:root {
  --font-family: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;
  --color-bg: #f6f8fb;
  --color-surface: #ffffff;
  --color-subtle: #eef1f7;
  --color-border: #d7dce5;
  --color-text: #1f2937;
  --color-muted: #4b5563;
  --color-accent: #2563eb;
  --color-accent-soft: #e0e7ff;
  --radius-large: 18px;
  --radius-medium: 12px;
  --shadow-soft: 0 12px 24px rgba(15, 23, 42, 0.08);
  --transition-quick: 0.2s ease-in-out;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  min-height: 100vh;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-quick), box-shadow var(--transition-quick);
}

a:hover,
a:focus-visible {
  color: #1d4ed8;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

img {
  max-width: 100%;
  display: block;
}

.site-wrapper {
  margin: 0 auto;
  max-width: var(--max-width);
  padding: 0 24px 80px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 24px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
}

.brand .badge {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-muted);
  background: var(--color-subtle);
  padding: 4px 8px;
  border-radius: 999px;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0;
  margin: 0;
}

.nav-link {
  color: var(--color-muted);
  font-weight: 500;
  padding: 8px 4px;
  border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-text);
}

body[data-page="home"] .nav-link[data-nav="home"],
body[data-page="docs"] .nav-link[data-nav="docs"],
body[data-page="industries"] .nav-link[data-nav="industries"],
body[data-page="validator"] .nav-link[data-nav="validator"],
body[data-page="contact"] .nav-link[data-nav="contact"] {
  color: var(--color-text);
  border-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--color-text);
  font-size: 16px;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: var(--radius-medium);
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

.hero {
  margin-top: 110px;
  background: linear-gradient(160deg, var(--color-surface) 0%, #f0f4ff 100%);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-soft);
  padding: clamp(32px, 5vw, 72px);
  text-align: center;
}

.hero h1 {
  margin: 0;
  font-size: clamp(32px, 6vw, 56px);
  letter-spacing: -0.02em;
}

.hero p {
  margin: 18px auto 24px;
  max-width: 720px;
  color: var(--color-muted);
  font-size: 18px;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 600;
  transition: transform var(--transition-quick), box-shadow var(--transition-quick);
}

.btn.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 8px 16px rgba(37, 99, 235, 0.12);
}

.section {
  margin-top: 72px;
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.section-header h2 {
  margin: 0;
  font-size: clamp(26px, 4vw, 36px);
  letter-spacing: -0.015em;
}

.section-header p {
  margin: 0;
  color: var(--color-muted);
  max-width: 720px;
}

.card-grid {
  display: grid;
  gap: 20px;
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius-large);
  border: 1px solid var(--color-border);
  padding: 28px;
  box-shadow: var(--shadow-soft);
}

.card h3 {
  margin-top: 0;
}

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

.card ul {
  margin: 16px 0 0;
  padding-left: 20px;
  color: var(--color-muted);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-radius: 999px;
  padding: 6px 12px;
  font-weight: 600;
  font-size: 14px;
}

.split-grid {
  display: grid;
  gap: 24px;
}

.highlight-list {
  margin: 0;
  padding-left: 24px;
  color: var(--color-muted);
}

.info-callout {
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-soft);
  padding: 16px 20px;
  border-radius: var(--radius-medium);
  color: var(--color-text);
}

.table-wrap {
  overflow-x: auto;
  background: var(--color-surface);
  border-radius: var(--radius-large);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 16px 18px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

th {
  background: #f3f4f6;
  font-weight: 600;
}

tbody tr:nth-child(even) {
  background: var(--color-subtle);
}

.breadcrumbs {
  font-size: 14px;
  margin-bottom: 18px;
  color: var(--color-muted);
}

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

.breadcrumbs span {
  margin: 0 6px;
}

.doc-intro {
  margin-bottom: 36px;
  color: var(--color-muted);
  max-width: 760px;
}

details.collapsible {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-soft);
  margin-top: 24px;
  padding: 0 24px;
}

details.collapsible[open] summary {
  border-bottom: 1px solid var(--color-border);
}

summary {
  cursor: pointer;
  font-weight: 600;
  padding: 18px 0;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

summary::-webkit-details-marker {
  display: none;
}

summary .summary-label {
  display: flex;
  align-items: center;
  gap: 12px;
}

summary .chevron {
  transition: transform var(--transition-quick);
}

details[open] .chevron {
  transform: rotate(180deg);
}

.collapsible-content {
  padding: 22px 0 32px;
}

pre {
  background: #f9fafb;
  border-radius: var(--radius-medium);
  border: 1px solid var(--color-border);
  padding: 18px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.5;
}

code {
  font-family: "Source Code Pro", "Menlo", "Roboto Mono", ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 14px;
}

.diagram {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  margin-top: 18px;
}

.diagram-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow-soft);
}

.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: 72px;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 36px 24px;
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  color: var(--color-muted);
}

.footer__inner strong {
  color: var(--color-text);
  font-size: 16px;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 36px;
  color: var(--color-muted);
  font-size: 14px;
}

.inline-list {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding: 0;
  margin: 8px 0 0;
  list-style: none;
}

form {
  display: grid;
  gap: 18px;
}

label {
  display: block;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

input,
textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-medium);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-family: var(--font-family);
  font-size: 16px;
}

input:focus-visible,
textarea:focus-visible {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.table-caption {
  margin-bottom: 12px;
  font-weight: 600;
  color: var(--color-text);
}

.metric-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.metric-card {
  background: var(--color-surface);
  border-radius: var(--radius-medium);
  border: 1px solid var(--color-border);
  padding: 18px;
  box-shadow: var(--shadow-soft);
}

.metric-card span {
  display: block;
  color: var(--color-muted);
  font-size: 14px;
}

.metric-card strong {
  display: block;
  font-size: 24px;
  margin-top: 4px;
}

.template-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
  color: var(--color-muted);
}

.template-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--color-subtle);
  font-size: 14px;
}

.note {
  font-size: 14px;
  color: var(--color-muted);
}

@media (min-width: 720px) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split-grid {
    grid-template-columns: 3fr 2fr;
  }
}

@media (max-width: 920px) {
  .site-header__inner {
    padding: 16px 20px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    inset: 68px 16px auto 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-large);
    box-shadow: var(--shadow-soft);
    padding: 20px;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-quick), transform var(--transition-quick);
  }

  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

@media (max-width: 640px) {
  .site-wrapper {
    padding: 0 18px 64px;
  }

  .hero {
    margin-top: 96px;
  }

  .section {
    margin-top: 56px;
  }
}