:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #6b7280;
  --color-border: #d1d5db;
  --color-primary: #1a73e8;
  --color-primary-text: #ffffff;
  --color-danger: #d93025;
  --radius: 6px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.page-header h1 {
  font-size: 24px;
  margin: 0;
}

.subtitle {
  color: var(--color-muted);
  font-size: 14px;
  margin: 0 0 16px;
}

.input {
  width: 100%;
  padding: 10px 12px;
  font-size: 15px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
}

.input:focus,
.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.btn {
  min-height: 44px;
  padding: 0 16px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}

.btn:hover {
  background: #f0f1f3;
}

.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-text);
}
.btn-primary:hover {
  filter: brightness(0.95);
}

.btn-danger {
  background: var(--color-danger);
  border-color: var(--color-danger);
  color: #fff;
}

.btn-row {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}
.btn-row .btn {
  flex: 1;
}

/* Layout: form + live JSON preview */
.layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 16px;
}
@media (min-width: 860px) {
  .layout {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
  .preview-panel {
    position: sticky;
    top: 16px;
  }
}

.edit-form {
  display: flex;
  flex-direction: column;
}
.field {
  display: flex;
  flex-direction: column;
  margin-bottom: 8px;
}
.field-label {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin-bottom: 4px;
}
.field-hint {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
}
.image-preview {
  margin-top: 6px;
  max-width: 100%;
  max-height: 160px;
  object-fit: contain;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.preview-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px;
}
.preview-label {
  font-size: 12px;
  color: var(--color-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.preview {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: monospace;
  font-size: 13px;
  max-height: 70vh;
  overflow: auto;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
}
.modal-card {
  background: var(--color-surface);
  color: var(--color-text);
  width: min(90vw, 420px);
  max-height: 80vh;
  overflow-y: auto;
  border-radius: var(--radius);
  padding: 20px;
}
.modal-card h3 {
  margin: 0 0 12px;
  font-size: 18px;
}
.modal-card p {
  margin: 0 0 16px;
  color: var(--color-muted);
}
.modal-option {
  display: block;
  width: 100%;
  text-align: left;
  padding: 12px;
  margin-bottom: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 14px;
}
.modal-option:hover {
  background: #f0f1f3;
}
.modal-cancel {
  display: block;
  width: 100%;
  text-align: center;
  padding: 10px;
  margin-top: 8px;
  background: transparent;
  border: none;
  color: var(--color-muted);
  cursor: pointer;
}
.modal-textarea {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px;
  font-family: monospace;
  font-size: 13px;
  resize: vertical;
}
.modal-btn-row {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 12px;
}
.modal-btn-row button {
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
}
.modal-btn-row button:last-child {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 16px);
  background: #323232;
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  opacity: 0;
  transition:
    opacity 0.2s,
    transform 0.2s;
  z-index: 200;
  max-width: 90vw;
}
.toast-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}
.toast-error {
  background: var(--color-danger);
}