html.svg-image-root { color-scheme: light; }
html.svg-image-root[data-theme="dark"] { color-scheme: dark; }

/* Page foundation and theme tokens */
body.svg-image-body {
  --sic-background: #f4f6f8;
  --sic-surface: #ffffff;
  --sic-subtle: #f6f8fa;
  --sic-border: #d0d7de;
  --sic-text: #1f2328;
  --sic-muted: #57606a;
  --sic-accent: #0969da;
  --sic-accent-hover: #0757b5;
  --sic-on-accent: #ffffff;
  --sic-danger: #cf222e;
  --sic-success: #1a7f37;
  --sic-warning: #9a6700;
  --sic-focus: rgba(9, 105, 218, 0.28);
  --sic-notice: #ddf4ff;
  --sic-notice-border: #b6e3ff;
  --sic-notice-text: #0550ae;
  --sic-preview: #1f242b;
  --sic-preview-checker: #323943;
  --sic-radius: 12px;
  --sic-card-radius: 10px;
  --sic-control-radius: 8px;
  --sic-control-height: 38px;
  --sic-gap: 14px;
  --sic-panel-padding: 18px;
  --sic-page-max-width: 1220px;
  --sic-page-inline-gutter: 32px;
  --sic-page-padding-block: 38px;
  --sic-code-input-height: 220px;
  --sic-preview-min-height: 220px;
  --sic-preview-image-max-height: 260px;
  --sic-disabled-opacity: 0.52;
  --sic-code-font: "Cascadia Code", Consolas, monospace;
  --sic-shadow: 0 14px 36px rgba(31, 35, 40, 0.08);
  min-height: 100vh;
  margin: 0;
  color: var(--sic-text);
  background: var(--sic-background);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

body.svg-image-body[data-theme="dark"] {
  --sic-background: #0d1117;
  --sic-surface: #161b22;
  --sic-subtle: #21262d;
  --sic-border: #3d444d;
  --sic-text: #f0f6fc;
  --sic-muted: #9da7b3;
  --sic-accent: #2f81f7;
  --sic-accent-hover: #58a6ff;
  --sic-danger: #ff7b72;
  --sic-success: #56d364;
  --sic-warning: #d29922;
  --sic-focus: rgba(47, 129, 247, 0.35);
  --sic-notice: #111d2f;
  --sic-notice-border: #1f6feb;
  --sic-notice-text: #79c0ff;
  --sic-preview: #0d1117;
  --sic-preview-checker: #21262d;
  --sic-shadow: none;
}

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

main.svg-image-page {
  width: min(var(--sic-page-max-width), calc(100% - var(--sic-page-inline-gutter)));
  margin-inline: auto;
  padding-block: var(--sic-page-padding-block);
}

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

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

.svg-image-notice {
  padding: 12px 14px;
  color: var(--sic-notice-text);
  border-color: var(--sic-notice-border);
  background: var(--sic-notice);
  line-height: 1.65;
}

.svg-image-panel,
.svg-image-about { padding: var(--sic-panel-padding); }
.svg-image-panel h2,
.svg-image-about h2 { margin: 0; }
.svg-image-panel h2 { font-size: 1.1rem; }
.svg-image-panel-description {
  margin: 6px 0 0;
  color: var(--sic-muted);
  line-height: 1.6;
}

.svg-image-panel-header,
.svg-image-actions,
.svg-image-convert-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.svg-image-panel-header { justify-content: space-between; }
.svg-image-actions { justify-content: flex-end; }

/* Form controls */
.svg-image-page :is(button, select, input[type="number"], input[type="color"], textarea) {
  color: var(--sic-text);
  border: 1px solid var(--sic-border);
  border-radius: var(--sic-control-radius);
  background: var(--sic-surface);
  font: inherit;
}

.svg-image-page :is(button, select, input[type="number"], input[type="color"]) { min-height: var(--sic-control-height); }
.svg-image-page :is(button, select) { padding: 7px 12px; }
.svg-image-page input[type="number"] {
  width: 100%;
  padding: 7px 9px;
}
.svg-image-page input[type="color"] {
  width: 100%;
  padding: 4px;
}
.svg-image-page button {
  background: var(--sic-subtle);
  font-weight: 700;
  cursor: pointer;
}

