/* ─────────────────────────────────────────────────────────────────────────────
   shared.css — Common baseline for all case study pages
   Each case study links this BEFORE its own CSS file.
   ───────────────────────────────────────────────────────────────────────────── */

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Figtree', sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ── Nav ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  height: 64px;
}

/* ── Nav logo ── */
.nav-logo {
  font-family: 'Syne', sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: inherit;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo:hover { opacity: 0.7; }

/* ── Nav links ── */
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-muted, #6A6478);
  letter-spacing: 0.02em;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--accent, #6B3FA0); }

/* ── Résumé button in nav ── */
.nav-resume {
  color: var(--accent, #6B3FA0) !important;
  border: 1px solid var(--accent, #6B3FA0);
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  transition: background 0.2s, color 0.2s !important;
}
.nav-resume:hover {
  background: var(--accent, #6B3FA0);
  color: var(--bg, #fff) !important;
}

/* ── Nav back link (← All Work) — hidden on desktop, shown on mobile ── */
.nav-back {
  display: none;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted, #6A6478);
  letter-spacing: 0.02em;
  transition: color 0.2s;
}
.nav-back svg { width: 14px; height: 14px; }
.nav-back:hover { color: var(--accent, #6B3FA0); }

/* ── Mobile: hide nav-links, show nav-back ── */
@media (max-width: 768px) {
  .nav-inner { padding: 0 1.25rem; }
  .nav-links  { display: none; }
  .nav-back   { display: flex; }
}

/* ── Animations ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── Scroll reveal ── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── Theme toggle button ── */
.theme-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted, #6A6478);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color 0.2s, color 0.2s;
}
.theme-btn:hover { border-color: var(--accent, #6B3FA0); color: var(--text, #18161F); }
.theme-btn svg { width: 14px; height: 14px; fill: currentColor; }

/* Show moon in light mode, sun in dark mode */
.theme-btn .icon-sun  { display: none; }
.theme-btn .icon-moon { display: block; }
[data-theme="dark"]  .theme-btn .icon-sun  { display: block; }
[data-theme="dark"]  .theme-btn .icon-moon { display: none; }
/* South Trail defaults to dark, so light mode shows moon */
[data-theme="light"] .theme-btn .icon-sun  { display: none; }
[data-theme="light"] .theme-btn .icon-moon { display: block; }

/* ── TL;DR Strip (shared across case studies) ── */
.tldr-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin: 2rem 0;
}
.tldr-item {
  padding: 1.4rem 1.5rem;
  border-right: 1px solid var(--border);
}
.tldr-item:last-child { border-right: none; }
.tldr-label {
  font-family: 'Syne', sans-serif;
  font-size: 0.65rem; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.5rem;
}
.tldr-text { font-size: 0.875rem; color: var(--text-muted); line-height: 1.6; }
@media (max-width: 600px) {
  .tldr-strip { grid-template-columns: 1fr; }
  .tldr-item { border-right: none; border-bottom: 1px solid var(--border); }
  .tldr-item:last-child { border-bottom: none; }
}

/* ── Footer (shared across case studies) ── */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}
footer a:hover { opacity: 0.7; }
footer small { font-size: inherit; }

/* ── Deep Dive expandable (shared across case studies) ── */
.deep-dive {
  margin-top: 1rem;
  border: 1px solid var(--border); border-radius: 10px; overflow: hidden;
}
.deep-dive summary {
  padding: 0.85rem 1.2rem;
  font-family: 'Syne', sans-serif; font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent);
  cursor: pointer; list-style: none; user-select: none;
  transition: background 0.15s;
}
.deep-dive summary::-webkit-details-marker { display: none; }
.deep-dive summary:hover { background: var(--accent-dim, rgba(107,63,160,0.08)); }
.deep-dive[open] summary { border-bottom: 1px solid var(--border); }
.deep-dive > * + * { padding: 1rem; }