:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --background: #f8fafc;
  --surface: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --shadow: rgba(0, 0, 0, 0.1);
}

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.card {
  background: var(--surface);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 8px var(--shadow);
  margin-bottom: 20px;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  text-align: center;
  min-height: 44px;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

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

.btn-success:hover {
  background: #059669;
  transform: translateY(-2px);
}

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

.btn-danger:hover {
  background: #dc2626;
  transform: translateY(-2px);
}

.btn-large {
  padding: 20px 32px;
  font-size: 18px;
  min-height: 60px;
  width: 100%;
}

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

.btn-secondary:hover {
  background: #475569;
  transform: translateY(-2px);
}

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

.btn-warning:hover {
  background: #d97706;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
  min-height: 36px;
}

.btn-info {
  background: #3b82f6;
  color: white;
}

.btn-info:hover {
  background: #2563eb;
  transform: translateY(-2px);
}

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

.input-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--text);
}

.input-group input,
.input-group select,
.input-group textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.3s ease;
}

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

.grid {
  display: grid;
  gap: 20px;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.text-center {
  text-align: center;
}

.mt-20 {
  margin-top: 20px;
}

.mb-20 {
  margin-bottom: 20px;
}

.hidden {
  display: none !important;
}

.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-light);
}

.alert {
  padding: 16px;
  border-radius: 8px;
  margin-bottom: 20px;
}

.alert-success {
  background: #d1fae5;
  color: #065f46;
  border: 2px solid var(--success);
}

.alert-error {
  background: #fee2e2;
  color: #991b1b;
  border: 2px solid var(--danger);
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
}

.badge-success {
  background: #d1fae5;
  color: #065f46;
}

.badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.badge-programada {
  background: #dbeafe;
  color: #1e40af;
}

.badge-activa {
  background: #d1fae5;
  color: #065f46;
}

.badge-finalizada {
  background: #f3f4f6;
  color: #4b5563;
}

/* Animaciones */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.3s ease;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.pulse {
  animation: pulse 2s infinite;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 12px;
  }

  .card {
    padding: 16px;
  }

  .btn {
    width: 100%;
    margin-bottom: 10px;
  }
}

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background: var(--surface);
  border-radius: 12px;
  padding: 32px;
  max-width: 600px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  animation: fadeIn 0.3s ease;
}

/* Session Setup Styles */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  flex-wrap: wrap;
  gap: 15px;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.students-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.student-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 2px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  background: var(--surface);
}

.student-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.student-card.active {
  border-color: var(--success);
  background: #f0fdf4;
}

.student-check {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: bold;
  color: white;
  transition: all 0.3s ease;
  flex-shrink: 0;
}

.student-check.checked {
  background: var(--success);
  border-color: var(--success);
}

.student-info {
  flex: 1;
  min-width: 0;
}

.student-name {
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.student-rut {
  font-size: 12px;
  color: var(--text-light);
}

.mode-selector {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 12px;
}

.mode-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px;
  border: 3px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.mode-btn:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 8px 16px var(--shadow);
}

.mode-btn.active {
  border-color: var(--primary);
  background: #eef2ff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.mode-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.mode-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.mode-desc {
  font-size: 14px;
  color: var(--text-light);
}

.group-config-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  padding: 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  margin-bottom: 12px;
  background: var(--background);
}

.group-config-item input[type="color"] {
  width: 60px;
  height: 44px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

.header-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.profesor-name {
  font-weight: 600;
  color: var(--text);
  padding: 8px 16px;
  background: var(--background);
  border-radius: 8px;
}

.filters {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 10px 20px;
  border: 2px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text);
}

.filter-btn:hover {
  border-color: var(--primary);
  background: #eef2ff;
}

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

.actividades-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 20px;
}

.actividad-card {
  background: var(--surface);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px var(--shadow);
  border: 2px solid var(--border);
  transition: all 0.3s ease;
  animation: fadeIn 0.3s ease;
}

.actividad-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px var(--shadow);
}

.actividad-card.programada {
  border-left: 4px solid #3b82f6;
}

.actividad-card.activa {
  border-left: 4px solid var(--success);
  background: #f0fdf4;
}

.actividad-card.finalizada {
  border-left: 4px solid var(--text-light);
  opacity: 0.8;
}

.actividad-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
  gap: 12px;
}

.actividad-header h3 {
  font-size: 20px;
  color: var(--text);
  margin: 0;
  flex: 1;
}

.actividad-body {
  margin-bottom: 16px;
}

.actividad-body p {
  margin: 8px 0;
  font-size: 14px;
  color: var(--text);
}

.actividad-body strong {
  color: var(--text);
  font-weight: 600;
}

.actividad-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.actividad-actions .btn {
  flex: 1;
  min-width: 100px;
  padding: 10px 16px;
  font-size: 14px;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}

.empty-state p {
  font-size: 18px;
  margin-bottom: 24px;
}

.error-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--danger);
}

.error-state p {
  font-size: 18px;
  margin-bottom: 24px;
}

/* Login Page Styles */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 20px;
}

.login-card {
  background: var(--surface);
  border-radius: 16px;
  padding: 40px;
  max-width: 450px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: fadeIn 0.5s ease;
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-header h1 {
  font-size: 32px;
  color: var(--text);
  margin-bottom: 8px;
}

.login-header p {
  color: var(--text-light);
  font-size: 16px;
}

.login-form {
  margin-bottom: 24px;
}

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

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--text);
  font-size: 14px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 14px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  transition: all 0.3s ease;
  background: var(--surface);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-control {
  width: 100%;
  padding: 14px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  transition: all 0.3s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn-block {
  width: 100%;
  margin-top: 8px;
}

.error-message {
  background: #fee2e2;
  color: #991b1b;
  padding: 12px;
  border-radius: 8px;
  margin-top: 16px;
  font-size: 14px;
  border: 1px solid #fecaca;
}

.success-message {
  background: #d1fae5;
  color: #065f46;
  padding: 12px;
  border-radius: 8px;
  margin-top: 16px;
  font-size: 14px;
  border: 1px solid #a7f3d0;
}

.login-footer {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.login-footer p {
  margin: 8px 0;
  font-size: 14px;
}

.login-footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

.login-footer a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.session-info {
  background: #dbeafe;
  border: 2px solid #3b82f6;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 24px;
  text-align: center;
}

.session-info p {
  margin: 4px 0;
  color: #1e40af;
}

.student-selection {
  margin-top: 24px;
}

.student-list {
  margin-top: 20px;
}

.student-list p {
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
}

#studentsContainer {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.student-button {
  padding: 16px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.student-button:hover {
  border-color: var(--primary);
  background: #eef2ff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.alert-info {
  background: #dbeafe;
  color: #1e40af;
  padding: 16px;
  border-radius: 8px;
  border: 2px solid #3b82f6;
  text-align: center;
}

.password-recovery {
  margin-top: 24px;
}

.token-display {
  background: #f3f4f6;
  padding: 16px;
  border-radius: 8px;
  margin: 16px 0;
  border: 2px dashed var(--primary);
}

.token-display code {
  font-family: "Courier New", monospace;
  font-size: 18px;
  font-weight: bold;
  color: var(--primary);
  word-break: break-all;
}

@media (max-width: 768px) {
  .login-card {
    padding: 24px;
  }

  .login-header h1 {
    font-size: 24px;
  }

  #studentsContainer {
    grid-template-columns: 1fr;
  }

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

  .header-actions {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .profesor-name {
    text-align: center;
  }

  .actividad-actions {
    flex-direction: column;
  }

  .actividad-actions .btn {
    width: 100%;
  }
}