.ai-demo-section {
  background: #eef7f3;
  border-top: 1px solid #cddfd8;
  border-bottom: 1px solid #cddfd8;
}

.ai-demo-shell {
  --ai-panel: #ffffff;
  --ai-soft: #f6faf8;
  --ai-accent: #2f5f53;
  --ai-accent-dark: #1e3a34;
  --ai-warning: #76531b;
}

.ai-demo-intro {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 22px;
}

.ai-engine-note {
  min-height: 100%;
  padding: 18px 20px;
  border: 1px solid #cddfd8;
  border-radius: 8px;
  background: rgba(255, 255, 255, .78);
}

.ai-engine-note.cloud {
  border-color: #d9d5e8;
  background: #f8f6fc;
}

.ai-engine-note strong {
  display: block;
  margin-bottom: 5px;
  color: var(--ink);
  font-size: 16px;
}

.ai-engine-note p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.ai-demo-form {
  display: grid;
  gap: 18px;
}

.ai-engine-fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.ai-engine-fieldset legend {
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 900;
}

.ai-engine-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.ai-engine-option {
  position: relative;
  display: block;
  min-width: 0;
}

.ai-engine-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.ai-engine-card {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 13px;
  min-height: 126px;
  padding: 17px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--ai-panel);
  cursor: pointer;
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

.ai-engine-card:hover {
  border-color: #9ebcb2;
  transform: translateY(-1px);
}

.ai-engine-option input:focus-visible + .ai-engine-card {
  outline: 3px solid rgba(47, 95, 83, .24);
  outline-offset: 2px;
}

.ai-engine-option input:checked + .ai-engine-card {
  border-color: var(--ai-accent);
  box-shadow: 0 0 0 2px rgba(47, 95, 83, .13), 0 12px 28px rgba(24, 33, 31, .08);
}

.ai-engine-option input:disabled + .ai-engine-card {
  cursor: not-allowed;
  filter: grayscale(.35);
  opacity: .58;
  transform: none;
}

.ai-engine-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--ai-accent);
  font-size: 12px;
  font-weight: 900;
}

.ai-engine-option.cloud .ai-engine-icon {
  background: #66548e;
}

.ai-engine-name {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 900;
}

.ai-engine-badge {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 7px;
  padding: 2px 7px;
  border-radius: 4px;
  color: var(--ai-accent);
  background: #e8f3ef;
  font-size: 10px;
  font-weight: 900;
}

.ai-engine-option.cloud .ai-engine-badge {
  color: #59467e;
  background: #eee9f8;
}

.ai-engine-copy {
  display: block;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.ai-mode-notice {
  margin: 10px 0 0;
  padding: 10px 12px;
  border-left: 3px solid var(--ai-accent);
  border-radius: 4px;
  color: #42625a;
  background: rgba(255, 255, 255, .7);
  font-size: 13px;
}

.ai-mode-notice.cloud {
  color: #57466f;
  border-left-color: #66548e;
  background: #f8f6fc;
}

.ai-workbench {
  display: grid;
  grid-template-columns: minmax(300px, .8fr) minmax(0, 1.2fr);
  gap: 18px;
  align-items: stretch;
}

.ai-upload-panel,
.ai-preview-panel {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--ai-panel);
  box-shadow: 0 14px 34px rgba(24, 33, 31, .07);
}

.ai-panel-heading {
  margin-bottom: 13px;
}

.ai-panel-heading strong {
  display: block;
  color: var(--ink);
  font-size: 18px;
}

.ai-panel-heading span {
  color: var(--muted);
  font-size: 13px;
}

.ai-file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

.ai-dropzone {
  padding: 22px 18px;
  border: 2px dashed #abc1b9;
  border-radius: 8px;
  background: var(--ai-soft);
  text-align: center;
  transition: border-color .18s ease, background .18s ease;
}

.ai-dropzone.is-dragging {
  border-color: var(--ai-accent);
  background: #e8f3ef;
}

.ai-dropzone-icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  margin: 0 auto 10px;
  border-radius: 50%;
  color: var(--ai-accent);
  background: #e1eee9;
  font-size: 23px;
  font-weight: 900;
}

.ai-dropzone strong {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-size: 16px;
}

.ai-dropzone p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 13px;
}

.ai-button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.ai-dropzone .ai-button-row {
  justify-content: center;
}

.ai-dropzone .ai-sample-credit {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 11px;
}

.ai-sample-credit a {
  color: var(--ai-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.ai-button,
.ai-file-button {
  appearance: none;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 13px;
  border: 1px solid var(--ai-accent);
  border-radius: 6px;
  color: var(--ai-accent);
  background: #fff;
  font: inherit;
  font-size: 13px;
  font-weight: 900;
  line-height: 1.25;
  cursor: pointer;
}

.ai-button:hover,
.ai-file-button:hover {
  background: #f1f7f4;
}

.ai-button:focus-visible,
.ai-file-button:focus-visible {
  outline: 3px solid rgba(47, 95, 83, .24);
  outline-offset: 2px;
}

.ai-button.primary {
  color: #fff;
  border-color: var(--ai-accent);
  background: var(--ai-accent);
}

