/* er7-rust.github.io — site stylesheet
 *
 * Base: the Lily Design System™ site stylesheet, taken from
 * lilydesignsystem.github.io. Lily supplies the token vocabulary
 * (--lily-*) and the component classes (.card, .callout, .hero, .stat,
 * .tag, .prose, .site-*). Do not diverge from those: to restyle, change a
 * token, and to add a component, add it to the "er7 additions" block at
 * the end of this file rather than editing Lily's rules in place.
 *
 * Lily Design System™ is free open source: MIT, Apache-2.0, GPL-2.0,
 * GPL-3.0, or BSD-3-Clause. https://github.com/LilyDesignSystem
 */

:root {
  --lily-primary: #2563eb;
  --lily-primary-hover: #1d4ed8;
  --lily-accent: #005eb8;
  --lily-danger: #dc2626;
  --lily-warning: #f59e0b;
  --lily-success: #16a34a;
  --lily-page-bg: #f9fafb;
  --lily-card-bg: #ffffff;
  --lily-text: #111827;
  --lily-text-muted: #4b5563;
  --lily-text-subtle: #6b7280;
  --lily-border: #e5e7eb;
  --lily-border-strong: #d1d5db;
  --lily-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.08), 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --lily-shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --lily-radius: 0.5rem;
  --lily-radius-lg: 0.75rem;
  --lily-content-max: 72rem;
  --lily-prose-max: 42rem;
  --lily-font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --lily-font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--lily-font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--lily-text);
  background: var(--lily-page-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--lily-primary);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}
a:hover { color: var(--lily-primary-hover); }
a:focus-visible {
  outline: 3px solid var(--lily-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin: 2rem 0 1rem;
}
h1 { font-size: 2.5rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.375rem; }
h4 { font-size: 1.125rem; }

p { margin: 0 0 1rem; }

code, pre {
  font-family: var(--lily-font-mono);
  font-size: 0.9em;
}
code {
  background: #eef2ff;
  color: #312e81;
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: var(--lily-radius);
  overflow-x: auto;
  line-height: 1.5;
}
pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

kbd {
  font-family: var(--lily-font-mono);
  font-size: 0.85em;
  background: var(--lily-card-bg);
  border: 1px solid var(--lily-border-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0.1em 0.4em;
}

/* Header & navigation */

.site-header {
  background: var(--lily-card-bg);
  border-bottom: 1px solid var(--lily-border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--lily-shadow);
}

.site-header-inner {
  max-width: var(--lily-content-max);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--lily-text);
  text-decoration: none;
}
.site-brand:hover { color: var(--lily-primary); }
.site-brand-mark { width: 1.75rem; height: 1.75rem; display: inline-block; vertical-align: middle; }

.site-nav {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--lily-text-muted);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: var(--lily-radius);
  font-size: 0.95rem;
  transition: background 150ms;
}
.site-nav a:hover { background: var(--lily-border); color: var(--lily-text); }
.site-nav a[aria-current="page"] {
  color: var(--lily-primary);
  font-weight: 600;
  background: #eef2ff;
}

/* Main content */

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

.prose { max-width: var(--lily-prose-max); }
.prose ul, .prose ol { padding-left: 1.5rem; }
.prose li { margin-bottom: 0.25rem; }

/* Hero */

.hero {
  text-align: center;
  padding: 2.5rem 1rem 1rem;
  max-width: 48rem;
  margin: 0 auto;
}
.hero-logo {
  display: block;
  width: clamp(5rem, 12vw, 7.5rem);
  height: auto;
  margin: 0 auto 1rem;
}
.hero .stat-row {
  margin: 1.5rem 0 0;
  gap: 1rem;
}
.hero-eyebrow {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--lily-primary);
  background: #eef2ff;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  margin: 0.5rem 0 1rem;
  background: linear-gradient(135deg, var(--lily-primary), var(--lily-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-tagline {
  font-size: 1.25rem;
  color: var(--lily-text-muted);
  margin: 0 auto 2rem;
  max-width: 36rem;
}

