:root {
  --otg-background: #ffffff;
  --otg-foreground: #0f172a; /* slate-900 */
  --otg-muted: #f1f5f9;      /* slate-100 */
  --otg-muted-fg: #64748b;   /* slate-500 */
  --otg-primary: #2563eb;    /* blue-600 */
  --otg-primary-fg: #ffffff;
  --otg-border: #e2e8f0;     /* slate-200 */
  --otg-radius: 8px;
  --otg-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --otg-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

.otg-wrapper {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--otg-foreground);
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.5;
  box-sizing: border-box;
}

.otg-wrapper * {
  box-sizing: border-box;
}

/* Header */
.otg-header {
  text-align: center;
  margin-bottom: 3rem;
}

.otg-icon-wrapper {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  background-color: rgba(37, 99, 235, 0.1);
  border-radius: 9999px;
  margin-bottom: 1.5rem;
  color: var(--otg-primary);
}

.otg-header h2 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin: 0 0 1rem 0;
  color: var(--otg-foreground);
}

.otg-header p {
  font-size: 1.125rem;
  color: var(--otg-muted-fg);
  margin: 0;
}

/* Main Card */
.otg-card {
  background: var(--otg-background);
  border-radius: var(--otg-radius);
  border: 1px solid var(--otg-border);
  box-shadow: var(--otg-shadow-lg);
  padding: 2rem;
  margin-bottom: 3rem;
}

.otg-input-group, .otg-result-group {
  position: relative;
}

.otg-input-group label, .otg-result-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--otg-muted-fg);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.otg-result-group label {
  text-align: right;
}

/* Input */
#otg-input {
  width: 100%;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 2.25rem;
  font-weight: 500;
  padding: 1.5rem 1rem;
  border: 2px solid var(--otg-border);
  border-radius: var(--otg-radius);
  box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  transition: all 0.2s;
  outline: none;
}

#otg-input:focus {
  border-color: var(--otg-primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

/* Swap Button */
.otg-swap-container {
  display: flex;
  justify-content: center;
  margin: -1rem 0;
  position: relative;
  z-index: 10;
}

#otg-swap-btn {
  background: var(--otg-background);
  border: 2px solid var(--otg-border);
  color: var(--otg-foreground);
  width: 48px;
  height: 48px;
  border-radius: 9999px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  padding: 0;
}

#otg-swap-btn:hover {
  border-color: var(--otg-primary);
  color: var(--otg-primary);
  background-color: var(--otg-muted);
}

/* Result Box */
.otg-result-group .otg-result-display {
  background: rgba(37, 99, 235, 0.05);
  border: 1px solid var(--otg-border);
  border-radius: var(--otg-radius);
  padding: 1.5rem;
  text-align: right;
}

#otg-result-value {
  display: block;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 3rem;
  font-weight: 700;
  color: var(--otg-primary);
  line-height: 1.1;
  word-break: break-all;
}

.otg-result-subtext {
  text-align: right;
  margin-top: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  color: var(--otg-muted-fg);
}

/* Grid Layout for Info */
.otg-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

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

.otg-info-card {
  background: var(--otg-background);
  border: 1px solid var(--otg-border);
  border-radius: var(--otg-radius);
  padding: 1.5rem;
}

.otg-card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.otg-card-title h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
}

.otg-content p {
  color: var(--otg-muted-fg);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.otg-formula-box {
  background: var(--otg-muted);
  border: 1px solid var(--otg-border);
  padding: 1rem;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

.otg-formula-box strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--otg-foreground);
}

.otg-formula-box p {
  margin: 0;
}

/* Table */
.otg-table-wrapper {
  max-height: 400px;
  overflow-y: auto;
}

.otg-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.otg-table th {
  text-align: left;
  padding: 0.75rem;
  border-bottom: 1px solid var(--otg-border);
  color: var(--otg-muted-fg);
  font-weight: 500;
}

.otg-table td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--otg-border);
  font-family: 'JetBrains Mono', monospace;
}

.otg-table .tr {
  text-align: right;
  color: var(--otg-muted-fg);
}

.otg-table tr:hover td {
  background-color: var(--otg-muted);
}