:root {
  --ink: #17242f;
  --muted: #5c6872;
  --surface: #ffffff;
  --accent: #0b766e;
  --accent-dark: #07574f;
  --accent-light: #e6f4f2;
  --border: #cfdbd8;
  --shadow: 0 18px 45px rgba(23, 36, 47, 0.1);
  --radius: 18px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: #f6f8f7;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.back-link {
  display: inline-block;
  margin-bottom: 20px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}
.back-link:hover { text-decoration: underline; }

.site-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-nav-inner {
  width: min(100% - 32px, 1080px);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.site-nav-brand {
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.site-nav-brand span { color: var(--accent); }
.site-nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav-links a {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 600;
}
.site-nav-links a:hover { color: var(--accent); text-decoration: none; }
.site-nav-links a.active { color: var(--accent); }

.page {
  width: min(100% - 32px, 1080px);
  margin: 0 auto;
  padding: 48px 0 60px;
}

.hero { padding: 48px 0 36px; }
.hero-eyebrow {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.12;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}
.hero p {
  max-width: 640px;
  color: var(--muted);
  font-size: 1.08rem;
  margin: 0;
}

.section { margin-top: 44px; }
.section-title { font-size: 1.35rem; font-weight: 800; margin: 0 0 6px; }
.section-sub { color: var(--muted); margin: 0 0 22px; font-size: 0.98rem; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 4px 16px rgba(23,36,47,0.06);
  transition: box-shadow 0.2s, transform 0.15s;
  color: var(--ink);
}
.card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  text-decoration: none;
}
.card-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 14px;
}
.card h3 { margin: 0 0 6px; font-size: 1.05rem; font-weight: 750; }
.card p { margin: 0; color: var(--muted); font-size: 0.88rem; line-height: 1.5; }
.card-arrow { margin-top: 14px; font-size: 0.85rem; font-weight: 700; color: var(--accent); }

.tool-cat { margin-bottom: 32px; scroll-margin-top: 80px; }
.tool-cat h2 { font-size: 1.15rem; font-weight: 800; margin: 0 0 4px; color: var(--accent-dark); }
.tool-cat-desc { color: var(--muted); font-size: 0.9rem; margin: 0 0 16px; }
.tool-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.tool-item {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  color: var(--ink);
  transition: box-shadow 0.2s, transform 0.15s;
}
.tool-item:hover {
  box-shadow: 0 8px 24px rgba(23,36,47,0.1);
  transform: translateY(-1px);
  text-decoration: none;
}
.tool-item-name { font-weight: 700; font-size: 0.95rem; margin-bottom: 3px; }
.tool-item-desc { color: var(--muted); font-size: 0.82rem; line-height: 1.45; }
.tool-item.planned { opacity: 0.55; pointer-events: none; }

.site-footer {
  margin-top: 60px;
  padding: 28px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}

@media (max-width: 820px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .tool-list { grid-template-columns: 1fr; }
  .site-nav-links { display: none; }
}
@media (max-width: 540px) {
  .card-grid { grid-template-columns: 1fr; }
  .page { padding: 28px 0 40px; }
  .hero { padding: 24px 0 20px; }
}