:root {
  --ink: #162024;
  --muted: #5e6d75;
  --line: #d8e0e5;
  --paper: #f7f8f4;
  --panel: #ffffff;
  --accent: #0f6651;
  --accent-soft: #e7f2ee;
  --shadow: 0 12px 30px rgba(22, 32, 36, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

.site-header {
  border-bottom: 1px solid var(--line);
  padding: 34px clamp(18px, 4vw, 52px);
  background: #fff;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 8px;
  font-size: clamp(34px, 5vw, 54px);
  letter-spacing: 0;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(220px, 1fr));
  gap: 18px;
  padding: 24px clamp(18px, 4vw, 52px) 44px;
}

.tool-card {
  display: block;
  min-height: 220px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: border-color 140ms ease, transform 140ms ease;
}

.tool-card:hover,
.tool-card:focus {
  border-color: var(--accent);
  outline: none;
  transform: translateY(-2px);
}

.tool-card h2 {
  margin-bottom: 10px;
  font-size: 22px;
}

.tool-card p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.45;
}

@media (max-width: 1180px) {
  .tool-grid {
    grid-template-columns: repeat(2, minmax(220px, 1fr));
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 28px 18px;
  }

  .tool-grid {
    grid-template-columns: 1fr;
    padding: 18px;
  }

  .tool-card {
    min-height: 0;
  }
}