.ai-button.primary:hover {
  background: var(--ai-accent-dark);
}

.ai-button.subtle {
  color: var(--muted);
  border-color: var(--line);
}

.ai-button:disabled,
.ai-file-button:disabled,
.ai-file-button[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: .48;
}

.ai-source-summary {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  margin-top: 13px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
}

.ai-source-summary img {
  width: 62px;
  height: 62px;
  object-fit: cover;
  border-radius: 5px;
  background: var(--gray-100);
}

.ai-source-summary strong,
.ai-source-summary span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ai-source-summary strong {
  color: var(--ink);
  font-size: 13px;
}

.ai-source-summary span {
  color: var(--muted);
  font-size: 12px;
}

.ai-action-bar {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.ai-action-bar .ai-button.primary {
  width: 100%;
  min-height: 46px;
}

.ai-status {
  min-height: 22px;
  margin-top: 12px;
  padding-left: 26px;
  position: relative;
  color: var(--muted);
  font-size: 13px;
}

.ai-status::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 3px;
  width: 12px;
  height: 12px;
  border: 2px solid #c8d7d1;
  border-top-color: var(--ai-accent);
  border-radius: 50%;
  opacity: 0;
}

.ai-demo-form[aria-busy="true"] .ai-status::before {
  opacity: 1;
  animation: ai-spin .8s linear infinite;
}

.ai-error {
  margin-top: 10px;
  padding: 10px 12px;
  border-left: 3px solid #b42318;
  border-radius: 4px;
  color: #8a1c13;
  background: #fff2f0;
  font-size: 13px;
  font-weight: 700;
}

.ai-preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.ai-preview-figure {
  min-width: 0;
  margin: 0;
}

.ai-preview-figure figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 7px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 900;
}

.ai-preview-frame {
  position: relative;
  min-height: 260px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #f3f5f4;
}

.ai-result-frame[data-background="transparent"] {
  background-color: #fff;
  background-image:
    linear-gradient(45deg, #dfe5e2 25%, transparent 25%),
    linear-gradient(-45deg, #dfe5e2 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #dfe5e2 75%),
    linear-gradient(-45deg, transparent 75%, #dfe5e2 75%);
  background-size: 22px 22px;
  background-position: 0 0, 0 11px, 11px -11px, -11px 0;
}

.ai-result-frame[data-background="white"] { background: #fff; }
.ai-result-frame[data-background="gray"] { background: #d9dfdc; }
.ai-result-frame[data-background="green"] { background: #315f54; }

.ai-preview-image {
  width: 100%;
  height: 100%;
  max-height: 360px;
  object-fit: contain;
}

.ai-preview-placeholder {
  max-width: 210px;
  padding: 24px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.ai-result-meta {
  min-height: 42px;
  margin-top: 10px;
  padding: 9px 11px;
  border-radius: 6px;
  color: var(--muted);
  background: var(--gray-100);
  font-size: 12px;
}

.ai-background-control {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin-top: 13px;
}

.ai-background-control > span {
  margin-right: 3px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.ai-bg-button {
  width: 30px;
  height: 30px;
  padding: 0;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px #b8c5c0;
  cursor: pointer;
}

.ai-bg-button[data-bg="transparent"] {
  background-color: #fff;
  background-image: linear-gradient(45deg, #cbd4d0 25%, transparent 25%), linear-gradient(-45deg, #cbd4d0 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #cbd4d0 75%), linear-gradient(-45deg, transparent 75%, #cbd4d0 75%);
  background-size: 10px 10px;
  background-position: 0 0, 0 5px, 5px -5px, -5px 0;
}

.ai-bg-button[data-bg="white"] { background: #fff; }
.ai-bg-button[data-bg="gray"] { background: #d9dfdc; }
.ai-bg-button[data-bg="green"] { background: #315f54; }

.ai-bg-button[aria-pressed="true"] {
  box-shadow: 0 0 0 3px rgba(47, 95, 83, .35);
}

.ai-bg-button:focus-visible {
  outline: 3px solid rgba(47, 95, 83, .32);
  outline-offset: 3px;
}

.ai-bg-button:disabled {
  cursor: not-allowed;
  opacity: .42;
}

.ai-result-actions {
  justify-content: flex-end;
  margin-top: 14px;
}

.ai-privacy-note {
  margin: 0;
  padding: 14px 16px;
  border: 1px solid #ead7a5;
  border-radius: 6px;
  color: var(--ai-warning);
  background: #fff9e9;
  font-size: 13px;
}

.ai-sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@keyframes ai-spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 860px) {
  .ai-demo-intro,
  .ai-engine-options,
  .ai-workbench,
  .ai-preview-grid {
    grid-template-columns: 1fr;
  }

  .ai-engine-card { min-height: 0; }
  .ai-preview-frame { min-height: 240px; }
  .ai-result-actions { justify-content: stretch; }
  .ai-result-actions .ai-button { flex: 1 1 130px; }
}

@media (prefers-reduced-motion: reduce) {
  .ai-engine-card,
  .ai-dropzone { transition: none; }
  .ai-demo-form[aria-busy="true"] .ai-status::before { animation-duration: 1.8s; }
}