/* Reset & Global Base */
:root {
  --bg-app: #0b0f19;
  --bg-card: #151d30;
  --bg-card-header: #1b263f;
  --border-color: rgba(255, 255, 255, 0.06);
  --border-color-focus: #6366f1;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-link: #818cf8;
  
  --primary: #4f46e5;
  --primary-hover: #6366f1;
  --primary-light: rgba(79, 70, 229, 0.15);
  
  --secondary: #334155;
  --secondary-hover: #475569;
  
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.1);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);
  --info: #06b6d4;
  --info-bg: rgba(6, 182, 212, 0.1);
  
  --font-display: 'Outfit', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-code: 'Fira Code', 'Consolas', monospace;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 15px rgba(79, 70, 229, 0.4);
}

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

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-app);
}
::-webkit-scrollbar-thumb {
  background: #273552;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #384e78;
}

/* App Container Layout */
.app-container {
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  flex-grow: 1;
}

/* Header styling */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(21, 29, 48, 0.7) 100%);
  padding: 20px 28px;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

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

.logo-icon {
  background: linear-gradient(135deg, var(--primary) 0%, #06b6d4 100%);
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: var(--shadow-glow);
  color: #fff;
  animation: float 3s ease-in-out infinite;
}

.logo-area h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, #fff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 2px;
}

/* Status Badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 12px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}
.status-badge.idle {
  background: rgba(148, 163, 184, 0.1);
  color: var(--text-muted);
}
.status-badge.sending {
  background: rgba(79, 70, 229, 0.15);
  color: #a5b4fc;
}
.status-badge.paused {
  background: var(--warning-bg);
  color: var(--warning);
}
.status-badge.success {
  background: var(--success-bg);
  color: var(--success);
}
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}
.status-badge.sending .status-dot {
  animation: pulse-glow 1.5s infinite;
}

/* Main Workspace Grid */
.app-main {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 20px;
  align-items: start;
}

.column {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Cards Design */
.card {
  background-color: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

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

.card-header {
  background-color: var(--bg-card-header);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
}

.header-icon {
  color: var(--text-link);
  font-size: 16px;
}

.card-header h2 {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: 0.2px;
}

.card-content {
  padding: 20px;
}

/* Form Styles */
.form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
}

.form-row.flex-align-center {
  align-items: center;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-grow: 1;
}

.col-12 { width: 100%; }
.col-8 { width: 66.6%; }
.col-4 { width: 33.3%; }

label {
  font-weight: 500;
  font-size: 12px;
  color: var(--text-muted);
}

input[type="text"],
input[type="email"],
input[type="number"],
input[type="password"],
select,
textarea {
  background-color: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 13.5px;
  transition: all 0.2s ease;
  width: 100%;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="number"]:focus,
input[type="password"]:focus,
select:focus,
textarea:focus {
  border-color: var(--border-color-focus);
  outline: none;
  background-color: rgba(15, 23, 42, 0.9);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* Input with icon inside */
.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.input-wrapper input {
  padding-left: 38px;
}

.input-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  font-size: 14px;
}

.btn-icon-inside {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  transition: color 0.2s;
}
.btn-icon-inside:hover {
  color: var(--text-main);
}

/* Checkbox Style */
.checkbox-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 6px 0;
  cursor: pointer;
}
.checkbox-wrapper input[type="checkbox"] {
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}
.checkbox-wrapper label {
  cursor: pointer;
  user-select: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 13.5px;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
  color: #fff;
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.2);
}
.btn-primary:hover:not(:disabled) {
  opacity: 0.95;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
  transform: translateY(-1px);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--secondary);
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.05);
}
.btn-secondary:hover:not(:disabled) {
  background-color: var(--secondary-hover);
}

.btn-warning {
  background-color: var(--warning);
  color: #0b0f19;
}
.btn-warning:hover:not(:disabled) {
  opacity: 0.9;
}

.btn-success {
  background-color: var(--success);
  color: #fff;
}
.btn-success:hover:not(:disabled) {
  opacity: 0.9;
}

.btn-danger {
  background-color: var(--danger);
  color: #fff;
}
.btn-danger:hover:not(:disabled) {
  opacity: 0.9;
}

.btn-large {
  padding: 14px 24px;
  font-size: 15px;
  border-radius: 10px;
}

.btn-small-link {
  background: none;
  border: none;
  color: var(--text-link);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  background-color: rgba(99, 102, 241, 0.06);
}
.btn-small-link:hover:not(:disabled) {
  background-color: rgba(99, 102, 241, 0.15);
  text-decoration: underline;
}
.btn-small-link:disabled {
  color: var(--text-muted);
  opacity: 0.5;
  cursor: not-allowed;
  background: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none !important;
  transform: none !important;
}

