:root {
  --bg:           #1f1f1f;
  --bg-elevated:  #262626;
  --border:       #3a3a3a;
  --text:         #e8e6e3;
  --text-muted:   #a0a0a0;
  --accent:       #d97757;
  --accent-hover: #c46544;
  --preview-bg:   #141414;
  --danger:       #d96b6b;
  --warn:         #c8a960;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.55;
  min-height: 100vh;
}

a { color: var(--accent); }

.brand-bar {
  background: #181818;
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

main#root {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px 80px;
}

.loading,
.empty {
  padding: 60px 12px;
  text-align: center;
  color: var(--text-muted);
}

.banner {
  margin: 0 0 18px;
  padding: 10px 14px;
  border-radius: 8px;
  background: rgba(200, 169, 96, 0.12);
  border: 1px solid rgba(200, 169, 96, 0.45);
  color: var(--warn);
}

.notfound-card {
  padding: 36px 24px;
  text-align: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.notfound-card h2 { margin: 0 0 8px; }
.notfound-card p  { margin: 0; color: var(--text-muted); }

.question-block {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 18px;
}

.question-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.header-chip {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.question-text {
  font-size: 16px;
  font-weight: 600;
  white-space: pre-wrap;
}

.qbody {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 14px;
}

.qbody.has-preview {
  grid-template-columns: minmax(0, 1fr);
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.option-card {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  background: #222;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}

.option-card:hover,
.option-card:focus-within {
  background: #2a2a2a;
  border-color: #4d4d4d;
}

.option-card.checked {
  border-color: var(--accent);
  background: rgba(217, 119, 87, 0.10);
}

.option-card .indicator {
  margin-top: 2px;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  border: 1.5px solid #6a6a6a;
  background: #1a1a1a;
  display: flex;
  align-items: center;
  justify-content: center;
}

.option-card.radio .indicator { border-radius: 50%; }
.option-card.checkbox .indicator { border-radius: 4px; }

.option-card.checked .indicator {
  border-color: var(--accent);
  background: var(--accent);
}

.option-card.radio.checked .indicator::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #fff;
}

.option-card.checkbox.checked .indicator::after {
  content: "";
  width: 5px;
  height: 9px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translate(-1px, -1px);
}

.option-card.locked {
  cursor: default;
}

.option-card.locked:hover { background: #222; border-color: var(--border); }
.option-card.locked.checked { background: rgba(217, 119, 87, 0.10); border-color: var(--accent); }
.option-card.locked:not(.checked) { opacity: 0.55; }

.option-card .indicator-check {
  position: absolute;
  top: 10px;
  right: 12px;
  color: var(--accent);
  font-weight: 700;
}

.option-main { flex: 1; min-width: 0; }
.option-label { font-weight: 600; }
.option-desc {
  margin-top: 2px;
  color: var(--text-muted);
  font-size: 13.5px;
  white-space: pre-wrap;
  word-break: break-word;
}

.other-text-wrap {
  margin-top: 8px;
}

.other-text {
  width: 100%;
  min-height: 70px;
  padding: 10px 12px;
  background: #181818;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  resize: vertical;
}
.other-text:focus { outline: none; border-color: var(--accent); }

.preview-pane {
  background: var(--preview-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  overflow: auto;
  max-height: 480px;
}

.preview-pane pre {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  color: var(--text);
  white-space: pre;
}

.preview-empty {
  color: var(--text-muted);
  font-style: italic;
  font-size: 13px;
}

.mobile-preview {
  display: none;
  margin-top: 8px;
  background: var(--preview-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
}
.mobile-preview pre {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 12.5px;
  color: var(--text);
  white-space: pre;
  overflow-x: auto;
}

.submit-row {
  position: sticky;
  bottom: 0;
  background: linear-gradient(180deg, rgba(31,31,31,0) 0%, var(--bg) 32%, var(--bg) 100%);
  padding: 20px 0 0;
  display: flex;
  justify-content: flex-end;
}

.btn-submit {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 11px 26px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s;
}
.btn-submit:hover:not(:disabled) { background: var(--accent-hover); }
.btn-submit:disabled {
  background: #4a4a4a;
  color: #9b9b9b;
  cursor: not-allowed;
}

#toast-host {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: #333;
  color: #fff;
  padding: 10px 18px;
  border-radius: 6px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  pointer-events: auto;
  font-size: 14px;
}
.toast.error { background: #4a2222; border-color: var(--danger); }

/* Desktop two-column layout when preview present */
@media (min-width: 769px) {
  .qbody.has-preview {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .mobile-preview { display: none !important; }
}

/* Mobile */
@media (max-width: 768px) {
  .preview-pane { display: none; }
  .mobile-preview.expanded { display: block; }
}