.tool-hero {
  text-align: center;
  padding: 2.2rem 0 1rem;
}
.tool-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 0.75rem;
  background: linear-gradient(90deg, #00dbde, #fc00ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.tool-hero p {
  color: var(--text-color);
  opacity: 0.9;
  margin: 0;
}
.tool-shell {
  max-width: 1100px;
  margin: 0 auto;
  background: var(--card-bg);
  border: 1px solid var(--header-border);
  border-radius: 16px;
  padding: 28px 28px 20px;
  backdrop-filter: blur(8px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
}
.main-row {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: 24px;
  align-items: stretch;
}
.panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}
.upload-box {
  border: 2px dashed var(--header-border);
  border-radius: 12px;
  padding: 24px 16px;
  text-align: center;
  background: rgba(255,255,255,0.03);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.upload-box:hover {
  border-color: rgba(0, 219, 222, 0.9);
}
.ctrl-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-items: end;
}
.form-item {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}
label {
  font-size: 14px;
  color: var(--text-color);
  opacity: 0.8;
  line-height: 1.4;
}
input[type="text"], input[type="number"], select {
  width: 100%;
  box-sizing: border-box;
  padding: 9px 11px;
  border: 1px solid var(--input-border);
  border-radius: 8px;
  background: var(--input-bg);
  color: var(--input-text);
  font-size: 15px;
  min-height: 42px;
}
input[type="file"] {
  display: none;
}
.file-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--input-border);
  background: linear-gradient(90deg, rgba(0,219,222,0.08), rgba(252,0,255,0.06));
  color: var(--text-color);
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 6px 14px rgba(0,0,0,0.04);
}
.file-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.06);
}
#selectedFileName {
  display: inline-block;
  margin-left: 12px;
  font-size: 13px;
  color: var(--footer-text);
  vertical-align: middle;
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.btn-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.quick-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 6px;
}
.preset-block {
  border: 1px solid var(--header-border);
  border-radius: 12px;
  background: rgba(255,255,255,0.02);
  padding: 10px 12px;
}
.preset-label {
  font-size: 12px;
  color: var(--footer-text);
  margin-bottom: 8px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.preset-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.preset-group.compact {
  gap: 6px;
  margin-top: 6px;
}
.preset-group.compact .preset-btn {
  flex: none;
  min-width: 64px;
  padding: 6px 8px;
  font-size: 12px;
}
.preset-btn {
  flex: 1 1 calc(50% - 8px);
  min-width: 86px;
  border: 1px solid var(--header-border);
  background: transparent;
  color: var(--text-color);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.preset-btn.is-active {
  background: linear-gradient(90deg, #00dbde, #fc00ff);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 6px 16px rgba(0, 219, 222, 0.2);
}
.color-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.color-row input[type="color"] {
  width: 42px;
  height: 36px;
  border: none;
  background: transparent;
  padding: 0;
  cursor: pointer;
}
.color-text {
  font-size: 12px;
  color: var(--text-color);
  opacity: 0.8;
}
.btn-refresh,
.btn-run,
.btn-img {
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}
.btn-refresh {
  background: #6c757d;
  color: #fff;
}
.btn-run {
  background: linear-gradient(90deg, #00dbde, #fc00ff);
  color: #fff;
}
.btn-img {
  background: linear-gradient(90deg, #28c76f, #2ba977);
  color: #fff;
}
.btn-refresh:hover,
.btn-run:hover,
.btn-img:hover {
  transform: translateY(-1px);
}
button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}
#status {
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.6;
}
.info {
  background: rgba(59, 125, 221, 0.12);
  color: #1d5bab;
}
[data-theme="dark"] .info {
  color: #cfe3ff;
}
.err {
  background: rgba(221, 68, 68, 0.12);
  color: #b32424;
}
[data-theme="dark"] .err {
  color: #ffb7b7;
}
.preview-wrap {
  border: 1px solid var(--header-border);
  border-radius: 12px;
  padding: 12px;
  background: rgba(0,0,0,0.04);
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}
[data-theme="dark"] .preview-wrap {
  background: rgba(255,255,255,0.04);
}
#previewCanvas {
  max-width: 100%;
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.2);
}
.preview-tip {
  color: var(--footer-text);
  text-align: center;
  padding: 0 16px;
}
.hint {
  margin-top: 8px;
  font-size: 13px;
  color: var(--footer-text);
  line-height: 1.8;
}
@media (max-width: 768px) {
  .main-row { grid-template-columns: 1fr; }
  .ctrl-row { grid-template-columns: 1fr; }
  .tool-shell { padding: 18px 16px; }
  .upload-box { padding: 18px 14px; }
}