:root {
  --bg: #f7f7f2;
  --fg: #1d1d1b;
  --muted: #5b5a55;
  --line: #ddd8c8;
  --accent: #0e7490;
  --code-bg: #eeeadc;
  --pre-bg: #1d1d1b;
  --pre-fg: #e8e6df;
  --th-bg: #f2efe3;
  --install-cmd-bg: #1d1d1b;
  --install-cmd-fg: #e8e6df;
  --pillar-bg: #fffdf7;
  --before-bg: #faf0f0;
  --before-border: #dfc8c8;
  --before-heading: #7a3535;
  --after-bg: #f0f6f0;
  --after-border: #c0d8c0;
  --after-heading: #2a5a2a;
  --header-bg: rgba(247, 247, 242, 0.92);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1a1a18;
    --fg: #e8e6df;
    --muted: #9b9890;
    --line: #2e2e2a;
    --accent: #22d3ee;
    --code-bg: #2a2a26;
    --pre-bg: #111110;
    --pre-fg: #e8e6df;
    --th-bg: #252520;
    --install-cmd-bg: #0d0d0c;
    --install-cmd-fg: #e8e6df;
    --pillar-bg: #1e1e1a;
    --before-bg: #2a1818;
    --before-border: #4a2a2a;
    --before-heading: #e07070;
    --after-bg: #182a18;
    --after-border: #2a4a2a;
    --after-heading: #70c070;
    --header-bg: rgba(26, 26, 24, 0.92);
  }
}

:root[data-theme="dark"] {
  --bg: #1a1a18;
  --fg: #e8e6df;
  --muted: #9b9890;
  --line: #2e2e2a;
  --accent: #22d3ee;
  --code-bg: #2a2a26;
  --pre-bg: #111110;
  --pre-fg: #e8e6df;
  --th-bg: #252520;
  --install-cmd-bg: #0d0d0c;
  --install-cmd-fg: #e8e6df;
  --pillar-bg: #1e1e1a;
  --before-bg: #2a1818;
  --before-border: #4a2a2a;
  --before-heading: #e07070;
  --after-bg: #182a18;
  --after-border: #2a4a2a;
  --after-heading: #70c070;
  --header-bg: rgba(26, 26, 24, 0.92);
}

/* ---- Base ---- */
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
}
.shell {
  width: min(920px, calc(100% - 2rem));
  margin: 0 auto;
}

/* ---- Header ---- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 0;
}
.brand {
  color: var(--fg);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s;
}
.nav a:hover { color: var(--fg); }
.theme-toggle {
  background: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1;
  padding: 0.2rem 0.45rem;
  transition: color 0.15s, border-color 0.15s;
}
.theme-toggle:hover { color: var(--fg); border-color: var(--muted); }

/* ---- Content ---- */
.content {
  padding: 2rem 0 4rem;
  line-height: 1.7;
}
.content h1 { margin-top: 0; }
.content h2 {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}
.content h2:first-of-type {
  border-top: none;
  padding-top: 0;
}

a { color: var(--accent); }

pre, code {
  font-family: 'SFMono-Regular', Menlo, Consolas, monospace;
  font-size: 0.88rem;
}
code {
  background: var(--code-bg);
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
}
pre {
  padding: 1.2rem;
  overflow: auto;
  background: var(--pre-bg);
  color: var(--pre-fg);
  border-radius: 6px;
  border: none;
  line-height: 1.5;
}
pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  color: inherit;
}
blockquote {
  margin-left: 0;
  padding-left: 1rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}
table {
  border-collapse: collapse;
  width: 100%;
}
td, th {
  border: 1px solid var(--line);
  padding: 0.5rem 0.75rem;
  text-align: left;
}
th { background: var(--th-bg); }
img { max-width: 100%; }

/* ---- Hero (landing page) ---- */
.hero {
  text-align: center;
  padding: 4rem 0 3rem;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero-tagline {
  font-size: 2.4rem;
  line-height: 1.15;
  margin: 0 0 1.5rem;
  letter-spacing: -0.025em;
  font-weight: 800;
}
.hero-subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto 2rem;
  line-height: 1.65;
}
.install-cmd {
  background: var(--install-cmd-bg);
  color: var(--install-cmd-fg);
  padding: 0.65rem 1.5rem;
  border-radius: 6px;
  border: none;
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}
.install-cmd code {
  color: inherit;
  background: none;
  padding: 0;
}
.hero-cta {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.65rem 2rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: opacity 0.15s;
}
.hero-cta:hover {
  opacity: 0.85;
  color: #fff;
}

/* ---- Pillars (four feature cards) ---- */
.pillars {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin: 2rem 0 3rem;
}
@media (max-width: 640px) {
  .pillars { grid-template-columns: 1fr; }
}
.pillar {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.5rem;
  background: var(--pillar-bg);
}
.pillar h3 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
}
.pillar-term {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.8rem;
  margin-left: 0.25rem;
}
.pillar-term::before { content: '/ '; }
.pillar-what {
  margin: 0 0 0.4rem;
  font-size: 0.92rem;
  line-height: 1.5;
}
.pillar-why {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ---- Before / After comparison ---- */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 2rem 0 3rem;
}
@media (max-width: 640px) {
  .comparison { grid-template-columns: 1fr; }
}
.comparison-col {
  border-radius: 8px;
  padding: 1.25rem;
}
.comparison-col h3 {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 700;
}
.comparison-col ul {
  margin: 0;
  padding-left: 1.2rem;
}
.comparison-col li {
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  line-height: 1.5;
}
.comparison-col--before {
  background: var(--before-bg);
  border: 1px solid var(--before-border);
}
.comparison-col--before h3 { color: var(--before-heading); }
.comparison-col--after {
  background: var(--after-bg);
  border: 1px solid var(--after-border);
}
.comparison-col--after h3 { color: var(--after-heading); }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0;
  color: var(--muted);
  font-size: 0.85rem;
}
.site-footer .shell {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-links {
  display: flex;
  gap: 1.2rem;
}
.footer-links a {
  color: var(--muted);
  text-decoration: none;
}
.footer-links a:hover { color: var(--accent); }