:root {
  --bg: #f7f9f7;
  --paper: #ffffff;
  --ink: #1f2426;
  --muted: #5f6768;
  --line: rgba(31, 36, 38, 0.14);
  --teal: #1f6672;
  --shadow: 0 18px 50px rgba(31, 36, 38, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(247, 249, 247, 0.88)),
    radial-gradient(circle at 12% 0%, rgba(31, 102, 114, 0.12), transparent 28%),
    radial-gradient(circle at 88% 16%, rgba(82, 122, 82, 0.12), transparent 25%),
    var(--bg);
  font-family: "Avenir Next", "Segoe UI", system-ui, sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

h2,
h3,
p {
  margin: 0;
}

h2,
h3 {
  font-family: Iowan Old Style, Palatino Linotype, Book Antiqua, Georgia, serif;
}

main,
.site-footer {
  width: min(780px, calc(100vw - 2rem));
  margin: 0 auto;
}

.tools-section {
  padding: 3.5rem 0 4rem;
}

.section-heading {
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(2.1rem, 4vw, 4rem);
  line-height: 0.95;
}

.tool-card p {
  color: var(--muted);
  line-height: 1.58;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 1.25rem;
}

.filter-button {
  font-size: 0.94rem;
  font-weight: 600;
}

.filter-button {
  min-height: 2.45rem;
  padding: 0 0.9rem;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.78);
  cursor: pointer;
}

.filter-button:hover,
.filter-button:focus-visible,
.filter-button.active {
  color: #ffffff;
  border-color: #1f2426;
  background: #1f2426;
}

.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.tool-card {
  display: grid;
  gap: 0.9rem;
  align-content: start;
  padding: 1.35rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.tool-card.hidden {
  display: none;
}

.tool-card-top {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
}

.tool-version {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h3 {
  font-size: clamp(1.55rem, 2.2vw, 2.05rem);
  line-height: 1;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tag-list span {
  padding: 0.42rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  color: var(--muted);
  background: rgba(237, 244, 239, 0.72);
  font-size: 0.78rem;
  font-weight: 600;
}

.title-link:hover,
.title-link:focus-visible {
  color: var(--teal);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem 0 2.5rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

@media (max-width: 860px) {
  .site-footer {
    align-items: start;
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .tools-section {
    padding: 3.25rem 0;
  }
}