/* Interactive states */
.svg-image-page button:hover:not(:disabled) { border-color: var(--sic-accent); }
.svg-image-page :is(button, select, input, textarea):disabled {
  cursor: not-allowed;
  opacity: var(--sic-disabled-opacity);
}
.svg-image-page :is(button, select, input, textarea):focus-visible,
.svg-image-drop-zone:focus-visible {
  outline: 3px solid var(--sic-focus);
  outline-offset: 2px;
}

.svg-image-page .svg-image-primary-button {
  color: var(--sic-on-accent);
  border-color: var(--sic-accent);
  background: var(--sic-accent);
}
.svg-image-page .svg-image-primary-button:hover:not(:disabled) {
  color: var(--sic-on-accent);
  background: var(--sic-accent-hover);
}

/* SVG input */
.svg-image-drop-zone {
  display: grid;
  place-items: center;
  min-height: 168px;
  margin-top: var(--sic-gap);
  padding: 28px;
  color: var(--sic-muted);
  border: 2px dashed var(--sic-border);
  border-radius: var(--sic-card-radius);
  background: var(--sic-subtle);
  text-align: center;
  cursor: pointer;
}
.svg-image-drop-zone > * { display: block; }
.svg-image-drop-zone strong {
  margin-bottom: 7px;
  color: var(--sic-text);
  font-size: 1.05rem;
}
.svg-image-drop-zone.is-dragover {
  color: var(--sic-accent);
  border-color: var(--sic-accent);
  background: var(--sic-notice);
}

.svg-image-code-input {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 9px;
  margin-top: var(--sic-gap);
}
.svg-image-code-input label {
  grid-column: 1 / -1;
  font-weight: 700;
}
.svg-image-code-input textarea {
  grid-column: 1 / -1;
  width: 100%;
  height: var(--sic-code-input-height);
  padding: 12px;
  resize: none;
  font-family: var(--sic-code-font);
  line-height: 1.55;
  tab-size: 2;
}
.svg-image-code-input button { justify-self: end; }

.svg-image-empty {
  margin-top: var(--sic-gap);
  padding: 28px;
  color: var(--sic-muted);
  border: 1px dashed var(--sic-border);
  border-radius: var(--sic-card-radius);
  background: var(--sic-subtle);
  text-align: center;
}

/* Source and result cards */
.svg-image-card-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sic-gap);
  margin-top: var(--sic-gap);
}

.svg-image-conversion-card {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(220px, 0.95fr);
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--sic-border);
  border-radius: var(--sic-card-radius);
  background: var(--sic-subtle);
}

.svg-image-preview-card {
  min-width: 0;
  margin: 0;
  border-right: 1px solid var(--sic-border);
  background: var(--sic-surface);
}
.svg-image-preview-stage {
  display: grid;
  place-items: center;
  min-height: var(--sic-preview-min-height);
  padding: 12px;
  overflow: hidden;
  background-color: var(--sic-preview);
  background-image: linear-gradient(45deg, var(--sic-preview-checker) 25%, transparent 25%), linear-gradient(-45deg, var(--sic-preview-checker) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, var(--sic-preview-checker) 75%), linear-gradient(-45deg, transparent 75%, var(--sic-preview-checker) 75%);
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-size: 16px 16px;
}
.svg-image-preview-stage img {
  display: block;
  max-width: 100%;
  max-height: var(--sic-preview-image-max-height);
  object-fit: contain;
}
.svg-image-preview-card figcaption {
  padding: 10px 12px;
  overflow-wrap: anywhere;
  font-weight: 700;
}

