:root {
  --bg: #07111c;
  --bg-alt: #0d1b2a;
  --panel: rgba(15, 28, 43, 0.92);
  --panel-strong: #102235;
  --border: rgba(147, 197, 253, 0.18);
  --text: #e6eef7;
  --muted: #8ca3bd;
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 24px 60px rgba(3, 10, 18, 0.45);
  --radius: 20px;
  --mono: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
  --sans: "Segoe UI", "Helvetica Neue", "Arial", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.14), transparent 28%),
    radial-gradient(circle at top right, rgba(14, 165, 233, 0.08), transparent 20%),
    linear-gradient(160deg, #030b14 0%, #07111c 45%, #0a1626 100%);
}

.page-shell {
  max-width: 1400px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.topbar,
.layout {
  display: grid;
  gap: 24px;
}

.topbar {
  grid-template-columns: 1.4fr 1fr;
  align-items: start;
  margin-bottom: 24px;
}

.topbar-actions {
  display: grid;
  gap: 14px;
  justify-items: end;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.25rem);
  letter-spacing: -0.04em;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
}

.scoreboard,
.feedback-grid,
.button-row,
.badges {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.scoreboard {
  justify-content: flex-end;
}

.stat-card,
.badge,
.score-pill,
.topic-bar,
.feedback-box,
.question-card,
.panel,
.answer-form textarea,
.ghost-button,
.primary-button,
.secondary-button {
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.stat-card,
.badge,
.score-pill,
.topic-bar,
.feedback-box,
.question-card,
.panel {
  background: var(--panel);
  backdrop-filter: blur(14px);
}

.stat-card {
  min-width: 110px;
  padding: 14px 16px;
  border-radius: 16px;
}

.stat-label {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  margin-bottom: 8px;
}

.layout {
  grid-template-columns: minmax(0, 2fr) minmax(300px, 0.95fr);
}

.panel {
  border-radius: var(--radius);
  padding: 24px;
}

.main-panel {
  display: grid;
  gap: 18px;
}

.panel-header,
.feedback-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.question-card {
  padding: 28px;
  border-radius: 18px;
}

.question-text {
  font-size: 1.32rem;
  line-height: 1.6;
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--text);
  font-size: 0.85rem;
  text-transform: capitalize;
}

.badge.subtle {
  color: var(--muted);
}

.answer-form {
  display: grid;
  gap: 10px;
}

.answer-form label {
  font-weight: 600;
}

.answer-form textarea {
  width: 100%;
  border-radius: 18px;
  padding: 18px;
  resize: vertical;
  font: inherit;
  color: var(--text);
  background: rgba(6, 16, 27, 0.92);
}

.answer-form textarea:focus {
  outline: 2px solid rgba(125, 211, 252, 0.55);
  border-color: rgba(125, 211, 252, 0.4);
}

button {
  cursor: pointer;
  font: inherit;
}

.ghost-button,
.primary-button,
.secondary-button {
  border-radius: 999px;
  padding: 12px 18px;
  transition: transform 120ms ease, opacity 120ms ease, background 120ms ease;
}

.ghost-button,
.secondary-button {
  background: rgba(17, 33, 49, 0.9);
  color: var(--text);
}

.primary-button {
  background: linear-gradient(135deg, var(--accent-strong), #0ea5e9);
  color: #032033;
  font-weight: 700;
}

.ghost-button:hover,
.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-1px);
}

.feedback-panel {
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

.feedback-box {
  border-radius: 18px;
  padding: 16px;
  flex: 1 1 240px;
}

.feedback-box.full-width {
  flex-basis: 100%;
}

.feedback-box h3,
.reference-panel h3 {
  margin-top: 0;
}

.score-pill {
  border-radius: 999px;
  padding: 12px 16px;
  font-weight: 700;
}

.score-pill.good {
  color: #07160c;
  background: rgba(34, 197, 94, 0.92);
}

.score-pill.warn {
  color: #231300;
  background: rgba(245, 158, 11, 0.92);
}

.score-pill.bad {
  color: #24090a;
  background: rgba(239, 68, 68, 0.92);
}

.score-pill.neutral {
  color: var(--text);
}

.reference-panel {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.reference-answer {
  white-space: pre-wrap;
  line-height: 1.55;
  font-family: var(--mono);
  background: rgba(6, 16, 27, 0.9);
  border-radius: 16px;
  padding: 16px;
  overflow-x: auto;
}

.source-list,
.plain-list {
  margin: 0;
  padding-left: 18px;
}

.source-list li,
.plain-list li {
  margin-bottom: 10px;
  color: var(--muted);
}

.topic-bars {
  display: grid;
  gap: 12px;
}

.topic-bar {
  border-radius: 16px;
  padding: 14px;
}

.topic-bar header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  color: var(--text);
}

.topic-bar-track {
  width: 100%;
  height: 10px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
}

.topic-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #0ea5e9, #7dd3fc);
  border-radius: 999px;
}

.history-list li strong {
  color: var(--text);
}

.hidden {
  display: none !important;
}

@media (max-width: 980px) {
  .topbar-actions,
  .scoreboard {
    justify-items: start;
    justify-content: flex-start;
  }
}

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

  .scoreboard {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .page-shell {
    padding: 20px 16px 32px;
  }

  .panel {
    padding: 18px;
  }

  .question-text {
    font-size: 1.1rem;
  }
}