/* Altair — batteries-included web framework for Crystal.
 * Design system. The palette is drawn from the logo: deep navy
 * (#102030), slate (#304050), the red mark (#d05050) and an
 * off-white canvas (#f0f0f0). */

:root {
  --bg: #ffffff;
  --bg-soft: #f0f3f7;
  --bg-soft-2: #e8edf3;
  --border: #d7dee6;
  --border-strong: #c3ccd7;
  --text: #102030;
  --muted: #5a6b7d;
  --navy: #102030;
  --slate: #304050;
  --red: #d05050;
  --red-strong: #c03f3f;
  --red-soft: #fdf0f0;
  --code-bg: #0d1b2a;
  --code-border: #22374f;
  --max-width: 1080px;
  --content-width: 760px;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgba(16, 32, 48, 0.06), 0 4px 16px rgba(16, 32, 48, 0.05);
  --shadow-lg: 0 2px 6px rgba(16, 32, 48, 0.08), 0 12px 32px rgba(16, 32, 48, 0.1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.7rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.brand {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--navy);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.brand-logo {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  box-shadow: var(--shadow);
}

.brand:hover { text-decoration: none; color: var(--red-strong); }
.brand:hover .brand-logo { box-shadow: var(--shadow-lg); }

.nav-links {
  display: flex;
  gap: 1.15rem;
  font-size: 0.94rem;
  font-weight: 500;
  flex-wrap: wrap;
}
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--navy); text-decoration: none; }
.nav-links a.is-active { color: var(--navy); }

/* ---------- Hero ---------- */

.hero {
  text-align: center;
  padding: 3.5rem 1.25rem 3rem;
  background:
    radial-gradient(60rem 22rem at 50% -8rem, rgba(16, 32, 48, 0.08), transparent),
    linear-gradient(180deg, var(--bg-soft), var(--bg));
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.25rem;
}

.hero .logo {
  width: 112px;
  height: 112px;
  margin: 0 auto 1.5rem;
  display: block;
  border-radius: 22px;
  box-shadow: var(--shadow-lg);
}

.hero h1 {
  font-size: 3rem;
  margin: 0 0 0.6rem;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero .tagline {
  font-size: 1.25rem;
  color: var(--muted);
  margin: 0 0 1.5rem;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.hero .badges {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin: 0 0 1.75rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--slate);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.28rem 0.85rem;
}

.badge b { color: var(--red-strong); }

.button-row { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; margin: 0 0 1.5rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.68rem 1.5rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid var(--navy);
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--navy); color: #ffffff; }
.btn-primary:hover { background: var(--slate); border-color: var(--slate); }
.btn-secondary { color: var(--navy); background: #ffffff; }
.btn-secondary:hover { background: var(--bg-soft); border-color: var(--border-strong); }

/* ---------- Main content ---------- */

.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.content-narrow { max-width: var(--content-width); margin: 0 auto; }

h1, h2, h3, h4 {
  color: var(--navy);
  line-height: 1.3;
  margin: 1.7em 0 0.55em;
  font-weight: 700;
}
h1 { font-size: 2.1rem; letter-spacing: -0.02em; margin-top: 0.4em; }
h2 { font-size: 1.45rem; padding-bottom: 0.35em; border-bottom: 1px solid var(--border); }
h3 { font-size: 1.12rem; }
h4 { font-size: 1rem; }
h1 + p, h2 + p { margin-top: 0.45em; }

p { margin: 0.85em 0; }

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.12em 0.38em;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  overflow-x: auto;
  line-height: 1.55;
  margin: 1.15em 0;
}
pre code { background: none; border: none; padding: 0; font-size: 0.87rem; color: #e6edf3; }

blockquote {
  margin: 1.15em 0;
  padding: 0.15em 1.2em;
  border-left: 3px solid var(--red);
  background: var(--bg-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
blockquote p { margin: 0.6em 0; }

hr { border: none; border-top: 1px solid var(--border); margin: 2.25rem 0; }

table { border-collapse: collapse; width: 100%; margin: 1.15em 0; font-size: 0.94rem; }
th, td { border: 1px solid var(--border); padding: 0.55rem 0.85rem; text-align: left; }
th { background: var(--bg-soft); font-weight: 700; }
tr:nth-child(even) td { background: var(--bg-soft); }
tr:nth-child(even) th { background: var(--bg-soft); }

ul, ol { padding-left: 1.5em; }
li { margin: 0.35em 0; }
li::marker { color: var(--red); }

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

/* ---------- Feature grid ---------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.1rem;
  margin: 1.5rem 0;
}

.feature {
  background: #ffffff;
  border: 1px solid var(--border);
  border-top: 3px solid var(--red);
  border-radius: var(--radius);
  padding: 1.2rem 1.25rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.feature:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.feature h3 { margin: 0 0 0.4rem; font-size: 1.02rem; }
.feature p { margin: 0; font-size: 0.92rem; color: var(--muted); }

/* ---------- Copy box ---------- */

.copy-box {
  position: relative;
  max-width: 640px;
  margin: 1.25rem auto 0;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius);
  padding: 0.85rem 1.1rem;
  text-align: left;
  overflow-x: auto;
}
.copy-box code {
  display: block;
  background: none;
  border: none;
  padding-right: 4.5rem;
  white-space: pre-wrap;
  word-break: break-all;
  color: #e6edf3;
}
.copy-box .code-block__copy {
  position: absolute;
  top: 50%;
  right: 0.6rem;
  transform: translateY(-50%);
}

/* ---------- Docs layout ---------- */

.docs-layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.docs-sidebar {
  position: sticky;
  top: 5rem;
  font-size: 0.9rem;
}

.docs-sidebar h4 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  margin: 1.4em 0 0.4em;
  border: none;
  padding: 0;
}
.docs-sidebar h4:first-child { margin-top: 0.2em; }

.docs-sidebar ul { list-style: none; padding: 0; margin: 0; }
.docs-sidebar li { margin: 0.1em 0; }
.docs-sidebar a {
  display: block;
  padding: 0.28rem 0.7rem;
  color: var(--slate);
  border-radius: 6px;
  border-left: 2px solid transparent;
}
.docs-sidebar a:hover { background: var(--bg-soft); color: var(--navy); text-decoration: none; }
.docs-sidebar a.is-active {
  color: var(--red-strong);
  font-weight: 600;
  background: var(--red-soft);
  border-left-color: var(--red);
}

.docs-content { min-width: 0; }

/* Next / previous links at the bottom of a guide */
.docs-pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
}
.docs-pager a { max-width: 45%; }
.docs-pager .label { display: block; font-size: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.docs-pager .right { text-align: right; margin-left: auto; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 2rem 1.5rem 2.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}
.site-footer p { margin: 0.25rem 0; }
.site-footer a { color: var(--slate); }
.site-footer a:hover { color: var(--red-strong); }
.footer-brand { font-weight: 800; color: var(--navy); }

/* ---------- Misc ---------- */

.muted { color: var(--muted); }

.callout {
  background: var(--red-soft);
  border: 1px solid #f0c9c9;
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.1rem;
  margin: 1.15em 0;
  font-size: 0.95rem;
}
.callout b { color: var(--red-strong); }

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .docs-layout { grid-template-columns: 1fr; gap: 0.5rem; }
  .docs-sidebar { position: static; }
  .hero h1 { font-size: 2.4rem; }
  .site-nav { padding: 0.7rem 1rem; }
  .site-main { padding: 0 1rem 2.5rem; }
}