/* Adil Edge — research website. Plain CSS, no build step, no framework. */

:root {
  --charcoal: #102124;
  --turquoise: #20b29e;
  --grey: #68747a;
  --white: #ffffff;
  --border: #e4e8e9;
  --surface: #f6f8f8;
  --max-width: 760px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--white);
  color: var(--charcoal);
  font-family: var(--font);
  line-height: 1.6;
  font-size: 17px;
}

a {
  color: var(--charcoal);
  text-decoration-color: var(--turquoise);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

a:hover,
a:focus-visible {
  color: var(--turquoise);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--turquoise);
  outline-offset: 2px;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--charcoal);
  color: var(--white);
  padding: 0.75rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */

.site-header {
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  row-gap: 0.5rem;
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
  max-width: 880px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--charcoal);
}

.brand img {
  width: 32px;
  height: 32px;
}

.brand-name {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.site-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

.site-nav a {
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--grey);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--charcoal);
}

/* Hero */

.hero {
  padding: 3.5rem 0 2.5rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--turquoise);
  margin: 0 0 0.75rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 1rem;
}

.hero .lede {
  font-size: 1.15rem;
  color: var(--grey);
  max-width: 42ch;
  margin: 0 0 1.5rem;
}

.status-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.pill {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--charcoal);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.65rem 1.1rem;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
}

.btn-primary {
  background: var(--charcoal);
  color: var(--white);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--turquoise);
  color: var(--charcoal);
}

.btn-secondary {
  background: transparent;
  color: var(--charcoal);
  border: 1px solid var(--border);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--turquoise);
  color: var(--charcoal);
}

/* Sections */

section {
  padding: 2.75rem 0;
  border-top: 1px solid var(--border);
}

section h2 {
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
}

section > .wrap > p:first-of-type {
  margin-top: 0;
}

.section-intro {
  color: var(--grey);
  max-width: 56ch;
}

/* Approach grid */

.approach-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.approach-item h3 {
  font-size: 1.02rem;
  margin: 0 0 0.4rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.approach-item .num {
  color: var(--turquoise);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.approach-item p {
  margin: 0;
  color: var(--grey);
  font-size: 0.97rem;
}

/* Milestones */

.milestones {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.milestone {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.milestone-status {
  flex-shrink: 0;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  white-space: nowrap;
  margin-top: 0.15rem;
}

.milestone-status.complete {
  background: rgba(32, 178, 158, 0.14);
  color: #126f62;
}

.milestone-status.proposed {
  background: var(--surface);
  color: var(--grey);
  border: 1px solid var(--border);
}

.milestone h3 {
  font-size: 0.98rem;
  margin: 0 0 0.25rem;
}

.milestone p {
  margin: 0;
  color: var(--grey);
  font-size: 0.95rem;
}

/* Applications list */

.applications-list {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem 1.5rem;
}

.applications-list li {
  padding-left: 1.1rem;
  position: relative;
  color: var(--charcoal);
}

.applications-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--turquoise);
}

.applications-note {
  margin-top: 1.25rem;
  color: var(--grey);
  font-size: 0.92rem;
}

/* Collaboration */

.collab-cta {
  background: var(--surface);
  border-radius: 10px;
  padding: 2rem;
  text-align: left;
}

.collab-cta h2 {
  margin-top: 0;
}

.collab-list {
  margin: 1rem 0 1.5rem;
  padding-left: 1.1rem;
  color: var(--grey);
}

.collab-list li {
  margin-bottom: 0.35rem;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  color: var(--grey);
  font-size: 0.88rem;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  color: var(--charcoal);
  font-weight: 700;
}

.footer-brand img {
  width: 22px;
  height: 22px;
}

.footer-company address {
  font-style: normal;
  line-height: 1.5;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links li {
  margin-bottom: 0.4rem;
}

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

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--charcoal);
}

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
}

/* Simple content pages (privacy / legal) */

.page-content h1 {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

.page-content .updated {
  color: var(--grey);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.page-content h2 {
  font-size: 1.2rem;
  margin-top: 2rem;
}

.page-content p,
.page-content li {
  color: var(--charcoal);
}

.page-content ul {
  padding-left: 1.2rem;
}

/* Responsive */

/* Editions / products */

.edition-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.edition-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
}

.edition-card h2,
.edition-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
}

.edition-card .status-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--grey);
  margin-bottom: 0.75rem;
}

.edition-card ul {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
  color: var(--charcoal);
}

.edition-card ul li {
  margin-bottom: 0.3rem;
}

.edition-note {
  margin: 0.9rem 0 0;
  color: var(--grey);
  font-size: 0.9rem;
  font-style: italic;
}

/* Ecosystem product rows */

.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.ecosystem-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.1rem;
}

.ecosystem-card h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.ecosystem-card p {
  margin: 0 0 0.5rem;
  color: var(--grey);
  font-size: 0.92rem;
}

.ecosystem-card a {
  font-size: 0.88rem;
  font-weight: 600;
}

.ecosystem-note {
  margin-top: 1.25rem;
  color: var(--grey);
  font-size: 0.88rem;
  font-style: italic;
}

/* Design principles (developers page) */

.principle-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.principle-grid h3 {
  font-size: 1rem;
  margin: 0 0 0.4rem;
}

.principle-grid p {
  margin: 0;
  color: var(--grey);
  font-size: 0.95rem;
}

.notice-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-weight: 600;
}

.site-nav a[aria-current="page"] {
  color: var(--charcoal);
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .site-header .wrap {
    padding-top: 1rem;
    padding-bottom: 1rem;
  }

  .site-nav {
    width: 100%;
  }

  .site-nav ul {
    gap: 0.5rem 1rem;
  }

  .site-nav a {
    font-size: 0.88rem;
  }

  .hero {
    padding: 2.25rem 0 1.75rem;
  }

  .approach-grid,
  .applications-list,
  .ecosystem-grid,
  .principle-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    flex-direction: column;
    gap: 1.75rem;
  }

  .collab-cta {
    padding: 1.5rem;
  }
}