/* Theme and page foundation */
html.datamosh-root { color-scheme: light; }

body.datamosh-body {
  --dm-background: #f4f6f8;
  --dm-surface: #ffffff;
  --dm-subtle: #f6f8fa;
  --dm-border: #d0d7de;
  --dm-text: #1f2328;
  --dm-muted: #57606a;
  --dm-accent: #0969da;
  --dm-accent-hover: #0757b5;
  --dm-on-accent: #ffffff;
  --dm-danger: #cf222e;
  --dm-success: #1a7f37;
  --dm-warning: #9a6700;
  --dm-focus-ring: rgba(9, 105, 218, 0.25);
  --dm-notice: #ddf4ff;
  --dm-notice-border: #b6e3ff;
  --dm-notice-text: #0550ae;
  --dm-drop-border: #8c959f;
  --dm-preview: #111820;
  --dm-preview-header: #161b22;
  --dm-preview-divider: #3d444d;
  --dm-preview-text: #f0f6fc;
  --dm-media-background: #000000;
  --dm-radius: 12px;
  --dm-card-radius: 10px;
  --dm-control-radius: 8px;
  --dm-control-height: 38px;
  --dm-control-gap: 10px;
  --dm-gap: 14px;
  --dm-panel-padding: 18px;
  --dm-shadow: 0 14px 36px rgba(31, 35, 40, 0.08);
  --dm-font-section-heading: 1.1rem;
  --dm-font-meta: 0.8rem;
  --dm-font-help: 0.86rem;
  --dm-font-about-heading: 0.95rem;
  min-height: 100vh;
  margin: 0;
  color: var(--dm-text);
  background: var(--dm-background);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

.datamosh-page,
.datamosh-page * { box-sizing: border-box; }

main.datamosh-page {
  width: min(1220px, calc(100% - 32px));
  margin-inline: auto;
  padding-block: 38px;
}

/* Page heading and shared surfaces */
.datamosh-page-header { margin-bottom: 18px; }
.datamosh-page-header h1 { margin: 0; font-size: clamp(1.7rem, 3vw, 2.2rem); }
.datamosh-page-header > p { margin: 8px 0 0; color: var(--dm-muted); line-height: 1.7; }
.datamosh-page .breadcrumb { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; color: var(--dm-muted); font-size: 0.9rem; }
.datamosh-page a { color: var(--dm-accent); font-weight: 700; text-decoration: none; }
.datamosh-page a:hover, .datamosh-page a:focus-visible { text-decoration: underline; }

.datamosh-notice,
.datamosh-panel,
.datamosh-about {
  margin-bottom: 16px;
  border: 1px solid var(--dm-border);
  border-radius: var(--dm-radius);
  background: var(--dm-surface);
  box-shadow: var(--dm-shadow);
}

.datamosh-notice { padding: 12px 14px; color: var(--dm-notice-text); border-color: var(--dm-notice-border); background: var(--dm-notice); line-height: 1.65; }
.datamosh-panel, .datamosh-about { padding: var(--dm-panel-padding); }
.datamosh-panel h2, .datamosh-panel h3, .datamosh-about h2 { margin: 0; }
.datamosh-panel h2 { font-size: var(--dm-font-section-heading); }
.datamosh-panel-description { margin: 6px 0 0; color: var(--dm-muted); }

.datamosh-toolbar,
.datamosh-actions,
.datamosh-inline-control,
.datamosh-range-actions,
.datamosh-progress-row { display: flex; align-items: center; flex-wrap: wrap; gap: var(--dm-control-gap); }
.datamosh-toolbar { justify-content: space-between; }