/* SMTP configuration actions */
.smtp-actions {
  margin-top: 14px;
}
.smtp-actions button {
  width: 100%;
}

/* Contacts Tab Buttons */
.contacts-source-selector {
  display: flex;
  background-color: rgba(15, 23, 42, 0.5);
  padding: 4px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin-bottom: 16px;
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-body);
}

.tab-btn.active {
  background-color: var(--bg-card);
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

.source-panel {
  display: none;
}
.source-panel.active {
  display: block;
}

.help-text {
  color: var(--text-muted);
  font-size: 12px;
  margin-bottom: 10px;
  line-height: 1.4;
}

/* Paste Area */
#paste-contacts-input {
  height: 140px;
  resize: vertical;
  font-family: var(--font-code);
  font-size: 12px;
}

/* Drop Zone */
.file-drop-zone {
  border: 2px dashed rgba(255, 255, 255, 0.15);
  border-radius: 10px;
  padding: 24px 16px;
  text-align: center;
  background-color: rgba(15, 23, 42, 0.2);
  cursor: pointer;
  transition: all 0.2s ease;
}
.file-drop-zone:hover {
  border-color: var(--primary);
  background-color: rgba(79, 70, 229, 0.05);
}
.cloud-icon {
  font-size: 28px;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.file-drop-zone p {
  font-size: 12px;
  color: var(--text-muted);
}
.file-drop-zone p span {
  color: var(--text-link);
  font-weight: 600;
}

.file-info-badge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: #34d399;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  margin-top: 12px;
  font-weight: 500;
}
.file-info-badge button {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 14px;
}

/* Recipients Summary */
.recipients-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}
.summary-metric {
  display: flex;
  align-items: center;
  gap: 8px;
}
.metric-label {
  font-size: 12px;
  color: var(--text-muted);
}
.metric-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: #38bdf8;
}

/* Compose Email Area */
.editor-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 12px;
}
.editor-tabs .tab-btn {
  flex: none;
  padding: 8px 16px;
  border-radius: 8px 8px 0 0;
}
.editor-tabs .tab-btn.active {
  border: 1px solid var(--border-color);
  border-bottom-color: var(--bg-card);
  margin-bottom: -1px;
}

.tab-content {
  display: none;
}
.tab-content.active {
  display: block;
}

/* Rich Toolbar */
.editor-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background-color: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--border-color);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  flex-wrap: wrap;
}
.tool-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s;
  font-size: 12px;
}
.tool-btn:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}
.badge-tag {
  background-color: var(--primary-light);
  color: #a5b4fc;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 600;
  border: 1px solid rgba(79, 70, 229, 0.2);
}
.tool-btn:has(.badge-tag) {
  width: auto;
  padding: 0 4px;
}
.toolbar-divider {
  width: 1px;
  height: 16px;
  background-color: var(--border-color);
}

#email-body {
  height: 220px;
  resize: vertical;
  border-radius: 0 0 8px 8px;
}

/* Preview Box */
.preview-warning {
  background-color: var(--warning-bg);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--warning);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 11px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.preview-sandbox-header {
  background-color: rgba(15, 23, 42, 0.4);
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 11px;
  color: var(--text-muted);
}
.preview-sandbox-header strong {
  color: var(--text-main);
}
.preview-sandbox {
  background-color: #ffffff; /* White background for email render */
  border: 1px solid var(--border-color);
  border-radius: 0 0 8px 8px;
  width: 100%;
  height: 220px;
}

/* Control & Progress Dashboard */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
  background-color: rgba(15, 23, 42, 0.3);
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.setting-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.setting-item.hide {
  display: none;
}

.setting-help {
  font-size: 10.5px;
  color: var(--text-muted);
  line-height: 1.3;
}

/* Campaign Controls buttons */
.campaign-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.control-sub-group {
  display: flex;
  gap: 10px;
}
.control-sub-group button {
  flex: 1;
}
.control-sub-group button.hide {
  display: none;
}

/* Progress bar styling */
.progress-section {
  margin-bottom: 24px;
}
.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.progress-bar-container {
  background-color: rgba(15, 23, 42, 0.7);
  height: 12px;
  border-radius: 30px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.progress-bar {
  background: linear-gradient(90deg, var(--primary) 0%, #06b6d4 100%);
  height: 100%;
  border-radius: 30px;
  transition: width 0.4s ease;
  box-shadow: 0 0 8px rgba(79, 70, 229, 0.3);
}

