:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-text: #1a1d23;
  --color-muted: #5b6472;
  --color-primary: #2c5fff;
  --color-primary-hover: #1e4ae0;
  --color-border: #e3e6ec;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(20, 30, 50, 0.06);
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

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

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

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
}
.brand:hover { text-decoration: none; }

.site-nav .nav-list {
  list-style: none;
  display: flex;
  gap: 24px;
  margin: 0;
  padding: 0;
}
.site-nav a {
  color: var(--color-muted);
  font-weight: 500;
}
.site-nav a.active,
.site-nav a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--color-text);
}

/* Main */
.site-main {
  padding: 48px 24px;
  min-height: calc(100vh - 64px - 120px);
}

/* Hero */
.hero {
  text-align: center;
  padding: 32px 0 48px;
}
.hero h1 {
  font-size: 2.25rem;
  margin: 0 0 12px;
}
.lead {
  font-size: 1.1rem;
  color: var(--color-muted);
  max-width: 640px;
  margin: 0 auto 24px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 22px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
  border: none;
  font-weight: 600;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.15s ease;
}
.btn:hover {
  background: var(--color-primary-hover);
  text-decoration: none;
  color: #fff;
}
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn-secondary:hover {
  background: var(--color-primary);
  color: #fff;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 32px;
}
.card {
  background: var(--color-surface);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--color-border);
}
.card h2 {
  margin-top: 0;
  font-size: 1.15rem;
}
.card p { color: var(--color-muted); }

.jq-output {
  margin-top: 12px;
  font-weight: 600;
  color: var(--color-primary);
  min-height: 1.5em;
}

/* Page intro */
.page-intro { padding: 16px 0 24px; }
.page-intro h1 { margin: 0 0 8px; font-size: 2rem; }

.text-block {
  background: var(--color-surface);
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}
.text-block h2 { margin-top: 24px; }
.text-block h2:first-child { margin-top: 0; }

code {
  background: #eef0f5;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* Footer */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
  margin-top: 48px;
}
.footer-inner { text-align: center; color: var(--color-muted); font-size: 0.9rem; }
.footer-inner p { margin: 4px 0; }
.build-info { font-size: 0.8rem; opacity: 0.7; }

/* Mobile */
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-list {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    display: none;
  }
  .nav-list.open { display: flex; }
  .nav-list li { border-top: 1px solid var(--color-border); }
  .nav-list a { display: block; padding: 14px 24px; }
  .hero h1 { font-size: 1.7rem; }
}