.site-container {
  width: min(100% - 40px, 1180px);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid rgba(226, 232, 240, .9);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: 70px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -.03em;
  font-size: 1.15rem;
  white-space: nowrap;
}

.brand::before {
  content: "AD";
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-size: .72rem;
  letter-spacing: -.02em;
  box-shadow: var(--shadow-small);
}

.main-navigation {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-navigation a {
  padding: 9px 11px;
  border-radius: 9px;
  text-decoration: none;
  color: var(--color-muted);
  font-size: .92rem;
  font-weight: 600;
}

.main-navigation a:hover {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.menu-toggle {
  display: none;
  margin-left: auto;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  width: 42px;
  height: 42px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1.2rem;
}

main.site-container {
  min-height: calc(100vh - 140px);
}

.site-footer {
  margin-top: 70px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.footer-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted);
  font-size: .88rem;
}

.hero {
  padding: 78px 0 56px;
  text-align: center;
}

.hero h1 {
  margin: 0 auto 14px;
  max-width: 760px;
  font-size: clamp(2.1rem, 5vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -.045em;
}

.hero p {
  max-width: 650px;
  margin: 0 auto 28px;
  color: var(--color-muted);
  font-size: 1.08rem;
}

.tool-search {
  width: min(100%, 680px);
  margin: 0 auto;
  position: relative;
}

.tool-search input {
  width: 100%;
  min-height: 58px;
  padding: 0 20px 0 48px;
  border: 1px solid var(--color-border);
  border-radius: 16px;
  background: var(--color-surface);
  box-shadow: var(--shadow-medium);
  color: var(--color-text);
  font-size: 1rem;
}

.tool-search::before {
  content: "⌕";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-52%);
  color: var(--color-muted);
  font-size: 1.45rem;
  z-index: 1;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin: 32px 0 16px;
}

.section-heading h2 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -.02em;
}

.section-heading p {
  margin: 0;
  color: var(--color-muted);
  font-size: .92rem;
}

.tools-grid,
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.tool-card,
.category-card {
  display: block;
  padding: 22px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-small);
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.tool-card:hover,
.category-card:hover {
  transform: translateY(-3px);
  border-color: #cbd5e1;
  box-shadow: var(--shadow-medium);
}

.tool-card-icon,
.category-card-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 15px;
  border-radius: 12px;
  background: #eff6ff;
  color: var(--color-primary);
  font-weight: 800;
}

.tool-card h3,
.category-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.tool-card p,
.category-card p {
  margin: 0;
  color: var(--color-muted);
  font-size: .9rem;
}

.empty-state {
  padding: 40px;
  text-align: center;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  color: var(--color-muted);
  background: var(--color-surface);
}