/* Form controls and action buttons */
.datamosh-page :is(button, select, input[type="text"], input[type="number"]) {
  min-height: var(--dm-control-height);
  color: var(--dm-text);
  border: 1px solid var(--dm-border);
  border-radius: var(--dm-control-radius);
  background: var(--dm-surface);
  font: inherit;
}
.datamosh-page :is(button, select) { padding: 7px 12px; }
.datamosh-page input:is([type="text"], [type="number"]) { width: 100%; padding: 7px 9px; }
.datamosh-page button { background: var(--dm-subtle); font-weight: 700; cursor: pointer; }
.datamosh-page .datamosh-button-primary,
.datamosh-page .datamosh-download { color: var(--dm-on-accent); border-color: var(--dm-accent); background: var(--dm-accent); }
.datamosh-page .datamosh-button-primary:hover,
.datamosh-page .datamosh-download:hover { color: var(--dm-on-accent); background: var(--dm-accent-hover); text-decoration: none; }
.datamosh-page .datamosh-button-danger { color: var(--dm-danger); }

/* File input and shared cards */
.datamosh-drop-zone {
  display: grid;
  place-items: center;
  min-height: 180px;
  margin-top: var(--dm-gap);
  padding: 28px;
  color: var(--dm-muted);
  border: 2px dashed var(--dm-drop-border);
  border-radius: var(--dm-card-radius);
  background: var(--dm-subtle);
  text-align: center;
  cursor: pointer;
}
.datamosh-drop-zone > * { display: block; }
.datamosh-drop-zone strong { margin-bottom: 7px; color: var(--dm-text); font-size: 1.05rem; }
.datamosh-drop-zone small { margin-top: 8px; }

.datamosh-selected-file,
.datamosh-range-field,
.datamosh-preview-card,
.datamosh-result-details {
  border: 1px solid var(--dm-border);
}

.datamosh-selected-file,
.datamosh-range-field,
.datamosh-preview-card,
.datamosh-empty-result,
.datamosh-result video,
.datamosh-result-details {
  border-radius: var(--dm-card-radius);
}

.datamosh-selected-file,
.datamosh-range-field,
.datamosh-empty-result,
.datamosh-result-details {
  background: var(--dm-subtle);
}

.datamosh-selected-file { margin-top: var(--dm-gap); padding: var(--dm-gap); }
.datamosh-file-name { margin: 0 0 12px; font-weight: 800; overflow-wrap: anywhere; }
.datamosh-file-info,
.datamosh-settings-grid,
.datamosh-preview-grid,
.datamosh-about-grid {
  display: grid;
  grid-template-columns: repeat(var(--dm-grid-columns), minmax(0, 1fr));
}

.datamosh-file-info { --dm-grid-columns: 4; gap: var(--dm-control-gap); margin: 0; }
.datamosh-file-info div { min-width: 0; padding: 10px; border: 1px solid var(--dm-border); border-radius: 8px; background: var(--dm-surface); }
.datamosh-file-info dt { color: var(--dm-muted); font-size: var(--dm-font-meta); }
.datamosh-file-info dd { margin: 5px 0 0; overflow-wrap: anywhere; font-weight: 700; }

/* Effect and output settings */
.datamosh-settings-grid { --dm-grid-columns: 4; gap: var(--dm-gap); margin-top: var(--dm-gap); }
.datamosh-field, .datamosh-range-field { display: grid; align-content: start; gap: 7px; color: var(--dm-muted); font-weight: 700; }
.datamosh-field select { width: 100%; }
.datamosh-inline-control { flex-wrap: nowrap; }
.datamosh-inline-control input { min-width: 0; flex: 1; }
.datamosh-range-field { grid-template-columns: 1fr auto; padding: 12px; }
.datamosh-range-field input { grid-column: 1 / -1; width: 100%; accent-color: var(--dm-accent); }
.datamosh-range-field output { color: var(--dm-text); font-family: "Cascadia Code", Consolas, monospace; }
.datamosh-checkbox { display: flex; align-items: center; gap: 8px; min-height: var(--dm-control-height); align-self: end; color: var(--dm-muted); font-weight: 700; }
.datamosh-checkbox input { width: 17px; height: 17px; accent-color: var(--dm-accent); }