/* Metrics Dashboard cards */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.metric-card {
  background-color: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px 6px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-val {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
}

.metric-lbl {
  font-size: 10.5px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-card.success {
  border-color: rgba(16, 185, 129, 0.15);
  color: #34d399;
}
.metric-card.danger {
  border-color: rgba(239, 68, 68, 0.15);
  color: #f87171;
}
.metric-card.info {
  border-color: rgba(6, 182, 212, 0.15);
  color: #22d3ee;
}

/* Terminal Console Panel */
.console-log {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
}

.console-header {
  background-color: rgba(15, 23, 42, 0.8);
  padding: 8px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}
.console-header span {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.console-header button {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s;
  font-size: 12px;
}
.console-header button:hover {
  color: var(--text-main);
}

.console-body {
  background-color: #05070c;
  height: 180px;
  padding: 12px;
  font-family: var(--font-code);
  font-size: 11.5px;
  line-height: 1.4;
  overflow-y: auto;
  color: #a7f3d0; /* emerald green text */
}

.console-line {
  margin-bottom: 4px;
  word-break: break-all;
}
.console-line.system {
  color: #94a3b8; /* slate */
}
.console-line.error {
  color: #fca5a5; /* red */
}
.console-line.success {
  color: #34d399; /* green */
}

/* Modal Styling */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(5, 7, 12, 0.75);
  backdrop-filter: blur(8px);
}

.modal-content {
  background-color: var(--bg-card);
  margin: 8% auto;
  width: 90%;
  max-width: 600px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: slide-down 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-header {
  padding: 16px 20px;
  background-color: var(--bg-card-header);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.modal-header h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
}
.close-modal {
  color: var(--text-muted);
  float: right;
  font-size: 24px;
  font-weight: 700;
  cursor: pointer;
  line-height: 1;
}
.close-modal:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 20px;
}

.modal-table-wrapper {
  max-height: 350px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.contacts-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 12.5px;
}

.contacts-table th, .contacts-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
}
.contacts-table th {
  background-color: rgba(15, 23, 42, 0.5);
  color: var(--text-muted);
  font-weight: 600;
  position: sticky;
  top: 0;
  z-index: 10;
}

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

.contacts-table td:first-child {
  color: var(--text-muted);
  width: 40px;
}

/* Animations */
@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-4px); }
  100% { transform: translateY(0px); }
}

@keyframes pulse-glow {
  0% {
    transform: scale(0.9);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.1);
    opacity: 1;
    box-shadow: 0 0 8px currentColor;
  }
  100% {
    transform: scale(0.9);
    opacity: 0.6;
  }
}

@keyframes slide-down {
  from {
    transform: translateY(-20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Utility Helpers */
.hide {
  display: none !important;
}

/* Responsive Scaling */
@media (max-width: 1024px) {
  .app-main {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 640px) {
  .app-container {
    padding: 12px;
  }
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .status-badge-container {
    align-self: flex-end;
  }
}

/* Archivos Adjuntos Styles */
.attachments-section {
  margin-top: 20px;
  background-color: rgba(15, 23, 42, 0.3);
  padding: 16px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
}
.attachments-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.attachments-header-row label {
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}
.attachments-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 150px;
  overflow-y: auto;
  margin-top: 8px;
}
.attachment-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  transition: all 0.2s;
}
.attachment-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: rgba(99, 102, 241, 0.3);
}
.attachment-name-box {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.attachment-name-box i {
  color: var(--text-link);
}
.attachment-size {
  color: var(--text-muted);
  font-size: 11px;
  margin-left: 6px;
}
.btn-remove-attachment {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
}
.btn-remove-attachment:hover {
  color: var(--danger);
  background-color: rgba(239, 68, 68, 0.1);
}

/* Theme Toggle Header Layout */
.header-right-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-tabs-selector {
  display: flex;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2px;
  gap: 2px;
}

.theme-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 18px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.25s ease;
}

.theme-tab-btn.active {
  background: var(--primary);
  color: #ffffff;
}

.theme-tab-btn:hover:not(.active) {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.08);
}

/* Light Theme overrides for tabs */
.light-theme .theme-tabs-selector {
  background: rgba(15, 23, 42, 0.05);
}

.light-theme .theme-tab-btn:hover:not(.active) {
  background: rgba(15, 23, 42, 0.03);
}

/* Light Theme Variables */
:root.light-theme {
  --bg-app: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-header: #f8fafc;
  --border-color: rgba(15, 23, 42, 0.08);
  --border-color-focus: #4f46e5;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-link: #4f46e5;
  
