:root {
  --ink: #121212;
  --paper: #f7f7f5;
  --muted: #8a8a92;
  --accent: #6d5efc;
  --line: #e4e4e8;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, "Segoe UI", Inter, Roboto, sans-serif;
}

.topbar {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 32px;
  border-bottom: 1px solid var(--line);
}

.logo {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.logo span { color: var(--accent); }

.tagline {
  color: var(--muted);
  font-size: 14px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 24px;
  padding: 24px 32px 48px;
  align-items: start;
}

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
}

.panel h2 {
  margin: 0 0 6px;
  font-size: 16px;
}

.hint {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 13px;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.preset {
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 12px;
  cursor: pointer;
  color: var(--ink);
}
.preset:hover { border-color: var(--accent); color: var(--accent); }

textarea#description {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
}

.upload-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 14px 0;
}

.upload-btn {
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 13px;
  cursor: pointer;
  color: var(--muted);
}
.upload-btn:hover { border-color: var(--accent); color: var(--accent); }

.image-name { font-size: 12px; color: var(--muted); }

.cta {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 12px;
  background: var(--ink);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.cta:hover { background: var(--accent); }
.cta:disabled { opacity: 0.6; cursor: wait; }

.status {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}
.status.error { color: #c0392b; }

.json-details {
  margin-top: 16px;
  font-size: 12px;
  color: var(--muted);
}
.json-details pre {
  max-height: 260px;
  overflow: auto;
  background: #0f0f12;
  color: #9be29b;
  padding: 12px;
  border-radius: 10px;
  font-size: 11px;
  white-space: pre-wrap;
  word-break: break-word;
}

.preview-empty {
  color: var(--muted);
  font-size: 14px;
  padding: 60px 0;
  text-align: center;
}

.quiz-frame {
  border-radius: 16px;
  overflow: hidden;
  min-height: 480px;
}

/* --- rendered quiz --- */
.qf-quiz {
  min-height: 480px;
  padding: 32px;
  border-radius: var(--qf-radius, 12px);
  background: var(--qf-bg, #121212);
  color: var(--qf-fg, #fff);
  display: flex;
  flex-direction: column;
  font-family: inherit;
}

.qf-progress {
  height: 4px;
  border-radius: 4px;
  background: rgba(255,255,255,0.15);
  overflow: hidden;
  margin-bottom: 24px;
}
.qf-progress-bar {
  height: 100%;
  background: var(--qf-primary, #00ff66);
  transition: width 0.3s ease;
}

.qf-hook {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--qf-primary, #00ff66);
  margin-bottom: 8px;
}

.qf-title {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 24px;
}

.qf-question { font-size: 18px; font-weight: 600; margin-bottom: 18px; }

.qf-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: auto;
}

.qf-option {
  text-align: left;
  padding: 14px 16px;
  border-radius: var(--qf-radius, 12px);
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.04);
  color: inherit;
  font-size: 14px;
  cursor: pointer;
}
.qf-option:hover { border-color: var(--qf-primary, #00ff66); }
.qf-option.selected {
  border-color: var(--qf-primary, #00ff66);
  background: color-mix(in srgb, var(--qf-primary, #00ff66) 18%, transparent);
}

.qf-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 24px;
}

.qf-btn {
  border: none;
  border-radius: var(--qf-radius, 12px);
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: var(--qf-primary, #00ff66);
  color: #0a0a0a;
}
.qf-btn.ghost {
  background: transparent;
  color: inherit;
  border: 1px solid rgba(255,255,255,0.2);
}
.qf-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.qf-form-field {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--qf-radius, 12px);
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.05);
  color: inherit;
  font-size: 14px;
  margin-bottom: 10px;
}

.qf-success {
  text-align: center;
  padding: 24px 0;
}
.qf-success h3 { color: var(--qf-primary, #00ff66); }

.qf-debug {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px dashed rgba(255,255,255,0.15);
  font-size: 11px;
  color: rgba(255,255,255,0.5);
  text-align: left;
  white-space: pre-wrap;
  word-break: break-word;
}