:root {
  --color-paper-white: #fafafa;
  --color-pure-white: #ffffff;
  --color-hairline: #ebebeb;
  --color-ash: #c9c9c9;
  --color-smoke: #a8a8a8;
  --color-graphite: #8f8f8f;
  --color-slate: #7d7d7d;
  --color-stone: #666666;
  --color-charcoal: #4d4d4d;
  --color-obsidian: #171717;
  --color-carbon: #000000;
  --color-terminal-green: #297a3a;

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

  --radius-sm: 2px;
  --radius-md: 6px;
  --radius-full: 9999px;

  --shadow-subtle: 0 0 0 1px rgba(0, 0, 0, 0.08), 0 0 0 2px #fafafa;
  --shadow-subtle-2: 0 0 0 1px #ebebeb;

  --page-max-width: 1280px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-paper-white);
  color: var(--color-obsidian);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.wrap {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 768px) {
  .wrap { padding: 0 48px; }
}

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 64px;
  display: flex;
  align-items: center;
  background: rgba(250, 250, 250, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-obsidian);
}

.brand .mark {
  width: 16px;
  height: 16px;
  color: var(--color-carbon);
}

.nav-links {
  display: none;
  align-items: center;
  gap: 24px;
  font-size: 14px;
  color: var(--color-obsidian);
}

@media (min-width: 900px) {
  .nav-links { display: flex; }
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  white-space: nowrap;
}

.btn-filled {
  background: var(--color-obsidian);
  color: var(--color-pure-white);
  padding: 12px 20px;
}

.btn-ghost {
  background: transparent;
  color: var(--color-charcoal);
  box-shadow: var(--shadow-subtle-2);
  padding: 12px 20px;
}

.btn-pill {
  border-radius: var(--radius-full);
  padding: 8px 16px;
  font-size: 13px;
}

/* ---------- Eyebrow ---------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.071em;
  text-transform: uppercase;
  color: var(--color-obsidian);
  margin-bottom: 12px;
}

/* ---------- Hero ---------- */

.hero {
  padding: 96px 0 64px;
}

.hero-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.4fr 0.6fr;
  }
}

.hero h1 {
  font-size: 40px;
  font-weight: 450;
  line-height: 1.05;
  letter-spacing: -1.5px;
  margin: 0 0 20px;
  color: var(--color-obsidian);
}

@media (min-width: 640px) {
  .hero h1 { font-size: 56px; letter-spacing: -3.36px; }
}

.hero p.lede {
  font-size: 16px;
  color: var(--color-charcoal);
  max-width: 46ch;
  margin: 0 0 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-mark {
  display: flex;
  justify-content: center;
  color: var(--color-carbon);
}

.hero-mark svg {
  width: 140px;
  height: 140px;
}

/* ---------- Sections ---------- */

section {
  padding: 96px 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: 48px;
}

.section-head h2 {
  font-size: 30px;
  font-weight: 400;
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin: 0 0 12px;
  color: var(--color-obsidian);
}

.section-head p {
  font-size: 16px;
  color: var(--color-charcoal);
  margin: 0;
}

/* ---------- Cards ---------- */

.card {
  background: var(--color-pure-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-subtle);
  padding: 24px;
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

@media (min-width: 700px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.activity-index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-smoke);
  margin-bottom: 8px;
}

.card h3 {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-obsidian);
  margin: 0 0 8px;
  letter-spacing: -0.2px;
}

.card p {
  font-size: 14px;
  color: var(--color-charcoal);
  margin: 0;
  line-height: 1.5;
}

/* ---------- License / About ---------- */

.about-grid {
  display: grid;
  gap: 40px;
}

@media (min-width: 900px) {
  .about-grid { grid-template-columns: 1fr 1fr; }
}

.about-copy p {
  color: var(--color-charcoal);
  font-size: 16px;
  margin: 0 0 16px;
}

.license-card {
  font-family: var(--font-mono);
  font-size: 13px;
}

.license-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-hairline);
}

.license-row:last-child {
  border-bottom: none;
}

.license-row dt {
  color: var(--color-stone);
}

.license-row dd {
  margin: 0;
  color: var(--color-obsidian);
  text-align: right;
}

.license-row dl {
  display: contents;
}

.status-line {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-terminal-green);
}

/* ---------- Contact ---------- */

.contact-card {
  display: grid;
  gap: 24px;
}

@media (min-width: 700px) {
  .contact-card { grid-template-columns: 1fr 1fr; }
}

.contact-field {
  font-size: 14px;
}

.contact-field .label {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.071em;
  color: var(--color-stone);
  margin-bottom: 6px;
  display: block;
}

.contact-field .value {
  color: var(--color-obsidian);
  font-size: 15px;
}

/* ---------- Footer ---------- */

footer {
  border-top: 1px solid var(--color-hairline);
  padding: 40px 0;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-graphite);
}