:root {
  --bg-dark: #0f1117;
  --bg-card: #1a1d27;
  --bg-hover: #252836;
  --accent: #e94560;
  --accent-glow: rgba(233, 69, 96, 0.3);
  --gold: #f5c518;
  --gold-dark: #c9a000;
  --text: #e8e8e8;
  --text-muted: #8b8fa3;
  --success: #2ecc71;
  --border: #2a2d3a;
  --radius: 12px;
  --font-display: 'Segoe UI', system-ui, sans-serif;
  --font-body: 'Segoe UI', system-ui, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  background: var(--bg-dark);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  text-align: center;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--gold), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header p {
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.nav-links a {
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.nav-links a:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  text-decoration: none;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--gold);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: #d63851;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-hover);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--text-muted);
}

.btn-gold {
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: #1a1a1a;
}

.btn-gold:hover:not(:disabled) {
  box-shadow: 0 4px 15px rgba(245, 197, 24, 0.3);
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-danger {
  background: #c0392b;
  color: white;
}

.btn-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.status-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #555;
}

.status-dot.connected {
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
}

.category-btn {
  padding: 1rem;
  background: var(--bg-hover);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  text-align: center;
}

.category-btn:hover {
  border-color: var(--gold);
  transform: translateY(-2px);
}

.category-btn.active {
  border-color: var(--gold);
  background: rgba(245, 197, 24, 0.1);
  box-shadow: 0 0 20px rgba(245, 197, 24, 0.15);
}

.question-info {
  padding: 1rem;
  background: var(--bg-hover);
  border-radius: 8px;
  margin-bottom: 1rem;
}

.question-info .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.question-info .value {
  font-size: 1.1rem;
  margin-top: 0.25rem;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

tr:hover td {
  background: var(--bg-hover);
}

.file-upload {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}

.file-upload:hover {
  border-color: var(--accent);
  background: rgba(233, 69, 96, 0.05);
}

.file-upload input {
  display: none;
}

.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  background: var(--success);
  color: white;
  border-radius: 8px;
  font-weight: 600;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s;
  z-index: 1000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast.error {
  background: #c0392b;
}

.answer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.answer-btn {
  padding: 1rem 1.25rem;
  background: var(--bg-hover);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.answer-btn .letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--border);
  font-weight: 700;
  flex-shrink: 0;
}

.answer-btn:hover {
  border-color: var(--accent);
}

.answer-btn.selected {
  border-color: var(--accent);
  background: rgba(233, 69, 96, 0.15);
}

.answer-btn.selected .letter {
  background: var(--accent);
  color: white;
}

.answer-btn.correct {
  border-color: var(--success);
  background: rgba(46, 204, 113, 0.15);
}

.answer-btn.correct .letter {
  background: var(--success);
  color: white;
}

.answer-btn.incorrect {
  border-color: #c0392b;
  background: rgba(192, 57, 43, 0.15);
  opacity: 0.6;
}

.answer-btn.incorrect .letter {
  background: #c0392b;
  color: white;
}