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

:root {
  --primary: #1e3a5f;
  --primary-light: #2c5282;
  --secondary: #4299e1;
  --success: #38a169;
  --danger: #e53e3e;
  --warning: #dd6b20;
  --gray-50: #f7fafc;
  --gray-100: #edf2f7;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e0;
  --gray-400: #a0aec0;
  --gray-500: #718096;
  --gray-600: #4a5568;
  --gray-700: #2d3748;
  --gray-800: #1a202c;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --radius: 8px;
  --radius-lg: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
}

/* Утилиты */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

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

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

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

.btn-secondary:hover {
  background: #3182ce;
}

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

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

.btn-outline {
  background: transparent;
  border: 1px solid var(--gray-300);
  color: var(--gray-700);
}

.btn-outline:hover {
  background: var(--gray-100);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

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

.card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 20px;
}

.card-header {
  padding-bottom: 15px;
  border-bottom: 1px solid var(--gray-200);
  margin-bottom: 15px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-800);
}

/* Страница входа */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 20px;
}

.login-card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 40px;
  width: 100%;
  max-width: 420px;
}

.login-logo {
  text-align: center;
  margin-bottom: 30px;
}

.login-logo h1 {
  font-size: 28px;
  color: var(--primary);
  margin-bottom: 8px;
}

.login-logo p {
  color: var(--gray-500);
  font-size: 14px;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  font-size: 14px;
  color: var(--gray-700);
}

.form-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 15px;
  transition: border-color 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
}

.form-input::placeholder {
  color: var(--gray-400);
}

.input-with-icon {
  position: relative;
}

.input-toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-400);
  font-size: 18px;
}

.login-error {
  background: #fff5f5;
  color: var(--danger);
  padding: 12px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 14px;
  display: none;
}

.login-error.show {
  display: block;
}

.forgot-password {
  text-align: right;
  margin-top: -12px;
  margin-bottom: 20px;
}

.forgot-password a {
  color: var(--secondary);
  font-size: 13px;
  text-decoration: none;
}

/* Боковое меню */
.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: white;
  border-right: 1px solid var(--gray-200);
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  transition: transform 0.3s;
  z-index: 100;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--gray-200);
}

.sidebar-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}

.sidebar-user {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px solid var(--gray-200);
}

.sidebar-user-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--gray-800);
}

.sidebar-user-role {
  font-size: 12px;
  color: var(--gray-500);
  margin-top: 2px;
}

.sidebar-nav {
  padding: 15px 0;
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  color: var(--gray-600);
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
}

.sidebar-nav-item:hover {
  background: var(--gray-50);
  color: var(--primary);
}

.sidebar-nav-item.active {
  background: var(--gray-50);
  color: var(--primary);
  border-right: 3px solid var(--primary);
}

.sidebar-nav-icon {
  width: 20px;
  text-align: center;
  font-size: 18px;
}

.main-content {
  flex: 1;
  margin-left: 260px;
  padding: 30px;
  min-height: 100vh;
}

.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

.main-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--gray-800);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.notification-btn {
  position: relative;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--gray-500);
}

.notification-badge {
  position: absolute;
  top: -5px;
  right: -5px;
  background: var(--danger);
  color: white;
  font-size: 10px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logout-btn {
  background: none;
  border: 1px solid var(--gray-300);
  padding: 8px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--gray-600);
  font-size: 14px;
}

/* Дашборд сотрудника */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow);
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 5px;
}

.stat-label {
  font-size: 14px;
  color: var(--gray-500);
}

.stat-card.success .stat-value {
  color: var(--success);
}

.stat-card.danger .stat-value {
  color: var(--danger);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.section-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-800);
}

/* Карточки курсов */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.course-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.course-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.course-cover {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.course-content {
  padding: 20px;
}

.course-category {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
  color: white;
}

.course-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.course-description {
  font-size: 14px;
  color: var(--gray-500);
  margin-bottom: 15px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-meta {
  display: flex;
  gap: 15px;
  font-size: 13px;
  color: var(--gray-500);
  margin-bottom: 15px;
}

.course-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.course-progress {
  margin-bottom: 15px;
}

.progress-bar {
  background: var(--gray-200);
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.3s;
}

.progress-fill.not-started {
  background: var(--gray-400);
}

.progress-fill.in-progress {
  background: var(--secondary);
}

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

.progress-fill.overdue {
  background: var(--danger);
}

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

.course-status {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.course-status.not-started {
  background: var(--gray-200);
  color: var(--gray-600);
}

.course-status.in-progress {
  background: #bee3f8;
  color: var(--primary);
}

.course-status.completed {
  background: #c6f6d5;
  color: var(--success);
}

.course-status.overdue {
  background: #fed7d7;
  color: var(--danger);
}

/* Фильтры */
.filters-bar {
  display: flex;
  gap: 15px;
  margin-bottom: 25px;
  flex-wrap: wrap;
}

.search-input {
  flex: 1;
  min-width: 250px;
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
}

.filter-select {
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
  background: white;
  cursor: pointer;
}

/* Страница курса */
.course-detail-header {
  background: white;
  border-radius: var(--radius-lg);
  padding: 30px;
  margin-bottom: 30px;
  box-shadow: var(--shadow);
}

.course-detail-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 30px;
}

.course-detail-info h1 {
  font-size: 28px;
  color: var(--gray-800);
  margin-bottom: 15px;
}

.course-detail-meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.course-detail-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--gray-600);
}

.course-detail-description {
  color: var(--gray-600);
  line-height: 1.7;
}

.course-sidebar {
  background: var(--gray-50);
  border-radius: var(--radius);
  padding: 20px;
}

