:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #232733;
  --border: #2d3140;
  --text: #e4e6f0;
  --text-muted: #8b8fa3;
  --primary: #6c5ce7;
  --primary-hover: #7c6ff7;
  --success: #00b894;
  --warning: #fdcb6e;
  --danger: #e17055;
  --accent: #74b9ff;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── Login ── */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow);
}

.login-card h1 {
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--primary);
}

.login-card p {
  color: var(--text-muted);
  margin-bottom: 24px;
  font-size: 14px;
}

/* ── Layout ── */
.app-layout {
  display: none;
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 240px;
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 20px 0;
  z-index: 100;
  overflow-y: auto;
}

.sidebar-logo {
  padding: 0 20px 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

.sidebar-logo h2 {
  font-size: 18px;
  color: var(--primary);
}

.sidebar-logo span {
  font-size: 12px;
  color: var(--text-muted);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 14px;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background: var(--surface2);
  color: var(--text);
}

.nav-item.active {
  background: var(--surface2);
  color: var(--primary);
  border-left-color: var(--primary);
}

.nav-section {
  padding: 10px 20px 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-top: 8px;
}

.main-content {
  margin-left: 240px;
  padding: 24px;
  min-height: 100vh;
}

.page { display: none; }
.page.active { display: block; }

/* ── Components ── */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.page-header h1 {
  font-size: 24px;
  font-weight: 600;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

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

.card-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 500;
}

input, select, textarea {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.2s;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
}

textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

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

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

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

.btn-success:hover {
  opacity: 0.9;
}

.btn-warning {
  background: var(--warning);
  color: #333;
}

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

.btn-danger:hover {
  opacity: 0.9;
}

.btn-outline {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

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

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ── Grid ── */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* ── Email Preview ── */
.email-preview {
  background: #fff;
  color: #333;
  border-radius: 8px;
  padding: 32px;
  max-width: 600px;
  margin: 0 auto;
  font-family: Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.email-preview-dark {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-size: 14px;
  line-height: 1.7;
  max-height: 500px;
  overflow-y: auto;
}

.subject-line {
  font-size: 18px;
  font-weight: 600;
  padding: 12px 16px;
  background: var(--surface2);
  border-radius: 6px;
  margin-bottom: 16px;
  border-left: 3px solid var(--primary);
}

/* ── Status Badge ── */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-draft { background: var(--surface2); color: var(--text-muted); }
.badge-pushed { background: rgba(0,184,148,0.15); color: var(--success); }
.badge-sent { background: rgba(108,92,231,0.15); color: var(--primary); }

/* ── Table ── */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

tr:hover {
  background: var(--surface2);
}

/* ── Stats ── */
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ── Loading ── */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 40px;
  color: var(--text-muted);
}

/* ── Toast ── */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 14px;
  animation: slideIn 0.3s ease;
  box-shadow: var(--shadow);
}

.toast-success { background: var(--success); color: white; }
.toast-error { background: var(--danger); color: white; }
.toast-info { background: var(--primary); color: white; }

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

/* ── Workflow Steps ── */
.workflow-step {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
  position: relative;
}

.workflow-step-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  font-size: 13px;
  font-weight: 600;
}

.step-delay {
  font-size: 12px;
  color: var(--accent);
  font-weight: 500;
}

/* ── Sample Email Card ── */
.sample-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s;
}

.sample-card:hover {
  border-color: var(--primary);
}

.sample-card.selected {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(108,92,231,0.3);
}

.sample-card h4 {
  font-size: 14px;
  margin-bottom: 4px;
}

.sample-card p {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar { width: 60px; }
  .sidebar .nav-item span, .sidebar .nav-section, .sidebar-logo span { display: none; }
  .sidebar-logo h2 { font-size: 14px; }
  .main-content { margin-left: 60px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ── Tab Navigation ── */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.tab {
  padding: 10px 20px;
  font-size: 14px;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.tab:hover { color: var(--text); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }