.drop-area {
  position: relative;
  padding: 32px 24px;
  margin-bottom: 12px;
  text-align: center;
  border: 2px dashed var(--md-sys-color-outline);
  border-radius: var(--md-sys-shape-corner-large);
  background: var(--md-sys-color-surface);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

.drop-area.is-dragover {
  border-color: var(--md-sys-color-primary);
  background: var(--md-sys-color-primary-container);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--md-sys-color-primary) 18%, transparent);
}

.drop-area__icon {
  display: block;
  margin-bottom: 8px;
  font-size: 40px;
  color: var(--md-sys-color-primary);
}

.drop-area__text {
  margin: 0 0 4px;
  font-weight: 700;
  color: var(--md-sys-color-on-surface);
}

.drop-area__subtext,
.drop-area__note {
  margin: 0;
  font-size: 0.875rem;
  color: var(--md-sys-color-on-surface-variant);
}

.drop-area__note {
  margin-top: 8px;
}

.drop-area .file-input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  border: none;
  opacity: 0;
  cursor: pointer;
}

.selected-file {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin: 0 0 12px;
  padding: 12px 14px;
  border-radius: var(--md-sys-shape-corner-medium);
  background: color-mix(in srgb, var(--md-sys-color-primary) 8%, var(--md-sys-color-surface));
  border: 1px solid color-mix(in srgb, var(--md-sys-color-primary) 22%, var(--md-sys-color-outline-variant));
  font-size: 0.875rem;
  line-height: 1.45;
  color: var(--md-sys-color-on-surface-variant);
}

.selected-file__label {
  flex-shrink: 0;
  font-weight: 600;
  color: var(--md-sys-color-on-surface);
}

.selected-file__label::after {
  content: "：";
}

.selected-file__name {
  word-break: break-all;
  color: var(--md-sys-color-on-surface);
  font-weight: 500;
}

.file-input,
.sheet-select {
  width: 100%;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  background: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  font: inherit;
  font-size: 0.9375rem;
  padding: 12px 14px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.file-input:focus,
.sheet-select:focus {
  border-color: var(--md-sys-color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--md-sys-color-primary) 22%, transparent);
}

.sheet-field {
  margin-top: 16px;
}

textarea {
  width: 100%;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  background: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  font: inherit;
  font-size: 0.9375rem;
  padding: 14px 16px;
  resize: vertical;
  min-height: 220px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

textarea:focus {
  border-color: var(--md-sys-color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--md-sys-color-primary) 22%, transparent);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (max-width: 600px) {
  .drop-area {
    padding: 28px 18px;
  }

  .result-actions {
    width: 100%;
  }

  .result-actions .btn {
    flex: 1;
  }}