:root {
  --primary: #0066ff;
  --primary-dark: #0052cc;
  --secondary: #00c9b7;
  --dark: #1a1a2e;
  --light: #f8f9fa;
  --gray: #6c757d;
  --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-container {
  width: 100%;
  max-width: 1400px;
  min-height: 90vh;
}

/* Header del Login */
.login-header {
  margin-bottom: 30px;
}

.back-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.back-home:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateX(-5px);
}

/* Contenido Principal */
.login-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

/* Tarjeta de Login */
.login-card {
  background: white;
  padding: 50px 40px;
  border-radius: 20px;
  box-shadow: var(--shadow);
  text-align: center;
}

.login-logo img {
  height: 80px;
  margin-bottom: 20px;
}

.login-logo h1 {
  font-family: 'Montserrat', sans-serif;
  font-size: 2rem;
  color: var(--dark);
  margin-bottom: 10px;
}

.login-logo p {
  color: var(--gray);
  margin-bottom: 30px;
}

/* Formulario */
.login-form {
  text-align: left;
}

.form-group {
  margin-bottom: 25px;
}

.input-with-icon {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-icon i {
  position: absolute;
  left: 20px;
  color: var(--gray);
  z-index: 2;
}

.input-with-icon input {
  width: 100%;
  padding: 15px 20px 15px 50px;
  border: 2px solid #e9ecef;
  border-radius: 12px;
  font-size: 16px;
  font-family: 'Poppins', sans-serif;
  transition: var(--transition);
  background: #f8f9fa;
}

.input-with-icon input:focus {
  outline: none;
  border-color: var(--primary);
  background: white;
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.toggle-password {
  position: absolute;
  right: 15px;
  background: none;
  border: none;
  color: var(--gray);
  cursor: pointer;
  padding: 5px;
  transition: var(--transition);
}

.toggle-password:hover {
  color: var(--primary);
}

/* Botón de Login */
.login-btn {
  width: 100%;
  padding: 15px;
  background: var(--gradient);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 102, 255, 0.3);
}

.btn-loading {
  display: none;
}

.login-btn.loading .btn-text {
  display: none;
}

.login-btn.loading .btn-loading {
  display: block;
}

/* Mensaje de Resultado */
.result-message {
  margin-top: 15px;
  padding: 12px;
  border-radius: 8px;
  text-align: center;
  font-weight: 500;
}

.result-message.success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.result-message.error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* Ayuda del Login */
.login-help {
  margin-top: 25px;
  padding-top: 20px;
  border-top: 1px solid #e9ecef;
}

.login-help a {
  color: var(--primary);
  font-weight: 500;
}

.login-help a:hover {
  text-decoration: underline;
}

/* Características */
.login-features {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.feature {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  padding: 30px;
  border-radius: 15px;
  color: white;
  text-align: center;
  transition: var(--transition);
}

.feature:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.15);
}

.feature i {
  font-size: 2.5rem;
  margin-bottom: 15px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.feature h3 {
  font-family: 'Montserrat', sans-serif;
  margin-bottom: 10px;
  font-size: 1.3rem;
}

.feature p {
  opacity: 0.9;
  font-size: 0.95rem;
}

/* Contenedor de Rutinas */
.rutina-container {
  background: white;
  min-height: 100vh;
  padding: 20px;
}

.rutina-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid #e9ecef;
}

.user-welcome h2 {
  color: var(--dark);
  margin-bottom: 5px;
}

.user-welcome p {
  color: var(--gray);
}

.logout-btn {
  background: #dc3545;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.logout-btn:hover {
  background: #c82333;
  transform: translateY(-2px);
}

/* PDF Viewer */
.pdf-section {
  margin-bottom: 30px;
}

.pdf-section h3 {
  color: var(--dark);
  margin-bottom: 15px;
}

.pdf-viewer {
  width: 100%;
  height: 500px;
  border: 1px solid #e9ecef;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

/* Botón Analizar Postura */
.postura-btn {
  background: var(--gradient);
  color: white;
  border: none;
  padding: 15px 25px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 20px auto;
  font-weight: 600;
  transition: var(--transition);
}

.postura-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 102, 255, 0.3);
}

/* Botones de Rutina */
.rutina-buttons {
  margin-bottom: 30px;
}

.rutina-buttons h3 {
  color: var(--dark);
  margin-bottom: 20px;
  text-align: center;
}

.rutina-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
}

.rutina-btn {
  background: rgba(152, 255, 213, 0.4);
  border: 2px solid rgba(173, 216, 230, 0.5); /* Azul claro transparente */
  padding: 20px;
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--dark);
  backdrop-filter: blur(5px); /* Efecto vidrio opcional */

}

.rutina-btn:hover {
  background: rgba(240, 248, 255, 0.7);
  transform: translateY(-2px);
}

.rutina-btn i {
  font-size: 1.5rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Videos */
.videos-container {
  margin: 30px 0;
}

/* Botones de Acción */
.resumen-actions {
  display: flex;
  gap: 15px;
  justify-content: center;
  margin: 20px 0;
}

.resumen-btn, .download-btn {
  padding: 12px 25px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  transition: var(--transition);
}

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

.download-btn {
  background: #28a745;
  color: white;
}

.resumen-btn:hover, .download-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

/* Contenido del Resumen */
.resumen-content {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 12px;
  margin-top: 20px;
  border-left: 4px solid var(--primary);
}

/* Chat Float */
.chat-float {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 1000;
  text-align: center;
}

.chat-btn {
  width: 60px;
  height: 60px;
  background: var(--gradient);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
  transition: var(--transition);
  text-decoration: none;
}

.chat-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(0, 102, 255, 0.4);
}

.chat-label {
  display: block;
  margin-top: 5px;
  font-size: 0.8rem;
  color: var(--dark);
  font-weight: 500;
}

/* Responsive */
@media (max-width: 768px) {
  .login-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .login-card {
    padding: 30px 20px;
  }
  
  .rutina-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .resumen-actions {
    flex-direction: column;
  }
  
  .rutina-header {
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  body {
    padding: 10px;
  }
  
  .login-card {
    padding: 25px 15px;
  }
  
  .rutina-grid {
    grid-template-columns: 1fr;
  }
  
  .feature {
    padding: 20px;
  }
}