:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --success: #16a34a;
  --warning: #f59e0b;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.5;
}

/* Header */
header {
  background: var(--gray-900);
  color: #fff;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

header h1 {
  font-size: 20px;
  font-weight: 600;
}

header .subtitle {
  font-size: 13px;
  color: var(--gray-300);
}

.btn-logout {
  margin-left: auto;
  background: none;
  border: 1px solid var(--gray-500);
  color: var(--gray-300);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}

.btn-logout:hover {
  border-color: #fff;
  color: #fff;
}

/* Main */
main {
  max-width: 960px;
  margin: 24px auto;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Cards */
.card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 24px;
}

.card h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--gray-700);
}

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

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: 4px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  min-height: 80px;
  resize: vertical;
}

.form-group .hint {
  font-size: 12px;
  color: var(--gray-500);
  margin-top: 4px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
  font-family: inherit;
}

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

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

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

.btn-secondary {
  background: var(--gray-200);
  color: var(--gray-700);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--gray-300);
}

.btn-success {
  background: var(--success);
  color: #fff;
}
.btn-success:hover:not(:disabled) {
  background: #15803d;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

.btn-group {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

/* File upload */
.file-upload {
  display: flex;
  align-items: center;
  gap: 12px;
}

.file-upload input[type="file"] {
  font-size: 13px;
}

/* Import preview */
.import-preview {
  margin-top: 12px;
  padding: 12px 16px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  font-size: 13px;
}

.import-preview .stat {
  display: inline-block;
  margin-right: 16px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}

.import-preview .stat.valid {
  background: #dcfce7;
  color: #166534;
}
.import-preview .stat.invalid {
  background: #fee2e2;
  color: #991b1b;
}
.import-preview .stat.dup {
  background: #fef3c7;
  color: #92400e;
}

.invalid-list {
  margin-top: 8px;
  font-size: 12px;
  color: var(--gray-500);
}

/* Multi-select checkboxes */
.multi-select {
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  padding: 8px 12px;
  max-height: 160px;
  overflow-y: auto;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-size: 13px;
  cursor: pointer;
}

.checkbox-item input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

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

/* Test SMS block */
.test-sms-block {
  margin-bottom: 16px;
  padding: 12px 16px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 6px;
}

.test-sms-block .form-row {
  margin-bottom: 4px;
}

/* SMS info */
.sms-info {
  font-size: 12px;
  color: var(--gray-500);
  margin-top: 4px;
}

.sms-info .warn {
  color: var(--warning);
  font-weight: 500;
}

/* Campaign list */
.campaigns-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.campaigns-table th {
  text-align: left;
  padding: 8px 12px;
  background: var(--gray-50);
  border-bottom: 2px solid var(--gray-200);
  font-weight: 600;
  color: var(--gray-500);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.campaigns-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
}

.campaigns-table tr:hover {
  background: var(--gray-50);
}

/* Status badges */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-draft { background: var(--gray-100); color: var(--gray-500); }
.badge-queued { background: #fef3c7; color: #92400e; }
.badge-running { background: #dbeafe; color: #1e40af; }
.badge-completed { background: #dcfce7; color: #166534; }
.badge-stopped { background: #fee2e2; color: #991b1b; }
.badge-failed { background: #fecaca; color: #7f1d1d; }

/* Progress bar */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--gray-200);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar .fill {
  height: 100%;
  background: var(--primary);
  border-radius: 4px;
  transition: width 0.3s ease;
}

.progress-bar .fill.complete {
  background: var(--success);
}

.progress-text {
  font-size: 12px;
  color: var(--gray-500);
  margin-top: 2px;
}

/* Filter tabs */
.filter-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.filter-tab {
  padding: 6px 12px;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  background: #fff;
  font-size: 12px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}

.filter-tab:hover {
  background: var(--gray-50);
}

.filter-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* Toast */
#toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: 6px;
  font-size: 13px;
  color: #fff;
  animation: toast-in 0.3s ease;
  max-width: 360px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

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

.toast.fade-out {
  animation: toast-out 0.3s ease forwards;
}

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

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

/* Queue section */
.queue-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.queue-item {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 6px;
}

.queue-item .order {
  font-weight: 600;
  color: var(--gray-500);
  font-size: 14px;
  min-width: 24px;
}

.queue-item .name {
  font-weight: 500;
  font-size: 14px;
}

.queue-item .progress-col {
  min-width: 160px;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 32px;
  color: var(--gray-500);
  font-size: 14px;
}

/* Loading */
.loading {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--gray-300);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-card {
  background: #fff;
  border-radius: var(--radius);
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-700);
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--gray-500);
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
}

.modal-close:hover {
  color: var(--gray-900);
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  font-size: 13px;
}

.modal-error-box {
  padding: 12px 16px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 6px;
  color: #991b1b;
  font-size: 13px;
  margin-bottom: 16px;
}

.modal-error-box .error-label {
  font-weight: 600;
  margin-bottom: 4px;
}

.modal-section {
  margin-bottom: 16px;
}

.modal-section h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 8px;
}

.modal-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.modal-stat {
  text-align: center;
  padding: 10px 8px;
  background: var(--gray-50);
  border-radius: 6px;
}

.modal-stat .num {
  font-size: 20px;
  font-weight: 700;
  color: var(--gray-900);
}

.modal-stat .label {
  font-size: 11px;
  color: var(--gray-500);
  margin-top: 2px;
}

.modal-stat.sent .num { color: var(--success); }
.modal-stat.failed .num { color: var(--danger); }
.modal-stat.pending .num { color: var(--primary); }

.modal-log {
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
}

.modal-log table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.modal-log th {
  text-align: left;
  padding: 6px 10px;
  background: var(--gray-50);
  font-weight: 600;
  color: var(--gray-500);
  position: sticky;
  top: 0;
}

.modal-log td {
  padding: 5px 10px;
  border-top: 1px solid var(--gray-100);
  vertical-align: top;
}

.modal-log .event-success { color: var(--success); }
.modal-log .event-fail { color: var(--danger); }
.modal-log .event-info { color: var(--gray-500); }

.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--gray-200);
}

/* Responsive */
@media (max-width: 640px) {
  .form-row {
    grid-template-columns: 1fr;
  }
  .queue-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}