.cif-viewer-app {
  --cifv-bg: #ffffff;
  --cifv-panel-bg: #fafafa;
  --cifv-fg: #000000;
  --cifv-border: #cccccc;

  font-family: system-ui, sans-serif;
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
  color: var(--cifv-fg);
}

.cif-viewer-app h1 {
  text-align: center;
}

.cif-viewer-app #panel {
  background: var(--cifv-panel-bg);
  border-radius: 20px;
  padding: 1.5rem;
}

.cif-viewer-app textarea {
  width: 100%;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.85rem;
  box-sizing: border-box;
  background: var(--cifv-bg);
  color: var(--cifv-fg);
  border: 1px solid var(--cifv-border);
}

.cif-viewer-app #amcHeaderOutput,
.cif-viewer-app #amcToCifOutput,
.cif-viewer-app #citationInput,
.cif-viewer-app #citationOutput {
  overflow-y: hidden;
}

.cif-viewer-app .cif-viewer-btn {
  /* Keep the host theme's own button coloring (background/text/border-radius) -
     only override its sizing, which is usually set with !important for theme/
     page-builder button styles and so needs !important here too to actually win. */
  margin-bottom: 0.5rem !important;
  font-size: 0.9rem !important;
  line-height: normal !important;
  padding: 0.35rem 0.9rem !important;
  min-height: 0 !important;
  min-width: 0 !important;
}

.cif-viewer-app #copyHeaderBtn {
  display: block;
  margin-top: 0.5rem;
}

.cif-viewer-app #apiSection label,
.cif-viewer-app #apiSection button {
  display: block;
  margin-bottom: 0.5rem;
}

.cif-viewer-app #apiSection label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.cif-viewer-app #apiSection label span {
  display: inline-block;
  width: 6.5rem;
  flex-shrink: 0;
}

.cif-viewer-app #crystalSystemDisplay {
  font-weight: bold;
}

.cif-viewer-app .matrix-table {
  border-collapse: collapse;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.9rem;
  margin: 0.25rem 0 0.75rem;
}

.cif-viewer-app .matrix-table th,
.cif-viewer-app .matrix-table td {
  padding: 0.5rem 1rem;
  text-align: center;
  border: 1px solid var(--cifv-border);
}

.cif-viewer-app .matrix-table thead th,
.cif-viewer-app .matrix-table tbody th {
  background: var(--cifv-panel-bg);
  font-style: italic;
  font-weight: 600;
}

.cif-viewer-app .matrix-table td.diagonal {
  background: #eef4ff;
  font-weight: 600;
}


/* Theme button styles often set display, which would override the hidden
   attribute on the (not yet usable) Send buttons. */
.cif-viewer-app [hidden] {
  display: none !important;
}

.cif-viewer-app .drop-zone {
  position: relative;
  display: block;
  margin: 0.5rem 0 1rem;
  padding: 1.5rem 1rem;
  border: 2px dashed var(--cifv-border);
  border-radius: 12px;
  background: var(--cifv-bg);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
}

.cif-viewer-app .drop-zone:hover,
.cif-viewer-app .drop-zone:focus-within {
  border-color: #6a8fd8;
}

.cif-viewer-app .drop-zone.dragover {
  border-color: #3b6fd8;
  background: #eef4ff;
}

/* Visually hidden but still focusable, so keyboard users can open the picker. */
.cif-viewer-app .drop-zone input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
}

.cif-viewer-app .drop-zone-prompt {
  display: block;
  font-size: 1.05rem;
}

.cif-viewer-app .drop-zone-link {
  color: #3b6fd8;
  text-decoration: underline;
}

.cif-viewer-app .drop-zone-file {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.cif-viewer-app .drop-zone-file:empty {
  display: none;
}