:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-border: #e0e2e7;
  --color-text: #1c1f26;
  --color-muted: #6b7280;
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-danger: #dc2626;
  --color-danger-bg: #fee2e2;
  --color-success: #16a34a;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14161c;
    --color-surface: #1d2028;
    --color-border: #2c303a;
    --color-text: #e9eaee;
    --color-muted: #9aa0ab;
    --color-primary: #818cf8;
    --color-primary-hover: #6366f1;
    --color-danger: #f87171;
    --color-danger-bg: #3f1d1d;
    --color-success: #4ade80;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  padding: 40px 0 28px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.site-header h1 {
  margin: 0 0 8px;
  font-size: 2rem;
}

.subtitle {
  margin: 0;
  color: var(--color-muted);
  font-size: 1.05rem;
}

.layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding: 32px 20px 60px;
  align-items: start;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

.editor-panel,
.output-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 20px;
}

.editor-panel { position: static; }

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.panel-header h2 {
  margin: 0;
  font-size: 1.2rem;
}

.panel-actions {
  display: flex;
  gap: 8px;
}

.btn {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-hover); }

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover { border-color: var(--color-muted); }

.btn-add {
  width: 100%;
  margin-top: 8px;
  background: transparent;
  border: 2px dashed var(--color-border);
  color: var(--color-primary);
  padding: 12px;
  border-radius: var(--radius);
  font-weight: 700;
}
.btn-add:hover { border-color: var(--color-primary); }

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px;
  background: var(--color-bg);
}

.faq-item.dragging {
  opacity: 0.5;
}

.faq-item-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.drag-handle {
  cursor: grab;
  color: var(--color-muted);
  user-select: none;
}

.faq-index {
  font-weight: 700;
  color: var(--color-muted);
  font-size: 0.85rem;
  flex: 1;
}

.btn-remove {
  border: none;
  background: var(--color-danger-bg);
  color: var(--color-danger);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}
.btn-remove:hover { opacity: 0.85; }

.field-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-muted);
  margin: 8px 0 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.faq-question,
.faq-answer {
  width: 100%;
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.92rem;
  font-family: inherit;
  resize: vertical;
}

.faq-question:focus,
.faq-answer:focus {
  outline: none;
  border-color: var(--color-primary);
}

.import-area {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.import-area label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 6px;
}

.import-area textarea {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
}

.import-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.hidden { display: none !important; }

.output-code {
  background: #0d1117;
  color: #c9d1d9;
  padding: 16px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  max-height: 420px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.copy-status {
  min-height: 1.2em;
  color: var(--color-success);
  font-size: 0.85rem;
  font-weight: 600;
  margin: 8px 0 0;
}

.validation-box,
.help-box {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.validation-box h3,
.help-box h3 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.validation-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.88rem;
}

.validation-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.validation-list li.ok { color: var(--color-success); }
.validation-list li.error { color: var(--color-danger); }
.validation-list li.warn { color: #d97706; }

.help-box ol {
  margin: 0;
  padding-left: 20px;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.help-box code {
  background: var(--color-bg);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}

.help-box a {
  color: var(--color-primary);
}

.site-footer {
  text-align: center;
  padding: 24px 0;
  color: var(--color-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}