.svg-image-card-details {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
  padding: 14px;
}
.svg-image-metadata-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin: 0;
}
.svg-image-metadata-list > div {
  min-width: 0;
  padding: 9px;
  border: 1px solid var(--sic-border);
  border-radius: var(--sic-control-radius);
  background: var(--sic-surface);
}
.svg-image-metadata-list dt {
  color: var(--sic-muted);
  font-size: 0.78rem;
}
.svg-image-metadata-list dd {
  margin: 4px 0 0;
  overflow-wrap: anywhere;
  font-weight: 700;
}
.svg-image-metadata-list--stacked { grid-template-columns: 1fr; }
.svg-image-source-details > button {
  align-self: flex-start;
  margin-top: auto;
}
.svg-image-warning-list {
  margin: 0;
  padding-left: 1.3rem;
  color: var(--sic-warning);
  line-height: 1.55;
}
.svg-image-warning-list:empty { display: none; }

/* Conversion settings and progress */
.svg-image-control-field {
  color: var(--sic-muted);
  font-weight: 700;
}
.svg-image-theme-field {
  display: flex;
  align-items: center;
  gap: 8px;
}
.svg-image-field,
.svg-image-range-field {
  display: grid;
  align-content: start;
  gap: 7px;
}
.svg-image-field select { width: 100%; }
.svg-image-settings-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--sic-gap);
  margin-top: var(--sic-gap);
}
.svg-image-range-field {
  grid-template-columns: 1fr auto;
  padding: 11px;
  border: 1px solid var(--sic-border);
  border-radius: var(--sic-control-radius);
  background: var(--sic-subtle);
}
.svg-image-range-field input {
  grid-column: 1 / -1;
  width: 100%;
}
.svg-image-range-field output {
  color: var(--sic-text);
  font-family: var(--sic-code-font);
}
.svg-image-checkbox {
  display: flex;
  align-self: end;
  align-items: center;
  gap: 8px;
  min-height: var(--sic-control-height);
}
.svg-image-checkbox input {
  width: 17px;
  height: 17px;
  accent-color: var(--sic-accent);
}
.svg-image-control-field.is-disabled { opacity: var(--sic-disabled-opacity); }

.svg-image-convert-row { margin-top: 18px; }
.svg-image-convert-row progress {
  min-width: 220px;
  height: 14px;
  flex: 1;
  accent-color: var(--sic-accent);
}
.svg-image-convert-row output {
  min-width: 4ch;
  color: var(--sic-muted);
  font-family: var(--sic-code-font);
  text-align: right;
}
.svg-image-message {
  min-height: 1.5em;
  margin: 10px 0 0;
  color: var(--sic-muted);
}
.svg-image-message[data-tone="success"] { color: var(--sic-success); }
.svg-image-message[data-tone="warning"] { color: var(--sic-warning); }
.svg-image-message[data-tone="error"] { color: var(--sic-danger); }

/* Tool information */
.svg-image-about { line-height: 1.7; }
.svg-image-about h3 {
  margin: 18px 0 6px;
  font-size: 1rem;
}
.svg-image-about ul,
.svg-image-about ol {
  margin-block: 6px;
  padding-left: 1.4rem;
}
.svg-image-about-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}
.svg-image-privacy {
  padding: 12px 14px;
  color: var(--sic-notice-text);
  border: 1px solid var(--sic-notice-border);
  border-radius: var(--sic-control-radius);
  background: var(--sic-notice);
}

/* Responsive layout */
@media (max-width: 1080px) {
  .svg-image-settings-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .svg-image-card-list { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  body.svg-image-body {
    --sic-page-inline-gutter: 20px;
    --sic-page-padding-block: 22px;
  }
  .svg-image-panel,
  .svg-image-about { padding: 14px; }
  .svg-image-panel-header { align-items: flex-start; }
  .svg-image-panel-header,
  .svg-image-actions { width: 100%; }
  .svg-image-actions > button { flex: 1; }
  .svg-image-settings-grid,
  .svg-image-about-grid { grid-template-columns: 1fr; }
  .svg-image-conversion-card { grid-template-columns: 1fr; }
  .svg-image-preview-card {
    border-right: 0;
    border-bottom: 1px solid var(--sic-border);
  }
  .svg-image-code-input { grid-template-columns: 1fr; }
  .svg-image-code-input button { width: 100%; }
  .svg-image-convert-row .svg-image-primary-button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .svg-image-page * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}