/* Toolstem — design tokens & base */
:root,
[data-theme='light'] {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  --space-1: 0.25rem;  --space-2: 0.5rem;   --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem;  --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem;  --space-12: 3rem;
  --space-16: 4rem;    --space-20: 5rem;    --space-24: 6rem;

  /* Custom palette — engineering / financial / x402-native.
     Cool slate base, single primary accent (teal-cyan that matches x402 ecosystem),
     warm-amber for x402 highlights (a nod to Coinbase orange without being it). */
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-surface-2: #f5f5f4;
  --color-surface-offset: #efeeec;
  --color-border: #e5e4e1;
  --color-divider: #ececea;

  --color-text: #15171a;
  --color-text-muted: #4a4f57;          /* darkened for AA contrast (was #5b6068) */
  --color-text-faint: #6b7079;          /* darkened for AA contrast (was #989ba1) */
  --color-text-inverse: #fafafa;

  --color-primary: #0e7c86;          /* x402 teal */
  --color-primary-hover: #0a5a62;
  --color-primary-active: #073e44;
  --color-primary-highlight: #d4ebee;

  --color-accent: #b45309;           /* warm amber for x402 callouts */
  --color-accent-hover: #92400e;
  --color-success: #166534;
  --color-error: #991b1b;

  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;

  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px rgba(20, 22, 25, 0.05);
  --shadow-md: 0 4px 12px rgba(20, 22, 25, 0.07);
  --shadow-lg: 0 12px 32px rgba(20, 22, 25, 0.10);

  --content-narrow: 720px;
  --content-default: 1000px;
  --content-wide: 1200px;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-display: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}

[data-theme='dark'] {
  --color-bg: #0a0b0d;
  --color-surface: #111316;
  --color-surface-2: #16191d;
  --color-surface-offset: #1c2025;
  --color-border: #2a2e34;
  --color-divider: #1f2227;

  --color-text: #e8eaed;
  --color-text-muted: #b0b4ba;          /* lightened for AA contrast (was #9aa0a6) */
  --color-text-faint: #80858c;          /* lightened for AA contrast (was #5f6368) */
  --color-text-inverse: #0a0b0d;

  --color-primary: #4fb8c2;
  --color-primary-hover: #6ec8d2;
  --color-primary-active: #2d97a1;
  --color-primary-highlight: #1a3a3e;

  --color-accent: #f59e0b;
  --color-accent-hover: #fbbf24;
  --color-success: #4ade80;
  --color-error: #f87171;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0a0b0d;
    --color-surface: #111316;
    --color-surface-2: #16191d;
    --color-surface-offset: #1c2025;
    --color-border: #2a2e34;
    --color-divider: #1f2227;
    --color-text: #e8eaed;
    --color-text-muted: #b0b4ba;
    --color-text-faint: #80858c;
    --color-text-inverse: #0a0b0d;
    --color-primary: #4fb8c2;
    --color-primary-hover: #6ec8d2;
    --color-primary-active: #2d97a1;
    --color-primary-highlight: #1a3a3e;
    --color-accent: #f59e0b;
    --color-accent-hover: #fbbf24;
    --color-success: #4ade80;
    --color-error: #f87171;
  }
}

/* base reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: none; text-size-adjust: none;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility; scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
}
body {
  min-height: 100dvh; line-height: 1.6;
  font-family: var(--font-body); font-size: var(--text-base);
  color: var(--color-text); background-color: var(--color-bg);
}
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.2; font-family: var(--font-display); font-weight: 600; letter-spacing: -0.015em; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); text-decoration: underline; text-underline-offset: 3px; }
::selection { background: var(--color-primary-highlight); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}
a, button, [role='button'], input, textarea, select {
  transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }

/* Skip link for keyboard users */
.skip-link {
  position: absolute; top: 0; left: 0;
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary); color: var(--color-text-inverse);
  font-size: var(--text-sm); font-weight: 500;
  text-decoration: none; border-radius: 0 0 var(--radius-md) 0;
  transform: translateY(-100%);
  z-index: 100;
}
.skip-link:focus { transform: translateY(0); color: var(--color-text-inverse); text-decoration: none; }

