:root {
  --navy: #06284c;
  --navy-light: #123f6b;
  --background: #f5f7fa;
  --card: #ffffff;
  --text: #233244;
  --muted: #617185;
  --border: #dce4ec;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.6;
}

.site-container {
  max-width: 1150px;
  margin: 0 auto;
  padding: 0 28px;
}

.site-header {
  padding: 56px 0 36px;
  border-bottom: 1px solid var(--border);
}

.brand {
  color: var(--navy);
  font-size: 2.6rem;
  font-weight: 750;
  letter-spacing: -1.5px;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.intro {
  padding: 48px 0 30px;
}

.intro h1 {
  margin: 0 0 10px;
  color: var(--navy);
  font-size: 1.7rem;
}

.intro p {
  max-width: 700px;
  margin: 0;
  color: var(--muted);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.tool-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 30px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 4px 16px rgba(0, 20, 45, 0.035);
  transition: transform 0.2s, box-shadow 0.2s,
    border-color 0.2s;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: #a5b9cd;
  box-shadow: 0 12px 28px rgba(0, 20, 45, 0.09);
}

.tool-card:focus-visible {
  outline: 3px solid #2b78c5;
  outline-offset: 4px;
}

.tool-icon,
.archive-icon {
  width: 76px;
  height: 76px;
  margin-bottom: 22px;
}

.tool-icon {
  object-fit: contain;
}

.archive-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--navy);
  border-radius: 16px;
}

.archive-icon svg {
  width: 48px;
  height: 48px;
  stroke: #d8d2c7;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tool-card h2 {
  margin: 0 0 12px;
  color: var(--navy);
  font-size: 1.25rem;
  line-height: 1.3;
}

.tool-card p {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 0.96rem;
}

.card-link {
  margin-top: auto;
  color: var(--navy-light);
  font-weight: 650;
  font-size: 0.94rem;
}

.site-footer {
  margin-top: 75px;
  padding: 24px 0 35px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 850px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .site-header {
    padding-top: 35px;
  }

  .brand {
    font-size: 2.2rem;
  }

  .intro {
    padding-top: 35px;
  }

  .tool-card {
    padding: 25px;
  }
}