/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body, h1, h2, h3, h4, p, ul, ol, li, figure { margin: 0; padding: 0; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

/* ---------- Design tokens ---------- */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f4f7f6;
  --color-text: #1a2422;
  --color-text-muted: #52605d;
  --color-border: #e1e8e6;
  --color-primary: #0f5e5c;
  --color-primary-dark: #0b4644;
  --color-primary-contrast: #ffffff;
  --color-accent: #c8895a;
  --radius: 10px;
  --shadow: 0 4px 16px rgba(15, 94, 92, 0.08);
  --max-width: 960px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1715;
    --color-bg-alt: #14201d;
    --color-text: #eaf2f0;
    --color-text-muted: #a9bab5;
    --color-border: #23332f;
    --color-primary: #4fb3a9;
    --color-primary-dark: #3c8f87;
    --color-primary-contrast: #08120f;
    --color-accent: #e0a06c;
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
  }
}

/* ---------- Base ---------- */
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  transition: top 0.2s ease;
  z-index: 100;
}
.skip-link:focus { top: 1rem; }

a:focus-visible, button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: saturate(180%) blur(6px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.85rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.05rem;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.primary-nav ul {
  display: flex;
  gap: 1.75rem;
}

.primary-nav a {
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.15s ease;
}
.primary-nav a:hover { color: var(--color-primary); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 0.5rem;
}

.nav-toggle-bar {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .primary-nav.is-open { max-height: 320px; }

  .primary-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.25rem 1rem;
  }
  .primary-nav li { border-top: 1px solid var(--color-border); }
  .primary-nav a { display: block; padding: 0.85rem 0; }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
}

/* ---------- Hero ---------- */
.hero {
  padding-block: 5rem 4rem;
  background: linear-gradient(180deg, var(--color-bg-alt), var(--color-bg));
}

.eyebrow {
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero-role {
  margin-top: 0.6rem;
  font-size: 1.15rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.hero-tagline {
  margin-top: 1rem;
  max-width: 42ch;
  color: var(--color-text-muted);
}

.hero-actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  box-shadow: var(--shadow);
}
.btn-primary:hover { background: var(--color-primary-dark); }

.btn-outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
}
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ---------- Sections ---------- */
.section { padding-block: 4rem; }
.section, .hero { scroll-margin-top: 4.5rem; }
.section-alt { background: var(--color-bg-alt); }

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 2rem;
}

.about-content { max-width: 68ch; }
.about-content p { color: var(--color-text-muted); margin-bottom: 1rem; }
.about-content p:last-child { margin-bottom: 0; }

/* ---------- Timeline ---------- */
.timeline-heading {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  margin-bottom: 1rem;
  margin-top: 2.5rem;
}
.timeline-heading:first-of-type { margin-top: 0; }

.timeline {
  display: grid;
  gap: 1rem;
}

.timeline-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}
.section-alt .timeline-item { background: var(--color-bg); }

.timeline-item-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.timeline-item h4 {
  font-size: 1.02rem;
  font-weight: 700;
}

.timeline-org {
  color: var(--color-text-muted);
  margin-top: 0.2rem;
  font-size: 0.95rem;
}

.timeline-date {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-top: 0.35rem;
}

.badge {
  flex-shrink: 0;
  background: color-mix(in srgb, var(--color-primary) 15%, transparent);
  color: var(--color-primary);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}

/* ---------- Chip list ---------- */
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.chip-list li {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ---------- Contact ---------- */
.contact-inner { text-align: center; }
.contact-lede {
  color: var(--color-text-muted);
  max-width: 50ch;
  margin: 0 auto 1.75rem;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: 1.75rem;
}
.footer-inner {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  text-align: center;
}
.footer-inner a {
  color: var(--color-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.footer-inner a:hover { color: var(--color-primary); }