/* Base Setup (Default / Dark Mode) */
:root {
  --bg-color: #0f1115;
  --card-bg: #181b21;
  --card-border: #2a2e39;
  --text-main: #e6e8ec;
  --text-muted: #9a9ea8;
  --accent: #3a86ff;
  --accent-light: rgba(58, 134, 255, 0.15);
  --code-bg: #090a0d;
  --code-border: #232731;
  --badge-bg: #222733;
}

/* Light Mode Override (System Preference) */
@media (prefers-color-scheme: light) {
  :root {
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --card-border: #e1e4eb;
    --text-main: #1f2328;
    --text-muted: #656d76;
    --accent: #0969da;
    --accent-light: rgba(9, 105, 218, 0.08);
    --code-bg: #f6f8fa;
    --code-border: #d0d7de;
    --badge-bg: #eef2f8;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  padding: 2rem 1rem;
  transition: background-color 0.2s, color 0.2s;
}

.container {
  max-width: 680px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  font-size: 2rem;
  font-weight: bold;
  background-color: var(--badge-bg);
  color: var(--accent);
  border-radius: 16px;
  margin-bottom: 1rem;
  border: 1px solid var(--card-border);
}

h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

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

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.card h2 {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

pre {
  background-color: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9rem;
  color: var(--accent);
}

.arch-list {
  list-style: none;
}

.arch-list a {
  display: flex;
  flex-direction: column;
  padding: 0.85rem 1rem;
  background-color: var(--accent-light);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-main);
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.arch-list a:hover {
  transform: translateY(-1px);
}

.arch-list strong {
  color: var(--accent);
  font-size: 1rem;
}

.arch-list span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

footer {
  text-align: center;
  margin-top: 3rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}