:root {
  --bg: #eef0f3;
  --bar: rgba(255,255,255,.94);
  --text: #171717;
  --border: #dedede;
  --shadow: 0 10px 35px rgba(0,0,0,.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  background: var(--bar);
  border-bottom: 1px solid rgba(0,0,0,.08);
  backdrop-filter: blur(14px);
}

.brand { font-size: 18px; font-weight: 700; letter-spacing: .02em; }
.actions { display: flex; align-items: center; gap: 7px; flex-wrap: wrap; justify-content: flex-end; }
.actions button, .link-button {
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: #171717;
  font: inherit;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.actions button:hover, .link-button:hover { background: #f5f5f5; }
#zoomValue { min-width: 52px; text-align: center; font-size: 14px; }

.viewer { padding: 22px 12px 60px; }
.document-shell {
  --zoom: 1;
  width: min(100%, 1100px);
  margin: 0 auto;
  transform-origin: top center;
}

.page {
  display: block;
  width: calc(100% * var(--zoom));
  max-width: none;
  height: auto;
  margin: 0 auto 16px;
  background: #fff;
  box-shadow: var(--shadow);
  border-radius: 1px;
}

.top-button {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 120;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 50%;
  background: #171717;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: .2s ease;
}
.top-button.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.noscript-note { max-width: 700px; margin: 30px auto; padding: 20px; text-align: center; }

@media (max-width: 700px) {
  .topbar { padding: 10px 12px; align-items: flex-start; }
  .brand { padding-top: 8px; }
  .actions { gap: 5px; }
  .actions button, .link-button { min-height: 34px; padding: 0 9px; font-size: 13px; }
  #resetZoom { display: none; }
  .viewer { padding: 10px 0 40px; }
  .page { width: calc(100% * var(--zoom)); margin-bottom: 8px; box-shadow: 0 5px 18px rgba(0,0,0,.10); }
}