:root {
  --brand-ink: #131F2A;
  --brand-paper: #F6F5F3;
  --brand-navy: #122F42;
  --brand-slate: #275668;
  --brand-accent: #CF733A;
  --brand-accent-hover: #BB6733;
  --brand-accent-active: #A75D2E;

  --color-surface-canvas: var(--brand-paper);
  --color-surface-primary: #FFFFFF;
  --color-surface-secondary: #EEF2F4;
  --color-surface-dark: var(--brand-ink);
  --color-surface-dark-alt: var(--brand-navy);
  --color-surface-muted: rgba(39, 86, 104, 0.08);

  --color-text-primary: var(--brand-ink);
  --color-text-secondary: #44515B;
  --color-text-muted: #5C6770;
  --color-text-inverse: #FFFFFF;
  --color-text-inverse-muted: rgba(255,255,255,0.78);
  --color-text-inverse-faint: rgba(255,255,255,0.55);

  --color-border-default: rgba(19,31,42,0.10);
  --color-border-strong: rgba(19,31,42,0.18);
  --color-border-inverse: rgba(255,255,255,0.10);
  --color-divider: rgba(19,31,42,0.08);
  --color-muted-border: rgba(39,86,104,0.12);

  --color-cta-bg: var(--brand-accent);
  --color-cta-bg-hover: var(--brand-accent-hover);
  --color-cta-bg-active: var(--brand-accent-active);
  --color-cta-text: #FFFFFF;

  --color-focus-ring: rgba(207,115,58,0.35);

  --space-0: 0;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 40px;
  --space-8: 48px;
  --space-9: 64px;
  --space-10: 80px;
  --space-11: 96px;

  --radius-xs: 10px;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-2xl: 28px;
  --radius-pill: 999px;

  --shadow-sm: 0 8px 20px rgba(19,31,42,0.04);
  --shadow-md: 0 14px 36px rgba(19,31,42,0.08);
  --shadow-lg: 0 18px 44px rgba(19,31,42,0.12);

  --font-sans: 'IBM Plex Sans', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: 'Newsreader', ui-serif, Georgia, serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  --container-max: 1200px;
  --container-gutter-desktop: 40px;
  --container-gutter-tablet: 24px;
  --container-gutter-mobile: 16px;

  --duration-fast: 120ms;
  --duration-base: 180ms;
  --duration-slow: 260ms;
  --easing-standard: ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background: var(--color-surface-canvas);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
main { flex: 1 0 auto; }
a { color: inherit; text-decoration: none; }
img { display: block; }

.container {
  width: min(var(--container-max), calc(100% - 2 * var(--container-gutter-desktop)));
  margin: 0 auto;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--color-text-primary);
}
h1.display {
  font-size: clamp(2.625rem, 6vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  font-optical-sizing: auto;
  text-wrap: balance;
}
h2.section-title {
  font-size: clamp(1.75rem, 3.2vw, 2.375rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.lead {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
  max-width: 60ch;
  text-wrap: pretty;
}
.body {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.55;
  text-wrap: pretty;
}
.mono { font-family: var(--font-mono); }

/* ---------- Eyebrow / chip ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-slate);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}
.eyebrow-inverse { color: var(--color-text-inverse-faint); }

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: 6px;
}
.chip {
  display: inline-flex;
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-muted);
  border: 1px solid var(--color-muted-border);
  color: var(--brand-slate);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