/* Video preview */
.datamosh-preview-grid { --dm-grid-columns: 2; gap: var(--dm-gap); margin-top: var(--dm-gap); }
.datamosh-preview-card { min-width: 0; margin: 0; overflow: hidden; background: var(--dm-preview); }
.datamosh-preview-card figcaption { padding: 9px 12px; color: var(--dm-preview-text); border-bottom: 1px solid var(--dm-preview-divider); background: var(--dm-preview-header); font-weight: 700; }
.datamosh-preview-card :is(video, canvas) { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: contain; background: var(--dm-media-background); }
.datamosh-preview-help { margin: var(--dm-control-gap) 0 0; color: var(--dm-muted); font-size: var(--dm-font-help); }

.datamosh-output-settings { --dm-grid-columns: 6; }
.datamosh-range-actions { margin-top: var(--dm-gap); }
.datamosh-range-actions span { color: var(--dm-muted); font-weight: 700; }
.datamosh-progress-row { margin-top: var(--dm-gap); flex-wrap: nowrap; }
.datamosh-progress-row progress { width: 100%; height: 14px; accent-color: var(--dm-accent); }
.datamosh-progress-row output { min-width: 3.2em; text-align: end; font-weight: 700; }
.datamosh-message { min-height: 44px; margin: var(--dm-control-gap) 0 0; padding: 11px 14px; color: var(--dm-muted); border-radius: var(--dm-control-radius); background: var(--dm-subtle); line-height: 1.5; }

/* Conversion result */
.datamosh-empty-result { display: grid; place-items: center; min-height: 170px; margin-top: var(--dm-gap); color: var(--dm-muted); border: 1px dashed var(--dm-border); }
.datamosh-result { display: grid; grid-template-columns: minmax(300px, 1.4fr) minmax(260px, 1fr); gap: var(--dm-gap); margin-top: var(--dm-gap); }
.datamosh-result video { display: block; width: 100%; max-height: 520px; background: var(--dm-media-background); }
.datamosh-result-details { align-self: start; min-width: 0; padding: var(--dm-gap); }
.datamosh-result-details h3 { overflow-wrap: anywhere; }
.datamosh-result-details p { color: var(--dm-muted); line-height: 1.6; }
.datamosh-page .datamosh-download { display: inline-flex; align-items: center; justify-content: center; min-height: var(--dm-control-height); padding: 7px 14px; border: 1px solid var(--dm-accent); border-radius: var(--dm-control-radius); }

/* Usage notes */
.datamosh-about { line-height: 1.7; }
.datamosh-about > p { color: var(--dm-muted); }
.datamosh-about-grid { --dm-grid-columns: 2; gap: 28px; }
.datamosh-about h3 { margin: 18px 0 6px; font-size: var(--dm-font-about-heading); }
.datamosh-about :is(ul, ol) { margin: 6px 0 0; padding-left: 22px; }

/* Interactive states */
.datamosh-page button:disabled { opacity: 0.52; cursor: not-allowed; }
.datamosh-page :is(button, select, input, .datamosh-drop-zone, .datamosh-download):focus-visible { outline: 3px solid var(--dm-focus-ring); outline-offset: 2px; }
.datamosh-drop-zone.is-dragging { color: var(--dm-accent); border-color: var(--dm-accent); background: var(--dm-notice); }
.datamosh-message[data-status="success"] { color: var(--dm-success); }
.datamosh-message[data-status="warning"] { color: var(--dm-warning); }
.datamosh-message[data-status="error"] { color: var(--dm-danger); }
.datamosh-page [hidden] { display: none !important; }

/* Responsive layout */
@media (max-width: 900px) {
  .datamosh-settings-grid,
  .datamosh-output-settings,
  .datamosh-file-info { --dm-grid-columns: 2; }
}

@media (max-width: 640px) {
  main.datamosh-page { width: min(100% - 20px, 1220px); padding-block: 20px; }
  .datamosh-toolbar { align-items: stretch; flex-direction: column; }
  .datamosh-actions { width: 100%; }
  .datamosh-actions button { flex: 1; }
  .datamosh-settings-grid,
  .datamosh-output-settings,
  .datamosh-preview-grid,
  .datamosh-file-info,
  .datamosh-about-grid { --dm-grid-columns: 1; }
  .datamosh-result { grid-template-columns: minmax(0, 1fr); }
  .datamosh-drop-zone { min-height: 150px; padding: 20px; }
}