/* AIVEST Skills — Notion/Stripe-style: white base + single blue accent */
:root {
  --c-bg: #ffffff;
  --c-fg: #1a1a1a;
  --c-muted: #6b7280;
  --c-border: #e5e7eb;
  --c-card: #fafafa;
  --c-accent: #2563eb;
  --c-accent-hover: #1d4ed8;
  --c-code-bg: #0f172a;
  --c-code-fg: #e2e8f0;
  --radius: 8px;
  --max-w: 880px;
}

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

html, body {
  background: var(--c-bg);
  color: var(--c-fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 64px 24px;
}

header {
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 48px;
  padding-bottom: 24px;
}

header .logo {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  display: inline-block;
  margin-bottom: 8px;
}

h1 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 40px 0 16px;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
}

p { margin-bottom: 16px; color: var(--c-fg); }

.lead {
  font-size: 18px;
  color: var(--c-muted);
  margin-bottom: 32px;
}

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

ul, ol { padding-left: 24px; margin-bottom: 16px; }
li { margin-bottom: 6px; }

pre {
  background: var(--c-code-bg);
  color: var(--c-code-fg);
  padding: 16px 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 13px;
  line-height: 1.6;
  margin: 16px 0;
}

code {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 13px;
  background: #f3f4f6;
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--c-fg);
}

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

.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.skill-card {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--c-bg);
  transition: border-color 0.15s, box-shadow 0.15s;
  display: block;
  color: inherit;
  text-decoration: none;
}

.skill-card:hover {
  border-color: var(--c-accent);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
  text-decoration: none;
}

.skill-card .name {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.skill-card .desc {
  font-size: 14px;
  color: var(--c-muted);
  margin-bottom: 12px;
}

.skill-card .meta {
  font-size: 12px;
  color: var(--c-muted);
  display: flex;
  gap: 12px;
}

.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: #eff6ff;
  color: var(--c-accent);
  letter-spacing: 0.02em;
}

.badge.coming { background: #f3f4f6; color: var(--c-muted); }

.install-cmd {
  background: var(--c-code-bg);
  color: var(--c-code-fg);
  padding: 20px 24px;
  border-radius: var(--radius);
  font-family: "SF Mono", Menlo, monospace;
  font-size: 13px;
  position: relative;
  overflow-x: auto;
}

.section-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.section-meta .badge {
  background: var(--c-card);
  color: var(--c-fg);
  border: 1px solid var(--c-border);
}

footer {
  margin-top: 80px;
  padding-top: 32px;
  border-top: 1px solid var(--c-border);
  text-align: center;
  color: var(--c-muted);
  font-size: 13px;
}

footer a { color: var(--c-muted); }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

th, td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--c-border);
  text-align: left;
}

th {
  font-weight: 600;
  background: var(--c-card);
}

blockquote {
  border-left: 3px solid var(--c-accent);
  padding-left: 16px;
  margin: 16px 0;
  color: var(--c-muted);
}

.btn-back {
  display: inline-block;
  font-size: 13px;
  color: var(--c-muted);
  margin-bottom: 16px;
}