/* ─── layout ─── */
.container { max-width: var(--content-default); margin-inline: auto; padding-inline: var(--space-6); }
.container--wide { max-width: var(--content-wide); }
.container--narrow { max-width: var(--content-narrow); }

/* ─── header ─── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: var(--space-4);
}
.site-header__brand {
  display: flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-base); letter-spacing: -0.01em;
  color: var(--color-text); text-decoration: none;
}
.site-header__brand:hover { color: var(--color-primary); text-decoration: none; }
.site-header__brand svg { width: 24px; height: 24px; color: var(--color-primary); }
.site-nav { display: flex; align-items: center; gap: var(--space-6); }
.site-nav a { color: var(--color-text-muted); font-size: var(--text-sm); font-weight: 500; text-decoration: none; }
.site-nav a:hover { color: var(--color-text); text-decoration: none; }
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: var(--radius-md);
  color: var(--color-text-muted);
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-2); }
.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text);
}
.nav-toggle:hover { background: var(--color-surface-2); }
@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-2) var(--space-6) var(--space-4);
    box-shadow: var(--shadow-md);
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }
  .site-nav--open {
    transform: translateY(0); opacity: 1; pointer-events: auto;
  }
  .site-nav a {
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-divider);
    font-size: var(--text-base);
  }
  .site-nav a:last-of-type { border-bottom: none; }
  .theme-toggle { align-self: flex-start; margin-top: var(--space-2); }
}

/* ─── buttons ─── */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm); font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}
.btn--primary { background: var(--color-primary); color: var(--color-text-inverse); }
.btn--primary:hover { background: var(--color-primary-hover); color: var(--color-text-inverse); text-decoration: none; }
.btn--ghost { color: var(--color-text); border-color: var(--color-border); }
.btn--ghost:hover { background: var(--color-surface-2); color: var(--color-text); text-decoration: none; }
.btn svg { width: 16px; height: 16px; }

/* ─── hero ─── */
.hero {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  border-bottom: 1px solid var(--color-divider);
}
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono); font-size: var(--text-xs);
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--color-primary-active);              /* darker variant for AA contrast on highlight bg */
  background: var(--color-primary-highlight);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}
[data-theme='dark'] .hero__eyebrow { color: var(--color-primary-hover); }
.hero__eyebrow::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.hero h1 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-6);
  max-width: 18ch;
}
.hero__lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-8);
}
.hero__cta { display: flex; gap: var(--space-3); flex-wrap: wrap; }

/* ─── code blocks ─── */
.code-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  margin-block: var(--space-4);
}
.code-block__header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
}
.code-block pre {
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  line-height: 1.55;
  font-size: 0.875rem;
  color: var(--color-text);
}
.code-block code { font-family: inherit; }
.code-block .kw { color: var(--color-primary); }
.code-block .str { color: var(--color-accent); }
.code-block .cmt { color: var(--color-text-faint); }

/* ─── product grid ─── */
.products {
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}
.products__grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}
@media (max-width: 720px) { .products__grid { grid-template-columns: 1fr; } }
.product-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex; flex-direction: column; gap: var(--space-4);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.product-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); }
.product-card__tag {
  display: inline-block; align-self: flex-start;
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono); font-size: var(--text-xs);
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
}
.product-card h3 {
  font-size: var(--text-xl);
  letter-spacing: -0.02em;
}
.product-card p { color: var(--color-text-muted); }
.product-card__meta {
  display: flex; gap: var(--space-4); flex-wrap: wrap;
  font-size: var(--text-sm); color: var(--color-text-muted);
  margin-top: auto; padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}
.product-card__meta strong { color: var(--color-text); font-weight: 600; }
.product-card__link {
  display: inline-flex; align-items: center; gap: var(--space-2);
  color: var(--color-primary); font-size: var(--text-sm); font-weight: 500;
}
.product-card__link svg { width: 14px; height: 14px; }

