/* SyntaxShelf landing site — palette derived from app icon:
   charcoal card stack with orange (#ff5a36), teal (#2bbfa4), purple (#a78bfa) tabs. */

:root {
  --bg: #0e0e11;
  --surface: #1b1b20;
  --surface-2: #232329;
  --border: #2e2e36;
  --text: #e8e8ec;
  --muted: #a7a7b1;
  --accent: #ff5a36;
  --accent-soft: rgba(255, 90, 54, 0.12);
  --teal: #2bbfa4;
  --purple: #a78bfa;
  --link: #ff7a5c;
  --code-bg: #17171b;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  --radius: 12px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #faf9f7;
    --surface: #ffffff;
    --surface-2: #f1f0ec;
    --border: #dedcd6;
    --text: #1c1c21;
    --muted: #565660;
    --accent: #d63d1a;
    --accent-soft: rgba(214, 61, 26, 0.09);
    --teal: #0f8a75;
    --purple: #6d4fd1;
    --link: #c2360f;
    --code-bg: #14141a;
    --shadow: 0 10px 30px rgba(30, 25, 20, 0.10);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 1.0625rem;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }

a { color: var(--link); text-underline-offset: 3px; }
a:hover { color: var(--accent); }

:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 100;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; color: #fff; }

.wrap { max-width: 1060px; margin: 0 auto; padding: 0 1.25rem; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}
.brand img { width: 34px; height: 34px; border-radius: 8px; }
.brand .tld { color: var(--accent); }

.nav-toggle {
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.45rem 0.7rem;
  font: inherit;
  cursor: pointer;
}
.site-nav ul {
  display: flex;
  gap: 1.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--text); }

@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }
  .site-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); padding: 0.75rem 1.25rem 1.25rem; }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; gap: 0.9rem; }
}

/* ---------- Hero ---------- */
.hero { padding: 4rem 0 3.5rem; }
.hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}
@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero { padding: 2.75rem 0 2.5rem; }
}

.kicker {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 0.9rem;
}
.hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 2.9rem);
  line-height: 1.15;
  margin: 0 0 1.1rem;
  letter-spacing: -0.02em;
}
.hero h1 .hl { color: var(--accent); }
.hero .lede { color: var(--muted); font-size: 1.15rem; margin: 0 0 1.75rem; max-width: 34em; }

.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; }

.play-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  background: #000;
  color: #fff;
  border: 1px solid #4a4a52;
  border-radius: 10px;
  padding: 0.55rem 1.15rem 0.55rem 0.9rem;
  text-decoration: none;
  line-height: 1.2;
}
.play-badge:hover { border-color: var(--accent); color: #fff; }
.play-badge svg { width: 26px; height: 28px; flex: none; }
.play-badge .txt small { display: block; font-size: 0.62rem; letter-spacing: 0.06em; text-transform: uppercase; opacity: 0.85; }
.play-badge .txt strong { font-size: 1.12rem; font-weight: 600; }

.hero-note { font-size: 0.9rem; color: var(--muted); margin-top: 1rem; }
.hero-note code { font-family: var(--mono); font-size: 0.85em; }

/* Shelf mock (decorative, built from verified topic names only) */
.shelf { position: relative; display: grid; gap: 0.8rem; }
.shelf-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.2rem;
  font-family: var(--mono);
  font-size: 0.9rem;
}
.shelf-card .tab {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.6rem;
  border-radius: 5px;
  margin-bottom: 0.55rem;
  color: #0e0e11;
}
.tab-orange { background: var(--accent); color: #fff; }
.tab-teal { background: var(--teal); color: #06231d; }
.tab-purple { background: var(--purple); color: #17093a; }
.shelf-card p { margin: 0; color: var(--muted); }
.shelf-card .line { display: block; height: 8px; border-radius: 4px; background: var(--surface-2); margin: 0.5rem 0; }
.shelf-card .line.short { width: 62%; }
.shelf-card .line.mid { width: 80%; }
.shelf-more { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); text-align: center; margin: 0.2rem 0 0; }

/* ---------- Sections ---------- */
section { padding: 3.25rem 0; }
section.alt { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
@media (prefers-color-scheme: light) {
  section.alt { background: var(--surface-2); }
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.015em;
  margin: 0 0 0.6rem;
}
.section-intro { color: var(--muted); max-width: 44em; margin: 0 0 2rem; }

/* Problem / solution */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
@media (max-width: 780px) { .split { grid-template-columns: 1fr; } }
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
}
section.alt .panel { background: var(--bg); }
.panel h3 { margin: 0 0 0.7rem; font-size: 1.15rem; }
.panel h3 .dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 0.5rem; }
.dot-orange { background: var(--accent); }
.dot-teal { background: var(--teal); }
.panel ul { margin: 0; padding-left: 1.2rem; color: var(--muted); }
.panel li { margin: 0.45rem 0; }
.panel li strong { color: var(--text); }

