/* ==========================================================================
   NexusCSV Design System & Core Styles
   ========================================================================== */

/* Design Tokens & Variables */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'Fira Code', "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  /* Colors */
  --bg-app: radial-gradient(circle at top right, #171527, #0b0a12);
  --panel-bg: rgba(22, 20, 38, 0.65);
  --panel-border: rgba(255, 255, 255, 0.08);
  --panel-border-hover: rgba(99, 102, 241, 0.3);
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.4);
  
  --accent: #a855f7;
  --accent-glow: rgba(168, 85, 247, 0.3);
  
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.25);
  --danger: #ef4444;
  --danger-hover: #dc2626;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-on-primary: #ffffff;

  --card-bg: rgba(30, 27, 51, 0.4);
  --input-bg: rgba(15, 13, 26, 0.6);
  --input-border: rgba(255, 255, 255, 0.1);
  --input-focus: rgba(99, 102, 241, 0.5);

  /* Layout & Spacing */
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg-app);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.2);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Layout Containers */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1600px;
  margin: 0 auto;
  padding: 24px;
  gap: 24px;
}

/* Header Styles */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  color: var(--primary);
  filter: drop-shadow(0 0 8px var(--primary-glow));
}

.header-logo h1 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-logo .subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 24px;
}

.bmc-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #ff813f;
  color: #0b0a12;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(255, 129, 63, 0.25);
  transition: all var(--transition-normal);
}

.bmc-btn:hover {
  background: #ff945b;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(255, 129, 63, 0.4);
}

.bmc-btn i {
  width: 16px;
  height: 16px;
}

/* Main Dashboard */
.app-main {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
  flex: 1;
}

@media (max-width: 1100px) {
  .app-main {
    grid-template-columns: 1fr;
  }
}

/* Panels */
.panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.panel-card {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.panel-card:hover {
  border-color: rgba(99, 102, 241, 0.15);
}

/* Card Header */
.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.card-header i {
  color: var(--primary);
  width: 20px;
  height: 20px;
}

.card-header h4 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* Tabs System */
.tabs-header {
  display: flex;
  background: var(--input-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-md);
  padding: 4px;
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 16px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--primary);
  color: var(--text-on-primary);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.tab-btn i {
  width: 16px;
  height: 16px;
}

.tab-contents {
  position: relative;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn var(--transition-normal);
}

/* Drag & Drop Zone */
.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 2px dashed var(--input-border);
  background: var(--input-bg);
  border-radius: var(--radius-lg);
  padding: 48px 24px;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.04);
  box-shadow: 0 0 20px var(--primary-glow);
}

.dropzone-icon {
  width: 48px;
  height: 48px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  transition: transform var(--transition-normal), color var(--transition-normal);
}

.dropzone:hover .dropzone-icon, .dropzone.dragover .dropzone-icon {
  color: var(--primary);
  transform: translateY(-4px);
}

.dropzone-text h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.dropzone-text span {
  color: var(--primary);
  text-decoration: underline;
}

.dropzone-limit {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 16px;
}

/* File badge */
.file-badge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  margin-top: 12px;
  animation: slideDown var(--transition-normal);
}

.file-badge i {
  color: var(--success);
  width: 18px;
  height: 18px;
}

.file-badge span {
  flex: 1;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  margin-left: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Textarea raw paste */
.textarea-wrapper {
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  border-radius: var(--radius-lg);
  padding: 12px;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.textarea-wrapper:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--input-focus);
}

#csv-paste-area {
  width: 100%;
  height: 160px;
  background: transparent;
  border: none;
  outline: none;
  resize: vertical;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}

/* Parsing Settings */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin-top: 18px;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.setting-group label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.setting-group select {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 10px;
  font-family: var(--font-sans);
  font-size: 14px;
  outline: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.setting-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--input-focus);
}

.checkbox-group {
  justify-content: flex-end;
  padding-bottom: 2px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  font-size: 14px !important;
  text-transform: none !important;
  color: var(--text-primary) !important;
}

.checkbox-label input {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* Toggle Switches */
.toggle-switch {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 22px;
  background-color: var(--input-border);
  border-radius: 34px;
  transition: var(--transition-normal);
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  border-radius: 50%;
  transition: var(--transition-normal);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .slider {
  background-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

