/* ============================================================
   AxiomInference — shared design system
   ============================================================ */

:root {
  --ink: #16150f;
  --ink-soft: #55534a;
  --paper: #ffffff;
  --paper-warm: #faf9f6;
  --line: #e7e5df;
  --panel: #0b0b0a;
  --panel-line: #2a2a27;
  --panel-text: #f2f0ea;
  --panel-text-soft: #a8a59b;
  --accent: #16150f;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --container: 1160px;
  --pad: clamp(20px, 4vw, 56px);
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

/* ---------- Skip link (a11y) ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 18px;
  border-radius: 0 0 8px 0;
  z-index: 200;
  font-weight: 600;
}
.skip-link:focus {
  left: 0;
}

/* ---------- Nav ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--ink);
  white-space: nowrap;
}

.brand-mark {
  width: 26px;
  height: 26px;
  flex: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 34px);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
}

.nav-links a[aria-current="page"] {
  font-weight: 600;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  transition: transform 0.15s ease, background 0.15s ease;
}

.nav-cta:hover {
  background: #2f2d24;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 12px 20px;
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn-light {
  background: var(--paper);
  color: var(--ink);
}
.btn-light:hover {
  transform: translateY(-1px);
  background: #f0efe9;
}

.btn-dark {
  background: var(--ink);
  color: var(--paper);
}
.btn-dark:hover {
  transform: translateY(-1px);
  background: #2f2d24;
}

.btn-outline {
  background: transparent;
  color: var(--panel-text);
  border-color: var(--panel-line);
}
.btn-outline:hover {
  transform: translateY(-1px);
  border-color: #4a4842;
}

.btn-arrow {
  transition: transform 0.15s ease;
}
.btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* ---------- Hero ---------- */
.hero {
  padding-top: clamp(48px, 8vw, 88px);
  padding-bottom: clamp(40px, 6vw, 64px);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 64px);
  align-items: start;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 18px;
}

.eyebrow.on-dark {
  color: var(--panel-text-soft);
}

h1.display {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0;
}

.underline {
  text-decoration: underline;
  text-decoration-thickness: 3px;
  text-underline-offset: 6px;
  text-decoration-color: var(--ink);
}

.hero-copy p {
  font-size: 1.08rem;
  color: var(--ink-soft);
  margin: 0;
  max-width: 42ch;
}

.hero-copy {
  padding-top: clamp(6px, 1.5vw, 14px);
}

/* ---------- Dark feature card ---------- */
.feature-card {
  background: var(--panel);
  color: var(--panel-text);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  min-height: 420px;
  position: relative;
  isolation: isolate;
}

.feature-card-body {
  padding: clamp(28px, 4vw, 52px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 18px;
}

.feature-card-body h2,
.feature-card-body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  margin: 0;
  letter-spacing: -0.01em;
}

.feature-card-body p {
  color: var(--panel-text-soft);
  max-width: 46ch;
  margin: 0;
  font-size: 1rem;
}

.feature-card-art {
  position: relative;
  min-height: 260px;
}

.feature-card-art svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feature-stats-row {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 36px);
  padding-top: 18px;
  margin-top: 6px;
  border-top: 1px solid var(--panel-line);
}

.feature-stat .num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  display: block;
}
.feature-stat .label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--panel-text-soft);
}

@media (max-width: 760px) {
  .feature-card {
    grid-template-columns: 1fr;
  }
  .feature-card-art {
    order: -1;
    min-height: 180px;
  }
}

/* ---------- Stats column (top-of-page, like Products header) ---------- */
.stats-col {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding-top: 6px;
}

.stat-block .num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 3vw, 2.2rem);
  display: block;
  line-height: 1.1;
}

.stat-block .label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ---------- Section rhythm ---------- */
section {
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

h2.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  margin: 0;
  letter-spacing: -0.01em;
}

/* ---------- Release list ---------- */
.release-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.release-row {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 20px 22px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  background: transparent;
  transition: background 0.15s ease;
  border-radius: var(--radius-sm);
}

.release-row:hover {
  background: var(--paper-warm);
}

.release-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.release-main strong {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  display: block;
  margin-bottom: 3px;
}

.release-main span {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.release-arrow {
  color: var(--ink-soft);
  font-size: 1.1rem;
}

@media (max-width: 600px) {
  .release-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

/* ---------- Product / research feature list ---------- */
.pillar-list {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.pillar {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--panel-line);
}

.pillar:first-child {
  border-top: none;
}

.pillar .pillar-num {
  font-family: var(--font-mono);
  color: var(--panel-text-soft);
  font-size: 0.85rem;
  padding-top: 3px;
}

.pillar h4 {
  font-family: var(--font-display);
  margin: 0 0 6px;
  font-size: 1.02rem;
}

.pillar p {
  margin: 0;
  color: var(--panel-text-soft);
  font-size: 0.94rem;
}

/* ---------- Simple two-col text block ---------- */
.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 64px);
}

@media (max-width: 760px) {
  .two-col,
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

.prose p {
  color: var(--ink-soft);
  font-size: 1.02rem;
  max-width: 60ch;
}

.prose p + p {
  margin-top: 14px;
}

/* ---------- Status pill ---------- */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--panel-line);
  color: var(--panel-text-soft);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #e8b23d;
  box-shadow: 0 0 0 3px rgba(232, 178, 61, 0.18);
}

.status-dot.live {
  background: #4caf6d;
  box-shadow: 0 0 0 3px rgba(76, 175, 109, 0.18);
}

/* ---------- License / meta chips ---------- */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.chip {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
}

/* ---------- Footer ---------- */
footer.site-footer {
  border-top: 1px solid var(--line);
  padding-top: 40px;
  padding-bottom: 40px;
  margin-top: 40px;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-links {
  display: flex;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.footer-links a {
  text-decoration: none;
  color: inherit;
}
.footer-links a:hover {
  color: var(--ink);
}

.footer-note {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

/* ---------- Utility ---------- */
.mt-lg {
  margin-top: clamp(28px, 5vw, 48px);
}

.text-center {
  text-align: center;
}

.max-prose {
  max-width: 68ch;
}

.divider {
  height: 1px;
  background: var(--line);
  border: none;
  margin: 0;
}

/* Focus visibility for keyboard users */
a:focus-visible,
button:focus-visible {
  outline: 2px solid #2f6bff;
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Mobile nav ---------- */
@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    inset: 64px 0 0 0;
    background: var(--paper);
    flex-direction: column;
    align-items: flex-start;
    padding: 28px var(--pad);
    gap: 22px;
    font-size: 1.1rem;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease;
    border-bottom: 1px solid var(--line);
  }

  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: var(--paper);
  }

  .nav-toggle span,
  .nav-toggle span::before,
  .nav-toggle span::after {
    content: "";
    display: block;
    width: 18px;
    height: 2px;
    background: var(--ink);
    position: relative;
    transition: transform 0.15s ease;
  }
  .nav-toggle span::before {
    position: absolute;
    top: -6px;
  }
  .nav-toggle span::after {
    position: absolute;
    top: 6px;
  }
}