/* Features grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
}
@media (max-width: 900px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .features-grid { grid-template-columns: 1fr; } }
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}
section.alt .feature { background: var(--bg); }
.feature:nth-child(3n+2) { border-top-color: var(--teal); }
.feature:nth-child(3n) { border-top-color: var(--purple); }
.feature h3 { margin: 0 0 0.45rem; font-size: 1.05rem; }
.feature p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* Topic chips */
.chips { display: flex; flex-wrap: wrap; gap: 0.55rem; list-style: none; padding: 0; margin: 1.25rem 0 0; }
.chips li {
  font-family: var(--mono);
  font-size: 0.85rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.85rem;
}

/* How it helps */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid; gap: 1rem; max-width: 46em; }
.steps li {
  counter-increment: step;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.3rem 1.1rem 3.6rem;
  position: relative;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 1.1rem;
  top: 1.15rem;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-weight: 700;
  display: grid;
  place-items: center;
  font-size: 0.9rem;
}
.steps h3 { margin: 0 0 0.3rem; font-size: 1.02rem; }
.steps p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* FAQ */
.faq details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.8rem;
  overflow: hidden;
}
section.alt .faq details { background: var(--bg); }
.faq summary {
  cursor: pointer;
  padding: 1rem 1.3rem;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--mono);
  font-size: 1.3rem;
  color: var(--accent);
  flex: none;
}
.faq details[open] summary::after { content: "\2013"; }
.faq .faq-a { padding: 0 1.3rem 1.15rem; color: var(--muted); }
.faq .faq-a p { margin: 0 0 0.6rem; }
.faq .faq-a p:last-child { margin-bottom: 0; }

/* Guides cards */
.guide-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.1rem; }
@media (max-width: 720px) { .guide-cards { grid-template-columns: 1fr; } }
.guide-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
  text-decoration: none;
  color: var(--text);
}
.guide-card:hover { border-color: var(--accent); color: var(--text); }
.guide-card .gk { font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--teal); }
.guide-card h3 { margin: 0.35rem 0 0.4rem; font-size: 1.08rem; }
.guide-card p { margin: 0; color: var(--muted); font-size: 0.93rem; }

/* Final CTA */
.final-cta { text-align: center; }
.final-cta .cta-row { justify-content: center; }
.final-cta p { color: var(--muted); max-width: 38em; margin: 0 auto 1.6rem; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0 2.75rem;
  color: var(--muted);
  font-size: 0.92rem;
}
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 2rem; }
@media (max-width: 720px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer h3 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text); margin: 0 0 0.7rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 0.4rem 0; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); }
.footer-meta { margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--border); font-size: 0.85rem; }

/* ---------- Guide article pages ---------- */
.article-header { padding: 2.75rem 0 0.5rem; }
.breadcrumb { font-size: 0.88rem; color: var(--muted); margin: 0 0 1.2rem; }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 0.35rem; padding: 0; margin: 0; }
.breadcrumb li + li::before { content: "/"; margin-right: 0.35rem; color: var(--border); }
.article h1 { font-size: clamp(1.7rem, 4vw, 2.4rem); line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 0.6rem; }
.article .byline { color: var(--muted); font-size: 0.9rem; font-family: var(--mono); }
.article-body { max-width: 46em; padding-bottom: 3rem; }
.article-body h2 { font-size: 1.45rem; margin: 2.2rem 0 0.6rem; }
.article-body h3 { font-size: 1.12rem; margin: 1.7rem 0 0.5rem; }
.article-body p, .article-body li { color: var(--text); }
.article-body ul, .article-body ol { padding-left: 1.35rem; }
.article-body li { margin: 0.4rem 0; }
.article-body code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.08em 0.35em;
}
.article-body pre {
  background: var(--code-bg);
  color: #e8e8ec;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.55;
}
.article-body pre code { background: none; border: none; padding: 0; color: inherit; }
.article-body blockquote {
  margin: 1.4rem 0;
  padding: 0.2rem 1.2rem;
  border-left: 3px solid var(--teal);
  color: var(--muted);
  font-style: italic;
}
.app-help {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.3rem 1.5rem;
  margin: 2.4rem 0;
}
.app-help h2 { margin-top: 0.2rem; }
.related { border-top: 1px solid var(--border); padding-top: 1.6rem; margin-top: 2.4rem; }
.related h2 { font-size: 1.1rem; }
.related ul { padding-left: 1.2rem; }