.toggle-switch input:checked + .slider:before {
  transform: translateX(22px);
}

.toggle-switch .label-text {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

/* Schema Mapper Section */
.schema-card {
  margin-top: 8px;
}

.schema-header-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 16px;
}

.schema-bulk-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.text-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 2px 4px;
  transition: color var(--transition-fast);
}

.text-btn:hover {
  color: var(--primary);
}

.divider {
  color: var(--text-muted);
}

/* Search bar inside mapper */
.search-filter-wrapper {
  position: relative;
  margin-bottom: 16px;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-muted);
}

.search-input {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  padding: 10px 12px 10px 38px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  outline: none;
  transition: all var(--transition-normal);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--input-focus);
}

/* Schema Table styling */
.schema-table-container {
  max-height: 380px;
  overflow-y: auto;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.15);
}

.schema-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
}

.schema-table th {
  position: sticky;
  top: 0;
  background: #1b1930;
  color: var(--text-secondary);
  font-weight: 600;
  padding: 12px 14px;
  border-bottom: 1px solid var(--panel-border);
  z-index: 1;
}

.schema-table td {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  vertical-align: middle;
}

.schema-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.schema-table tbody tr.row-excluded {
  opacity: 0.55;
  background: rgba(0, 0, 0, 0.1);
}

.col-checkbox {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
}

.col-source-name {
  font-weight: 500;
  color: var(--text-primary);
  word-break: break-all;
}

.col-path-input {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: #c7d2fe;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  outline: none;
  transition: all var(--transition-fast);
}

.col-path-input:focus {
  border-color: var(--primary);
  background: rgba(0, 0, 0, 0.4);
}

.col-type-select {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  padding: 6px;
  font-size: 12px;
  outline: none;
  cursor: pointer;
}

.col-type-select:focus {
  border-color: var(--primary);
}

/* Right Output Panel and Code Views */
.output-card {
  height: 100%;
  display: flex;
  flex-direction: column;
  min-height: 500px;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--panel-border);
}

.status-badge {
  background: rgba(99, 102, 241, 0.12);
  color: var(--primary);
  border: 1px solid rgba(99, 102, 241, 0.3);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: 12px;
}

.output-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.format-selector {
  display: flex;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.format-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  cursor: pointer;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.format-btn:hover {
  color: var(--text-primary);
}

.format-btn.active {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

/* Code Viewer Area */
.code-viewer {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  background: rgba(10, 8, 20, 0.8);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.empty-output-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex: 1;
  padding: 40px;
  color: var(--text-secondary);
}

.empty-icon {
  width: 48px;
  height: 48px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.empty-output-state h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.empty-output-state p {
  max-width: 320px;
  font-size: 13px;
  line-height: 1.5;
  margin-bottom: 24px;
}

.json-code-container {
  flex: 1;
  padding: 16px;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: #e0e7ff;
}

/* Syntax Color Elements */
.json-key { color: #a5b4fc; }     /* Lavender */
.json-string { color: #34d399; }  /* Emerald */
.json-number { color: #fbbf24; }  /* Amber */
.json-boolean { color: #f472b6; } /* Pink */
.json-null { color: #94a3b8; }    /* Muted Slate */

/* Buttons styling */
.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary);
  color: var(--text-on-primary);
  border: none;
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.primary-btn:hover {
  background: var(--primary-hover);
  box-shadow: 0 0 15px var(--primary-glow);
}

.primary-btn.sm-btn {
  padding: 8px 14px;
  font-size: 13px;
  border-radius: var(--radius-sm);
}

.btn-icon {
  width: 14px;
  height: 14px;
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 13px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.secondary-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.icon-btn-danger {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.icon-btn-danger:hover {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

/* Footer Section */
.app-footer {
  text-align: center;
  padding: 16px;
  color: var(--text-muted);
  font-size: 12px;
  border-top: 1px solid var(--panel-border);
  margin-top: auto;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Toast alert notification style */
.toast-notif {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: rgba(16, 185, 129, 0.9);
  backdrop-filter: blur(8px);
  color: white;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  font-size: 14px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
  z-index: 9999;
  animation: slideInRight var(--transition-normal);
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}