/* Buttons */

.button {
  display: inline-block;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--lily-radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 150ms;
  line-height: 1.2;
}
.button-primary {
  background: var(--lily-primary);
  color: #fff;
  border-color: var(--lily-primary);
}
.button-primary:hover {
  background: var(--lily-primary-hover);
  border-color: var(--lily-primary-hover);
  color: #fff;
}
.button-secondary {
  background: var(--lily-card-bg);
  color: var(--lily-primary);
  border-color: var(--lily-primary);
}
.button-secondary:hover {
  background: #eef2ff;
}

.button-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin: 1.5rem 0;
}

/* Card grids */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.card {
  background: var(--lily-card-bg);
  border: 1px solid var(--lily-border);
  border-radius: var(--lily-radius-lg);
  padding: 1.5rem;
  box-shadow: var(--lily-shadow);
  transition: transform 150ms, box-shadow 150ms;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--lily-shadow-lg);
}
.card-heading {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}
.card-description {
  margin: 0 0 1rem;
  color: var(--lily-text-muted);
}
.card-meta {
  font-size: 0.875rem;
  color: var(--lily-text-subtle);
  margin: 0;
}

a.card { color: inherit; text-decoration: none; }
a.card:hover { color: inherit; }

/* Sections */

.section {
  margin: 4rem 0;
}
.section-heading {
  text-align: center;
  margin-bottom: 2rem;
}
.section-heading-eyebrow {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--lily-primary);
  margin: 0 0 0.5rem;
}
.section-heading h2 {
  margin: 0;
}

/* Stat row */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: 2rem;
  margin: 2rem 0;
  text-align: center;
}
.stat {
  padding: 1rem;
}
.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--lily-primary);
  line-height: 1;
  margin: 0;
}
.stat-label {
  font-size: 0.95rem;
  color: var(--lily-text-muted);
  margin: 0.5rem 0 0;
}

/* Footer */

.site-footer {
  background: var(--lily-card-bg);
  border-top: 1px solid var(--lily-border);
  margin-top: 4rem;
  padding: 2rem 1.5rem;
}
.site-footer-inner {
  max-width: var(--lily-content-max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95rem;
  color: var(--lily-text-muted);
}
.site-footer p { margin: 0; }
.site-footer-links { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Component list (components.html) */

.component-search {
  display: block;
  width: 100%;
  font: inherit;
  padding: 0.75rem 1rem;
  border: 2px solid var(--lily-border-strong);
  border-radius: var(--lily-radius);
  margin-bottom: 1.5rem;
  background: var(--lily-card-bg);
}
.component-search:focus {
  outline: none;
  border-color: var(--lily-primary);
}

.component-count-line {
  font-size: 0.95rem;
  color: var(--lily-text-muted);
  margin: 0 0 1rem;
}

.component-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(20rem, 1fr));
  gap: 0.5rem;
}
.component-list-stacked {
  grid-template-columns: 1fr;
}
.component-list-item {
  background: var(--lily-card-bg);
  border: 1px solid var(--lily-border);
  border-radius: var(--lily-radius);
  padding: 0.75rem 1rem;
}
.component-list-item.is-hidden { display: none; }
.component-list-item-name {
  display: block;
  font-family: var(--lily-font-mono);
  font-size: 0.9rem;
  color: var(--lily-primary);
  font-weight: 600;
}
.component-list-item-description {
  display: block;
  font-size: 0.875rem;
  color: var(--lily-text-muted);
  margin-top: 0.25rem;
}

/* Tag list (chips for categories) */

.tag-list {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
}
.tag {
  display: inline-block;
  font-size: 0.8125rem;
  background: #eef2ff;
  color: var(--lily-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-weight: 600;
}

/* Detail/summary FAQ */

details.faq-item {
  background: var(--lily-card-bg);
  border: 1px solid var(--lily-border);
  border-radius: var(--lily-radius);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
}
details.faq-item[open] {
  border-color: var(--lily-primary);
}
details.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after {
  content: "+";
  float: right;
  font-size: 1.25rem;
  color: var(--lily-primary);
  font-weight: 400;
}
details.faq-item[open] summary::after { content: "−"; }
details.faq-item p { margin-top: 0.75rem; }

/* Skip link */

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--lily-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  text-decoration: none;
  z-index: 100;
  transition: top 150ms;
}
.skip-link:focus {
  top: 1rem;
  color: #fff;
}