/* ─── section ─── */
.section { padding-block: clamp(var(--space-12), 6vw, var(--space-20)); }
.section--alt { background: var(--color-surface); border-block: 1px solid var(--color-divider); }
.section__title { font-size: var(--text-xl); margin-bottom: var(--space-3); }
.section__lede { font-size: var(--text-base); color: var(--color-text-muted); margin-bottom: var(--space-10); max-width: 60ch; }

/* ─── feature row ─── */
.features {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}
@media (max-width: 800px) { .features { grid-template-columns: 1fr; gap: var(--space-6); } }
.feature h4 { font-size: var(--text-base); font-weight: 600; margin-bottom: var(--space-2); }
.feature p { font-size: var(--text-sm); color: var(--color-text-muted); }
.feature__icon {
  width: 32px; height: 32px;
  display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: var(--space-3);
  color: var(--color-primary);
}

/* ─── status row ─── */
.status-row {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
@media (max-width: 720px) { .status-row { grid-template-columns: repeat(2, 1fr); } }
.status-cell__label {
  font-family: var(--font-mono); font-size: var(--text-xs);
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}
.status-cell__value {
  font-family: var(--font-mono); font-size: var(--text-lg);
  color: var(--color-text); font-weight: 500;
}
.status-cell__value--ok::before {
  content: ''; display: inline-block; width: 8px; height: 8px;
  border-radius: 50%; background: var(--color-success);
  margin-right: var(--space-2); vertical-align: middle;
}

/* ─── integrations ─── */
.integrations {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
}
.integration {
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.integration h4 { font-size: var(--text-sm); font-weight: 600; margin-bottom: var(--space-2); }
.integration p { font-size: var(--text-xs); color: var(--color-text-muted); margin-bottom: var(--space-3); }
.integration__code {
  font-family: var(--font-mono); font-size: var(--text-xs);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-2);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  overflow-x: auto;
}

/* ─── footer ─── */
.site-footer {
  padding-block: var(--space-12);
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
  margin-top: var(--space-16);
}
.site-footer__grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}
@media (max-width: 720px) {
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
}
.site-footer__brand p { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-3); max-width: 36ch; }
.footer-col__heading {
  font-family: var(--font-mono); font-size: var(--text-xs);
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4); font-weight: 500;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col a { color: var(--color-text); font-size: var(--text-sm); }
.footer-col a:hover { color: var(--color-primary); }
.site-footer__bottom {
  padding-top: var(--space-6); border-top: 1px solid var(--color-divider);
  font-size: var(--text-xs); color: var(--color-text-faint);
  display: flex; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap;
}

/* ─── prose (privacy/terms) ─── */
.prose { max-width: 68ch; }
.prose h1 { font-size: var(--text-xl); margin-bottom: var(--space-4); }
.prose h2 { font-size: var(--text-lg); margin-top: var(--space-10); margin-bottom: var(--space-3); }
.prose h3 { font-size: var(--text-base); margin-top: var(--space-6); margin-bottom: var(--space-2); }
.prose p, .prose ul, .prose ol { margin-bottom: var(--space-4); color: var(--color-text); }
.prose ul, .prose ol { padding-left: var(--space-6); }
.prose li { margin-bottom: var(--space-2); }
.prose strong { font-weight: 600; }
.prose code {
  font-family: var(--font-mono); font-size: 0.875em;
  padding: 0.1em 0.4em; background: var(--color-surface-2);
  border-radius: var(--radius-sm);
}
.prose hr { border: 0; border-top: 1px solid var(--color-divider); margin-block: var(--space-8); }
.prose .meta {
  font-size: var(--text-xs); color: var(--color-text-muted);
  font-family: var(--font-mono); margin-bottom: var(--space-8);
}

/* ─── tables (docs) ─── */
.table-wrap { overflow-x: auto; margin-block: var(--space-6); border: 1px solid var(--color-border); border-radius: var(--radius-md); }
table { width: 100%; border-collapse: collapse; font-size: var(--text-sm); }
th, td { padding: var(--space-3) var(--space-4); text-align: left; border-bottom: 1px solid var(--color-divider); }
th { background: var(--color-surface-2); font-weight: 600; font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); }
tr:last-child td { border-bottom: none; }
td code { font-family: var(--font-mono); font-size: 0.875em; }