:root {
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  --surface-bg: rgba(30, 41, 59, 0.7);
  --surface-border: rgba(255, 255, 255, 0.1);
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --accent-color: #6366f1;
  --accent-hover: #818cf8;
  --danger-color: #ef4444;
  --danger-hover: #f87171;
  --success-color: #10b981;
  --table-border: rgba(255, 255, 255, 0.1);
  --table-hover: rgba(255, 255, 255, 0.05);
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  padding: 2rem;
}

.app-header {
  text-align: center;
  padding-bottom: 2rem;
}

.app-header h1 {
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  background: linear-gradient(to right, #a855f7, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.app-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.app-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.block-section {
  background: var(--surface-bg);
  border: 1px solid var(--surface-border);
  border-radius: 16px;
  padding: 1.5rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.block-section h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--surface-border);
  padding-bottom: 0.75rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

/* Forms & Inputs */
textarea {
  width: 100%;
  height: 150px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  padding: 1rem;
  color: var(--text-primary);
  font-family: monospace;
  font-size: 0.95rem;
  resize: vertical;
  margin-top: 1rem;
  margin-bottom: 1rem;
  outline: none;
  transition: border-color 0.3s ease;
}

textarea:focus { border-color: var(--accent-color); }

.controls, .output-controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.output-controls {
  justify-content: flex-end;
}

button {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  background: var(--accent-color);
  color: white;
}

button:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.secondary {
  background: transparent;
  border: 1px solid var(--surface-border);
  color: var(--text-secondary);
}

button.secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  color: white;
}

.primary-btn {
  background: linear-gradient(to right, #6366f1, #a855f7);
}
.primary-btn:hover:not(:disabled) {
  background: linear-gradient(to right, #818cf8, #c084fc);
}

.run-btn {
  width: 100%;
  margin-top: 1.5rem;
  padding: 1rem;
  font-size: 1.1rem;
}

/* Settings Grid */
.settings-grid {
  margin-top: 1rem;
}

.main-type-select {
  margin-bottom: 1.5rem;
}

.params-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  background: rgba(0, 0, 0, 0.2);
  padding: 1rem;
  border-radius: 8px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

select, input[type="number"] {
  width: 100%;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  padding: 0.6rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.3s ease;
}

select:focus, input[type="number"]:focus {
  border-color: var(--accent-color);
}

select option { background: #1e293b; }

/* Table Styling */
.table-container {
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid transparent;
  min-height: 150px;
  max-height: 400px;
  overflow-y: auto;
  margin-top: 1rem;
}

.table-container.has-data {
  border-color: var(--surface-border);
}

.empty-state {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-style: italic;
  min-height: 150px;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

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

th {
  background: rgba(30, 41, 59, 0.95);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* specific style for output table headers to differentiate from select */
#block-output th {
  text-transform: uppercase;
  color: var(--text-primary);
}

.header-select {
  width: 100%;
  min-width: 120px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--surface-border);
  border-radius: 4px;
  padding: 0.4rem;
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
}
.header-select:focus { border-color: var(--accent-color); }

td[contenteditable="true"] {
  outline: none;
  cursor: text;
  border-radius: 4px;
}
td[contenteditable="true"]:hover { background: rgba(255, 255, 255, 0.05); }
td[contenteditable="true"]:focus { background: rgba(255, 255, 255, 0.1); box-shadow: 0 0 0 2px var(--accent-color); }

/* Non-editable output table cells */
#block-output td {
  cursor: default;
}
#block-output td:hover {
  background: transparent;
}

.table-actions {
  display: flex;
  justify-content: flex-end;
}

.action-btn { flex: none; padding: 0.5rem 1rem; font-size: 0.9rem; }
.remove-btn { flex: none; padding: 0.3rem 0.6rem; font-size: 0.8rem; background: var(--danger-color); }
.remove-btn:hover { background: var(--danger-hover); }
.action-col { width: 80px; text-align: center; }

/* Scrollbars */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: rgba(0, 0, 0, 0.2); border-radius: 4px; }
::-webkit-scrollbar-thumb { background: var(--surface-border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.2); }

.status-msg {
  margin-top: 1rem;
  font-size: 0.85rem;
  text-align: center;
  color: var(--success-color);
}