html { scroll-behavior: smooth; }
body { line-height: 1.6; }

nav { position: sticky; top: 0; background: var(--cream); z-index: 10; }

.page { max-width: 900px; margin: 0 auto; padding: 0 48px 80px; }

.breadcrumb {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mid);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--mint); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

.project-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--mint-light);
  color: #0a6b52;
  font-size: 12px;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}
.tag-dot { width: 6px; height: 6px; background: var(--mint); border-radius: 50%; display: inline-block; }

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(44px, 7vw, 72px);
  line-height: 1.05;
  color: var(--ink);
  margin-bottom: 16px;
}
.hero h1 em { font-style: italic; color: var(--mint); }
.hero-summary {
  max-width: 580px;
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-mid);
  margin-top: 20px;
  font-weight: 300;
}
.hero-meta { display: flex; flex-wrap: wrap; gap: 40px; margin-top: 36px; }
.meta-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mid);
  margin-bottom: 4px;
}
.meta-value { font-size: 15px; font-weight: 500; color: var(--ink); }

.section-nav {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--ink-faint);
  margin-bottom: 64px;
  overflow-x: auto;
}
.section-nav a {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 14px 16px;
  color: var(--ink-mid);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s;
}
.section-nav a:hover { color: var(--ink); }
.section-nav a.active { color: var(--ink); border-bottom-color: var(--ink); }

.section { margin-bottom: 80px; }
.section-label {
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--mint);
  font-weight: 500;
  margin-bottom: 12px;
}
.section-title {
  font-family: var(--serif);
  font-size: clamp(28px, 4vw, 38px);
  color: var(--ink);
  margin-bottom: 24px;
  line-height: 1.15;
}
.prose { font-size: 16px; line-height: 1.75; color: #3A3A3A; max-width: 680px; }
.prose + .prose { margin-top: 16px; }

.challenge-card {
  background: var(--ink);
  color: var(--white);
  padding: 40px;
  border-radius: 16px;
  margin: 40px 0;
}
.challenge-card h3 {
  font-family: var(--serif);
  font-size: 24px;
  margin-bottom: 20px;
  color: var(--white);
}
.challenge-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.challenge-list li {
  font-size: 15px;
  line-height: 1.6;
  color: #C8C8C8;
  padding-left: 20px;
  position: relative;
}
.challenge-list li::before { content: '—'; position: absolute; left: 0; color: var(--mint); }

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  background: var(--ink-faint);
  border-radius: 16px;
  overflow: hidden;
  margin: 40px 0;
}
.step-card { background: var(--white); padding: 28px; }
.step-number {
  font-family: var(--serif);
  font-size: 42px;
  color: var(--ink-faint);
  line-height: 1;
  margin-bottom: 12px;
}
.step-card h4 { font-size: 14px; font-weight: 500; color: var(--ink); margin-bottom: 8px; }
.step-card p { font-size: 14px; color: var(--ink-mid); line-height: 1.6; }

.solution-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0;
  align-items: start;
}
.pain-box { background: #FFF3EE; border: 1px solid #FFD4C2; border-radius: 12px; padding: 20px; }
.pain-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-orange);
  font-weight: 500;
  margin-bottom: 8px;
}
.pain-box p { font-size: 14px; color: #6B3A28; line-height: 1.6; }
.sol-box { background: var(--mint-light); border: 1px solid #A8E8D0; border-radius: 12px; padding: 20px; }
.sol-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #0a6b52;
  font-weight: 500;
  margin-bottom: 8px;
}
.sol-box p { font-size: 14px; color: #0a4a38; line-height: 1.6; }

.hmw-block {
  border-left: 3px solid var(--mint);
  padding: 20px 24px;
  background: var(--mint-light);
  border-radius: 0 12px 12px 0;
  margin: 32px 0;
}
.hmw-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #0a6b52;
  margin-bottom: 6px;
  font-weight: 500;
}
.hmw-block p { font-size: 15px; color: #0a4a38; line-height: 1.6; font-style: italic; }

.metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin: 40px 0;
}
.metric-card { background: var(--white); border: 1px solid var(--ink-faint); border-radius: 16px; padding: 28px; }
.metric-number {
  font-family: var(--serif);
  font-size: 52px;
  color: var(--ink);
  line-height: 1;
  margin-bottom: 8px;
}
.metric-number span { color: var(--mint); }
.metric-desc { font-size: 14px; color: var(--ink-mid); line-height: 1.5; }

.learnings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.learning-item { padding: 24px; border: 1px solid var(--ink-faint); border-radius: 12px; background: var(--white); }
.learning-item p { font-size: 14px; color: #3A3A3A; line-height: 1.65; }

.footer-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 48px;
  border-top: 1px solid var(--ink-faint);
  flex-wrap: wrap;
  gap: 16px;
}
.back-link {
  font-size: 14px;
  color: var(--ink-mid);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color 0.15s;
}
.back-link:hover { color: var(--ink); }

hr { border: none; border-top: 1px solid var(--ink-faint); margin: 48px 0; }

@media (max-width: 700px) {
  .page { padding: 0 24px 60px; }
  .solution-pair { grid-template-columns: 1fr; }
  .hero-meta { gap: 20px; }
}