:root {
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --secondary-color: #475569;
  --secondary-hover: #334155;
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --border-color: #334155;
  --text-color: #f8fafc;
  --text-muted: #94a3b8;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --font-family: 'Outfit', sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.5;
  padding: 0;
  margin: 0;
  min-height: 100vh;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Header */
.app-header {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo i {
  font-size: 1.75rem;
  color: var(--primary-color);
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.logo h1 span {
  color: var(--primary-color);
}

/* Main Layout */
.main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

.content-area {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Cards & Steps */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  transition: transform 0.2s, opacity 0.2s, border-color 0.2s;
}

.step-card {
  opacity: 0.5;
  pointer-events: none;
}

.step-card.active {
  opacity: 1;
  pointer-events: all;
  border-color: rgba(99, 102, 241, 0.4);
}

.step-card.disabled {
  opacity: 0.35;
  pointer-events: none;
  filter: grayscale(80%);
}

.step-num {
  position: absolute;
  top: -15px;
  left: 30px;
  background-color: var(--primary-color);
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.6);
}

.card h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.step-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
  font-family: var(--font-family);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  background-color: var(--border-color);
  color: var(--text-muted);
  cursor: not-allowed;
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: var(--text-color);
}

.btn-secondary:hover {
  background-color: var(--secondary-hover);
}

.btn-full {
  width: 100%;
  padding: 0.75rem;
  margin-top: 1rem;
}

.btn-large {
  padding: 0.85rem 2rem;
  font-size: 1.05rem;
  border-radius: 12px;
}

.btn-close {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  background-color: rgba(30, 41, 59, 0.5);
  transition: border-color 0.2s, background-color 0.2s;
}

.drop-zone:hover {
  border-color: var(--primary-color);
  background-color: rgba(99, 102, 241, 0.05);
}

.drop-icon {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.drop-zone p {
  font-size: 1rem;
  color: var(--text-muted);
}

.drop-zone p span {
  color: var(--primary-color);
  font-weight: 500;
}

.file-info {
  margin-top: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background-color: rgba(99, 102, 241, 0.1);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.file-name {
  font-weight: 500;
  color: var(--text-color);
}

.btn-remove {
  background: none;
  border: none;
  color: var(--danger-color);
  cursor: pointer;
  font-size: 1.1rem;
}

/* Form layouts */
.grid-2-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.config-block {
  background-color: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
}

.config-block h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group-row {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.sub-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.form-select, .form-input, .form-textarea {
  width: 100%;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  border-radius: 8px;
  padding: 0.6rem 0.8rem;
  font-family: var(--font-family);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-select:focus, .form-input:focus, .form-textarea:focus {
  border-color: var(--primary-color);
}

.form-textarea {
  resize: vertical;
}

.help-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: auto;
  margin-bottom: 1.25rem;
}

.checkbox-group input {
  width: 18px;
  height: 18px;
  accent-color: var(--primary-color);
}

.checkbox-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  max-height: 300px;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  background-color: rgba(30, 41, 59, 0.4);
  padding: 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.checkbox-item input {
  accent-color: var(--primary-color);
}

/* Sidebar configuration */
.config-sidebar {
  position: fixed;
  top: 0;
  right: -360px;
  width: 360px;
  height: 100vh;
  background-color: var(--card-bg);
  border-left: 1px solid var(--border-color);
  box-shadow: -5px 0 25px rgba(0,0,0,0.5);
  transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.config-sidebar.open {
  right: 0;
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-body {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
}

.divider {
  border: 0;
  height: 1px;
  background-color: var(--border-color);
  margin: 1.5rem 0;
}

.test-result {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
}

.test-result.success {
  color: var(--success-color);
}

.test-result.error {
  color: var(--danger-color);
}

/* Step 4 Layout: Preview */
.preview-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.5rem;
  height: 480px;
  margin-bottom: 1.5rem;
}

.emails-list-container {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  background-color: rgba(15, 23, 42, 0.3);
  overflow: hidden;
}

.emails-list-container h3 {
  font-size: 0.95rem;
  padding: 1rem;
  background-color: rgba(15, 23, 42, 0.6);
  border-bottom: 1px solid var(--border-color);
}

.emails-list {
  flex: 1;
  overflow-y: auto;
}

.email-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color 0.2s;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.email-item:hover {
  background-color: rgba(99, 102, 241, 0.05);
}

.email-item.active {
  background-color: rgba(99, 102, 241, 0.15);
  border-left: 3px solid var(--primary-color);
}

.email-item-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
}

.email-item-info {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.badge {
  font-size: 0.7rem;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-pending {
  background-color: rgba(234, 179, 8, 0.2);
  color: #fbbf24;
}

.badge-success {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--success-color);
}

.badge-error {
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--danger-color);
}

/* Right side preview container */
.email-live-preview {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  background-color: white;
  color: #334155;
  overflow: hidden;
}

.preview-header-fields {
  padding: 1rem;
  background-color: #f1f5f9;
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
}

.preview-header-fields strong {
  color: #475569;
}

.preview-body-container {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
  background-color: white;
}

.preview-html-content {
  font-family: Arial, sans-serif;
  font-size: 14px;
  color: #333333;
}

/* Premium Email Table Styles */
.email-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1.5rem;
  font-size: 13px;
}

.email-table th {
  background-color: #6366f1;
  color: white;
  font-weight: 600;
  text-align: left;
  padding: 10px;
  border: 1px solid #4f46e5;
}

.email-table td {
  padding: 10px;
  border: 1px solid #e2e8f0;
}

.email-table tr:nth-child(even) {
  background-color: #f8fafc;
}

.email-table tr.total-row {
  font-weight: bold;
  background-color: #e2e8f0 !important;
  border-top: 2px solid #94a3b8;
}

/* Actions bar and progress bar */
.send-actions-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

.progress-container {
  flex: 1;
  margin-right: 2rem;
}

.progress-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.progress-bar-bg {
  height: 8px;
  background-color: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--success-color);
  width: 0%;
  transition: width 0.3s ease;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.5);
}