.course-sidebar-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 15px;
}

.course-modules {
  list-style: none;
}

.module-item {
  margin-bottom: 20px;
}

.module-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--gray-200);
}

.lesson-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s;
  margin-bottom: 5px;
  font-size: 14px;
}

.lesson-item:hover {
  background: white;
}

.lesson-item.active {
  background: white;
  border-left: 3px solid var(--primary);
}

.lesson-item.completed {
  color: var(--success);
}

.lesson-icon {
  font-size: 16px;
}

/* Урок */
.lesson-viewer {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 30px;
  height: calc(100vh - 150px);
}

.lesson-content {
  background: white;
  border-radius: var(--radius-lg);
  padding: 30px;
  overflow-y: auto;
}

.lesson-content h2 {
  font-size: 24px;
  margin-bottom: 20px;
  color: var(--gray-800);
}

.lesson-content video {
  width: 100%;
  border-radius: var(--radius);
  margin: 20px 0;
}

.lesson-content iframe {
  width: 100%;
  aspect-ratio: 16/9;
  border: none;
  border-radius: var(--radius);
  margin: 20px 0;
}

.lesson-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 30px;
  padding-top: 30px;
  border-top: 1px solid var(--gray-200);
}

/* Тестирование */
.quiz-container {
  max-width: 800px;
  margin: 0 auto;
}

.quiz-header {
  background: white;
  padding: 20px;
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.quiz-timer {
  font-size: 24px;
  font-weight: 700;
  color: var(--danger);
}

.quiz-question {
  background: white;
  padding: 30px;
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
}

.question-text {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--gray-800);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
}

.quiz-option:hover {
  border-color: var(--secondary);
  background: #f0f7ff;
}

.quiz-option.selected {
  border-color: var(--primary);
  background: #ebf4ff;
}

.quiz-option input {
  width: 20px;
  height: 20px;
}

.quiz-result {
  text-align: center;
  padding: 40px;
  background: white;
  border-radius: var(--radius-lg);
}

.result-score {
  font-size: 64px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
}

.result-status {
  font-size: 20px;
  margin-bottom: 20px;
}

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

.result-status.failed {
  color: var(--danger);
}

/* Таблицы */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.data-table th,
.data-table td {
  padding: 14px;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.data-table th {
  background: var(--gray-50);
  font-weight: 600;
  font-size: 13px;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.data-table tr:last-child td {
  border-bottom: none;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.badge-success {
  background: #c6f6d5;
  color: var(--success);
}

.badge-warning {
  background: #feebc8;
  color: var(--warning);
}

.badge-danger {
  background: #fed7d7;
  color: var(--danger);
}

.badge-info {
  background: #bee3f8;
  color: var(--primary);
}

.badge-secondary {
  background: var(--gray-200);
  color: var(--gray-600);
}

/* Уведомления */
.notifications-panel {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  height: 100vh;
  background: white;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  transition: right 0.3s;
  padding: 20px;
  overflow-y: auto;
}

.notifications-panel.open {
  right: 0;
}

.notification-item {
  padding: 15px;
  border-radius: var(--radius);
  margin-bottom: 10px;
  background: var(--gray-50);
  cursor: pointer;
  transition: background 0.2s;
}

.notification-item:hover {
  background: var(--gray-100);
}

.notification-item.unread {
  background: #ebf4ff;
  border-left: 3px solid var(--secondary);
}

.notification-title {
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 5px;
}

.notification-message {
  font-size: 13px;
  color: var(--gray-600);
}

.notification-time {
  font-size: 11px;
  color: var(--gray-400);
  margin-top: 8px;
}

/* Сертификат */
.certificate {
  background: white;
  border: 10px solid var(--primary);
  padding: 40px;
  text-align: center;
  border-radius: var(--radius);
  position: relative;
}

.certificate-logo {
  font-size: 48px;
  color: var(--primary);
  margin-bottom: 20px;
}

.certificate-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
}

.certificate-subtitle {
  font-size: 18px;
  color: var(--gray-600);
  margin-bottom: 30px;
}

.certificate-name {
  font-size: 32px;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 20px;
  border-bottom: 2px solid var(--gray-300);
  display: inline-block;
  padding: 0 40px 10px;
}

.certificate-course {
  font-size: 20px;
  color: var(--gray-700);
  margin-bottom: 30px;
}

.certificate-date {
  font-size: 14px;
  color: var(--gray-500);
}

.certificate-number {
  position: absolute;
  bottom: 20px;
  right: 40px;
  font-size: 12px;
  color: var(--gray-400);
}

/* Адаптивность */
@media (max-width: 1024px) {
  .main-content {
    margin-left: 0;
    padding: 20px;
  }

  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .course-detail-grid {
    grid-template-columns: 1fr;
  }

  .lesson-viewer {
    grid-template-columns: 1fr;
    height: auto;
  }

  .mobile-menu-btn {
    display: block;
  }
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .courses-grid {
    grid-template-columns: 1fr;
  }

  .filters-bar {
    flex-direction: column;
  }

  .search-input {
    min-width: 100%;
  }

  .main-header {
    flex-direction: column;
    gap: 15px;
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .notifications-panel {
    width: 100%;
    right: -100%;
  }
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--gray-700);
}

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

/* Состояние загрузки */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Пустое состояние */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--gray-500);
}

.empty-state-icon {
  font-size: 64px;
  margin-bottom: 20px;
  opacity: 0.5;
}

.empty-state-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 10px;
}

.empty-state-text {
  font-size: 14px;
}