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: rgba(79, 70, 229, 0.08);
  
  --secondary: #e2e8f0;
  --secondary-hover: #cbd5e1;
  
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -1px rgba(15, 23, 42, 0.02);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.06), 0 4px 6px -2px rgba(15, 23, 42, 0.03);
  --shadow-glow: 0 0 15px rgba(79, 70, 229, 0.15);
}

/* Light Theme Element Overrides */
.light-theme input[type="text"],
.light-theme input[type="email"],
.light-theme input[type="number"],
.light-theme input[type="password"],
.light-theme select,
.light-theme textarea {
  background-color: #f8fafc;
  border-color: rgba(15, 23, 42, 0.12);
  color: #0f172a;
}

.light-theme input[type="text"]:focus,
.light-theme input[type="email"]:focus,
.light-theme input[type="number"]:focus,
.light-theme input[type="password"]:focus,
.light-theme select:focus,
.light-theme textarea:focus {
  background-color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.light-theme .logo-area h1 {
  background: linear-gradient(90deg, #0f172a 0%, #4f46e5 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.light-theme .logo-icon {
  background: linear-gradient(135deg, var(--primary) 0%, #06b6d4 100%);
}

.light-theme .status-badge {
  border-color: rgba(15, 23, 42, 0.08);
}

.light-theme .status-badge.idle {
  background: rgba(100, 116, 139, 0.1);
  color: var(--text-muted);
}

.light-theme .status-badge.sending {
  background: rgba(79, 70, 229, 0.08);
  color: #4f46e5;
}

.light-theme ::-webkit-scrollbar-thumb {
  background: #cbd5e1;
}

.light-theme ::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

.light-theme ::-webkit-scrollbar-track {
  background: var(--bg-app);
}

.light-theme .editor-toolbar {
  background-color: #f8fafc;
  border-color: rgba(15, 23, 42, 0.08);
}

.light-theme .preview-sandbox-header {
  background-color: #f8fafc;
  border-color: rgba(15, 23, 42, 0.08);
  color: #475569;
}

.light-theme .preview-sandbox {
  background-color: #ffffff;
  border-color: rgba(15, 23, 42, 0.08);
}

.light-theme .console-header {
  background-color: #f1f5f9;
  border-color: rgba(15, 23, 42, 0.08);
}

.light-theme .console-body {
  background-color: #f8fafc;
  color: #047857; /* dark emerald green for light bg readability */
  border-color: rgba(15, 23, 42, 0.08);
}

.light-theme .console-line.system {
  color: #475569;
}

.light-theme .console-line.error {
  color: #b91c1c; /* dark red */
}

.light-theme .console-line.success {
  color: #047857; /* dark green */
}

.light-theme .modal {
  background-color: rgba(15, 23, 42, 0.4);
}

.light-theme .modal-content {
  border-color: rgba(15, 23, 42, 0.1);
}

.light-theme .contacts-source-selector {
  background-color: #f1f5f9;
}

.light-theme .contacts-source-selector .tab-btn.active {
  background-color: #ffffff;
  color: var(--primary);
}

.light-theme .editor-tabs {
  border-bottom-color: rgba(15, 23, 42, 0.08);
}

.light-theme .editor-tabs .tab-btn.active {
  border-bottom-color: #ffffff;
}

.light-theme .preview-warning {
  background-color: #fef3c7;
  border-color: #fde68a;
  color: #92400e;
}

.light-theme .help-text {
  color: #475569;
}

.light-theme .setting-help {
  color: #475569;
}

.light-theme .file-drop-zone {
  background-color: #f8fafc;
  border-color: rgba(15, 23, 42, 0.12);
}

.light-theme .file-drop-zone:hover {
  background-color: rgba(79, 70, 229, 0.04);
}

.light-theme .attachments-section {
  background-color: #f8fafc;
  border-color: rgba(15, 23, 42, 0.08);
}

.light-theme .attachment-item {
  background-color: #ffffff;
  border-color: rgba(15, 23, 42, 0.08);
}

.light-theme .attachment-item:hover {
  background-color: #f1f5f9;
  border-color: rgba(79, 70, 229, 0.2);
}

.light-theme .tool-btn {
  background: #f1f5f9;
  border-color: rgba(15, 23, 42, 0.08);
  color: #475569;
}

.light-theme .tool-btn:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.light-theme .badge-tag {
  background-color: #f1f5f9;
  border-color: rgba(15, 23, 42, 0.08);
  color: #475569;
}

.light-theme .tool-btn:hover .badge-tag {
  background-color: var(--primary-light);
  color: var(--primary);
}