:root {
  color-scheme: light dark;
  --bg: #f3f5f1;
  --surface: rgba(255, 255, 255, 0.72);
  --ink: #17211d;
  --muted: #60706a;
  --line: rgba(23, 33, 29, 0.14);
  --accent: #116a68;
  --accent-soft: #d8eeee;
  --warm: #b84d37;
  --blue: #4b65a2;
  --gold: #9a6b17;
  --shadow: 0 22px 60px rgba(23, 33, 29, 0.09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 12% 5%, rgba(17, 106, 104, 0.13), transparent 30rem),
    radial-gradient(circle at 90% 80%, rgba(184, 77, 55, 0.09), transparent 34rem),
    var(--bg);
  color: var(--ink);
}

main {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(48px, 8vw, 104px) 0 48px;
}

.hero {
  max-width: 790px;
  margin-bottom: clamp(52px, 8vw, 88px);
}

.hero h1 {
    letter-spacing: 0.05em;
}

.site-mark {
  display: block;
  margin-bottom: 28px;
  border-radius: 16px;
  box-shadow: 0 10px 28px rgba(23, 33, 29, 0.16);
}

.eyebrow,
.card-kicker {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.75rem, 7vw, 5.8rem);
  font-weight: 690;
  letter-spacing: -0.065em;
  line-height: 0.96;
}

.intro {
  max-width: 670px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.6;
  /* wider kerning */
  letter-spacing: 0.02em;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.tool-grid > h2 {
  grid-column: 1 / -1;
  margin: 0 0 6px;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tool-card {
  min-height: 360px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  overflow: hidden;
  position: relative;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.tool-card::after {
  content: "";
  width: 190px;
  height: 190px;
  position: absolute;
  right: -78px;
  bottom: -94px;
  border-radius: 50%;
  background: var(--card-accent);
  opacity: 0.12;
  transition: transform 200ms ease, opacity 200ms ease;
}

.absorber-card { --card-accent: var(--accent); }
.sbir-card { --card-accent: var(--warm); }
.desk-card { --card-accent: var(--blue); }
.triangle-card { --card-accent: var(--gold); }

.tool-card:hover {
  border-color: var(--card-accent);
  box-shadow: 0 26px 68px rgba(23, 33, 29, 0.14);
  transform: translateY(-4px);
}

.tool-card:hover::after {
  opacity: 0.2;
  transform: scale(1.12);
}

.tool-card:focus-visible {
  outline: 3px solid var(--card-accent);
  outline-offset: 4px;
}

.card-meta {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.card-icon {
  display: block;
  border-radius: 13px;
  box-shadow: 0 7px 20px rgba(23, 33, 29, 0.14);
}

.card-number {
  color: var(--card-accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.card-kicker {
  color: var(--card-accent);
}

.tool-card h3 {
  margin: 0 0 14px;
  font-size: clamp(1.45rem, 2.5vw, 2rem);
  font-weight: 680;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.tool-card p:not(.card-kicker) {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.55;
}

.card-action {
  position: relative;
  z-index: 1;
  color: var(--card-accent);
  font-size: 0.84rem;
  font-weight: 800;
}

.card-action span {
  display: inline-block;
  margin-left: 4px;
  transition: transform 160ms ease;
}

.tool-card:hover .card-action span {
  transform: translateX(4px);
}

footer {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 20px 0 36px;
  color: var(--muted);
  font-size: 0.74rem;
  text-align: center;
}

@media (max-width: 840px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .tool-card {
    min-height: 280px;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121713;
    --surface: rgba(27, 34, 30, 0.78);
    --ink: #edf3ee;
    --muted: #a9b8b0;
    --line: rgba(237, 243, 238, 0.14);
    --accent: #4fb7b2;
    --accent-soft: #173c3b;
    --warm: #ef9a83;
    --blue: #9eb4ed;
    --gold: #e3b85e;
    --shadow: 0 22px 60px rgba(0, 0, 0, 0.28);
  }
}

@media (prefers-reduced-motion: reduce) {
  .tool-card,
  .tool-card::after,
  .card-action span {
    transition: none;
  }
}