:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #767676;
  --border: #e6e6e6;
  --card-bg: #f2f2f2;
  --card-media-bg: #e4e4e4;
  --card-radius: 16px;
  --gap: clamp(2.5rem, 6vw, 4.5rem);
  --side: clamp(16px, 3vw, 40px);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 96%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Helvetica Neue",
    Arial, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  letter-spacing: -0.02em;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--side);
}

/* Header */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  padding: 2rem 0 2.5rem;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0em;
  color: var(--muted);
}

.status .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #2bb673;
  flex: none;
}

.nav-group {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

nav.main-nav {
  display: flex;
  gap: 0.6em;
  font-size: 0.85rem;
}

nav.main-nav a {
  color: var(--muted);
}

nav.main-nav a.is-current {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 3px;
}

nav.main-nav a:hover {
  color: var(--fg);
}

.contact-email {
  font-size: 0.85rem;
  color: var(--muted);
  white-space: nowrap;
}

.contact-email:hover {
  color: var(--fg);
}

/* Intro */

.intro {
  padding: 1.5rem 0 2.5rem;
}

.intro p {
  margin: 0;
  max-width: 46ch;
  color: var(--muted);
  font-size: 0.95rem;
}

hr.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0 0 var(--gap);
}

/* Section */

.section-title {
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 var(--gap);
}

/* Tool grid */

.tool-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem 1.75rem;
}

.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border-radius: var(--card-radius);
  padding: 1.1rem;
}

.tool-media {
  aspect-ratio: 4 / 3;
  border-radius: calc(var(--card-radius) - 6px);
  background: var(--card-media-bg);
  overflow: hidden;
  margin-bottom: 1rem;
}

.tool-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.tool-category {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.tool-title {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.tool-desc {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.88rem;
  flex-grow: 1;
}

.tool-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3em 1em;
  font-size: 0.82rem;
}

.tool-links a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--border);
}

.tool-links a:hover {
  text-decoration-color: var(--fg);
}

.empty-state {
  grid-column: 1 / -1;
  padding: var(--gap) 0;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 1100px) {
  .tool-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 800px) {
  .tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
}

/* Footer */

.site-footer {
  padding: var(--gap) 0 3rem;
  color: var(--muted);
  font-size: 0.8rem;
}

@media (max-width: 480px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  nav.main-nav {
    flex-wrap: wrap;
  }
}