:root {
  font-family: "Space Grotesk", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: #111;
  background-color: #f5f7fb;
  line-height: 1.5;
  font-size: 16px;
  --card-bg: #fff;
  --card-border: rgba(15, 23, 42, 0.08);
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --muted: #4b5563;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header,
footer {
  padding: 1.5rem clamp(1rem, 4vw, 4rem);
}

header {
  text-align: left;
}

.hero {
  max-width: 720px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.76rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 9vw, 3rem);
}

main {
  flex: 1;
  display: grid;
  gap: 1.25rem;
  padding: 0 clamp(1rem, 4vw, 4rem) 3rem;
}

.library-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 1.25rem;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  box-shadow: 0 15px 35px rgba(15, 23, 42, 0.08);
}

.library-copy h2 {
  margin: 0;
  font-size: 1.5rem;
}

.library-copy p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.scan-btn {
  border: none;
  border-radius: 999px;
  padding: 0.85rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  display: inline-flex;
  gap: 0.5rem;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, opacity 0.25s ease;
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.25);
}

.scan-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  box-shadow: none;
}

.scan-btn:not(:disabled):active {
  transform: translateY(2px) scale(0.98);
}

.scanner-panel {
  position: relative;
  width: 100%;
  min-height: 220px;
  border-radius: 0.9rem;
  border: 1px dashed var(--card-border);
  background: var(--accent-soft);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.scanner-panel video,
.scanner-panel canvas,
.scanner-panel > div {
  width: 100%;
  height: 100%;
}

.scanner-panel video {
  object-fit: cover;
}

.scan-result {
  font-size: 0.95rem;
  margin: 0;
  color: var(--muted);
}

.scan-result.is-status {
  font-style: italic;
  color: var(--muted);
}

.scan-result.is-error {
  color: #b91c1c;
}

.scan-result strong {
  color: var(--accent);
}

footer {
  background: transparent;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

@media (min-width: 840px) {
  main {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  }
}