/* ---------- Buttons ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 46px;
  padding: 0 18px;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9375rem;
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition:
    background var(--duration-base) var(--easing-standard),
    border-color var(--duration-base) var(--easing-standard),
    color var(--duration-base) var(--easing-standard),
    transform var(--duration-fast) var(--easing-standard),
    box-shadow var(--duration-base) var(--easing-standard);
}
.button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px var(--color-focus-ring);
}
.button-sm { min-height: 42px; padding: 0 16px; font-size: 0.875rem; }
.button-primary { background: var(--color-cta-bg); color: var(--color-cta-text); }
.button-primary:hover { background: var(--color-cta-bg-hover); transform: translateY(-1px); }
.button-primary:active { background: var(--color-cta-bg-active); transform: translateY(0); }
.button-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border-default);
}
.button-secondary:hover {
  border-color: var(--color-border-strong);
  background: rgba(19,31,42,0.03);
}
.button-secondary:active { background: rgba(19,31,42,0.06); }
.button .arrow {
  display: inline-block;
  transition: transform var(--duration-base) var(--easing-standard);
}
.button:hover .arrow { transform: translateX(3px); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(10px);
  background: rgba(246,245,243,0.92);
  border-bottom: 1px solid var(--color-divider);
}
.site-header .inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.005em;
  color: var(--color-text-primary);
}
.brand-inverse { color: var(--color-text-inverse); }
.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  flex-shrink: 0;
}
.brand-logo-sm { width: 32px; height: 32px; }
.top-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}
.top-nav .nav-links {
  display: flex;
  gap: 28px;
}
.top-nav a { transition: color var(--duration-base) var(--easing-standard); }
.top-nav a:hover { color: var(--color-text-primary); }
@media (max-width: 880px) {
  .top-nav .nav-links { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 72px;
  border-bottom: 1px solid var(--color-divider);
  background:
    radial-gradient(circle at 92% 8%, rgba(39,86,104,0.10), transparent 36%),
    var(--color-surface-canvas);
}
.hero .container { display: grid; gap: 56px; }
.hero-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  max-width: 920px;
}
.hero-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-2);
}
.hero-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--color-divider);
  padding-top: 28px;
}
.hero-meta-item {
  padding-right: var(--space-5);
  border-right: 1px solid var(--color-divider);
}
.hero-meta-item:last-child { border-right: 0; padding-right: 0; }
.hero-meta-item .k {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-slate);
  margin-bottom: var(--space-2);
}
.hero-meta-item .v {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--color-text-primary);
  font-weight: 500;
  letter-spacing: -0.01em;
}
.hero-meta-item .v.serif {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}
@media (max-width: 820px) {
  .hero { padding: 64px 0 56px; }
  .hero-meta { grid-template-columns: repeat(2, 1fr); row-gap: var(--space-5); }
  .hero-meta-item:nth-child(2) { border-right: 0; }
}
@media (max-width: 480px) {
  .hero-meta { grid-template-columns: 1fr; }
  .hero-meta-item { border-right: 0; padding-right: 0; }
}

/* ---------- Section scaffold ---------- */
section.block {
  padding: 96px 0;
  border-bottom: 1px solid var(--color-divider);
}
section.block.block-tight { padding: 72px 0; }
section.block:last-of-type { border-bottom: none; }

.section-head {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: end;
  margin-bottom: 48px;
}
.section-head.section-head-tight { margin-bottom: 32px; }
.section-head-left { display: grid; gap: var(--space-4); }
.section-head-right .body { max-width: 44ch; }
@media (max-width: 900px) {
  .section-head {
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: start;
  }
  section.block { padding: 72px 0; }
}

/* ---------- Practice (pillars) ---------- */
.practice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.pillar {
  background: var(--color-surface-primary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 28px;
  display: grid;
  gap: 14px;
  align-content: start;
  transition:
    border-color var(--duration-base) var(--easing-standard),
    box-shadow var(--duration-base) var(--easing-standard),
    transform var(--duration-base) var(--easing-standard);
}
.pillar:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.pillar .num {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-pill);
  display: grid;
  place-items: center;
  background: var(--color-surface-muted);
  color: var(--brand-slate);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: -0.02em;
}
.pillar h3 {
  font-size: 1.5rem;
  line-height: 1.15;
  letter-spacing: -0.015em;
  font-weight: 600;
}
@media (max-width: 900px) {
  .practice-grid { grid-template-columns: 1fr; }
}

/* ---------- Build block (dark) ---------- */
.build-block {
  background: var(--color-surface-dark);
  color: var(--color-text-inverse);
  border-radius: var(--radius-2xl);
  padding: var(--space-9);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border-inverse);
}
.build-block .eyebrow { margin-bottom: var(--space-3); }
.build-block h2 { color: var(--color-text-inverse); margin-top: 12px; }
.build-block .lead { color: var(--color-text-inverse-muted); max-width: 60ch; margin-top: var(--space-4); }
.build-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-top: 40px;
}
.build-item {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 18px;
  align-items: start;
}
.build-item .ix {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  display: grid;
  place-items: center;
  background: var(--brand-slate);
  color: var(--color-text-inverse);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.8125rem;
}
.build-item h4 {
  color: var(--color-text-inverse);
  font-weight: 600;
  font-size: 1.1875rem;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin-bottom: var(--space-2);
}
.build-item p {
  color: var(--color-text-inverse-muted);
  font-size: 0.9375rem;
  line-height: 1.55;
}
@media (max-width: 900px) {
  .build-block { padding: 40px 28px; border-radius: var(--radius-md); }
  .build-grid { grid-template-columns: 1fr; }
}

