/**
 * 09-landing.css
 * Landing-page specific layout and component styles.
 * Loads after 08-layout so hero overrides correctly take precedence.
 * Part of: Agentic Semantic Web
 */

/* ── [data-section] — horizontal-rule sections ──────────────────────────
   Usage: <section data-section> or <section data-section="demo">
─────────────────────────────────────────────────────────────────────── */

[data-section] {
  padding-block: var(--space-8);
  border-bottom: var(--border-width) solid var(--border-subtle);
}

/* ── [data-section-header] — centered section heading ───────────────────
   Usage: <header data-section-header> inside [data-section]
─────────────────────────────────────────────────────────────────────── */

[data-section-header] {
  text-align: center;
  margin-bottom: var(--space-6);
}

[data-section-header] h2 {
  margin-bottom: var(--space-3);
}

[data-section-header] > p {
  color: var(--text-2);
  max-width: 50ch;
  margin-inline: auto;
  margin-bottom: 0;
}

/* ── Hero overrides — extend [data-layout="hero"] ───────────────────────
   Base centering and border live in 08-layout.css; this layer tunes sizing.
─────────────────────────────────────────────────────────────────────── */

[data-layout="hero"] {
  padding: clamp(3.5rem, 10vw, 7rem) var(--space-5) clamp(3rem, 8vw, 5.5rem);
}

[data-layout="hero"] h1 {
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  font-weight: var(--font-weight-2);
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin-bottom: var(--space-4);
}

[data-text~="tagline"] {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--text-2);
  max-width: 46ch;
  margin-inline: auto;
  margin-bottom: var(--space-5);
  line-height: var(--leading-tight);
}

/* ── figure[data-pane] — side-by-side demo panes ────────────────────────
   Usage:
     <figure data-pane="code">
       <figcaption>HTML</figcaption>
       <pre><code>…</code></pre>
     </figure>
     <figure data-pane="result">
       <figcaption>Result</figcaption>
       <div data-pane-body>…</div>
     </figure>
─────────────────────────────────────────────────────────────────────── */

figure[data-pane] {
  background: var(--surface-1);
  border: var(--border-width) solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  margin: 0;
}

figure[data-pane] > figcaption {
  background: var(--surface-2);
  border-bottom: var(--border-width) solid var(--border);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  flex-shrink: 0;
}

figure[data-pane="code"] > pre {
  margin: 0;
  padding: var(--space-4) var(--space-5);
  background: transparent;
  border: none;
  font-size: 0.775rem;
  line-height: 1.75;
  flex: 1;
  overflow-x: auto;
}

figure[data-pane="result"] > [data-pane-body] {
  padding: var(--space-5);
  flex: 1;
}

figure[data-pane="result"] > [data-pane-body] article {
  margin: 0;
}

/* ── article[data-pillar] — three-pillar feature cards ──────────────────
   ASW already styles article as a card; data-pillar tunes internals.
─────────────────────────────────────────────────────────────────────── */

article[data-pillar] {
  padding: var(--space-5);
}

article[data-pillar] h3 {
  margin-bottom: var(--space-2);
}

article[data-pillar] > p {
  color: var(--text-2);
  font-size: var(--text-sm);
  margin: 0;
}

/* ── [data-preview] — inert mini page preview ───────────────────────────
   Sits inside article[data-card="page-type"]. pointer-events: none keeps
   it visually alive but non-interactive.
─────────────────────────────────────────────────────────────────────── */

[data-preview] {
  margin-top: var(--space-4);
  padding: var(--space-4);
  background: var(--surface);
  border: var(--border-width) solid var(--border-subtle);
  border-radius: var(--radius-sm);
  pointer-events: none;
  overflow: hidden;
}

/* ── [data-agent-native] — agent vocabulary section ─────────────────────
─────────────────────────────────────────────────────────────────────── */

[data-agent-native] h4 {
  margin-top: 0;
  margin-bottom: var(--space-2);
}

[data-agent-native] pre {
  font-size: var(--text-xs);
  margin-top: var(--space-3);
}