:root {
  color-scheme: light;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f7fafb;
  color: #1a3a5c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #f7fafb;
  line-height: 1.6;
}

img {
  max-width: 100%;
}

.container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  background: linear-gradient(180deg, #1a3a5c 0%, #2a9d8f 100%);
  color: #ffffff;
  padding: 2rem 0;
}

.brand h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2rem, 2.5vw, 3rem);
}

.brand p {
  margin: 0;
  max-width: 34rem;
  color: rgba(255, 255, 255, 0.92);
}

.hero {
  padding: 3rem 0 1rem;
}

.hero-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.hero-copy {
  max-width: 46rem;
}

.eyebrow {
  margin: 0 0 1rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: #2a9d8f;
  font-size: 0.9rem;
}

.hero-copy h2 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.05;
}

.hero-copy p {
  margin: 0;
  max-width: 36rem;
  color: #334e68;
}

.hero-search {
  background: #f2fbfa;
  border: 1px solid #dbe6ea;
  border-radius: 16px;
  padding: 1.75rem;
}

.hero-search input {
  width: 100%;
  border: 1px solid #b8d7d0;
  border-radius: 12px;
  padding: 1rem 2.5rem 1rem 1rem;
  font-size: 1rem;
  color: #1a3a5c;
}

.hero-search input:focus {
  outline: 2px solid #2a9d8f;
  outline-offset: 2px;
}

.search-input-container {
  position: relative;
}

#clear-search {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: #4b6574;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s ease;
}

#clear-search:hover {
  background: rgba(42, 157, 143, 0.1);
  color: #1a3a5c;
}

#search-help {
  margin-top: 0.75rem;
  color: #4b6574;
  font-size: 0.95rem;
}

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

.section-heading h3 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
}

.section-heading p {
  margin: 0;
  color: #4b6574;
}

.category-section,
.results-section {
  padding: 2rem 0;
}

.category-grid,
.protocol-grid {
  display: grid;
  gap: 1.25rem;
}

.category-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.category-card {
  display: block;
  padding: 1.5rem;
  border-radius: 18px;
  text-decoration: none;
  background: #eef7f6;
  color: #1a3a5c;
  font-weight: 600;
  transition: transform 0.2s ease, background 0.2s ease;
}

.category-card:hover,
.category-card:focus-visible {
  background: #d7f0ea;
  transform: translateY(-2px);
}

.category-card.selected {
  background: #2a9d8f;
  color: white;
}

.results-summary {
  margin: 0 0 1rem;
  color: #4b6574;
}

..protocol-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.protocol-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.protocol-list li {
  background: #f5fbfa;
  border: 1px solid #dde6ea;
  border-radius: 14px;
  padding: 1rem 1.15rem;
  color: #1a3a5c;
}

.section-heading h1,
.section-heading h3 {
  margin: 0 0 0.75rem;
  line-height: 1.1;
}

.section-heading h1 {
  font-size: clamp(2rem, 2.5vw, 2.5rem);
}

.protocol-card {
  background: #ffffff;
  border: 1px solid #e1e8ed;
  border-radius: 18px;
  padding: 1.4rem;
  min-height: 150px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.protocol-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.protocol-card h4 {
  margin: 0 0 0.8rem;
  font-size: 1.1rem;
}

.protocol-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.meta-pill {
  background: #eff9f8;
  color: #1a3a5c;
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  font-size: 0.85rem;
}

.protocol-link {
  text-decoration: none;
  color: #2a9d8f;
  font-weight: 600;
}

.site-footer {
  padding: 1.5rem 0;
  background: #f5f8fb;
  color: #4b6574;
}

.site-footer p {
  margin: 0;
  text-align: center;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1.25fr 1fr;
  }
}

@media (max-width: 560px) {
  .hero {
    padding-top: 1.5rem;
  }

  .hero-search {
    padding: 1.25rem;
  }

  .protocol-card {
    min-height: auto;
  }
}