/* ---------- Open source repos ---------- */
.os-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-5);
}
.repo {
  background: var(--color-surface-primary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5);
  display: grid;
  gap: 14px;
  align-content: start;
  transition:
    border-color var(--duration-base) var(--easing-standard),
    box-shadow var(--duration-base) var(--easing-standard);
}
.repo:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
}
.repo .repo-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.repo .repo-name {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}
.repo .repo-status {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 9px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-muted);
  color: var(--brand-slate);
}
.repo .repo-tagline {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.25rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  text-wrap: balance;
}
.repo .repo-foot {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
}
.repo .lang-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  display: inline-block;
}
.repo .repo-links {
  display: grid;
  gap: 6px;
  padding: 12px 14px;
  background: var(--color-surface-muted);
  border: 1px solid var(--color-muted-border);
  border-radius: var(--radius-md);
}
.repo .repo-links a {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 4px 0;
  color: var(--color-text-primary);
  transition: color var(--duration-base) var(--easing-standard);
}
.repo .repo-links a:hover { color: var(--brand-accent); }
.repo .repo-links a:hover .mono { color: var(--brand-accent); }
.repo .repo-links .mono {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--brand-slate);
  letter-spacing: -0.01em;
  transition: color var(--duration-base) var(--easing-standard);
}
.repo .repo-links .desc {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}
@media (max-width: 980px) {
  .os-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 700px) {
  .os-grid { grid-template-columns: 1fr; }
}
.os-foot {
  margin-top: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  padding-top: 28px;
  border-top: 1px solid var(--color-divider);
}
.os-foot .note-text {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  max-width: 60ch;
}

/* ---------- Commercial ---------- */
.commercial { background: var(--color-surface-canvas); }
.commercial-card {
  background: var(--color-surface-primary);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}
.commercial-card h3 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 2.5vw, 1.875rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.commercial-card .body { max-width: 56ch; }
.commercial-card-right { display: grid; gap: var(--space-3); }
.product-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: var(--color-surface-muted);
}
.product-row .tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--brand-slate);
  letter-spacing: 0.04em;
}
.product-row .name {
  font-weight: 700;
  color: var(--color-text-primary);
  font-size: 0.9375rem;
}
.product-row .desc {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}
.product-row .status-chip {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 9px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-primary);
  border: 1px solid var(--color-border-default);
  color: var(--color-text-muted);
}
@media (max-width: 900px) {
  .commercial-card { grid-template-columns: 1fr; padding: 28px; }
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-4);
}
.contact-card {
  background: var(--color-surface-primary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 28px;
  display: grid;
  gap: var(--space-2);
  align-content: start;
  transition:
    border-color var(--duration-base) var(--easing-standard),
    box-shadow var(--duration-base) var(--easing-standard),
    transform var(--duration-base) var(--easing-standard);
}
.contact-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.contact-card .k {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-slate);
  margin-bottom: var(--space-2);
}
.contact-card .v {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-text-primary);
  font-weight: 500;
  word-break: break-word;
}
.contact-card .body { margin-top: 6px; }
.contact-arrow {
  align-self: end;
  justify-self: end;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  display: grid;
  place-items: center;
  background: var(--color-surface-muted);
  color: var(--brand-slate);
  margin-top: var(--space-3);
  transition:
    background var(--duration-base) var(--easing-standard),
    color var(--duration-base) var(--easing-standard),
    transform var(--duration-base) var(--easing-standard);
}
.contact-card:hover .contact-arrow {
  background: var(--brand-accent);
  color: var(--color-text-inverse);
  transform: translate(2px, -2px);
}
@media (max-width: 820px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ---------- Footer ---------- */
.site-footer {
  padding: 64px 0 48px;
  background: var(--color-surface-dark);
  color: var(--color-text-inverse);
}
.site-footer .footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border-inverse);
}
.site-footer .brand-block {
  display: grid;
  gap: 14px;
  align-content: start;
}
.site-footer .brand-block p {
  color: var(--color-text-inverse-muted);
  font-size: 0.9375rem;
  line-height: 1.55;
  max-width: 36ch;
}
.site-footer .footer-col h5 {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-inverse-faint);
  margin-bottom: 18px;
}
.site-footer .footer-col a {
  display: block;
  color: var(--color-text-inverse-muted);
  font-size: 0.9375rem;
  padding: 4px 0;
  transition: color var(--duration-base) var(--easing-standard);
}
.site-footer .footer-col a:hover { color: var(--color-text-inverse); }
.site-footer .footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: 32px;
  color: var(--color-text-inverse-faint);
  font-size: 0.8125rem;
  flex-wrap: wrap;
}
.site-footer .footer-bottom .mono { letter-spacing: 0.02em; }
@media (max-width: 900px) {
  .site-footer .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 540px) {
  .site-footer .footer-top { grid-template-columns: 1fr; }
}

/* ---------- Responsive container ---------- */
@media (max-width: 1100px) {
  .container {
    width: min(var(--container-max), calc(100% - 2 * var(--container-gutter-tablet)));
  }
}
@media (max-width: 760px) {
  .container {
    width: min(var(--container-max), calc(100% - 2 * var(--container-gutter-mobile)));
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}