:root {
  --night: #0A162D;
  --white: #FFFFFF;
  --accent: #179EF9;
  --line: rgb(255 255 255 / 16%);
  color-scheme: dark;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  block-size: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  background: var(--night);
  color: var(--white);
}

button,
a {
  font: inherit;
}

.viewer-shell {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  min-block-size: 100dvh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-block-size: 3.75rem;
  padding: 0.65rem clamp(1rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--line);
}

.wordmark {
  flex: 0 0 auto;
  color: var(--white);
  font-size: 1rem;
  font-weight: 750;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brochure-tabs {
  display: flex;
  justify-content: flex-end;
  gap: 0.25rem;
}

.brochure-tab {
  min-block-size: 2.25rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid transparent;
  border-radius: 0.35rem;
  background: transparent;
  color: rgb(255 255 255 / 78%);
  cursor: pointer;
  font-size: 0.84rem;
  font-weight: 650;
  transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease;
}

.brochure-tab:hover,
.brochure-tab:focus-visible {
  border-color: rgb(23 158 249 / 70%);
  color: var(--white);
  outline: none;
}

.brochure-tab[aria-current="page"] {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--night);
}

.brochure-stage {
  min-block-size: 0;
  background: #071126;
}

#brochure-frame {
  display: block;
  inline-size: 100%;
  block-size: 100%;
  border: 0;
  background: var(--night);
}

.brochure-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0.75rem, 2vw, 2rem);
  min-block-size: 11rem;
  padding: 0.65rem 1rem;
  border-top: 1px solid var(--line);
}

.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-inline-size: 8.25rem;
  min-block-size: 2.75rem;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--accent);
  border-radius: 0.35rem;
  background: var(--accent);
  color: var(--night);
  font-size: 0.9rem;
  font-weight: 750;
  text-decoration: none;
}

.download-button:hover,
.download-button:focus-visible {
  background: transparent;
  color: var(--accent);
  outline: none;
}

.qr-cluster {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.qr-panel {
  display: grid;
  justify-items: center;
  gap: 0.35rem;
}

.qr-box {
  position: relative;
  display: grid;
  flex: 0 0 10rem;
  inline-size: 10rem;
  block-size: 10rem;
  place-items: center;
  overflow: hidden;
  padding: 0.5rem;
  border: 1px solid rgb(10 22 45 / 25%);
  background: var(--white);
  color: var(--night);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.qr-image {
  position: absolute;
  inset: 0.5rem;
  inline-size: calc(100% - 1rem);
  block-size: calc(100% - 1rem);
  object-fit: contain;
  opacity: 0;
}

.qr-box.has-image {
  border-style: solid;
}

.qr-box.has-image .qr-image {
  opacity: 1;
}

.qr-box.has-image .qr-label {
  visibility: hidden;
}

.qr-download {
  color: var(--accent);
  font-size: 0.72rem;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.qr-download:hover,
.qr-download:focus-visible {
  color: var(--white);
  outline: none;
}

.qr-cluster p {
  max-inline-size: 12rem;
  margin: 0;
  color: rgb(255 255 255 / 80%);
  font-size: 0.82rem;
  line-height: 1.35;
}

footer {
  padding: 0.45rem 1rem 0.55rem;
  border-top: 1px solid var(--line);
  color: rgb(255 255 255 / 62%);
  font-size: 0.72rem;
  text-align: center;
}

@media (max-width: 760px) {
  .topbar {
    flex-wrap: wrap;
    gap: 0.55rem;
    padding-block: 0.6rem;
  }

  .brochure-tabs {
    flex: 1 0 100%;
    justify-content: stretch;
  }

  .brochure-tab {
    flex: 1 1 25%;
    min-inline-size: 0;
    padding-inline: 0.35rem;
    font-size: clamp(0.65rem, 2.6vw, 0.8rem);
  }
}

@media (max-width: 500px) {
  .brochure-actions {
    flex-wrap: wrap;
    gap: 0.55rem 1rem;
    min-block-size: 0;
    padding-block: 0.6rem;
  }

  .download-button {
    min-inline-size: 7.5rem;
    min-block-size: 2.25rem;
  }

  .qr-cluster {
    justify-content: center;
    gap: 0.65rem;
  }

  .qr-box {
    flex-basis: 7.5rem;
    inline-size: 7.5rem;
    block-size: 7.5rem;
  }

  .qr-cluster p {
    max-inline-size: 8.5rem;
    font-size: 0.75rem;
  }
}