/* ============================================================
   Shared site styles
   Reset, design tokens, header/nav, and footer used by every
   page. Case-study visual styles (hero, photo blocks, task
   layout, etc.) are scoped to that page's own stylesheet in
   /assets/css/<project>.css and are NOT duplicated here.
   ============================================================ */

:root {
  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);

  --bg: #F3F4EF;
  --surface: #EAE8E0;
  --text: #201F1B;
  --muted: #6B6F64;
  --accent: #3E5C57;
  --accent-soft: #cdd8d3;
  --line: #D7D5CB;

  --serif: "Spectral", "Iowan Old Style", "Palatino Linotype", serif;
  --sans: "Karla", -apple-system, "Segoe UI", sans-serif;
}

html {
  scroll-padding-top: calc(88px + env(safe-area-inset-top, 0px));
  scroll-behavior: smooth;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

body {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- Header ---------- */

header.site {
  position: sticky;
  top: 0;
  top: env(safe-area-inset-top, 0px);
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  max-width: 920px;
  margin: 0 auto;
}

.wordmark {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
}

/* Home page nav */
nav.site-nav {
  display: flex;
  gap: 28px;
}

nav.site-nav a {
  font-size: 15px;
  text-decoration: none;
  color: var(--text);
  position: relative;
  padding-bottom: 2px;
}

nav.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0%;
  height: 1px;
  background: var(--accent);
  transition: width 0.25s ease;
}

nav.site-nav a:hover::after { width: 100%; }

/* Case-study "back to home" link, top-right of header */
.back-link {
  font-size: 14px;
  text-decoration: none;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.back-link:hover { color: var(--text); }
.back-link svg { display: block; }

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

footer.site {
  padding: 32px 32px calc(32px + env(safe-area-inset-bottom, 0px));
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
  color: var(--muted);
}
footer.site a { text-decoration: none; color: var(--muted); border-bottom: 1px solid transparent; }
footer.site a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.footer-links { display: flex; gap: 20px; }

/* Bottom-of-page "back to all work" nav, used on every case study */
.case-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 40px 0;
  border-top: 1px solid var(--line);
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}
.case-nav a {
  text-decoration: none;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}
.case-nav a:hover { color: var(--accent); }

@media (max-width: 640px) {
  .header-inner { padding: 16px 20px; }
  .wrap { padding: 0 20px; }
  footer.site { padding: 28px 20px; flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

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