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

:root {
  --text: #0f1f1a;
  --muted: #4a6860;
  --faint: #8aada6;
  --bg: #f8faf7;
  --surface: #eef7f4;
  --rule: #c8ddd8;
  --accent: #0e7f6e;
  --accent-light: #d4f0e8;
  --accent-mid: #7acbb8;
  --warm: #e07020;
  --warm-light: #fff0e0;
  --reef: #006680;
  --reef-light: #cceffa;
  --purple: #5a3d8a;
  --purple-light: #f0ecf8;
  --serif: 'DM Serif Display', Georgia, serif;
  --sans: 'Inter', system-ui, sans-serif;
}

html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--sans); font-weight: 400; background: var(--bg); color: var(--text); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }

nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.25rem 2.5rem;
  background: var(--bg); border-bottom: 1px solid var(--rule);
}
nav .wordmark { font-family: var(--serif); font-size: 1rem; color: var(--text); }
nav ul { list-style: none; display: flex; gap: 2rem; }
nav ul a { font-size: 0.8125rem; color: var(--muted); letter-spacing: 0.04em; text-transform: uppercase; transition: color 0.2s; }
nav ul a:hover { color: var(--text); }

.marquee-wrap { border-bottom: 1px solid #c45e10; border-top: 1px solid #c45e10; background: var(--warm); overflow: hidden; padding: 0.6rem 0; margin-top: 58px; }
.marquee-track { display: flex; width: max-content; animation: marquee 55s linear infinite; }
.marquee-track:hover { animation-play-state: paused; }
.marquee-track span { font-size: 0.75rem; color: #fff; letter-spacing: 0.04em; white-space: nowrap; padding: 0 1.5rem; }
.marquee-track span.dot { color: rgba(255,255,255,0.5); padding: 0; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .marquee-track { animation: none; } }

.section-wrap { max-width: 1100px; margin: 0 auto; }
section { padding: 5rem 2.5rem; border-top: 1px solid var(--rule); }
.section-label { font-size: 0.6875rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); margin-bottom: 3rem; }

.tag { font-size: 0.6875rem; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; padding: 0.2rem 0.6rem; border-radius: 2px; }
.tag-green  { background: var(--accent-light); color: var(--accent); }
.tag-warm   { background: var(--warm-light);   color: var(--warm); }
.tag-blue   { background: var(--reef-light);   color: var(--reef); }
.tag-purple { background: var(--purple-light); color: var(--purple); }

.interests { padding: 1.25rem; background: var(--accent-light); border-left: 3px solid var(--accent); border-radius: 0 4px 4px 0; }
.interests-label { font-size: 0.6875rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.5rem; font-weight: 500; }
.interests p { font-size: 0.875rem; color: var(--accent); }

.contact-block { background: var(--accent); border-radius: 8px; padding: 3rem; display: flex; flex-direction: column; gap: 1.5rem; }
.contact-block p { font-family: var(--serif); font-size: 2rem; color: #fff; max-width: 500px; line-height: 1.3; }
.email-link { display: inline-flex; align-items: center; gap: 0.5rem; font-size: 0.9375rem; color: var(--accent-mid); border-bottom: 1px solid var(--accent-mid); padding-bottom: 2px; transition: color 0.2s, border-color 0.2s; }
.email-link:hover { color: #fff; border-color: #fff; }

footer { border-top: 1px solid var(--rule); padding: 2rem 2.5rem; display: flex; justify-content: space-between; align-items: center; max-width: 1100px; margin: 0 auto; }
footer span { font-size: 0.75rem; color: var(--faint); }

/* CASE STUDY */
.cs-hero { padding: 5rem 2.5rem 3rem; max-width: 800px; }
.cs-hero .back { font-size: 0.8125rem; color: var(--accent); display: inline-flex; align-items: center; gap: 0.4rem; margin-bottom: 2rem; transition: gap 0.2s; }
.cs-hero .back:hover { gap: 0.7rem; }
.cs-hero h1 { font-family: var(--serif); font-size: clamp(2rem, 4vw, 3rem); font-weight: 400; line-height: 1.15; color: var(--text); margin-bottom: 1rem; }
.cs-hero .subtitle { font-size: 1.125rem; color: var(--muted); line-height: 1.6; margin-bottom: 2rem; }
.cs-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 2rem; }
.cs-meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 1.5rem; padding: 2rem; background: var(--surface); border-radius: 4px; margin-bottom: 0; }
.cs-meta-item label { font-size: 0.6875rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); display: block; margin-bottom: 0.3rem; }
.cs-meta-item span { font-size: 0.9375rem; color: var(--text); }

.cs-body { max-width: 800px; margin: 0 auto; padding: 0 2.5rem 5rem; }
.cs-body h2 { font-family: var(--serif); font-size: 1.6rem; font-weight: 400; color: var(--text); margin: 3rem 0 1rem; }
.cs-body p { font-size: 0.9375rem; color: var(--muted); line-height: 1.8; margin-bottom: 1rem; }
.cs-body img { width: 100%; border-radius: 4px; display: block; margin: 1.5rem 0; }
.cs-body .callout { background: var(--surface); border-left: 3px solid var(--accent); padding: 1.25rem 1.5rem; border-radius: 0 4px 4px 0; margin: 2rem 0; }
.cs-body .callout p { color: var(--text); font-size: 1rem; margin: 0; }
.cs-findings { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.cs-finding { background: var(--surface); padding: 1.25rem; border-radius: 4px; border-top: 3px solid var(--accent); }
.cs-finding h4 { font-size: 0.8125rem; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.5rem; }
.cs-finding p { font-size: 0.875rem; color: var(--muted); margin: 0; line-height: 1.6; }
.cs-stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: 2rem 0; }
.cs-stat { background: var(--accent); border-radius: 4px; padding: 1.5rem; text-align: center; }
.cs-stat .num { font-family: var(--serif); font-size: 2.5rem; color: #fff; display: block; line-height: 1; margin-bottom: 0.4rem; }
.cs-stat .lbl { font-size: 0.75rem; color: var(--accent-mid); letter-spacing: 0.06em; text-transform: uppercase; }

@media (max-width: 680px) {
  nav { padding: 1rem 1.25rem; }
  nav ul { gap: 1.25rem; }
  .marquee-wrap { margin-top: 52px; }
  section { padding: 3rem 1.25rem; }
  .cs-hero { padding: 4rem 1.25rem 2rem; }
  .cs-body { padding: 0 1.25rem 3rem; }
  .cs-stat-row { grid-template-columns: 1fr; }
  .contact-block { padding: 2rem 1.5rem; }
  .contact-block p { font-size: 1.5rem; }
  footer { flex-direction: column; gap: 0.5rem; text-align: center; }
}