* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  background: #f4f6fb;
  color: #1f2937;
}

.container {
  max-width: 760px;
  margin: 40px auto;
  padding: 0 16px;
}

h1 {
  margin-bottom: 8px;
}

.subtitle {
  margin-top: 0;
  color: #4b5563;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.04);
}

.drop-zone {
  display: block;
  border: 2px dashed #94a3b8;
  border-radius: 12px;
  padding: 26px;
  text-align: center;
  background: #f8fafc;
  cursor: pointer;
  transition: 0.2s ease;
}

.drop-zone input {
  display: none;
}

.drop-zone.dragover {
  border-color: #2563eb;
  background: #eff6ff;
}

.drop-title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
}

.drop-desc {
  margin: 8px 0 0;
  color: #6b7280;
}

.preview-wrapper {
  margin-top: 18px;
  padding: 12px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
}

.preview-wrapper img {
  display: block;
  max-width: 220px;
  max-height: 220px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  margin-top: 8px;
  background: repeating-conic-gradient(#f3f4f6 0% 25%, #e5e7eb 0% 50%) 50% / 18px 18px;
}

.label {
  margin: 0;
  font-weight: 600;
}

.meta {
  margin: 8px 0 0;
  color: #6b7280;
  font-size: 14px;
}

.options {
  margin-top: 18px;
}

.size-grid {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 8px;
}

.size-grid label {
  display: flex;
  gap: 6px;
  align-items: center;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  padding: 8px;
  border-radius: 8px;
}

.actions {
  margin-top: 20px;
}

button {
  appearance: none;
  border: 0;
  background: #2563eb;
  color: #fff;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 15px;
  cursor: pointer;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.status {
  min-height: 22px;
  margin: 12px 0 0;
  color: #1d4ed8;
}

.status.error {
  color: #b91c1c;
}

.hidden {
  display: none;
}

.shape-options {
  margin-top: 18px;
}

.shape-grid {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 8px;
}

.shape-grid label {
  display: flex;
  gap: 6px;
  align-items: center;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  padding: 8px;
  border-radius: 8px;
}

.radius-control {
  margin-top: 12px;
  padding: 12px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  background: #f8fafc;
}

.radius-control .label {
  margin-bottom: 8px;
}

#radius-slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #e5e7eb;
  outline: none;
  -webkit-appearance: none;
}

#radius-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #2563eb;
  cursor: pointer;
}

#radius-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #2563eb;
  cursor: pointer;
  border: none;
}

#crop-preview-canvas {
  display: block;
  max-width: 220px;
  max-height: 220px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  margin-top: 8px;
  background: repeating-conic-gradient(#f3f4f6 0% 25%, #e5e7eb 0% 50%) 50% / 18px 18px;
}