:root {
  --emerald-50:  #ecfdf5;
  --emerald-100: #d1fae5;
  --emerald-200: #a7f3d0;
  --emerald-400: #34d399;
  --emerald-500: #10b981;
  --emerald-600: #059669;
  --emerald-700: #047857;
  --emerald-800: #065f46;
  --emerald-900: #064e3b;

  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --slate-950: #020617;

  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  color: var(--slate-800);
  background: var(--slate-50);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--emerald-700); text-decoration: none; }
a:hover { color: var(--emerald-800); text-decoration: underline; }

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 0.08em 0.32em;
  background: var(--slate-100);
  color: var(--slate-800);
  border-radius: 4px;
}

.code { font-family: var(--font-mono); }

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(15, 23, 42, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--slate-800);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.brand {
  display: flex; align-items: center; gap: 0.75rem;
  color: #fff;
  text-decoration: none;
}
.brand-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--emerald-500);
  color: var(--slate-900);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 22px;
  font-weight: 800;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: 0.95rem; color: #fff; }
.brand-text small {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--slate-400);
  font-family: var(--font-mono);
  margin-top: 2px;
}

.nav-links { display: flex; align-items: center; gap: 1.25rem; }
.nav-links a {
  color: var(--slate-300);
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-links a:hover { color: var(--emerald-400); text-decoration: none; }
.nav-links .cta {
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  background: var(--emerald-500);
  color: var(--slate-900) !important;
  font-weight: 600;
}
.nav-links .cta:hover { background: var(--emerald-400); }

@media (max-width: 720px) {
  .nav-links a:not(.cta) { display: none; }
}

.hero {
  background: radial-gradient(ellipse at top, var(--slate-900) 0%, var(--slate-950) 60%);
  color: var(--slate-100);
  padding: 5rem 1.25rem 5rem;
  text-align: center;
}
.hero-inner {
  max-width: 920px;
  margin: 0 auto;
}
.pill {
  display: inline-block;
  padding: 0.3rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--emerald-500);
  background: rgba(16, 185, 129, 0.1);
  color: var(--emerald-400);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: var(--font-mono);
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: #fff;
  margin: 0 0 1.5rem;
}
.hero h1 em {
  color: var(--emerald-400);
  font-style: italic;
  font-weight: 400;
}
.lede {
  font-size: 1.1rem;
  color: var(--slate-300);
  max-width: 760px;
  margin: 0 auto 2rem;
  line-height: 1.65;
}
.hero-cta {
  display: flex; gap: 0.75rem; justify-content: center;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 0.85rem 1.6rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 80ms ease, background 120ms ease, color 120ms ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: var(--emerald-500);
  color: var(--slate-900);
}
.btn-primary:hover { background: var(--emerald-400); color: var(--slate-900); }
.btn-secondary {
  background: transparent;
  color: var(--slate-100);
  border-color: var(--slate-600);
}
.btn-secondary:hover { background: var(--slate-800); color: #fff; }

.stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--slate-800);
  max-width: 700px;
  margin: 0 auto;
}
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.stat-num {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--emerald-400);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate-500);
  font-family: var(--font-mono);
  margin-top: 0.5rem;
}

.block { padding: 4rem 1.25rem; }
.block-tinted { background: var(--slate-100); }
.block-dark {
  background: var(--slate-900);
  color: var(--slate-100);
}
.block-dark h2 { color: #fff; }
.block-dark .prose { color: var(--slate-300); }
.block-dark .card { background: var(--slate-800); border-color: var(--slate-700); color: var(--slate-100); }
.block-dark code { background: var(--slate-800); color: var(--slate-200); }

.block-inner { max-width: 1200px; margin: 0 auto; }
.block-narrow { max-width: 800px; }

h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 0 0 1.5rem;
  color: var(--slate-900);
}

.prose {
  font-size: 1rem;
  color: var(--slate-600);
  max-width: 760px;
  line-height: 1.7;
}
.prose + .prose { margin-top: 1rem; }

