:root {
  --bg: #0b0d10;
  --surface: #12151a;
  --surface-2: #171b22;
  --border: #232833;
  --text: #e6e8ec;
  --text-dim: #a0a6b3;
  --text-mute: #6b7280;
  --accent: #7c9cff;
  --accent-2: #b184ff;
  --code-bg: #0a0c10;
  --max: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

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

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

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(11, 13, 16, 0.85);
  backdrop-filter: saturate(160%) blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 14px;
  padding-bottom: 14px;
}
.site-header .brand {
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: 17px;
}
.site-header .brand:hover { text-decoration: none; opacity: 0.9; }
.site-header nav { display: flex; gap: 20px; font-size: 14px; }
.site-header nav a { color: var(--text-dim); }
.site-header nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
  padding: 72px 0 40px;
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0 0 16px;
  font-weight: 800;
}
.hero p.lead {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 760px;
  margin: 0 0 24px;
}
.hero .meta {
  font-size: 13px;
  color: var(--text-mute);
}
.hero .meta a { color: var(--text-dim); }

/* Category filter chips (optional visual) */
.categories {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 24px 0 8px;
}
.chip {
  font-size: 12px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-dim);
  background: var(--surface);
}

/* Explainer */
.explainer {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--border);
}
.explainer-inner {
  max-width: 760px;
}
.explainer h2 {
  font-size: 28px;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  font-weight: 700;
}
.explainer p {
  font-size: 17px;
  color: var(--text-dim);
  margin: 0 0 16px;
}
.explainer p strong {
  color: var(--text);
  font-weight: 600;
}
.explainer p code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--surface-2);
  color: var(--text);
}
.explainer p em {
  color: var(--text);
  font-style: italic;
}

.section-title {
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 40px 0 8px;
  font-weight: 700;
}

/* Tool grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 24px 0 80px;
}
.card {
  display: block;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color .15s ease, transform .15s ease, background .15s ease;
  color: var(--text);
}
.card:hover {
  border-color: #3a4560;
  background: var(--surface-2);
  text-decoration: none;
  transform: translateY(-1px);
}
.card h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.card .tagline {
  font-size: 14px;
  color: var(--text-dim);
  margin: 0 0 12px;
}
.card .cat {
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

/* Tool page */
.tool-page {
  padding: 48px 0 80px;
}
.tool-page .cat-label {
  display: inline-block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 12px;
}
.tool-page h1 {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
  font-weight: 800;
}
.tool-page .subtitle {
  font-size: 18px;
  color: var(--text-dim);
  margin: 0 0 16px;
}
.tool-page .official-link {
  font-size: 14px;
  color: var(--text-mute);
  margin: 0 0 32px;
}
.tool-page .intro {
  font-size: 17px;
  color: var(--text);
  max-width: 760px;
  margin: 0 0 40px;
}

/* Prompt sections */
.prompt-block {
  margin: 32px 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--code-bg);
}
.prompt-block h2 {
  margin: 0;
  padding: 14px 18px;
  font-size: 14px;
  font-weight: 600;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  color: var(--text);
  letter-spacing: -0.005em;
}
.prompt-block pre {
  margin: 0;
  padding: 20px;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.55;
  color: #d0d4dc;
  white-space: pre-wrap;
  word-wrap: break-word;
  max-height: 640px;
  overflow-y: auto;
}

/* TOC */
.toc {
  margin: 24px 0 40px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.toc strong { display: block; font-size: 13px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 8px; }
.toc ul { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 8px 16px; }
.toc a { font-size: 14px; }

/* Related */
.related {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.related h2 { font-size: 20px; margin: 0 0 16px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  color: var(--text-mute);
  font-size: 13px;
}
.site-footer a { color: var(--text-dim); }

/* Utility */
.small { font-size: 13px; color: var(--text-mute); }

@media (max-width: 640px) {
  .hero { padding: 48px 0 32px; }
  .container { padding: 0 18px; }
}