/* ── Design tokens ── */
:root {
  --bg:         #f4f4f4;
  --surface:    #e8e8e8;
  --text:       #555;
  --text-dark:  #333;
  --text-muted: #999;
  --accent:     #4a7c59;
  --accent-dk:  #355c40;
  --accent-lt:  #e2ede6;
  --nav-h:      52px;
  --footer-h:   56px;
  --max-w:      900px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Base ── */
html { font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'avenir next', avenir, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-weight: 500; color: var(--text-dark); }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dk); text-decoration: underline; text-underline-offset: 3px; }

/* ── Nav ── */
.proto-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(244,244,244,0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(74,124,89,0.15);
  z-index: 200;
}
.nav-inner {
  padding: 0 max(1rem, calc((100% - var(--max-w)) / 2));
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text-dark);
  text-decoration: none;
}
.nav-logo:hover { color: var(--accent); text-decoration: none; }
.nav-links { display: flex; gap: 1.75rem; }
.nav-links a {
  font-size: 0.875rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.nav-links a:hover { color: var(--accent); text-decoration: none; }
.nav-menu-btn {
  display: none;
  background: none;
  border: none;
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--text);
  cursor: pointer;
  padding: 0;
}
.nav-menu-btn:hover { color: var(--accent); }
.nav-dropdown {
  display: none;
  flex-direction: column;
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  background: rgba(244,244,244,0.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(74,124,89,0.15);
  z-index: 190;
}
.nav-dropdown.open { display: flex; }
.nav-dropdown a {
  padding: 0.75rem max(1rem, calc((100% - var(--max-w)) / 2));
  color: var(--text);
  font-size: 0.9rem;
  border-top: 1px solid rgba(74,124,89,0.08);
  text-decoration: none;
}
.nav-dropdown a:hover { color: var(--accent); background: rgba(74,124,89,0.05); text-decoration: none; }

/* ── Page shell ── */
.page-outer {
  margin-top: var(--nav-h);
  padding-bottom: calc(var(--footer-h) + 2rem);
}

/* ── Hero ── */
.hero-wrap { max-width: var(--max-w); margin: 0 auto; }
.hero-img {
  display: block;
  width: 100%;
  height: 320px;
  object-fit: cover;
  object-position: center 40%;
}
.hero-accent {
  height: 2px;
  background: linear-gradient(to right, transparent 0%, var(--accent) 25%, var(--accent) 75%, transparent 100%);
  opacity: 0.38;
}

/* ── Inner-page header ── */
.page-header {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem 0 1.25rem;
  border-bottom: 1px solid rgba(74,124,89,0.18);
}
.page-title {
  font-size: 1.75rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-dark);
}
.page-content {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem 0 0;
}

/* ── Footer ── */
#footer {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--footer-h);
  background: var(--surface);
  border-top: 1px solid rgba(74,124,89,0.15);
  z-index: 150;
}
.footer-inner {
  padding: 0 max(1rem, calc((100% - var(--max-w)) / 2));
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-copy { font-size: 0.82rem; color: var(--text-muted); }
.footer-icons { display: flex; align-items: center; gap: 0; }
.icon-link { display: flex; align-items: center; padding: 0 5px; }
.icon-link svg path { fill: #aab8c2 !important; transition: fill 0.2s; }
.icon-link.orcid svg path.st1 { fill: #ffffff !important; }
.icon-link.scholar:hover svg path { fill: var(--accent) !important; }
.icon-link.linkedin:hover svg path { fill: #0a66c2 !important; }
.icon-link.orcid:hover svg path.st0 { fill: #a6ce39 !important; }
.icon-link.rgate:hover svg path { fill: #04d4ac !important; }
.icon-link.twitter:hover svg path { fill: #55acee !important; }
.icon-link.strava:hover svg path { fill: #e95950 !important; }

/* ── Responsive ── */
@media (max-width: 60em) {
  .nav-links { display: none; }
  .nav-menu-btn { display: block; }
  .hero-img { height: 200px; }
  .page-header { padding-left: 1rem; padding-right: 1rem; }
  .page-content { padding-left: 1rem; padding-right: 1rem; }
}