:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --panel: #ffffff;
  --primary: #2948ff;
  --accent: #00c2a8;
  --text: #1b2233;
  --muted: #5f6b7a;
  --danger: #d83a3a;
  --success: #2f9e44;
  --border: #dfe5ee;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.top-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
}

.tagline {
  font-size: 13px;
  color: var(--muted);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.controls label,
.settings label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
}

.controls select {
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
}

.toggle {
  display: flex !important;
  align-items: center;
  gap: 8px;
  font-size: 13px !important;
  color: var(--text) !important;
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 1.4fr) minmax(280px, 1.2fr) minmax(220px, 0.8fr) minmax(220px, 0.8fr);
  gap: 20px;
  padding: 24px;
}

.panel {
  background: var(--panel);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

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

.panel-header h1,
.panel-header h2 {
  margin: 0;
  font-size: 18px;
}

.pill {
  padding: 4px 10px;
  border-radius: 999px;
  background: #eef2ff;
  color: #2b3b94;
  font-size: 12px;
  margin-left: 6px;
}

.question {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 8px;
}

.question-detail {
  color: var(--muted);
  line-height: 1.5;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

button {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 600;
  background: #f1f4ff;
  color: var(--text);
}

button.primary {
  background: var(--primary);
  color: white;
}

button.ghost {
  background: transparent;
  border-color: var(--border);
}

.feedback {
  margin-top: 16px;
  display: grid;
  gap: 6px;
}

.feedback-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 14px;
  border: 1px solid var(--border);
}

.feedback-item.success {
  border-color: rgba(47, 158, 68, 0.4);
  background: rgba(47, 158, 68, 0.08);
}

.feedback-item.error {
  border-color: rgba(216, 58, 58, 0.4);
  background: rgba(216, 58, 58, 0.08);
}

.form {
  display: grid;
  gap: 12px;
}

.field {
  display: grid;
  gap: 6px;
}

.field label {
  font-size: 12px;
  color: var(--muted);
}

.field input,
.field textarea,
.field select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 14px;
  background: #fbfcff;
}

.field input[disabled] {
  background: #f0f3f8;
  color: var(--muted);
}

.advanced {
  margin-top: 12px;
  border-top: 1px dashed var(--border);
  padding-top: 12px;
}

.hidden {
  display: none;
}

.toggle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}

.stats {
  display: grid;
  gap: 10px;
  font-size: 14px;
  color: var(--muted);
}

.stats strong {
  color: var(--text);
}

.muted {
  color: var(--muted);
  font-size: 13px;
}

.shortcuts {
  margin: 0;
  padding-left: 16px;
  color: var(--muted);
}

.hint-panel,
.explanation {
  margin-top: 12px;
  background: #f8fafc;
  padding: 12px;
  border-radius: 12px;
  border: 1px dashed var(--border);
  font-size: 14px;
  color: var(--muted);
}

.footer {
  padding: 16px 24px 24px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 1200px) {
  .layout {
    grid-template-columns: 1fr 1fr;
  }
}

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

  .top-bar {
    position: static;
  }
}