/* Banner */

.callout {
  background: #eef2ff;
  border-left: 4px solid var(--lily-primary);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--lily-radius) var(--lily-radius) 0;
  margin: 1.5rem 0;
}
.callout-warning {
  background: #fff7ed;
  border-left-color: var(--lily-warning);
}
.callout-success {
  background: #f0fdf4;
  border-left-color: var(--lily-success);
}

/* Responsive helpers */

@media (max-width: 640px) {
  .site-nav { width: 100%; justify-content: flex-start; }
  .site-main { padding: 2rem 1rem; }
  .hero { padding: 2rem 1rem 1rem; }
}

/* Reduced motion */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}


/* ------------------------------------------------------------------
 * er7 additions
 *
 * Everything above is Lily. Everything below is specific to this site:
 * the ER7 message anatomy diagram, a table style, and a few helpers for
 * documentation-heavy pages. All of it is built from Lily tokens.
 * ------------------------------------------------------------------ */

/* Tables. Lily's stylesheet does not style tables, because its own site
 * has none; this site is reference documentation and is full of them. */

.prose table,
.table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.5rem;
  font-size: 0.95rem;
}

.prose table th,
.table th {
  text-align: left;
  font-weight: 700;
  padding: 0.6rem 0.75rem;
  border-bottom: 2px solid var(--lily-border-strong);
  vertical-align: top;
}

.prose table td,
.table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--lily-border);
  vertical-align: top;
}

.prose table tr:last-child td,
.table tr:last-child td {
  border-bottom: none;
}

.table-wrap {
  overflow-x: auto;
  margin: 0 0 1.5rem;
}

.table-wrap > table {
  margin-bottom: 0;
}

/* The ER7 anatomy figure: a pipe-hat message with its delimiters called
 * out. `.er7-line` keeps the monospace grid intact so the callout rules
 * line up under the characters they point at. */

.er7-figure {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: var(--lily-radius);
  padding: 1.25rem;
  overflow-x: auto;
  margin: 0 0 1.5rem;
}

.er7-line {
  font-family: var(--lily-font-mono);
  font-size: 0.9rem;
  line-height: 1.7;
  white-space: pre;
  margin: 0;
}

.er7-figure .er7-delimiter {
  color: #fbbf24;
  font-weight: 700;
}

.er7-figure .er7-segment {
  color: #7dd3fc;
  font-weight: 700;
}

.er7-figure .er7-note {
  color: #94a3b8;
}

.er7-caption {
  font-size: 0.9rem;
  color: var(--lily-text-muted);
  margin: -0.75rem 0 1.5rem;
}

/* A two-column before/after, used to show ER7 next to what it means. */

.pair-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  margin: 0 0 1.5rem;
}

@media (min-width: 48rem) {
  .pair-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.pair-grid > figure {
  margin: 0;
}

.pair-grid figcaption {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--lily-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 0.5rem;
}

.pair-grid pre {
  margin: 0;
  height: 100%;
}

/* An inline definition list for term/meaning pairs. */

.defs {
  margin: 0 0 1.5rem;
}

.defs dt {
  font-family: var(--lily-font-mono);
  font-weight: 700;
  color: var(--lily-text);
  margin-top: 1rem;
}

.defs dd {
  margin: 0.25rem 0 0;
  color: var(--lily-text-muted);
}

/* Page-level table of contents, for the long reference pages. */

.toc {
  background: var(--lily-card-bg);
  border: 1px solid var(--lily-border);
  border-radius: var(--lily-radius);
  padding: 1rem 1.25rem;
  margin: 0 0 2rem;
}

.toc h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--lily-text-muted);
  margin: 0 0 0.5rem;
}

.toc ul {
  margin: 0;
  padding-left: 1.1rem;
  columns: 2;
  column-gap: 2rem;
}

@media (max-width: 40rem) {
  .toc ul {
    columns: 1;
  }
}

.toc li {
  margin: 0.2rem 0;
  break-inside: avoid;
}

/* Anchored headings on reference pages. */

.anchor-heading {
  scroll-margin-top: 5.5rem;
}