margin: 0.75rem 0;
  padding-left: 1.6rem;
  position: relative;
  color: #c9d1d9;
}

ul li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: #58a6ff;
}

details.how-it-works {
  margin-top: 2rem;
  padding: 1.2rem 1.4rem;
  border: 1px solid #30363d;
  border-radius: 8px;
  background-color: #161b22;
  color: #c9d1d9;
  text-align: left;
}

details[open] summary {
  font-weight: bold;
  margin-bottom: 0.75rem;
  color: #58a6ff;
  cursor: pointer;
}

.contact-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #30363d;
  text-align: center;
  font-size: 0.95rem;
  color: #8b949e;
}

.contact-footer ul {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0;
}

.contact-footer li {
  margin: 0.4rem 0;
}

.contact-footer a {
  color: #58a6ff;
  text-decoration: none;
}

.contact-footer a:hover {
  text-decoration: underline;
}

.code-block {
  background-color: #1e1e1e;
  color: #d4d4d4;
  border-radius: 8px;
  font-family: 'Fira Mono', Menlo, monospace;
  font-size: 0.95rem;
  line-height: 1.5;
  text-align: left;
  margin-bottom: 2rem;
  box-shadow: 0 0 0 1px #30363d;
  position: relative;
  padding: 1rem 1rem;
  padding-right: 3rem; /* preserve space visually */
}

.code-scroll {
  overflow-x: auto;
  white-space: nowrap;
  padding-bottom: 4px;
}

.copy-icon {
  position: absolute;
  top: 10px;
  right: 12px;
  background-color: #1e1e1e;
  border: none;
  font-size: 0.95rem;
  color: #ccc;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  opacity: 0.6;
  transition: opacity 0.2s ease;
  z-index: 10;
}

.copy-icon:hover {
  opacity: 1;
}

.code-block:hover::after {
  opacity: 1;
}

.code-block pre,
.code-block code {
  text-align: left;
  margin: 0;
  padding: 0;
  background: none;
  border: none;
  color: inherit;
}

.code-scroll::-webkit-scrollbar {
  height: 8px;
}

.code-scroll::-webkit-scrollbar-track {
  background: #1e1e1e;
}

.code-scroll::-webkit-scrollbar-thumb {
  background-color: #444c56;
  border-radius: 4px;
  border: 1px solid #30363d;
}

/* Firefox */
.code-scroll {
  scrollbar-color: #444c56 #1e1e1e;
  scrollbar-width: thin;
}