.layers {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}
.layer {
  border: 1px solid var(--slate-200);
  border-radius: 16px;
  padding: 1.5rem;
  background: #fff;
}
.layer-label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate-500);
  font-family: var(--font-mono);
  font-weight: 700;
  margin-bottom: 1rem;
}
.layer-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}
.layer-card {
  display: block;
  padding: 1rem 1.25rem;
  border-radius: 12px;
  text-decoration: none;
  border: 1px solid var(--slate-200);
  background: var(--slate-50);
  transition: transform 100ms ease, border-color 100ms ease, box-shadow 100ms ease;
}
.layer-card:hover {
  transform: translateY(-2px);
  text-decoration: none;
  box-shadow: 0 6px 14px -8px rgba(0, 0, 0, 0.15);
}
.layer-card h4 {
  margin: 0 0 0.3rem;
  font-size: 0.95rem;
  color: var(--slate-900);
}
.layer-card p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--slate-600);
  line-height: 1.45;
}
.layer-card p em { color: var(--slate-500); font-style: italic; }
.layer-card--blue    { border-color: #93c5fd; }
.layer-card--blue:hover    { border-color: #3b82f6; }
.layer-card--emerald { border-color: #6ee7b7; }
.layer-card--emerald:hover { border-color: #10b981; }
.layer-card--violet  { border-color: #c4b5fd; }
.layer-card--violet:hover  { border-color: #8b5cf6; }
.layer-card--amber   { border-color: #fcd34d; }
.layer-card--amber:hover   { border-color: #f59e0b; }
.layer-card--rose    { border-color: #fda4af; }
.layer-card--rose:hover    { border-color: #f43f5e; }
.layer-card--teal    { border-color: #5eead4; }
.layer-card--teal:hover    { border-color: #14b8a6; }
.layer-card--fuchsia { border-color: #f0abfc; }
.layer-card--fuchsia:hover { border-color: #d946ef; }
.layer-card--indigo  { border-color: #a5b4fc; }
.layer-card--indigo:hover  { border-color: #6366f1; }
.layer-card--cyan    { border-color: #67e8f9; }
.layer-card--cyan:hover    { border-color: #06b6d4; }
.layer-card--red     { border-color: #fca5a5; }
.layer-card--red:hover     { border-color: #ef4444; }

.layer-arrow {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate-500);
}
.layer-note {
  margin-top: 0.85rem;
  font-size: 0.85rem;
  color: var(--slate-600);
  padding: 0.6rem 0.9rem;
  background: var(--slate-50);
  border-left: 2px solid var(--emerald-500);
  border-radius: 4px;
}

.spec-table {
  overflow-x: auto;
  margin-top: 2rem;
  border-radius: 14px;
  border: 1px solid var(--slate-200);
  background: #fff;
}
.spec-table table { width: 100%; border-collapse: collapse; }
.spec-table th,
.spec-table td {
  text-align: left;
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--slate-200);
}
.spec-table th {
  background: var(--slate-50);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--slate-600);
  font-weight: 700;
}
.spec-table tbody tr:last-child td { border-bottom: none; }
.spec-table tbody tr:hover { background: var(--slate-50); }
.tag {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}
.tag-edu    { background: #ccfbf1; color: #115e59; }
.tag-health { background: #cffafe; color: #155e75; }
.tag-x      { background: #fee2e2; color: #991b1b; }

.grid { display: grid; gap: 1rem; margin-top: 2rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 800px) { .grid-2 { grid-template-columns: 1fr; } }

.card-feature {
  display: block;
  background: #fff;
  border: 1px solid var(--slate-200);
  border-radius: 16px;
  padding: 2rem;
  text-decoration: none;
  color: var(--slate-800);
  transition: transform 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}
.card-feature:hover {
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--slate-800);
  box-shadow: 0 8px 20px -10px rgba(0, 0, 0, 0.15);
}
.card-feature--blue:hover    { border-color: #3b82f6; }
.card-feature--emerald:hover { border-color: var(--emerald-500); }
.card-feature h3 {
  font-size: 1.3rem;
  margin: 0 0 0.6rem;
  color: var(--slate-900);
  font-family: var(--font-mono);
}
.card-feature p {
  font-size: 0.95rem;
  color: var(--slate-600);
  margin: 0 0 1rem;
  line-height: 1.6;
}
.card-feature-eyebrow {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--emerald-600);
  font-family: var(--font-mono);
  font-weight: 700;
  margin-bottom: 0.6rem;
}
.card-feature-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  font-size: 0.85rem;
  color: var(--slate-700);
}
.card-feature-list li {
  padding: 0.2rem 0 0.2rem 1.2rem;
  position: relative;
}
.card-feature-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--emerald-500);
  font-weight: 700;
}
.card-feature-link {
  display: inline-block;
  margin-top: 0.5rem;
  color: var(--emerald-700);
  font-size: 0.9rem;
  font-weight: 600;
}

.card {
  background: #fff;
  border: 1px solid var(--slate-200);
  border-radius: 14px;
  padding: 1.5rem;
  transition: transform 120ms ease, border-color 120ms ease;
}
.card h3 { font-size: 1.05rem; margin: 0 0 0.6rem; color: var(--slate-900); font-weight: 600; }
.card p { font-size: 0.9rem; color: var(--slate-600); margin: 0; }
.card-dark {
  text-decoration: none;
  color: var(--slate-100);
  cursor: pointer;
}
.card-dark:hover {
  border-color: var(--emerald-500);
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--slate-100);
}
.card-dark h3 { color: #fff; }
.card-dark p { color: var(--slate-400); }
.card-eyebrow {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--emerald-400);
  font-family: var(--font-mono);
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.link {
  display: inline-block;
  margin-top: 1rem;
  color: var(--emerald-400);
  font-size: 0.85rem;
  font-weight: 500;
}

.footer {
  border-top: 1px solid var(--slate-200);
  background: #fff;
  padding: 2rem 1.25rem;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--slate-500);
}
.footer-inner small { font-size: 0.8rem; }
.footer-inner a { color: var(--slate-600); }
.footer-inner a:hover { color: var(--slate-900); }