:root {
  --bg: #fbfbfd;
  --surface: #ffffff;
  --surface-muted: #f3f4f6;
  --surface-soft: #eef4ff;
  --surface-soft-2: #f4f7fc;
  --border: #e3e7ef;
  --border-strong: #d1d5db;
  --text: #172033;
  --text-muted: #4b5563;
  --text-faint: #6b7280;
  --accent: #1d4ed8;
  --accent-strong: #1e40af;
  --accent-soft: #dbeafe;
  --accent-soft-2: #eff6ff;
  --shadow-soft: 0 1px 2px rgba(15, 23, 42, 0.04), 0 12px 32px rgba(15, 23, 42, 0.05);
  --radius: 0.85rem;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
}

.site-shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header,
.site-footer {
  padding: 1rem 1.25rem;
}

.site-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.85);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(8px);
}

.brand {
  font-weight: 800;
  color: #111827;
  text-decoration: none;
  letter-spacing: -0.03em;
  font-size: 1.15rem;
}

.site-nav {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  align-items: center;
  font-size: 0.95rem;
}

.site-nav a,
.page a {
  color: var(--accent);
  text-decoration: none;
}

.site-nav a:hover,
.page a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.page {
  max-width: 920px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.tool-doc-page .page {
  max-width: 1180px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 0.5rem;
}

h1, h2, h3 {
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: #0f172a;
}

h1 { font-size: 2.6rem; margin: 0 0 1rem; }
h2 { font-size: 1.7rem; margin: 0 0 0.75rem; }
h3 { font-size: 1.2rem; margin: 0 0 0.5rem; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 2.5rem;
  padding: 2.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(135deg, #ffffff, var(--surface-soft));
  box-shadow: var(--shadow-soft);
}

.hero h1 {
  font-size: 3rem;
  margin: 0 0 1rem;
  background: linear-gradient(135deg, #0f172a, var(--accent-strong));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lede {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin: 0 0 1.5rem;
  max-width: 38ch;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.1rem;
  border-radius: 0.65rem;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}

.button:hover {
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(29, 78, 216, 0.18);
}

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

.button-primary:hover {
  background: var(--accent-strong);
  color: #ffffff;
}

.button-secondary {
  background: #ffffff;
  color: var(--accent);
  border-color: var(--border-strong);
}

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-panel {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.75rem;
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.04);
}

.hero-panel-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-faint);
}

.hero-stat {
  font-size: 3.4rem;
  font-weight: 800;
  color: var(--accent-strong);
  letter-spacing: -0.04em;
  line-height: 1;
}

.hero-stat span {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0;
  margin-top: 0.4rem;
}

.hero-panel p {
  margin: 0;
  color: var(--text-muted);
}

.principles {
  margin-top: 3rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: 2rem;
  align-items: start;
}

.principles h2 {
  margin: 0;
}

.principles p {
  color: var(--text-muted);
  margin: 0;
  font-size: 1.05rem;
}

.tool-section {
  margin-top: 3rem;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.section-heading h2 {
  margin: 0;
  font-size: 2rem;
}

.text-link {
  font-weight: 600;
  font-size: 0.95rem;
}

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

.tool-cards {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.card:hover {
  border-color: var(--accent);
  box-shadow: 0 10px 24px rgba(29, 78, 216, 0.08);
  transform: translateY(-2px);
}

.card h3 {
  margin: 0;
  font-size: 1.15rem;
  color: #0f172a;
}

.card-label {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-faint);
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: auto;
  font-size: 0.9rem;
  font-weight: 600;
}

.next-step {
  margin-top: 3.5rem;
  padding: 2rem;
  border-radius: var(--radius);
  background: var(--surface-soft-2);
  border: 1px solid var(--border);
}

.next-step h2 {
  margin: 0 0 0.5rem;
}

.next-step p {
  margin: 0;
  color: var(--text-muted);
}

.notice {
  padding: 1rem;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft-2);
}

code,
pre {
  background: var(--surface-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
}

code {
  padding: 0.1rem 0.35rem;
  border-radius: 0.35rem;
}

pre {
  overflow-x: auto;
  padding: 1rem;
  border-radius: 0.65rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.9rem;
}

/* Tools dropdown in the site header. */
.nav-dropdown {
  position: relative;
}

.nav-dropdown summary {
  list-style: none;
  cursor: pointer;
  padding: 0.35rem 0.65rem;
  border-radius: 0.5rem;
  color: var(--accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-dropdown summary::-webkit-details-marker {
  display: none;
}

.nav-dropdown summary::after {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  margin-left: 0.2rem;
  margin-top: -0.15rem;
  transition: transform 0.15s ease;
}

.nav-dropdown[open] summary::after {
  transform: rotate(-135deg);
  margin-top: 0.2rem;
}

.nav-dropdown summary:hover {
  background: var(--accent-soft-2);
  text-decoration: none;
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 0.4rem);
  right: 0;
  min-width: 240px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
  padding: 0.45rem;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  z-index: 20;
}

.nav-dropdown-menu a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.65rem;
  border-radius: 0.5rem;
  color: var(--text);
  font-weight: 500;
}

.nav-dropdown-menu a:hover {
  background: var(--accent-soft-2);
  color: var(--accent-strong);
  text-decoration: none;
}

.nav-dropdown-all {
  font-weight: 600;
  color: var(--accent) !important;
  border-bottom: 1px solid var(--border);
  border-radius: 0.5rem 0.5rem 0 0 !important;
  margin-bottom: 0.25rem;
  padding-bottom: 0.6rem !important;
}

.nav-item-type {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--text-faint);
  background: var(--surface-muted);
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
}

.nav-dropdown-menu a:hover .nav-item-type {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

/* Per-tool documentation layout: left nav + content. */
.tool-layout {
  display: grid;
  grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
}

.tool-nav {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
  font-size: 0.95rem;
}

.tool-nav-menu {
  display: block;
}

.tool-nav-title {
  display: block;
  margin: 0 0 0.75rem;
  font-weight: 700;
  text-transform: lowercase;
  color: #111827;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.tool-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--border);
}

.tool-nav li {
  margin: 0;
}

.tool-nav ul a {
  display: block;
  padding: 0.35rem 0.75rem;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: #374151;
  text-decoration: none;
  line-height: 1.4;
}

.tool-nav-title:hover,
.tool-nav ul a:hover {
  color: var(--accent);
  text-decoration: none;
}

.tool-nav ul a:hover {
  background: var(--surface-muted);
}

.tool-nav ul a.active {
  color: var(--accent);
  font-weight: 600;
  border-left-color: var(--accent);
  background: var(--accent-soft-2);
}

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

@media (max-width: 880px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    padding: 2rem;
  }

  .principles {
    grid-template-columns: minmax(0, 1fr);
  }

  .nav-dropdown-menu {
    right: -1rem;
  }
}

@media (max-width: 720px) {
  .site-header {
    position: static;
  }

  .tool-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
  }

  .tool-nav {
    position: static;
    max-height: none;
    overflow: visible;
  }

  .hero h1 { font-size: 2.2rem; }
}