:root {
  --bg: #0d1117;
  --bg-2: #161b22;
  --border: #30363d;
  --text: #c9d1d9;
  --text-dim: #8b949e;
  --accent: #58a6ff;
  --green: #3fb950;
  --yellow: #d29922;
  --red: #f85149;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
}

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

a:hover {
  text-decoration: underline;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9em;
  background: var(--bg-2);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

pre {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
}

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

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 900px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text);
}

.logo img {
  width: 28px;
  height: 28px;
}

nav a {
  font-size: 0.9rem;
  color: var(--text-dim);
}

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

/* Main */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

section {
  margin-top: 3.5rem;
}

h1 {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

p {
  color: var(--text-dim);
  margin-bottom: 1rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 3rem 0 1rem;
}

.hero-logo {
  width: 96px;
  height: 96px;
  margin-bottom: 1rem;
}

.tagline {
  font-size: 1.15rem;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.sub {
  max-width: 520px;
  margin: 0 auto 1.5rem;
  font-size: 0.95rem;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border-radius: 6px;
  font-size: 0.9rem;
}

.btn:hover {
  text-decoration: none;
  opacity: 0.9;
}

/* Preview cards */
.preview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
}

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

.model {
  font-family: "SFMono-Regular", monospace;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.meta {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.badge.safe {
  background: rgba(63, 185, 80, 0.12);
  color: var(--green);
}

.badge.warn {
  background: rgba(210, 153, 34, 0.12);
  color: var(--yellow);
}

.badge.bad {
  background: rgba(248, 81, 73, 0.12);
  color: var(--red);
}

.text {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  font-style: italic;
  padding-top: 0.6rem;
  border-top: 1px solid var(--border);
}

/* Steps */
.steps {
  padding-left: 1.2rem;
  color: var(--text-dim);
}

.steps li {
  margin-bottom: 0.6rem;
}

.steps strong {
  color: var(--text);
}

/* Video */
.video-wrap {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-2);
}

.video-wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Footer */
footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Mobile */
@media (max-width: 600px) {
  h1 {
    font-size: 1.8rem;
  }

  .hero-logo {
    width: 72px;
    height: 72px;
  }
}